Cite the paper
Mechanics, Materials Science & Engineering, 12 (1), 2017, ISSN: 2412-5954.
Authors: Binyamien I. Rasoul, Friederike K. Gunzel, M. Imran Rafiq
ABSTRACT. The objective of this study is to investigate the effects of Rice Husk Ash, with different replacement levels, on the strength and durability of concrete. Three types of rice husk ash with different chemical composition and physical properties were used for this study. Ordinary Portland Cement (OPC) type 52.5 N was replaced with 5%, 10%, 15%, 20%, 30%, 40% and 50% RHA (by weight) for strength test, additional samples with 60% RHA replacement were used for durability experiments. The ratio of water/cementitious material was kept at a constant value of 0.50. Superplasticizer was used to maintain a consistent workability of the fresh concrete. The compressive strength was measured after 7, 28 and 90 days, while splitting tensile strength was obtained at age of 28 and 90 days. The migration coefficient of chloride ion penetration was evaluated using non-steady-state migration tests  at 28 days age. The results revealed that the RHA properties (silica form, fineness, silica percentage and loss on ignition) have a direct impact on the development of strength at long-term age . Experiments showed that even with 50% replacement of OPC with RHA, concrete has a higher strength and durability performance compared to OPC concrete. This may be attributed to the fact that increasing replacement ratios of RHA leads to a reduction in porosity, which in turn increases the strength and durability of concrete.
Keywords: concrete strength, durability, chloride ion, non-steady-state migration test, rice husk ash, pozzlanic activity
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