Effect of microwave curing as compared with conventional regimes on the performance of alkali activated slag pastes

El-Feky, M.S.; Kohail, Mohamed; El-Tair, Ahmed Maher; Serag, Mohamed

doi:10.1016/j.conbuildmat.2019.117268

Cited by 64 publications

(22 citation statements)

References 28 publications

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“…6 and 14, the samples cured in traditional oven took approximately 5 days to achieve a similar compressive strength of MG samples cured for 40 s, indicating that microwave curing significantly shortens the required curing duration. Similar conclusion has been reported in previous studies [25,39]. With microwave curing method, production efficiency of geopolymer can be further improved.…”

Section: Environmental Impact and Cost-benefit Analysissupporting

confidence: 90%

Feasibility of using microwave curing to enhance the compressive strength of mixed recycled aggregate powder based geopolymer

Tan

Cai

Huang³

et al. 2020

Construction and Building Materials

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Section: Environmental Impact and Cost-benefit Analysissupporting

confidence: 90%

Feasibility of using microwave curing to enhance the compressive strength of mixed recycled aggregate powder based geopolymer

Tan

Cai

Huang³

et al. 2020

Construction and Building Materials

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“…Alternatively, the alkaline activator solution can be added to the alumina-silicate source separately, and then the wet binder can be mixed with extra water (if the concentration of the alkaline solution needs to be diluted), aggregates and additive materials to build a concrete or mortar. Instead, alkali-activated cement can be produced by mixing alumina-silicate source, alkaline activator, water, aggregates, and admixture without pre-producing the alkali-activated binder [ 76 , 77 , 78 ].…”

Section: Steel Waste Managementmentioning

confidence: 99%

Recent Developments in Steelmaking Industry and Potential Alkali Activated Based Steel Waste: A Comprehensive Review

et al. 2022

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The steel industry is responsible for one-third of all global industrial CO2 emissions, putting pressure on the industry to shift forward towards more environmentally friendly production methods. The metallurgical industry is under enormous pressure to reduce CO2 emissions as a result of growing environmental concerns about global warming. The reduction in CO2 emissions is normally fulfilled by recycling steel waste into alkali-activated cement. Numerous types of steel waste have been produced via three main production routes, including blast furnace, electric arc furnace, and basic oxygen furnace. To date, all of the steel waste has been incorporated into alkali activation system to enhance the properties. This review focuses on the current developments over the last ten years in the steelmaking industry. This work also summarizes the utilization of steel waste for improving cement properties through an alkali activation system. Finally, this work presents some future research opportunities with regard to the potential of steel waste to be utilized as an alkali-activated material.

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“…This high energy consumption is due to the presence of calcium carbonate with a high percentage (80%) in PC clinker chemical composition, which is a poor microwave-heating absorber compared to iron (Fe 3 O 4 ), aluminum (Al 2 O 3 ) and silicon (SiO 2 ) oxides. However, the presence of a high percentage of Al 2 O 3 and SiO 2 oxides in AABs qualifies the microwave heating of aluminosilicate materials to be more effective with low energy consumption 64 , 80 . Kim et al 81 reported that the existence of Al 2 O 3 and SiO 2 oxides with high content in clay-based materials guarantees high absorption of microwave energy and good heating and curing process.…”

Section: Introductionmentioning

confidence: 99%

“…Microwave heating is a recent technology used in cement and concrete industries with high interest and continuous improvement due to its many advantages [63][64][65][66] . Compared to conventional heating, microwave heating has a short operation cycle due to rapid heating rates with the short heating time required, safe, controlled operation due to instantaneous electronic control, and energy optimization through its' volumetric and selective…”

mentioning

confidence: 99%

Utilization of optimized microwave sintering to produce safe and sustainable one-part alkali-activated materials

Refaat

Mohsen

Nasr

et al. 2023

Sci Rep

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Sodium hydroxide (NaOH) as an alkaline activator presents a vital limitation in the mass production of alkali-activated binders due to its severe effect on users’ safety. In this study, safe and sustainable one-part alkali-activated slag mixes (OP-AAS) were prepared through an efficient microwave sintering for a mixture of active amorphous ground granulated blast furnace slag (GGBFS) and sodium hydroxide powder (NaOH). Different microwave-sintered powders were prepared using microwave energy of power 900 W for the mixture at different treatment periods (10, 20, and 30 min). Fresh and hardened properties of different OP-AAS mixes were studied. Moreover, the phase composition and microstructure were investigated using X-ray diffraction (XRD) analysis and scanning electron microscope (SEM). Cytotoxicity/viability testing was performed to evaluate the cell death induced by the developed materials to measure their safety for the user. According to compressive strength, cytotoxicity/viability analysis, environmental impact and cost calculation of developed OP-AAS, it is concluded that employing microwave sintering for a short duration is sufficient to produce safe binding materials with adequate mechanical properties suitable for commercial applications in the construction sector.

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Effect of microwave curing as compared with conventional regimes on the performance of alkali activated slag pastes

Cited by 64 publications

References 28 publications

Feasibility of using microwave curing to enhance the compressive strength of mixed recycled aggregate powder based geopolymer

Feasibility of using microwave curing to enhance the compressive strength of mixed recycled aggregate powder based geopolymer

Recent Developments in Steelmaking Industry and Potential Alkali Activated Based Steel Waste: A Comprehensive Review

Utilization of optimized microwave sintering to produce safe and sustainable one-part alkali-activated materials

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