Scope of Work and Technical Specification - UP Baguio

Scope of Work andTechnical SpecificationforExtension of Kolehiyo ng Agham BuildingGovernment Center Road, Baguio CityPrepared byArch. Aristotle J. GoPRC: 19205

01 GENERAL REQUIREMENTS1100. GENERAL CONTRACTORSThe drawing and specifications are intended to explain each mutually and anything shown orcalled for in one and not in the other shall be executed as part of the contract as though bothare shown and specified.The Contractor shall be responsible to check all the numbers and units as may be indicated onthe drawings or specifications and shall supply and install the actual required units called for.The Contractor shall take precautionary measures for the adjacent properties from injury,damage or loss arising in the connection with this contract. He shall be responsible for alldamages to persons or property which may occur in connection with the execution of the work.1200. INSPECTION SERVICESREFITTING AND CHECKINGImmediately before building is occupied, the Contractor shall examine all doors and othermovable part of all case to see that all are in perfect operating condition. Before and afterrefitting, all edges of doors shall be sealed with approved water resistant materials.1300. CONSTRUCTION SCAFFOLDING AND PLATFORMSFALSEWORK AND FORMWORKSCOPEThis work covers the supply, construction, erection and removal of falsework and formwork.Falsework shall provide the necessary rigidity, support the loads imposed and produce finishedstructure alignment, dimensions and grades indicated on the Drawings or as ordered by UPBaguio. Formwork shall be of sufficient strength with all necessary bracing, fasteners, etc.and in conformity with the specified requirements of applicable building code requirements forconcrete framework, and National Structural Code of the Philippines.MATERIAL REQUIREMENTTimber, lumber and plywood to be used for falsework and formwork shall be sound and shallcomply with the requirements of these specifications. Use forms where a smooth form finishis required. Lumber shall be square-edged or tongue-and-groove boards, free or raised grain,knotholes and the other surfaces defects. Steel when used shall conform to the requirements ofthe ASTM A36. Steel form surfaces shall not contain irregularities, dents, or sags. Forms shallbe wood, plywood, or steel. Wood forms for surfaces exposed to view in the finished structureand requiring a smooth form finish, shall be plywood.For unexposed surfaces, undressed square-edge lumber may be used. Forms for surfacesrequiring special finishes shall be plywood, or shall be lined with plywood, a non-absorptive,

hard-pressed fiberboard, absorptive type lining or other suitable material. Plywood, otherthan for lining, shall be concrete-form plywood free of raised grain, torn surfaces, wornedges,patches, or other surface defects, which would impair the texture of the concrete surface.Surfaces of steel forms shall be free from irregularities, dents, and sags.CONSTRUCTION REQUIREMENTSThe materials used in the falsework shall be of the quantity and quality necessary to withstandthe stresses imposed. The workmanship used in the falsework shall be of such quality that thefalsework will support the loads imposed on it without excessive settlement. Suitable jacks orwedges shall be used in connection with the falsework to set the forms to their required gradeand to take up any excessive settlement in the falsework either before or during the placementof the concrete.Should unanticipated events occur, including settlements that deviate more than ±20 mm,which in the opinion of the Contractor would prevent obtaining a structure conforming to therequirements of the specification, the placement of the concrete shall be discontinued untilcorrective measures satisfactory to the UP Baguio are provided. In the event satisfactorymeasures are not provided prior to initial set of the concrete in the affected area, the placing ofconcrete shall be discontinued at a location determined by UP Baguio.All unacceptable concrete shall be removed. Forms shall be mortar and watertight, true to thedimensions, lines and grades of the structure and with the sufficient strength, rigidity, shapeand surface smoothness as to leave the finished works true to the dimensions shown on thedrawings or required by UP Baguio and with the surface finish as specified. The inside surfacesof forms shall be cleaned of all dirt, mortar and foreign material. Forms, which will subsequentlybe removed, shall be thoroughly coated with a release agent or coating prior to its use. Therelease agent shall be commercial quality form oil or other approved coating which will permitthe ready release of the forms and will not discolor the concrete.Portions of concrete structures with surface undulations in excess of the limits herein statedmay be rejected by the UP Baguio. Form fasteners consisting of forms bolts, clamps orother devices shall be used as necessary to prevent spreading of the forms during concreteplacement. The use of ties consisting of twisted wire loops to hold the forms in position willnot be permitted. All formwork shall be provided with adequate clean-out openings to permitinspection and easy cleaning after all reinforcement has been placed. Where forms forcontinuous surfaces are placed in successive units, the forms shall be fitted over the completedsurface to obtain accurate alignment of the surface and to prevent leakage of mortar. Panelforms shall be constructed so that they can be removed without damaging the concrete. Allexposed joints, edges, and external corners shall be chamfered a minimum of 20 mm unlessspecified otherwise herein. Forms for heavy girders and similar members shall be constructedwith a proper camber as indicated.• Coating: Before placing the concrete, the contact surface of forms shall be coated with a nonstainingmineral oil or suitable non-staining form coating compound or shall be given two coats

