Evaluation of Latex Modified Asphalt Mixture with Recycled Concrete Aggregate (RCA)

Natural rubber latex (NRL) is currently added into bitumen to improve the performance of asphalt concrete mtures.However, the addition of NRL increased the cost of production and road authorities are generally reluctant to use a higher cost product albeit with better performance.The use of RCA such as from building demolitions can offset this increase in cost in the use of NRL modified bitumen.However, there is a need to ensure that the quality of the asphaltic concrete is not compromised by the addition of RCA.This paper details a study to evaluate the use of NRL mdfd hlt bitumen together with 50 percent RCA on the performance of hot m hlt.Commercially produced bitumen mdfd with NRL was used for the hlt mes.Dense hltic concrete AC14 samples were then prepared using the mdfd bitumen together with the addition of 50 percent RCA by weight replacing the virgin aggregate.Performance tests were then carried out on the samples which include moisture susceptibility test, rlnt modulus test, nd dynamic creep test.The results revealed that the use of NRL together with 50 percent RCA to dense hltic concrete mes gave comparable performance to conventional dense asphalt concrete mixes.It can be concluded that the use of NRL modified bitumen together with 50 percent RCA can provide a costeffective solution to increase the performance of hot mix asphalt.