Influence of free water on concrete triaxial behavior: The effect of porosity

Malécot, Y.; Zingg, Ludovic; Briffaut, Matthieu; Baroth, Julien

doi:10.1016/j.cemconres.2019.03.010

Cited by 87 publications

(30 citation statements)

References 33 publications

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“…4.3 Model parametric study The described model is validated analytically under hydrostatic loading using a Matlab code for a saturation ratios and initial porosities range equal to [S r = 100, 95, 85, 11%] and [φ 0 = 12, 15%] respectively. Figure 5 shows a comparison between the analytical mean stress and the experimental results obtained for both dry and saturated reference concrete [7]. The model gives very good results for saturation degrees between 85 and 95% where the consolidation point as well as the progressive increase of stiffness are well reproduced.…”

Section: Poromechanical Approachmentioning

confidence: 93%

“…Table 1 summarizes the experimental tests including the name of each test, the used sensor, the applied confinement and the maximum reached pore pressure. Figure 3 shows the results of concrete volumetric behavior during pore pressure tests compared with the results obtained by [7] on dry and very wet R30A7 samples. The volumetric strain ( v = x + 2 θ ) is estimated from the axial strain x using the LVDT and by considering that the concrete behavior is completely isotropic ( x = θ ).…”

Section: Pore Pressure Measurementmentioning

confidence: 99%

“…Many researchers have extended the previous result by investigating the effect of free water on concrete materials under high confining pressure. Triaxial tests at 600 MPa of confinement were performed by [15], [8], [7] on concrete samples having different composition and saturation ratios. Results have shown that when the water content increases, a decrease of the axial strength and a hardening of the volumetric behavior are observed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Interstitial pore pressure in concrete under high confinement pressure: measurement and modelling

Accary¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Application of concrete material in the design of protective structures requires the knowledge of its mechanical behavior when subjected to extreme loading conditions (i.e. ballistic impacts). Under such kind of loading, the material is subjected to high triaxial compressive stresses. Generally, protective concrete structures are massive and thus their drying process is very slow. Hence, the water saturation ratio may reach 100% at their core whereas their skin dries very quickly. In the last decade, a large number of studies have been conducted on this topic. Researchers studied the role of the concrete saturation ratio and initial matrix porosity on the response of concrete material under high confinement. Results have shown that the pore pressure developing in the material becomes considerable and increases the volumetric stiffness of concrete while restraining its strength capacity. This paper reports interstitial pore pressure measurement, conducted on a very wet reference concrete, under hydrostatic tests at high confinement. Experimental results show the volumetric behavior of concrete and the evolution of the pore pressure with respect to the applied confinement pressure. Then, analytical modeling, within the poromechanical framework based on the effective stress concept, is developed to estimate the interstitial pore pressure evolution under high confinement. The model shows promising results while comparing it to the experimental values.

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Section: Poromechanical Approachmentioning

confidence: 93%

Section: Pore Pressure Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interstitial pore pressure in concrete under high confinement pressure: measurement and modelling

Accary¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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“…The concrete used in this work is a type of high strength concrete which is characterized by a strong cement matrix and a lower capillary porosity in comparisson to ordinary concrete [12]. The reduced porosity is achieved by adding silica fumes to the mix and subsequently decreasing the water-cement ratio to 0.3.…”

Section: Tested Materialsmentioning

confidence: 99%

Measurement of fracture energy of a high performance concrete in dynamic tension and high strain rates

Lukić¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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This paper presents the experimental results of the dynamic fracture energy of HPC measured via the photomechanical spalling test. Full field measurements are performed and the stressfracture opening displacement curves are obtained for each visualized fracture zone from which the specific fracture energy can be calculated. First results obtained from several spalling tests were found to be lower than what is reported in the literature.

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“…A striking example is that neutrons are sensitive to water which allows both of the x-ray's limitations to be tackled -however with a limitation on the spatial resolution. The presence and movement of water (of more generally fluids) within concrete is of major interest for the mechanical behaviour of concrete under high stresses [5,6,7], for speed of chemical degradation [8], for resistance to fire [9] as well as for its quality as a material for containment [10,11]. A number of studies have been carried out on concrete using neutron radiography, allowing water infiltration to be measured with ease.…”

Section: Introductionmentioning

confidence: 99%

The colours of concrete as seen by X-rays and neutrons

Roubin

Andò

Roux

2019

Cement and Concrete Composites

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Both x-ray tomography and neutron tomography give very detailed insight in the microstructure of concrete. However, their different contrasts, due to different compositional sensitivities, make one modality more relevant for some features. The present study shows that both types of images acquired on the same specimen may be registered onto each other, after the statistical joint distribution of absorption coefficients has been learned. A Gaussian mixture model has been used to identify up to five different phases having different signatures. A staggered algorithm consisting in i) adjusting the joint histogram to fit phases and their variances and ii) registering the two 3D images onto each other, within a multi-scale algorithm is presented in details. The analysed experimental data illustrates the benefit of using jointly both modalities as compared to their parallel usage.

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Influence of free water on concrete triaxial behavior: The effect of porosity

Cited by 87 publications

References 33 publications

Interstitial pore pressure in concrete under high confinement pressure: measurement and modelling

Interstitial pore pressure in concrete under high confinement pressure: measurement and modelling

Measurement of fracture energy of a high performance concrete in dynamic tension and high strain rates

The colours of concrete as seen by X-rays and neutrons

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