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

Journal Article · · IUCrJ
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2];  [3];  [3];  [1]; ORCiD logo [1]; ORCiD logo [4];  [4]; ORCiD logo [5]; ORCiD logo [3]
  1. BRGM (French Geological Survey), Orleans (France)
  2. BRGM (French Geological Survey), Orleans (France); Univ. d'Orleans (France). CNRS/INSU-BRGM. Inst. des Sciences de la Terre d'Orleans; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Geoscience Division
  3. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  4. Andra, Centre de Meuse/Haute Marne, Bure (France)
  5. Univ. of Grenoble Alpes (France). CNRS. ISTerre

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 andin 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 engineering), to determine that the mineralogy consists of alite (only detected in thein situhydration experiment), calcite, calcium silicate hydrates (C-S-H), ettringite, mullite, portlandite, and an amorphous fraction of unreacted slag and fly ash. Mineralogical evolution during the first hydration steps indicated fast ferrite reactivity. Insights were also gained into how the cement porosity evolves over time and into associated spatially and time-resolved carbonation mechanisms. It was observed that macroporosity developed in less than 30 h of hydration, with pore sizes reaching about 100–150 µm in width. Carbonation was not observed for this time scale, but was found to affect the first 100 µm of cement located around macropores in a sample cured for six months. Regarding this carbonation, the only mineral detected was calcite.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1625823
Journal Information:
IUCrJ, Vol. 5, Issue 2; ISSN 2052-2525
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Quantitative disentanglement of nanocrystalline phases in cement pastes by synchrotron ptychographic X-ray tomography journal April 2019
Quantitative disentanglement of nanocrystalline phases in cement pastes by synchrotron ptychographic X-ray tomography text January 2019