Sulfate performance of blended cements (limestone and illite calcined clay) exposed to aggressive environment after casting
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10.1016/j.cemconres.2021.106495
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/354401
Tipus de documentArticle
Data publicació2021-09-01
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Abstract
This paper evaluates how early aggressive exposure affects the sulfate resistance of blended cements containing limestone filler and/or calcined clay. Mortar and cement paste specimens were elaborated with different combinations of limestone filler and two different illitic calcined clays and exposed to a sodium sulfate solution shortly after casting. Assessment of sulfate resistance was based on expansion, mass variation, and compressive strength. Microscale evolution and distribution were examined by mercury intrusion porosimetry, X-ray diffraction, and scanning electron microscopy with energy-dispersive spectrometry measurements. Results prove superior sulfate resistance of compositions with high calcined clay content over limestone filler addition. Furthermore, the results reported suggest that the pozzolanic reaction progresses enough to reduce the sulfate ingress even at early exposure conditions. Therefore, calcined clay replacement can still provide effective pore refinement to limit sulfate penetration, increase strength, and reduce available CH to limit expansive phase formation.
CitacióRossetti, A. [et al.]. Sulfate performance of blended cements (limestone and illite calcined clay) exposed to aggressive environment after casting. "Cement and concrete research", 1 Setembre 2021, vol. 147, p. 106495:1-106495:15.
ISSN0008-8846
Versió de l'editorhttps://www.sciencedirect.com/science/article/abs/pii/S0008884621001447
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