Impact of Recycled Concrete Aggregate and Recycled Asphalt Pavement as an Aggregate Gradation on Properties of Fresh and Hardened Concrete

Abstract

Recycle concrete (RCAs) and asphalt Pavement (RAPs) as an aggregate become gradually the focus of the study around the world nowadays. The main of this search were to evaluate recycled concrete aggregates (RCAs) and asphalt Pavement (RAPs) which were previously manufactured using north Sinai materials to use information that aided TDOT professionals in developing adequate recycle aggregates gradation that satisfying Egyptian code and specifications limits for selecting RCAs and RAPs for future concrete mix. The use of RCA in asphalt concrete mixes is one of the best ways to solve this problem and meet the sustainability goal at the same time. this search concerned with using effect of North Sinai aggregates materials that extracted from the demolition of buildings and pavement as recycle concrete and recycle asphalt aggregate RAP which modified to be more appropriate for fresh and hardened concrete. A total of six different concrete mixes were investigated. First, Tarantula Curve was used to test the use of 100% Original Gradation of (RCAs) and (RAPs) in concrete mix. The Original Gradation was modified with 10% #1” improved gradation G1, and 10% # 1" + 10% #4 +Reduction10% # 3/8" G2. Results showed that RCAs is Better and more impressive results than RAP in fresh and hardened properties. the effects of the types of graduations on concrete were investigated. Compressive strength was assessed at 7 and 28 days, and flexural behavior and modulus of elasticity was measured at 28 days. The results of strength, flexure and modulus of elasticity for (RCAs) were higher than (RAPs), The highest compressive strength for mix RCA3 and RAP3 with 10% # 1" + 10% #4 +Reduction10% # 3/8" G2, was 42.3 MPa and 40.6 MPa at 28 curing age, all mixes results were less.