of nitrocellulose lacquer, except as specified otherwise. Mineral oil shall not be used on formsfor surfaces, which are to be painted. For surfaces not exposed to view in the finished structure,sheathing may be wetted thoroughly with clean water. All excess coating shall be removed bywiping with cloths. Reused forms shall have the contact surfaces cleaned thoroughly. Thosethat have been coated shall be given an additional application of the coating. Plaster wastemolds shall be sized with two coats of the thin shellac or lacquer and coated with soft or thinnednonstaining grease.• Tolerance and Variations: The Contractor shall set and maintain concrete forms to ensurethat, after removal of the forms and prior to patching and finishing, no portion of the concretework will exceed any of the tolerances specified. Variations in floor levels shall be measuredbefore removal of supporting shores. The Contractor shall be responsible for variations due todeflection, when the latter results from concrete quality or curing other than that which has beenspecified. The tolerances specified shall not exceed by any portion of any concrete surfaces;the specified variation for one element of the structure will not be applicable when it will permitanother element of the structure to exceed its allowable variations. Except as otherwisespecified herein, tolerances shall conform to ACI 347.Removal of Falsework and Formwork Unless otherwise shown on the drawings, permitted byUP Baguio, falsework supporting any span of structures shall not be released before fourteen(14) days after the last concrete has been placed on the span and adjacent portions of eachadjoining span for the length equal to at least half the length of the span where falsework isto release. Falsework supporting deck overhangs and deck slabs between girders shall notbe released until seven (7) days after the deck concrete has been placed. In addition to theabove requirements, no falsework shall be released until the supported concrete has attaineda compressive strength of at least eighty (80%) percent of the required 28-day strength.Falsework and formwork shall not be removed without the permission of UP Baguio, and suchpermission shall not relieve the Contractor of the responsibility for the safety of the work.Blocks and bracing shall be removed at the time the forms are removed and in no case shallany portion of the wood forms be left in the concrete. Falsework removal for continuousstructures shall be as directed by UP Baguio or shall be temporarily supported such that thestructure is gradually subjected to its working stresses. Falsework shall not be released in anyspan until the strength specified herein. When concrete strength tests are used for removalof forms and supports, such removal shall be used as a minimum: Min. Time Min.% StrengthCentering under girders 14 days 80% and beams Sides of beams and all 1 day 70% verticalsurfaces Floor Slabs 14 days 80% All debris and refuse resulting from work shall be removedand the site left in a neat and presentable condition.MEASUREMENT AND PAYMENTNo separate measurement for payment will be made for this item. The entire cost thereof shallbe included in the various pay items in the Bill of Quantities.02 SITE CONSTRUCTION

2100. SUBSURFACE INVESTIGATIONEXAMINATION OF SITEThe builder/contractor shall visit the site of the work and examine the premises so as to fullyunderstand all the existing conditions relative to the work. No increase in cost of extension onperformance time will be considered for failure to know its condition.PROTECTION OF STRUCTURES AND PROPERTYFence at all sides of the property shall be constructed by the contractor.Provide proper enclosure within the perimeter to insure safety and prevent possible damage onadjacent properties.DISPOSAL OF MATERIALSAll surplus materials shall become the property of the owner, unless otherwise the surplusmaterials are given by the owner to the contractor and shall be removed promptly from thepremises.DEBRISRemove as it accumulates, debris resulting of the demolition such as wood and other debrismay not be burned on the site.CLEANINGUpon completion of work, remove all barricades, tools, materials, plants, apparatus, and debris.Leave premises clean, neat and orderly.2200. EARTH WORKSTRUCTURAL EXCAVATION, FILL AND BACKFILL, DRAINAGE, FOUNDATION, AND SOILPOISONING:GRAVEL BED – 6”thick compacted on bottom of foundation and/ or footing trenches.Drain water in trench as may be directed during pouring time.Excavation & Grading – minimum depth of excavation from natural grade line, 1.20mts. refer tostructural drawings.Soil Poisoning – apply soil treatment to all areas enclosed by the building perimeter againstground pests like subterranean termites and others. Chemicals shall be approved brand by theArchitect/Owner and shall be applied according to manufacturer’s specifications.STRUCTURAL EXCAVATION, FILL AND BACKFILLSCOPE

In accordance with the specifications contained herein and as shown on the drawings andotherwise directed, the Contractor shall perform all the required structural excavation, fill andbackfill for the foundation of structures. It also includes trench excavation and backfill forsewerage, drainage and water pipes and also the proper disposal of materials excavated.MATERIALSStructural Excavation No classification will be made of the materials excavated. The Contractorshall determine his unit price bid for structural excavation based on unclassified materialregardless of the nature of the materials encountered and excavated.Structural Filla. Sand and Gravel FillSand and Gravel fill shall be the same as the sand and gravel base for concrete slabs andfooting and where may be required elsewhere which shall consist of river sand and gravelapproved by the UP Baguio. The composite material shall be free from vegetable matter andlumps or balls of clay, and shall be uniformly graded from coarse to fine in accordance with thegrading requirements shown below. It shall conform to the following gradation requirements:Material Sieve Designation(Square Mesh Sieves)50.0 mm (2")25.4 mm (1")9.5 mm (3/8")4.76 mm (No.4)2.08 mm (No. 1 0)0.42 mm (No. 40)0.074 mm (No. 200)b. Structural Earth FillPercentage byWeight Passing10055-8535-6025-5020-408-202-8Structural earth fill shall consist of suitable materials obtained from grading excavation or fromborrow areas approved by the UP Baguio. Special Foundation, if any The UP Baguio has theoption to use one or both of the following materials for special foundations, whether or notshown on the drawings:

