Accelerated carbonation and structural transformation of blast furnace slag by mechanochemical alkali-activation

Marple, Maxwell A. T.; Köroğlu, Batikan; Morrison, Keith; Crowhurst, Jonathan C.; Balachandra, Anagi M.; Soroushian, Parviz; Mason, Harris E.

doi:10.1016/j.cemconres.2022.106760

Cited by 23 publications

(5 citation statements)

References 73 publications

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“…The carbonation inertia of srebrodolskite and mayenite determined the upper limit of calcium leaching. The remaining crystalline phases were dominated by magnesium iron oxide (RO phase), an inert phase present in large quantities in the BOFS, which had a negligible impact on the environmental pollution or the properties of the building material. , However, the FTIR results showed that the absorption peak at 986 cm –1 (corresponding to stretching modes of dimeric Q 2 Si–O–Si/Al linkages) shifted to 1062 cm –1 (stretching modes of Q 3 Si–O–Si/Al) after leaching, which was linked to the polymerization of calcium silicate into decalcified silica gel. , Silica gel has pozzolanic activity and can hydrate with portlandite to form a C–S–H gel.…”

Section: Discussionmentioning

confidence: 99%

“…47,48 However, the FTIR results showed that the absorption peak at 986 cm −1 (corresponding to stretching modes of dimeric Q 2 Si−O−Si/ Al linkages) shifted to 1062 cm −1 (stretching modes of Q 3 Si− O−Si/Al) after leaching, which was linked to the polymerization of calcium silicate into decalcified silica gel. 49,50 Silica gel has pozzolanic activity and can hydrate with portlandite to form a C−S−H gel.…”

Section: Reuse Carbonation Filtrate and Solid Residuementioning

confidence: 99%

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Synthesis of High-Purity and Stable Vaterite Via Leaching–Carbonation of Basic Oxygen Furnace Slag

Song,

Guo,

Ling

2024

ACS Sustainable Chem. Eng.

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Against the backdrop of the limited industrial application and low added value of precipitated calcium carbonate produced through the indirect carbonation of basic oxygen furnace slag (BOFS), this study proposed a simple approach (extracting Ca 2+ from BOFS using ammonium chloride (NH 4 Cl) and subsequently optimizing the aqueous carbonation process) for synthesizing high-purity vaterite with greater added value. The influencing factors in the enhancement of Ca 2+ leaching efficiency and maximization of carbonation to sequester CO 2 were studied. Within a very short time (10 min), a Ca 2+ leaching ratio of 60.3% was achieved, while a 99.5% carbonation ratio was attained by adding NH 4 OH to produce high-purity (98%) homogeneous vaterite. The alkaline pH (∼10.6) of the solution was refined using ammonia to achieve a higher CO 3 2− /Ca 2+ ratio and solution supersaturation for the stimulation of vaterite nucleation. The adsorption of NH 4 + and metal cations from BOFS on the surface of vaterite acted as a crystalline control agent to inhibit the transformation of vaterite into calcite. In addition, the carbonation filtrate can be recycled at least six times with a sustained extraction-carbonation efficiency of over 60% while maintaining the vaterite crystalline integrity. The solid residue was mainly composed of silica gel and inert reducible oxide (RO) phase, which can be used as a potential supplementary cementitious material due to its pozzolanic properties. Findings from this study provide new insights into the valorization of BOFS to mitigate CO 2 emissions and promote the sustainable industrial application of the BOFS indirect carbonation process.

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Section: Discussionmentioning

confidence: 99%

Section: Reuse Carbonation Filtrate and Solid Residuementioning

confidence: 99%

Synthesis of High-Purity and Stable Vaterite Via Leaching–Carbonation of Basic Oxygen Furnace Slag

Song,

Guo,

Ling

2024

ACS Sustainable Chem. Eng.

