再生骨料混凝土的耐久性提升施工技术及工程应用验证

Construction Technology and Engineering Application Verification for Durability Improvement of Recycled Aggregate Concrete

摘要:

针对再生骨料混凝土因骨料高孔隙率、界面过渡区薄弱引发的耐久性不足问题,文章聚焦施工环节调控机制,通过室内试验确定再生骨料预处理工艺参数、配合比优化方案及浇筑养护协同技术,并结合市政道路基层工程试点开展应用验证。结果表明,相较于传统天然骨料混凝土,文章构建的耐久性提升施工技术体系可显著提升再生骨料混凝土的耐久性,使其每年耐久性衰减速率降至5.1%;在经济效益层面,项目累计消耗混凝土2 700 m3,共节约材料成本12.15万元。

Abstract:

In response to the issue of insufficient durability of recycled aggregate concrete caused by high porosity of aggregates and weak interface transition zones, this article focuses on the construction process regulation mechanism. Through indoor experiments, the pre-treatment process parameters, mix proportion optimization scheme, and pouring and maintenance coordination technology of recycled aggregates are determined, and application verification is carried out in conjunction with pilot projects of municipal road base engineering. The results indicate that compared to traditional natural aggregate concrete, the durability improvement construction technology system constructed in this article can significantly enhance the durability of recycled aggregate concrete, reducing its annual durability degradation rate to 5.1%. In terms of economic benefits, the project has cumulatively consumed 2 700 m3 of concrete, saving a total of 121 500 yuan in material costs.