Using cassava pit waste as light weight aggregate for hollow load bearing concrete masonry product with moisture content control type

Abstract

This research aims to develop the concrete blocks mixed with cassava pit waste. There are 6 mixing ratios among Portland cement type1: rice hush ash: quarry dust: cassava pit waste: water reducer type A: tap water that include 0.7: 0.3: 10: 0: 0.02: 0.6, 0.7: 0.3: 9.9: 0.1: 0.02: 0.6, 0.7: 0.3: 9.7: 0.3: 0.02: 0.6, 0.7: 0.3: 9.4: 0.6: 0.02: 0.6, 0.7: 0.3: 9.1: 0.9: 0.02: 0.6, and 0.7: 0.3: 8.8: 1.2: 0.02: 0.6 by weight. The concrete block samples were casted same as the ordinary concrete blocks and test were conducted according to TIS.57-1990 standard. From the results, the best proportion of concrete block mixed with coconut shell ash is 0.7: 0.3: 9.7: 0.3: 0.02: 0.6. The proper ratios of cassava pit waste can decrease the density or weight and increase the thermal insulation of concrete blocks. However, the over amounts of cassava pit waste that effected to increase the water absorption and decrease the compressive strength properties of concrete blocks.