Influence of wetting-drying curing system on the performance of fiber reinforced metakaolin-based geopolymer composites

Arslan, Ahmet; Uysal, Mücteba; Yilmaz, Arın; Al-mashhadani, Mukhallad M.; Canpolat, Orhan; Şahin, Furkan; Aygörmez, Yurdakul

doi:10.1016/j.conbuildmat.2019.07.235

Cited by 84 publications

(21 citation statements)

References 52 publications

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“…Also, PVA fibers prevented the sample from exploding by creating extra paths to allow evaporated moisture to escape without causing high internal pressure (Sahmaran et al, 2010). This study is compatible with previous studies where PVA fibers increased strength more than basalt fibers (Arslan et al, 2019;Celik et al, 2018). The fibers showed similar behavior in flexural strength.…”

Section: Strength Resultssupporting

confidence: 92%

“…The geopolymer mechanism ensured the continuity of the polymerization reactions due to the strong aluminosilicate bonds but, as the time elapsed by the high-temperature effect increased, the degradation increased and depolymerization occurred in the aluminosilicate polymers . As was seen in previous studies, a geopolymer had much better high-temperature resistance than conventional concrete (Arslan et al, 2019;Celik et al, 2018). The FT-IR spectrums of sample MZS+0.9PVA before and after 750 o C are shown in Figure 9.…”

Section: Visual Inspection and Analysessupporting

confidence: 68%

“…Despite these situations, it was observed that the classical geopolymer microstructure was preserved and the homogeneous matrix in the gel was resistant to high-temperature effects following the results found by visual inspection. These situations proved that geopolymer samples were a sustainable, durable product (Arslan et al, 2019;Celik et al, 2018). The XRD spectrums of sample MZS+0.9PVA before and after 750 o C are shown in Figure 8.…”

Section: Visual Inspection and Analysesmentioning

confidence: 84%

“…The increase in crack propagation above 500°C and the start of the melting of the fibers extended the propagation process of ultrasonic velocity waves, resulting in lower values. However, the high modulus of elasticity of PVA and basalt fibers limited this situation (Arslan et al, 2019;Celik et al, 2018).…”

Section: Upv and Weight Loss Resultsmentioning

confidence: 99%

“…However, despite the high-temperature effect, it was observed that the cracks that formed were limited and the samples remained stable. It was proved that geopolymer samples did not show dispersion, depending on the curing condition applied after hightemperature effects (Arslan et al, 2019;Aygörmez, Canpolat, Al-mashhadani, et al, 2020;Celik et al, 2018). The binding degree of the geopolymer matrix was investigated by SEM analyzes before and after 750 o C in sample MZS+0.9PVA (Figure 7).…”

Section: Visual Inspection and Analysesmentioning

confidence: 99%

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Performance of ambient and freezing-thawing cured metazeolite and slag based geopolymer composites against elevated temperatures

Aygörmez

2021

rdlc

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Today, geopolymer has an important place in producing sustainable alternative products by consuming less energy. This paper researches the elevated-temperature behavior of metazeolite (MZ) and slag (S) based geopolymer composites, reinforced by polyvinyl alcohol fiber (PVA) (at 0.3%, 0.6% and 0.9% by volume), and basalt fiber (B) (at 0.3%, 0.6% and 0.9% by volume). The curing was carried out at room temperature for up to 7 days and then the freeze-thaw test was applied as a curing method for up to 28 days. Slag was used alongside metazeolite to solve the problem of delayed setting time with its high Ca content. After 7 days, the damp environment provided by the freeze-thaw curing ensured the preservation of the compact structure and the continuation of geopolymerization. The resulting geopolymer composites were exposed to temperatures of 250, 500, and 750 oC. The flexural and compressive strengths, microstructure (FT-IR, XRD, SEM, TGA-DTA, and micro-CT analyzes), ultrasonic pulse velocity (UPV), visual inspection, and weight-losses of the geopolymers were examined to evaluate their behavior. According to the results, it was observed that geopolymer samples maintained their stability after 750oC. In this way, a sustainable geopolymer composite was produced by using less energy.

