Fused Laterite Powder Substitution for Cement in Concrete Production
The high cost of cement affects the cost of concrete and hence reduces housing delivery. Research has established that the use of supplementary cementitious materials can improve the strength and reduce the cost of concrete. Fused laterite, a hard-pan formed from lateritic materials contains high silica and lime contents. Silica is known to prolong the setting time and hence, increase the strength of concrete. Fused laterite abounds in Ghana and its use can reduce the cost of concrete. This study purposed to find the compressive strength of concrete from partial replacement of cement with fused laterite powder (FLP). Lumps of fused laterite were ground to fine powder. Two concrete cubes were produced from five batches of concrete with FLP replacements of 0%, 10%, 20%, 30% and 40%; using 1:2:4 mix ratio and water/cement ratio of 0.55. The average 28-day compressive strength for the various replacements were 21.74 N/mm 2 , 22.46 N/mm 2 , 18.49 N/mm 2 , 16.02 N/mm 2 and 14.10 N/mm 2 for 0%, 10%, 20%, 30% and 40% respectively. It was concluded that FLP replacement of 10% produced the optimum compressive strength that was 3% higher than the strength of the cement-only control sample, and hence should be adopted for structural concrete production.