Investigation on the effects of desulfurization gypsum on the engineering properties of ternary geopolymers: Improving the utilization of industrial wastes

Wang, Jianhua; Ma, Tao; Luan, Yingcheng; Wang, Siqi; Yang, Zhiqiang

doi:10.1016/j.jclepro.2023.137638

Cited by 13 publications

(3 citation statements)

References 30 publications

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“…This increased porosity subsequently led to the deterioration of the strength. Similar results were obtained in an earlier study with Desulfurization gypsum [33]. Additionally, since a certain percentage of FA-GGBS is replaced with GY, the formation of reaction products is reduced due to the lower dissolution rate of (Ca 2+ ), (Si 2+ ), and (Al 3+ ) ions.…”

Section: Figure 4 Sem Images Of Aac With Varying Gy Contentsupporting

confidence: 88%

“…Similarly, under the action of alkalis, (Ca 2+ ) and (SiO4 4-) ions were released from GGBS. Released ions combined with alkali metal ions and generated gel-like crystalline structures, primarily composed of calcium silicate hydrate (C-S-H), calcium aluminosilicate hydrate (C-A-S-H), Sodium aluminosilicate hydrate (N-A-S-H) and other compounds by polymerization in FA-GGBS-based AAC which contributed to the binding properties and strength gain in AAC [33]. GY, predominantly composed of calcium sulfate dihydrate, contributes calcium (Ca 2+ ) ions to the system in the presence of alkalis.…”

Section: Figure 3 Variation In Mechanical Strengths Of Aac With Varyi...mentioning

confidence: 99%

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Influence of Gypsum on the Residual Properties of Fly Ash-Slag-Based Alkali-Activated Concrete

G. S.,

Pandit,

Prashanth

et al. 2024

Civ Eng J

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High-temperature exposures of concrete lead to serious damage in concrete structures, resulting in the significant decay of mechanical properties and spalling of concrete. Alkali-activated concretes (AAC) of blended aluminosilicate precursors and activators have been proven to have higher thermal endurance than conventional portland cement concrete. Incorporation of gypsum (GY) in alkali-activated systems has proven to positively impact the mechanical properties when adopted in controlled amounts. GY releases SO42- to the binder system, which helps in the formation of ettringites, along with Ca2+, which leads to the formation of hydrates. This causes a reduction in porosity and improves strength gain. Incorporation of GY into the fly ash-slag-based alkali-activated system further improves thermal endurance by retaining considerable residual strengths even after 800°C exposure. In the present study, the influence of GY on the residual mechanical properties of fly ash-slag-based AAC is investigated to explore the thermal endurance of the ternary mix at elevated temperatures. The mechanical properties of fly ash (FA), Ground Granulated Blast Furnace Slag (GGBS), and gypsum (GY) ternary blended AAC subjected to elevated temperatures are studied in comparison with conventional portland cement concrete (control mix). AAC design mixes with varying proportions of GY as a replacement to FA-GGBS precursor are tested for mechanical properties to obtain the optimum mix. The residual mechanical properties of the FA-GGBS-GY optimum ternary AAC mix are obtained after exposure to elevated temperatures up to 800°C. The morphology and microstructural characteristics of AAC are studied by Scanning Electron Microscopy (SEM) and Energy-Dispersive X-ray Spectroscopy (EDS) analyses to investigate the influence of gypsum on the thermal endurance of concrete when exposed to elevated temperatures. Improved thermal endurance is observed for AAC when FA-GGBS precursors are replaced with 5% of GY as compared to the thermal endurance of conventional portland cement concrete (PCC) of the same compressive strength. Doi: 10.28991/CEJ-2024-010-03-017 Full Text: PDF

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Section: Figure 4 Sem Images Of Aac With Varying Gy Contentsupporting

confidence: 88%

Section: Figure 3 Variation In Mechanical Strengths Of Aac With Varyi...mentioning

confidence: 99%

Influence of Gypsum on the Residual Properties of Fly Ash-Slag-Based Alkali-Activated Concrete

G. S.,

Pandit,

Prashanth

et al. 2024

Civ Eng J

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“…The rate of paste setting increases with the increase in fine aggregate content. Second, it can be seen that the setting time of the RMC increases with the increase in FGD/(RM + CG), which is due to the fact that FGD tends to adhere to the surface of particles during the early hydration reaction process with the product of PC, ettringite crystals, which hinders the progress of the reaction and thus increases the setting time [49,50].…”

Section: Flow and Setting Time Analysismentioning

confidence: 99%

Resource Utilization Potential of Red Mud: A Study on the Micro-Mechanism of the Synergistic Effect of Multiple Solid Waste Filling Materials

Zhang,

Yan,

Bai

et al. 2023

Sustainability

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Red mud (RM) is a common industrial byproduct that is characterized by high alkalinity, high pollution, and difficult utilization. In this paper, gangue (CG), flue gas desulfurization gypsum (FGD), and silicate cement (PC) were used to assist red mud in the preparation of red mud-based composite filler material (RMC), aiming at the large-scale resource utilization of RM. The effects of the mass ratio of RM/CG, the mass ratio of FGD/(RM + CG), and the water–solid ratio (WCR) on the multi-angle properties of RMC were investigated and the optimal ratios were determined. The results showed that the RM/CG was 7:1, FGD/(RM + CG) was 4%, and WCR was 0.51 (RMC8), and the system could increase the RM content to 70%. The microstructural analysis of RMC using a specific surface area and porosity analyzer (BET), X-ray diffractometer (XRD), and scanning electron microscope (SEM) showed that its hydration products could remodel the pore structure, encapsulate and cement the coarse and fine particles into a dense matrix, and play a certain alkali reduction role, which revealed the microscopic synergistic mechanism between multiple solid wastes. The study shows that the comprehensive disposal of RM reduces the pollution released into the environment and provides new ideas for the green development of mines.

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Investigation on performance improvement of dredged sediment with high water content stabilized with alkali-activated materials

Wang,

Ding

et al. 2023

J Soils Sediments

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Investigation on the effects of desulfurization gypsum on the engineering properties of ternary geopolymers: Improving the utilization of industrial wastes

Cited by 13 publications

References 30 publications

Influence of Gypsum on the Residual Properties of Fly Ash-Slag-Based Alkali-Activated Concrete

Influence of Gypsum on the Residual Properties of Fly Ash-Slag-Based Alkali-Activated Concrete

Resource Utilization Potential of Red Mud: A Study on the Micro-Mechanism of the Synergistic Effect of Multiple Solid Waste Filling Materials

Investigation on performance improvement of dredged sediment with high water content stabilized with alkali-activated materials

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