Mechanical tensile behaviour of cement paste/aggregate bond exposed to leaching

•An experimental study concerns ITZ and the cement paste/aggregate bond.•The cement paste and the bond are exposed to leaching.•The impact of ITZ on the mechanical properties of the bond is evaluated.•A microscopic study of ITZ accompanies observations on leaching.•Effects of leaching kinetics, chem...

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Bibliographic Details
Published in:Construction & building materials 2023-03, Vol.369, p.130592, Article 130592
Main Authors: Gîrboveanu, Andrei, Jebli, Mouad, Jamin, Frédéric, Huon, Vincent, Bonnet, Laurent, Georgescu, Dan, Saïd El Youssoufi, Moulay
Format: Article
Language:English
Subjects:
Cement Paste
Chemical Sciences
Concrete
ITZ
Leaching
Material chemistry
Microstructure
Tensile Tests
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Summary:•An experimental study concerns ITZ and the cement paste/aggregate bond.•The cement paste and the bond are exposed to leaching.•The impact of ITZ on the mechanical properties of the bond is evaluated.•A microscopic study of ITZ accompanies observations on leaching.•Effects of leaching kinetics, chemical dissolution and cracking are discussed. 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.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2023.130592