RT Conference Proceedings
T1 Combined use of laboratory X-ray diffraction and microtomography in early age cement hydration.
A1 Cuesta-García, Ana María
A1 Shirani, Shiva
A1 Gómez-de-la-Torre, María de los  Ángeles
A1 Santacruz-Cruz, María Isabel
A1 Morales-Cantero, Alejandro
A1 Koufany, Imane
A1 Redondo-Soto, Cinthya
A1 Salcedo, Inés R.
A1 León-Reina, Laura
A1 García-Aranda, Miguel Ángel
K1 Cemento
K1 Rayos X - Difracción
AB In situ laboratory X-ray powder diffraction (LXRPD) is widely used for studying cement hydration atearly ages. However, this approach has limitations due to the intrinsic characteristics of the mainmethodologies (flat sample and capillary) and their blindness to the amorphous phases andmicrostructures. In addition, laboratory X-ray microtomography (μ-CT) is being used for severalapplications but the accuracy of the obtained results is not established. Here, we present an innovativeapproach where LXRPD and μ-CT data are taken in the same volume of the same hydrating paste withina thick capillary with time. The results from both techniques should agree, resulting in more reliableinformation. The methodology developed here is based on capillaries of 2 mm of diameter to minimizeself-drying and to have very good powder averaging. In this proof-of-principle investigation, μ-CT datahave been collected for a PC-42.5R paste, w/c=0.50, at 12 hours and 1, 3 and 7 days, and for LXRPD at1, 3 and 7 days. Powder diffraction data have been analysed by the Rietveld method and the results havebeen verified by mass balance calculations. μ-CT data have been segmented. The results indicate that thedeveloped methodology is accurate. The long-term aim of this research is to be able to monitor thereaction of the amorphous components of widely-used supplementary cementitious materials (SCMs) likethe amorphous silica in fly/volcanic ashes or the metakaolin in calcined clays.
YR 2023
FD 2023
LK https://hdl.handle.net/10630/27665
UL https://hdl.handle.net/10630/27665
LA eng
NO Financial support from PID2020-114650RB-I00 research grant, co-funded by FEDER, is acknowledged.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 12 abr 2026