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<p>The construction industry faces urgent environmental challenges owing to the carbon-intensive production of ordinary Portland cement and the depletion of natural aggregates. In this study, geopolymer concrete incorporating over-burnt brick aggregates was used as a partial substitute for natural coarse aggregates to enhance sustainability while maintaining performance. The role of binder composition was examined by varying the ground granulated blast furnace slag (GGBFS) and fly ash (FA) in ratios of 100:0, 75:25, 50:50, and 25:75. The mechanical properties and durability were investigated under ambient curing at replacement levels of 0–50%. The tests included slump flow, compressive, tensile, flexural strength, water absorption, porosity, and ultrasonic pulse velocity. The results showed that slag-rich binders achieved the highest 28-day compressive strength (66.1&#xa0;MPa) and the lowest water absorption (2.0–3.5%), whereas FA-dominant mixtures improved workability (slump up to 130&#xa0;mm) but exhibited reduced strength and higher porosity (up to 15.2%). The use of over-burnt brick aggregates lowered the strength owing to their porous structure, but a balanced 50:50 binder ratio with 30% replacement provided an optimal trade-off between strength, durability, and sustainability. These findings demonstrate that recycled aggregates can be effectively incorporated into geopolymer systems, offering a practical pathway for low-carbon construction. Future work should focus on improving the long-term durability and assessing the feasibility of industrial-scale applications.</p>

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Performance of geopolymer concrete with over-burnt brick aggregates influence of binder composition and sustainability

  • 期刊论文

  • 发表日期：

    2025年10月4日

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  • Nannuta Satya Shiva Prasad,
  • Mudimby Andal

摘要

The construction industry faces urgent environmental challenges owing to the carbon-intensive production of ordinary Portland cement and the depletion of natural aggregates. In this study, geopolymer concrete incorporating over-burnt brick aggregates was used as a partial substitute for natural coarse aggregates to enhance sustainability while maintaining performance. The role of binder composition was examined by varying the ground granulated blast furnace slag (GGBFS) and fly ash (FA) in ratios of 100:0, 75:25, 50:50, and 25:75. The mechanical properties and durability were investigated under ambient curing at replacement levels of 0–50%. The tests included slump flow, compressive, tensile, flexural strength, water absorption, porosity, and ultrasonic pulse velocity. The results showed that slag-rich binders achieved the highest 28-day compressive strength (66.1 MPa) and the lowest water absorption (2.0–3.5%), whereas FA-dominant mixtures improved workability (slump up to 130 mm) but exhibited reduced strength and higher porosity (up to 15.2%). The use of over-burnt brick aggregates lowered the strength owing to their porous structure, but a balanced 50:50 binder ratio with 30% replacement provided an optimal trade-off between strength, durability, and sustainability. These findings demonstrate that recycled aggregates can be effectively incorporated into geopolymer systems, offering a practical pathway for low-carbon construction. Future work should focus on improving the long-term durability and assessing the feasibility of industrial-scale applications.