Potential Use of Recycled Concrete Aggregates in Bituminous Concrete for Flexible Pavement


Pushpinder Singh, Assistant Professor,
Civil Engineering Department, Bhai Gurdas Institute of Engineering and Technology, Sangrur, Punjab, India.


The need for recycling and reusing the waste materials has been arising due to disposal problems and other problems like excessive mining, depletion of natural resources. The present study focused on the utilization of demolition concrete waste in the form of aggregates in bituminous concrete (BC) mixes before and after thermal treatment. Experimental results showed that Marshall mix design parameters were satisfying the permissible requirements in case of bituminous concrete mixes prepared by using the recycled concrete aggregates (RCA) and thermally treated concrete aggregates (TRCA), though the optimum bitumen content was more as compared to mixes prepared with natural aggregates. Thermal treatment had positive impact on Retained stability value, but Marshall stability value in case of TRCA mixes was observed as lesser than that of RCA mixes. Material cost analysis suggested that the utilization of RCA is economical as compared to natural aggregates. Keywords: demolition concrete waste; recycled concrete aggregates; thermal treatment; natural aggregates; bituminous concrete.