a. Lean ConcreteThe strength of lean concrete shall be 13.79MPa. It shall be designated by the UP Baguio.b. Selected MaterialsSelected materials shall consist of compactable material, that when compacted will attain therequired bearing capacity. The material could be a combination of earth and rock particles notgreater than 8 em. or sandy clay, gravelly clay, or shale, all approved by the UP Baguio.Structural BackfillBackfill for Structures Other Than Pipes - Material for backfill shall consist of compactable andapproved material taken from grading and structural foundation excavations. Any additionalmaterial needed shall be obtained from borrow areas proposed by the Contractor and approvedby the UP Baguio. Backfill for Sewerage and Drainage Pipes - The layer of backfill materialsimmediately above, up to 60 em. from the top of pipe, and on the sides of the pipe shallconsist of selected material consisting of clay soil free from stone particles, roots, debris. Theupper layer shall consist of compactable materials taken from pipe trench and other structuralfoundation excavation.Backfill for Water Supply Pipes - Backfill for water supply pipes shall consist of compactablematerials taken from trench excavation and approved by the UP Baguio.CONSTRUCTION WORKSExcavationa. GeneralThe Contractor shall notify the UP Baguio sufficiently in advance at the beginning of anyexcavation so that cross-sectional measurements will be taken on the undisturbed ground orgraded surface.All Excavation shall be carried out according to the lines, slopes and grades shown on thedrawings which shall be the basis for claim of additional compensation over and above thecontract unit prices of items affected by such change. In case an increase or decrease inquantities occur as a result of changes made by the UP Baguio to such lines, slopes, andgrades, the provisions of GCC-Variation Orders shall be applied. After each excavation iscompleted or where replacement of unsuitable material below required foundation grade hasbeen undertaken, the Contractor shall notify the UP Baguio so that proper inspection andconfirmatory test on the bearing capacity of the foundation material can be made. In no caseshall concrete, sewer, drainage or water supply pipe be placed therein until written approvalhas been given by the UP Baguio. Over-excavation performed by the Contractor due to hiscarelessness shall be filled with the suitable material approved by UP Baguio, at no additionalcost to UP Baguio.b. Structural Excavation, Structure other Than Pipes

The Contractor shall excavate the foundations to the specified side slopes and depths shownon the drawings, after which the UP Baguio will conduct tests on the underlying material belowfoundation grade to determine the actual bearing capacity at such depth. If the required bearingcapacity is not attained, the UP Baguio shall instruct the Contractor to excavate further downuntil, in the opinion of the UP Baguio, bearing capacity is adequate to sustain the applied loadon the foundation. Compliance to such instruction shall not entitle the Contractor fal excavated.For purposes of measurement, the applicable paylines for the excavation under this conditionor situation shall be as shown on the drawings showing paylines for excavation and specialfoundation materials.c. Drainage and Sewerage PipesThe width of trench excavation for drainage and sewerage pipes shall be as indicated on thedrawings. All trench bottoms shall be excavated to the foundation grade whether foundationmaterial is rock or earth.d. Water Supply PipesTrenches for main or feeder lines shall be excavated to a depth of 0.25 meter on open groundand 0.60 meter under roadways and parking areas, both depths measured from the gradedsurface. Service pipes shall be buried to a depth of 0.15 meter below grade line.Structural Foundation FillNo fill materials shall be placed in any part of the fill foundation unless the foundations havebeen inspected and approved by the UP Baguio. Fill materials shall be placed and spread inlayer covering the entire length and breadth of the section under construction, and compactedthoroughly to the desired compaction to be determined by the UP Baguio. No succeeding layershall be placed until the previous layer has been tested and approved of its compaction by theUP Baguio.Special FoundationsIf unsuitable material is encountered or if the foundation material is unsuitable such that therequired bearing capacity of the foundation is not attained at the required elevation, furtherexcavation shall be performed by the Contractor Excavated materials below foundation gradeshall be replaced at the direction of the UP Baguio, either by lean concrete or by selectedmaterials as mentioned in Selected materials shall be placed in 15-cm. required bearingcapacity.Backfill1. Structures, Other Than Pipeslayers and compacted to the Excavated areas around structures shall be backfilled withapproved materials in horizontal layers, each not exceeding 15cm. (6") in loose volumethickness. Each layer shall either be moistened or dried as directed and thoroughly tamped withhand tampers having a tamping area of not less than 160 cm2 and weighing not less than 20kg. The last layer shall be brought up to the level of the adjoining finished grade surface in aneat and presentable appearance. In no case shall backfill be placed around structures unless

fourteen (14) days have elapsed after placement of concrete.2. Drainage and Sewerage PipesAfter the pipes have been installed and grouted joints sufficiently cured, but in no case lessthan seven (7) days allowed for curing as specified in NSCP and the whole pipeline inspected,backfill materials specified herein shall be placed in layers as directed, each layer either dried ormoistened as directed and thoroughly tamped. The backfill shall be brought up evenly on bothsides of the pipe up to the top of the pipe and finally up to the finished grade surface.3. Water Supply PipesAfter the pipeline has been installed and tested it shall be backfilled in layers as directed andcompacted to the satisfaction of the UP Baguio.MEASUREMENT AND PAYMENTStructural ExcavationMeasurement for payment for structural excavation performed by the Contractor for structures(except drainage, sewerage and water supply pipes, and appurtenances of which cost ofexcavation and backfill is included in the cost of installed pipe and constructed appurtenances)will be based on the number of cubic meters of materials excavated. For purpose of payment,all authorized excavation below foundation grade (like in the case of unsuitable materialsencountered) shall be included in the measurement. Payment will be made at the contractunit price for Structural Excavation in the Bill of Quantities, which payment shall constitute fullcompensation for furnishing all labor and equipment necessary for excavation work and properdisposal of excess material excavated.Structural Foundation FillMeasurement for payment for Structural Foundation Fill will be based on the number of cubicmeters of fill materials placed within the neat lines as shown on the drawings. Payment willbe made at the contract unit price for the item, Gravel Bedding, in the Bill of Quantities, whichpayment shall constitute full compensation for furnishing, placing and compacting fill materials;labor which include spreading, compacting, etc., equipment and other incidentals necessary tocomplete the item.Special FoundationsMeasurement for payment for lean concrete and/or selected materials placed within the paylines for excavation will be based on the number of cubic meters in-place and accepted.Payment will be made at the contract unit price for the corresponding item shown in the Bill ofQuantities, which payment shall cover all costs for furnishing all labor, materials, equipment andtools necessary to complete the item.Structural BackfillMeasurement for payment for Structural Backfill (except backfill for drainage and seweragepipes, appurtenances and other structures of which cost of backfill is included in the cost ofinstalled pipes and appurtenances) will be based on the number of cubic meters of approved

