Chapter 4 Thickness Design - APAI

Thickness Design4-1 Chapter 4 Thickness DesignGENERAL CONSIDERATIONSS everal procedures can be used to calculatethe Thickness of the proposed asphaltpavement. All are based on the volume andweight of the traffic that will use the facilityand on the load-supporting capability of theunderlying AASHTO Road Test and other studieshave indicated that heavy-vehicle wheel loadscause much greater damage to roads than dolight loads. Thus, where large volumes oftraffic with heavily loaded trucks are antici-pated, an in-depth analysis of the pavementthickness is important. Because all of thehigher functional classifications have thepotential for heavy loadings, a traffic analysisis an important part of the preparation forthickness computations. Similarly, a know-ledge of the load-bearing capability of the soilis an important aspect of the structural designprocess. The lack of a soil study with appro-priate corrective action could significantlyshorten the life of a poorly drained of the Design procedures available for astructural Thickness analysis cannot beincluded here.

Design Manual(MS 1) and their Simplified and Abridged Versionpublished in Informa-tion Series No. 18 (IS-181). Another reference is The AASHTO Guide for Design of Pavement Structures, 1986. These guides are based on mechanistic/empirical design models, and they use Nomographs to attain pavement thickness. Several computer programs for

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