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“…Figure 6 illustrates the impact of slag activity on the carbonation depth of blended cement containing a 30% GGBS content. The depiction clearly illustrates that blended cement compositions with increased slag activity consistently demonstrate shallower levels of carbonation at various stages of maturation when contrasted with compositions possessing lower slag activity [41]. The influence of slag activity on blended cement is discernible through dual mechanisms.…”

Section: Carbonation Depthmentioning

confidence: 91%

Assessment of CO2 Capture in FA/GGBS-Blended Cement Systems: From Cement Paste to Commercial Products

Liu,

Wu,

et al. 2024

Buildings

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The cement industry’s intricate production process, including kiln heating and fossil fuel use, contributes 5–8% of global CO2 emissions, marking it as a significant carbon emitter in construction. This study focuses on quantifying CO2 capture potential in blended cement systems through the utilisation of phenolphthalein and thermalgravimetric methodologies. Its primary objective is to assess the CO2 absorption capacity of these blended systems’ pastes. Initial evaluation involves calculating the carbon capture capacity within the paste, subsequently extended to estimate CO2 content in the resultant concrete products. The findings indicate that incorporating ground granulated blast-furnace slag (GGBS) or an ettringite-based expansive agent did not notably elevate carbonation depth, irrespective of their fineness. Conversely, the introduction of fly ash (FA) notably augmented the carbonation depth, leading to a substantial 36.4% rise in captured CO2 content. The observed distinctions in carbonation behaviour primarily stem from variances in pore structure, attributable to distinct hydration characteristics between GGBS and FA. Thermal analysis confirms the increased stabilisation of CO2 in FA blends, highlighting the crucial influence of material composition on carbonation and emission reduction. Incorporating both GGBS and FA notably diminishes binder emissions, constituting almost half of PC-concrete emissions. Initially, 60% GGBS shows lower emissions than 50% FA, but when considering CO2 capture, this emission dynamic significantly changes, emphasising the intricate influence of additives on emission patterns. This underscores the complexity of evaluating carbonation-induced emissions in cementitious systems.

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“…Alkali-activated mineral admixtures are manufactured by mixing mineral admixtures, sodium silicate, alkali, water, etc. [12][13][14][15][16]. The alkali-activated mineral admixtures present excellent mechanical strengths.…”

Section: Introductionmentioning

confidence: 99%

The Influence of CO2 Curing on the Mechanical Performance and the Corresponding Chloride Ion Resistance of Alkali-Activated Compound Mineral Admixtures

et al. 2022

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In this paper, the mechanical properties (the flexural strength, compressive strength and the drying shrinkage rate) of CO2-cured alkali-activated compound mineral admixtures (blast furnace slag powder (BFS) and fly ash (FA)) are investigated. In addition, the corresponding chloride ion mobility coefficient is measured. Additionally, the freeze–thaw cycles with an NaCl concentration of 3% is studied. Thermogravimetric analysis and scanning electron microscopy are applied in analyzing the mechanical properties. The curing ages of the alkali-activated compound mineral admixtures are 1 day, 3 days and 28 days. Results show that the mechanical strengths are decreased by the addition of FA and increased by the increasing curing age and CO2 curing. The maximum reducing rates of flexural and compressive strengths by FA are 47.6% and 42.3%. Meanwhile, the corresponding increasing rates by CO2 curing are 26.5% and 23.1%, respectively. The improving effect of alkali-activated BFS by CO2 curing is higher than that of FA. Furthermore, the drying shrinkage rate is increased by the increasing dosages of BFS, the increasing curing ages and CO2 curing. Additionally, CO2 curing and the increasing dosage of BFS leads to decreasing the chloride ion mobility coefficient. Finally, CO2 curing and the addition of BFS can effectively improve the resistance of NaCl freeze–thaw cycles. The compactness of the hydration products is improved by the addition of BFS and the roughness of hydration products is increased by CO2 curing.

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Accelerated carbonation and structural transformation of blast furnace slag by mechanochemical alkali-activation

Cited by 23 publications

References 73 publications

Synthesis of High-Purity and Stable Vaterite Via Leaching–Carbonation of Basic Oxygen Furnace Slag

Synthesis of High-Purity and Stable Vaterite Via Leaching–Carbonation of Basic Oxygen Furnace Slag

Assessment of CO2 Capture in FA/GGBS-Blended Cement Systems: From Cement Paste to Commercial Products

The Influence of CO2 Curing on the Mechanical Performance and the Corresponding Chloride Ion Resistance of Alkali-Activated Compound Mineral Admixtures

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