The Research Of The Effect Of Two-way Load、Freezing-Thawing Cycles And Curing Age On Chloride Permeability Of Concrete

This paper conducts an experimental research chloride permeability of high performance concrete under two-way load with different curing ages and freeze-thaw cycles. Under all of load periods (28d、56d、84d) and freeze-thaw cycles, the electric flux of high-performance concrete, with two types of mineral admixture at water binder ratio0.32, is measured by ASTM C1202. The function relations between chloride ion dielectric flux and different factors were established.The test results show that:(1) Two-way load, freeze-thaw cycle number, standard curing ages and load period have significantly influence on chloride permeability in concrete;(2) The functional relationships between chloride ion dielectric flux and two-way load grade, freeze-thaw cycle number, standard curing age and load period is nearly suitable to quadratic polynomial, linear, power function and log function relation respectively;(3) Under the vertical pressure load and no freeze-thaw cycle effect, when the lateral pressure load is lower than15%of the ultimate load, the anti-chloride-permeability performance of concrete enhances with the increase of the lateral pressure load; when the load level is higher than15%of the ultimate load, the anti-chloride-permeability performance of concrete gradually decreases with the increase of the lateral pressure load.