|Mechanical tensile behaviour of cement paste/aggregate bond exposed to leaching |
Auteur(s): Gîrboveanu Andrei, Jebli Mouad, Jamin Frédéric, Huon Vincent, Bonnet L., Georgescu Dan, El Youssoufi Moulay Saïd
(Article) Publié: Construction And Building Materials, vol. 369 p.130592 (2023)
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An experimental program is oriented to the mechanical behaviour of the Interfacial Transition Zone (ITZ) exposed to leaching, for a single mix. Leaching kinetics of the degraded depth, measured through grey level on cross sections, reveals a maximum gap of 10 % between ITZ and bulk cement paste. ITZ, with a main thickness of 15 µm suffers a significant decalcification, which is reflected on the mechanical properties of the bond. Grey level, Calcium/Silicon (Ca/Si) molar ratio and Young’s modulus in the degraded zone present similar evolution. Effect of ITZ causing cracking and then debonding is noticed, through chemical analysis, image observation and mechanical tests.