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Journals / Gazi University Journal of Science / 2025 / Volume: 38 Issue: 4

Alkali-Activated Mortars Incorporating Construction and Demolition Waste and Industrial By-products: A Fresh and Hardened State Evaluation

Selahattin Güzelküçük(ANKARA UNIVERSITY)0000-0003-2115-5821
Oğuzhan Şahin(ANKARA UNIVERSITY)0000-0003-2104-5761
Şevki Eren(KIRSEHIR AHI EVRAN UNIVERSITY)0000-0003-0773-4034
Hüseyin Ulugöl(ANKARA UNIVERSITY)0000-0002-0186-3145
Pages
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Publication Date
2025-12-01
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The findings indicate that mixtures with class C fly ash achieved higher compressive strength, whereas F class fly ash positively affected workability and high-temperature resistance.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:This study examines the potential of alkali-activated composites to produce sustainable building materials by recycling construction and demolition waste (CDW).
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Key Findings & Data:In particular, the B3 mixture (20% class F fly ash, 40% slag) exhibited a balanced set of properties in terms of workability, compressive strength, and high-temperature performance.
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Conclusion & Impact:The findings indicate that mixtures with class C fly ash achieved higher compressive strength, whereas F class fly ash positively affected workability and high-temperature resistance.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Alkali-activated composites · Ground granulated blast furnace slag · Fly ash

Abstract

This study examines the potential of alkali-activated composites to produce sustainable building materials by recycling construction and demolition waste (CDW). Various waste materials such as ground granulated blast furnace slag (GGBS), class F and C fly ash (FA), recycled waste clay brick powder (RWBP), and waste concrete powder (WCP) were used to produce different alkali-activated composites along with recycled concrete aggregate. The prepared mixtures were analyzed for their fresh-state properties, as well as their physical and mechanical characteristics, including workability, strength, ultrasonic pulse velocity (UPV), and resistance to high temperatures. The findings indicate that mixtures with class C fly ash achieved higher compressive strength, whereas F class fly ash positively affected workability and high-temperature resistance. Slag effectively enhanced the compressive strength of the alkali-activated composites. In particular, the B3 mixture (20% class F fly ash, 40% slag) exhibited a balanced set of properties in terms of workability, compressive strength, and high-temperature performance. This study provides a valuable resource for producing alkali-activated composites from CDW and industrial waste, with the potential to reduce the environmental impact of the construction sector.

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Cite This Article

Güzelküçük, S., Şahin, O., Eren, Ş., Ulugöl, H. (2025). Alkali-Activated Mortars Incorporating Construction and Demolition Waste and Industrial By-products: A Fresh and Hardened State Evaluation. Gazi University Journal of Science, Volume: 38 Issue: 4. https://doi.org/10.35378/gujs.1637907

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