ABSTRACT
This paper is aimed at identifying and characterizing pavement design considerations associated with using recycled materials for pavement subgrade stabilization. Traditionally, remove-replace option or stabilization with cement, lime, asphalt or other manufactured chemicals are used for subgrade improvements, when poor, unstable subgrade soils were encountered. Due to rising cost of these traditional stabilizers and the fill materials, highway and airport agencies are looking for recycled materials for subgrade stabilization. These recycled materials include Cement Kiln Dust (CKD), Lime Kiln Dust (LKD), Fly Ash (FA), Concrete Fines (CF) and others. An extensive laboratory study was performed to characterize the short-term, and long-term performance of subgrade soil samples stabilized with recycled materials. Using the laboratory test results, pavement design inputs were developed from a limited analytical investigation. The developed pavement design parameters include the stabilized layer moduli values for mechanistic-empirical pavement designs and structural layer coefficients for 1993 AASHTO pavement
