Mechanism of Interface Bonding Between Alkali-Slag-Metakaolin Based Geopolymer and Aggregates
Geopolymer concrete,formed through alkaline activation,has an internal alkaline concentration of dozens times higher than that of cement.Therefore,the reaction properties between geopolymers and aggregates need to be explored further.This work discussed in detail the influence of different mix ratios and aggregate types on the interface bonding strength of the alkali-slag-metakaolin based geopolymer and aggregate.Mi-croscopic analysis methods were used to elucidate the interface bonding mechanism.The experimental results showed that under the conditions of an alkali module of 1.2,and a liquid-to-solid ratio of 0.4,the samples with granite,basalt,and limestone respectively got the highest bonding strength.As the modulus of the alkaline activator and the liquid-to-solid ratio increased,the bonding strength of the interface decreased gradually;however,the bond strength between the geopolymer and granite was not significantly affected by the alkalinity of the activator.Under the action of the alkaline activator,three kinds of aggregates underwent dissolution reactions,and the dissolved active Si,Al,and Ca elements should react with the geopolymer further at the interface,which should improve the compactness of the ITZ.
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