Strength and damage of concrete under high triaxial loading

Malécot, Y.; Daudeville, L.; Dupray, Fabrice; Poinard, C.; Buzaud, Eric

doi:10.1080/19648189.2010.9693262

Cited by 56 publications

(30 citation statements)

References 25 publications

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“…15). For example, Malecot et al (2010) found clear increase of ductile strength up to P c = 400 MPa. This is probably because much of the shear strength of HC is supported by the strong gravel framework, whose plastic flow would require extreme conditions.…”

Section: Confining Pressure Dependence During Ductile Deformationmentioning

confidence: 96%

“…Many studies have investigated the performance of hardened concrete (HC) under high P c (Gabet and Daudeville 2008;Malecot et al 2010;Poinard et al 2010). For example, the effects of cement paste volume, aggregate size (Vu et al 2011) and shape (Poinard 2012), saturation degree (Vu et al 2009), and loading rate (Zeng et al 2013) have been investigated.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Behavior of Cement Paste and Alterations of Hydrates under High-Pressure Triaxial Testing

Sakai

Nakatani

Takeuchi

et al. 2016

ACT

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High confining pressure works on concrete under various conditions such as concrete structures deep underground/sea, the lower floors of an extremely tall building and on the foundation concrete piles of an enormous structure such as dam. Understanding the performance of concrete and the deformation mechanism under high confining pressure is important for avoiding unexpected risks and for rationalization of design. A high-pressure triaxial test was conducted on cement paste to understand the mechanism of mechanical performance of concrete under a high confining pressure. The deviatoric stress-axial strain relationship of cement paste was independent of confining pressure during ductile deformation under confining pressures greater than 30 MPa. Ion-milled cross-sections of specimens were examined by scanning electron microscopy, and the obtained backscattered electron images were darker after the test. This darkening may indicate the alteration of hydrates at the molecular level caused by deformation involving crystal plasticity. Furthermore, the pore volume of the sample tested at 400 MPa was drastically reduced.

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Section: Confining Pressure Dependence During Ductile Deformationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Cement Paste and Alterations of Hydrates under High-Pressure Triaxial Testing

Sakai

Nakatani

Takeuchi

et al. 2016

ACT

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“…The behaviour of concrete under multi-axial stress conditions was intensively studied to develop a general criterion for irreversible material response (Buyukozturk and Tseng 1984;Imran and Pantazopoulou 1996;Sfer et al 2002;Tan 2005;Lu 2005;Gabet et al 2008;Malécot et al 2010;Hammoud et al 2014;Zhou et al 2014) (plasticity and/or failure). Numerous types of concrete failure criteria have been developed, aimed at defining an adequate shape of the limit surface (Chen 1982;Comi 2001;Cho and Park 2003;Dede and Ayvaz 2010;Comi et al 2012;Bao et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Modelling of Stirrup Confinement Effects in RC Layered Beam Finite Elements Using a 3D Yield Criterion and Transversal Equilibrium Constraints

Berke¹,

Massart²

2018

Int J Concr Struct Mater

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Apart from its recognized strengthening effect for shear loading, the presence of stirrups in reinforced concrete results in an increase of the ductility of structural members and in the capacity of reaching higher longitudinal compressive stress levels provided by transversal confinement. These effects are usually represented phenomenologically in fibre beam models by artificially increasing the compressive strength and the ultimate compressive strain of concrete. Two numerical formulations for layered beam descriptions accounting explicitly for transversal confinement are implemented and assessed in this contribution. The influence of stirrups is incorporated by means of a multi-dimensional yield surface for concrete, combined with equilibrium constraints for the transversal direction involving concrete and steel stirrups, and with a concrete ultimate strain dependent on the hydrostatic stress. This contribution focuses on the numerical formulations of both frameworks, and on their assessment against experimental results available in the literature. Keywords

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“…This behaviour of concrete changes when it is subjected to a confining pressure. Concrete can deform extensively under high confining pressure without stress drop, though such a situation causes macroscopic damage (Gabet et al 2008;Malecot et al 2010;Poinard et al 2010;Sfer et al 2002). On the other hand, hardened cement paste (HCP) can undergo large deformation without damage under confining pressure (Sakai et al 2016;Sakai and Kishi 2017).…”

Section: Introductionmentioning

confidence: 99%

Deformation Mechanism of Cement Paste and Hydrates under High Stress

Sakai

Uehara

2018

ACT

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Hardened cement paste (HCP) and compacts made of hydrates were analysed to understand the deformation mechanism of hardened concrete. A normal creep test and a creep test with stepwise increasing load were performed on HCP, and the results indicated that the deformation of HCP is governed by dislocation creep. The stepwise creep test was performed on the compacts of calcium hydroxide, synthesized ettringite, and calcium silicate hydrate (C-S-H), and crushed HCP at a confining pressure of 50 MPa. The hydrates, except for C-S-H, demonstrated similar behaviour, and the slope of the strain rate-differential stress curve was approximately three. According to a common classification, this slope indicates the deformation governed by dislocation creep. The synthesized C-S-H showed a higher strain rate compared to the other hydrates, and the slope in this case was negative or approximately zero. Therefore, we inferred that the deformation mechanism of C-S-H is different from those of the other hydrates and that C-S-H is not dominant when HCP deforms under high confining pressure. However, C-S-H occupies the largest volume in HCP. We justified this contradiction by assuming that C-S-H is squeezed out rapidly in the deformation; the structure then formed is composed of hydrates other than C-S-H, and the deformation of this structure is governed by dislocation creep.

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Strength and damage of concrete under high triaxial loading

Cited by 56 publications

References 25 publications

Mechanical Behavior of Cement Paste and Alterations of Hydrates under High-Pressure Triaxial Testing

Mechanical Behavior of Cement Paste and Alterations of Hydrates under High-Pressure Triaxial Testing

Modelling of Stirrup Confinement Effects in RC Layered Beam Finite Elements Using a 3D Yield Criterion and Transversal Equilibrium Constraints

Deformation Mechanism of Cement Paste and Hydrates under High Stress

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