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

This research aims to study the using rock fragments of basalt mining to develop paving block product. The mixture ratios of Portland cement type1: basalt rock fragments: tap water are 1 : 4 : 0.45 1 : 4.5 : 0.45 1 : 5 : 0.45 1 : 5.5 : 0.45 and 1 : 6 : 0.45 by weight. The paving block samples are cast in 30 x 30 x 5 centimeter in dimension. The paving block sample testing follows the TIS 378-2531 on concrete flooring tiles. From the experiment bending strength of paving blocks with high quantity of basalt rock fragments is lower than paving blocks with low quantity of basalt rock fragments but the water absorption of paving blocks with high quantity of basalt rock fragments are higher. However all of basalt rock fragments paving block samples with lower than 1 : 5.5 : 0.45 of ratio can pass the standard.