Hindered Water Motions in Hardened Cement Pastes Investigated over Broad Time and Length Scales

Bordallo HN, Aldridge LP, Fouquet P, Pardo LC, Unruh T, Wuttke J, Yokaichiya F (2009)

Publication Status: Published

Publication Type: Journal article

Publication year: 2009

Journal

ACS Applied Materials and Interfaces American Chemical Society

Publisher: AMER CHEMICAL SOC

Book Volume: 1

Pages Range: 2154-2162

Journal Issue: 10

DOI: 10.1021/am900332n

Abstract

We investigated the dynamics of confined water indifferent 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 x 10(-9) m(2) 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

Authors with CRIS profile

Tobias Unruh Professur für Nanomaterialcharakterisierung (Streumethoden)

Involved external institutions

Niels Bohr Institute / Niels Bohr Institutet DK Denmark (DK) Australian Nuclear Science and Technology Organisation (ANSTO) AU Australia (AU) Institute Laue-Langevin (ILL) FR France (FR) Polytechnic University of Catalonia / Universitat Politècnica de Catalunya ES Spain (ES) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE) Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) DE Germany (DE)

How to cite

APA:

Bordallo, H.N., Aldridge, L.P., Fouquet, P., Pardo, L.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 and Interfaces, 1(10), 2154-2162. https://dx.doi.org/10.1021/am900332n

MLA:

Bordallo, Heloisa Nunes, et al. "Hindered Water Motions in Hardened Cement Pastes Investigated over Broad Time and Length Scales." ACS Applied Materials and Interfaces 1.10 (2009): 2154-2162.

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