materials, backfilled, satisfactorily compacted and accepted. Any backfill material placed outsideof the pay lines for excavation to replace slides or over-excavation will not be paid. Payment willbe made at the contract unit price for the item, Structural Backfill, in the Bill of Quantities, whichpayment shall constitute full compensation for furnishing all labor, materials and equipmentnecessary for backfilling work. Trench Excavation and Backfill for Sewerage, Drainage andWater Supply Pipes and Cable TrenchNo separate measurement and payment will be made for trench excavation and backfill forall sewerage, drainage and water supply pipes. Payment for trench excavation and backfillfor pipes shall be included in the payment for pertinent items for pipes shown in the Bill ofQuantities. In accordance with the specifications contained in this section, the Contractor shallfurnish all materials, labor, equipment and tools and perform all concreting works in accordancewith the drawings, or as otherwise directed.03 CONCRETE3100. CONCRETE REINFORCEMENTCLASS OF CONCRETEClass of concrete or strength shall be as indicated on the drawings. Unless specified, thecompressive strength of concrete shall conform to the requirement indicated on the provision ofNSCP for Concrete and/or shall not be less than 20.7 MPa.MATERIALSCementCement for concrete works shall be furnished by the Contractor and shall conform to therequirements of the latest edition of the Standard Specifications for Portland Cement (ASTMC150).Unless otherwise specified, cement shall be ordinary Portland Cement. Type I for generalconstruction which concrete is not in contact with soils or ground water and Type II for concretein contact with soil or ground water. Changing of brand or type of cement within the samestructure will not be permitted unless with prior permission and approval obtained from the UPBaguio.Reinforcing Steel The Contractor shall furnish all reinforcing steel of the sizes shown on thedrawings. The Contractor shall also prepare bar schedule, clean, cut, blend and place allreinforcing steel in accordance with the drawings. The Contractor shall also furnish all metalsupports, ties and other items required in the placement of reinforcing steel in its requiredposition.All reinforcing steel shall conform to the requirements of PNS 49:2002 for grade DSB 275,unless otherwise indicated on the drawings. All reinforcing steel shall be field bent. All bending,splicing and length of embedment shall be in accordance with the provisions of NSCP and/or latest ACI Code. All reinforcing steel at the time concrete is placed shall be free from oil,grease, rust, mud and other objectionable coatings, which might destroy or reduce its bond with

concrete.WaterWater for use in concrete shall be subject to the approval of the UP Baguio. It shall not be saltyand shall be reasonably clear and free from oil, acid, injurious alkali or vegetable matter.Fine AggregatesFine aggregates shall conform to the requirements of the latest edition of ASTM C33 andshall consist of hard, tough, durable and uncoated particles. Fine aggregates shall generallybe rounded or cubical and reasonably free from flat or elongated particles. A thin, flat andelongated particle is defined as a particle having a maximum dimension greater than 5 times itsmaximum dimension. Fine aggregate shall be well graded from coarse to fine, and gradationshall conform to the following requirements:Sieve Designation U. S.(Standard Square Mesh)9.5 mm (3/8")4. 76 mm (No. 4)1.19 mm (No. 16)0.297 mm (No. 50)0.149 mm (No. 1 00)Percentage byWeight Passing10095-10050-8510-302-10Coarse AggregatesCoarse aggregates shall conform to the requirements of the latest edition of ASTM C33 andshall consist of hard, tough, durable and clean, uncoated particles. All foreign materials and dustshall be removed by processing. Coarse aggregates shall generally be rounded and reasonablyfree from thin, flat and elongated particles (as defined in CW-5.3.4 above) in all sizes. Coarseaggregates shall be well graded from coarse to fine and gradation shall conform to the followingrequirements:Sieve DesignationU.S. Std. Square Mesh88.9 mm (3-1/2")76.2 mm (3")50.8 mm (2")38.1 mm (1-1/2")

25.4 mm (1")19.1 mm (3/4")9.5 mm (3/8")4.76 mm (No.4)2.38 mm (No. 8)General UseMassive ConcreteHeavy walls and slabs(0.75 m thick or more)Size GroupCumulative Percentage by Weight Passing19.1 mm(3/4") max.10090-10020-550-150-538.1 mm(1-1/2") max.10090-10020-550-150-576.2 mm(3") max.10090-10020-550-150-5Minimum General Aggregate Diameter76.2 mm (3")76.2 mm (3")Walls, slabs, beams(0.30 m to 0.75 m thick)Thin walls, slabs, beam(Less than 0.30 m thickness)STORAGE OF MATERIALSCement38.1 mm (1 %")19.1 mm (3/4")

