Effect of trass substitution in sand on the compressive and flexure strength of concrete

Abstract

The existence of limitations in the supply of sand as a concrete material requires an alternative. On the other hand, the potential trass in Rembang is quite abundant and has not been utilized optimally. This study utilizes the potential of trass ex. Rembang is a substitution of sand in concrete with compressive and flexural strength as test parameters. Concrete with a design quality of 33 MPa is made from the split, cement, water, and sand substituted with trass 0,20,40,50,60,80, and 100% of the weight of sand in cylinders 15/30 cm and beams 15x15x60 cm. The concrete was treated with wet burlap and tested at the 3, 7, 14, 28, and 90 days in compression also 7 and 28 days in flexure. The test results show that the presence of trass in the concrete reduces the concrete compressive strength by 17% until 42% of the concrete compressive strength without trass. Moreover, the flexural strength decreases by 7% to 23%. Concrete using a fine aggregate in the form of trass (100% trass) has increased compressive strength with increasing age of the concrete, but with a compressive strength of 36% lower than the compressive strength of concrete with sand as the fine aggregate.