Stress–Strain Behaviour of Self-consolidated Processed Recycled Aggregate Concrete

Abstract

Self-consolidating concrete (SCC) is considered as a special concrete that streams and strengthens by its self-weight and passes through the congested reinforcement without any segregation and mechanical vibration. In the recent era, a bombastic amount of construction and demolition (C&D) scrap produced from deteriorated structures and ready mix concrete plants is creating a severe environmental pollution. This has encouraged the reuse of C&D scrap as aggregates in concrete. Utmost investigation was carried out on the consumption of recycled coarse aggregate (RCA) in self-consolidating concrete. In the present study an experimental investigation has been carried to develop SCC mixes of standard grades M35 and M45 using unprocessed and processed RCA at different percentage replacements of natural coarse aggregate (NCA) (0, 25, 50, 75 and 100% by weight) as per Nan-Su method. The processing of RCA is done using Deval’s abrasion testing machine for different number of revolutions. Fresh properties of SCC were determined by means of slump-flow, L-box and V-funnel. The perfunctory properties such as compressive strength and stress–strain behaviour were determined. It has been observed that the usage of processed recycled coarse aggregate obtained higher compressive strength compared with unprocessed recycled coarse aggregate in SCC. The portion of recycled aggregate content increase has shown that the peak stresses are lower and their corresponding strains are higher. From the experimental findings it has been noticed that the processing of recycled aggregate up to 500 revolutions and 50% replacement of natural aggregate showed the optimum results.