Cement shall be stored in a dry, weather-tight, and properly ventilated structure with adequateprovisions for the prevention of absorption of moisture. All storage facilities shall be subjectto the approval of the UP Baguio and all cement shall be stored in such a manner andarrangement as to permit easy access for inspection and identification. Attention is directed tothe requirement that delivery of cement to the site of work shall be so scheduled that no cementshall remain in storage longer than thirty (30) days after issue by the manufacturer. To precludethe undue aging of stored cement, the Contractor will not be permitted to use cement newlydelivered to the job site whenever previously delivered cement is still available for use. Sackedcement shall not be stacked higher than fourteen sacks at any time during its storage.Reinforcing SteelReinforcing steel shall be placed on racks raised above the ground suitably protected fromdirect exposure to the elements.AggregatesFine and coarse aggregates shall be handled and stored separately in such a manner as toprevent the inclusion of foreign materials, segregation, or loss of fines.CONCRETING WORKSNotice Inspection: Give notice so inspection may be made of the following:- Setout prior to construction.- Footings prior to pouring concrete.GeneralThe written approval of the UP Baguio shall be secured prior to any concreting work. Allconcrete shall be poured on the dry and cleaned surfaces. Placing Reinforcement Reinforcingsteel shall be in accordance with the construction drawings, bar schedule, or as directedby the UP Baguio, with all the necessary wire ties, chairs, spacers and other approvedsupports necessary to install and secure them properly in place at the indicated spacing ofbars and distance from the forms. Such supports shall be of sufficient strength to maintainthe reinforcement in place throughout the concreting operating. All reinforcing bars, prior toplacing them in the forms, must be free of loose, flaky rust and scale, oil, grease, clay andother objectionable coatings that would reduce or destroy their bond with concrete. Concrete ormortar encrustation on bars, which have dried up, shall be removed to enable fresh concrete tobond with bars properly. All reinforcing steel shall be field bent. Bending, splicing and length ofembedment in concrete shall be in accordance with the drawings, or as directed by UP Baguio.In no case shall concreting start without prior inspection and approval by the UP Baguio of theplaced reinforcement.Mixing ConcreteMixing of concrete shall conform to the requirements of ACI Code for Concrete Construction.

Placing ConcreteConcrete shall be conveyed from mixers to the forms or to the place of deposit as rapidly aspossible and by methods that will prevent segregation or loss of ingredients. There shall be novertical drop greater than 1.5 meters except where suitable equipment like metal pipe or tremieis used. The pipe or tremie shall be kept full of concrete and its end shall be kept buried in thenewly placed concrete. Chutes through which concrete is delivered to the structure in a thin,continuously exposed flow will not be permitted except for very limited or isolated sections of thework. Earth surfaces, upon which concrete shall be placed, shall be cleaned, dry and thoroughlycompacted before placing the concrete. Rock surface, upon which concrete shall be placed,shall be thoroughly cleaned of loose or semi-detached or unsound rock particles. Before placingconcrete, all surfaces shall be wetted thoroughly to keep them in a completely moist condition,after which leveling mortar of the same cement ratio as the concrete mix complete contactbetween concrete and the leveled surface.Finishing ConcreteAfter the concrete has been deposited, distributed and vibrated, the concrete shall be struck offand screened by mechanical means approved by the UP Baguio. The finishing machine shall beof the screening and troweling type designed and operated both to strike off and to consolidate.Hand finishing may be employed when suitable finishing machines are not available. Finishingof concrete shall be done, as directed, to the satisfaction of the UP Baguio. All finished surfacesshall be tested with 3 meters straight edge and any variation of the surface from the desiredcrown or cross section shall be properly corrected.Removal of FormsForms shall be removed as soon as practicable in order to avoid delay in curing and to makepossible earliest practicable repair of surface imperfections, but in no case shall they beremoved without approval. Any needed repair or treatment shall be performed at once andshall be followed immediately by the specified curing. Forms shall be removed with care soas to avoid injury to the concrete and any concrete so damaged shall be repaired as directed.Concrete shall be cured for a period of not less than fourteen (14) consecutive days by keepingthe surfaces of concrete continuously (not periodically) wet. Where tongue and groove formswere used and left in place of curing, they shall be kept wet at all times prevent opening at thejoints and drying out of the concrete.Sampling and Testing of ConcreteNo concreting work on the project will be permitted to be done until UP Baguio signifies inwriting that, following the performance of the necessary tests, he gives his approval to the useof all materials involve in making the concrete. As work progresses, test cylinders shall befabricated from the concrete samples and tested in accordance with ASTM C31 and ASTM C39.At least one set of four (4) cylinders shall be made from each 75 cu.m of the concrete placed ofeach class. Also at least one set shall be made per day for each class of concrete placed eachday. Two (2) cylinders shall be tested at 28 days for specification compliance and one shall betested at 7 and 14 days respectively for information. The acceptance test result shall be theaverage of the strength of the two cylinders tested at 28 days.

The compressive strength of the concrete shall be deemed acceptable if the averages of thethree consecutive strength test results is equal to or exceeds the specified strength and noindividual test falls below the specified strength by more than 3.50 MPa. Concrete deemed tobe not acceptable using the above criteria maybe rejected unless the Contractor can provideevidence, by means of core tests, that the quality of concrete represented by the failed testresult is acceptable in place. Three (3) cores shall be taken in accordance with ASTM C42and soaked for 24 hours prior to testing. Concrete in the area represented by the cores will bedeemed acceptable if the average strength of the cores is equal to at least 85% of and no singlecore is less than 75% of the specified strength.MEASUREMENT AND PAYMENTConcreteMeasurement for payment for Concrete (except concrete which shall not be measured forseparate payment) will be based on the volume of concrete placed and accepted within theneat lines of the structure as shown on the drawings or in accordance with the manner ofmeasurement set forth in the various sections of the Technical Provisions. No deduction will bemade for rounded or beveled edges or space occupied by the metal items 10 sq. em. or less incross section, embedded in concrete. Payment will be made at the corresponding contract unitprice for the various items of concrete shown in the Bill of Quantities. Payment shall cover allcosts fit for furnishing all labor, materials, including equipment and tools required for concretingwork. Payment shall also include care of water.FLOOR SLAB FINISHFinish: After screeding and floating give the surface an anti slip texture with acove trowel finish.Colour: Natural greySCHEDULE OF CONCRETEAll pouring such as footing 3,000psi concrete, footing tie beam, footing slabs, girders, R.C.walls, slabs, column and stairs- 3,500psi concrete at 28 days.Cement - approved brand. Holcim - Portland cement.Gravel – G-1 crushed, ½” to ¾” in size.Sand – Crushed SandForms – use ½” thick plywood for all form works– use Steel formworks for circular columnsFILLING, GRADING AND SLAB ON FILLS

