Abstract
The aim of this study is to observe the concrete resistance towards acid attack. This is studied on M40 grade concrete, inwhich 5% by weight of binder is replaced with metakaolin and fine aggregate is replaced partially with the range of 5 to20% by marble sludge powder and green sand simultaneously. Four different mixes other than control mix is taken for thisstudy. The 100mm cubes are casted, cured and average compressive strength is compared with conventional concreteand those cured under two different acids. The two different acids taken for this study are Hydrochloric Acid and SulphuricAcid. The average percentage loss of weight and average compressive strength of cubes before and after two differentacids for all the mixes are investigated. From the experimental results, it is inferred that the control mix when cured underboth 1% concentrated HCl and H2SO4 solutions showed a high loss in weight comparing with modified concrete. Theincrease in marble powder and green sand upto 10% by weight of fine aggregate gives high reduction in loss of weight.The mix with 10% marble powder and green sand offered comparatively better solutions insisting the concrete modifiedwith the same can be recommended for making good and acid resisting concrete.
Highlights
The constituents together to make homogenous concrete will have alkaline property
The concrete was modified for its partial amount of fine aggregate by marble sludge powder and green sand to improve the performance against acid attack and 5% by weight of binder is replaced by metakaolin to enhance the pozzolanic activity throughout the study
The percentage loss in weight decreases with increase in partial replacement of green sand and marble powder
Summary
The constituents together to make homogenous concrete will have alkaline property. The consistency of the cement paste gets deteriorated when it is subjected to acidic environment. This marble sludge powder when used in concrete increases workability with reduced permeability resistant to acid attack. Using optimum of 7.5% by weight of cement high reactivity metakaolin increases strength resistance to sulphate attack of concrete [5]. Concrete resists acid attack when modified with 15% metakaolin and 20% silica fume replaced for weight of binder [6]. The optimum use of 15% by weight of binder replaced with metakaolin offered better resistance to acid attacks [8]. The concrete was modified for its partial amount of fine aggregate by marble sludge powder and green sand to improve the performance against acid attack and 5% by weight of binder is replaced by metakaolin to enhance the pozzolanic activity throughout the study
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