Experimental studies on durability and deflection behavior of concrete in metakaolin cement concrete

Abstract

The most frequently used components in conventional concrete are cement, sand, coarse aggregate, and water. Cement production and hydration produce a lot of heat and release the greenhouse gas CO2, which contributes to climate change and global warming. By employing industrial wastes like GGBS, metakaolin, and copper slag, concrete may be manufactured largely without cement and sand. In this investigation, seven M30 grade concrete mixes—designated M1, M2, M3, M4, M5, M6, and M7—as well as a control mix are produced. The super plasticizer content in cement is 0.75 percent by weight. The maximum and minimum cement replacement rates for GGBS and Metakaolin are 5% and 10%, respectively. 20%, 40%, and 60% of copper slag are replacement values. Acid attack, water absorption, sorptivity, and porosity are a few examples of properties that contribute to workability and durability. The flexural behaviour of an RCC beam is examined. In terms of RCC beam behaviour, the mixture of MC4 with 5% GGBS, 5% MK, and 40% copper slag offers the highest flexural toughness rating. Due to copper slag's low water absorption rate, concrete can progressively increase in strength by up to 40%. Of the seven, the MC5 mixture is the toughest. Because of the high surface area and pozzolanic activity of GGBS and metakaolin, mix MC5 has the lowest water absorption, sorptivity, and porosity values of all the mixes. The most acid resistance is found in the MC2 mixture, which contains 20% copper slag, 5% GGBS, and 5% metakaolin. This is true for both hydrochloric acid and sulfuric acid.