article · Journal of Materials Research and Technology
Ultra-high performance geopolymer concrete was tested under elevated temperatures reaching 800 degrees Celsius to evaluate the impact of replacing fine aggregate with waste glass and waste ceramic at volumes between 7.5% and 22.5%. Experimental results showed that concrete containing waste glass maintained higher residual compressive strength across all temperatures, retaining up to 98% at 300 degrees Celsius, 63% at 600 degrees Celsius, and 32% at 800 degrees Celsius. In contrast, waste ceramic mixtures retained 86%, 51%, and 24% at the same respective temperatures. Microscopic examination confirmed that pore structures in ceramic samples widened significantly above 600 degrees Celsius, whereas glass samples developed fewer pores. Furthermore, mixtures with 22.5% waste glass retained 95% of their initial weight, compared to an 8% mass loss in ceramic mixtures, confirming waste glass as an effective material for high-temperature stability.
Concrete structures exposed to extreme heat can suffer severe loss of strength and rapid deterioration. Showing that recycled waste glass can outperform waste ceramic to preserve concrete integrity up to 800 degrees Celsius supports the development of eco-friendly building components. This provides an effective way to repurpose waste materials while enhancing the fire and thermal resistance of high-performance building infrastructure.
This work is applicable to building material developers and precast concrete manufacturers seeking formulations for heat-resilient construction products. Because the findings are based on laboratory testing of specimen heating, mass loss, and residual compressive strength, the work represents applied, laboratory-stage research. Real-world commercial deployment would necessitate further scale-up, standard compliance testing, and full structural performance assessments under practical heating scenarios.
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This research evaluates the effect of high temperatures up to 800 °C on the compressive strength and microstructure of the developed ultra-high performance geopolymer concrete (UHPGC) containing waste glass (WG) and ceramic (WC). Fine aggregate was partially substituted with WG and WC in the range of 7.5–22.5% by vol. Samples were heated in the range of 200–800 °C at a heating rate of 5 °C/min for 1.5 h. The visual appearance, mass loss, residual compressive strength, and microscopic investigation of UHPGC mixtures were investigated. The outcomes of the experiments demonstrated that the residual strength of UHPGC containing WG varied from 98% to 97%, 59%–63%, and 27%–32% after being subjected to 300, 600, and 800 °C, respectively. While WC samples had residual strengths varying from 86% to 83%, 51%–45%, and 24%–18%, respectively. Therefore, compressive strength deteriorates more slowly with an increase in WG than WC. Microscopy experiments showed that WC pore structure expanded with temperature, notably above 600 °C, while WG had less pore structure and enhanced residual strength. Finally, the incorporation of WG is more effective in UHPGC thermal stability up to 800 °C than WC. Thermogravimetric analysis (TGA) results revealed that the mixtures containing 22.5% WG maintained about 95% of its weight, while the mixtures incorporating 22.5% WC lost 8% of their weight. It is concluded that WG could be implemented as an eco-friendly material with desirable properties at high temperatures.
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DOI: 10.1016/j.jmrt.2023.02.177
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