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先张法新型U梁混凝土配制技术研究
作者：陈克伟1，2，张坤3，谷坤鹏1
（1.中交上海三航科学研究有限公司，上海 200032；2.同济大学 材料科学与工程学院，上海 201804；
3.中交三航局第三工程有限公司，江苏 南京 210011）
3.中交三航局第三工程有限公司，江苏 南京 210011）
摘要：青岛地铁R3线工程高架采用先张法新型U梁体结构，设计强度为C55，U梁混凝土要求高早期强度、弹性模量、耐久性，低早期抗裂性及良好外观质量。采用低水胶比、合理的掺合料组合、掺加聚丙烯纤维的方法配制符合要求的U梁混凝土，通过研究骨料级配、砂率、水胶比、胶凝材料组成、聚丙烯纤维、外加剂组份对混凝土工作性能、强度、弹性模量、耐久性、早期开裂性及外观质量的影响规律，优选出符合地铁新型U梁性能指标要求的混凝土配合比，保障了工程质量。
关键词：U梁；混凝土；早期强度；早期弹性模量；聚丙烯纤维；外观质量
中图分类号：TU757.1+3 文献标识码：A 文章编号：1001-702X（2019）09-0066-04
Research on concrete preparation technology for the pretensioned new U-beam
CHEN Kewei1，2，ZHANG Kun3，GU Kunpeng1
（1.CCCC Shanghai Third Harbour Engineering Academy of Science Co. Ltd.，Shanghai 200032，China；
2.School of Materials Science and Engineering of Tongji University，Shanghai 201804，China；
3.CCCC Shanghai Third Harbour Engineering Third Engineering Co. Ltd.，Nanjing 210011，China）
Abstract：The concrete strength grade of new U-beam structure with elevated pre-tensioning method for R3 line of Qingdao Metro is C55，the concrete for which shall have high early strength，modulus of elasticity，durability，low early crack resistance and good appearance quality. The U-beam concrete was prepared by low water-binder ratio，reasonable mixtures and polypropylene fibers. This paper optimizes the mix proportion that meets the requirements of various performance indexes of new U-beam concrete by studying the influence of aggregate gradation，sand ratio，water-binder ratio，cementitious material composition，polypropylene fiber and admixture. Through the above research，the project quality of Qingdao Metro R3 line is guaranteed.
Key words：U-beam，concrete，early strength，early modulus of elasticity，polypropylene fiber，appearance quality