再生混凝土力学及抗氯离子渗透性能研究现状

Research status of mechanical properties and resistance to chloride ion penetration of recycled aggregate concrete

再生混凝土作为一种低碳、环保、绿色新型材料,符合国家可持续发展战略。减少山砂、山石开采,改变对废弃混凝土填埋的处理方式,可节约土地资源。力学性能是混凝土结构根本问题,关乎结构安全性;氯离子侵蚀导致钢筋锈蚀、混凝土保护层开裂,影响结构使用寿命和安全性;两种性能对混凝土结构至关重要。而废弃混凝土因加工工艺问题,使得再生骨料孔隙率高于天然骨料,其性能较普通混凝土有所差异。通过研读国内外文献,综述了再生混凝土力学性能及其抗氯离子渗透性能研究现状,并进一步提出了再生混凝土研究方向。

As a low-carbon,environmentally friendly,green new materials,recycled aggregate concrete is consistent with national sus- tainable development strategies.The reduction of the mountain of sand and rocks mining, changes to the handling of landfill waste concrete are helpful to the conservation of land resources.Mechanical properties is the fundamental problem of concrete structure which is related to the structural safety.The chloride ion attack is a major factor influencing the steel corrosion and the the protective layer of concrete crack- ing which is affective to the structural life and safety.This two properties is essential to the concrete structure.The properties of recycled ag- gregate concrete are different than those of normal concrete due to its process issues which makes the recycled aggregate porosity higher than that of natural aggregate.Through the study of the references at home and abroad, it mainly reviewed the the research status of mechanical properties and resistance to chloride ion penetration of recycled aggregate concrete and, proposed further research trends.