NCHRP Report 704 A Performance-Related Specification for

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Extra info for NCHRP Report 704 A Performance-Related Specification for Hot-Mixed Asphalt

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In the same way, the truck configuration is set to that of a Class 5 Vehicle (100%) and 0% for the rest of vehicle classes with a single axle. For simplicity again, no growth was assumed in the analysis. Thus, three of a possible 22 variables were required from this category: • Initial two-way AADTT (that will be transformed into annual 18-kip ESALs) • Operational speed (mph) • Traffic wander standard deviation The rest of the variables were set constant, in accordance with the 18-kip ESAL configuration, or because they did not matter for flexible pavement design.

The MEPDG can accept an 18-kip ESAL input by canceling some traffic variables and defining others accordingly. Thus, for example, the percent of trucks in the design direction can be changed to 100% since all of them are assumed to be 18-kip trucks. In the same way, the truck configuration is set to that of a Class 5 Vehicle (100%) and 0% for the rest of vehicle classes with a single axle. For simplicity again, no growth was assumed in the analysis. Thus, three of a possible 22 variables were required from this category: • Initial two-way AADTT (that will be transformed into annual 18-kip ESALs) • Operational speed (mph) • Traffic wander standard deviation The rest of the variables were set constant, in accordance with the 18-kip ESAL configuration, or because they did not matter for flexible pavement design.

Structure (4) The layer interface friction variable is assumed to be 1. 85) and the drainage path length and pavement cross slopes were left constant because they only influence the analysis of PCC pavements. 33 The asphalt layers sub-category was reduced by keeping constant the total unit weight, reference temperature, Poisson’s ratio, thermal conductivity of asphalt, and heat capacity of the asphalt mixture. It was assumed that a conventional 3 ⁄4 in. nominal aggregate size mix was used. Thus, the aggregate gradation values were left constant, as well as the effective binder content and air voids value.

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