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混凝土与制品
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用于桥梁加固的抗扰动超高性能混凝土制备及性能研究

作者：常青山1，2，安昊文1，郎慧东2，周在波1，付鹏2，许玉鹏2

关键字：用于,桥梁,加固,的,抗,扰动,超,高性能,混凝土,

　
（1.山东建筑大学 土木工程学院，山东 济南  250100；
2.山东华迪建筑科技有限公司，山东 济南  251400）
    摘要：针对高架系杆拱桥空心板开裂等问题，以硫铝酸盐水泥（SAC）掺量（等质量取代OPC）、硅灰掺量（等质量取代矿粉）及缓凝剂种类为因素设计正交试验，分析不同因素对超高性能混凝土（UHPC）各龄期强度的影响。由于UHPC的强度较高、水胶比较小，引起流动性不足，实验室合成一种聚羧酸减水剂对其流动度进行调控。结果表明，SAC掺量为25%、硅灰掺量为27%、缓凝剂采用硼酸时，UHPC的力学性能较好，合成的聚羧酸减水剂酸醚比为6时流动性满足相关要求。采用优化配比制备的UHPC其V型漏斗初始流出时间为13.5 s，28 d抗压强度达到设计强度的145%，28 d抗压强度损失率为2.1%，在济南顺河高架桥梁加固中得到成功应用。
    关键词：超高性能混凝土；强度；流动度；微观形貌；工程应用
    中图分类号：TU528.31        文献标识码：A        文章编号：1001-702X（2022）07-0017-05
 
Study on preparation and performance of disturbance resistant ultra high performance concrete for bridge reinforcement
CHANG Qingshan1，2，AN Haowen1，LANG Huidong2，ZHOU Zaibo1，FU Peng2，XU Yupeng2
（1.School of Civil Engineering，Shandong Jianzhu University，Jinan 250100，China；
2.Shangdong Huadi Construction Technology Co. Ltd.，Jinan 251400，China）
    Abstract：In order to solve the cracking problems of hollow slab of viaduct tie arch bridge，orthogonal tests were designed with the content of sulfoaluminate cement（SAC）（equal mass replacing OPC），the content of silica fume（equal mass replacing mineral powder） and the type of retarder as factors to analyze the influence of different factors on the strength of UHPC at different ages. Due to the high strength and small water glue of UHPC，the fluidity is not enough. A polycarboxylic acid water-reducing agent was synthesized in the laboratory to regulate its fluidity. The results show that when SAC content is 25%，silica fume content is 27%，and boric acid is used as retarder，the mechanical properties of UHPC are better，and the fluidity of the synthesized polycarboxylic acid water-reducing agent meets relevant requirements when the acid-ether ratio is 6. The initial outflow time of UHPC V funnel prepared by using the optimized ratio is 13.5 s，the compressive strength of 28 days reaches 145% of the design strength，and the loss rate of 28 days compressive strength is 2.1%，which has been successfully applied in the reinforcement of Shunhe viaduct bridge in Jinan.
    Key words：UHPC，filling material，bleeding，rheological property，strength，regulating mechanism