中文摘要：

研究混凝土纤维掺量、掺合料种类和所受压应力大小等三种因素对混凝土抗氯离子渗透性能的作用,对于氯离子侵蚀环境中的混凝土结构耐久性设计有非常重要的意义。本文通过设计正交试验,将56d龄期混凝土试块置于能够给混凝土施加持续压力作用的特制混凝土氯离子渗透性能测试装置下进行氯离子电通量试验。试验结果表明：聚丙烯纤维的掺入可以提高混凝土抗氯离子渗透性能,且最佳纤维掺量为0.1%;掺合料对混凝土抗氯离子渗透性作用效应由强到弱依次为：锂渣〉锂渣粉煤灰复掺〉粉煤灰〉普通混凝土〉硅灰,锂渣的掺入能够明显改善混凝土抗氯离子渗透性能;施加压应力初期混凝土抗氯离子渗透性能得以增强,但压应力过大反而降低了混凝土抗氯离子渗透性能,有益于混凝土抗氯离子渗透性的压应力大小不能超过混凝土极限强度的50%。通过对正交试验结果进行极差分析发现：掺合料种类为影响混凝土渗透性的最大因素,纤维掺量与压应力大小对混凝土渗透性的作用效应相当。

英文摘要：

For durability design of concrete structure subjected to erosion of chlorine ion Cl^-, it＇s of great significance to investigate the effect of three factors, including the concrete fiber content, the type of admixture and the stress magnitude, on the concrete resistance to chlorine ion permeability of. In this paper, through orthogonal experiment, chlorine ion Cl^- electric flux experiment of 56 day age concrete test block was carried out by using a special concrete chlorine ion permeability performance testing device, which can exert durable pressure on test block. Experimental results indicate that the performance of anti-chlorine ion permeability of concrete can be improved by admixture of polypropylene fiber, and the optimal addition volume of fibers is 0.1%. The effect of admixtures on concrete anti-chlorine ion permeability is as follow （from strongest to weakest）： lithium slag, lithium slag and fly ash mixture, fly ash, ordinary concrete, silica fume. The addition of lithium slag can significantly improve the resistance of concrete to chlorine ion penetration. Anti-chlorine ion permeability of concrete can be enhanced after applying pressure stress, but overstress will decrease the performance of concrete resistance to chlorine ion permeability. The magnitude of compression stress, which is helpful to anti chlorine ion permeability in concrete should be lower than 50% of the ultimate strength of concrete. Through range analysis of orthogonal experimental results, it is found that the admixture type is the biggest factor that affects the permeability of concrete, the effect of fiber content and compressive stress on concrete permeability is quite similar.