Development of Methodology to Include Structural Contribution of Alternative Working Platforms in Pavement Structure (05-1395)**
Burak Fevzi Tanyu, George Mason University

This study was conducted to develop a methodology to incorporate the structural contribution of working platforms, including those constructed with industrial by-products, into the design of flexible pavements. Structural contribution of the working platform was quantified using the 1993 AASHTO flexible pavement design guide in terms of a structural number or an effective roadbed modulus. Resilient modulus obtained from large-scale model experiments conducted on several working platform materials (i.e., breaker run, grade 2 gravel, foundry slag, foundry sand, and bottom ash) were used in the analysis. Design charts are presented that show the structural number or the roadbed modulus as a function of type of material and thickness of the working platform.