Characterization of Concrete in Mixed Mode Fracture Under Confined Conditions

Montenegro, Oscar I.; Sfer, Domingo; Carol, Ignacio

doi:10.1007/978-1-4020-6239-1_97

Cited by 9 publications

(6 citation statements)

References 3 publications

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“…The aim of the present work is to investigate the quasi-static and dynamic shear behavior of concrete under confined conditions. In previous experiments, concrete samples were either subjected to a small level of confinement [7] or a high level of confinement with a passive metallic cell [14]. In the last method, a strong change of confinement level occurs during the tests and constitutes a major drawback of this technique.…”

Section: Discussionmentioning

confidence: 99%

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Experimental study of the static and dynamic behavior of pre-stressed concrete subjected to shear loading

Abdul‐Rahman

Saletti

Forquin

2021

Engineering Structures

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Section: Discussionmentioning

confidence: 99%

“…Another new experimental technique to study materials under shear loading was considered by [5]. This technique was then developed by [6][7][8]. The specimen is a short cylindrical sample with two cylindrical coaxial notches on the top and bottom faces leaving a cylindrical ligament.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the static and dynamic behavior of pre-stressed concrete subjected to shear loading

Abdul‐Rahman

Saletti

Forquin

2021

Engineering Structures

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“…Several PTS quasi‐static and dynamic experiments from the literature are gathered in Table 1. The Mode II fracture toughness of rocks was explored by Backers et al, [ 12,13 ] , Lee et al [ 14 ] and Luong [ 11 ] and more recently by Backers and Stephansson, [ 17 ] Li et al [ 22 ] and Yao et al [ 23 ] This technique was also used by Montenegro et al [ 15,16 ] to evaluate the mode II fracture energy of conventional concrete (maximum aggregate size 6 mm) as function of the hydrostatic pressure. Whereas no confining pressure was applied to the sample in the experiments from previous studies, [ 10,11,12 ] hydraulic pressure below or above the sample uniaxial compressive strength was considered for instance in the work from Backers et al [ 12,13 ] However, the hydraulic confinement used in PTS experiments presents several limitations and drawbacks: PTS experiments with hydraulic confinement require the use of triaxial presses that are quite expensive apparatus and difficult to operate.…”

Section: Introductionmentioning

confidence: 99%

A novel experimental method to characterise the shear strength of concrete based on pre‐stressed samples

Forquin

Abdul‐Rahman

Saletti

2022

Strain

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The present paper describes a novel experimental method for characterising the confined shear strength of concrete or rock‐like materials based on the use of pre‐stressed sample. This method, called PS‐PTS (Pre‐Stressed Punch‐Through‐Shear), employs a metallic confinement cell that is first quasi‐statically deformed so the concrete sample can be introduced in between the cell jaws. The confinement force is transmitted to the sample in the unloading stage. It is shown that this initial pre‐load level can be predicted by an elastic closed‐form solution. Strain‐gauges glued on the cell allow the confinement level applied to the sample to be experimentally measured during the pre‐stressing stage and the shear stage. In the next stage, the central part of the sample is subjected to a differential displacement towards the lateral parts by means of a hydraulic press so the confined shear strength of the tested material can be deduced. The results are compared to the data previously obtained with an “oedometric” confinement cell in terms of confinement stresses and shear strength. Highlights A Pre‐Stressed Punch‐Through‐Shear technique is proposed based on pre‐loaded cell. A close‐form solution predicts the level of pre‐load applied to the sample. The cell is instrumented with strain gauges, so the applied forces are measured. The technique is applied to characterise the confined shear strength of concrete. Results are compared to those obtained with the ‘Oedo‐PTS’ testing method.

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“…The specimen is first subjected to a pure hydrostatic pressure whereas an axial load is added in a second step to create a shear fracturing of the ligament. This technique was more recently used by Montenegro et al [6] to evaluate the fracture energy of concrete as function of the hydrostatic pressure. More recently, a passive confining cell was used instead of hydraulic pressure to apply a confinement to the PTS specimen ( Fig.…”

Section: Introductionmentioning

confidence: 99%

A novel experimental method to characterise the shear strength of concrete based on pre-stressed samples. A comparison with existing techniques

2018

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Mode II shear fracture process can be observed in plain-concrete structures exposed to intensive loadings such as shock, blasting or projectile-impact. It is the reason why the quasi-static and dynamic shear fracturing properties of concrete need to be investigated. In previous works performed by Forquin and coauthors a passive confining cell was applied to PTS (Punch-Through-Shear) specimens in a similar way than in quasi-oedometric compression tests where metallic ring are used as passive confinement. However the change of confining level during the sample loading constitutes a main drawback of this technique. In the present work a novel testing method is proposed based on a pre-stressing of the sample. To do so, the concrete specimen is inserted into pre-stressed metallic cell. During the unloading stage confining stresses are transferred to the ligament of the sample. In a second stage, a differential displacement applied to the central part of the sample toward the side parts produces a shearing of the ligament. The experiments performed in static and dynamic conditions (SHPB testing) allow the shear response of concrete to be determined over a wide range of strain-rates. In the present communication, the testing technique and obtained results are compared to the obtained data with the previous experimental method.

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Characterization of Concrete in Mixed Mode Fracture Under Confined Conditions

Cited by 9 publications

References 3 publications

Experimental study of the static and dynamic behavior of pre-stressed concrete subjected to shear loading

Experimental study of the static and dynamic behavior of pre-stressed concrete subjected to shear loading

A novel experimental method to characterise the shear strength of concrete based on pre‐stressed samples

A novel experimental method to characterise the shear strength of concrete based on pre-stressed samples. A comparison with existing techniques

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