Abstract
In this paper, the acid attack test is conducted on M30 grade concrete with industrial wastes. Here in this study, GGBSand metakaolin are partially replaced for cement and copper slag is replaced for sand. The simultaneous replacement ofthese materials is done in each mix. Totally five mixes were prepared including controlmix. GGBS and metakaolinreplacement vary from 5% to10% in successive mixes. Similarly the copper slag replacement ranges from 20 to 40%. Twotypes of acids such as Sulphuric Acid, Hydro chloric Acid with 1%concentration are used at 28 days immersion. From theresults, it is observed that the percentage loss of weight is least for the mix containing 5% GGBS, 5% Metakaolin and 20%copper slag. And also for the same mix, the compressive strength of 28 dayssulphuric acid curing is11.07% higher thanthe concrete with 28 days water curing. Similarly in hydro chloric acid immersion, the compressive strength of concrete is2.24% higher than the concrete with 28 days water curing. The reason for the acid resistance of concrete is the combinedeffect of GGBS, Metakaolin and copper slag.
Highlights
The concrete exposed to acid environment has deterioration due to acid attack
The weight loss of specimen immersedinsulphuric acid after 28 days is decreased up to 20% copper slag replacement
The maximum weight loss is obtained for the mix containing 10% GGBS, 10% Metakaolin and 40% copper slag replacement
Summary
The concrete exposed to acid environment has deterioration due to acid attack. It is observed from that the residual compressive strength of 10% metakaolin concrete at acid environment is higher than control concrete. This is attributed to more and more formation of ettringite[2]. The best acid resistance is achieved for the concrete mix with 40% GGBS due to its pozzolanic action which modifies micro structure. This will result to fill voids and produce low heat of hydration which improves durability of concrete. About 1.5% mass gain is obtained by the concrete with high proportion copper slag due to continued hydration of cement, formation of gypsum and increase absorbed water in mix. The copper slag concrete has better acid resistance than controlconcrete[13,14,15]
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