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为了研究疲劳载荷耦合作用下氯离子在矿渣砂浆中的传输行为,通过自行设计的实验方法实现了疲劳荷载和氯离子扩散过程的同步耦合.实验中对试件施加的应力水平S分别为0.3,0.4和0.5;矿渣的掺量分别为胶凝材料的0%,10%,30%和50%;在加载过程中,采用声发射技术对试件的疲劳损伤进行三维定位的同步监测,进一步对疲劳荷载下氯离子扩散规律从三维动态的角度进行佐证.结果表明,疲劳荷载确实加速了氯离子在水泥基材料中的传输,且随着载荷的提高,其扩散程度进一步加剧;而矿渣的掺入能有效改善水泥基材料抗氯离子的侵蚀性能,其最佳掺量为胶凝材料的30%,但随着矿渣含量的提高,其对氯离子扩散的抑制效果有所减弱;与交替实验对比表明,加载过程的动态效应对氯离子在矿渣砂浆中的传输有显著影响.
In order to study the transport behavior of chloride ions in slag mortar under the action of fatigue load, the synchronous coupling of fatigue load and chloride ion diffusion process was achieved by a self-designed experimental method.The stress levels S applied to the specimens were 0.3, 0.4 and 0.5 respectively. The content of slag was 0%, 10%, 30% and 50% of the cementitious material respectively. During the loading process, the acoustic emission technique was used to synchronously monitor the fatigue damage of specimens. The results show that the fatigue load accelerates the transport of chloride ions in cement-based materials, and further increases with the increase of load. However, the slag doping The best dosage of cementitious materials is 30% of the cementitious material, but the inhibitory effect on chloride diffusion is weakened with the increase of slag content. Compared with the alternating experiment The comparison shows that the dynamic effect of loading process has a significant impact on the chloride ion transport in slag mortar.