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Journals / Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım ve Teknoloji / 2026 / Cilt: 14 Sayı: 3

Effect of Bentonite Replacement and Polypropylene Fiber Reinforcement on Physico-Mechanical and Durability Performance of One-Part Slag-Based Geopolymer Foam Concretes

Bentonit İkamesi ve Polipropilen Lif Takviyesinin Tek Bileşenli Cüruf Esaslı Geopolimer Köpük Betonların Fiziko-Mekanik ve Dayanıklılık Performansı Üzerindeki Etkisi

Oğuzhan Yavuz Bayraktar(KASTAMONU ÜNİVERSİTESİ)0000-0003-0578-6965
Gökhan Kaplan(ATATÜRK ÜNİVERSİTESİ)0000-0001-6067-7337
Pages
1258–1279
Publication Date
2026-09-30
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AI Summary & Key Takeaways

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

Ultimately, the findings emphasize that controlling rheology is key to balancing insulation and strength in GFC development.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:This study examines the physical, mechanical, and durability characteristics of a one-part slag based geopolymer foam concrete (GFC) that incorporates bentonite (0-20%) and polypropylene fibers (PPF, 0-1%).
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Key Findings & Data:Bentonite's high water absorption and the physical network formed by PPF together increased the paste's yield stress beyond a critical level, leading to foam bubble breakdown during mixing.
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Conclusion & Impact:Ultimately, the findings emphasize that controlling rheology is key to balancing insulation and strength in GFC development.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:Bentonit · Polipropilen lif · Donma-çözülme etkisi

Abstract

This study examines the physical, mechanical, and durability characteristics of a one-part slag based geopolymer foam concrete (GFC) that incorporates bentonite (0-20%) and polypropylene fibers (PPF, 0-1%). While the main goal was to achieve a low-density material with good mechanical durability, the combination of bentonite and PPF unexpectedly caused a 'foam collapse' issue. Bentonite's high water absorption and the physical network formed by PPF together increased the paste's yield stress beyond a critical level, leading to foam bubble breakdown during mixing. As a result, the mixes divided into two distinct groups: (1) Stable GFCs (e.g., 0BP5) with low density (641 kg/m³), high porosity (61.2%), and excellent thermal insulation (0.172 W/mK), but low compressive strength (2.32 MPa); and (2) Densified mortars (e.g., 20BP5) with higher density (1779 kg/m³), greater strength (20.56 MPa), and better freeze thaw resistance (1.84% mass loss), though they lost insulating properties (0.543 W/m.K). Additionally, high-temperature tests showed that bentonite improved thermal stability significantly at 750°C. Ultimately, the findings emphasize that controlling rheology is key to balancing insulation and strength in GFC development.

Özet

Bu çalışma, bentonit (0-20%) ve polipropilen elyaf (PPF, 0-1%) içeren tek bileşenli cüruf esaslı geopolimer köpük betonun (GFC) fiziksel, mekanik ve dayanıklılık özelliklerini incelemektedir. Ana hedef, iyi mekanik dayanıklılığa sahip düşük yoğunluklu bir malzeme elde edilmesiydi, ancak bentonit ve PPF'nin birleşimi beklenmedik bir şekilde “köpük çökmesi” sorununa neden olmuştur. Bentonitin yüksek su emilimi ve PPF'lerin oluşturduğu fiziksel ağ, hamurun akma gerilmesini kritik bir seviyenin üzerine çıkarmış ve karıştırma sırasında köpük kabarcıklarının bozulmasına neden olmuştur. Sonuç olarak, karışımlar iki ayrı gruba ayrılmıştır: (1) Düşük yoğunluklu (641 kg/m³), yüksek gözeneklilikli (61,2%) ve mükemmel ısı yalıtımına (0,172 W/mK) sahip, ancak düşük basınç dayanımına (2,32 MPa) sahip kararlı GFC'ler (ör. 0BP5); ve (2) Daha yüksek yoğunluklu (1779 kg/m³), daha yüksek dayanımlı (20,56 MPa) ve daha iyi donma-çözülme direncine (kütle kaybı %1,84) sahip yoğunlaştırılmış harçlar (ör. 20BP5), ancak yalıtım özelliklerini kaybetmişlerdir (0,543 W/mK). Ek olarak, yüksek sıcaklık testleri bentonitin 750 °C'de termal stabiliteyi önemli ölçüde iyileştirdiğini göstermiştir. Sonuç olarak, bulgular reolojinin kontrol edilmesinin GFC geliştirmede yalıtım ve mukavemet dengesini sağlamada anahtar rol oynadığını vurgulamaktadır.

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Cite This Article

Bayraktar, O. Y., Kaplan, G. (2026). Effect of Bentonite Replacement and Polypropylene Fiber Reinforcement on Physico-Mechanical and Durability Performance of One-Part Slag-Based Geopolymer Foam Concretes. Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım ve Teknoloji, Cilt: 14 Sayı: 3, 1258–1279. https://doi.org/10.29109/gujsc.1855241

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