K. FATEMA1, M. A. SARKER2, A. HABIB3 and M. A. ALAM4
1=Kaniz Fatema, Research Fellow, Housing and Building Research Institute, Dhaka-1216, 2= Md. Akhter Hossain Sarker, Principal Research Officer, 3= Ahsan Habib, Senior Research Officer and 4= Md. Ashraful Alam, Director General (DG), Housing and Building Research Institute, Dhaka-1216 and Bangladesh.
ABSTRACT
The experiments were conducted at Housing and Building Research Institute, Dhaka, Bangladesh during 2020. Wastage and unused dredged sand turn into national wealth it is properly utilized. The goal of this study is to use dredging sand as raw materials for producing eco-friendly Sand Cement Solid block. Along with a small ratio of Portland composite cement (16-28) % and negligible amount of super plasticizer 200 ml by weight of Cement have been used. In this study the effect of single use of high range of super plasticizer and the effect of water cement ratios of sand cement block were determined. The Water Cement ratios were maintained of this block is (0.25-0.28). These blocks were cured by spraying water on the specimens three times daily for 7, 14 and 28 days to observed the ultimate compressive strength, water absorption and efflorescence test of blocks. The test results showed these for the optimum water-cement ratios and optimum dosage of super plasticizer increased (66.07%) in compressive strength than that of normal and other concrete block mix. However Compressive strength were improved by dosage of 200 ml super plasticizer per bag of cement after 28 days curing is increasing compressive strength 9430 psi (65.03MPa) which is higher than that of normal concrete. From the perspective of cost and benefit, we have calculated that it outright cost-effective and environment gets enormous benefit. This new, effective idea and solution can certainly lessen the problem of dredging sediment disposal and produce eco-friendly construction materials.
Keywords: Sand cement solid block, Super plasticizer, Compressive strength, Water absorption and High strength block.