Quantitative Characterization Method of Crack Self-Healing Effect of Cement-Based Materials Based on Contact Resistance Theory

Abstract

Abstract: The self-healing effect of cracks is an important basis for evaluating the level of functional recovery of materials. To realize the comprehensive evaluation of the full-section repair effect of cracks in cement-based materials, research on crack self-healing evaluation methods based on contact resistance theory had been carried out, including the selection and optimization of conductive materials, the optimization of test parameters, and the derivation of calculation methods. The results show that 0.3% volume dosage carbon fiber can effectively reduce the resistivity of cement-based materials and simultaneously improve mechanical properties. The measured voltage has no significant effect on the resistivity. The resistivity gradually decreases with the increase of contact pressure. The self-healing process of cracks is the process of changing the contact form of crack surface, which is also accompanied by changes in the contact resistance. According to this, a quantitative calculation formula for contact resistance and self-healing effect can be established. This method is only related to the accumulation of repair products on the crack surface, and is not affected by the spatial distribution of the products. The conclusions provide a reference for the quantitative characterization of the self-healing effect of cement-based materials.

Key words: crack repair rate, resistivity, contact resistance, quantitative characterization, self-healing concrete, product distribution

CLC Number:

TU528.44

ZHANG Xuan, FU Changhao, ZHAN Qiwei, SU Yilin, PAN Zhihong. Quantitative Characterization Method of Crack Self-Healing Effect of Cement-Based Materials Based on Contact Resistance Theory[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 1950-1959.

References

[1] SANGADJI S. Can self-healing mechanism helps concrete structures sustainable?[J]. Procedia Engineering, 2017, 171: 238-249.
[2] WU X T, HUANG H L, LIU H, et al. Artificial aggregates for self-healing of cement paste and chemical binding of aggressive ions from sea water[J]. Composites Part B: Engineering, 2020, 182: 107605.
[3] 韦建刚, 陈荣, 黄伟, 等. 静水压力下超高性能混凝土的抗氯离子渗透性能[J]. 硅酸盐通报, 2022, 41(8): 2706-2715+2747.
WEI J G, CHEN R, HUANG W, et al. Chloride penetration resistance of ultra-high performance concrete under hydrostatic pressure[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(8): 2706-2715+2747 (in Chinese).
[4] KWON S J, NA U J, PARK S S, et al. Service life prediction of concrete wharves with early-aged crack: probabilistic approach for chloride diffusion[J]. Structural Safety, 2009, 31(1): 75-83.
[5] ZHANG W, ZHENG Q F, ASHOUR A, et al. Self-healing cement concrete composites for resilient infrastructures: a review[J]. Composites Part B: Engineering, 2020, 189: 107892.
[6] SNOECK D, STEUPERAERT S, VAN TITTELBOOM K, et al. Visualization of water penetration in cementitious materials with superabsorbent polymers by means of neutron radiography[J]. Cement and Concrete Research, 2012, 42(8): 1113-1121.
[7] WIKTOR V, JONKERS H M. Quantification of crack-healing in novel bacteria-based self-healing concrete[J]. Cement and Concrete Composites, 2011, 33(7): 763-770.
[8] MUHAMMAD N Z, SHAFAGHAT A, KEYVANFAR A, et al. Tests and methods of evaluating the self-healing efficiency of concrete: a review[J]. Construction and Building Materials, 2016, 112: 1123-1132.
[9] WANG A H, ZHAN Q W, FU C H, et al. Study on improving the self-repairing effect of cement-based materials by microbial mineralization coupled with inorganic minerals[J]. Case Studies in Construction Materials, 2022, 17: e01279.
[10] PARK B, CHOI Y C. Quantitative evaluation of crack self-healing in cement-based materials by absorption test[J]. Construction and Building Materials, 2018, 184: 1-10.
[11] NGUYEN T H, GHORBEL E, FARES H, et al. Bacterial self-healing of concrete and durability assessment[J]. Cement and Concrete Composites, 2019, 104: 103340.
[12] EDVARDSEN C. Water permeability and autogenous healing of cracks in concrete[M]//Innovation in concrete structures: Design and construction. Thomas Telford Publishing, 1999: 473-487.
[13] LING H, QIAN C X. Effects of self-healing cracks in bacterial concrete on the transmission of chloride during electromigration[J]. Construction and Building Materials, 2017, 144: 406-411.
[14] VIJAY K, MURMU M. Self-repairing of concrete cracks by using bacteria and basalt fiber[J]. SN Applied Sciences, 2019, 1(11): 1-10.
[15] WANG J Y, DEWANCKELE J, CNUDDE V, et al. X-ray computed tomography proof of bacterial-based self-healing in concrete[J]. Cement and Concrete Composites, 2014, 53: 289-304.
[16] LI E W, DU W, ZHUANG R H, et al. Preparation and characterization of electromagnetic-induced rupture microcapsules for self-repairing mortars[J]. Materials, 2022, 15(10): 3608.
[17] SUNDAY OBAYI C, SUNDAY NNAMCHI P. Exploits, advances and challenges in characterizing self-healing materials[J]. Advanced Functional Materials, 2020.
[18] VAN TITTELBOOM K, WANG J Y, ARAúJO M, et al. Comparison of different approaches for self-healing concrete in a large-scale lab test[J]. Construction and Building Materials, 2016, 107: 125-137.
[19] 国家市场监督管理总局, 国家标准化管理委员会. 水泥胶砂强度检验方法(ISO法): GB/T 17671—2021[S]. 北京: 中国标准出版社, 2021.
State Administration for Market Regulation, Standardization Administration. Test method of cement mortar strength (ISO method): GB/T 17671—2021[S]. Beijing: Standards Press of China, 2021 (in Chinese).
[20] DING Y, YANG Y, LIU R G, et al. Study on pressure sensitivity of smart polymer concrete based on steel slag[J]. Measurement, 2019, 140: 14-21.
[21] FU X, CHUNG D D L. Effects of water-cement ratio, curing age, silica fume, polymer admixtures, steel surface treatments and corrosion on the bond between concrete and steel reinforcing bar[J]. ACI Materials Journal, 1998, 95(6): 725-734.
[22] 郭凤仪, 陈忠华. 电接触理论及其应用技术[M]. 北京: 中国电力出版社, 2008: 10.
GUO F Y, CHEN Z H. Electrical contact theory and its application technology[M]. Beijing: China Electric Power Press, 2008: 10 (in Chinese).