ISIS Neutron and Muon Source Data Journal

Resolving the manifold setting structure of protiated vs D2O portland cements

Abstract: Models of cement have been formulated to further understanding. The dominant being Jenning’s layered colloid model. Therein, idealised silicate layers are interspersed with Ca-ions and H2O to form Ca-Si-Hydrate ‘gel’ (C-S-H); comprising ~70% of the matrix and responsible for cohesion of the components and bulk mechanical properties. Jennings models have never been tested nor questioned. NMR work evidences a C-S-H distribution of Q0:Q1:Q2 as ~10:67:23. Hence, the majority of Si-atoms are terminal and bridging O-atoms in the minority, making layered and extended-silicate structures improbable. Entropy would agree.Our work on C-S-H gel showed layered structures to be the least stable in free-energy(+2.27eV). The presence/absence of layered type structures will be signaled by periodic patterns in atomic pair distribution functions. We propose measurements on NIMROD to help resolve this

Principal Investigator: Dr Gregory Chasse
Experimenter: Professor Giovanni Romanelli
Experimenter: Dr David Farrar
Experimenter: Mr Fu Song
Local Contact: Dr Tom Headen
Experimenter: Professor Neville Greaves
Experimenter: Dr Kun Tian
Experimenter: Dr Matthew Krzystyniak
Experimenter: Mr Injamam Haque
Experimenter: Mr Mohammed Salha
Experimenter: Mr Mosthak Rahat Ahmed

DOI: 10.5286/ISIS.E.RB1710444

ISIS Experiment Number: RB1710444

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Gregory Chasse et al; (2017): Resolving the manifold setting structure of protiated vs D2O portland cements, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1710444

Data is released under the CC-BY-4.0 license.