Effect of C12A7 in steel slag on the early-age hydration of cement

Zhuang, Shiyu; Wang, Qiang; Luo, Ting

doi:10.1016/j.cemconres.2022.107010

Cited by 28 publications

(4 citation statements)

References 57 publications

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“…In addition, the lower reactivity of SSP may also be related to the dense structure and larger grain size of C 3 S and β-C 2 S crystal formed at high temperature, as well as the transformation of β-C 2 S into non-hydraulic γ-C 2 S during slow cooling [1]. Zhuang et al experimentally demonstrated that the presence of C 12 A 7 in SSP (Figure 2) retards the hydration of C 3 S significantly [40]. C 12 A 7 releases abundant Al 3+ that may be adsorbed by the surface of C 3 S, accordingly, hindering the hydration of the cement [40].…”

Section: Water Requirement Soundness and Setting Timementioning

confidence: 99%

“…Zhuang et al experimentally demonstrated that the presence of C 12 A 7 in SSP (Figure 2) retards the hydration of C 3 S significantly [40]. C 12 A 7 releases abundant Al 3+ that may be adsorbed by the surface of C 3 S, accordingly, hindering the hydration of the cement [40]. The initial setting time is a key criterion determining the pre-curing time of steam curing [41].…”

Section: Water Requirement Soundness and Setting Timementioning

confidence: 99%

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The Early Age Hydration Products and Mechanical Properties of Cement Paste with Steel Slag Powder as Additive under Steam Curing Conditions

Li,

Lu,

Huo

et al. 2023

Buildings

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To explore the feasibility of the application of steel slag powder (SSP) in steam-cured precast concrete, 0% and 20% SSP were used to replace cement and prepare cement paste, and the early age performance of steam-cured (80 °C for 7 h and 7 d) SSP-blended cement paste, including different types and amounts of hydrates, the microstructure and mechanical properties were investigated and compared with those of 28 d standard-cured SSP sample. The results show that SSP addition promotes the generation of laminar C-S-H gels and granular C-S-H gels after an initial 7 h steam curing. Further extending the lasting time of 80 °C steam curing to 7 days favors the production of hydrogarnet and crystalline C-S-H, of which the amount of formation of hydrogarnet in SSP composite cement paste is less and the particle size is smaller than those in the control sample. However, steam curing increases the gap between the number of hydrates formed in SSP-blended cement paste and the control paste. The delayed hydration effect of SSP on cement offsets the promoting effect of steam curing on the hydration of cement; in consequence, the incorporation of SSP seems to be detrimental to the hydration of steam-cured cement paste.

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Section: Water Requirement Soundness and Setting Timementioning

confidence: 99%

Section: Water Requirement Soundness and Setting Timementioning

confidence: 99%

The Early Age Hydration Products and Mechanical Properties of Cement Paste with Steel Slag Powder as Additive under Steam Curing Conditions

Li,

Lu,

Huo

et al. 2023

Buildings

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“…The predominant form of steel slag in China is derived from the converter process, composing approximately 70% of the accumulated steel slag reserves. Steel slag contains a large amount of inactive components, mainly composed of the RO phase (MgO-FeO-MnO solid solution) [7][8][9][10][11][12][13]. Its active components, including tricalcium silicate (C 3 S), dicalcium silicate (C 2 S), calcium aluminate, and calcium iron aluminate, are similar to the active components of Portland cement clinker [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Steel slag contains a large amount of inactive components, mainly composed of the RO phase (MgO-FeO-MnO solid solution) [7][8][9][10][11][12][13]. Its active components, including tricalcium silicate (C 3 S), dicalcium silicate (C 2 S), calcium aluminate, and calcium iron aluminate, are similar to the active components of Portland cement clinker [7][8][9][10][11][12][13]. Owing to these similarities, steel slag exhibits a measure of hydraulicity, which has led to its designation as a 'substandard cement' or low-quality cement.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Preparing Steel Slag–Ground Granulated Blast Furnace Slag Cementitious Materials: Synergistic Hydration, Fresh, and Hardened Properties

Sun,

Hou,

Guo

et al. 2024

Buildings

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Steel slag and GBFS are wastes generated during the steel and iron smelting process, characterized by their considerable production rates and extensive storage capacities. After grinding, they are often used as supplementary cementitious materials. However, the intrinsic slow hydration kinetics of steel slag–GBFS cementitious material (SGM) when exposed to a pure water environment result in prolonged setting times and diminished early-age strength development. The incorporation of modifiers such as gypsum, clinker, or alkaline activators can effectively improve the various properties of SGM. This comprehensive review delves into existing research on the utilization of SGM, examining their hydration mechanisms, workability, setting time, mechanical strengths, durability, and shrinkage. Critical parameters including the performance of base materials (water-to-cement ratio, fineness, and composition) and modifiers (type, alkali content, and dosage) are scrutinized to understand their effects on the final properties of the cementitious materials. The improvement mechanisms of various modifiers on properties are discussed. This promotes resource utilization of industrial solid wastes and provides theoretical support for the engineering application of SGM.

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Hydration Activity and Carbonation of the Solid Solution of MgO-FeO-MnO-CaO System in Steel Slag

Zhang,

Liu,

Liu

2023

J. Sustain. Metall.

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Effect of C12A7 in steel slag on the early-age hydration of cement

Cited by 28 publications

References 57 publications

The Early Age Hydration Products and Mechanical Properties of Cement Paste with Steel Slag Powder as Additive under Steam Curing Conditions

The Early Age Hydration Products and Mechanical Properties of Cement Paste with Steel Slag Powder as Additive under Steam Curing Conditions

Feasibility of Preparing Steel Slag–Ground Granulated Blast Furnace Slag Cementitious Materials: Synergistic Hydration, Fresh, and Hardened Properties

Hydration Activity and Carbonation of the Solid Solution of MgO-FeO-MnO-CaO System in Steel Slag

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