Experimental Study on the Effect of Partial Substitution of Cement Portland on Red Cement against Concrete Compressive Strength

Abstract

Increasing building will impact indirectly to the increased needs of the concrete. Concrete is a material that has long been recognized in general and has several advantages, namely: is planned and set up, high temperature resistant, can be made by the manufacturer, as well as raw materials easily obtainable. The aim of this study was to determine the effect of red cement substitution by comparing the compressive strength of concrete using the K225 with a mixture of red cement. The method used in this study is an experiment with a sample consisting of 45 concrete cylinders size f 150 mm x height 300 mm, which is divided into 5 treatment (composition at 0%, 10%, 20%, 30% and 40%) and were tested in groups age of concrete after printing (7, 21 and 28 days). The results showed that the red cement can reduce the characteristic concrete compressive strength and the higher the percentage increase compressive strength tends to decline, and the addition of up to 20% did not show any significant decrease.

Key words : Concrete, Pozzolan, Substitution, Concrete Depress Strength