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Enhancing thermal insulation, mechanical strength, and durability of one-part fly ash-based geopolymer foam concrete using lime and mahogany sawdust     
Yazarlar (8)
Arş. Gör. İhsan TÜRKEL Arş. Gör. İhsan TÜRKEL
Kastamonu Üniversitesi, Türkiye
Arş. Gör. Dr. İffet Gamze MÜTEVELLİ ÖZKAN Arş. Gör. Dr. İffet Gamze MÜTEVELLİ ÖZKAN
Kastamonu Üniversitesi, Türkiye
Esmanur Baltaoglu
Ahmet Benli
Doç. Dr. Oğuzhan Yavuz BAYRAKTAR Doç. Dr. Oğuzhan Yavuz BAYRAKTAR
Kastamonu Üniversitesi, Türkiye
Halil Baris Ozel
Prof. Dr. Hakan ŞEVİK Prof. Dr. Hakan ŞEVİK
Kastamonu Üniversitesi, Türkiye
Gokhan Kaplan
Devamını Göster
Özet
The development of sustainable and energy-efficient construction materials is crucial for reducing environmental impact and improving building performance. This study investigates the effects of slaked lime (LM) and mahogany sawdust (MS) as partial replacements for fly ash (FA) and silica sand (SS) in one-part geopolymer foam concrete (GFC). Twelve mixtures were tested for fresh properties (flowability, density), mechanical performance (compressive and flexural strength), thermal insulation (thermal conductivity), and durability (water absorption, porosity, sorptivity, high-temperature resistance, freeze–thaw, and sulfate resistance). The results revealed that increasing LM content enhanced compressive strength, with the highest strength of 6.22 MPa achieved at 50 % LM and 100 % MS, representing a 202.92 % improvement compared to the reference mixture (2.06 MPa). Although the maximum compressive strength (6.22 MPa) is lower than conventional concrete, the developed GFCs are intended for non-structural, lightweight, and thermally insulating applications, where low density and high thermal performance are prioritized over structural load-bearing capacity. Flexural strength followed a similar trend, reaching 0.39 MPa, marking a 129.41 % increase over the reference. The incorporation of MS contributed to weight reduction, with the lowest oven-dry density recorded at 556 kg/m³ for the reference mixture, while the highest density was 1587 kg/m³ at 100 % MS and 50 % LM, showing a 185.32 % increase. Thermal conductivity values ranged from 0.113 W/mK (reference) to 0.197 W/mK (100 % MS, 50 % LM), indicating improved insulation properties at lower LM content. This corresponds to a 74.34 % increase in thermal conductivity, highlighting the densification effect of LM and MS incorporation. Water absorption and sorptivity decreased significantly with higher LM levels, with sorptivity dropping from 32.52 kg/m² (reference) to 10.87 kg/m² (100 % MS, 50 % LM). High-temperature resistance tests revealed that strength increased by up to 33.6 % at 200°C but declined significantly at 800°C, with the highest loss (46 %) occurring in high-MS-content mixtures. Freeze-thaw resistance was optimal at 0 % MS, where strength increased after 25 cycles, but higher MS content led to up to 57.6 % strength loss after 50 cycles. These findings demonstrate that an optimized LM-MS balance enhances mechanical, thermal, and durability performance, making geopolymer foam concrete a viable alternative for sustainable construction.
Anahtar Kelimeler
Durability | Geopolymer foam concrete | Lime | Mahogany sawdust | Mechanical properties | Sustainability | Thermal insulation
Makale Türü Özgün Makale
Makale Alt Türü SSCI, AHCI, SCI, SCI-Exp dergilerinde yayımlanan tam makale
Dergi Adı Construction and Building Materials
Dergi ISSN 0950-0618 Wos Dergi Scopus Dergi
Dergi Grubu Q1
Makale Dili İngilizce
Basım Tarihi 09-2025
Cilt No 491
Sayı 1
Doi Numarası 10.1016/j.conbuildmat.2025.142656