Properties of fly ash-based lightweight-geopolymer mortars containing perlite aggregates: Mechanical, microstructure, and thermal conductivity coefficient

Karakaş, Hamza; İlkentapar, Serhan; Durak, Uğur; Örklemez, Ezgi; ÖZUZUN, Sümeyye; Karahan, Okan; Atiş, Cengiz Duran

doi:10.1016/j.conbuildmat.2022.129717

Cited by 40 publications

(7 citation statements)

References 42 publications

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“…The augmented porosity within mixtures containing GGR emerges as a key contributor to the observed improvements in thermal insulation, a mechanism that aligns with the findings of Karakaş et al. (2023), who emphasized the connection between porosity and thermal resistance. Specifically, as demonstrated by the thermal conductivity values of mixtures MG2, MG3, MG4, and MG5, registering reductions of 12.97%, 24.06%, 36.15%, and 42.82% respectively compared to the baseline MG1, the significant impact of increased GGR content on thermal conductivity reduction becomes evident.…”

Section: Resultssupporting

confidence: 85%

Eco‐friendly geopolymer mortar prepared from geopolymer waste: Mechanical and thermal properties

Bourzik,

Baba,

Akkouri

2023

Environmental Quality Mgmt

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As the demand for sustainable construction practices increases, alternative materials are being explored to reduce waste and carbon emissions. This study investigates the feasibility of utilizing recycled geopolymer binder as a substitute for ordinary sand in the production of geopolymer mortar. The study examines the effects of various replacement rates of recycled geopolymer on the physical, mechanical, and thermal properties of the geopolymer mortar. The results indicate that geopolymer mortar incorporating recycled geopolymer binder as a replacement for ordinary sand exhibits similar mechanical properties to traditional geopolymer mortar, with minor decreases in compressive and flexural strength as the replacement rate increased. The geopolymer mortar also demonstrated lower thermal conductivity than traditional mixes, resulting in increased thermal insulation. These findings suggest that using recycled geopolymer binder as a replacement for ordinary sand in geopolymer mortar production could be a promising approach for sustainable construction practices.

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Section: Resultssupporting

confidence: 85%

Eco‐friendly geopolymer mortar prepared from geopolymer waste: Mechanical and thermal properties

Bourzik,

Baba,

Akkouri

2023

Environmental Quality Mgmt

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“…In Figure 15, the TCs of the LWC produced in this study are presented alongside those reported in other studies involving LWC made of OPC and geopolymer binders, employing different types of aggregates. These aggregates include PA, 8,10,11,28,35–38 expanded perlite, 29,39–41 expanded polystyrene, 11,42,43 diatomite, 37,44 vermiculite, 43,45 foaming agent, 46–48 oil palm shell, 27 expanded clay, 36,49 expanded shale, 36 sawdust, 50 hemp shiv, 51 cenosphere, 52 ethyl vinyl acetate, 53 clay brick, 28 expanded glass, 29 ceramic microspheres, 29 plastic bead, 25 and bottom ash 54 …”

Section: Discussionmentioning

confidence: 99%

Thermal and mechanical performance of lightweight geopolymer concrete with pumice aggregate

Jamal,

Bzeni,

Shi

2023

Structural Concrete

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This study aims to prepare and assess the mechanical characteristics of fly ash (FA)‐based lightweight geopolymer concrete (LWGPC) utilizing pumice as a coarse aggregate. A comprehensive set of 16 LWGPC mixtures were synthesized. The first twelve mixtures produced with varying alkaline to FA ratio and varying proportions of coarse aggregates. The mixture proportion that has given the highest compressive strength (CS), was selected to create four other LWGPC mixes with water‐to‐solid ratios (w/s) ranging from 0.17 to 0.23. Fresh and mechanical properties as well as thermal conductivity (TC) of the LWGPC samples were examined. The experimental findings indicate an inverse relationship between the w/s ratio and mechanical properties of LWGPC samples. Notably, the mechanical properties attain their highest values at the lowest w/s ratio, primarily attributed to reduced porosity and higher concentration of alkali solution in the mixtures with lesser water content. The LWGPC achieved highest CS of 13 MPa, modulus of elasticity (ME) of 8.8 GPa, flexural strength (FS) of 2.2 MPa, and tensile splitting strength (TSS) of 1.64 MPa. The oven dry density (ODD) and TC values ranged from 1746 to 1815 kg/m3 and 0.119 to 0.131 W/m K, respectively. A low‐cost and eco‐friendly novel lightweight concrete composition with low TC was developed.

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“…Especially in construction, it was more widely used. When expanded perlite was used as an aggregate in construction materials (e.g., concrete and mortar) it can reduced the thermal conductivity, increased the durability of concrete, improved its resistance to chemical attack, and the strength of concrete can be effectively adjusted according to the amount of perlite used [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties, thermal properties and durability of lightweight thermal insulation recycled concrete

Xu,

Pan,

et al. 2024

Preprint

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To improve forestry solid waste reuse, reduce building energy consumption, and increase building capacity, preparing lightweight concrete with new materials has gained recent attention. This paper used waste wood and expanded perlite (EP) to design lightweight thermal insulation recycled concrete (LTIRC) with different volume admixtures. Compared to mineral aggregate, wood aggregate (WA) and EP show large differences in water absorption, particle morphology, density, and crushing index. Therefore, this paper comprehensively evaluated the dry density, mechanical properties, thermal properties, chloride ion permeability, and frost resistance of LTIRC. The results showed WA and EP introduction effectively reduced concrete bulk weight and met the dry density standard for lightweight concrete. Regarding thermal insulation performance, both WA and EP are characterized by porous, low–density, and low thermal conductivity. Consequently, LTIRC thermal conductivity was reduced by up to 76.5% versus conventional concrete, effectively increasing resistance to heat flow through concrete and providing potential for building energy savings. Additionally, WA and EP addition caused LTIRC to experience mechanical and durability property deterioration. However, some LTIRCs achieved over 80% of the strength of natural aggregate concrete. Moreover, WA addition inhibited internal crack generation in LTIRC and slowed concrete damage from increased WA and EP dosage. The maximum mass loss of LTIPC was 2.72% after 100 freeze–thaw cycles. LTIPC precast panels are suitable for preparing low–carbon insulated building wall panels.

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Properties of fly ash-based lightweight-geopolymer mortars containing perlite aggregates: Mechanical, microstructure, and thermal conductivity coefficient

Cited by 40 publications

References 42 publications

Eco‐friendly geopolymer mortar prepared from geopolymer waste: Mechanical and thermal properties

Eco‐friendly geopolymer mortar prepared from geopolymer waste: Mechanical and thermal properties

Thermal and mechanical performance of lightweight geopolymer concrete with pumice aggregate

Mechanical properties, thermal properties and durability of lightweight thermal insulation recycled concrete

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