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《Journal of Yangtze River Scientific Research Institute》 2010-03
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Influences of Erosion Modes on Sulfate-ion Transportation in Concrete

LI Feng-lan1,MA Li-heng1,GAO Run-dong2,ZHAO Shun-bo1(1.School of Civil Engineering and Communication,North China Institute of Water Conservancy andHydroelectric Power,Zhengzhou 450011,China;2.State key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China)  
The erosion modes of both continuous immersion and wetting-drying cycles were selected to study their effects on the transportation process of sulfate-ion in concrete.The strength grade of concrete was C40,the natural dry mode in room temperature was used.The concentration of sodium sulfate solutions were 800 mg/L,6000 mg/L and 50 000 mg/L respectively.With the erosion ages of 30 d,90 d,180 d,360 d and 580 d,the samples were made by drilling core,cutting into slices and grinding into powder,and tested by the chemical analysis method.In comparison with continuous immersion,the wetting-drying cycles can generally accelerate the sulfate-ion transportation into concrete in deep,and increase the sulfate-ion content in the same depth of concrete.The sulfate-ions in erosion solution of lower concentration tend to be transported into deep place of concrete where the sulfate-ion content will be increased.The erosion solution of high concentration tends to generate concrete failure from the exterior to the interior,so much more sulfate-ions are gathered in the shallow layer of concrete.
【Fund】: 河南省杰出青年科学基金(04120002300);; 国家自然科学基金委和雅砻江联合基金(50579096)
【CateGory Index】: TU528
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