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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1107/S0909049511005796
|2 doi
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|e rakwb
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|a eng
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|a De la Torre, Angeles G
|e verfasserin
|4 aut
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|a In situ powder diffraction study of belite sulfoaluminate clinkering
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|c 2011
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|a Text
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|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 16.08.2011
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|a Date Revised 28.04.2011
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Belite sulfoaluminate (BSA) cements have been proposed as environmentally friendly building materials, as their production may release up to 35% less CO(2) into the atmosphere when compared with ordinary Portland cement fabrication. However, their formation mechanism has not been studied in detail so far. Here, an in situ high-temperature high-resolution synchrotron X-ray powder diffraction study is reported. Two types of BSA clinkers have been characterized, both containing 50-60 wt% C(2)S and 20-30 wt% C(4)A(3)\underline{\rm S} as main phases. One type is iron-rich and a second type (with different phase assemblage) is aluminium-rich. Furthermore, the C(2)S phase reacts slowly with water, thus activation of this compound is desirable in order to enhance the mechanical strength development of the resulting cements. To do so, iron-rich BSA clinkers have been doped with minor amounts of B(2)O(3) and Na(2)O to promote stabilization of α-forms of C(2)S, which are more reactive with water. The decarbonated raw materials were loaded into Pt tubes and heated to between 973 K and 1673 K, and patterns were collected using a high-energy synchrotron beam of wavelength λ = 0.30 Å. The thermal stability of Klein's salt in these clinkers has been clarified. Several reactions have been followed: formation and decomposition of Klein's salt, melting of aluminates and ferrite, and polymorphic transformations of dicalcium silicate: alpha'H-C2S → α-C(2)S. Changes in mineralogical phase assemblages at a given temperature owing to the addition of minor amounts of selected elements have also been determined
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|a Journal Article
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|a Cuberos, Antonio J M
|e verfasserin
|4 aut
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|a Alvarez-Pinazo, Gema
|e verfasserin
|4 aut
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1 |
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|a Cuesta, Ana
|e verfasserin
|4 aut
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|a Aranda, Miguel A G
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of synchrotron radiation
|d 1994
|g 18(2011), Pt 3 vom: 18. Mai, Seite 506-14
|w (DE-627)NLM09824129X
|x 1600-5775
|7 nnas
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| 773 |
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|g volume:18
|g year:2011
|g number:Pt 3
|g day:18
|g month:05
|g pages:506-14
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|u http://dx.doi.org/10.1107/S0909049511005796
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