1-Part escombro, 2-part lastillas or barrow earth or its equivalent for all filling job, done in 6layers, fully compacted or depending on soil requirements or its equivalent. Filling shall beconfined on the building area as shown on plan.50mm. thick well compacted gravel and sand bedding immediately under slab on fills.Ground floor slab on fill 150mm thick, reinforced with 12mm dia rebars spaced at 0.200 meterson center both ways 3,500 psi.3200. REINFORCING STEELDESCRIPTIONThis work shall consist of furnishing, fabricating, and placing of steel reinforcement of the type,size, shape and grade required in accordance with these specifications and in conformity withthe requirements shown on the Drawings or as directed by the UP Baguio.MATERIAL REQUIREMENTAll material shall conform to the requirements hereinafter given. Certified test reports (mill testor other) shall be submitted to the UP Baguio for all reinforcement steel used. These tests shallshow the results of all chemical and physical tests made.Bar ReinforcementReinforcement bars for concrete shall be hot-rolled, weldable, deformed billet-steel barsconforming to the requirements specified in ASTM A615 and PNS 49 unless shown on theDrawings or as required by the UP Baguio. The use of the cold twisted bars is not permitted.If not otherwise shown on the drawings, the deformed reinforcement steel shall be Grade 60(minimum yield strength of 410 MPa) for 16 mm and bigger bars and Grade 40 (minimumyield strength of 275 MPa) for 12 mm and smaller bars. Bar reinforcement shall be shippedin standard bundles, tagged and marked in accordance with the Code of Standard Practice ofthe Concrete Reinforcement Steel Institute.Sampling The UP Baguio's Representative will sample reinforcement bars at the source ofsupply or at the point of distribution, and the Contractor shall notify the UP Baguio in sufficienttime advance to permit sampling and testing before shipment is made. Three (3) samples fromeach size shall be taken at random representing five (5) tons or fraction thereof of each size.CONSTRUCTION REQUIREMENTOrder List for Bent BarsBefore materials are ordered, the Contractor shall furnish all order lists and bending diagramsfor the approval of the UP Baguio. The approval of order lists and bending diagrams by the UPBaguio shall in no way relieve the Contractor of responsibility for the correctness of such listsand such lists and diagrams. Any expenses incident to the revisions of materials furnished inaccordance with such lists and diagrams to make them comply with the drawings shall be borne

y the Contractor. Shop Drawings for Reinforcing Steel (ACI 315): Indicate bending diagrams,assembly diagrams, splicing and laps of bars, shapes, dimensions and details of bar reinforcing,accessories and concrete cover. Do not scale dimensions from structural drawings to determinelengths of reinforcing steel.FabricationBent bar reinforcement shall be cold bent as shown on the drawings or as required by the UPBaguio. Bars shall be bent around circular pin having the following diameters (D) in relation tothe diameter of the bar (d):Bars 6mm¢> to 20mmct> inclusiveBars 25mmct> and 28mmct>Bars 32mmct> and greaterD=6dD=BdD=10dBends and hooks in stirrups and lateral ties may be bent to the diameter of the principal barenclosed therein.Steel Bars – all mild reinforcing bars shall be round “deformed structural grade” conforming toASTM A-615.12mm dia and smaller bars – fy = 228 MPa (33,000psi)16mm dia and larger bars – fy = 276 MPa (33,000psi)(See structural plans for other details)Protection of MaterialSteel reinforcement shall be protected at all times from injury. When placed in the work, itshall be free from dirt, detrimental scale, paint, oil or other foreign matter. However, whensteel has on its surface easily removable and detrimental rust, loose scale or dust, it shall becleaned by a satisfactory method, approved by the UP Baguio. Store reinforcement of thedifferent sizes in racks raised above the ground with accurate identification. Protect reinforcingsteel from contaminants such as grease, oil and dirt. Placing and Fastening Reinforcement& Miscellaneous Material (ACI 301) All reinforcement bars, stirrups, hanger bars, wire fabric,spirals and other reinforcing materials shall be provided as indicated in the drawing or requiredby the specification, together with all necessary wire ties, chairs, screws, supports, and otherdevices necessary to install and secure the reinforcement properly.All reinforcement, when placed, shall be free from rust, scale, oil, grease, clay, and othercoatings, and foreign substances that would reduce or destroy the bond. Rusting ofreinforcement shall not reduce the effective cross sectional area of the reinforcement to theextent that the strength is reduced beyond specified values. Heavy, thick rust or loose, flaky rustshall be removed by rubbing with burlap or other approved method, prior to placing.

