Study on the Control of Alkali-aggregate Reaction on Concrete by Adding Rice Husk Ash (I)

Abstract

In this study, the control of alkali-aggregate reaction on concrete was attempted by adding rice husk ash to mortar containing one of reactive aggregates. Three experiments were carried out and the following results were achieved.
1) Adding rice husk ash to mortar by over 7% of cement weight made the control of alkali-aggregate reaction possible.
2) Extracted liquid, obtained by either boiling or immersing rice husk ash in distilled water was added to mortar. This method was unsuccessful in controlling the expansion of mortar bar.
3) Extracted solid, obtained by boiling rice husk ash in distilled water was added to mortar.In this case an expansion controlling effect was also observed by over 7% of cement weight.