3%水泥改良红砂岩填筑高速公路基层的施工工艺与质量控制

Construction Technology and Quality Control of Using 3% Cement to Improve Red Sandstone for Filling the Base Layer of Highways

摘要:

红砂岩是我国南方高速公路建设中常用的区域性筑路材料,就地取材的优势十分显著,但存在遇水崩解、强度软化、水稳定性差等弊端,直接填筑高速公路基层易引发沉降、开裂等病害。采用3%掺量的水泥对红砂岩进行改良,可通过水泥水化反应优化材料力学性能,弥补原生红砂岩的工程缺陷。文章结合现行公路施工规范与现场工程实践,系统阐述了3%水泥改良红砂岩的作用机理、标准化施工工艺流程及全过程质量控制要点。实践表明,3%的水泥掺量可平衡工程性能与经济效益,改良后的红砂岩基层各项指标满足高速公路设计要求,施工工艺成熟稳定,可为红砂岩地区同类道路工程施工提供技术参考。

Abstract:

Red sandstone is a commonly used regional road building material in the construction of highways in southern China. It has significant advantages in using local materials, but it has disadvantages such as water disintegration, strength softening, and poor water stability. Directly filling the base layer of highways can easily cause settlement, cracking, and other diseases. By using a 3% cement content to improve red sandstone, the mechanical properties of the material can be optimized through cement hydration reaction, which compensates for the engineering defects of native red sandstone. The article combines current highway construction standards and on-site engineering practices to systematically explain the mechanism, standardized construction process, and key quality control points of 3% cement modified red sandstone. Practice has shown that a cement content of 3% can balance engineering performance and economic benefits. The improved red sandstone base meets the design requirements of highways in various indicators, and the construction technology is mature and stable. It can provide technical reference for similar road construction projects in red sandstone areas.