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Analysis of Damage Degradation Parameters of Concrete Subjected to Freezing-thawing Cycles and Chemical Attack(PDF)


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Analysis of Damage Degradation Parameters of Concrete Subjected to Freezing-thawing Cycles and Chemical Attack
YU Hong-fa1 SUN Wei2 MA Hai-yan1 ZHANG Yun-sheng2 WANG Jia-chun13 CHEN Shu-dong14
1. Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China; 2. School of Materials Science and Engineering, Southeast University, Nanjing 210096, Jiangsu, China; 3. Department of Civil Engineer
concrete single factor double factor initial damage velocity second initial damage velocity damage acceleration freezing-thawing life
Initial damage velocity(IDV)and damage acceleration(DA)of concrete subjected to single or combined factors, such as freezing-thawing and chemical attacks, were obtained through a mass of durability experiments, and the database was also established. Regression and correlative analysis of the database were carried out by using SPSS10.0 software. Results show that IDV and DA of concrete are determined by the environment, climate and load state and at the same time are closely influenced by the raw materials, mixture ratio and curing condition. Lower water cement ratio and higher relative humidity can reduce IDA and DA of concrete subjected to either signal or double factors. For concrete subjected to single factor, IDV and DA can be decreased by adding steel fibers, while for concrete subjected to double factors, IDV and DA can be decreased by adding higher elasticity module polyethylene fibers or mineral admixture. It is evident that the larger the IDV and DA are, the shorter the freezing-thawing life is.


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Last Update: 2011-12-20