隧道混凝土抗渗抗裂能力提升改进技术  

Improvement Technology for Enhancing the Anti-seepage and Crack Resistance of Tunnel Concrete

作　　者：张峰 黄裕群 范勇 ZHANG Feng;HUANG Yuqun;FAN Yong(Hubei Communications Planning and Design Institute Co.,Ltd.,Wuhan,Hubei 430000,China)

机构地区：[1]湖北省交通规划设计院股份有限公司,湖北武汉430000

出　　处：《黑龙江交通科技》2025年第3期89-93,共5页Communications Science and Technology Heilongjiang

摘　　要：针对隧道混凝土在抗渗和抗裂性能上的不足,提出了改进措施。通过控制机制砂中石粉含量和使用硅烷浸渍技术增强隧道混凝土的耐久性。研究发现,当机制砂中石粉含量为8%时,混凝土的抗渗和抗裂能力达到最佳,这归因于石粉的微粒填充效应,改善了水泥石与骨料界面的过渡区,提高了混凝土的整体性和密实度。此外,硅烷浸渍技术的应用显著提升了混凝土表面的密实度,有效隔绝外界水分的侵入,增强了混凝土的抗渗性能。通过扫描电镜观察和维氏硬度测试进一步证实了硅烷浸渍后混凝土表面更为致密且硬度提高。研究结果表明,合理控制机制砂中石粉含量并结合硅烷浸渍技术,可提升隧道混凝土的耐久性,延长隧道的使用寿命,降低维护成本。Propose improvement measures to address the shortcomings of tunnel concrete in terms of impermeability and crack resistance.By controlling the content of stone powder in manufactured sand and using silane impregnation technology,the durability of tunnel concrete is enhanced.Research has found that when the content of stone powder in machine made sand is 8%,the impermeability and crack resistance of concrete reach their optimal level.This is attributed to the particle filling effect of stone powder,which improves the transition zone between cement stone and aggregate interface,enhances the overall integrity and compactness of concrete.In addition,the application of silane impregnation technology significantly improves the compactness of concrete surfaces,effectively isolates the invasion of external moisture,and enhances the impermeability of concrete.Through scanning electron microscopy observation and Vickers hardness testing,it was further confirmed that the surface of concrete impregnated with silane was denser and the hardness increased.The research results indicate that reasonable control of stone powder content in mechanism sand combined with silane impregnation technology can significantly improve the durability of tunnel concrete,prolong the service life of tunnels,and reduce maintenance costs.

关 键 词：隧道混凝土 抗渗 抗裂 机制砂 硅烷浸渍 耐久性 

分 类 号：U454[建筑科学—桥梁与隧道工程]