The main purpose of this study is to suggest an efficient method for quality control of concrete. In terms of the mix design, the estimating method of compressive strength of concrete is investigated at the stage that mix proportion conditions of production conditions in the materials to be used, batching, mixing and transportation are known (at the stage before mixing or that of fresh concrete).
Through a lot of date analyses of investigation results of concrete tests, it became evident that compressive strength of concrete is greatly influenced by unit cement content, unit water content and other factors. And the estimation equations of compressive strength of concrete were proposed.