Nano SiO2 can improve the strength of fly ash composite cement,promote the hydration of cement and reduce micro pores.However,due to the complex synergistic effect of fly ash and nano SiO2,in order to study the mechanism of nano SiO2 modified fly ash composite cement,the compressive strength of fly ash composite cement cured for 28 days was tested,and micro characterization was car-ried out by means of SEM,XRD and mercury intrusion method.The results show that nano SiO2 can effectively improve the strength of fly ash composite cement,refine its pore structure,and increase the proportion of less harmful pores and harmless pores in cement.
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