The mechanical properties of limestone as an aggregate on high strength concrete

Abstract

The construction of multi-stories buildings is increasing rapidly. In concrete construction, various studies and innovations have been carried out in order to obtain high strength concrete. The use of limestone either as a substitute for fine aggregate, as a substitute for coarse aggregate or as a substitute for fine aggregate and even coarse aggregate in a concrete mixture is still lacking. In South Sulawesi, large quantities of limestone are found in several regencies. Enrekang Regency is one with considerable limestone potential which is about 74.75 km2 or an estimated geological of 3.7 billion cubic meters. Most limestone is made into split stones that can be used as construction materials. Limestone can be processed into split or powder which can be used as a replacement for sand in concrete mixture. The results of the concrete at 28 days with a mixture of natural sand as fine aggregate and limestone split as coarse aggregate, w/c ratio of 0.20 produced a value of f’c = 59.26 MPa. ft = 4.51 MPa (0.61 √f’c), and fr = 7.18 MPa (0.93 √f’c). The average modulus of elasticity at 28 days with a mixture of limestone powder as fine aggregate and limestone split as coarse aggregate produced a value of Ec = 46960.25 MPa (6325 √f’c) with Poisson’s ratio υ = 0.3847.