Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT03050 – Concrete and Utility StructuresIssue Date:September 28, 2012Page #:6 of 82.2 STRUCTURAL SLABSA. The CONTRACTOR shall be responsible for furnishing and installing allstructural slabs (HS25).B. The CONTRACTOR shall furnish and install all necessary materials required toconstruct the HS25 slabs as shown in the Plan details. Structures shall beassembled in accordance with the structure manufacturer’s recommendations.C. HS25 Slabs: When applicable, the location and approximate size of HS25 slabsare noted in the Plans. If the CONTRACTOR chooses to sequence the work in amanner that would place either construction haul roads or traffic above theOWNER’S facilities with less than two (2) feet of cover for any amount of time,the CONTRACTOR shall be responsible for installing a reinforced concrete slab,constructed to the specifications provided by the ENGINEER, above the facilityas a method of protecting the facility with no additional compensation. Theexception to this cover requirement would be for the explicit installation ofroadway subgrade, curb, gutter, and pavement installation directly above theOWNER’S facilities. The CONTRACTOR may chose an alternative method for“bridging” over existing facilities (steel plates, precast concrete slabs, etc.), andmay submit any proposed method to bridge the pipe in lieu of an HS25 or otherreinforced concrete slab to the OWNER for review and approval.D. Cement used for concrete structural slabs shall be Type IIA (airentrained), TypeIII (highearly strength), or Type IIIA (airentrained highearly strength) Portlandcement conforming to ASTM C150 or equal as approved by the OWNER.E. Concrete structural slabs shall meet the requirements of Class B or higher asoutlined in VTrans specification.F. The minimum 28day cure strength for concrete structural slabs shall be 4,100 psi.2.3 CONCRETE AND MASONRY WALL PENETRATIONSA. All concrete and masonry wall openings for hot water pipe, sleeves, casings, orconduit pipe shall be sealed with the following:1. NonShrink Grout: Pour Rok ® , Embeco ® 636, or approved equal.2. Water Sealing Material: SikaSet ® Plug, or approved equal.3. Exterior Waterproofing System: All building wall penetrations shall be sealedwith an elastomeric sealant approved by the OWNER for use on foundationCONCRETE AND UTILITY STRUCTURES030506