Thermomechanical properties of environmentally friendly slag-based geopolymer foam composites in different curing conditions

Ersoy, Hüseyin; Çavuş, Murat

doi:10.1007/s11356-023-26663-5

Cited by 5 publications

(3 citation statements)

References 55 publications

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“…Alkali-activated/geopolymer composites are produced by activating aluminosilicatebased materials with various alkali activators. These activators are usually sodium silicate (Na 2 SiO 3 ), sodium hydroxide (NaOH), and potassium hydroxide (KOH), which are sometimes used together or individually [21][22][23]. Although KOH has higher alkalinity than NaOH, it has a lower activation potential.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of New Geopolymer Composite with Inclusion of Slag and Construction Waste Firebrick at Elevated Temperatures

et al. 2023

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This study investigates the effect of elevated temperatures on slag-based geopolymer composites (SGC) with the inclusion of firebrick powder (FBP). There is a limited understanding of the properties of SGC with the inclusion of FBP when exposed to elevated temperatures and the effects of cooling processes in air and water. In this regard, in the preliminary trials performed, optimum molarity, curing temperature, and curing time conditions were determined as 16 molarity, 100 °C, and 24 h, respectively, for SGCs. Then, FBP from construction and demolition waste (CDW) was substituted in different replacement ratios (10%, 20%, 30%, and 40% by slag weight) into the SGC, with optimum molarity, curing temperature, and curing time. The produced SGC samples were exposed to elevated temperature effects at 300, 600, and 800 °C and then subjected to air- and water-cooling regimes. The ultrasonic pulse velocity, flexural strength, compressive strength, and mass loss of the SGCs with the inclusion of FBP were determined. In addition, scanning electron microscopy (SEM) analyses were carried out for control (without FBP) and 20% FBP-based SGC cooled in air and water after elevated temperatures of 300 °C and 600 °C. The results show that the compressive and flexural strength of the SGC samples are higher than the control samples when the FBP replacement ratio is used of up to 30% for the samples after the elevated temperatures of 300 °C and 600 °C. The lowest compressive and flexural strength results were obtained for the control samples after a temperature of 800 °C. As a result, the elevated temperature resistance can be significantly improved if FBP is used in SGC by up to 30%.

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Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of New Geopolymer Composite with Inclusion of Slag and Construction Waste Firebrick at Elevated Temperatures

et al. 2023

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“…Existence of waste from the construction sector and due to its adverse environmental effects, it is desirable to reutilize this waste and to promote a sustainable waste recycling. This has encouraged many researchers to creat some solutions to evaluate the construction and demolition wastes [1][2][3][4][5]. This is often applied to materials as asphalt, brick, concrete, ferrous metal, ceramics and glass [6].…”

Section: Introductionmentioning

confidence: 99%

“…However, construction demolition waste such as concrete, ceramics and brick, is usually dumped into the ground without being reused [7]. In this concern, the environment has been deteriorated while the lands are occupied with debris [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study on Portland Cement Pastes Containing Sanitary Ware Ceramic Wastes at Elevated Temperatures

Darweesh

2023

JSMPM

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Resistance of Portland cement pastes incorporated 20 wt. % sanitary ware ceramic nano-powder wastes to firing temperatures from 100 up to 600 ℃ was investigated. Results revealed that all physical and mechanical properties were improved and gradually enhanced with firing temperatures, but only up to 400 ℃, and then adversely affected with any further increase of firing temperatures than 400 ℃, i.e. water absorption and total porosity decreased, whereas bulk density was enhanced. Water absorption and total porosity were decreased by 10 and 4 %, respectively, while bulk density was increased by 2.25 %. Furthermore, flexural and compressive strengths were also improved and increased by 1.69 and 1.2 %, respectively. Fourier transform infrared spectra (FT-IR) showed the disappearance of free lime and ettringite on firing. Scanning electron microscopy (SEM) showed that the crystal phase growth of the formed hydration products as a result of both normal hydration and pozzolanic reactions at ambient temperature were developed and modified due to the temperature exposure. The hardened cement pastes can withstand and resist only up to 400 ℃.

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Deep learning–based prediction of compressive strength of eco-friendly geopolymer concrete

Tanyildizi

2024

Environ Sci Pollut Res

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The greenhouse gases cause global warming on Earth. The cement production industry is one of the largest sectors producing greenhouse gases. The geopolymer is produced with synthesized by the reaction of an alkaline solution and the waste materials such as slag and fly ash. The use of eco-friendly geopolymer concrete decreases energy consumption and greenhouse gases. In this study, the fc (compressive strength) of eco-friendly geopolymer concrete was predicted by the deep long short-term memory (LSTM) network model. Moreover, the support vector regression (SVR), least squares boosting ensemble (LSBoost), and multiple linear regression (MLR) models were devised to compare the forecast results of the deep LSTM algorithm. The input variables of the models were used as the mole ratio, the alkaline solution concentration, the curing temperature, the curing days, and the liquid-to-fly ash mass ratio. The output variable of the proposed models was chosen as the compressive strength (fc). Furthermore, the effects of the input variable on the fc of eco-friendly geopolymer concrete were determined by the sensitivity analysis. The fc of eco-friendly geopolymer concrete was predicted by the deep LSTM, LSBoost, SVR, and MLR models with 99.23%, 98.08%, 78.57%, and 88.03% accuracy, respectively. The deep LSTM model forecasted the fc of eco-friendly geopolymer concrete with higher accuracy than the SVR, LSBoost, and MLR models. The sensitivity analysis obtained that the curing temperature was the most important experimental variable that affected the fc of geopolymer concrete.

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Thermomechanical properties of environmentally friendly slag-based geopolymer foam composites in different curing conditions

Cited by 5 publications

References 55 publications

Experimental Evaluation of New Geopolymer Composite with Inclusion of Slag and Construction Waste Firebrick at Elevated Temperatures

Experimental Evaluation of New Geopolymer Composite with Inclusion of Slag and Construction Waste Firebrick at Elevated Temperatures

Study on Portland Cement Pastes Containing Sanitary Ware Ceramic Wastes at Elevated Temperatures

Deep learning–based prediction of compressive strength of eco-friendly geopolymer concrete

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