Scholarlink

<p>This study investigates the combined effect of Quarry Dust, polyethylene terephthalate (PET) crumbs, and bacterial inoculum on the performance of sustainable concrete. Quarry Dust and PET crumbs, used as partial replacements for fine aggregates (up to 50% and 12%, respectively), aimed to improve mechanical properties and promote eco-friendly waste utilization. <i>Bacillus subtilis</i> was introduced to induce microbial-induced calcium carbonate precipitation (MICP), enabling self-healing capabilities within the concrete matrix. Concrete specimens were prepared following IS 10262:2019 mix design standards and tested for workability, compressive strength, and microstructural integrity at 7, 14, 28, and 90&#xa0;days. The optimized mix comprising 50% Quarry Dust, 12% PET crumbs, and 5&#xa0;ml bacterial inoculums achieved a peak compressive strength of 57.4&#xa0;N/mm<sup>2</sup> at 28&#xa0;days, representing a 5% improvement over conventional concrete. Crack-healing analysis showed up to 88% strength recovery at 90&#xa0;days, confirming effective bacterial-induced self-repair. Fresh concrete behavior improved with increased bio-admixture content, as evidenced by higher slump values (68–85&#xa0;mm) and compaction factors (0.78–0.85), indicating enhanced workability and mix cohesion. Microstructural analyses using SEM, XRD, and FT-IR confirmed bacterial calcite deposition, improved particle packing, and strong interfacial bonding without altering the crystalline structure. These enhancements contributed to a denser matrix and enhanced durability. This study demonstrates that incorporating <i>B. subtilis</i> to induce MICP enhances concrete’s self-healing ability, reducing degradation and reliance on manual repairs. The approach improves durability and supports long-term sustainability in construction.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Self-Healing and Sustainable Concrete: A Synergistic Approach with Waste and Microbes

  • 期刊论文

  • 发表日期：

    2025年5月26日

查看全文
  • P. Priyadharsini,
  • R. Anjali,
  • G. Venkatesan,
  • A. Anahas Perianaika Matharasi

摘要

This study investigates the combined effect of Quarry Dust, polyethylene terephthalate (PET) crumbs, and bacterial inoculum on the performance of sustainable concrete. Quarry Dust and PET crumbs, used as partial replacements for fine aggregates (up to 50% and 12%, respectively), aimed to improve mechanical properties and promote eco-friendly waste utilization. Bacillus subtilis was introduced to induce microbial-induced calcium carbonate precipitation (MICP), enabling self-healing capabilities within the concrete matrix. Concrete specimens were prepared following IS 10262:2019 mix design standards and tested for workability, compressive strength, and microstructural integrity at 7, 14, 28, and 90 days. The optimized mix comprising 50% Quarry Dust, 12% PET crumbs, and 5 ml bacterial inoculums achieved a peak compressive strength of 57.4 N/mm2 at 28 days, representing a 5% improvement over conventional concrete. Crack-healing analysis showed up to 88% strength recovery at 90 days, confirming effective bacterial-induced self-repair. Fresh concrete behavior improved with increased bio-admixture content, as evidenced by higher slump values (68–85 mm) and compaction factors (0.78–0.85), indicating enhanced workability and mix cohesion. Microstructural analyses using SEM, XRD, and FT-IR confirmed bacterial calcite deposition, improved particle packing, and strong interfacial bonding without altering the crystalline structure. These enhancements contributed to a denser matrix and enhanced durability. This study demonstrates that incorporating B. subtilis to induce MICP enhances concrete’s self-healing ability, reducing degradation and reliance on manual repairs. The approach improves durability and supports long-term sustainability in construction.