Abstract
An experimental program was undertaken for determining the feasibility of demolition concrete waste for utilization in subbase, base, and binder course of flexible pavement. Marshall mix design and retained stability test were conducted for predicting the performance of recycled concrete aggregates (RCA)and thermally treated recycled concrete aggregates (TRCA) in binder course as dense bituminous macadam (DBM) in comparison to natural aggregates (NA).DBM mixes containing RCA and TRCA observed satisfactory results, though the optimum bitumen content (OBC) was more as compared to mixes containing NA. OBC for mixes containing NA, RCA, and TRCA was observed as 5.15%, 5.95%, and 5.83%, respectively. Thermal treatment of RCA had a positive impact on its properties resulting in improved results in the context of optimum bitumen content and retained stability but had a negative impact on Marshall stability. Compaction and California Bearing Ratio test results concluded that RCA was meeting the required specifications for utilization in the subbase/base course.
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