RATIONAL DURABILITY DESIGN AND MAINTENANCE FOR FROST ATTACK AND COMBINED EFFECTS
This paper introduces an attempt by the research group to upgrade the currentdurability design and maintenance of concrete structures against freeze-thaw cycles (FTC)and its combined effects with chloride ion ingress,mechanical loading and wet-dry cycles. Themain features are (1) development of numerical model for prediction of frost damage (FD),(2) development of on-site measurement for FD index,(3) development of simulation schemefor property of concrete with damage due to FTC and its combined effects,(4) performanceevaluation of member with damage due to FTC and its combined effects,and (5) developmentof repairing method for member with damage due to FTC and its combined effects. The latestresearch results by the group are briefly presented. The newly proposed numerical model inmeso scale can simulate cyclic strain development under FTC. In this model coupled heat andmoisture transfer is analyzed with three phase of water,and the transfer analysis is coupledfurther with mechanical stress-strain analysis. Using non-destructive testing equipment withultrasonic wave,the new method to measure FD index on site is presented. The relationshipbetween this index and various concrete properties which are necessary to evaluate concretemember performance is observed.
durability design frost attack frost damage model model for frost-damaged concrete on-site damage evaluation performance evaluation
Ueda Tamon
Division of Built Environment,Hokkaido University,Japan
国际会议
The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)
杭州
英文
165-171
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）