Alternative of stone ash as a sand replacement in fc’40 mpa quality concrete mixture on pressure stress

Abstract

Stone ash is the result of breaking stone by using a stone crusher. Stone ash is currently a by-product in the industry the amount of stone is not small. At present stone ash is not very salable for sale because the use in the construction industry is very little considering the use of sand as fine aggregate is still used for concrete mixtures. The method used in this study is a reduction in the amount of sand used in the concrete composition replaced with stone ash. Where the percentage of the use of stone ash is determined at 5%, 10%, 15% and 20% of the amount of sand, using concrete quality Fc’40 Mpa. From this study, it is known that the more mixed the ash, the lower the compressive strength. Each 5% increase in the proportion of rock ash mixture to the weight of sand results in a decrease in strength. For 0% of stone ashes produce Fc’ = 40.17 MPa; 5% of stone ash produces Fc’ = 39.37 MPa; 10% of stone ash produces Fc’ = 38.32 MPa; 15% of stone ash produces Fc’ = 37.38 MPa; 20% of rock ash produced Fc’ = 36.8 Mpa. From the research carried out the addition of rock ash more than 5% decreased the concrete compressive strength required because by using a mixture of 5% stone ash, the compressive strength of concrete only reached 39.37 Mpa.