Abstract
The objective of this study was to investigate the microstructure and mechanical properties of a high-calcium fly ash geopolymer prepared with borax modified by the addition of rice husk ash (RHA). The sodium silicate was replaced with borax, on an equal mass basis, at 0, 10, 20, and 30%. The results showed that the use of borax instead of sodium silicate reduced both the compressive and flexural strengths. The strength decreases when borax was used were related to the increase in the crystalline nature of the reaction products caused by the decreases in the Si/Al ratios of the gel phases formed. Moreover, incorporating 3.6–6.0% RHA into geopolymer mortars containing either hydrated borax or anhydrous borax led to an improvement in the compressive strength due to the formation of a Ca-modified N-A-S-H gel with a high Si/Al ratio during the reaction.
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