Hindered water motions in hardened cement pastes investigated over broad time and length scales.

Simple item page
dc.contributor.authorBordallo, HNen_AU
dc.contributor.authorAldridge, LPen_AU
dc.contributor.authorFouquet, Pen_AU
dc.contributor.authorPardo, LCen_AU
dc.contributor.authorUnruh, Ten_AU
dc.contributor.authorWuttke, Jen_AU
dc.contributor.authorYokaichiya, Fen_AU
dc.date.accessioned2011-04-04T23:14:39Zen_AU
dc.date.available2011-04-04T23:14:39Zen_AU
dc.date.issued2009-10-28en_AU
dc.date.statistics2009-10-28en_AU
dc.description.abstractWe investigated the dynamics of confined water in different hydrated cement pastes with minimized contributions of capillary water. It was found that the water motions are extremely reduced compared to those of bulk water. The onset of water mobility, which was modified by the local environment, was investigated with elastic temperature scans using the high-resolution neutron backscattering instrument SPHERES. Using a Cauchy−Lorenz distribution, the quasi-elastic signal observed in the spectra obtained by the backscattering spectrometer was analyzed, leading to the identification of rotational motions with relaxation times of 0.3 ns. Additionally, neutron spin echo (NSE) spectroscopy was used to measure the water diffusion over the local network of pores. The motions observed in the NSE time scale were characterized by diffusion constants ranging from 0.6 to 1.1 × 10−9 m2 s−1 most likely related to water molecules removed from the interface. In summary, our results indicate that the local diffusion observed in the gel pores of hardened cement pastes is on the order of that found in deeply supercooled water. Finally, the importance of the magnetic properties of cement pastes were discussed in relation to the observation of a quasi-elastic signal on the dried sample spectra measured using the time-of-flight spectrometer. © 2009, American Chemical Societyen_AU
dc.identifier.citationBordallo, H. N., Aldridge, L. P., Fouquet, P., Pardo, C., Unruh, T., Wuttke, J., & Yokaichiya, F. (2009). Hindered water motions in hardened cement pastes investigated over broad time and length scales. ACS Applied Materials & Interfaces, 1(10), 2154-2162. doi:10.1021/am900332nen_AU
dc.identifier.govdoc3343en_AU
dc.identifier.issn1944-8244en_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleACS Applied Materials & Interfacesen_AU
dc.identifier.pagination2154-2162en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/am900332nen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3556en_AU
dc.identifier.volume1en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectCementsen_AU
dc.subjectPore structureen_AU
dc.subjectScatteringen_AU
dc.subjectWateren_AU
dc.subjectMagnetic propertiesen_AU
dc.subjectDiffusionen_AU
dc.titleHindered water motions in hardened cement pastes investigated over broad time and length scales.en_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Journal Articles