It investigated the influence of superplasticizer on anti-carbonation property of different strength grade concrete with seven kinds of polycarboxylate superplasticizer. The results indicated that concrete carbonation property would be more impacted by superplasticizer for low-strength concrete. With the growth of the concrete strength, the impact gradually decreased. The anti-carbonation property of concrete could be improved by using an appropriate amount of compound mineral admixtures or lowing water-binder ratio.
The influence of stone dust content and Methylene blue (MB) of manufactured sand, the binder content on workability of self-compacting concrete were investigated. Self-compacting concrete viscosity relational model was built with Design-Expert7.0 software. The results indicated that MB and stone dust content of manufactured sand were important indexes for the workability of self-compacting concrete prepared by manufactured sand. While MB<1, stone dust in manufactured sand will help to improve workability of self-compacting concrete, but the content should be less than 15%; while MB ≥ 1, the workability of f self-compacting concrete was sensitive to the change of stone dust content and the content must be less than 5%.
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