From a View of Alkali Solution: Alkali Concentration to Determine Hydration Process of Alkali Activating Metakaolin
With increasing concerns on concept of sustainability from the world, alkali activating binder materials has gained lots of concerns from academy and industry. However, hydration mechanism of alkali activating metakaolin is still not clearly understood. As a key component of alkali activating binder material, role of alkali solution and its action mechanism on hydration of alkali activating metakaolin are reported rarely. The present research studied influence of alkali concentration on hydration process and microstructure formation of alkali activating metakaolin. Penetration resistance, setting time, compressive strength, hydration heat, and scanning electron microscope, were adopted to reveal the hydration process influenced by concentration of alkali solution. Results show that high concentration of alkali solution accelerated hydration process of metakaolin, but over high concentration was resulted in a decreasing trend of compressive strength in the entire age of 60 days.
KeywordsCompressive Strength Alkali Solution Penetration Resistance Water Glass Alkali Concentration
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Authors appreciate the financial supports from the China Postdoctoral Science Foundation under the contract No. 2013M531296, and the Postdoctoral Science Foundation of Jiangsu Province under the contract No. 1301160C.
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