Effect of Different Types of Coarse Aggregates on Strength of Concrete

Abstract

Different types of coarse aggregates have distinguished petrological, petrographical and mineralogical and local characteristics, thus, their effects on concrete strength development are quite significant, various and unpredictable. So, the laboratory investigation on the concrete mixtures using local aggregates becomes very necessary before used in engineering practice. This paper carried out the evaluation of two types of coarse aggregates constantly used in Florida, including Miami Oolite limestone and Georgia granite, on their effects on the developments of compressive strength, splitting tensile strength and elastic modulus of concrete with time. And the prediction models based on ACI and Cario-Lew are evaluated and modified. The investigation results indicate that the concrete mixtures with Georgia granite aggregate tends to develop lower strength than those with Miami Oolite aggregate. And the modified models give better prediction on strength development of the concrete mixtures with aggregates often used in Florida.