<正>The stress device were assessed and improved according to previous research,and which realizes the stress condition in concrete by means of disc spring,and by using of stress sensor the stress can be controlled according to the research demand The on line monitoring and analyze of permeability of chloride ion was realized combined the stress device with NEL and ASTM C1202 method. The transport performance of chloride ion in concrete was researched combined under the different stress ratio from 0.1 to 0.7,and the mechanism was studied with the different threshold value of different stress and ultrasonic and MIP method.
permeability;;chloride ion;;concrete;;stress condition
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