约束状态下混凝土抗氯离子渗透性试验研究

发布时间：2018-02-05 19:12

本文关键词： 混凝土氯离子渗透性约束状态　出处：《混凝土》2017年05期 　论文类型：期刊论文

【摘要】：氯离子渗透性是评价高性能混凝土耐久性的重要指标,混凝土在长期服役过程中会受到很多外在的约束,约束状态会影响混凝土的内部结构。应用板式混凝土早期收缩开裂试验架制成约束状态下C50高性能混凝土,采用ASTM C1202直流电通量法,研究C50高性能混凝土在约束和自由状态下抗氯离子渗透性能。结果表明:与自由状态相比,约束状态降低了混凝土抗氯离子渗透性;在约束状态下,同一配合比混凝土,不同位置的抗氯离子渗透性有所差异;粉煤灰及聚丙烯纤维的加入降低了混凝土抗氯离子渗透性,而掺入硅灰会增强混凝土的抗氯离子渗透性。
[Abstract]:Chloride ion permeability is an important index to evaluate the durability of high performance concrete. The concrete will be subjected to a lot of external constraints in the long service process. The confined state will affect the internal structure of concrete. Using the early shrinkage cracking test frame of slab concrete to make C50 high performance concrete under restraint state, the direct current flux method of ASTM C1202 is adopted. The chloride permeation resistance of C50 high performance concrete in confined and free state is studied. The results show that: compared with free state, confined state reduces chloride ion permeability of concrete; In the confined state, the resistance to chloride ion permeability of concrete with the same mix ratio is different in different positions. The addition of fly ash and polypropylene fiber can reduce the resistance to chloride ion permeability of concrete, but the addition of silica fume can enhance the chloride ion resistance of concrete.
【作者单位】：沈阳建筑大学材料科学与工程学院;
【基金】：基金项目：中国建筑材料联合会(2015-M3-1) 中华人民共和国住房和城乡建设部(2015-K4-002)
【分类号】：TU528

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