Phase Assemblages in Hydrated Portland Cement, Calcined Clay and Limestone Blends From Solid-State 27Al and 29Si MAS NMR, XRD, and Thermodynamic Modeling

Dai, Zhuo; Kunther, Wolfgang; Ferreiro, S.; Herfort, Duncan

doi:10.1007/978-94-017-9939-3_14

Cited by 3 publications

(1 citation statement)

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“…The general phase assemblage of a binder hardly differs by the use of calcined clays after 180 d [36]. In pure Portland cement systems, accelerated ettringite formation is followed by a further reaction to monosulfate (AFm-MS) after reaching the maximum ettringite content during the main reaction of the cement clinker [37].…”

Section: Reaction Kinetics and Phase Formationmentioning

confidence: 99%

1:1 or 2:1 ‐ Does it matter for calcined clay as supplementary cementitious material?

Thienel,

Scherb,

Beuntner

et al. 2023

ce papers

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Calcined clays are the most promising future supplementary cementitious material which are capable of replacing fly ashes and blast furnace slag on the long run due to their potential to achieve high cement replacement levels and their global availability. In the last decade most research has focused on calcined clays rich in the 1:1 kaolinite. Clay with less than 20 to 25 % kaolinite were seen as worthless. Even the content of 2:1 phyllosilicates in the kaolinitic clays was neglected and not even mentioned although especially these clays are dominant in areas like central and northern Europe. Here, highly kaolinitic clays are rare or used by other industries leading to high prices. This paper is based on published works and highlights whether information obtained for calcined 1:1 dominated clays can be applied for calcined 2:1 dominated clays or not and where further research is needed.

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Section: Reaction Kinetics and Phase Formationmentioning

confidence: 99%