Rietveld quantitative phase analysis of Yeelimite-containing cements

Álvarez-Pinazo, Gema; Cuesta, Ana; García-Maté, Marta; Santacruz, Isabel; Losilla, Enrique R.; Torre, Ángeles G. De la; León‐Reina, Laura; Aranda, Miguel A. G.

doi:10.1016/j.cemconres.2012.03.018

Cited by 203 publications

(74 citation statements)

References 56 publications

(59 reference statements)

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“…15 Furthermore, this phase is commonly the second most abundant constituent of OPC. Stoichiometric C 2 S exhibits five polymorphs at ordinary pressure 16,17 when is heated (, , ' L , ' H and ) and its temperature evolution is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of stabilization of dicalcium silicate solid solution with aluminium

et al. 2014

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KEYWORDS: PC-SOFC, Mixed oxide and proton conductor, aluminum doped dicalcium silicate ABSTRACT:Stoichiometric dicalcium silicate, Ca 2 SiO 4 , displays a well-known polymorphism with temperature.When this phase is doped by a range of elements generates belite, one of the main phases of cements. Here, we thoroughly study the aluminum doping of dicalcium silicate. This type of study is important for cement characterization and also from a basic point of view.

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Section: Introductionmentioning

confidence: 99%

Mechanism of stabilization of dicalcium silicate solid solution with aluminium

et al. 2014

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“…The ACn content of this CSA cement,~15 wt.%, is slightly higher than that found for OPC cements,~10 wt.% [41,42], likely due to the lower clinkering temperature leading to smaller particle sizes and microstrains and defects-bearing crystals. The crystal structure descriptions for each phase were those detailed elsewhere [15], except for ye'elimite, where a reviewed orthorhombic C 4 A 3 S has been used [43]. The ACn content in FA is~85 wt.%, where mullite and quartz and some other crystalline minor phases (hematites, magnesium-ferrite, lime and periclase) are also present as crystalline fraction.…”

Section: Compressive Strengthsmentioning

confidence: 99%

“…Early hydration of CSA cements [12,13] gives ettringite also named as AFt (C 6 AS 3 H 32 ), and monosulfate also known as AFm (C 4 ASH 12 ) [14], as main crystalline phases, depending mainly upon the sulfate availability. CSA binders may show variable compositions, but all of them contain ye'elimite, also called Klein's salt or tetracalcium trialuminate sulfate (C 4 A 3 S) [1,15]. Ye'elimite synthesis produces only a third part of the CO 2 released by the production of alite content in OPCs [16].…”

Section: Introductionmentioning

confidence: 99%

Hydration studies of calcium sulfoaluminate cements blended with fly ash

García-Maté

Torre

León‐Reina

et al. 2013

Cement and Concrete Research

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169

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The main objective of this work is to study the hydration and properties of calcium sulfoaluminate cement pastes blended with fly ash (FA) and the corresponding mortars at different hydration ages. Laboratory X-ray powder diffraction, rheological studies, thermal analysis, porosimetry and compressive strength measurements were performed. The analysis of the diffraction data by Rietveld method allowed quantifying crystalline phases and overall amorphous contents. The studied parameters were: i) FA content, 0, 15 and 30 wt.%; and ii) water addition, water-to-CSA mass ratio (w/CSA = 0.50 and 0.65), and water-to-binder mass ratio (w/b = 0.50). Finally, compressive strengths after 6 months of 0 and 15 wt.% FA [w/CSA = 0.50] mortars were similar: 73 ± 2 and 72 ± 3 MPa, respectively. This is justified by the filler effect of the FA as no strong evidences of reactivity of FA with CSA were observed. These results support the partial substitution of CSA cements with FA with the economic and environmental benefits.

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“…The iron content of ye'elimite in these industrially produced clinkers was analyzed and it resulted relatively low 24,25 . In a recent work 22 , orthorhombic and cubic ye'elimite polymorphs were observed to occur in BCSA clinkers doped with B 3+ and Na + .…”

Section: Introductionmentioning

confidence: 99%

“…The overall CO 2 emission reduction can amount up to 40%. 21 The effect of iron in the formation of ye'elimite in belite calcium sulfoaluminate clinkers has been also studied 22,23 . The iron content of ye'elimite in these industrially produced clinkers was analyzed and it resulted relatively low 24,25 .…”

Section: Introductionmentioning

confidence: 99%

Pseudocubic Crystal Structure and Phase Transition in Doped Ye’elimite

Cuesta

Torre

Losilla

et al. 2014

Crystal Growth & Design

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Sodalites are tridimensional alumino-silicate materials containing cages where loosely bonded anions are located. Ye'elimite, Ca 4 [Al 6 O 12 ]SO 4 , is outstanding as an aluminate sodalite with a flexible framework accepting several type of dopants with important structural consequences. Moreover, ye'elimite is also important from an applied perspective as it is the most relevant phase in calcium sulfoaluminate cements. The crystal structure of stoichiometric ye'elimite has recently been unraveled but the structure of dopant-containing ye'elimite, which is presents in cements, is not well studied. Here, we report the pseudo-cubic crystal structure of doped ye'elimite, Ca 3.8 Na 0.2 Al 5.6 Fe 0.2 Si 0.2 O 12 SO 4 , from high-resolution synchrotron powder diffraction data. The powder pattern is indexed with a cubic cell and a structural model is reported based on the I4 ̅ 3m space group. However, this compound displays diffraction peak narrowing on heating. Furthermore, some high-angle split peaks become single peak on heating and a phase transition is measured at 525ºC. Therefore, it is concluded that the crystal structure at room temperature has lower symmetry although it can be described as cubic. The structural study at 800ºC suggests a truly cubic structure and we speculate that this phase transition, on heating, is likely related with the dynamical disordering of the sulfate anions. Finally it is concluded that the high temperature cubic state was not quenchable to ambient, even when the tested chemical substituents are introduced into the structure.

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Rietveld quantitative phase analysis of Yeelimite-containing cements

Cited by 203 publications

References 56 publications

Mechanism of stabilization of dicalcium silicate solid solution with aluminium

Mechanism of stabilization of dicalcium silicate solid solution with aluminium

Hydration studies of calcium sulfoaluminate cements blended with fly ash

Pseudocubic Crystal Structure and Phase Transition in Doped Ye’elimite

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