Reinforcement that has bends not shown on the project drawings or on approved shopdrawings, or is reduced in section by rusting such that its weight is not within permissible ASTMtolerances, shall not be used. All reinforcement shall be supported and wired together to preventdisplacement by construction loads or by the placing of concrete. Unless directed otherwiseby the UP Baguio, reinforcement shall not be bent after being partially embedded in hardenedconcrete. Detailing of reinforcing shall conform to ACI 315. Where cover over reinforcing steel isnot specified or indicated, it shall be in accordance with ACI 318 All steel reinforcement shall beaccurately placed in position shown on the drawings or as required by the UP Baguio and firmlyheld there during the placing and setting of the concrete.Bars shall be tied at all intersections except where spacing is less than 30 mm in each direction,when alternate intersections shall be tied. Ties shall fasten on the inside. Distance from theforms shall be maintained by means of stays, blocks, hangers or other approved supports.Blocks for holding reinforcement from contact with the forms shall be pre-cast mortar blocks ofapproved shape and dimensions or approved chairs. Layers of bars shall, be separated by precastmortar blocks or by other equally suitable devices.The use of pebbles, pieces of broken stone or brick, metal pipe and wooden blocks or metalchairs shall not be permitted. Unless otherwise shown on the Drawings or required by the UPBaguio, the minimum distance between bars shall be 40mm. Reinforcement in any membershall be placed and then inspected and approved by the UP Baguio before the placing ofconcrete commences. Bundled bars shall be tied together at not more than 1.80 metersintervals. Reinforcement shall be placed accurately and secured. It shall be supported bysuitable chairs and spaces or by metal hangers.On the ground, and where otherwise subject to corrosion, concrete or other suitable noncorrodiblematerial shall be used for supporting reinforcement. Where the concrete surface willbe exposed to the weather in the finished structure or where rust would impair the appearanceor finish of the structure, all reinforcement supports, within specified concrete cover, shallbe galvanized or made of a suitable non-corrodible material. All placement or movement ofreinforcing steel after placement, to positions other than indicated or specified, shall be subjectto the approval of the UP Baguio. Concrete protection for reinforcement shall be as indicated, orif not indicated, in accordance with ACI 318.The minimum concrete cover for reinforcement specified in the bid documents shall takesprecedence over all permissible reinforcement placement variations; nothing in the variationslisted below is to be constructed as permitting violation or compromise thereof:a. Height of bottom barsb. Lengthwise positioningc. Spacing bars in wallsand solid slabsd. Spacing bars inbeams and footingse. Height of top bars

f. Stirrup spacing(1) For any one stirrup(2) For over-all group±6mm above form±50mm of bars±25mm±6mm±6mm±25mm±25mm of stirrupAnchors and bolts; including but not limited to those for the machine and equipment bases:frames or edgings, hangers and inserts, door bucks, pipe supports, pipe sleeves, pipe passingthrough walls, metal ties, conduits, flashing reflects, drains and all other materials in connectionwith the concrete construction shall, where practicable be placed and secured in position whenthe concrete is placed. Anchor bolts for machines shall be set to templates, shall be plumbedcarefully and checked for location and elevation with an instrument, and shall be held in positionrigidly to prevent displacement while concrete is being placed.SplicingSplicing of reinforcement shall be in accordance with ACI 318, except as indicated otherwiseor modified herein. Where splices in addition to those indicated on the drawings are necessary,they shall be approved by the UP Baguio prior to their use. Splices shall not be made in beams,girders, and slabs at points of maximum stress. Butt Splicing shall preferably be used overlapping for bar sizes larger than 32 mm. Splices to be welded shall conform to AWS D1.4;certification of weld ability of the reinforcement by the manufacturer, shall be submitted to theUP Baguio. If the Contractor elects to use butt splicing of reinforcing, he shall submit completedetails of the process to be used by the UP Baguio.If the butt splices are used the Contractor shall ensure that the splice meets the requirementsspecified herein by performing at least three splices which shall be submitted for tests to atesting laboratory that has been approved for such testing by the UP Baguio. The cost of theseshall be borne by the Contractor.All reinforcement shall be furnished in the full lengths indicated on the Drawings. Splicing ofbars, except where shown on the Drawings will not be permitted without the written approval ofthe UP Baguio. Splices shall be staggered as far as possible and with a minimum separation ofnot less than 40 bar diameters. Not more than one-third of the bars may be spliced in the samecross section, except where shown on the Drawings. Unless otherwise shown on the Drawings,bars shall be lapped a minimum distance of:Splice TypeTensionCompression

Grade 40 Min. lap 24d 20d But Not Less Than 300mm 300mm Where dis the diameter of thebar. In lapped splices, the bars shall be placed in contact and wired together. Lapped spliceswill not be permitted at locations where the concrete section is insufficient to provide a minimumclear distance of one and one-third the maximum size of coarse aggregate between the spliceand the nearest adjacent bar. Welding of reinforcing steel shall only be done if detailed on theDrawings or if authorized by the UP Baguio in writing. Spiral reinforcement shall be spliced bylapping at least one and half (11/2) turns or by butt-welding unless otherwise shown on thedrawings.MEASUREMENT AND PAYMENTThe quantity to be paid for shall be the calculated theoretical number of kilograms ofreinforcement steel bars as determined from the net length of the steel shown on the drawings,incorporated in the concrete and accepted. The weight of deformed bars will be computed fromthe theoretical weight of the same nominal size as shown in the following tabulation:Designation#2#3#4#5#6#8#9Size (mm)6101216202528Weight (kg/m)0.2220.6160.8881.5792.4683.8544.833#10#1132

366.3137.991Clips, ties, separators and other and related materials used for positioning and fasteningthe reinforcement in place as required by the UP Baguio shall not be included in the weightcalculatedpayment under this item. If bars are substituted upon the Contractor's request and asresult, more steel is used than specified; only the amount specified shall be included.When laps are made for splices, other than those shown on the drawings or required by theUP Baguio and for the convenience of the Contractor, the extra steel shall not be measurednor paid for. The accepted quantity shall be paid at the corresponding unit price for the item,Reinforcing Steel as shown in the Bill of Quantities which price and payment shall be madein full compensation for furnishing materials, labor, equipment and incidentals necessary tocomplete this item.04 MASONRY4100. CONCRETE UNIT MASONRYa. Concrete masonry walls shall be carried up and plumb all around. One section of the wall notbe carried up in advance of the others unless specifically approved. Unfinished work shall besteppe back for joining of new work.b. Heights of masonry shall be checked with an instrument at each floor, and at sills and headsof opening to maintain the level of the walls. Door and window frames, louvered openings,anchored pipes, ducts and conduits shall be built in carefully and in a neat manner as themasonry work progresses.c. Reinforcing shall be positioned accurately as indicated. As masonry work progresses, verticalreinforcing shall be rigidly secured in place at vertical intervals as indicated. Splices shall beformed by lapping bars not less than 20 bar diameters and wire tying them together.●Concrete Hollow Blocks – 6” thick. For all exterior walls and interior partitions unlessotherwise noted. Refer to wall details as specified on plan.Reinforcement – 12mm diameter reinforcing bars with vertical Spacing of 0.40 metersand Horizontal spacing of 0.60 meters.05 THERMAL AND MOISTURE PROTECTION5100. VAPOR BARRIERGENERAL

