Community Technology for Development of Concrete Block Product from Basalt Fragments
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This research aims to test the properties of concrete block mixed with basalt fragment as aggregates in products. The mix ratios of Portland cement type1 : basalt fragment : water are 1 : 10 : 0.7, 1 : 10.5 : 0.7, 1 : 11 : 0.7, 1 : 11.5 : 0.7, and 1 : 12 : 0.7 by weight. The concrete block samples were mixed and casted in 7 x 19 x 39 centimeter by the concrete block molding machine. The concrete block sample testing follows the TIS 58-2533 standard on non-load bearing concrete blocks. From the results, the density, compressive strength, and thermal conductivity of concrete block mixed with basalt fragment are lower than the common concrete block. In addition, the water absorption and volumetric change are higher than the common concrete block. The optimal ratio in this work is 1: 11: 0.7.