Abstract
This paper studies the effect of metakaolin mixed with fly ash on the compressive strength of concretes. The results show that in order to improve the property and reduce the price of metakaolin, metakaolin can be used with fly ash together, and the optimal content of metakaolin in concrete is not bigger than 10%. The content of metakaolin affects the early compressive strength of fly ash concrete significantly. When the water-bind ratio is 0.31 and the amount of metakaolin and fly ash is 35%, which the metakaolin content is 8%, the compressive strength can increase up to 54MPa; when the mixed additive and metakaolin are 25% and 8%, the compressive strength reaches 68MPa.
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