The Influence of Palm Shell as Aggregate Substitution to The Compressive Normal Concrete Strength

Abstract

The main objective of this paper was to study the influence of palm shell used as aggregate substitution to achieve structural concrete with lighter weight than normal concrete. Instead of normal aggregate, the alternative aggregate palm shell was used with variation of substitution consisting of 0%, 15%, 30%, 35% and 65% of palm shell by weight of aggregates. Water-cement ratio was 0.40 of and f’c 30 MPa. The test result conducted on the 28th day showed that the strength was increased. However, as the Palm Shell percentages increased, the compressive strength decreased. The normal concrete (0%) of palm shell was resulted 46.188 MPa of strength and the substitution of 15%, 30%, 45% and 60% was 42.917 MPa, 23.287 MPa, 18.860 MPa and 8.468 MPa. There was a reduction in the strength at 0% substitution compared to 60% substitution, and it occurred reduction weight of concrete with 0%, 15%, 30%, 45% and 60% substitution of palm shell that gave result 2528 kg/m3, 2359 kg/m3, 2053 kg/m3, 1990 kg/m3 and 1809 kg/m3 concrete weight. As a result, it shows that the concrete using 0% of palm shell substitution can be categorized as a high strength concrete for 60% substitution palm gave non-structural concrete with lightweight concrete.