Recycling Blends of Rice Husk Ash and Snail Shells as Partial Replacement for Portland Cement in Building Block Production

James Ransford Dankwah, Ebenezer Nkrumah

Abstract


This project was experimentally carried out to investigate the effect of Rice Husk Ash (RHA) and Calcined Snail Shell (CSS) as a partial replacement for Ordinary Portland Cement (OPC) on the formation of building blocks in the absence of chemical activation. A total of 24 building blocks of size 100 mm x 70 mm x 50 mm with different percentages by weight combination of 20 % RHA and 80 % CSS were used for the investigation. The percentage partial replacement of OPC was in the order of 0 %, 5 %, 10 %, 15 %, 20 %, 25 %, 30 % and 50 %. A ratio of one part of cement to three parts of sand was used to form the blocks. The blocks were tested at age 7 and 14 days for compressive strength. Test results indicated that the blocks formed were above the standard compressive strength of 3.5 N/ according to American Society for Testing of Materials (ASTM). Compressive strength of the blocks also increases with age at curing and generally decreases as the percentage of RHA and CSS content increases. The study arrived at an optimum replacement level of 25 % of cement in forming the building blocks.

Keywords


Rice Husk Ash; Calcined Snail Shell; Ordinary Portland Cement; Building Blocks

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References


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