D. Planela, J. Sercombe
This paper presents experimental results obtained on cement paste samples (water/cement ratio of 0.4) subjected to a low-concentration (15 mmol/l) external sulfate attack during several weeks. Chemical and microstructural analyses include the continuous monitoring of calcium loss and sulfate consumption within the cement paste, periodic layer by layer X-ray diffraction (XRD)/energy-dispersive spectrometer (EDS) analyses of the solid constituents of the cement matrix (ettringite, portlandite, gypsum) within the calcium-depleted part of the samples. Scanning electron microscopy (SEM) and visual observations are used to follow the crack pattern evolution during the external sulfate attack. The relation between the size of the specimen and crack initiation/development is investigated experimentally by performing tests on samples with different thickness/diameter ratios. Results indicate that gypsum formation occurs prior to crack formation due to the calcium source provided by the portlandite dissolution front. These results highlight the importance of understanding the kinetics of calcium leaching and sulfate attack in assessing the long-term durability of cement paste in potential nuclear waste containment applications.
@article{5da6aadc-ee7c-45a4-9812-932f8702f745,
title={Long term performance of cement paste du},
author={D. Planela and J. Sercombe},
year={2026},
language={en}
}TY - JOUR TI - Long term performance of cement paste du AU - D. Planela AU - J. Sercombe PY - 2026 LA - en ER -
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