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Section: Strength Resultssupporting

confidence: 92%

Section: Visual Inspection and Analysessupporting

confidence: 68%

Section: Visual Inspection and Analysesmentioning

confidence: 84%

Section: Upv and Weight Loss Resultsmentioning

confidence: 99%

Section: Visual Inspection and Analysesmentioning

confidence: 99%

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Performance of ambient and freezing-thawing cured metazeolite and slag based geopolymer composites against elevated temperatures

Aygörmez

2021

rdlc

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Use of metakaolins from Eseka and Dibamba‐Cameroon as an optimization additive of CEM I Portland cement mortar

Tchamba,

Esunsen,

Kanouo

et al. 2024

Int J Ceramic Engine & Sci

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The present study deals with two kaolins from Eseka and Dibamba‐Cameroon to determine their potential suitability as additive of CEM I 42.5R and to optimize the properties of cement in the sense to promote low‐carbon cement. X‐ray diffractometry was used to establish the mineralogical composition of two kaolins. X‐ray fluorescence was carried out to determine the chemical composition of kaolins and cement. Fine metakaolin powders obtained at 700°C were used as additive in CEM I 42.5R. Furthermore, consistency, setting time, water absorption, compressive and flexural test, and shrinkage test were evaluated. Scanning electron microscopy analysis was carried out to evaluate the microstructure variation. The substitution of CEM I with metakaolin resulted in a considerable increase in compressive and flexural strength from days 7 to 28 at optimum value. The compressive and flexural strengths at 28 days at optimum value of metakaolin increase to 52% and 44%, respectively, explaining the equilibrium oxides in the cement. The maximum values of strength with 20 wt.% MK1 and 30 wt.% MK2 at 7, 14, and 28 days appear in both cases when the ratio of SiO2/Al2O3 is between 2.8 and 2.9. The silica modulus and alumina modulus of cement–metakaolin improved when metakaolin was added. The properties of cement were optimized with a 52% increase in compressive strength at 28 days.

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Novel binder material in geopolymer mortar production: Obsidian stone powder

Kurt

Ustabaş

Cakmak

2023

Structural Concrete

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This paper presents the results of mechanical and micro‐structural properties of geopolymer mortars with obsidian, ground granulated blast furnace slag, and metakaolin. In this study, 13 different combinations were created using 25% by weight of obsidian, blast furnace slag, and metakaolin. Geopolymer mortars were poured at 0.45 water/binder ratio, 12M NaOH concentration, and exposed to thermal cure at 75°C, 90°C, 105°C, and 120°C for 72 h. The flexural and compressive strengths of the mortars were measured and their microstructural properties were analyzed. As a result of the study, the maximum compressive strength was obtained as 93.7 MPa, and the maximum flexural strength was 21.4 MPa. From the results obtained when different combinations are used, it has been observed that the materials work in harmony with each other and the optimum curing temperature is 90°C. Also, scanning electron microscopy (SEM) and EDS analyses indicated that the compact structure of the geopolymer matrix and the Ca/Si ratio are directly proportional to the mechanical strength of the sample. The high wavelength value formed in the main band as a result of Fourier‐transformed infrared spectroscopy (FTIR) analysis shows that the mortars have high mechanical properties.

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Influence of wetting-drying curing system on the performance of fiber reinforced metakaolin-based geopolymer composites

Cited by 84 publications

References 52 publications

Performance of ambient and freezing-thawing cured metazeolite and slag based geopolymer composites against elevated temperatures

Performance of ambient and freezing-thawing cured metazeolite and slag based geopolymer composites against elevated temperatures

Use of metakaolins from Eseka and Dibamba‐Cameroon as an optimization additive of CEM I Portland cement mortar

Novel binder material in geopolymer mortar production: Obsidian stone powder

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