| Abstrakt: |
Ultra-fine cement and nano-silica (NS) are used to prepare high-performance cementitious composite materials (hereinafter referred to as composite materials) to solve the problems of low strength and poor fluidity of cement-based cementitious materials. The orthogonal test is used to determine the flow of composite materials. Tests on properties and strength are carried out. The influence of water to binder ratio, micro-silica fume, fly ash, nano-silica and water reducing agent on the fluidity of composite materials and the mechanical strength of different ages are studied, and the test results are analyzed. The results show that the content of micro-silica fume and water to binder ratio have the most significant influence on the composite material, the content of fly ash and NS are more significant, and the water reducing agent has little effect on the performance of the composite. Under the premise of comprehensively considering the fluidity and the strength of different ages, the optimal ratio is obtained as the water to binder ratio 0.34, microsilica 10%, fly ash 30%, NS 3.5%, and water reducing agent 2.0%. [ABSTRACT FROM AUTHOR] |
