工业固废基混凝土收缩研究及应用进展

Advances in research and application of shrinkage in industrial solid waste-based concrete

  • 摘要: 工业固废基混凝土在固废资源利用和减碳方面表现出显著优势,但收缩开裂问题严重制约了其工程应用。系统梳理国内外相关研究成果,剖析了混凝土收缩类型及成因,自收缩和干燥收缩为工业固废基混凝土的主要收缩类型;综述了外加剂、激发剂、纤维、内养护剂及多固废协同等改性技术对自收缩和干燥收缩的抑制效果,四类工业固废基混凝土28d收缩控制效果分别可达24.1%~87.5%、13.6%~71.6%、17.6%~69.5%、17.2%-45.6%,多固废协同改性技术展现出广阔发展前景;从火山灰效应、微集料填充、孔结构优化及界面过渡区改善等方面阐述了工业固废对混凝土收缩机制的影响;另外,总结了工业固废基混凝土在道路、桥梁、水利、隧道(巷道)及砌体等领域的工程应用现状,强调了在生命周期碳足迹、能耗及成本方面的优势,并概述了碳化加速与收缩开裂等风险的防控措施;评述了现有经验统计、机理、半经验半机理及数据驱动四类收缩预测模型的适用性与修正方法;最后,探讨了工业固废基混凝土的未来发展和研究方向。

     

    Abstract: Industrial solid waste-based concrete exhibits significant advantages in solid waste utilization and carbon reduction; however, shrinkage cracking severely limits its engineering applications. This paper systematically reviews relevant research progress both domestically and internationally, analyzing the types and causes of concrete shrinkage. Autogenous shrinkage and drying shrinkage are identified as the primary shrinkage types of industrial solid waste-based concrete. This review summarizes modification strategies—including admixtures, activators, fibers, internal curing agents, and multi-solid waste synergy—for mitigating autogenous and drying shrinkage in solid waste-based concretes. The 28-day shrinkage reduction achieved by the four categories of concretes ranges from 13.6% to 87.5%, with multi-solid waste synergy showing the greatest potential for future application. The influence mechanisms of industrial solid wastes on concrete shrinkage are elaborated from the perspectives of the pozzolanic effect, micro-aggregate filling effect, pore structure optimization, and improvement of the interfacial transition zone. Furthermore, the current engineering applications of industrial solid waste-based concrete in roads, bridges, hydraulic structures, tunnels (roadways), and masonry are summarized, highlighting its advantages in life-cycle carbon footprint, energy consumption, and cost, and outlining risk control measures for accelerated carbonation and shrinkage cracking. The applicability and modification methods of four categories of shrinkage prediction models—empirical statistical models, mechanistic models, semi-empirical–mechanistic models, and data-driven models—are also reviewed. Finally, the future development trends and research directions of industrial solid waste-based concrete are discussed.

     

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