The Resistance of Rice Husk Ash Concrete to Carbonation, Acid Attack and Chloride Ion Penetration

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Title: The Resistance of Rice Husk Ash Concrete to Carbonation, Acid Attack and Chloride Ion Penetration

Author(s): Shuichi Sugita, Qijun Yu, Masami Shoya, Yoichi Tsukinaga and Yasuo lsojima

Publication: Special Publication

Volume: 172

Issue:

Appears on pages(s): 29-44

Keywords: Acid resistance; carbonation; gels; penetration tests; pore size distribution; strength

Date: 12/1/1999

Abstract:
It was found that highly reactive rice-husk ash (RHA) with more than 40 m2/g BET specific surface could be obtained by the two-step burning method. In this study, concrete specimens with different RHA blending ratios were prepared at different water-cement ratios, then cured in water, 2% HCl solution, and an accelerated carbonating chamber respectively. The results show that after the addition of RHA to the cement not only the strength of concrete is enhanced greatly but also the losses of mass and strength of the concrete cured in the HCl solution and the carbonation rate of concrete were decreased. It was also observed that the resistance of concrete to the penetration of water, air, and chloride-ion can be much improved by using RHA.