Proportioning of Concrete Intredients

Ingredients for concrete are cement, fine aggregate, coarse aggregate and water. The best concrete can be obtained by mixing the ingredients in correct proportions. The ideal proportion of concrete will be that, which produces greatest strength and solidity at the least cost. In estimating the quantities of ingredients for cement concrete it should keep in mind that voids of coarse aggregates are filled up by sand and voids of fine aggregates are filled up by cement. The concrete mix of 1: 1: 2 and 1: 11/2: 3 are mostly used for water retaining structures. The concrete mix 1: 2: 4 is most commonly used for R.C.C. construction.