LARIMER COUNTY RURAL AREA ROAD STANDARDS

Appendix D – Construction StandardsSection D.2 Revisions to CDOT Standards Specifications for Road and Bridge ConstructionD.2.11 Revision of Section 403 – Hot Mix AsphaltREVISION OF SECTION 403HOT MIX PAVEMENTSubsection 403.02 shall include the following:The design mix for hot mix asphalt shall conform to the following:TABLE 403-1PropertyTestMethodValues For All Gradings(75) (100) CommentsAir Voids, percent at:N (initial) [information only]N (design)CPL 5115>9.53.5 – 4.5>11.03.5 – 4.5Lab Compaction (Gyrations):N (initial)[ information only]N (design)CPL 51157758100Stability, minimum CPL 5106 28 30Aggregate Retained on the No. 4Sieve with at least 2 MechanicallyInduced fractured faces, %minimumAccelerated MoistureSusceptibility Tensile StrengthRatio (Lottman), minimumCP 45 70 70CPL 5109Method B80% 80%Minimum Dry Split TensileStrength, kPa (psi)CPL 5109Method B205 (30) 205 (30)Grade of Asphalt Cement, AllLayersSee Table 403-3 and403-4Voids in the Mineral Aggregate(VMA) % minimumCP 48See Table403-2See Table403-2Voids Filled with Asphalt (VFA), % AI MS-2 65 - 80 65 - 75Dust to Asphalt Ratio:Fine GradationCourse Gradation0.6 – 1.20.8 – 1.60.6 – 1.20.8 – 1.6Note: AI MS-2 = Asphalt Institute Manual Series 2Note:The current version of CPL 5115 is available from the Colorado Department ofTransportation Region 4 Materials Engineer.Larimer County Rural Area Road Standards Page D-15October 22, 2007