Scholarlink

<p>The construction industry requires sustainable high-performance materials, as cement production contributes approximately 8% of global CO₂ emissions. This study presents a fiber-optimized high-strength self-compacting concrete (SCC) incorporating fly ash and silica fume as partial cement replacements, focusing on rheological behavior, mechanical performance, microstructural evolution, and life-cycle sustainability. A total of 40% cement replacement was achieved using 160&#xa0;kg/m³ fly ash and 40&#xa0;kg/m³ silica fume, while polypropylene fibers were incorporated at 0.02%, 0.04%, 0.06%, and 0.08% by volume to identify the optimum fiber dosage that balances flowability and strength. Fresh properties were evaluated using slump flow, L-box, and V-funnel tests, while mechanical properties were assessed through compressive, split tensile, and flexural strength tests at 7, 14, and 28 days. Microstructural characteristics were examined using XRD, FTIR, TGA/DTA, and SEM–EDS analyses. The results demonstrate that an optimal fiber dosage of 0.06% yields superior performance, achieving compressive, split tensile, and flexural strengths of 74.85&#xa0;MPa, 6.46&#xa0;MPa, and 5.79&#xa0;MPa, respectively, representing improvements of 8.3%, 11.0%, and 6.8% over the control mix. Microstructural analysis confirms enhanced C–S–H formation, pore refinement, and effective fiber bridging. Life-cycle assessment quantified environmental performance across six impact categories, revealing that the integration of 40% supplementary cementitious materials reduced global warming potential by 34.6% (from 791.83 to 517.86&#xa0;kg CO₂-eq/m³) and primary energy demand by 31.3% (from 8643.38 to 5938&#xa0;MJ/m³) relative to conventional concrete. Fiber-reinforced variants exhibited minimal environmental variation across all categories—global warming potential ranged 517.07–517.86&#xa0;kg CO₂-eq/m³, acidification potential 4.580–4.589&#xa0;kg SO₂-eq, and eutrophication potential 0.744–0.754&#xa0;kg PO₄³⁻-eq.&#xa0;Economic evaluation demonstrates that the optimal mix achieved production costs of ₹7366.08/m³ with superior cost-performance ratio of 105.53 ₹/MPa compared to 123.60 ₹/MPa for conventional concrete, representing 14.6% improved efficiency. The study establishes an optimized SCC formulation that combines high mechanical performance, quantified environmental benefits, and economic viability for sustainable construction applications.</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

Performance evaluation of fiber-optimized self-compacting concrete: mechanical, microstructural, and life cycle perspectives

  • 期刊论文

  • 发表日期：

    2026年5月4日

查看全文
  • Ramamohana Reddy Bellum,
  • Talapa Reddy Suman Kumar,
  • Chava Venkatesh

摘要

The construction industry requires sustainable high-performance materials, as cement production contributes approximately 8% of global CO₂ emissions. This study presents a fiber-optimized high-strength self-compacting concrete (SCC) incorporating fly ash and silica fume as partial cement replacements, focusing on rheological behavior, mechanical performance, microstructural evolution, and life-cycle sustainability. A total of 40% cement replacement was achieved using 160 kg/m³ fly ash and 40 kg/m³ silica fume, while polypropylene fibers were incorporated at 0.02%, 0.04%, 0.06%, and 0.08% by volume to identify the optimum fiber dosage that balances flowability and strength. Fresh properties were evaluated using slump flow, L-box, and V-funnel tests, while mechanical properties were assessed through compressive, split tensile, and flexural strength tests at 7, 14, and 28 days. Microstructural characteristics were examined using XRD, FTIR, TGA/DTA, and SEM–EDS analyses. The results demonstrate that an optimal fiber dosage of 0.06% yields superior performance, achieving compressive, split tensile, and flexural strengths of 74.85 MPa, 6.46 MPa, and 5.79 MPa, respectively, representing improvements of 8.3%, 11.0%, and 6.8% over the control mix. Microstructural analysis confirms enhanced C–S–H formation, pore refinement, and effective fiber bridging. Life-cycle assessment quantified environmental performance across six impact categories, revealing that the integration of 40% supplementary cementitious materials reduced global warming potential by 34.6% (from 791.83 to 517.86 kg CO₂-eq/m³) and primary energy demand by 31.3% (from 8643.38 to 5938 MJ/m³) relative to conventional concrete. Fiber-reinforced variants exhibited minimal environmental variation across all categories—global warming potential ranged 517.07–517.86 kg CO₂-eq/m³, acidification potential 4.580–4.589 kg SO₂-eq, and eutrophication potential 0.744–0.754 kg PO₄³⁻-eq. Economic evaluation demonstrates that the optimal mix achieved production costs of ₹7366.08/m³ with superior cost-performance ratio of 105.53 ₹/MPa compared to 123.60 ₹/MPa for conventional concrete, representing 14.6% improved efficiency. The study establishes an optimized SCC formulation that combines high mechanical performance, quantified environmental benefits, and economic viability for sustainable construction applications.