Cement-treated bases containing reclaimed asphalt pavement, quarry by-products, and fibers

A laboratory study was conducted to demonstrate that sustainable cement-treated base courses can be achieved through the application of waste quarry by-products (QB) and fractionated reclaimed asphalt pavement (FRAP). Aggregate packing tests were performed on blends of QB and FRAP to determine an optimal blend that would minimize the void content of the aggregate structure while achieving acceptable strengths. The optimal aggregate packing proportions were found to be 70% QB with 30% FRAP. Modified Proctor samples were prepared to determine the moisture density relationship with several cement contents (2% to 4% by total volume) on dolomite or FRAP coarse aggregate mixed with QB and 0.4% synthetic macrofibers. Mixture design performances were evaluated through strength (compression and split tension) and modulus tests. As expected, higher cement content increased both the strength and elastic modulus for all mixes tested. Mixtures containing virgin aggregates with QB yielded statistically greater elastic moduli than mixtures with FRAP and QB. Fibers did not have a statistical effect on strength or elastic modulus but did provide residual shear capacity across cracks. The QB and FRAP or virgin mixtures with 3% to 4% cement content exceeded the strengths for typical cement-stabilized base materials in the literature. The measured strength and elastic modulus properties show that QB, together with FRAP or virgin aggregates, can be successfully applied as a cement-treated foundation layer.