A Study on the Development of the Mix Design System for High-Strength Concrete

The main objective of this study is to develop the rational mix design system of high-strength concrete which is adjusted in the domestic circumstances. For this purpose; 1) Collect a lot of data in order to introduce the relationship between the material variables which influence the properties of high-strength concrete and the multi-variate statistical analysis was done by using computer program Statistical Analysis System (SAS). 2) Select the important material variables for mix design of high-strength concrete by major component analysis and propose the standard range of each material variables. As the results, it was proposed the proper range of material variables, which are water-combine rate, fine aggregate ratio, air content, and dosage of admixture, etc., at the target strength of for Plain and Flyash concrete. And the relationship between the different variables are formulated into equations. A computer program was developed for proportioning the different ingredients of concrete using the derived equations.