Aluminum-rich belite sulfoaluminate cements: Clinkering and early age hydration

Martín-Sedeño, M.C.; Cuberos, Antonio J. M.; Torre, Ángeles G. De la; Álvarez-Pinazo, Gema; Ordónez, Luis M.; Gateshki, Milen; Aranda, Miguel A. G.

doi:10.1016/j.cemconres.2009.11.003

Cited by 134 publications

(63 citation statements)

References 54 publications

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“…More recently, this has been expanded to hydrated cementitious systems [3][4][5]13] and in some of them, the non diffracting fraction, also named as Amorphous and Crystalline notquantified, ACn [29], was also calculated [30,31]. Furthermore, the use of an intense X-ray source, such as synchrotron X-rays, coupled with a fast X-ray detector permits time-resolved diffraction experiments allowing in-situ measurements during the hydration process of cements [4,5,13,14,32,33].…”

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confidence: 99%

“…Most of the hydration heat is released within the first 12-24 h of hydration [11,16,17]. The Cement and Concrete Research 56 (2014) [12][13][14][15][16][17][18][19] water demand needed for a complete hydration process is determined by the amount of calcium sulfate and silicates. The required water/ cement ratio is slightly higher than that for OPC (for complete hydration).…”

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confidence: 99%

“…They are prepared by mixing the clinker with different amounts of a calcium sulfate set regulator such as gypsum, bassanite or anhydrite. Hereafter cement nomenclature will be used: C = CaO, S = SiO 2 , A = Al 2 O 3 , F = Fe 2 O 3 , S = SO 3 , T = TiO 2 and H = H 2 O. BCSA cements are based on belite (C 2 S), ye'elimite (also called Klein's salt or tetracalcium trialuminate sulfate (C 4 A 3 S)) and other minor phases, such as ferrite (C 4 AF) [9][10][11][12][13] or calcium aluminates (C 12 A 7 ) [14] and calcium sulfate (CSH x ) as set retarder. The hydration of BCSA cements strongly depends on the amount and reactivity of the added calcium sulfate [15] and the presence of minor phases.…”

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confidence: 99%

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In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction

Álvarez-Pinazo

Cuesta

García-Maté

et al. 2014

Cement and Concrete Research

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Eco-friendly belite calcium sulfoaluminate (BCSA) cement hydration behavior is not yet well understood. Here, we report an in-situ synchrotron X-ray powder diffraction study for the first hours of hydration of BCSA cements. Rietveld quantitative phase analysis has been used to establish the degree of reaction (α). The hydration of a mixture of ye'elimite and gypsum revealed that ettringite formation (α~70% at 50 h) is limited by ye'elimite dissolution. Two laboratory-prepared BCSA cements were also studied: non-active-BCSA and active-BCSA cements, with β-and α′ H -belite as main phases, respectively. Ye'elimite, in the non-active-BCSA system, dissolves at higher pace (α~25% at 1 h) than in the active-BCSA one (α~10% at 1 h), with differences in the crystallization of ettringite (α~30% and α~5%, respectively). This behavior has strongly affected subsequent belite and ferrite reactivities, yielding stratlingite and other layered phases in non-active-BCSA. The dissolution and crystallization processes are reported and discussed in detail.

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In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction

Álvarez-Pinazo

Cuesta

García-Maté

et al. 2014

Cement and Concrete Research

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“…A similar experimental set-up and analysis methodology were followed to study the hydration of belite and active belite cements. [68] The hydration of eco-cements, including phase content evolution by Rietveld methodology, has also been analysed for aluminium-rich belite sulphoaluminate cements, [69] active sulphobelite cements [70] and active sulphobelite cements at very early ages. [71] SXRPD coupled with the Rietveld method can also be used to characterize the long-term leaching behaviour of concretes by quantifying portlandite dissolution at different hydration times.…”

Section: Quantitative Phase Analysis Of Anhydrous Building Materialsmentioning

confidence: 99%

Recent studies of cements and concretes by synchrotron radiation crystallographic and cognate methods

Aranda

2015

Crystallography Reviews

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The portfolio of available synchrotron radiation techniques is increasing notably for cements and pastes. Furthermore, sometimes the terminology is confusing and an overall picture highlighting similarities and differences of related techniques was lacking. Therefore, the main objective of this work is to review recent advances in synchrotron techniques providing a comprehensive overview. This work is not intended to gather all publications in cement chemistry but to give a unified picture through selected examples. Crystallographic techniques are used for structure determination, quantitative phase analyses and microstructure characterization. These studies are not only carried out in standard conditions but synchrotron techniques are especially suited to non-ambient conditions: high temperatures and pressures, hydration, etc., and combinations. Related crystallographic techniques, like Pair Distribution Function, are being used for the analysis of ill-crystalline phase(s). Furthermore, crystallographic tools are also employed in imaging techniques including scanning diffraction microscopy and tomography and coherent diffraction imaging. Other synchrotron techniques are also reviewed including X-rays absorption spectroscopy for local structure and speciation characterizations; small angle X-ray scattering for microstructure analysis and several imaging techniques for microstructure quantification: full-field soft and hard X-ray nano-tomographies; scanning infrared spectro-microscopy; scanning transmission and fluorescence X-ray tomographies. Finally, a personal outlook is provided.

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“…0.97 tons of CO 2 to produce per ton of PC are released into atmosphere: 0.54 tons of CO 2 from decomposition of calcite in the kilns, and on average, 0.34 and 0.09 tons of CO 2 from the burning of the fuel and electricity for the milling, respectively [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

HYDRATING CHARACTERISTICS OF MODIFIED PORTLAND WITH Ba-BEARING SULPHOALUMINATE MINERALS

Wang¹,

Gong²,

Jibao³

et al. 2016

Ceramics - Silikaty

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Aluminum-rich belite sulfoaluminate cements: Clinkering and early age hydration

Cited by 134 publications

References 54 publications

In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction

In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction

Recent studies of cements and concretes by synchrotron radiation crystallographic and cognate methods

HYDRATING CHARACTERISTICS OF MODIFIED PORTLAND WITH Ba-BEARING SULPHOALUMINATE MINERALS

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