Scholarlink

<p>This study investigates the use of waste coral sand powder (CSP) combined with metakaolin (MK) to develop an eco-friendly ternary binder, coral sand calcined clay cement (CSC<sup>3</sup>), for marine infrastructure. The binder replaced 45% of cement with CSP and MK and varied in gypsum content. Comprehensive testing involved compressive strength, isothermal calorimetry, X-ray diffraction (XRD), thermogravimetric analysis (TG), mercury intrusion porosimetry (MIP), and life cycle assessment (LCA). CSC<sup>3</sup> exhibited performance comparable to limestone calcined clay cement (LC<sup>3</sup>), achieving a 28-day compressive strength of 50.21&#xa0;MPa, approximately 30% higher than Portland cement (PC). Adding 2% gypsum increased early strength by 21.36%, though a slight decrease of 5.12% was observed at 28&#xa0;days. CSP and MK together enhanced hydration and promoted carboaluminate formation. MK reacted with CSP to form carboaluminate and with portlandite to produce C-(A)-S–H gels via pozzolanic reaction. Microstructural analysis confirmed pore refinement, with the most probable pore diameter decreasing to 0.013&#xa0;μm and large capillary pores reduced to 8.66% at 28&#xa0;days. CSC<sup>3</sup> reduced global warming potential (GWP) by approximately 40% compared to PC. This binder offers a promising pathway for reducing the carbon footprint of the cement industry while promoting the utilization of waste coral.</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

Eco-friendly ternary binder from waste coral sand and metakaolin: hydration behavior and environmental impact assessment

  • 期刊论文

  • 发表日期：

    2026年4月29日

查看全文
  • Xiaoyu Bai,
  • Jian Ma,
  • Jinfeng Sun,
  • Zhuqing Yu,
  • Jun Song

摘要

This study investigates the use of waste coral sand powder (CSP) combined with metakaolin (MK) to develop an eco-friendly ternary binder, coral sand calcined clay cement (CSC3), for marine infrastructure. The binder replaced 45% of cement with CSP and MK and varied in gypsum content. Comprehensive testing involved compressive strength, isothermal calorimetry, X-ray diffraction (XRD), thermogravimetric analysis (TG), mercury intrusion porosimetry (MIP), and life cycle assessment (LCA). CSC3 exhibited performance comparable to limestone calcined clay cement (LC3), achieving a 28-day compressive strength of 50.21 MPa, approximately 30% higher than Portland cement (PC). Adding 2% gypsum increased early strength by 21.36%, though a slight decrease of 5.12% was observed at 28 days. CSP and MK together enhanced hydration and promoted carboaluminate formation. MK reacted with CSP to form carboaluminate and with portlandite to produce C-(A)-S–H gels via pozzolanic reaction. Microstructural analysis confirmed pore refinement, with the most probable pore diameter decreasing to 0.013 μm and large capillary pores reduced to 8.66% at 28 days. CSC3 reduced global warming potential (GWP) by approximately 40% compared to PC. This binder offers a promising pathway for reducing the carbon footprint of the cement industry while promoting the utilization of waste coral.