Influence of particle sizes of individual minerals on the hydration processes in the system C2S-C4A3S-CS

Sahu, Sadananda; Tomková, Václava; Majling, J.; Havlica, Jaromír

doi:10.1016/0008-8846(93)90020-a

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…The sample with a molar ratio of 1:2 showed some traces of gypsum, as the reaction of ye'elimite was not complete after 72 h of hydration. In the ternary system C 4 A 3 S � -C 2 S-CS � -H 2 O several datasets are shown in Figure 3, which were obtained either on pure phases [8,9,11] or on commercial CSA cements [29,30]. The reaction degrees of the clinker phases and of the calcium sulfate added were considered as far as reported.…”

Section: Comparison To Experimental Datamentioning

confidence: 99%

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Phase equilibria in the system Ca4Al6O12SO4 – Ca2SiO4 – CaSO4 – H2O referring to the hydration of calcium sulfoaluminate cements

Winnefeld

Lothenbach

2016

RILEM Tech Lett

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This paper presents thermodynamic calculations of the stable hydrate assemblages in calcium sulfoaluminate cements containing different amounts of ye'elemite, calcium sulfate and belite. The ternary diagrams developed in this paper can be used directly to assess the long-term composition of such calcium sulfoaluminate cements containing belite. The phase diagram was validated using experimental data from literature. The ternary diagrams developed can be used to read out directly the stable hydrate assemblage of calcium sulfoaluminate cements containing belite based on their initial composition.

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Section: Comparison To Experimental Datamentioning

confidence: 99%

“…Upon complete hydration, some monosulfate and strätlingite could be expected. Sahu et al [9] investigated a system with much more anhydrite (20% ye'elimite, 45% belite and 35% anhydrite). They observed ettringite and some traces of gypsum, which agrees with the predicted phase assemblage.…”

Section: Comparison To Experimental Datamentioning

confidence: 99%

Phase equilibria in the system Ca4Al6O12SO4 – Ca2SiO4 – CaSO4 – H2O referring to the hydration of calcium sulfoaluminate cements

Winnefeld

Lothenbach

2016

RILEM Tech Lett

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“…While the application of additional high shear mixing is capable of regaining normal consistency, during early crystal precipitation an appreciable development of gypsum was not observed. Despite the observation of a well dispersed, fine-grained CS within the cement it is suggested that the similarly fine-grained structure of C 4 A 3 S and C 2 S do not allow for oversaturation of calcium and sulfate ions in the liquid phase alone, which might otherwise promote gypsum crystallization [34]. For the experimental cement investigated here, it is strongly suggested that hydration of anhydrite to gypsum is at most a transitory precursor to the ettringite formation observed such that gypsum formation is not the cause of stiffening.…”

Section: Early Hydration: Dissolution and Precipitationmentioning

confidence: 94%

The impact of intrinsic anhydrite in an experimental calcium sulfoaluminate cement from a novel, carbon-minimized production process

et al. 2017

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Calcium sulfoaluminate clinker produced through a previously described novel production process, generating further economies of carbon emission minimization and sulfur use efficiency, is tested for performance as a cementitious binder. The reactivity levels of major phases, including ye'elimite, two polymorphs of belite and anhydrite are found to produce a viable product characterized by rapid hydration. Through investigation, the reactivity is linked to the unique distribution of crystalline phases present within cement grains. It is inferred that both microstructure and mineralogy are responsible for the undesirable set behaviour encountered. The causality of this problem is further investigated and determined to be a consequence of the intrinsic anhydrite component for which remediation solutions are described. The resultant mortar compression strengths are determined for the subject cement in order to characterize its potential in relation to ordinary Portland cement.

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“…It is reported that 3CaO•A 2 O 3 reacted with anhydrite to form a small amount of ye'elimite when the temperature reaches 1250°C [32]. According to the XRD, 3CaO•A 2 O 3 in the raw material gradually disappeared with the increase of holding temperature [34].…”

Section: Xrd and Tg-dtamentioning

confidence: 97%

Preparation and Performance of Ternesite-Ye’Elimite Clinker Produced from Steel Slag at Lower Temperature

Li¹,

Guo²,

Hu³

et al. 2022

Journal of Renewable Materials

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Ternesite (4CaO•2SiO 2 •CaSO 4 )-Ye'elimite (3CaO•3Al 2 O 3 •CaSO 4 ) (simplified as TY) cement clinker was successfully prepared from steel slag at 1200°C in this study. XRD, TG/DSC and SEM were used to analyze the mineral composition and hydration products of the TY clinker. The sintering process and hydration mechanism of the TY clinker were investigated. Results show that a large amount of ternesite and ye'elimite have been formed at 1200°C, while ternesite has not been decomposed. Clinker minerals include ternesite, ye'elimite, gypsum and a small amount of iron phase. Iron phase from steel slag can promote the formation of liquid phase with the presence of gypsum at 1200°C and thus lead to the coexistence of ternesite and ye'elimite. The compressive strength of TY cement cured at 28 d is 59.5 MPa, which is higher than that of P. II 42.5 cement. This research provides a sustainable and energy-effective way for the reutilization of steel slag, an otherwise valueless waste.

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Influence of particle sizes of individual minerals on the hydration processes in the system C2S-C4A3S-CS

Cited by 7 publications

References 3 publications

Phase equilibria in the system Ca<sub>4</sub>Al<sub>6</sub>O<sub>12</sub>SO<sub>4</sub> – Ca<sub>2</sub>SiO<sub>4</sub> – CaSO<sub>4</sub> – H<sub>2</sub>O referring to the hydration of calcium sulfoaluminate cements

Phase equilibria in the system Ca<sub>4</sub>Al<sub>6</sub>O<sub>12</sub>SO<sub>4</sub> – Ca<sub>2</sub>SiO<sub>4</sub> – CaSO<sub>4</sub> – H<sub>2</sub>O referring to the hydration of calcium sulfoaluminate cements

The impact of intrinsic anhydrite in an experimental calcium sulfoaluminate cement from a novel, carbon-minimized production process

Preparation and Performance of Ternesite-Ye’Elimite Clinker Produced from Steel Slag at Lower Temperature

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