The utilization of waste incineration filter dust (WIFD) in sodium carbonate activated slag mortars

Ling, Xuan; Schollbach, Katrin; Liu, Gang; Brouwers, Hjh Jos

doi:10.1016/j.conbuildmat.2021.125494

Cited by 5 publications

(3 citation statements)

References 57 publications

(65 reference statements)

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“…Although each hydration product has its own decomposition temperature range, it is still difficult to distinguish between them due to the overlaps in some temperature ranges. For example, the peak between 40 °C and 150 °C was attributed to the dehydration of C-(A)-S-H based on a previous study [ 40 ]. However, the peak located at approximately 120 °C was mainly attributed to the dehydration of gaylussite, affecting the accurate amount of C-(A)-S-H phase by TGA quantification.…”

Section: Resultsmentioning

confidence: 96%

“…For example, the strength values of the CR5S5, CR10S5, CR15S5, CR20S5, and CR30S5 mortars were 20.4, 24.5, 27.8, 25.9, and 20.8 MPa at 3 days, respectively, and the CR15S5 obtained the highest compressive strength. Generally, the C-(A)-S-H gels produced by GBFS hydration played a major role in the compressive strength improvement of mortars [ 40 ]. In the process of early-age hydration, the OH − was rapidly formed by the reaction between Na 2 CO 3 and CRCF, which promoted the dissolution of GBFS and increased the strength-giving phase in substances such as C-(A)-S-H gels.…”

Section: Resultsmentioning

confidence: 99%

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Accelerating the Reaction Kinetics of Na2CO3-Activated Slag Mortars by Calcined Recycled Concrete Fines

Wang

et al. 2022

Materials

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Sodium carbonate (Na2CO3), an environmentally friendly activator, has been shown to have vast potential for the development of sustainable alkali-activated slag mortars. However, Na2CO3-activated slag mortars exhibit a delayed reaction process and limited early-age strength development, restricting their wider application. In this work, the recycled concrete fines were calcined at a temperature of 800 °C for 1 h and then used as an auxiliary activator to improve the reaction kinetics of Na2CO3-activated slag mortars. The impact of the calcined recycled concrete fines (CRCF) dosage and Na2CO3 concentration on the compressive strength, hydration kinetics, and phase assemblage of mortars was evaluated. The results show that CRCF can react directly with Na2CO3 in the early stages, swiftly removing the CO32− in aqueous solution and providing an alkaline environment suitable for the dissolution of slag. This promotes the development of C-(A)-S-H, hydrotalcite, hemicarbonate, and monocarbonate. The hydration process and strength-giving phase of mortars can be improved further, as an increase in Na2CO3 concentration increases the initial alkaline content. Additionally, the most remarkable compressive strength value of 39.2 MPa was observed at 28 days in the mortar with 6% sodium oxide equivalent (Na2O-E) of Na2CO3 and 15% CRCF because of the synergistic effect of CRCF and Na2CO3.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Accelerating the Reaction Kinetics of Na2CO3-Activated Slag Mortars by Calcined Recycled Concrete Fines

Wang

et al. 2022

Materials

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“…Low alkalinity, ease of operation, and good performance are the advantages of carbonate activation, which has drawn significant attention from the academic and industrial fields in recent years [ 1 , 2 , 3 ]. The long setting time caused by slow hydration is the major challenge that is still to meet the basic requirements for in situ applications [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

C-S-H Seeds Accelerate Early Age Hydration of Carbonate-Activated Slag and the Underlying Mechanism

et al. 2023

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The slow hardening process of carbonate-activated slag limits its application as a construction material. This paper aims to provide an acceleration method for the early age hydration of carbonate-activated slag by applying calcium silicate hydrate (C-S-H) seeds and unveil the underlying mechanism. The results show that the incorporation of C-S-H seeds significantly accelerates the early age reaction of carbonate-activated slag and shortens the setting time. With 4% of calcium silicate hydrate (C-S-H) seeds, the 1d-compressive strength of carbonate activates slag can achieve 25.4 MPa. The C-S-H seeds acts as the preferred nucleation sites for the strength-giving phase C-A-S-H gel and the carbonate-containing phases (e.g., calcite, gaylussite, hydrotalcite, etc.), and accelerates hydration. The dormant period of samples with C-S-H seeds becomes negligible, confirming that the seeding effect that controls the saturation limits of the pore solution is the major reason for the accelerated hydration.

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Valorization of biomass bottom ash in alkali-activated GGBFS-fly ash: Impact of biomass bottom ash characteristic, silicate modulus and aluminum-anodizing waste

Ling,

Chen,

Schollbach

et al. 2024

Construction and Building Materials

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The utilization of waste incineration filter dust (WIFD) in sodium carbonate activated slag mortars

Cited by 5 publications

References 57 publications

Accelerating the Reaction Kinetics of Na2CO3-Activated Slag Mortars by Calcined Recycled Concrete Fines

Accelerating the Reaction Kinetics of Na2CO3-Activated Slag Mortars by Calcined Recycled Concrete Fines

C-S-H Seeds Accelerate Early Age Hydration of Carbonate-Activated Slag and the Underlying Mechanism

Valorization of biomass bottom ash in alkali-activated GGBFS-fly ash: Impact of biomass bottom ash characteristic, silicate modulus and aluminum-anodizing waste

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