Abstract: To investigate the impact of synergistic effect between limestone powder and supplementary cementitious materials containing aluminate phase on carbonation resistance of concrete, two kinds of supplementary cementitious materials containing aluminate phase and limestone powder were selected to replace cement in different proportion, and the hydration products and microstructure were measured by thermogravimetric analysis, XRD and mercury intrusion porosimetry. The results showed that incorporation of limestone powder reduce the carbonation resistance of concrete. The carbonation depth of concrete was minimal when the content of limestone powder was approximately 10%. However, when limestone powder and supplementary cementitious materials containing aluminate phase were mixed, they reacted to form calcium carboaluminate, which increase the volume of solid phase, optimize the pore structure, and their synergistic effect improved the carbonation resistance of concrete. When the limestone powder amount was 5%—15%, and the fly ash amount was less than 10% or the slag amount was 10%—30%, the carbonation depth of concrete was lowest.
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