Volume 40 Issue 9
Sep.  2023
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MA Yanxuan, WU Rui, GE Yajie, et al. Design and self-repair behavior of clay-cured microcapsule composite cementitious materials[J]. Acta Materiae Compositae Sinica, 2023, 40(9): 5288-5301. doi: 10.13801/j.cnki.fhclxb.20230112.002
Citation: MA Yanxuan, WU Rui, GE Yajie, et al. Design and self-repair behavior of clay-cured microcapsule composite cementitious materials[J]. Acta Materiae Compositae Sinica, 2023, 40(9): 5288-5301. doi: 10.13801/j.cnki.fhclxb.20230112.002

Design and self-repair behavior of clay-cured microcapsule composite cementitious materials

doi: 10.13801/j.cnki.fhclxb.20230112.002
Funds:  Shandong Provincial Natural Science Foundation (ZR2022 ME121); Special Project of Science and Technology Plan in 2020 of Qingdao West Coast New Area, China (2020-38); Open Research Fund of Engineering Research Center of Concrete Technology under Marine Environment, Ministry of Education (TMduracon2022010); Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (China Institute of Water Resources and Hydropower Research) (IWHR-SKL-202106); National Natural Science Foundation of China Project (51408330)
  • Received Date: 2022-10-19
  • Accepted Date: 2023-01-01
  • Rev Recd Date: 2022-12-09
  • Available Online: 2023-01-12
  • Publish Date: 2023-09-15
  • Using the round pot granulation method, through the design and optimization of the microcapsule process and formulation parameters, microcapsules with clay solidifying agent, bentonite, MgO expansion agent and microcrystalline cellulose as the core material and ethyl cellulose (EC) as the core material were prepared. For the microcapsules of the wall material, the influence of the components of the microcapsule core material on the self-healing effect of the self-healing microcapsule/cementitious composite material was explored by orthogonal experiments, and the optimal composition of the microcapsule core material was determined: That is, the clay curing agent is 10wt% , MgO expansion agent is 35wt%, microcrystalline cellulose is 6wt%, and bentonite is 49wt%. The results show that the compressive strength of self-healing microcapsule/cementitious composite decreases with the increase of the content of microcapsules. When the content (mass to cement) of microcapsules is 3%, the compressive strength of self-healing microcapsule/cementitious composite is only dropped by 4% with a high strength recovery rate of 103.8%. The deformation behavior of self-healing microcapsule/cementitious composites during loading was traced and tested by the digital speckle correlation method (DSCM). From the stress-strain curve, strain field distribution, gray correlation coefficient eigenvalues (Stc) and strain eigenvalues (Sts), the self-healing mechanism of self-healing microcapsule/cementitious composite is based on the fact that when the microcapsules rupture, the cement-based homologous substances (AFt, Mg(OH)2) are generated to fill the cracks, limit the development of cracks, and achieve the purpose of repairing cracks.

     

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