Triaxial behaviour of concrete under high stresses: Influence of the loading path on compaction and limit states

Gabet, Thomas; Malécot, Y.; Daudeville, L.

doi:10.1016/j.cemconres.2007.09.029

Cited by 162 publications

(91 citation statements)

References 6 publications

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“…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%

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: 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 metallic ring is then subjected to internal pressure due to the lateral expansion of the specimen. This technique has been used for quasi-static tests [22][23] and for dynamic ones [24][25][26]. The elastic behavior of the steel ring, and the analytical solution of a hollow cylinder submitted to inner pressure, would enable us to deduce the pressure on the inner surface knowing the cylinder deformation recorded at the outer surface.…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of an aggregate material at simultaneous high pressure and strain rate: SHPB triaxial tests

Bailly

Delvare

Vial

et al. 2011

International Journal of Impact Engineering

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International audienceLow velocity impacts on energetic materials induce plastic deformations and sliding friction which can lead to ignition. If some ignition criteria have been proposed, the remaining difficulty is to characterize the mechanical behavior of the material when submitted to the corresponding solicitations (high pressure and high strain rate). Thus, a technique based on the Split Hopkinson Pressure Bars system is proposed to carry out a triaxial compression test. A cylindrical specimen is placed into a confining ring and is compressed by the system of bars. The ring prevents the radial extension of the specimen and creates a lateral confining pressure. The material and dimensions chosen for the ring maintain a constant radial pressure during the test. Some tests were carried out on an inert aggregate material and proved the validity of this experimental device. The experimental data processing shows the influence of both the pressure and the strain rate. The shear stresses, which contribute to thermal dissipation and then to the ignition threshold, increase according to the pressure

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“…The aggregate distribution is similar to a standard concrete but at a lower scale. On the other hand, the R30A7 concrete is closer to a standard concrete with siliceous aggregates up to 8 mm diameter and a water to cement ratio of 0.64 resulting in a compressive strength of about 30 MPa [8,9]. Four levels of free-water saturation ratio are considered in the present study in the case of R30A7 concrete: dry, 60%, 80%, 100%.…”

Section: Concrete Compositionmentioning

confidence: 99%

Dynamic testing of concrete under high confined pressure. Influence of saturation ratio and aggregate size

Forquin

Piotrowska

Gary

2015

EPJ Web of Conferences

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Abstract. Concrete structures can be exposed to intense pressure loadings such as projectile-impact or detonation near a concrete structural element. To investigate the mechanical behaviour of concrete under high confining pressure, dynamic quasi-oedometric compression tests have been performed with a large diameter (80 mm) Split Hopkinson Pressure Bar apparatus. The concrete sample is placed within a steel confining ring and compressed along its axial direction. Hydrostatic pressures as high as 800 MPa and axial strain of about −10% are reached during the tests. In the present work, experiments have been conducted on two types of concrete: MB50 microconcrete with a maximum grain size of 2 mm and R30A7 ordinary concrete of maximum grain size about 8 mm. Both concretes are tested in dry or saturated conditions. According to these dynamic experiments it is noted that grain size has a small influence whereas water content has a strong effect on the confined behaviour of concrete.

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Triaxial behaviour of concrete under high stresses: Influence of the loading path on compaction and limit states

Cited by 162 publications

References 6 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

Dynamic behavior of an aggregate material at simultaneous high pressure and strain rate: SHPB triaxial tests

Dynamic testing of concrete under high confined pressure. Influence of saturation ratio and aggregate size

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