Some Properties of Concrete with Highly Active Rice-Husk Ash


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Title: Some Properties of Concrete with Highly Active Rice-Husk Ash

Author(s): H. Yamamichi, F. Qingge, M. Shoya, and S. Sugita

Publication: Special Publication

Volume: 212


Appears on pages(s): 891-906

Keywords: concrete; durability; rice husk ash; strength property

Date: 6/1/2003

In this study, some basic characteristics of the concrete incorporating the highly active rice-husk ash (RHA) such as compressive strength, freezing and thawing resistance, carbonation, and water permeability wereinvestigated. The results show that with different percentage of RHA to the cement, the compressive strength of concrete increased both at normal and at low water-hinder ratio, especially at low water-binder ratio. The freezing and thawing resistance and water permeability of concrete incorporating 10 and 20% RHA improved significantly, although the carbonation showed the promoted tendency. Furthermore, the analysis of consumed Ca(OH)2 in the hardened RHA mortar by the thermogravimetric analysis (TG-DTA) was used in evaluating the maximum percentage for use of the highly-active RHA for use in concrete. At the same time, the upper limit to the RHA percentage in concrete was determined.