Comparison of Physical Properties on Natural Cement Motor with Alkality

Water used for mixing and curing of concrete or motor should be free from deleterious chemical substances which are likely to exert appreciable influence on hardening and strength development of cement motor or concrete. Most of the ground water available in India possesses more alkalinity than that specified by standard codes. Alkalinity of water indicates thepresence of substances like carbonates, bicarbonates of calcium, magnesium and sodium in water. Hence, the present work is undertaken to examine the influence of chemical substance as calcium chloride, magnesium chloride and magnesium sulphate on hardening andstrength development of concrete structures by considering the various water quality parameters. In order to overcome the failure of structures due to alkalinity of water in natural pozzolona cement various tests has been conducted such as soundness test, initial and final setting time test, and compressive strength at various stages. These results should be compared with both deionized water and the various concentration levels of three acidic substances. If the concentration of CaCl2, MgCl2 and MgSO4 exceeds 1.5-2g/l then the strength at long duration can be decreases.