RT Journal Article
T1 X-ray near-field ptychographic nanoimaging of cement pastes
A1 Shirani, Shiva
A1 Cuesta, Ana
A1 Santacruz-Cruz, María Isabel
A1 Torre, Ángeles G. de la
A1 Díaz, Ana
A1 Trtik, Pavel
A1 Holler, Mirko
A1 García-Aranda, Miguel Ángel
K1 Cemento Portland
K1 Tomografía
K1 Cristalografía por rayos X
K1 Química inorgánica
AB The hydration processes of Portland cements (PC) and blends are complicated as there are many components with great heterogeneity at different length scales. Thus, 3D nanoimaging techniques with high spatial resolution and scanning large fields of view are needed. Here, synchrotron X-ray near-field ptychographic tomography is used to investigate four pastes within 0.2 mm thick capillaries: PC with CaCl2, PC hydration enhanced by C-S-H nucleation seeding, PC partly substituted with metakaolin, and PC partly substituted with metakaolin and limestone. Data analysis emphasis has been placed on the characterization of amorphous components: (i) C-S-H and C-A-S-H gels; (ii) iron aluminium siliceous hydrogarnets; (iii) metakaolin; and (iv) aluminium carboaluminate, AFm-like. Synchrotron ptychotomography yields electron density and absorption coefficient tomograms and the resulting bivariate plots are instrumental for characterising these amorphous components. The attained spatial resolution, ∼220 nm, with very good contrast allowed us to determine nanofeatures including mass densities and spatial distributions of amorphous components. For instance, the C-S-H gel mass density differences between the two type of accelerated pastes are detailed.
PB Elsevier
YR 2024
FD 2024
LK https://hdl.handle.net/10630/32476
UL https://hdl.handle.net/10630/32476
LA eng
NO Shiva Shirani, Ana Cuesta, Isabel Santacruz, Angeles G. De la Torre, Ana Diaz, Pavel Trtik, Mirko Holler, Miguel A.G. Aranda, X-ray near-field ptychographic nanoimaging of cement pastes, Cement and Concrete Research, Volume 185, 2024, 107622, ISSN 0008-8846, https://doi.org/10.1016/j.cemconres.2024.107622
NO Funding for open access charge: Universidad de Málaga / CBUA. This research has been partly supported by the research grant PID2019-104378RJ-I00 which is co-funded by ERDF. We acknowledge the Paul Scherrer Institut, Villigen, Switzerland for provision of synchrotron radiation beamtime at cSAXS beamline of the SLS, proposal number 20210147.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026