A Cohesive Zone Model for the Characterisation of the Interfacial Transition Zone (Itz) Between Cement Paste and Aggregate

Malachanne, Etienne; Salgues, Marie; Jebli, Mouad; Jamin, Frédéric

doi:10.7712/100016.2299.5387

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“…These experimental results on the resistance, Young's modulus and the energy at rupture are expected by the scientific community interested in the change of scales in the study of the mechanical behavior of concrete. Indeed, these quantities, which are not available, are most overestimated in numerical simulations based on the Cohesive Zone Model (CZM) [13,21]. The strategy of these models consists in transposing the local behavior on the macroscopic scale (VER) in order to deduce an equivalent behavior.…”

Section: Discussionmentioning

confidence: 99%

Experimental characterization of mechanical properties of the cement-aggregate interface in concrete

Jebli

Jamin

Malachanne

et al. 2018

Construction and Building Materials

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The microstructure of the Interfacial Transition Zone (ITZ) between the aggregates and the cement paste is characterized by a higher porosity than that of the bulk paste. The particular properties of this zone strongly influence the mechanical behavior of concrete. Microscopic cracks, which develop during subsequent loading, appear either in the matrix (cement paste or mortar) or along the cement-aggregates interface. Cracks could be caused by either tensile, shear strengths or by combinations of both. In this work, the mechanical properties of the cement paste-aggregate sample are experimentally studied. The experimental tests are performed on parallelepipedic samples at classical aggregate scale (one centimeter sections). These samples are composed of limestone aggregates and Portland cement paste, hereafter named ''composite". The cement paste is prepared with a water/cement ratio of 0.5. The shape of the prepared composites makes them convenient for direct tensile and shear tests. At different stages of hydration, we performed direct tensile and shear tests on the composites by means of specific devices. The same tests were carried out on the cement paste in order to compare with the composite results. The analysis of the experimental results showed that the tensile strength of the cement-aggregate interface was about 30% lower than that of the cement paste tensile strength. Also, the shear strength of the cement-aggregate interface was smaller than the shear strength of the cement paste. In the same way as macroscopic Mohr-Coulomb criterion, we observed an increase of shear strength when normal stress increased. It provides access to a local cohesion (c) and a local friction angle ðUÞ at classical aggregate scale.

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Section: Discussionmentioning

confidence: 99%

Experimental characterization of mechanical properties of the cement-aggregate interface in concrete

Jebli

Jamin

Malachanne

et al. 2018

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

A Cohesive Zone Model for the Characterisation of the Interfacial Transition Zone (Itz) Between Cement Paste and Aggregate

Abstract: Abstract. Characterization of concrete behavior needs to know mechanical properties of the

Cited by 1 publication

References 20 publications

Experimental characterization of mechanical properties of the cement-aggregate interface in concrete

Experimental characterization of mechanical properties of the cement-aggregate interface in concrete

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