海绵城市理论下透水再生骨料混凝土研究进展

Research progress of permeable recycled aggregate concrete based on sponge city theory

再生骨料的研究及透水混凝土的应用是建筑行业绿色发展的有效方式。透水再生混凝土(PRAC)作为环境友好型混凝土,将海绵城市绿色理念及废弃物资源再利用理念结合,实现了建筑行业绿色健康可持续发展。但透水混凝土强度普遍较低,而再生骨料由于其孔隙率及表观密度小等原因会降低混凝土强度。本文总结了水胶比、孔隙率、再生骨料的粒径大小、颗粒级配、替代率及外掺纤维等因素对透水再生骨料混凝土的基本力学性能、透水性能及耐久性能的影响,分析其对再生骨料透水混凝土改性的机理,并提出现阶段存在的一些问题和对未来发展方向的展望。

The research of recycled aggregates and the application of permeable concrete are effective ways for the green development of the construction industry. Permeable Recycled Concrete(PRAC), as an environmentally friendly concrete, combines the green concept of sponge city with the concept of waste resource reuse, and realizes the green and healthy sustainable development of the construction industry. However, the strength of permeable concrete is generally low, and recycled aggregate will reduce the strength of concrete due to its low porosity and apparent density. This paper summarizes the effects of water-binder ratio and porosity, particle size of recycled aggregate, particle size distribution and replacement rate, and fiber addition on the basic mechanical properties, water permeability and durability of permeable recycled aggregate concrete. Analysis The mechanism of the modification of recycled aggregate permeable concrete, and some problems existing in the emergence stage and the prospect of future development direction are also mentioned.