低回弹高早强喷射混凝土技术与工程应用_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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低回弹高早强喷射混凝土技术与工程应用

Technology and Engineering Application of Shotcrete with Low Rebound and High Early Strength

2023年第2期

喷射混凝土；低回弹；高早强；力学性能；耐久性能

Shotcrete; Low rebound ratio; High early strength; Mechanical property; Durability

2023年第2期

10.19761/j.1000-4637.2023.02.005.05

国家自然科学基金项目（51908550）；中国铁道科学研究院集团有限公司科研项目（2021YJ173）。

王家赫1,2，谢永江1,2，冯仲伟1,2，谭盐宾1,2，李化建1,2，李享涛1,2，仲新华1,2

1.中国铁道科学研究院集团有限公司铁道建筑研究所，北京 100081；2.高速铁路轨道技术国家重点实验室，北京 100081

王家赫1,2，谢永江1,2，冯仲伟1,2，谭盐宾1,2，李化建1,2，李享涛1,2，仲新华1,2

王家赫,谢永江,冯仲伟,等.低回弹高早强喷射混凝土技术与工程应用[J].混凝土与水泥制品,2023(2):5-9.

WANG J H,XIE Y J,FENG Z W,et al.Technology and Engineering Application of Shotcrete with Low Rebound and High Early Strength[J].China Concrete and Cement Products,2023(2):5-9.

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摘要：为降低喷射混凝土施工回弹率、提高其早期力学性能和长期耐久性能，结合铁路隧道复合式衬砌结构体系对喷射混凝土的性能要求，研发了喷射混凝土用功能材料，并提出低回弹高早强喷射混凝土制备技术。通过试验室试验和工程应用案例，验证了该功能材料配制技术的可行性和使用效果。试验室试验结果表明：喷射混凝土的施工回弹率与其流变参数密切相关，所研发的功能材料与速凝剂复掺可显著提高喷射混凝土的早期力学性能和耐久性能，并降低施工回弹率。工程应用结果表明：采用本文提出的技术后，所制备的隧道初支喷射混凝土的施工回弹率≤10%，喷射混凝土8 h抗压强度≥10 MPa，24 h抗压强度≥15 MPa，56 d电通量＜1 200 C，满足隧道高性能混凝土的施工要求。 Abstract: In order to reduce the rebound rate of shotcrete construction, improve the early mechanical properties and long-term durability, combined with the performance requirements of the composite lining structure system of railway tunnels for shotcrete, functional materials for shotcrete were developed, and the preparation technology of low rebound and high early strength shotcrete was proposed. The feasibility and application effect of the preparation technology of functional materials were verified through laboratory and engineering applications. The laboratory test results show that the rebound rate of shotcrete construction is closely related to its rheological parameters. The developed functional materials and accelerator can significantly improve the early mechanical properties and long-term durability of shotcrete, and reduce the construction rebound rate. The engineering application results show that after adopting the technologies proposed, the construction rebound rate of shotcrete for initial tunnel support is≤10%, the compressive strength of shotcrete for 8 h is≥10 MPa, the compressive strength for 24 h is≥15 MPa, and the 56 d electric flux is ＜1 200 C, which can meet the construction requirements of tunnel high-performance concrete.

英文名 : Technology and Engineering Application of Shotcrete with Low Rebound and High Early Strength

刊期 : 2023年第2期

关键词 : 喷射混凝土；低回弹；高早强；力学性能；耐久性能

Key words : Shotcrete; Low rebound ratio; High early strength; Mechanical property; Durability

刊期 : 2023年第2期

DOI : 10.19761/j.1000-4637.2023.02.005.05

文章编号 :

基金项目 : 国家自然科学基金项目（51908550）；中国铁道科学研究院集团有限公司科研项目（2021YJ173）。

作者 : 王家赫1,2，谢永江1,2，冯仲伟1,2，谭盐宾1,2，李化建1,2，李享涛1,2，仲新华1,2

单位 : 1.中国铁道科学研究院集团有限公司铁道建筑研究所，北京 100081；2.高速铁路轨道技术国家重点实验室，北京 100081

王家赫1,2，谢永江1,2，冯仲伟1,2，谭盐宾1,2，李化建1,2，李享涛1,2，仲新华1,2

王家赫,谢永江,冯仲伟,等.低回弹高早强喷射混凝土技术与工程应用[J].混凝土与水泥制品,2023(2):5-9.

WANG J H,XIE Y J,FENG Z W,et al.Technology and Engineering Application of Shotcrete with Low Rebound and High Early Strength[J].China Concrete and Cement Products,2023(2):5-9.

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摘要

参数

结论

参考文献

引用本文

Abstract: In order to reduce the rebound rate of shotcrete construction, improve the early mechanical properties and long-term durability, combined with the performance requirements of the composite lining structure system of railway tunnels for shotcrete, functional materials for shotcrete were developed, and the preparation technology of low rebound and high early strength shotcrete was proposed. The feasibility and application effect of the preparation technology of functional materials were verified through laboratory and engineering applications. The laboratory test results show that the rebound rate of shotcrete construction is closely related to its rheological parameters. The developed functional materials and accelerator can significantly improve the early mechanical properties and long-term durability of shotcrete, and reduce the construction rebound rate. The engineering application results show that after adopting the technologies proposed, the construction rebound rate of shotcrete for initial tunnel support is≤10%, the compressive strength of shotcrete for 8 h is≥10 MPa, the compressive strength for 24 h is≥15 MPa, and the 56 d electric flux is ＜1 200 C, which can meet the construction requirements of tunnel high-performance concrete.

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