USE OF RECLAIMED ASPHALT PAVEMENT AS AN AGGREGATE IN PORTLAND-CEMENT CONCRETE

The main objective of this research is to investigate the potential us e of reclaimed asphalt pavement (RAP) as an aggregate in portland ceme nt concrete (PCC). RAP aggregate funer than #4 (4.75 mm) sieve was tre ated us Pile materials white those particles passing 3/4 inch (19.05 m m) and retained on #4 sieve were treated as coarse aggregate. One set of concrete cylinders was prepared using 100, 75, 50, 25, and 0 percen t RAP as coarse aggregate while fine aggregate was 100 percent RAP. An other set of samples was made using 100, 75, 50, 25, and 0 percent RAP as fine aggregate while coarse aggregate was 100 percent RAP. Samples were prepared rising water-cement ratios of 0.40 and 0.50. In additio n, control mixtures containing 100 percent conventional aggregate (gra vel and sand) were made for comparison purposes. Higher compressive st rength was obtained as the percentage of RAP aggregate was deer-eased for all mixtures. The control specimens yielded the highest compressiv e strength. However, the strength was sufficient to qualify the use of RAP aggregate in concrete applications such as barriers sidewalks, dr iveways, curbs pipes, and gutters. Furthermore, mixtures containing RA P aggregate had enhanced ductility and shelved excellent shatter resis tance properties. Additional studies should investigate the use of add itives and admixtures with RAP aggregate.