Basic creep behavior of concretes investigation of the physical mechanisms by using acoustic emission

Rossi, Pierre; Tailhan, Jean‐Louis; Maou, F Le; Gaillet, Laurent; Martin, Éric

doi:10.1016/j.cemconres.2011.07.011

Cited by 167 publications

(96 citation statements)

References 7 publications

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“…However, their suitability for tensile creep prediction is in question as the mechanisms of compressive and tensile creep are different. Several integrated theories [8][9][10][11][12][13][14][15][16][17][18][19] have been proposed for the mechanism of compressive creep; in these theories, creep is ascribed to more than one of the following mechanisms: mechanical deformation theories, plastic theories, viscous and visco-elastic flow theories, delayed elasticity, seepage theory, microcracking, activation energy theory, solidification theory and microprestress-solidification theory. However, for tensile creep the more popular consensus, as mentioned earlier, is that its mechanism is dominated by microcracking.…”

Section: Introductionmentioning

confidence: 99%

Predicting the tensile creep of concrete

Forth

2015

Cement and Concrete Composites

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Over a four year period, six phases of testing were performed to observe the influence of age at loading, applied stress level, mix composition and relative humidity on the tensile creep of concrete. From these investigations it was possible to develop a model which allowed the prediction of tensile creep based on a knowledge of the compressive strength of the concrete (determined at the age of loading), the applied stress level and the relative humidity. Subsequently, this model was validated using the results from three independent investigations. Compressive creep as well as tensile creep was also obtained. This allowed a comparison of compressive creep with tensile creep and illustrated that on the basis of equal stresses, tensile creep is on average between 2 and 3 times greater than compressive creep (the maximum ratio is in excess of 8). For this investigation, however, on the basis of stress / strength ratio the difference between tensile and compressive creep is less significant. Considering a simply supported flexural reinforced concrete element, the investigation suggests that it is unwise to consider actual compressive creep equal to actual tensile creep as is often the case in design practice.

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Section: Introductionmentioning

confidence: 99%

Predicting the tensile creep of concrete

Forth

2015

Cement and Concrete Composites

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“…The results presented in this paper are analysed under the assumption that microcracks are the principal driving force of creep [14][15][16] under high sustained loading. In addition, an experimental study by Daviau-Desnoyers, Charron [8] has shown that the inclusion of fibres in the cementitious matrix does not modify the driving mechanism of crack propagation at high sustained loads.…”

Section: Load Levelsmentioning

confidence: 99%

Influence of reinforcement type on macrocrack propagation under sustained loading in steel fibre‐reinforced concrete

Daviau‐Desnoyers¹,

Charron

Massicotte

et al. 2016

Structural Concrete

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To meet the growing challenges of sustainability, it is necessary to control and anticipate cracking problems of structures under sustained loadings. At the structural scale, very little information is available regarding the combined effect of SFRC and reinforcement under Accepted Article www.ernst-und-sohn.de Page 2 Structural Concrete sustained flexural loading. This paper presents the results of four flexural creep tests on steel fibre reinforced concrete large beams reinforced with fibres only or in combination with unbonded prestressing strands, bonded prestressing strands, or traditional reinforcing bars.The main objective was to assess the influence of the reinforcement type on crack propagation, crack openings, and compliance evolution under sustained loading in SFRC.The results show that the thriving mechanism of crack propagation is the same for all beams, regardless of the reinforcement type, and is therefore governed by type of fibre concrete.

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“…Many mechanisms considered to be responsible for the time-dependent behaviour of concrete or having an effect on it have been proposed and studied (Bazant, 2001;Hamed, 2015;Rossi et al, 2012). These have enabled researchers to formulate mathematical theories (Bazant, 2001, Bazant andBaweja, 1995;Choi et al, 2015) to describe the time-dependent behaviour of concrete under load.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent brittle creep-relaxation failure in concrete

Wang

Zhang

Hao

2016

Magazine of Concrete Research

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In real-world engineering applications, concrete is usually subjected to both creep and stress relaxation. Observations are necessary to understand this coupling process. This paper presents the results of brittle creep-relaxation experiments performed on concrete. Instead of tending to an asymptotic value, the stress in all the test specimens dropped sharply with a rapid increase in the strain before failure, when the boundary displacement was kept constant. The acceleration in the tertiary stage exhibited power-law behaviour, with the exponent − α being − 0·58 ± 0·13 for the stress rate and − 0·56 ± 0·12 for the strain rate. For each specimen, the time-to-failure exhibited power-law dependence on the secondary creep (relaxation) rate, with the exponent being 0·97 ± 0·09 for strain and 0·98 ± 0·09 for stress. These results suggest that it should be possible to predict the time-to-failure of concrete by monitoring its behaviour during the steady and critical stages.

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Basic creep behavior of concretes investigation of the physical mechanisms by using acoustic emission

Cited by 167 publications

References 7 publications

Predicting the tensile creep of concrete

Predicting the tensile creep of concrete

Influence of reinforcement type on macrocrack propagation under sustained loading in steel fibre‐reinforced concrete

Time-dependent brittle creep-relaxation failure in concrete

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