Setting and Hardening Behaviour of Alkali-Activated Landfilled Fly Ash–Slag Binder at Room Temperature

Liu, Wei; Lin, Lin; Wang, Shuping; Peng, Xiaoqin; Wu, Bobo; Sun, Keke; Zeng, Lu

doi:10.3390/ma13143130

Cited by 10 publications

(5 citation statements)

References 43 publications

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“…Wang et al [21] reduced the crystallinity and surface binding energy of iron tailings by wet milling, which improved the reactivity and facilitated the hydration of reactive silica-aluminum phases in SS by MIOT participation, and improved the mechanical properties of the slurry. On the other hand, excitation using chemical activators [22][23][24][25][26] is also an effective means to induce chemical bond rupture by dissolving and corroding the internal crystal structure, and reactive SiO 2 and Al 2 O 3 are effectively released, resulting in the generation of a large amount of calcium silicate hydrate (C-S-H) gel and ettringite (AFt), which is in agreement with the findings of the studies of references [10,24,25,27]. Although the above activation modes changed the gelling properties of the precursors, they were not favorable for large-scale use.…”

Section: Introductionsupporting

confidence: 89%

“…Treatment is quite difficult, the comprehensive utilization rate is generally low, and the main treatment is mainly by piling up, which not only encroaches on a large amount of land resources, but also causes great harm to the natural ecological environment and the social and economic environment. As an alternative to conventional cement, the preparation of alkali-inspired cementitious materials (AAMs) [9][10][11] and supplementary cementitious materials (SCMs) [12][13][14][15][16][17][18] from bulk industrial solid wastes has become a focus of research. They have lower environmental pollution, energy consumption and production costs compared to OPC.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Properties and Hydration Mechanism of Gypsum-Based Composite Cementitious Materials

Liu,

Song,

et al. 2024

Buildings

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In order to achieve the resourceful, large-scale and high-value utilization of bulk industrial solid wastes such as flue gas desulfurization gypsum (FGDG), fly ash (FA) and ground blast furnace slag (GGBS), and to reduce the dosage of cementitious materials, orthogonal experimental methods were used to prepare composite cementitious materials based on the principle of synergistic coupling and reconstruction of multi-solid wastes. Through the method of extreme difference and ANOVA, the influence law of different factor levels on the performance of the cementitious materials was studied, and the maximum compressive strength of cementitious materials was reached when the ordinary Portland cement (OPC) dosage was 20%, the FGDG dosage was 56%, the FA dosage was 19.2% and the slag dosage was 4.8%, and the W/B was 0.55. The hydration products and microscopic morphology of the cementitious materials were analyzed by means of XRD, SEM and MIP techniques, so as to elucidate the complex synergistic hydration mechanism, and then to determine the more optimal group distribution ratio. The results show that the hydration reaction between FGDG and OPC can be synergistic with each other, and C-A-H further generates AFt under the action of SO42−, and at the same time, it plays the role of alkali-salt joint excitation for FA–GGBS, generates a large amount of cementitious materials, fills up the pores of the gypsum crystal structure, and forms a dense microstructure.

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Section: Introductionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Properties and Hydration Mechanism of Gypsum-Based Composite Cementitious Materials

Liu,

Song,

et al. 2024

Buildings

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“…The most important bands positioned in the range of 750-1,400 cm −1 are related to the stretching vibration of Si-O-T (where T = Si, Al, Ti, and Na etc.) (Liu et al, 2020), as illustrated in Figure 9. The band at 950-970 cm −1 was ascribed to the Q 2 units of Si-O-Si (Lodeiro et al, 2009).…”

Section: Ftir Spectrummentioning

confidence: 98%

Effect of Extracted Titanium Tailing Slag on the Properties of Alkali-Activated Fly Ash-Ground Blast Furnace Slag Binder

Wang

Yun

et al. 2022

Front. Mater.

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The extracted titanium tailings slag (TS) is a by-product of titanium extraction from the blast furnace slag. Its chemical composition is similar to that of ground granulated blast furnace slag (GGBS), but the relatively lower reactivity limited its utilization as a supplementary cementitious material. In this study, the reactivity of TS was improved by mechanical grinding, and the optimum property of finely ground TS was selected to replace fly ash (FA) in the alkali-activated FA-GGBS binder. The influence of TS content on the fluidity, setting time, and compressive strength of the ternary binder was investigated. X-Ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy were used to analyze the effect of TS on the reaction process. Results showed that the optimum reactivity index of TS was 81.18% at 28 days when it was ground for 15 min in a ball mill. The highest compressive strength of the alkali-activated ternary binder was achieved when the replacement of FA by ground TS was 40%, and its 28-day compressive strength was 49.3 MPa, approximately 22% higher than the binder without TS. The addition of the TS would accelerate the reaction process of binder to form more products, including C-(A)-S-H and gismondine.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Geopolymer Concrete Compositesmentioning

confidence: 99%

3D Printable Geopolymer Composites Reinforced with Carbon‐Based Nanomaterials – A Review

Basha

Rehman

Khalid

et al. 2023

The Chemical Record

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Three‐dimensional (3D) geopolymer printing (3DGP) technology is a rapidly evolving digital fabrication method used in the construction industry. This technology offers significant benefits over 3D concrete printing in terms of energy saving and reduced carbon emissions, thus promoting sustainability. 3DGP technology is still evolving, and researchers are striving to develop high‐performance printable materials and different methods to improve its robustness and efficiency. Carbon‐based nanomaterials (CBNs) with beneficial properties have a wide range of applications in various fields, including as concrete/geopolymer systems in construction. This paper comprehensively reviews the research progress on carbon‐based nanomaterials (CBNs) used to develop extrusion‐based 3D geopolymer printing (3DGP) technology, including dispersion techniques, mixing methods, and the materials′ performance. The rheological, mechanical, durability, and other characteristics of these materials are also examined. Furthermore, the existing research limitations and the prospects of using 3DGP technology to produce high‐quality composite mixtures are critically evaluated.

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Setting and Hardening Behaviour of Alkali-Activated Landfilled Fly Ash–Slag Binder at Room Temperature

Cited by 10 publications

References 43 publications

Experimental Study on the Properties and Hydration Mechanism of Gypsum-Based Composite Cementitious Materials

Experimental Study on the Properties and Hydration Mechanism of Gypsum-Based Composite Cementitious Materials

Effect of Extracted Titanium Tailing Slag on the Properties of Alkali-Activated Fly Ash-Ground Blast Furnace Slag Binder

3D Printable Geopolymer Composites Reinforced with Carbon‐Based Nanomaterials – A Review

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