Transcription of Chapter 4 Thickness Design - APAI
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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.
pavement design. Design Procedure Tables 4-1 thr ough 4-5 can be used dir ectly to select design thicknesses fr om the design input factors. In order to use the tables, appropriate traffic and subgrade classes must be selected as follows. Traffic The design procedure separates traffic into six classes (I through VI). Each class is defined
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