Okere, Chinenye E.
The need for alternative building materials to reduce cost and other environmental issues necessitated this work with locally available laterite, saw dust ash (SDA) and rice husk ash (RHA) obtained from agricultural and plant wastes. A total of 216 hollow blocks of size 450mm x 225mm × 150mm were produced using a mix ratio of 1:6 with water cement ratio of 1.0. SDA and RHA were used separately and in equal proportions to partially replace Ordinary Portland Cement (OPC) using percentage replacement levels of 0%, 5%, 10%, 15%, 20%, and 25%. The blocks were cured for 7, 14, 28 and 60 days and the compressive strength obtained at these ages. The results gave an optimum percentage replacement at 10% with equal proportions of SDA and RHA with compressive strength values of 2.29N/mm2 , 2.34N/mm2 , 2.39N/mm2 , 3.09N/mm2 at curing ages of 7, 14, 28 and 60 days respectively. When considered separately, SDA with OPC gave a higher strength value of 2.31N/mm2 at a curing age of 28 days than RHA with OPC which gave a strength of 1.93N/mm2 . The variation of the strength with age is linear, showing that the strength increases with curing age. The compressive strength values at these specified points are greater than the recommended value by Nigerian Building and Road Research Institute (NBRRI) and Nigerian Industrial Standard (NIS). Read full PDF
Keywords: Compressive strength, laterite blocks, saw dust ash, rice husk ash, partial replacement, pozzolanic materials
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