The Evolution of Freezing Stress in Concrete Under Freeze-thaw Condition and Its Influence on Frost Resistance
GE Xueliang1,2,3,*, KE Minyong1, LIU Weibao1, LU Cairong1,3, WANG Heng1, MEI Guoxing1, YANG Hu1
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: In order to explore the freezing damage mechanism of concrete in severe cold area and the action mechanism of freezing stress affecting the frost resistance of concrete, based on the simulation of -40 ℃ low-temperature freezing damage condition by large-scale extreme climate simulator, the freezing stress and frost resistance of F300 high frost resistance design concrete under single cooling stage and cooling heating freezing and thawing cycle were studied by using the developed freezing stress test system. At the same time, the microstructure of concrete under freeze-thaw cycle was studied by environmental scanning electron microscope. The experimental results demonstrate that in the single cooling process under -40 ℃ low-temperature, the faster the cooling rate is, the earlier the freezing stress appears, and the greater the increase of freezing stress in the concrete. The freezing stress generated in the cooling stage will accumulate and increase with the continuous cycle of freezing and thawing, and there is a transition inflection point in the development of freezing stress. Under the same low temperature condition in the center of the specimen at the end of cooling, the greater the cooling rate in the cooling stage, the earlier the inflection point from growth to reduction of freezing stress appears. There is a good correlation between the freezing stress in the process of freezing and thawing and the two commonly used evaluation indexes of concrete quality loss and relative dynamic elastic modulus. The freezing stress gradually causes damage to the cement paste, which is manifested in the formation and development of micro cracks, and the damage accumulation produces freezing damage.
戈雪良, 柯敏勇, 刘伟宝, 陆采荣, 王珩, 梅国兴, 杨虎. 混凝土冻融作用下冻结应力演化规律及对抗冻性能的影响[J]. 材料导报, 2024, 38(12): 22070144-5.
GE Xueliang, KE Minyong, LIU Weibao, LU Cairong, WANG Heng, MEI Guoxing, YANG Hu. The Evolution of Freezing Stress in Concrete Under Freeze-thaw Condition and Its Influence on Frost Resistance. Materials Reports, 2024, 38(12): 22070144-5.
1 Ministry of Water Resources of the People's Republic of China, National Bureau of Statistics of the People's Republic of China. First national water census bulletin, China Water & Power Press, China, 2013, pp. 3 (in Chinese). 中华人民共和国水利部, 中华人民共和国国家统计局. 第一次全国水利普查公报, 中国水利水电出版社, 2013, pp.3. 2 Ma K L, Wang Z Z, Long G C, et al. Materials Reports, 2021, 35(19), 19091 (in Chinese). 马昆林, 王中志, 龙广成, 等. 材料导报, 2021, 35(19), 19091. 3 Xie R F, Lu L J, Qiao P Z. Scientia Sinaca Technologica, 2018, 48(10), 1092 (in Chinese). 谢瑞峰, 陆林军, 乔丕忠. 中国科学:技术科学, 2018, 48(10), 1092. 4 Li S G, Chen G X, Lu Y H. Journal of Hydraulic Engineering, 2013, 44(S1), 80 (in Chinese). 李曙光, 陈改新, 鲁一晖. 水利学报, 2013, 44(S1), 80. 5 Mayercsik N P, Vandanune M, Kurds K E. Cement and Concrete Research, 2016, 88, 43. 6 Su H Z, Xie W. Bulletin of the Chinese Ceramic Society, 2021, 40(4), 1053 (in Chinese). 苏怀智, 谢威. 硅酸盐通报, 2021, 40(4), 1053. 7 戈雪良, 陆采荣, 梅国兴, 等. 中国专利, CN107290090A, 2017. 8 Ge X L, Lu C R, Mei G X. Materials Reports, 2020, 34(4), 8051 (in Chinese). 戈雪良, 陆采荣, 梅国兴. 材料导报, 2020, 34(4), 8051. 9 Kaufmann J P. Cement and Concrete Research, 2004, 34(8), 1421. 10 陆采荣, 张建云, 戈雪良, 等. 中国专利, ZL201210256518. 2, 2013. 11 Li W T, Sun W, Jiang J Y. Construction and Building Materials, 2011, 25(5), 2604. 12 Penttala V. Cement and Concrete Research, 2002, 32(9), 1407. 13 Bjorn Johannesson. Cement and Concrete Research, 2010, 32, 73. 14 戈雪良, 陆采荣, 梅国兴, 等. 中国专利, ZL201721045566.1, 2018.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2024, Vol. 38 
