Scholarlink

<p>The construction industry’s dependence on Portland cement greatly contributes to global CO₂ emissions, highlighting the need for low-carbon alternatives. This research partially replaces cement with materials such as recycled concrete fines (WC), ground glass (GG), sugarcane bagasse ash (SCBA), and coffee husk biochar (CHB) produced via microwave-assisted pyrolysis (MAP). Comprehensive physicochemical, mechanical, microstructural, and thermal analyses and life cycle and techno-economic assessments were carried out in this research. SCBA and GG increased compressive strength by up to 64% and 46%, respectively, compared with the control specimen at 7 days, while CHB enhanced internal curing due to its high porosity. Life-cycle analysis revealed CHB concretes emitted as little as 0.005–59&#xa0;kg CO₂/m³, significantly lower than conventional mixes. Techno-economic analysis highlighted GG as the most cost-effective alternative, while MAP-enabled CHB demonstrated commercial viability. The results substantiate a circular economy model by integrating waste feedstocks in concrete production and a scalable pathway to decarbonise concrete through sustainable waste utilisation.</p> Graphical Abstract <p></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

Waste-Derived Alternatives for Sustainable Cement Replacement in Concrete

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月28日

查看全文
  • Scarlett Allende,
  • Muhammad Adeel Zafar,
  • Rajeev Roychand,
  • Tuan Ngo,
  • Mohan V. Jacob

摘要

The construction industry’s dependence on Portland cement greatly contributes to global CO₂ emissions, highlighting the need for low-carbon alternatives. This research partially replaces cement with materials such as recycled concrete fines (WC), ground glass (GG), sugarcane bagasse ash (SCBA), and coffee husk biochar (CHB) produced via microwave-assisted pyrolysis (MAP). Comprehensive physicochemical, mechanical, microstructural, and thermal analyses and life cycle and techno-economic assessments were carried out in this research. SCBA and GG increased compressive strength by up to 64% and 46%, respectively, compared with the control specimen at 7 days, while CHB enhanced internal curing due to its high porosity. Life-cycle analysis revealed CHB concretes emitted as little as 0.005–59 kg CO₂/m³, significantly lower than conventional mixes. Techno-economic analysis highlighted GG as the most cost-effective alternative, while MAP-enabled CHB demonstrated commercial viability. The results substantiate a circular economy model by integrating waste feedstocks in concrete production and a scalable pathway to decarbonise concrete through sustainable waste utilisation.

Graphical Abstract