Pore Structure Evolution Characteristics and Strength Prediction of Polymer Cement-based Composites Modified by Nano-SiO2
LI Kan1,*, WEI Zhiqiang2, LU Chenggong3, PU Yu1
1 School of Civil Engineering, Lanzhou Institute of Technology, Lanzhou 730050, China 2 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 3 School of Civil Engineering and Transportation, Guangzhou University, Guangzhou 510006, China
Abstract: In order to improve the hydration rate of polymer cement-based materials, nano-SiO2 was added to prepare polymer cement-based compo-sites modified by nano-SiO2. For the sake of clarifying the relationship between the strength and the porous structure of different-scale pores, the effects of nano-SiO2 on the hydration process, compressive strength, pore structure characteristic parameters, pore volume and pore diameter distribution of polymer cement mortar were firstly investigated. Secondly, the relationship between compressive strength and pore diameter distribution and pore volume parameters were further discussed. Finally, multiple regression analysis was used to establish a quantitative relationship model between compressive strength and pore diameter distribution and pore volume. The results show that the strength of polymer cement mortar modified by nano-SiO2 specimens is higher than that of polymer cement mortar specimens in the early and late stages. In addition, the average pore diameter and medium pore diameter are reduced, and the most probable pore diameter is reduced, the proportion of macropores and capillary pores is greatly reduced, the proportion of transition pores is increased, and the proportion of gel pores is not changed much, so that the pore structure of modified mortar is greatly refined. According to the regression analysis, for the pore diameter distribution parameters, the correlation between the average pore diameter and compressive strength is the highest. The pore structure prediction model considering both pore diameter distributionand pore volume can accurately predict the strength of polymer cement-based composites modified by nano-SiO2.
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2025, Vol. 39 
