| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Self-Healing Performance of Mortar Crack Under Different Sustained Load and Its Evaluation Index |
| LI Shuangjie, MA Kunlin*, LONG Guangcheng, XIE Youjun, ZENG Xiaohui
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| School of Civil Engineering, Central South University, Changsha 410075, China |
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Abstract In this work, the influence of different sustained loads on self-healing effectiveness of the mortar crack with the pre-cracking ages 7 d and 8 d were investigated by adding super absorbent polymer (SAP) into the mortar, prefabricating cracks on the mortar and taking the indexes of surface crack healing rate (γ) and strength recovery rate (η) to evaluate the self-healing effects of the mortar cracks. Results show that the self-healing effectiveness of the mortar crack with pre-cracking 7 d age are better than that of the mortar with pre-cracking 28 d age. Sustained compressive load is beneficial to the self-healing of mortar crack. The η of specimen with sustained compressive load is 3.2% (pre-cracked at 7 d) and 9.3% (pre-cracked at 28 d) higher than that of specimen without load, respectively. However, sustained flexural load and torque load take disadvantage of the self-healing of mortar crack. The η of specimen with sustained flexural load is 43.5% (pre-cracked at 7 d) and 47.3% (pre-cracked at 28 d) lower than that of the specimens without load. Microscopic tests show that the self-healing products in mortar cracks are mainly calcium carbonate, which mainly exists near the crack surface. Therefore, it is possible to overestimate the self-healing effectiveness by taking γ as a evaluation index.
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Published: 10 March 2023
Online: 2023-03-14
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| Fund:National Key Research and Development Program (2017YFB201204). |
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2023, Vol. 37 
