低碳地聚物胶凝材料在公路混凝土防撞墙修复中的应用研究

Research on Application of Low-carbon Geopolymer Cementitious Materials in Repair of Highway Concrete Crash Barriers

摘要:

随着服役年限的增长，以及与环境荷载的耦合作用，公路混凝土结构物的耐久性劣化问题日益突出。传统水泥基修复材料在黏结性能、抗侵蚀能力和环境友好性方面存在固有局限。以甘肃省S304线关山路段混凝土防撞墙氯盐腐蚀病害为工程背景，系统研究了一种基于工业固废资源化利用的新型修复材料——低碳地聚物胶凝材料的工程应用特性。通过室内试验与现场检测相结合，系统评价了该材料的力学性能、耐久性能和施工适应性。工程应用表明，该材料28 d的黏结强度达到1.86 MPa；相较于普通水泥砂浆，该材料的抗氯离子渗透系数降低62.3%；相较于普通硅酸盐水泥，该材料的全生命周期碳排放降低72.5%。研究成果为高寒、高盐环境下公路混凝土结构物的快速修复与绿色养护，提供了创新技术路径与工程实践参考。

Abstract:

The durability deterioration of highway concrete structures has become increasingly prominent with the extension of service life and the coupling effects of environmental loads. Traditional cement?based repair materials exhibit inherent limitations in bonding performance, erosion resistance, and environmental friendliness. Taking the chloride?salt corrosion damage of concrete crash barriers on the Guanshan section of the S304 provincial highway in Gansu Province as the engineering background, the engineering application characteristics of a new type of repair material based on the resource utilization of industrial solid waste - low-carbon geopolymer cementitious material are systematically studied. By combining laboratory tests with field inspections, the mechanical properties, durability and construction adaptability of this material are comprehensively evaluated. Engineering application results show that the 28?day bonding strength reaches 1.86 MPa. Compared with ordinary cement mortar, the chloride ion permeability coefficient of this material is reduced by 62.3%, and compared with ordinary Portland cement, its life?cycle carbon emissions are lowered by 72.5%. The research findings provide innovative technical paths and practical engineering references for the rapid repair and green maintenance of highway concrete structures in high?altitude and high?salinity environments.