Utilization of rice husk ash as an admixture in high-strength concrete
1999
Ishiguro, S. (Mie Univ., Tsu (Japan). Faculty of Bioresources)
Rice husk ash produced by controlled field burning operations were ground in a ball mill for 60 min and used as a partial cement replacement material for high-strength concrete. Several properties such as chemical compositions, specific surface areas, particle-size distributions and X-ray diffraction pattern of the ash were determined. The strength development of the concrete containing up to 45 % rice husk ash by weight of the total cementing material was also investigated. The following results were obtained. (1) The 7-day, 28-day and 91-day compressive strengths of the rice husk ash concrete were higher than those of the control concrete without rice husk ash. (2) The 28-day maximum compressive strengths of the concretes were 54 MPa, 71 MPa and 87 MPa for the concretes with water-cementing material ratio was 50 %, 40 % and 30 %, respectively. (3) The dosage of superplasticizer in concrete increased as the ash content of the cementing material increased
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