Deciphering mineralogical changes and carbonation development during hydration and ageing of a consolidated ternary blended cement paste

IUCrJ
Francis ClaretJonathan Wright

Abstract

To understand the main properties of cement, a ubiquitous material, a sound description of its chemistry and mineralogy, including its reactivity in aggressive environments and its mechanical properties, is vital. In particular, the porosity distribution and associated sample carbonation, both of which affect cement's properties and durability, should be quantified accurately, and their kinetics and mechanisms of formation known both in detail and in situ. However, traditional methods of cement mineralogy analysis (e.g. chemical mapping) involve sample preparation (e.g. slicing) that can be destructive and/or expose cement to the atmosphere, leading to preparation artefacts (e.g. dehydration). In addition, the kinetics of mineralogical development during hydration, and associated porosity development, cannot be examined. To circumvent these issues, X-ray diffraction computed tomography (XRD-CT) has been used. This allowed the mineralogy of ternary blended cement composed of clinker, fly ash and blast furnace slag to be deciphered. Consistent with previous results obtained for both powdered samples and dilute systems, it was possible, using a consolidated cement paste (with a water-to-solid ratio akin to that used in civil engin...Continue Reading

References

Apr 22, 2008·Nature Materials·Pierre BleuetPhilippe Walter
Aug 7, 2013·Environmental Science & Technology·Encarnación Ruiz-AgudoCarlos Rodriguez-Navarro
Sep 24, 2013·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Sylvain GrangeonChristophe Chiaberge
Sep 25, 2014·Nature Communications·M J Abdolhosseini QomiR J-M Pellenq
Feb 10, 2016·Proceedings of the National Academy of Sciences of the United States of America·Katerina IoannidouEmanuela Del Gado
Jul 8, 2017·Accounts of Chemical Research·Young-Shin JunQingyun Li

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Methods Mentioned

BETA
X-ray
PCA

Software Mentioned

PyMCA

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