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降黏型复合矿物掺合料对C60超高泵送混凝土性能的影响

作者：高超1，2，曹永3，汤国芳3，李鹏3，刘贵双3，卢传泰3，杨捍捍4，姚抗4

关键字：降黏型,复合,矿物,掺合,料,对,C60,超高,泵送,

　
（1.国家建筑工程技术研究中心，北京  100013；2.中国建筑科学研究院有限公司，北京  100013；
3.江苏诚意工程技术研究院有限公司，江苏 徐州  221000；4.徐州市天晟混凝土有限公司，江苏 徐州  221000）
    摘要：C60超高泵送混凝土对拌合物性能、力学性能和耐久性能的技术要求较高。为配制出满足C60超高泵送技术要求的混凝土，试验研究了降黏型复合矿物掺合料对C60超高泵送混凝土的工作性、抗压强度及耐久性的影响。结果表明：当降黏型复合矿物掺合料取代水泥占胶凝材料总质量的6%~9%时，混凝土的泵送性能显著提升，早期抗压强度略有降低，后期抗压强度有所提高，抗碳化性能、抗渗性能及抗氯离子渗透性能均有所提高。
    关键词：降黏型复合矿物掺合料；超高泵送混凝土；工作性能；力学性能；耐久性能
    中图分类号：TU528.53        文献标识码：A        文章编号：1001-702X（2022）09-0023-04
 
Effect of viscosity-reducing composite mineral admixtures on the performance of C60 ultra-high pumping concrete
GAO Chao1，2，CAO Yong3，TANG Guofang3，LI Peng3，LIU Guishuang3，LU Chuantai3，YANG Hanhan4，YAO Kang4
（1.National Construction Engineering Technology Research Center，Beijing 100013，China；2.China Academy of Building Research，Beijing 100013，China；3.Jiangsu Chengyi Engineering Technology Research Institute Co. Ltd.，Xuzhou 221000，China；
4.Xuzhou Tiansheng Concrete Co. Ltd.，Xuzhou 221000，China）
    Abstract：C60 ultra-high pumping concrete has higher technical requirements for concrete mixture，mechanics and durability.In order to prepare concrete meeting the technical requirements of C60 ultra-high pumping，the effects of viscosity-reducing composite mineral admixtures on the workability，compressive strength and durability of C60 ultra-high pumping concrete were experimentally studied.The results show that when the viscosity-reducing composite mineral admixture replaces cement by 6%~9% of the cementitious material，the pumping performance of concrete is significantly improved，the early compressive strength is slightly reduced，and the late compressive strength is improved. The carbonation resistance，permeability resistance and chloride ion permeability resistance are improved.
    Key words：viscosity-reducing composite mineral admixtures，ultra-high pumping concrete，working performance，mechanical property，durability