双向压荷载对高性能混凝土氯离子渗透性的影响

Influence of Two-Way Load on Chloride Permeability of High Performance Concrete

采用ASTM C1202快速试验方法——直流电通量法,研究了双向荷载及龄期对C30高性能混凝土抗氯离子渗透性能的影响.试验结果表明:双向荷载对混凝土的损伤以及养护龄期对混凝土损伤的修复均对氯离子渗透性产生显著影响.在竖向压荷载存在的条件下,当侧向压荷载低于30%极限荷载时,随着侧向压荷载的增加,混凝土抗氯离子渗透性能有所增强;当侧向压荷载高于30%极限荷载时,随着侧向压荷载的增加,混凝土抗氯离子渗透性能逐渐减弱.无论施加双向荷载还是施加单向荷载,当荷载水平高于30%极限荷载时,混凝土抗氯离子渗透性能均随时间的增长逐渐降低.

Anti-chloride penetrative properties of C30 high performance concrete subjected to two-way load at different standard curing ages were studied by ASTM C1202. The test results show that deterioration due to two-way load and reparation with curing ages have significant influence on chloride permeability. Under the vertical pressure load, when the lateral pressure load is lower than 30 % of the ultimate load, the anti-chloride penetrative property of concrete enhances with the increase of the lateral pressure load; when the lateral pressure load exceeds 30%, the anti-chloride penetrative property of concrete declines with the increase of the lateral pressure load. When the load level is higher than 30%0//oo of the ultimate load, the anti chloride penetrative property of concrete decreases with the increase of time, no matter in two-way load or one-way load.