Abstract
This paper reports the effect of Magnesium chloride (MgCl2) on Ordinary Portland Cement (OPC) concrete. The OPC concrete was produced with MgCl2 dosage of 0.2, 0.5, 1.0, 1.5 and 2.0 g/lit and deionised water was used in concrete mix (M20 & M50). In addition to this, control specimens were prepared with deionised water (without MgCl2) for comparison. The compressive and tensile strengths were evaluated for 28 and 90 days. The results show that, as the MgCl2 concentration increases, the compression and tensile strengths decrease. The X-ray diffraction analysis for concrete has been carried out at 1.5 g/lit concentration. Keywords: Portland cement, concrete
Highlights
The chemical impurities of industrial effluents can impose deleterious effect on concrete
Average compressive strength of three cubes and split tensile strength of three cylinders prepared with different concentrations of MgCl2 is compared with that of three similar specimens prepared with deionised water
Initial setting time gets retarded with increase in magnesium chloride concentration and it is significant from 1.5 g/l concentration onwards
Summary
The chemical impurities of industrial effluents can impose deleterious effect on concrete. MgCl2 concentration increases, the compression and tensile strengths decrease. Venkateswara Reddy et al (2006) studied the influence of strong alkaline substances (sodium carbonate and bi-carbonate) in mixing water on strength and setting properties of concrete. There is need to assess the effect of magnesium chloride presence in the water in various concentrations on setting times of cement and strengths of concrete.
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