Abstract: The deterioration of concrete performance caused by manufactured sand with clay has become an urgent problem to be solved in concrete industry. Silicon-based waterproofing agent and clay anti-swelling agent were used as the two-component surface modifier. The modifier was applied to pretreat the surface of manufactured sand, which can improve the working performance of concrete with clay. The effects of the type and amount of modifier on the water absorption and methylene blue value (MB value) of manufactured sand, as well as the relationship with the adsorption amount of superplasticizer and the spacing between clay layers were investigated. The influence of surface modification treatment on the rheological behavior of mortar, the working performance, mechanical performance and durability of concrete was studied. For the two-component modifier, the optimal mass ratio of water-proofing agent and anti-swelling agent was 6∶4, and the optimal dosage was 1.5‰ of the quality of the manufactured sand. After surface treatment, the water absorption of manufactured sand was reduced by 42.3% and MB value decreased from 3.2 to 1.5. The dosage of superplasticizer can be reduced by 5.7%—14.3%, and the slump flow of 1.5 h can be increased by 70—120 mm. The results show that the surface modification technology can improve the fluidity and retention of the concrete and enhance the mechanical perfor-mance and durability of the concrete,and also reduce the fluctuation of concrete working performance caused by the variation of clay content and clay species.
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2021, Vol. 35 
