Influence of free water on the quasi-static and dynamic strength of concrete in confined compression tests

Forquin, Pascal; Safa, Kamal; Gary, G.

doi:10.1016/j.cemconres.2009.09.024

Cited by 99 publications

(67 citation statements)

References 18 publications

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“…When the ring and the specimen are of the same lengths, and if friction is neglected, the elastic cylinder can be considered in a plane stress state similar to that described by Lamé's cell. Reference [34] has also shown that if the ring is longer than the specimen, Lamé's solution is an inaccurate approximation. In this paper, the ring carrying the passive confinement is plastified.…”

Section: Dynamic Triaxial Set-upmentioning

confidence: 99%

“…Several authors, as [34], have used an elastic ring longer than the specimen. In this case the determination of the lateral stress requires some gauges along the height of the ring, numerical modeling or approximations so as to deduce, from the shape of the ring, the pressure distribution along the inner diameter of the cylinder.…”

Section: Dynamic Triaxial Set-upmentioning

confidence: 99%

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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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Section: Dynamic Triaxial Set-upmentioning

confidence: 99%

Section: Dynamic Triaxial Set-upmentioning

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

View full text Add to dashboard Cite

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“…The cylindrical samples of MB50 microconcrete were 29 mm in diameter and 40 mm in length and the steel confining ring was 60 mm in outer diameter and 45 mm long (Table 2) [7]. In the present work, the confining ring and the sample used for testing R30A7 concrete are larger ones.…”

Section: Specimen Sizementioning

confidence: 98%

“…Furthermore, strain-gauges glued on the ring provide the circumferential (hoop) strain used to estimate the level of internal radial stress σ S rr and strain ε S rr within the specimen according to the data processing proposed by [2,6,7]. In particular, the calculation of the mean radial stress σ S rr within the specimen is calculated as function of the external hoop strain ε (z=0) θθ , the shortening of the specimen (of length h) deduced by the axial strain, and the defect of symmetry (δ z ) that could result from an initial imperfect positioning or a slip of the specimen inside the ring during the test.…”

Section: Processing Methodsmentioning

confidence: 99%

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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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Numerical analysis of projectile penetration and perforation of plain and fiber reinforced concrete slabs

Smith

Cusatis

2016

Num Anal Meth Geomechanics

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Summary The research presented in this paper deals with the numerical analysis of projectile impact on regular strength concrete (RSC), high‐strength concrete (HSC), and engineered cementitious composites (ECC) using the Lattice Discrete Particle Model (LDPM). The LDPM is chosen in this study as it naturally captures the failure mechanisms at the length scale of coarse aggregate of concrete, and its capabilities include the accurate depiction of both intrinsic and apparent rate effects in concrete, as well as fiber reinforcement effects. The model is used to predict the experimental impact response performed by four independent testing laboratories, and for each data set the model parameters are calibrated and validated using a combination of uniaxial compression, triaxial compression, uniaxial strain compression, and dogbone tests. In the first study, perforation experiments on RSC and HSC for varied impact velocities are carried out, and the exit velocity is compared with the available experimental data. The second study focuses on ECC, where multiple impact of steel and plastic fiber reinforced concrete panels are explored. A third investigation is performed on four RSC panels with varied thicknesses and subjected to the same impact velocity. In this instance, the model is used to predict the penetration depths for the different cases. Finally, in the last study, the response of large‐thickness infinite panels of sizes ranging from 300 mm to 700 mm under projectile impact is considered. Copyright © 2016 John Wiley & Sons, Ltd.

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Influence of free water on the quasi-static and dynamic strength of concrete in confined compression tests

Cited by 99 publications

References 18 publications

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

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

Numerical analysis of projectile penetration and perforation of plain and fiber reinforced concrete slabs

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