Abstract

Devesh K. Sharma* and  Rekha Sharma

DOI : http://dx.doi.org/10.13005/ojc/310164

The paper compared the effect of additives such as FeSO₄.2H₂O and SnCl₂.2H₂O on reduction of water soluble Cr(VI), in ordinary Portland cement (43 grades). The determination of water soluble Cr(VI) from cement samples was precisely conducted by DPC-Spectrophotometer technique. The compressive strength testing of the cement mortar samples was carried out. In addition, hydration properties of cement paste (with and without additives) are reported in this paper. Hydration products were also studied in detail by TGA, SEM and XRD.  Tin chloride was found to be the most efficient additive for reducing Cr(VI) in cement. XRD confirmed two phases such as monocarbonate and Friedel’s salt (at 2θ = 11.5) were formed during cement hydration in the presence of tin chloride but not confirmed the presence of calcium hydroxo-stannate. These studies showed significant retardation in early days hydration.

Cr (VI); Spectrophotometer; TGA; SEM; XRD; compressive strength

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