Preparation and Characterization of an Eco-Friendly Binder from Alkali-Activated Aluminosilicate Solid Industrial Wastes Containing CKD and GGBS

Heikal, Mohamed; Zaki, Magdi E. A.; Alshammari, Abdulrahman G.

doi:10.1061/(asce)mt.1943-5533.0002286

Cited by 6 publications

(2 citation statements)

References 45 publications

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“…The lime peaks at 32.3°and 56.5° in the CKD powder completely disappeared, suggesting that Ca 2+ was integrated into the binder structure. In addition, free Ca 2+ acted as a charge balancer for alumina, forming C-(A)-S-H gel during hydration [ 36 ]. However, when the quicklime content was 20%, the diffraction peaks corresponding to portlandite and calcite in the D6 specimen experienced a reduction.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Behavior and Microstructure Evaluation of Quicklime-Activated Cement Kiln Dust-Slag Binder Pastes

Hu,

Dong,

Cui

et al. 2024

Materials

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Cement kiln dust (CKD) is a by-product of cement production, which has the shortcomings of low utilization and high-temperature activation. This study combined CKD and slag as precursors for preparing pastes through quicklime activation under ambient conditions. The effects of quicklime and CKD content on the workability (flowability and setting time), macro-mechanical properties, and micro-structure of the CKD-slag binders were analyzed. The experimental results showed that the rapid precipitation of Ca2+, Si4+, and Al3+ ions from the CKD provided more nucleation sites for the formation of calcium aluminosilicate hydrate (C-(A)-S-H) gel and enhanced the reactivity of the binder system under the influence of the activator (CaO). The specimens had the highest unconfined compressive strength (UCS) (24.6 MPa) after 28 days with 10% quicklime content and 60% CKD content; scanning electron microscopy with energy-dispersive X-ray (SEM-EDX) analysis showed that the Ca/Si ratio of the C-(A)-S-H gel was minimized, leading to a denser microstructure and better binding ability under this mixing proportion. Therefore, this study may provide novel binder materials with a high proportion of CKD under ambient conditions.

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Section: Resultsmentioning

confidence: 99%

Mechanical Behavior and Microstructure Evaluation of Quicklime-Activated Cement Kiln Dust-Slag Binder Pastes

Hu,

Dong,

Cui

et al. 2024

Materials

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“…As for G-2 (60 d), there are several weak AFt diffraction peaks. It is evident from Table 2 that the CaO content of slag and fly ash is lower than that of cement; thus, they lack the ion concentration required to generate AFt [ 36 ]. The XRD results show that the main product of the geopolymer-stabilized soil is hydrated sodium aluminosilicate (N-A-S-H) gel, which has a very stable three-dimensional network structure.…”

Section: Resultsmentioning

confidence: 99%

Experimental Study on Durability Degradation of Geopolymer-Stabilized Soil under Sulfate Erosion

Wang

Chen²,

Xia

et al. 2022

Materials

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In this study, the potential application of slag-fly ash-based geopolymers as stabilizers for soft soil in sulfate erosion areas was investigated to promote environmental protection and waste residue recycling. The changes in the physical and mechanical properties and microstructure characteristics of cement-stabilized soil/geopolymer-stabilized soil under sulfate erosion were comparatively studied through tests such as appearance change, mass change, strength development, and microscopic examination. The results show that the sulfate resistance of stabilized soil is significantly affected by the stabilizer type. In the sulfate environment, the cement-stabilized soil significantly deteriorates with erosion age due to the expansion stress induced by AFt, while the geopolymer-stabilized soil exhibits excellent sulfate resistance. The slag-fly ash ratio (10:0, 9:1, 8:2 and 7:3) is an important factor affecting the sulfate resistance of geopolymer-stabilized soils, and the preferred value occurs at 9:1 (G-2). When immersed for 90 d, the unconfined compressive strength value of G-2 is 7.13 MPa, and its strength retention coefficient is 86.6%. The N-A-S-H gel formed by the polymerization in the geopolymer contributes to hindering the intrusion of sulfate ions, thereby improving the sulfate resistance of stabilized soil. The research results can provide a reference for technology that stabilizes soil with industrial waste in sulfate erosion areas.

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Geopolymers vs. alkali-activated materials (AAMs): A comparative study on durability, microstructure, and resistance to elevated temperatures of lightweight mortars

Ameri

Shoaei

Zareei

et al. 2019

Construction and Building Materials

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Preparation and Characterization of an Eco-Friendly Binder from Alkali-Activated Aluminosilicate Solid Industrial Wastes Containing CKD and GGBS

Cited by 6 publications

References 45 publications

Mechanical Behavior and Microstructure Evaluation of Quicklime-Activated Cement Kiln Dust-Slag Binder Pastes

Mechanical Behavior and Microstructure Evaluation of Quicklime-Activated Cement Kiln Dust-Slag Binder Pastes

Experimental Study on Durability Degradation of Geopolymer-Stabilized Soil under Sulfate Erosion

Geopolymers vs. alkali-activated materials (AAMs): A comparative study on durability, microstructure, and resistance to elevated temperatures of lightweight mortars

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