基于微波加热的热膨胀微球/石蜡/石墨自修复功能材料的制备及其在砂浆中的应用

Preparation of Thermally Expandable Microspheres/Paraffin/Graphite Self-Healing Functional Material Based on Microwave Heating and Its Application in Mortar

以热膨胀微球、石蜡和石墨为原料制备了一种快速修复混凝土裂缝的新型微波加热自修复功能材料(MHSFM)。研究了热膨胀微球掺量对MHSFM体积膨胀率的影响,测试了在微波作用下MHSFM和掺加MHSFM砂浆的升温速率,评价了MHSFM掺量对砂浆力学性能、抗渗性能和自修复性能的影响。结果表明,MHSFM的体积膨胀率随着热膨胀微球掺量增加而增大。在微波作用下,砂浆的升温速率随MHSFM掺量的增加而明显加快。MHSFM对砂浆的力学性能和抗渗性能有一定的影响,但会显著增强砂浆的自修复性能,掺加12%(质量分数)MHSFM的砂浆在微波作用下可快速愈合0.53 mm的裂缝。

A novel microwave heating self-healing functional material(MHSFM) that can quickly repair concrete cracks was prepared by using thermally expandable microspheres,paraffin,and graphite.The effect of the thermally expandable microspheres dosage on the volume expansion rate of MHSFM was studied,and the heating rates of MHSFM and mortar with MHSFM under microwave were tested.The effect of MHSFM dosage on the mechanical property,impermeability and self-healing performance of mortar was evaluated.The results show that the volume expansion rate of MHSFM gradually increases,as the dosage of thermally expandable microspheres increases.Under microwave,the heating rate of mortar increases obviously with the increase of MHSFM dosage.MHSFM has a certain effect on the mechanical property and impermeability of mortar,but it significantly enhances the self-healing performance of mortar.The mortar with 12%(mass fraction) MHSFM can quickly heal 0.53 mm crack under microwave.