Utilization of Construction and Demolition Waste in Self Compacting Concrete

IJEP 42(11): 1400-1408 : Vol. 42 Issue. 11 (November 2022)

Chandan Kumar Gupta*, A. K. Sachan and Rakesh Kumar

Motilal Nehru National Institute of Technology, Prayagraj, Uttar Pradesh – 211 004, India

Abstract

Recycled coarse aggregate and natural coarse aggregate are two different aggregate, one of aggregate consist of old mortar over it and that is recycled aggregate whereas natural aggregates are fresh. This paper presents results of an experimental investigation using construction and demolition waste, that is recycled coarse aggregate (RCA). The RCA was obtained from IL and FS Environmental Infrastructure and services Ltd., New Delhi. Due to the large construction activity, it requires to find the suitable material to replace natural material for manufacturing concrete. In this investigation influence of different quantity of RCA on self compacting concrete (SCC) in fresh and hardened state was undertaken. The properties obtained from SCC using RCA were compared with SCC having 100% natural coarse aggregate (NCA), that is control concrete. The NCA was replaced with RCA by a quantity of 20%, 40%, 60%, 80% and 100%. The fresh characteristic of SCC was investigated using slump flow test, V-funnel test and L-box test. The hardened properties obtained were compressive strength tests after 7, 28, 56 and 90 days of curing and tensile strength after 28 days of curing. It was observed from the result that fresh properties of concrete made with RCA changes slightly upto 40% and considerable changes was noticed above 40% as compared to concrete made with natural coarse aggregate due to high water absorption. In the hardened state results of different strength properties, show that upto 60% replacement level there is slight decrease in strength but above 60% it increases. Main disadvantage noticed from the research work was as increasing the percentage of RCA, water absorption also increases. Durability of SCC using RCA was observed by keeping the sample for water absorption test, alkalinity test and sulphate attack. The water absorption increases with increasing the RCA content.

Keywords

Recycled coarse aggregate, Water absorption, Construction and demolition waste, Old mortar, Self compacting concrete, Sulphate attack

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