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

Aygörmez, Yurdakul

doi:10.7764/rdlc.20.1.145

Cited by 9 publications

(3 citation statements)

References 50 publications

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“…However, slagbased geopolymer mortars had dTsadvantages such as early hardenTng, rapTd slump loss, and workabTlTty. AlternatTve bTnders should be TnvestTgated Tn thTs sTtuatTon [14][15][16][17][18]. Bottom ash was used for thTs purpose.…”

Section: Strength Resultsmentioning

confidence: 99%

Sulfate and chloride resistance of bottom ASH doped slag-based geopolymer composites

AYGÖRMEZ¹

2022

Sigma J Eng Nat Sci - Sigma Müh Fen Bil Derg

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Within the scope of this study, while the performance of slag (S)-based geopolymer mortars with bottom ash (BA) reinforcement was examined, chloride and sulfate attack tests were also carried out to investigate their durability properties. For the durability tests of geopolymer composites, sodium chloride (NaCl) and sodium and magnesium sulfate (Na2SO4 and MgSO4) solutions were preferred for a period of 10 months and a 15% solution percentage. The performance of geopolymer composites after the effect of durability was determined by flexural and compressive strengths, SEM and XRD analyses, weight changes, and visual inspection. When the results obtained were evaluated, it was seen that 15% BA substitution provided the highest compressive strength. There was variation in durability tests. At the end of the 2-month period, there was an increase in the compressive strength, while a decrease was observed at the end of the 6-month period. The main factor that created these fluctuations was that alkali ions migrated from sample to solution while the solutions were diffusing into the matrix. Gypsum and ettringite formed in the pores were effective in the losses that occurred in the 6-month period. In addition, the alkali ions leaving the sample and passing into the solution effectively accelerated the formation of micro cracks. Thus, strength losses were observed.

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Section: Strength Resultsmentioning

confidence: 99%

Sulfate and chloride resistance of bottom ASH doped slag-based geopolymer composites

AYGÖRMEZ¹

2022

Sigma J Eng Nat Sci - Sigma Müh Fen Bil Derg

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“…These binders are activated with various alkalis. Alkaline activators such as sodium hydroxide (NaOH) (Atiş et al 2015;Aygörmez 2021), potassium hydroxide (KOH) (Okoye, Durgaprasad, and Singh 2015;Puligilla, Chen, and Mondal 2019), sodium silicate (Na2SiO3) (Yu et al 2017), potassium silicate (K2SiO3) (Chi et al 2019) are used in the activation process. These activators can be used alone or as a mixture of NaOH + Na2SiO3 and KOH+K2SiO3 (Hosan, Haque, and Shaikh 2016;Kaya et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Physical and mechanical properties of C class fly ash based lightweight geopolymer mortar produced with expanded vermiculite aggregate

Kaya

Köksal

2022

rdlc

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This study presents the physical and the mechanical properties of C class fly ash (FA) based lightweight geopolymer mortars produced with expanded vermiculite (EV) aggregate. The FA was activated with NaOH containing 12%, 14% and 16% sodium by weight. The volumetric ratios of EV/FA in the samples were chosen as 2,4 and 6 in the study. The liquid/solid ratio 0.23, 0.26 and 0.29. Lightweight geopolymer mortar (LGM) samples were produced by mixing FA, EV, NaOH and water in a mixer. The samples placed in molds were exposed to activation temperature of 100°C for 24 hours in the oven. The samples taken out of the oven were demoulded and kept in air curing for 28 days at 20°C±2°C room temperature. After curing, unit weight, apparent porosity, water absorption ratio, ultrasonic pulse velocity (UPV), flexural strength and compressive strength tests were performed on the samples. In addition, the thermal conductivity coefficients of the samples were determined. As a result of the experiment, a compressive strength varying between 0.59 MPa and 3.81 MPa was obtained in lightweight geopolymers samples with a unit weight between 906 kg/m3 and 1477 kg/m3. Expanded vermiculite showed a good performance on thermal conductivity of LGMs and a decrease in thermal conductivity up to the 0.094 W/mK was observed.

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“…Geopolymer concrete has positive properties such as high mechanical strength (Atiş et al, 2015;Kaya et al, 2020;Neupane, 2018), high abrasion resistance (Atabey et al, 2020;Atiş et al, 2015), high temperature resistance, low shrinkage (Çelikten, Sarıdemir, & Özgür Deneme 2019;, high freeze-thaw resistance (Atabey et al, 2020;Atiş et al, 2015;Aygörmez, 2021). However, it has insufficient properties such as low sulfate resistance (Aydın, 2010;Elyamany, Abd Elmoaty & Elshaboury, 2018).…”

Section: Introductionmentioning

confidence: 99%

Influences of high temperature on mechanical properties of fly ash based geopolymer mortars reinforced with PVA fiber

Kaya

Köksal

2021

rdlc

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In this study, a geopolymer composite containing PVA fiber was produced to recycle waste fly ash and obtain an eco-friendly binder. Mechanical properties of geopolymer mortars, produced by using F class fly ash which was activated with NaOH (sodium hydroxide), and reinforced by PVA (polyvinyl alcohol) fiber were investigated after high temperature effect. Geopolymer mortar samples produced by mixing with fly ash, sand, water and NaOH were placed in standard molds of 40×40×160 mm3. PVA fibers were used at percentages of 0,5%, 1% and 1,5% by volume in the experiment. Tests were performed on mortars exposed to high temperatures of 200°C, 400°C, 600°C and 800°C for physical and mechanical properties. For the specimens not subjected to high temperatures, an increase in the compressive strength of mortars containing PVA fibers was observed in comparison to mortar without PVA fiber. On the other hand, it was concluded that losses in compressive strength were less for mortar without PVA fiber when compared with the mortars containing PVA fibers. As a result of the modeling, the PVA ratio, which gives the optimum flexural and compressive strength, was determined as 1,47%. As a result of melting of PVA fibers under the effect of high temperature, 83,58% loss of compressive strength was determined in samples containing 1,5% PVA after 800ºC temperature.

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

Cited by 9 publications

References 50 publications

Sulfate and chloride resistance of bottom ASH doped slag-based geopolymer composites

Sulfate and chloride resistance of bottom ASH doped slag-based geopolymer composites

Physical and mechanical properties of C class fly ash based lightweight geopolymer mortar produced with expanded vermiculite aggregate

Influences of high temperature on mechanical properties of fly ash based geopolymer mortars reinforced with PVA fiber

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