Characterization of aqueous carbonated cement-based materials by multinuclear solid-state NMR spectroscopy
Year: 2025
Type: article
Abstract: Solid-state nuclear magnetic resonance (NMR) spectroscopy is a versatile characterization technique to investigate complex systems such as cement-based materials. This work summarizes recent advances in the application of solid-state NMR spectroscopy for analyzing carbonation processes of cement-based materials on an atomistic level. 29Si MAS NMR can probe the progressive decalcification and subsequent decomposition of the C-(A)-S-H phase as well as the formation of the alumina-silica gel. Detailed structural information about the alumina-silica gel can be achieved from 27Al and 29Si NMR, where the present work focusses particularly on the early-stage structure of this phase, exhibiting a higher Al/Si ratio and hydroxylated AlO4 sites. It is also shown that a quantification of carbonate phases can be obtained by 13C MAS NMR, whereas 13C{1H} cross-polarization (CP) NMR measurements allow identification of hydrous carbonate sites. Insights about the reactivity and thermal stability of the carbonation products are also provided by 29Si and 27Al MAS NMR.
Authors: Fábio Maia Neto, Jørgen Skibsted
Institution: Aarhus University
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Awards: G1283723606, G257174911, G3026553075
OpenAlex ID: W4410092853