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Quality of concrete is calculated in terms of its 28days compressive strength. This period is too long for either control of concrete construction or applying timely corrective measures particularly in today's fast construction practices. Curing of concrete and its gain of strength can be expedited by raising the temperature of curing, thereby speeding up of the hydration reaction. Two methods of accelerated curingwarm water method and boiling water method have been covered by IS 9013. The objective of this study is to compare 28 days compressive strength of concrete with accelerated curing methods developed by IS 9013: 2004. One more method of curing in which temperature was increased gradually was also attempted. In order to achieve these, total 48 samples of two different mix proportions were cast and cured by normal water curing for 28 days, and by accelerated curing methods. The reliability of these accelerated curing methods was checked.

The experimental results of a research on plain cement concrete with partial or full replacement of natural sand (fine sand) with manufactured sand produced at stone crusher as a byproduct. Designed concrete mix having proportion as 1: 1.5: 3 with specified properties of concrete as per INDIAN STANDARDS (IS) in experimental study. Concrete cube specimens are tested for evaluation of compressive strength. The concrete exhibits excellent strength with 40%, 60%, 70%, 80% and 100% replacement of natural sand by manufactured sand. This project may play a very important role in the further development in the field of civil engineering. It will help to find viable solution to the declining availability of natural sand to make eco-balance.