Self-consolidating Concrete Prepared with Recycled Concrete Aggregate and Recycled Asphalt Pavement

Abstract

This paper investigates the fresh, mechanical, and durability characteristics of Self-Consolidating Concrete incorporating Recycled Concrete Aggregate and Recycled Asphalt pavement (SCC-RCA-RAP). Mixtures were divided into different groups, with constant water to cementitious materials ratio of 0.4, based on the recycled concrete aggregate (RCA) and recycled asphalt pavement (RAP) content: 0, 25, 50, and 75% of coarse aggregate (CA) replaced by equal percentages of RCA and RAP. All mixtures were designed with a target slump flow higher than 500 mm. The control mixture for each group was prepared with 100% Portland cement while all other mixtures were designed with different percentages of Portland cement replaced by a combination of Supplementary Cementitious Materials (SCMs) such as class C fly ash, and granulated blast furnace slag. Fresh concrete properties such as: flow ability, deformability; filling capacity, and resistance to segregation were investigated. Moreover, hardened characteristics such as, the compressive strength at different ages, and the split tensile strength were studied. The use of Supplementary Cementitious materials instead of cement has resulted in smaller 28-days-compressive strength compared to those of the control mixes. The use of RCA and RAP as a replacement of CA had an adverse effect on the hardened properties of SCC mixtures