甲烷有机硅改性水泥基材料修复农村公路路面技术研究

Research on Repairing Technology of Rural Highway Pavement with Methane-organosilicon Modified Cement-based Material

摘要:

随着农村经济的快速发展，大量基层公路面临快速抢修、防渗耐久、抗裂抗渗等修复工程。为探究有机硅改性水泥基材料对农村公路的施工修复效果，以填隙率为控制指标设计了不同掺量下单基团有机硅外加剂（甲烷硅酸钠，MAS）改性水泥材料，并应用于道路修复，通过单轴压缩试验、水滴接触角测试试验、电镜微观扫描（SEM）试验探究注浆加固后路面的宏观力学行为和抗渗防水微观机理。结果显示：公路结构强度随甲烷有机硅掺量的增加而不断降低，在初始强度损失不超过3.9 MPa下甲烷有机硅量掺量推荐不超过1.0%；当掺量控制在0.5%附近时，甲烷有机硅可显著提升改性加固刚度，修复后公路耐久承载能力可提高5.82%，抗渗防水能力可提升9.31 倍。

Abstract:

With the rapid development of rural economy, a large number of grassroots roads are facing the rapid emergency repairs, anti-seepage and durability, anti-cracking and anti-seepage and other repair projects. In order to explore the construction and repair effect of organosilicone-modified cement-based materials on rural roads, the cement materials modified with single-group organosilicone admixtures (sodium methane silicate, MAS) of different dosages are designed with the gap rate as the control index and applied to road repair. The uniaxial compression test, water dropping contact angle test and scanning electron microscope (SEM) test are conducted to explore the macroscopic mechanical behavior and the microscopic mechanism of impermeability and waterproofing of the pavement after grouting reinforcement. The results show that the strength of highway structure continuously decreases with the increase of methane-organosilicon content. It is recommended that the methane-organosilicon content does not exceed 1% when the initial strength loss does not exceed 3.9 MPa. When the content is controlled about 0.5%, the methane-organosilicon can obviously improve the stiffness of modification and reinforcement. After the repair, the durable load-bearing capacity of the highway can be increased by 5.82%, and the anti-seepage and waterproofing capacity can be enhanced by 9.31 times.