Study on the Properties of Nano-CaCO3 Modified Large Amount of Zeolite Powder Concrete
In order to study the performance optimization effect of nano-CaCO3 on large amount zeolite powder concrete,HPC was prepared by single-doped zeolite powder,multi-doped zeolite powder and NC modification,respectively.The effect and mechanism of NC on the performance of large amount zeolite powder concrete were studied by working performance,mechanical properties,chloride ion permeability resistance and microstructure.The results show that when the amount of zeolite powder is 20%,the 7 d,28 d and 90 d compressive strength of HPC is 89.52%,97.60%and 101.07%of benchmark group,respectively,and the splitting tensile strength is 92.65%,99.85%and 102.62%of benchmark group,the chloride ion permeability resistance is 5.64%higher than that of the benchmark group.After adding NC on this basis,the negative impact of zeolite powder concrete is improved,and the chloride ion permeability is further enhanced.When NC content is 1.0%,compared with HPC without NC,the 7 d,28 d and 90 d compressive strength is increased by 12.34%,8.90%and 5.91%,respectively,the splitting tensile strength is increased by 14.76%,11.30%and 7.95%,and the chloride ion permeability is increased by 20.92%.NC could promote the hydration reaction of zeolite powder cement system,optimize the morphology of hydration products,refine the pores of slurry structure,and improve the compactness of concrete.When the content of zeolite powder is 20%and the content of NC is 1.0%,the properties of large amount of zeolite powder concrete reach the optimal level.
large amount of zeolite powder concretenano-CaCO3mechanical propertiesresistance to chloride ion penetrationmicrostructure
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