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Mechanical tensile behaviour of cement paste/aggregate bond exposed to leaching
Highlights 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.
Abstract 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.
Mechanical tensile behaviour of cement paste/aggregate bond exposed to leaching
Highlights 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.
Abstract 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.
Mechanical tensile behaviour of cement paste/aggregate bond exposed to leaching
Gîrboveanu, Andrei (author) / Jebli, Mouad (author) / Jamin, Frédéric (author) / Huon, Vincent (author) / Bonnet, Laurent (author) / Georgescu, Dan (author) / Saïd El Youssoufi, Moulay (author)
2023-01-29
Article (Journal)
Electronic Resource
English
Cement Paste , Concrete , ITZ , Leaching , Microstructure , Tensile Tests
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