Small angle neutron scattering as well as pore solution investigations of cement

Title: Small angle neutron scattering as well as pore solution investigations of cement
Author(s): J. Tritthart, F. Häußler
Paper category : conference
Book title: International RILEM Workshop on Frost Resistance of Concrete
Editor(s): M. J. Setzer, R. Auberg and H. - J. Keck
Print-ISBN: 2-912143-30-6
e-ISBN: 2351580370
Publisher: RILEM Publications SARL
Publication year: 2002
Pages: 69 - 79
Total Pages: 11
Nb references: 20
Language: English

Abstract: Pore solution investigations of cement pastes which had been prepared with the addition of amino-alcohol showed that the amino-alcohol had not been bound by cement during hydration and remained more or less completely dissolved in the capillary water, which can (theoretically) be expressed. This suggests that no significant binding of amino-alco-hol had occurred, neither chemically nor by way of adsorption and that the physically bound water (gel water) could not act as a solvent for the amino-alcohol. The latter seems to be in contrast to the frost theory according to which a part of the gel water is mobile [1]. This shows that a better understanding of structural details in the nm range of hardened cement is necessary. Therefore, small angel neutron scattering (SANS) experiments were performed to study this part of the structure using an OPC and C3S. SANS studies allow a non-destructive description of statistically representative micro-structures in the scale range from µm to nm. In contrast to the established methods for microstructural investigations like MIP or BET, non-dried samples can be used. More-over, the scattering signals can be analyzed in a variety of ways, and therefore a more detailed insight into the very complex cement paste microstructure can be given. In this study the signals were evaluated with respect to the specific inner surface and the parti-cle size distribution in the investigated nm-range up to ~100 nm.

Online publication: 2010-06-28
Publication type : full_text
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