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低温环境下UHPC的性能研究及工程应用
作者：黄有强1，2，3，陈露一1，2，3，李信2，张志豪2，郑丽2
（1.桥梁结构健康与安全国家重点实验室，湖北 武汉 430034；
2.中铁桥研科技有限公司，湖北 武汉 430034；3.中铁大桥科学研究院有限公司，湖北 武汉 430034）
2.中铁桥研科技有限公司，湖北 武汉 430034；3.中铁大桥科学研究院有限公司，湖北 武汉 430034）
摘要：研究了超高性能混凝土（UHPC）在凝结硬化和强度发展的关键时期，在低温环境下的性能发展规律；介绍了UHPC实际工程应用中的低温防护措施及应用效果。结果表明：经短时间（7 d内）标养后再进行低温养护，UHPC各龄期强度发展均受到一定的影响，且温度越低影响越大；经短时间（7 d内）低温养护后再进行标养，UHPC强度仍能持续发展，甚至能逐步赶上标养试件的强度；UHPC经1000次冻融循环后，相对动弹性模量仍大于100%，质量无损失，强度耐蚀系数大于85%。工程应用表明：通过对原材料储存与拌合、运输与浇筑、早期养护等多方面采取加热或保温措施，可保证UHPC在低温环境中的施工质量。
关键词：超高性能混凝土；低温养护；工程应用；冬季施工措施
中图分类号：TU528.31 文献标识码：A 文章编号：1001-702X（2022）06-0097-06
Performance research and engineering application of UHPC in low temperature environment
HUANG Youqiang1，2，3，CHEN Luyi1，2，3，LI Xin2，ZHANG Zhihao2，ZHENG Li2
（1.State Key Laboratory for Health and Safety of Bridge Structures，Wuhan 430034，China；2.China Railway Britech Co. Ltd.，Wuhan 430034，China；3.China Railway Bridge Science Research Institute Co. Ltd.，Wuhan 430034，China）
Abstract：In this paper，the law of performance development of Ultra-High Performance Concrete（UHPC） in low temperature environment is studied in the critical period of setting hardening and strength development. The low temperature protection measures and application effect of UHPC in practical engineering application are introduced. The results showed that under the action of low temperature curing after a short period（within 7 days） of standard curing，the strength development of each age of UHPC is affected to a certain extent，and the lower the temperature is，the greater the influence is. Under the action of standard curing after a short period（within 7 days） of low-temperature curing，UHPC strength can still continue to develop，and even gradually catch up with the strength of standard specimens. After 1000 freeze-thaw cycles，the relative dynamic elastic modulus of UHPC is still greater than 100%，with no mass loss and strength corrosion resistance coefficient greater than 85%. The engineering application of UHPC shows that the construction quality of UHPC in low temperature environment can be guaranteed by adopting heating or heat preservation measures in storage and mixing of raw materials，transportation and pouring of UHPC and early maintenance of UHPC.
Key words：UHPC，low temperature curing，engineering application，construction measures in winter