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 ConstructionTable 403-3Binder Grade and Design Gyration RequirementsNew Construction or ReconstructionOverlayLocal PG 58-28 (75) Local / Residential PG 58-28 (75)Minor Collector PG 64-28 (75) Minor Collector PG 64-22 (75)Major Collector PG 64-28 (75) Major Collector PG 64-22 (75)Industrial /Industrial /PG 64-28 (100)CommercialCommercialPG 64-22 (100)Arterial PG 64-28 (100) Arterial PG 64-22 (100)Table 403-3 lists the minimums however, Larimer County may require grade bumping toaccount for extreme traffic flow and traffic loading conditions on Collector and Arterial roadways.This may be required on new construction, reconstruction and overlays and will be determinedbased on Table 403-4.Table 403-4Grade Bumping CriteriaConditionBinder Grade IncreaseSlow Moving Traffic Loads1 Grade Higher Than Free FlowingStanding Traffic Loads2 Grades Higher Than Free FlowingTotal 18k ESAL •1 Grade Higher Than Free FlowingTotal 18k ESAL •2 Grades Higher Than Free Flowing1. Free flowing traffic is traffic at speeds greater than 45 miles/hour2. Slow moving traffic is traffic moving between 12 miles/hour and 45 miles/hour3. Standing traffic is traffic moving less than 12 miles per hour4. No adjustment will be allowed for the low temperature grade because of traffic speed orvolumeThe Contractor shall prepare a quality control plan outlining the steps taken to minimizesegregation of HBP. This plan shall be submitted to the Engineer and approved prior tobeginning the paving operations. When the Engineer determines that segregation isunacceptable, the paving shall stop and the cause of segregation shall be corrected beforepaving operations will be allowed to resume.The top layer of HBP shall not contain any reclaimed asphalt pavement. Layers below the toplayer shall not contain more than 15 percent reclaimed asphalt pavement. The reclaimedasphalt pavement shall meet the requirements for subsection 703.04.The contractor shall use an approved anti-stripping additive. The type and amount may beeither of the following:Liquid Additive – The amount of additive used shall be a minimum of 0.5 percent by weight ofthe asphalt cement. The additive shall be added at the refinery or at the hot plant. If the liquidanti-stripping additive is added at the plant, an approved in-line blender must be used. Theblender shall be in the line from the storage tank to the drier drum or pug mill. The blender shallapply sufficient action to thoroughly mix the asphalt cement and anti-stripping additive.Larimer County Rural Area Road Standards Page D-17October 22, 2007
Appendix D – Construction StandardsSection D.2 Revisions to CDOT Standards Specifications for Road and Bridge ConstructionHydrated Lime - A minimum of 1 percent hydrated lime by mass (weight) of the combinedaggregate shall be added to the aggregate for all hot mix asphalt.Subsection 403.03 shall include the following:The contractor shall construct the work such that all roadway pavement placed prior to the timepaving operations end for the year, shall be completed to the full thickness required by theplans. The Contractor’s Progress Schedule shall show the methods to be used to comply withthis requirement.Subsection 403.05 shall include the following:The Contractor shall collect the scale ticket on each load when it is delivered to the project site,and ensure that the information required in subsection 109.01 is shown on each ticket.The scale tickets shall be available on site for county personnel to inspect.D.2.12 Revision of Section 412 – Portland Cement ConcretePavementREVISION OF SECTION 412PORTLAND CEMENT CONCRETE PAVEMENTSubsection 412.16 shall include the following:The Contractor shall be responsible for taking adequate steps to protect concrete placed duringprecipitous, hot or cold weather. Any concrete damaged by precipitation or extremetemperatures shall be removed and replaced.It shall be the Contractor’s responsibility to protect, by the use of barricades, signs, etc., freshconcrete from damage as a result of vandalism or other causes; damaged concrete shall berepaired or removed and replaced.Subsection 412.21 shall be deleted and replaced with the following:The thickness of the pavement shall be determined by average caliper measurement of corestested. A minimum of 2 cores per 1000 square yards will be taken at random. Should anydeviation be found, additional cores may be taken to define the horizontal limits of the deviation.When measurement of the core from a unit is not deficient by more than 1/2 inch from thedesign thickness, the pavement thickness will be considered to be within acceptable tolerance.When such measurement is deficient more than 1/2 inch, two additional cores at intervals notless than 300 ft will be taken and used to determine the average thickness for that area. Whenthe average thickness of pavement area is deficient by more than 1/2 inch the Engineer mayrequire that the area be removed and replaced.Larimer County Rural Area Road Standards Page D-18October 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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CHAPTER 11 - ACCESS AND UTILITY PER
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Chapter 12 - Right of Way Permittin
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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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