In general, cracks significantly deteriorate the in-situ performance of concrete members and structures, especially in urban metro tunnels that have been embedded in saturated soft soils. The microcapsule self-healing method is a newly developed healing method for repairing cracked concrete. To investigate the optimal microcapsule parameters that will have the best healing effect in concrete, a 3D analytical probability healing model is proposed; it is based on the microcapsule self-healing method\' s healing mechanism, and its purpose is to predict the healing efficiency and healing probability of given cracks. The proposed model comprehensively considers the radius and the volume fraction of microcapsules, the expected healing efficiency, the parameters of cracks, the broken ratio and the healing probability. Furthermore, a simplified probability healing model is proposed to facilitate the calculation. Then, a Monte Carlo test is conducted to verify the proposed 3D analytical probability healing model. Finally, the influences of microcapsules\' parameters on the healing efficiency and the healing probability of the microcapsule self-healing method are examined in light of the proposed probability model.
Key Words
self-healing; microcapsule; crack healing; 3D analytical probability healing model
Address
Hehua Zhu and Zhiguo Yan — State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University,1239 Siping Road, Shanghai 200092, China
Hehua Zhu, Shuai Zhou, Zhiguo Yan, Woody Ju and Qing Chen — Department of Geotechnical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
Hehua Zhu, Shuai Zhou, Zhiguo Yan and Qing Chen — Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, 1239 Siping Road, Shanghai 200092, China
Shuai Zhou and Woody Ju — Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, USA
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