SMALL ANGLE NEUTRON SCATTERING AS WELL AS PORE SOLUTION INVESTIGATIONS OF CEMENT

摘要

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 mat no significant binding of amino-alcohol 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. 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 C_3S. 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. Moreover, 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 particle size distribution in the investigated nm-range up to ～100 nm.