掺入矿物和吸水树脂的轻骨料混凝土自愈性能

Self-healing properties of lightweight aggregate concrete with mineral additions and water-absorbing resins

为提高混凝土的自愈能力,设计了一种掺入矿物和吸水树脂的轻骨料混凝土.基于阻抗谱试验,对比分析不同粒径吸水树脂对混凝土自愈能力的影响,针对优选出的配合比进行阻抗谱试验和X射线衍射(X-ray diffraction,XRD)试验,评价养护龄期对混凝土自修复性能的影响.结果表明,500~600μm粒径的吸水树脂更有利于自愈能力的提升;复合自修复体系表现出长效的自愈能力.XRD试验证实了填补裂缝的愈合产物主要为碳酸钙.本研究提出的复合自修复体系具备良好的自愈性能,探索了一条拓展混凝土自愈合策略的新途径.

In order to improve the self-healing property of concrete,a lightweight aggregate concrete mixed with mineral and water-absorbing resin was designed.Based on impedance spectroscopy testing,the effects of different particle size of absorbent polymers on the self-healing property of concrete were compared.Impedance spectroscopy and X-ray diffraction(XRD)testing were carried out to evaluate the effect of curing age on the optimized mixture.The results show that the absorbent polymer with particle size between 500~600μm is more conducive to the improvement of self-healing property.The self-healing composite system demonstrates long-term self-healing capabilities.XRD testing confirms that the healing products to fill the cracks are mainly calcium carbonate.Good self-healing performance is shown in the proposed composite self-healing system.A new approach is explored to expand the self-healing strategy of concrete.