Effects of Water-Reducing Admixture on the Compressive Strength of Concrete Using Crushed Mangima Stone as Fine Aggregate

Abstract

Crushed Mangima stone as an alternative concrete aggregate has been studied and found to provide concrete with comparable compressive strength to that of the conventional concrete. This study investigated the effect of water-reducing admixtures in concrete production using crushed Mangima stone as fine aggregate. Waterreducing admixture with a variance of 0.5, 1.0, and 1.5% by weight of cement was added to the concrete mixture. A water-cement ratio of 0.57 was used for this study. Samples were cured at seven, 14, and 28 days and tested for compression after each curing period. The compressive strength of concrete using water-reducing admixtures showed an early strength and passed the minimum requirement of 3,000 psi. Results revealed that through the use of admixtures, compressive strength obtained from all samples was higher than the control mixture. This means that using crushed Mangima stone has its potential to be used as fine aggregate in a structural concrete mixture with the addition of water-reducing admixture