超缓凝大体积混凝土配合比优化及温控技术

发布时间：2018-02-27 14:09

本文关键词： 大体积混凝土配合比绝热温升缓凝剂温控措施　出处：《硅酸盐通报》2017年06期 　论文类型：期刊论文

【摘要】：结合嘉鱼长江公路大桥10#主墩承台大体积混凝土的温控防裂施工,研究了缓凝剂种类、粉煤灰与矿渣粉复合矿物掺合料掺量和聚丙烯腈纤维对混凝土凝结时间、工作性、力学性能、绝热温升和耐久性的影响,优化配制了一种具有超缓凝和低水化热温升的C40承台混凝土;采用Midas FEA有限元仿真计算软件分析了承台大体积混凝土的温度场和应力场,通过降低混凝土浇筑温度、合理设置冷却水管和保温保湿养护等一系列温控措施,确保了承台大体积混凝土施工各项温度指标均符合温控标准要求,拆模后未出现有害温度裂缝。
[Abstract]:Combined with the temperature control and crack prevention construction of the mass concrete of the main pier of Jiayu Changjiang River Highway Bridge 10#, the types of retarder, the amount of mineral admixture of fly ash and slag powder and the setting time and workability of polyacrylonitrile fiber to concrete are studied. Under the influence of mechanical properties, adiabatic temperature rise and durability, a kind of C40 cap concrete with super retarding and low hydration heat temperature rise was optimized, and the temperature field and stress field of the cap mass concrete were analyzed by Midas FEA finite element simulation software. Through a series of temperature control measures such as reducing the pouring temperature of concrete, setting up the cooling water pipe reasonably and maintaining the heat and moisture, all the temperature indexes of the mass concrete construction of the cap can meet the requirements of the temperature control standard. No harmful temperature cracks appeared after mold removal.
【作者单位】：武汉理工大学硅酸盐建筑材料国家重点实验室;湖北交投智能检测股份有限公司;
【分类号】：TU528

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