再生混凝土力学性能的研究进展

Research Progress in the Mechanical Properties of Recycled Aggregate Concrete

再生混凝土的应用,不仅能够解决废弃混凝土处理问题;又能降低因资源过度开采所引起的生态环境破坏,因而具有广阔的发展前景。相比于普通混凝土,再生混凝土的抗压强度、弹性模量以及抗疲劳性能较低,主要与再生骨料多方面因素的影响有关。对近年来再生混凝土力学性能相关研究进展进行了综述,再生骨料总吸水率是降低抗压强度的主要原因,疲劳性能则主要与再生骨料取代率和附着砂浆含量有关。在再生混凝土中掺加矿物掺合料能够改善新、旧双界面从而提高抗压强度和劈裂抗拉强度,掌握多个因素的影响和作用对再生骨料和再生混凝土进一步研究和应用具有重要意义。

The use of recycled aggregate concrete in civil engineering can solve related environmental problems and save natural resources. Compared with normal concrete, mechanical properties of recycled aggregate concrete, such as strength, elastic modulus, and fatigue resistance, are poor. In this paper, effects of recycled aggregates on mechanical properties of recycled aggregate concrete were reviewed. The total water absorption of recycled aggregate contributed to lower compressive strength, and fatigue resistance mainly depends on aggregate substitution ratio and content of attached mortar. Mineral admixtures added to recycled aggregate concrete can improve new and old interra- cial transitional zones, increase compressive strength and spilit tensile strength. Thus, understanding the different factors and mechanisms influencing recycled aggregate and recycled aggregate concrete is of great significance to their further research and applications.