环氧树脂修复水泥基材料离散微裂缝的渗透动力学研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (7): 2184-2190.

环氧树脂修复水泥基材料离散微裂缝的渗透动力学研究

王信刚, 李玉洁, 周镇

南昌大学建筑工程学院,南昌 330031

收稿日期:2021-01-19 修回日期:2021-03-04 出版日期:2021-07-15 发布日期:2021-08-04
作者简介:王信刚(1977—),男,博士,教授。主要在从事土木工程材料方面的研究。E-mail:wxglab@126.com
基金资助:
国家自然科学基金(52062032,51972158);江西省主要学科学术和技术带头人(20204BCJ22001);江西省研究生创新专项资金项目(YC2020-S041)

Capillary Transport Kinetics of Epoxy Resin Repairing Discrete Microcracks in Cement-Based Materials

WANG Xingang, LI Yujie, ZHOU Zhen

School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China

Received:2021-01-19 Revised:2021-03-04 Online:2021-07-15 Published:2021-08-04

摘要/Abstract

摘要： 为研究自修复微胶囊芯材(环氧树脂)修复水泥基材料微裂缝的动态毛细渗透过程,采用光学接触角测量仪测量环氧树脂接触角及表面张力,采用自动升温旋转流变仪测量环氧树脂动力粘度,利用修正后的Lucas-Washburn方程(简称L-W方程)分析微裂缝宽度和环氧树脂自身重力对动态渗透过程的影响。结果表明:环氧树脂修复剂在水泥基材料微裂缝的渗透速率先快后慢,且渗透速率与裂缝宽度有关;修复剂在微裂缝内渗透时自身重力影响不能被忽略;修正后的L-W方程可以十分准确地预测微裂缝宽度为0.05 mm时修复剂的动态渗透过程,其偏差程度在0.9%以内;当微裂缝宽度为0.10 mm时,理论值与试验值偏差程度也仅为11.9%。

关键词: 环氧树脂, 水泥基材料, 自修复, 动态渗透过程, Lucas-Washburn方程

Abstract: To investigative the dynamic capillary transport process of self-healing microcapsule core material (epoxy resin) to repair microcracks in cement-based materials, contact angle and surface tension of epoxy resin were measured by optical contact angle measuring instrument, and dynamic viscosity of epoxy resin was measured by automatic heating rotary rheometer. The modified Lucas-Washburn equation (L-W equation) was used to analyze the influence of microcracks width and epoxy resin’s gravity on the dynamic capillary transport process. The results show as follows, the capillary transmission speed of epoxy resin in microcracks is faster at first and then slower, and the capillary transmission speed is related to the width of cracks. The effect of the repair agent gravity cannot be ignored in dynamic capillary transport process. When the microcrack width is 0.05 mm, the dynamic capillary transmission process is predicted accurately by the modified L-W equation, and the deviation is within 0.9%. When the microcrack width is 0.10 mm, the deviation between the theoretical value and experimental value is only 11.9%.

Key words: epoxy resin, cement-based material, self-healing, dynamic capillary transport process, Lucas-Washburn equation

中图分类号:

TQ172.1

王信刚, 李玉洁, 周镇. 环氧树脂修复水泥基材料离散微裂缝的渗透动力学研究[J]. 硅酸盐通报, 2021, 40(7): 2184-2190.

WANG Xingang, LI Yujie, ZHOU Zhen. Capillary Transport Kinetics of Epoxy Resin Repairing Discrete Microcracks in Cement-Based Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2184-2190.

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