LARIMER COUNTY RURAL AREA ROAD STANDARDS

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Appendix D – Construction StandardsSection D.2 Revisions to CDOT Standards Specifications for Road and Bridge Constructionloosened stabilized material from the section. Recompaction of the loose material should not beattempted. The surface shall then be thoroughly compacted with the pneumatic roller, addingsmall increments of moisture as needed during rolling. If plus No. 4 aggregate is present in themixture, one complete coverage of the section with the fat wheel roller shall be madeimmediately after the “clipping” operation. When directed by the Engineer, surface finishingmethods may be varied from this procedure provided a dense, uniform surface, free of surfacecompaction planes, is produced. The moisture content of the surface material must bemaintained within the specified range during all finishing operations. Surface compaction andfinishing shall proceed in such a manner as to produce, in not more than two hours, a smooth,closely knit surface, free of cracks, ridges or loose material conforming to the crown, grade, andline shown on the plans.After the fly ash treated course has been finished as specified herein, the surface shall beprotected against rapid drying by either of the following curing methods for a period of not lessthan three days or until the surface or subsequent courses are placed:(a)(b)(c)Maintain in a thorough and continuously moist condition by sprinkling.Apply a two-inch layer of earth on the completed course and maintain in a moistconditionApply an asphalt membrane to the treated course, immediately after same is completed,the quantity and type of asphalt approved for use by the Engineer shall be sufficient tocompletely cover and seal the total surface of the base between crown lines and allvoids. If the Contractor elects to use this method, it shall be the responsibility of theContractor to protect the asphalt membrane from being picked up by traffic by eithersanding or dusting the surface of same. The asphalt membrane may remain in placewhen the proposed surface or other base courses are placed. Asphaltic emulsions arenot acceptable for the asphaltic membrane.After the fly ash treated course has been finished a specified, the treated area shall remain freeof all construction & vehicular traffic for a minimum of 24 hours.D.2.10 Revision of Section 401 – Plant Mix PavementsREVISION OF SECTION 401PLANT MIX PAVEMENTS – GENERAL(NON-VOIDS ACCEPTANCE)Delete subsection 401.02(a) and replace with the following:Prior to beginning paving each calendar year, the contractor shall submit to the County forreview and approval, a mix design for each mix type he proposes placing in Larimer Countyright of way. The County may also require mix designs from the Contractor during the yearbecause of changes in the physical properties or source of the aggregates, or physicalproperties or source of the binder. Mix designs shall be developed using the SuperPavemethod of designing paving mixtures.Larimer County Rural Area Road Standards Page D-13October 22, 2007
Appendix D – Construction StandardsSection D.2 Revisions to CDOT Standards Specifications for Road and Bridge Construction(a)Mix Design. The Contractor shall submit the following to the Engineer:A proposed plant mix pavement mix design from an independent Laboratory prepared inaccordance with Colorado Procedure 52, including a proposed job-mix gradation foreach mixture required by the Contract which shall be wholly within the Master RangeTable, Table 703-3A, B, and C, before the tolerances shown in Table 401-1 are applied.The weight of lime shall be included in the total weight of the material passing the No.200 sieve. The restricted zone boundaries given in the Asphalt Institutes’ SuperPaveSeries No. 2 (SP-2) Manual are to be used as guidelines in mix design development.However, the job-mix gradation is not required to pass above or below the restrictedzone boundaries.The job-mix formula for each mixture shall establish a single percentage of aggregatepassing each required sieve size, a single percentage of bituminous material to beadded to the aggregate, and a single temperature for the mixture at the discharge pint ofthe plant.No hot mix asphalt (HMA) shall be placed prior to submittal of a mix design and approvalof the job-mix formula.Subsection 401.02(b) shall include the following:The top layer of HBP shall not contain any reclaimed asphalt pavement. Layers belowthe top layer shall not contain more than 15 percent reclaimed asphalt pavement. Thereclaimed asphalt pavement shall meet the requirements for subsection 703.04.Delete subsection 401.11 and replace with the following:401.11 Tack Coat. When ordered by the Engineer, a tack coat shall be applied betweenpavement courses. Tack coat shall be applied to all existing asphalt surfaces that are morethan 12 hours old or have not been kept clean.Subsection 401.16 shall include the following:Thickness Tolerance. In place pavement thickness shall be determined as follows. Thepavement shall be cored at 500 foot intervals, or fraction thereof, in each 12 foot lane (nominal),with a minimum of 3 cores taken for any area. The County may require additional cores todefine deficient areas. Any deficiency in the total thickness of the asphaltic pavement shall notexceed ½ inch for any one sample with the average deficiency for all samples not to exceed ¼inch. Final decision for correction of deficiencies shall be made by the Engineer.In Subsection 401.16 delete paragraph nine (9) and replace with the following:The Engineer will delineate the areas to be evaluated and inform the contractor of the locationand extent of these areas.In Subsection 401.16 delete the last paragraph and replace with the following:Coring will be done at the expense of the Contractor.Larimer County Rural Area Road Standards Page D-14October 22, 2007
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LARIMER COUNTYRURAL AREA ROAD STAND
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Table of Contents3.3.11 Typical Str
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Table of ContentsCHAPTER 8 - ENVIRO
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Table of Contents12.3.7.2 Conventio
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Table of ContentsG.7.12 Other Permi
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Chapter 1 - General InformationSect
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Chapter 2 - Submittal ProceduresSec
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Chapter 2 - Submittal ProceduresSec
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Chapter 3 - Submittal Requirements
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Chapter 4 - Road Design and Technic
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4.9.1.7 Design VehiclesChapter 4 -
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CHAPTER 5 - GEOTECHNICAL STANDARDS
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Chapter 5 - Geotechnical Standards
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Chapter 6 - STORMWATER MANAGEMENTSe
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Chapter 7 - Bridges and Major Drain
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Chapter 8 - Environmental and Agric
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Chapter 8 - Environmental and Agric
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9.1.3 DefinitionsChapter 9 - Roadwa
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CHAPTER 10 - ACCESS REQUIREMENTS AN
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Chapter 10 - Access Requirements an
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Page 71 and 72: CHAPTER 11 - ACCESS AND UTILITY PER
Page 73 and 74: Chapter 12 - Right of Way Permittin
Page 93 and 94: Appendix A - Definitions and Abbrev
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Page 97 and 98: APPENDIX B - REFERENCES AND RESOURC
Page 110 and 111: APPENDIX D - CONSTRUCTION STANDARDS
Page 112 and 113: Appendix D - Construction Standards
Page 130 and 131: APPENDIX E - CONSTRUCTION TESTING F
Page 132 and 133: Appendix F - Guidelines for Traffic
Page 140 and 141: APPENDIX G - DESIGN AND CONSTRUCTIO
Page 142 and 143: Appendix G - Design and Constructio
Page 154 and 155: Appendix H - General NotesSection H
Page 162 and 163: APPENDIX I - VARIANCE REQUEST SUBMI
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LARIMER COUNTY RURAL AREA ROAD STANDARDS

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