水泥基自修复微胶囊的制备及其修复效果研究

study on preparation of cement-based self-healing microcapsules and its repair effects

采用原位聚合法制备了以脲醛树脂为囊壁、环氧树脂GCC-135为囊芯的微胶囊,以抗压强度恢复率为指标评价了微胶囊的修复性能,研究了干燥养护、浸水养护(干养、湿养)条件下不同微胶囊掺量(水泥质量的0、1.5%、3.0%、4.5%、6.0%)对砂浆试件的修复效果。结果表明:在干养、湿养条件下,随着微胶囊掺量的增加,试件的抗折强度、抗压强度均降低;在不同微胶囊掺量下,干养试件的抗压强度恢复率为106.60%~124.29%,湿养试件的抗压强度恢复率为98.74%~110.12%,湿养条件下的修复效果明显低于干养条件;随着微胶囊掺量的增加,其修复效果先增加后略微降低,当微胶囊掺量为4.5%时,微胶囊的修复效果最佳。

Microcapsules with urea formaldehyde resin as the wall and epoxy resin GCC-135 as the core were prepared by in-situ polymerization method.The self-healing performance of microcapsules was evaluated by using compressive strength recovery rate as an indicator.The repair effect of different microcapsule contents(0,1.5%,3.0%,4.5%,6.0%of cement mass)on mortar specimens was studied under dry curing and immersion curing(dry curing,wet curing).The results show that under dry and wet curing conditions,as the content of microcapsules increases,the flexural strength and compressive strength of the specimens decrease.Under different microcapsule contents,the compressive strength recovery rate of dry curing specimens is 106.60%~124.29%,and the compressive strength recovery rate of wet curing specimens is 98.74%~110.12%.The repair effect under wet curing conditions is significantly lower than that under dry curing.As the content of microcapsules increases,the repair effect first increases and then slightly decreases.When the content of microcapsules is 4.5%,the repair effect of microcapsules is the best.