Study on the Effect of Concrete Pore Structure Characteristics on the Mechanical Properties Under Cryogenic Conditions
CHENG Linian1,2, LIU Juanhong1,3,4,*, ZHOU Dawei1, GUO Lingzhi1, CHEN Deping1
1 School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 School of Architecture and Civil Engineering, Huangshan University, Huangshan 245041, Anhui, China 3 Research Institute of Urbanization and Urban Safety, University of Science and Technology Beijing, Beijing 100083, China 4 Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract: High-performance concrete has a broad future application prospect as all-concrete LNG storage tanks, lunar surface bases and other special engineering constructions. In this work, the evolution of macroscopic mechanical properties, microscopic pore structure, and pore water freezing behavior of concrete were investigated, various types of pore structures were analyzed using fractal dimensions, and established the relationship between porosity, relative strength increment, and fractal dimensions. The results show that when the temperature decreases, the strength increases, and the higher the water-to-binder ratio, the higher the strength increase;porosity decreases with the increase of water-to-binder ratio, and the pore structure of the composite cementitious material’s net slurry is primarily composed of small pores under 50 nm. The fractal dimension is linearly correlated with porosity, while the fractal dimension of gel pores increases with lower water-to-binder ratios. The correlation between fractal dimension and the relative strength growth rate at various cryogenic temperatures differed significantly, where it is negatively correlated with the strength growth rate at -45 ℃. The decrease in fractal dimension indicates the filling effect of ice in the gel pores is more pronounced, causing a decrease in fractal dimension and a reduction in strength. The DSC test shows an obvious crystallization exothermic peak around -45 ℃, which is positively correlated with the water-to-binder ratio. The heat absorption that occurring at -105 ℃ may be associated with a crystalline transition in the pore ice structure, causing a sudden change in the correlation coefficient between the fractal dimension and the strength growth rate. The research results provide a reference for investigating the evolution law of mechanical properties of concrete during the process of cryogenic cooling.
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