The work to be done under this section includes the furnishing of all labor, materials, equipment,and other facilities required to complete all moisture vapor barrier work as specified.All concrete floor slabs and walls in direct contact with the ground shall be provided withmoisture vapor barrier to stop movement of moisture from the ground through capillary action orosmotic pressure.MATERIALSa) Vapor Barrier - Vapor barrier shall be polyethylene sheeting with thickness as recommendedby the manufacturers and as approved by the UP Baguio Representative.b) Adhesive and/or Tape- Adhesive or tape shall be as recommended by the manufacturers asapproved by the UP Baguio Representative.●Place Perforated PVC Drainage pipe behind retaining walls to prevent ground andsurface water from penetrating or damaging building foundations.PHYSICAL PROPERTIESa) Tensile strength (lb/2" width) is 260.b) Moisture and vapor transmission (ASTM F. 96, Procedure E) Ungreased gm/sq.m/225 hoursis 25. Perms shall be 0.125.c) Greased (ASTM D1 027) 6M/sq. meter/24hours is 8. Perms shall be 0.27.APPLICATIONPrior to placing the concrete, the hard core fill should be compacted to a smooth even surface,eliminating all sharp projections or irregularities which may puncture the moisture and vaporbarrier. It is preferable in most cases to bring the fill to grade with a stiff mix of one part Portlandcement and three parts sand so placed as to provide a smooth even surface for installing themembrane, or to blind the hard core with a layer of consolidated sand. The net thickness ofconsolidated sand above the gravel fill shall not be less than 6.3mm. Cover the entire area witha layer of moisture and vapor barrier extending past the perimeter of the slab and turning upagainst walls for the depth of the concrete. The moisture and vapor barrier shall be lapped andthe exposed edges of polyethylene shall be sealed by either of the sealing set out below. Wherepipes and conduits must pass through the barrier, the material should be carefully cross slit sothat it fits tightly around the pipe, and then taped to the pipe with pressure sensitive tape.SEALINGa) Tape Sealing -To obtain an effective seal, moisture and vapor barrier should be lapped25mm (1 ") at all joints and sealed with 50 mm (2") pressure sensitive tape. A 50mm (2") widthof polyethylene film is left exposed on both edges for joining and it is important to ensurethat both surfaces are free from moisture and dust, and that the tape is in contact with thepolyethylene film on both sheets. If necessary, a firm base such as board can be placed underthe joint and the tape applied with firm pressure by hand or by mechanical applicator.

) Adhesive Sealing- Where adhesive sealing to be used, each alternate sheet must be invertedso that the exposed polyethylene strips of the alternate sheets of the barrier face downwards,ensuring that both surfaces are free from moisture and dust. The sheets shall be lapped 50mm(2") to ensure good adhesion and both surfaces shall then be coated with adhesive and the jointmade in accordance with the manufacturer's instructions.c) End Joint Sealing - End joint sealing should be effected by cutting the ends square, forming acontinuous single interlocking fold and sealing on both sides with adhesives.VAPOR BARRIERS UNDER CONCRETE SLAB ON THE GROUND LEVELAfter consolidating the sand bed under concrete floors and edge beams and before placing thereinforcement, the whole of the sand bed shall be covered with a layer of vapor barrier laid inthe longest lengths and widest available widths, lapped 25mm at all joints and intersections andsealed with the pressure sensitive tape. A 50mm width of polyethylene film shall be exposed onboth edges of the moisture vapor barrier where sealed joints are to be made and the contractorshall ensure that the tape is in contact with a film on both sheets, all in accordance with themanufacturer's instructions.Alternatively, adhesive sealing may be used in which case each alternate sheet shall beinverted, so that the exposed strips of the sheets are in contact. The sheets shall be lapped50mm and both polyethylene surfaces coated with the contact adhesive and firmly pressedtogether to form a moisture proof sealed joint. The moisture vapor barrier shall be carried downinto trenches, turned up at the side edge and after concrete has set, turned across on top ofconcrete slab under cavity flashing.MEASUREMENT AND PAYMENTMeasurement and payment for Vapor Barrier shall be based on the area of material installedand accepted by the UP Baguio Representative. Payment will be made at the correspondingcontract unit price per square meter for the pertinent item under Architectural Works in the Bill ofQuantities.Payment shall constitute full compensation for all labor, materials, equipment, tools and allincidentals necessary for the completion of this work.06 FINISHES6100. PLASTERINGAll masonry unit work or concrete work not specifically specified with finishing, exposed to viewshall be cement plastered. Plastering work shall be coordinated. Scaffolding shall be amplystrong, well braced, tied securely and inspected regularly. Over loading of scaffolding shall notbe permitted.

●●Wall finishes – all Interior CHB wall should be leveled and plaster cement finish.Wall finish – all Exterior CHB wall should be plaster cement finish.6200. FLOOR FINISH●●Plain cement finish (non-skid)Floor Slabs, columns - shall be poured monolithically and should reach the requireddepth to avoid additional concrete toppings or plaster cement finish.07 MECHANICAL7100. PLUMBING SYSTEMa. General - provide temporary water and sewer pipe outlets for the future installation of theplumbing system.