摘要
通过对比试验研究了液体无碱速凝剂与功能性掺合料对喷射混凝土力学性能、耐久性能和工作性的影响,阐明两种材料在喷射混凝土性能提升方面的重要作用,并通过现场试验对所提出的技术措施进行验证.试验结果表明:在力学性能方面,功能性掺合料可以有效提升喷射混凝土早期力学性能,而无碱速凝剂保障了长龄期力学性能持续发展;在耐久性能方面,功能性掺合料的使用可以有效提高喷射混凝土密实性,56 d电通量测试结果低于1000 C;在工作性方面,复合使用无碱速凝剂和功能性掺合料实现了喷射混凝土凝结硬化快、早期强度高,从而有效降低回弹率。
The influence of liquid alkali-free accelerator and functional admixture on the mechanical properties,durability and workability of shotcrete was studied.The important role of the two materials in the performance improvement of shotcrete was clarified.The technical measures proposed were verified by field test.The results show that in terms of mechanical properties,functional admixture can effectively improve the early mechanical properties of shotcrete,while alkali-free accelerator can ensure the long-term development of mechanical properties.In terms of durability,the use of functional admixtures can effectively improve the compactness of shotcrete,and the test results of 56 d electric flux are lower than 1000 C.In terms of workability,the composite use of alkali-free accelerator and functional admixture can achieve fast setting and high early strength of shotcrete,thus effectively reducing the rebound rate.
作者
王家赫
WANG Jiahe(Railway Engineering Research Institution,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;State Key Laboratory for Track Technology of High-speed Railway,Beijing 100081,China)
出处
《混凝土》
CAS
北大核心
2021年第6期73-75,79,共4页
Concrete
基金
国家自然科学基金(51908550)
中国工程院咨询项目(2019-ZD-19-E)
中国铁道科学研究院集团有限公司科研项目(2018YJ044)。
关键词
喷射混凝土
无碱速凝剂
功能性掺合料
力学性能
耐久性
shotcrete
alkali-free accelerator
functional admixture
mechanical property
durability
