RT Conference Proceedings
T1 Synchrotron X-ray pair distribution function analysis of calcium silicate pastes
A1 Cuesta-García, Ana María
A1 Gómez-de-la-Torre, María de los  Ángeles
A1 García-Aranda, Miguel Ángel
K1 Materiales de construcción - Estudios, ensayos, conferencias, etc.
K1 Cemento - Estudios, ensayos, conferencias, etc.
AB The analysis of nanocrystalline and amorphous phases in cement matrices whichcontain high amounts of crystalline phases is a very challenging task. In this respect,pair distribution function (PDF) methodology in combination with synchrotron radiationis very useful to characterize cement pastes. PDF data can give insight about theatomic local structure of the non-crystalline components such as C-(A)-S-H gels. Thiswork is focused on the characterization of amorphous and nanocrystalline gels whichare present in cement related pastes by total scattering PDF analyses in selectedsamples. In addition, the PDF approach also allows us to perform quantitative analysisin order to know the nanocrystalline and microcrystalline contents. [1]X-ray scattering data of different pastes were collected in BL04-MSPD beamline atALBA Synchrotron (Barcelona, Spain). Three sets of hydrated samples have beenstudied and they will be reported: (i) tricalcium silicate, Ca3SiO5, the main component ofPortland cements; (ii) dicalcium silicate, Ca2SiO4, the main component of belitecements; and (iii) tricalcium silicate samples mixed with different amounts of silica fume(as the simplest example of supplementary cementitious materials). For all the PDFanalyses, a multi r-range approach was followed (see Figure below): the higher r-range(e.g. 40-80 Å) is used to determine the microcrystalline phase contents, for instance,portlandite and anhydrous phases; then, the intermedium r-range allows characterizingthe atomic ordering in the nanocrystalline fraction of the C-S-H gel (e.g. 10-40 Å); andfinally, the low r-range, below 10 Å, gives information about the chemical nature of theadditional amorphous components [2].
YR 2021
FD 2021
LK https://hdl.handle.net/10630/21222
UL https://hdl.handle.net/10630/21222
LA eng
NO This work has been supported by PID2019-104378RJ-I00 research grant 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 20 ene 2026