The impact of different of coarse aggregate size on the strength and performance of concrete using locally available materials

Abstract

This study examined coarse aggregates of various sizes and their effect on the compressive strength of concrete. This study was taken by the consideration of different locally available materials in Madura Island. Those materials were damaged to varying degrees due to inadequate selection and handling of the coarse aggregate, which makes up the majority of the concrete material. In Madura, most of the construction using those type of aggregates which only reached the compressive strength capacity less than 20 MPa. In this study, two concrete samples were prepared, CS1 and CS2 using two combination of coarse aggregate sizes, 5 mm – 10 mm and 10 mm – 20 mm with ordinary Portland cement and natural river sand as the fine aggregate and polymer admixture to keep workability. Specimen control of each condition were also prepared. The water-cement ratio of 1: 2: 4 and 0.55 was maintained throughout the study. Targeted concrete slump flow is 60 ± 5 mm. After 28 days of curing, the compressive strength test of a 300 x 300 mm concrete cylinder showed the highest compressive strength of 33.28 MPa for CS1, followed by 36.10 MPa for CS2. These different compressive strength properties are the result of coarse aggregate resizing, thus determining the effect of coarse aggregate size on concrete. Furthermore, the size of coarse aggregate does not affect significantly on the performance of the concrete.