From dolomite waste to katoite-based binder: Synthesis, performance and characterization

Abbass, Ahmed Mohamed; Elrahman, Mohamed Abd; Sikora, Paweł; Strzałkowski, Jarosław; Stephan, Dietmar; Abdel‐Gawwad, Hamdy A.

doi:10.1016/j.jobe.2023.106971

Cited by 10 publications

(1 citation statement)

References 46 publications

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“…Wollastonite is not hydraulic, but it reacts in the presence of CO 2 and moisture and subsequently hardens [5]. This has the significant benefit of permanently sequestering CO 2 within the concrete during the curing process [6]. It also reduces the amount of water required for concrete production [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of EAF Slag on the Performance of Wollastonite Mixes Inspired by CO2 Curing Technology

Muthu,

Kumar,

Chajec

et al. 2024

Applied Sciences

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Replacement of cement with electric arc furnace (EAF) slag at higher volumes causes volumetric expansion; therefore, such blends are not recommended in concrete production. In this study, the effect of this slag on the performance and microstructure of mortar samples based on wollastonite (CaSiO3) was examined. The samples were cured in a CO2-rich environment, resulting in the formation of non-expansive products, including aragonite, calcite, and traces of tobermorite in the microstructure. The addition of slag above 20% affected the workability and strength developments. However, the formation of pores above 100 nm reduced with increasing slag content to 60%, highlighting the beneficial effect of slag when used in higher volumes. EAF slag contains a higher amount of Fe2O3 which limits its disposal at landfills, but its increased use in the production of CO2 gas-cured wollastonite concrete can reduce the environmental burdens caused by the Portland cement and steel manufacturing industries.

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Section: Introductionmentioning

confidence: 99%

Effect of EAF Slag on the Performance of Wollastonite Mixes Inspired by CO2 Curing Technology

Muthu,

Kumar,

Chajec

et al. 2024

Applied Sciences

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Exploring the influence of carbonate minerals on the performance, volume stability, and phase composition of alkali‐activated waste glass binder at high temperatures

Shereiqi,

Al‐Jabri,

Meddah

et al. 2024

Structural Concrete

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Alkali‐activated waste glass (AA‐WG) has received much attention because to its high mechanical properties achieved with low energy demand. However, AA‐WG exhibits low stability, including volume expansion, porosity increment, and a reduction in compressive strength. Enhancing the stability of AA‐WG could improve its commercial viability and expand its range of applications. Therefore, this study aims to evaluate the role of calcite CaCO3 (CC) and magnesite MgCO3 (MC) in enhancing the physicomechanical properties and phase composition of AA‐WG at elevated temperatures. The proposed strategy includes replacing WG with different contents of CC and MC, followed by activation with a 4 M NaOH solution and curing at 100°C for 24 h. The hardened samples were then exposed to 800°C for a 2 h holding time to evaluate the thermal stability of the AA‐WG, AA‐WG‐CC, and AA‐WG‐MC mixtures. The results demonstrated that increasing the CC content up to 50 wt.% significantly enhanced the compressive strength of the AA‐WG when cured at 100°C, while the incorporation of MC caused a negative effect. Surprisingly, an opposite trend was observed at a higher temperature of 800°C, where the samples containing MC exhibit better mechanical and physical performance compared to those with CC. The variation in the type, composition, and weight loss upon ignition of the carbonate‐based minerals significantly influenced the stability and phase composition of the thermally exposed AA‐WG. Although the sample with 50 wt.% MC showed higher volume shrinkage, it demonstrated higher compressive strength (~82 MPa) at 800°C than the sample with 50 wt.% CC (~7 MPa). This difference can be attributed to the formation of diopside CaMgSi2O6 and forsterite Mg2SiO4, which have higher crystallinity, specific gravity, and hardness compared to wollastonite CaSiO3 and the tri‐calcium silicate phases Ca3SiO4.

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Critical parameters affecting the thermal resistance of alkali-activated aluminosilicate wastes: Current understanding and future directions

Abbass

Elrahman

Abdel‐Gawwad

et al. 2023

Environ Sci Pollut Res

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From dolomite waste to katoite-based binder: Synthesis, performance and characterization

Cited by 10 publications

References 46 publications

Effect of EAF Slag on the Performance of Wollastonite Mixes Inspired by CO2 Curing Technology

Effect of EAF Slag on the Performance of Wollastonite Mixes Inspired by CO2 Curing Technology

Exploring the influence of carbonate minerals on the performance, volume stability, and phase composition of alkali‐activated waste glass binder at high temperatures

Critical parameters affecting the thermal resistance of alkali-activated aluminosilicate wastes: Current understanding and future directions

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