RT Journal Article
T1 Early-age reactivity of calcined kaolinitic clays in LC3 cements: a multitechnique investigation including pair distribution function analysis
A1 Bernal, Isabel M.R.
A1 García-Aranda, Miguel Ángel
A1 Santacruz-Cruz, María Isabel
A1 Gómez-de-la-Torre, María de los  Ángeles
A1 Cuesta-García, Ana María
K1 Arcilla
AB Limestone Calcined Clay Cements, LC3, allows CO2 emissions savings up to 40%. The resulting binders have competitive mechanical performances after a week. However, the reactivity of LC3 at early ages is slow and should be improved. Here, we use a multitechnique approach to help in the understanding of early age reactivities which were measured by calorimetry, Frattini assay, and mechanical strengths. The disorder in the kaolinites was quantified by powder diffraction. Some footprints of the local disorder in the resulting metakaolin have been investigated by synchrotron pair distribution function (sPDF). It is concluded that Al-O interatomic correlation position and intensity in the sPDF of the calcined kaolinitic clays could be an additional good descriptor to follow early age reactivity. The results were complemented by 27Al MAS-NMR studies. The rate of the pozzolanic reaction at early ages is governed by the particle size, surface area, and local disorder of metakaolin.
PB Taylor & Francis
YR 2022
FD 2022-09
LK https://hdl.handle.net/10630/24917
UL https://hdl.handle.net/10630/24917
LA spa
NO Bernal, Isabel M.R. (2022). Early-age reactivity of calcined kaolinitic clays in LC3 cements: a multitechnique investigation including pair distribution function analysis. En Journal of Sustainable Cement-Based Materials, 2022, online
NO https://www.tandfonline.com/doi/full/10.1080/21650373.2022.2117248
NO PID2019-104378RJ-I00 from the Spanish government and P18-RT-720 from Junta de Andalucía are acknowledged by the financial support.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026