Research on Effect of Cooling Rate on Concrete Freezing Stress and Its Mechanism
GE Xueliang1,2,3, LU Cairong1,2,3, MEI Guoxing1,2,3
1 Nanjing Hydraulic Research Institute, Nanjing 210029, China; 2 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210029, China; 3 Research Center for Climate Change, MWR, Nanjing 210029, China
Abstract: Frost resistance is one of the important indicators of concrete durability, but freeze-thaw damage of concrete can not been fully explained by any frozen damage theory. Different from the macroscopic antifreeze performance characterization test such as mass loss and dynamic elastic modulus change, a developed device was used to study the freezing stress in a single cooling stage in this paper. The course of freezing stress initial generate, grow, and its final value of the concrete with C30 strength grade and F300 antifreeze grade was compared at -17 ℃, -40 ℃ low temperature, 60 ℃/h, 30 ℃/h, 20 ℃/h, 10 ℃/h and other four cooling rate conditions. The test results showed that the freezing stress of the concrete during the freezing stage can be tested. The cooling rate mainly affects the initial generation time and the increasing speed of the frozen stress. The central temperature of the concrete specimen mainly affects the final frozen stress. Based on the ice crystal growth thermodynamic theory and the mechanics theory porous media, the concrete frozen stress composition and its mechanism model were proposed. This model can explain the effect mechanism of cooling rate and the final low temperature on the frost resistance of concrete.
戈雪良, 陆采荣, 梅国兴. 降温速率对混凝土冻结应力的影响及机理研究[J]. 材料导报, 2020, 34(8): 8051-8057.
GE Xueliang, LU Cairong, MEI Guoxing. Research on Effect of Cooling Rate on Concrete Freezing Stress and Its Mechanism. Materials Reports, 2020, 34(8): 8051-8057.
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2020, Vol. 34 
