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Incorporation of bacteria into the Cementitious composite using different carrier has been reported to be an efficient approach for Microorganism-based self-healing. However, the literature does not mention the utilisation of hard gelatin capsules. Thus, the feasibility of hard gelatin capsules as a novel microorganism carrier via immobilization of Bacillus subtilis was demonstrated in this study. Gelatin capsules coated with two types of coating were employed that is (a) epoxy coating and (b) Epoxy + Tape coating on the capsules filled with microorganisms and were examined in cementitious composite. 3 discs of the size of 85 mm diameter and 50 mm depth were cast and cured for 7 days for each mix. After 7 days of curing, discs were bifurcated using a split tensile test and encased in the PVC pipe. The specimens were then immersed in water to assess the healing effect at 3, 7, and 14 days with the help of a crack-width sensing camera. Based on the observation, it was deduced that the healing effect was significantly efficient in healing containing epoxy-coated capsules filled with microorganisms.

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Healing of Cracked Cementitious Composite Through Microorganism-Based Agent Encapsulated with Varying Techniques

  • 会议论文

  • 发表日期：

    2026年

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  • Sadaqat Ullah Khan,
  • Tehmina Ayub,
  • Bilal Ahmed

摘要

Incorporation of bacteria into the Cementitious composite using different carrier has been reported to be an efficient approach for Microorganism-based self-healing. However, the literature does not mention the utilisation of hard gelatin capsules. Thus, the feasibility of hard gelatin capsules as a novel microorganism carrier via immobilization of Bacillus subtilis was demonstrated in this study. Gelatin capsules coated with two types of coating were employed that is (a) epoxy coating and (b) Epoxy + Tape coating on the capsules filled with microorganisms and were examined in cementitious composite. 3 discs of the size of 85 mm diameter and 50 mm depth were cast and cured for 7 days for each mix. After 7 days of curing, discs were bifurcated using a split tensile test and encased in the PVC pipe. The specimens were then immersed in water to assess the healing effect at 3, 7, and 14 days with the help of a crack-width sensing camera. Based on the observation, it was deduced that the healing effect was significantly efficient in healing containing epoxy-coated capsules filled with microorganisms.