COMPARATIVE STRENGTH OF PARTIALLY REPLACED RICE HUSK ASH WITH CEMENT MORTAR A CASE STUDY OF OBUBRA L.G.A OF CROSS RIVER STATE
Akwapoly Journal of Communication and Scientific Research (APJOCASR)
Keywords:
Rice Husk Ash (RHA), Ordinary Portland Cement (OPC), Compressive Strength, Flexural Strength, Water AbsorptionAbstract
The paper assesses and compares the strength of cement mortar that is partially replaced with rice husk ash (RHA). The primary objective of this study is to evaluate the feasibility of using RHA in construction projects as a cost-effective and sustainable alternative to traditional cement-based mortar. The study also seeks to address the pressing environmental issues associated with the disposal of agricultural waste. The study results expect to provide valuable insights into the potential benefits and drawbacks of using RHA in construction projects, particularly in terms of its impact on the durability, strength, and overall quality of the mortar. The idea is to generate wealth by selling RHA to potential buyers instead of disposing of it. Samples of RHA are being mixed into the cement mortar at replacement levels ranging from 5% to 25%. A range of laboratory tests is being conducted to evaluate properties such as particle size distribution, compressive strength, flexural strength, bulk density, and water absorption. The results from the laboratory tests show that as the percentage of RHA increases, the density of the RHA with cement mortar decreases from 2.316 kg/m3 to 1.853 kg/m3. Water absorption of RHA with cement mortar increases from 0.45% to 8.1% as the percentage of RHA increases from 0% to 25%. Compressive strength decreases from 23.4 KN/m2 to 7.31 KN/m2, and flexural strength decreases from 3.93 KN/m2 to 0.54 KN/m2. An optimal percentage of RHA with cement mortar is recommended to be between 10% and 15%.
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