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西安市地下管廊混凝土耐久性能研究
作者：姚源，罗作球，秦志勇，张凯峰，刘江非，欧阳平，王佳敏，王敏
（中建西部建设北方有限公司，陕西 西安 701116）
摘要：针对地下管廊混凝土的特点，研究了膨胀剂、水泥基渗透结晶型防水材料、尾矿以及微珠对混凝土耐久性的影响。结果表明，微珠能大幅降低混凝土的干缩和抗裂试验中的裂缝面积；氯离子渗透性都属于极低范围，其中掺入水泥基渗透结晶型防水材料以及微珠的试件抗氯离子渗透性能最佳；抗水渗透试验结果与抗氯离子试验结果相似；不同的影响因素都能在一定程度上降低耐蚀系数，提升混凝土抗硫酸盐侵蚀的能力。
关键词：地下管廊；耐久性；抗渗；收缩
中图分类号：TU528.7 文献标识码：A 文章编号：1001-702X（2020）09-0147-04
Study on durability of concrete for underground pipe gallery in Xi'an city
YAO Yuan，LUO Zuoqiu，QIN Zhiyong，ZHANG Kaifeng，LIU Jiangfei，OUYANG Ping，WANG Jiamin，WANG Min
（China Construction West Construction North Co. Ltd.，Xi'an 701116，China）
Abstract：In view of the characteristics of concrete in underground pipe gallery，the effects of expansion agent，cement-based permeable crystalline material，tailings and microbeads on the durability of pipe-hanger concrete were studied. Tests have shown that the microspheres can significantly reduce the crack area in the concrete shrinkage and crack resistance test. The chloride ion permeability of this test is extremely low，and the test pieces doped with ruthenium and microbeads have the best resistance to chloride ion permeation. The test results of water penetration resistance are similar to those of the chloride ion resistance test. Different influencing factors can reduce the corrosion resistance to a certain extent and improve the ability of concrete to resist sulfate attack.
Key words：underground pipe gallery，durability，impermeability，shrinkage