RT Journal Article
T1 X-ray Total Scattering Study of Phases Formed from Cement Phases Carbonation
A1 Cuesta-García, Ana María
A1 Gómez-de-la-Torre, María de los  Ángeles
A1 García-Aranda, Miguel Ángel
K1 Materiales de construcción
K1 Análisis térmico
K1 Minerales
AB Carbonation in cement binders has to be thoroughly understood because it affects phaseassemblage, binder microstructure and durability performance of concretes. This is still not the case asthe reaction products can be crystalline, nanocrystalline and amorphous. The characterisation of thelast two types of components are quite challenging. Here, carbonation reactions have been studied inalite-, belite- and ye’elimite-containing pastes, in controlled conditions (3% CO2 and RH = 65%). Pairdistribution function (PDF) jointly with Rietveld and thermal analyses have been applied to provethat ettringite decomposed to yield crystalline aragonite, bassanite and nano-gibbsite without anyformation of amorphous calcium carbonate. The particle size of gibbsite under these conditions wasfound to be larger (~5 nm) than that coming from the direct hydration of ye’elimite with anhydrite(~3 nm). Moreover, the carbonation of mixtures of C-S-H gel and portlandite, from alite and belitehydration, led to the formation of the three crystalline CaCO3 polymorphs (calcite, aragonite andvaterite), amorphous silica gel and amorphous calcium carbonate. In addition to their PDF profiles,the thermal analyses traces are thoroughly analysed and discussed.
PB MDPI
YR 2021
FD 2021
LK https://hdl.handle.net/10630/21851
UL https://hdl.handle.net/10630/21851
LA eng
NO Minerals 2021, 11, 519
NO This research was funded by Ministry of Science (Spain), grant number PID2019-104378RJI00,and Junta de Andalucía (Spain), grant number P18-RT-720.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 2 mar 2026