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

Abstract

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

CLC Number:

TQ172.1

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.

References

[1] ESCOBAR M M, VAGO S, VÁZQUEZ A. Self-healing mortars based on hollow glass tubes and epoxy-amine systems[J]. Composites Part B: Engineering, 2013, 55: 203-207.
[2] REN Y M, ABBAS N, ZHU G M, et al. Synthesis and mechanical properties of large size silica shell microcapsules for self-healing cementitious materials[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2020, 587: 124347.
[3] WANG X G, CHEN Z F, XU W, et al. Fluorescence labelling and self-healing microcapsules for detection and repair of surface microcracks in cement matrix[J]. Composites Part B: Engineering, 2020, 184: 107744.
[4] DONG B Q, FANG G H, DING W J, et al. Self-healing features in cementitious material with urea-formaldehyde/epoxy microcapsules[J]. Construction and Building Materials, 2016, 106: 608-617.
[5] 王信刚,周镇,赵华,等.环氧树脂修复水泥基材料微裂缝的渗透机理[J/OL].建筑材料学报:1-13[2021-03-04].http://kns.cnki.net/kcms/detail/31.1764.tu.20201106.0847.002.html.
WANG X G, ZHOU Z, ZHAO H, et al. Capillary transport mechanism of epoxy resin repairing micro-cracks in cement-based materials[J/OL]. Journal of Building Materials: 1-13[2021-03-04]. http://kns.cnki.net/kcms/detail/31.1764.tu.20201106.0847.002.html (in Chinese).
[6] GARDNER D, JEFFERSON A, HOFFMAN A. Investigation of capillary flow in discrete cracks in cementitious materials[J]. Cement and Concrete Research, 2012, 42(7): 972-981.
[7] HONG S X, YAO W Q, GUO B W, et al. Water distribution characteristics in cement paste with capillary absorption[J]. Construction and Building Materials, 2020, 240: 117767.
[8] LIANG K, ZENG X H, ZHOU X J, et al. Investigation of the capillary rise in cement-based materials by using electrical resistivity measurement[J]. Construction and Building Materials, 2018, 173: 811-819.
[9] MARTYS N S, FERRARIS C F. Capillary transport in mortars and concrete[J]. Cement and Concrete Research, 1997, 27(5): 747-760.
[10] YOUNG W B. Analysis of capillary flows in non-uniform cross-sectional capillaries[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2004, 234(1/2/3): 123-128.
[11] HANŽIČ L, KOSEC L, ANŽEL I. Capillary absorption in concrete and the Lucas-Washburn equation[J]. Cement and Concrete Composites, 2010, 32(1): 84-91.
[12] BAO J W, WANG L C. Capillary imbibition of water in discrete planar cracks[J]. Construction and Building Materials, 2017, 146: 381-392.

[1]	ZHANG Yi, ZHU Yanmei, REN Qiang, JIANG Zhengwu. Progress on 3D Printing Construction Technology and Its Cement-Based Materials [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 1796-1807.
[2]	WANG Dongli, YANG Ce, PAN Huimin, LI Tong, CHI Yaao, XU Zehua. Research Progress on Relationship Between Pore Structure and Water Absorption Performance of Cement-Based Materials [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1420-1428.
[3]	HOU Shengjun, JIANG Chenchen, TANG Weiyu, TAO Wenjiang, AN Xuehui, MA Jiajun. Workability and Mechanical Properties of Polymer Modified Self-Compacting Concrete [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1489-1496.
[4]	GONG Jianqing, LI Falei, LI Ke, QU Zhigang. Effects of Active Admixtures on Comprehensive Properties of Epoxy Resin Repair Mortar [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1137-1146.
[5]	LIU Rong, CHEN Guo, LI Liangfeng, GAO Pengfei, WANG Yuping. Preparation and Thermal Conductivity of ZnO/EP Composites [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1370-1377.
[6]	TANG Yujuan, ZUO Xiaobao, YIN Guangji, TONG Xiaofang, XU Fei. Solid-Liquid Equilibrium Equation of Cement-Based Materials under Leaching of Ammonium Chloride [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 741-749.
[7]	SHI Tianyao, CHEN Xingyu, ZHANG Min, LIU Qian. Mechanism of Chloride Binding and Its Influence Factors inCement-Based Materials [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 13-24.
[8]	ZHU Haowei, LIU Changwu, CHEN Xiaoqiang, ZHAO Chao. Experimental Study on Mortar Materials with Fissures Filled withHigh Permeability Modified Epoxy Resin [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 77-82.
[9]	YANG Lin, ZHANG Yunsheng, ZHANG Chunxiao. Water Transport and Permeability Coefficient Calculation for Unsaturated Cement-Based Materials Based on X-CT [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3775-3782.
[10]	ZHAN Pei-min;SUN Bin-xiang;HE Zhi-hai;ZHANG Chang-yang;PAN Shu-ping. Research Progress of Effect of Nano-calcium Carbonate on the Properties of Cement-based Materials [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2018, 37(3): 881-887.
[11]	ZHAN Pei-min;HE Zhi-hai;ZHANG Chang-yang;FANG Ke-nan;YANG Yi-fan. Application and Research Progress of Nano-Titanium Dioxide in the Field of Cement-based Materials [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2018, 37(3): 894-902.
[12]	MO Zong-yun;LIU Yi-liang;WANG Da-guang;LI Zong-jie;BAI Li-gai. Research Progress on the Physical Properties of Cement-Based Materials Blended with Metakaolin [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2018, 37(3): 911-917.
[13]	LI Na;WEI Lian-yu;ZHANG Jing. Self-healing Properties of Micro-cracks of Cement Stabilized Macadam Based on Microstructure Analysis [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2018, 37(2): 578-585.
[14]	WANG Chong;ZHOU Ying;HUANG Qian. Effect of Electrical Field and Sulfate on Cement-based Materials under Soil Environment and Its Mechanism [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2017, 36(9): 3057-3063.
[15]	HUANG Zhan-wei;CHEN Wei;LI Qiu;WANG Meng;FAN Jian-feng. Mechanical Properties and Microstructure of Waterborne Epoxy Resin Modified Cement Mortar [J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2017, 36(8): 2530-2535.