C55自密实微膨胀混凝土的设计及在提篮式系杆拱桥施工中的应用
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摘要
根据汉十铁路140 m跨提篮式系杆拱桥钢管混凝土施工要求,通过掺入Ⅰ级粉煤灰、高性能膨胀剂、优化配合比等项试验,探讨了C55自密实微膨胀混凝土的配制及施工工艺。结果表明:配制的混凝土具有良好的工作性能和耐久性能,28 d抗压强度达69.1 MPa、14 d限制膨胀率达到0.028%。相关研究成果为汉十铁路提篮式系杆拱桥自密实混凝土施工质量奠定了扎实的基础。
According to the construction requirements of concrete filled steel tube in basket tied 140 m-span arch bridge of Han–Shi Railway, the preparation and construction process of C55 class self-compacting micro-expansion concrete are discussed by incorporating Class I fly ash, high-performance expansive agent, optimizing mix ratio and so on experiments. The results show that the prepared concrete achieves favorable working performance and durability. The28 d compressive strength is 69.1 MPa and the 14 d restrained expansion rate reaches 0.028%. The relevant research results lay a solid foundation for the self-compacting concrete quality of the basket tied arch bridge of Han–Shi Railway.
According to the construction requirements of concrete filled steel tube in basket tied 140 m-span arch bridge of Han–Shi Railway, the preparation and construction process of C55 class self-compacting micro-expansion concrete are discussed by incorporating Class I fly ash, high-performance expansive agent, optimizing mix ratio and so on experiments. The results show that the prepared concrete achieves favorable working performance and durability. The28 d compressive strength is 69.1 MPa and the 14 d restrained expansion rate reaches 0.028%. The relevant research results lay a solid foundation for the self-compacting concrete quality of the basket tied arch bridge of Han–Shi Railway.
引文
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[2]彭明祥,刘小刚,余成行.C60钢纤维自密实混凝土配合比设计与制备技术[J].施工技术,2008,37(8):82-84.
[3]冯乃谦,叶浩文,马展祥.超高性能自密实混凝土的研发与超高泵送技术[J].施工技术,2018,47(6):117-122.
[4]张海霞,崔鑫,王龙志,等.C50自密实钢管混凝土施工技术研究与应用[J].混凝土,2016(2):153-156.
[5]王建军,廉向东,何建乔.新型高性能自密实无收缩混凝土在钢管混凝土拱桥中的应用[J].公路,2018,63(5):187-191.
[6]马冬梅,吴文清,秦鸿根.自密实高强混凝土的配制原理和配合比设计方法研究[J].中外公路,2008,28(2):177-180.
[7]吴宏斌.钢管拱自密实混凝土泵送顶升施工应用技术研究[J].公路,2018(7):196-198.
[8]刘慧军.大直径钢管混凝土顶升施工关键技术[J].施工技术,2014,43(24):89-93;96.
[9]罗业凤,王建军,陈光辉.合江长江一桥拱肋钢管混凝土灌注施工[J].中外公路,2013,33(3):158-160.
[10]孙滢雪.自密实钢管混凝土在装配式建筑中的应用[J].建材发展导向,2018,16(15):92.
[11]林冬,黄炳生,杨利生.自密实钢管混凝土的研究与应用现状[J].混凝土,2008(12):91-92.