Water Absorption and Chloride Ion Penetrability of Concrete Damaged by Freeze-thawing and Loading  

作　　者：杨林 SUN Wei LIU Cheng 张云升 LIANG Fei 

机构地区：[1]Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing 211189, China [2]School of Materials Science & Engineering, Southeast University, Nanjing 211189, China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2017年第2期330-337,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Major State Basic Research Development Program of China(973 Program)(No.2015CB655102);the National Natural Science Foundation of China(Nos.51178106,51378116&51408597);the Scientific and Technological Research and Development plan of China Railway Corporation(No.2013G001-A-2)

摘　　要：In order to investigate water and chloride ion transport in damaged concrete, three types of concrete were prepared, freeze-thawing（F-T） cycling and compressive loading were adopted to induce damage to concrete. Ultrasonic pulse velocity technique was used for evaluating the damage degree of concrete, and the defects of damaged concrete were also detected by X-CT. Water absorption and chloride ion penetrability were used for describing the transport properties of damaged concrete. Effects of damage degree on the water absorption rate and chloride ion penetrability were investigated in detail and the relationships were also established. The results show that the water absorption of concrete makes various responses to damage degree due to the difference of concrete type and damage method. For same concrete with similar damage degree, the water absorption rate of F-T damaged concrete is usually larger than that of concrete damaged by loading. The chloride ion penetrability of damaged concrete increases linearly with increasing damage degree, which is more sensitive to damage degree if the original penetrability of sound concrete is higher.In order to investigate water and chloride ion transport in damaged concrete, three types of concrete were prepared, freeze-thawing（F-T） cycling and compressive loading were adopted to induce damage to concrete. Ultrasonic pulse velocity technique was used for evaluating the damage degree of concrete, and the defects of damaged concrete were also detected by X-CT. Water absorption and chloride ion penetrability were used for describing the transport properties of damaged concrete. Effects of damage degree on the water absorption rate and chloride ion penetrability were investigated in detail and the relationships were also established. The results show that the water absorption of concrete makes various responses to damage degree due to the difference of concrete type and damage method. For same concrete with similar damage degree, the water absorption rate of F-T damaged concrete is usually larger than that of concrete damaged by loading. The chloride ion penetrability of damaged concrete increases linearly with increasing damage degree, which is more sensitive to damage degree if the original penetrability of sound concrete is higher.

关 键 词：concrete water absorption chloride ion freeze-thawing loading durability 

分 类 号：TU528[建筑科学—建筑技术科学]