Focusing on the huge differences between field and laboratory freeze-thaw environments, a quantitive method to measure the effect of field freeze-thaw environments on concrete durability was provided as well as the relationship between on-site test in natural environments and indoor experiment. After considering available data of natural annual average freeze-thaw cycles, a statistical method was proposed to get the on-site freeze-thaw cycles by using the average annual number of negative-temperature days as an index. A practical formula was obtained to predict the natural freeze-thaw cycles accordingly. Then the proportion of concrete damage between different freeze-thaw environments was obtained based on the hydrostatic pressure theory according to the average freezing rate in the freezing and thawing. A method for predicting the equivalent laboratory freeze-thaw cycles from on-site freeze-thaw cycles was given. Furthermore, the durable life of concrete in natural frost environments can be easily predicted by the equivalent laboratory cycle number. Finally, the environmental zonation under freeze-thaw condition in China was established by taking the equivalent laboratory freeze-thaw cycles as a quantitive index, and a durability design method was presented accordingly by using the zonation map.
WU Hai-rong, JIN Wei-liang, YAN Yong-dong, XIA Jin. Environmental zonation and life prediction of concrete in
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