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 Constructionmaintained in a satisfactory and workmanlike manner. Two self-propelled rotary typemixing machines, capable of performing the work as specified, shall be provided.CONSTRUCTION REQUIREMENTS308.03 General. The Contractor shall construct a completed course of treated material whichcontains a uniform fly ash/soil mixture with no loose or segregated areas; has a uniform densityand moisture content; is well bound for its full depth; and has a smooth surface suitable forplacing subsequent courses. Variation from the subgrade plan elevations specified shall not bemore than 0.08 foot. Where bituminous or concrete surfacing materials are to be placed directlyon the subgrade, the subgrade plane shall not vary more than 0.04 foot. It shall be theresponsibility of the Contractor to regulate the sequence of his work; to process a sufficientquantity of material to provide full depth treatment as shown on the plans; to use the properamounts of fly ash; to maintain the work; and to rework the courses as necessary to meet theabove requirements.308.04 Processing Materials.(a)(b)Preparation of Subgrade. Before construction operations begin, the subgrade shall begraded and shaped to enable the fly ash treatment of materials in place in conformancewith the lines, grades, and thickness shown on the plans. Unsuitable soil or materialsshall be removed and replaced with acceptable material.Fly Ash Application. The fly ash shall be spread by an approved spreader at the ratesshown on the plans or as directed by the Engineer. A motor grader shall not be used tospread the fly ash.The fly ash shall be distributed at a uniform rate and in such a manner as to reduce thescattering of fly ash by wind to a minimum. Fly ash shall not be applied when windconditions, in the opinion of the Engineer, are such that blowing fly ash becomesobjectionable to traffic or adjacent property owners.(c)Mixing. The soil and fly ash shall be thoroughly mixed by use of at least two selfpropelledrotary type mixing machines, capable of performing the work as specified andthe mixing continued until, in the opinion of the Engineer, a homogenous, friable mixtureof soil and fly ash is obtained, free from all clods or lumps. Water required to achievethe specified moisture content for the mixture should be added during final mixing.If the soil/fly ash mixture contains clods, they shall be reduced in size by raking, blading,disking, harrowing, scarifying or the use of other approved pulverization methods so thatwhen all nonslaking aggregates retained on the No. 4 sieve are removed, the remainderof the material shall meet the following requirements when tested at the field moisturecondition by laboratory sieves:Minimum Passing 1-3/4 inch sieveMinimum Passing No. 4 sieve100 percent60 percentDuring final mixing, water shall be added to the materials as directed by the Engineer,until the proper moisture content has been secured. Water shall be added through thepulverizing machine or other method acceptable to the Engineer to develop a uniform,Larimer County Rural Area Road Standards Page D-11October 22, 2007
Appendix D – Construction StandardsSection D.2 Revisions to CDOT Standards Specifications for Road and Bridge Constructioncontrolled rate addition of the needed moisture. Final moisture content of the mix, priorto compaction, shall not exceed the optimum moisture content of the mix by more than 2percent nor by less than the optimum by more than 4 percent. Should the naturalmoisture content of the soil be above the specified range, aeration of the soil may berequired prior to addition of the fly ash.308.05 Compaction. Compaction of the mixture shall begin immediately after final mixing ofthe fly ash and be completed within one hour following addition of water to the fly ash. Thematerial shall be sprinkled as necessary to maintain the optimum moisture. Compaction of themixture shall begin at the bottom and shall continue until the entire depth of mixture is uniformlycompacted to a specified density.All non-uniform (too wet, too dry, or insufficiently treated) areas which appear shall be correctedimmediately by scarifying the areas affected, adding or removing material as required,reshaping and recompacting. The surface of the course shall be maintained in a smoothcondition, free from undulations and ruts, until other work is placed thereon or the work isaccepted.The stabilized section shall be compacted to the extent necessary to provide the densityspecified below:For fly ash treated subgrade, existing subbase ormaximumexisting base that will receive subsequent subbaseor base courses.For fly ash treated subbase or base that willmaximumreceive surface course.Not less than 95 percentdry density (ASTM D-698)Not less than 96 percentDry density (ASTM D-698)In addition to the requirements specified for density, the full depth of the material shown on theplans shall be compacted to the extent necessary to remain firm and stable under constructionequipment. After each section is completed, tests as necessary will be made by the Engineer.If the material fails to meet the density requirements, the Engineer may require it to be reworkedas necessary to meet those requirements or require the Contractor to change his constructionmethods to obtain required density on the next section. Throughout this entire operation theshape of the course shall be maintained by blading, and the surface, upon completion, shall besmooth and in conformity with the typical section shown on the plans and to established linesand grades. Blading should be terminated within two hours after blending of the fly ash. Shouldthe material, due to any reason or cause, lose the required stability, density, and finish beforethe next course is placed or the work is accepted, it shall be reprocessed, recompacted andrefinished at the sole expense of the Contract. Reprocessing shall follow the same pattern asthe initial stabilization, including the addition of fly ash.308.06 Finishing and Curing. After the final layer or course of the treated subgrade, subbase,or base has been compacted, it shall be brought to the required lines and grades in accordancewith the typical sections.The resulting base surface shall be thoroughly rolled with a pneumatic tire roller and “clipped”,“skinned”, or “tight bladed” by a motor grader to a depth of approximately ¼ inch, removing allLarimer County Rural Area Road Standards Page D-12October 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 69 and 70: Chapter 10 - Access Requirements an
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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