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<p>Promoting sustainable practices in construction, such as implementing self-healing techniques for crack mitigation, is crucial for minimizing environmental impact. This study synthesizes polyurethane-based microcapsules containing sodium silicate and evaluates their efficiency in self-healing cement mortar. The microcapsules were incorporated into cement mortar at varying dosages (0.5–5.5% by weight of cement), and their influence on mechanical, permeability, and durability properties was examined through compressive strength tests, sorptivity analysis, and acid resistance studies. The results indicate that microcapsules exhibit thermal stability up to 230&#xa0;°C. Their optimal dosage (4.5%) enhances crack healing by approximately 99.98%, increases compressive strength by 33.88%, and reduces sorptivity coefficients by 7%. However, excessive microcapsule incorporation (above 4.5%) disrupts the matrix integrity, leading to a 25.31% strength reduction. Microstructural analysis confirms that sodium silicate facilitates secondary hydration and pore refinement, improving mechanical performance and durability. Crack healing studies further highlight that submerged curing conditions significantly enhance self-healing efficiency compared to ambient conditions. These findings suggest that controlled microcapsule incorporation can effectively mitigate microcrack propagation, reduce permeability, and enhance concrete longevity, contributing to more resilient and sustainable infrastructure.</p>

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Enhanced mechanical strength and permeability in Portland pozzolana cement through optimized self-healing microcapsule dosage

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Jereena Jawahar,
  • Subha Vishnudas

摘要

Promoting sustainable practices in construction, such as implementing self-healing techniques for crack mitigation, is crucial for minimizing environmental impact. This study synthesizes polyurethane-based microcapsules containing sodium silicate and evaluates their efficiency in self-healing cement mortar. The microcapsules were incorporated into cement mortar at varying dosages (0.5–5.5% by weight of cement), and their influence on mechanical, permeability, and durability properties was examined through compressive strength tests, sorptivity analysis, and acid resistance studies. The results indicate that microcapsules exhibit thermal stability up to 230 °C. Their optimal dosage (4.5%) enhances crack healing by approximately 99.98%, increases compressive strength by 33.88%, and reduces sorptivity coefficients by 7%. However, excessive microcapsule incorporation (above 4.5%) disrupts the matrix integrity, leading to a 25.31% strength reduction. Microstructural analysis confirms that sodium silicate facilitates secondary hydration and pore refinement, improving mechanical performance and durability. Crack healing studies further highlight that submerged curing conditions significantly enhance self-healing efficiency compared to ambient conditions. These findings suggest that controlled microcapsule incorporation can effectively mitigate microcrack propagation, reduce permeability, and enhance concrete longevity, contributing to more resilient and sustainable infrastructure.