RT Conference Proceedings
T1 Ptychographic X-ray computed tomography analysis of cement pastes
A1 García-Aranda, Miguel Ángel
A1 Cuesta-García, Ana María
A1 Gómez-de-la-Torre, María de los  Ángeles
A1 Trtik, Pavel
A1 Díaz, Ana
K1 Cemento
K1 Tomografía de emisión
K1 Rayos X
AB Ptychographic  X-ray  computed  tomography  provides  3D  electron  mass  density  and  attenuationcoefficient distributions of unaltered cement pastes with an isotropic resolution below 100 nm. Thisimaging technique allows quantitatively distinguishing between different components with very similarabsorption contrast.Samples were measured at the cSAXS beamline: i) a neat Portland Cement (PC); ii) a PC-CC blend:80 wt% of PC and 20 wt% of CaCO3, and iii) a PC-FA blend: 70 wt% of PC and 30 wt% of fly ash. Themain  aim  of  this  study  is  to  have  a  better  insight  of  the  microstructure  of  theamorphous/nanocrystalline  gels  with  submicrometer  spatial  resolution.  It  is  worth  noting  that  it  ispossible to determine the gel mass density and water content within the attained 3D resolution (about100 nm). Here, we focused on the spatial distribution of the different components and in the variation of theelectron density values which are very related to the mass density values. Special attention is paid tothe density values of the amorphous (or nanocrystalline) components. The electron and mass densityvalues of the C-S-H gel for three pastes are thoroughly analyzed. The density values range from 2.05-2.10 g·cm-3 for high density C-S-H gel for neat PC and PC-CC pastes to 1.80 g.cm-3 for low densityC-S-H  gel  in  PC-FA  paste.  The  density  value  of  poorly  crystalline  iron-siliceous  hydrogarnetcomponent, d=2.52 g·cm-3, has also been determined.A summary of our ongoing research focused on the analyses of cement pastes by synchrotron PXCTis reported and discussed
YR 2019
FD 2019-10-04
LK https://hdl.handle.net/10630/18525
UL https://hdl.handle.net/10630/18525
LA eng
NO BIA2014-57658-C2-1-R and BIA2017-82391-R, which is co-funded by FEDER. Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 2 mar 2026