Creep strain versus residual strain of a concrete loaded under various levels of compressive stress

Rossi, Pierre; Tailhan, Jean‐Louis; Maou, F Le

doi:10.1016/j.cemconres.2013.04.005

Cited by 52 publications

(29 citation statements)

References 4 publications

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“…[58][59][60] Because the loading level for the creep tests in the present investigation amounts to 30% of the average compressive strength, measured at the respective concrete ages at loading, linear viscoelastic behaviour is expected. [54,61,62] 3.1 | Tests on load-free specimens…”

Section: Resultsmentioning

confidence: 99%

“…All specimens were unmolded after 24 hr. Thereafter, the specimens for the creep and shrinkage tests were immediately protected by one layer of cling film, covered by one layer of bitumen-coated aluminium foil, similar to the sealing procedure described in recent studies [54,55] and recommended by Hubler et al [13] Hence, at the beginning of the tests for drying creep and combined autogenous and drying shrinkage, the protection could easily be removed in order to obtain unsealed specimens. Both, drying creep and drying shrinkage tests were carried out under the same environmental conditions, i.e., at constant ambient relative humidity of (65 ± 2.5)% and at a temperature of (20 ± 1)°C.…”

Section: Testing Program 221 | Creep Tests and Companion Shrinkagmentioning

confidence: 99%

“…Moreover, Figure 8 shows the evolution of total longitudinal strains provided by Rossi et al [54] for a concrete age FIGURE 7 Results of the tests on thin concrete slices: (a) mass loss until achieving sorption equilibrium at RH of 97%, 85%, 75%, 59%, and 43% and (b) water desorption isotherm (mean values and standard deviation) TABLE 4 Standard deviation of mass water contents determined on the sealed specimen and the specimens exposed to drying at different concrete ages at loading of 28 days. The loading level in the latter investigation is the same as in the present one; however, both Young's modulus and compressive strength of the concrete at the age of 28 days are higher than the present ones.…”

Section: Tests On Sealed Loaded Specimensmentioning

confidence: 99%

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Comprehensive study of concrete creep, shrinkage, and water content evolution under sealed and drying conditions

Theiner

Drexel

Neuner

et al. 2017

Strain

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A comprehensive study of the time-dependent behaviour of concrete, enhanced by measuring the evolution of the respective mass water content, is presented. Compressive creep as well as shrinkage are investigated on sealed and unsealed specimens in terms of the concrete age at loading of 2, 7, and 28 days, respectively, at a loading level of 30% of the compressive strength at loading. In addition, on the basis of the collected measurement data, the impact of load application on the moisture content is studied and the Pickett effect is re-examined. The obtained set of material data consists of basic and drying creep strains for different concrete ages at loading, autogenous shrinkage strains as well as combined autogenous and drying shrinkage strains, the evolution of the mass water content, the water desorption isotherm, and the time-dependent evolution of Young's modulus and the compressive strength. It provides a consistent set of material data for a particular concrete grade and will be available for calibrating and validating concrete models. KEYWORDS basic and drying creep, concrete, mass water content, Pickett effect, shrinkage

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Section: Resultsmentioning

confidence: 99%

Section: Testing Program 221 | Creep Tests and Companion Shrinkagmentioning

confidence: 99%

Section: Tests On Sealed Loaded Specimensmentioning

confidence: 99%

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Comprehensive study of concrete creep, shrinkage, and water content evolution under sealed and drying conditions

Theiner

Drexel

Neuner

et al. 2017

Strain

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“…However, some experimental programs and researches have also reported this phenomenon for low loading rates . Several authors have also investigated the origin of the phenomenon, relating the delayed failure of concrete to microcracking and to material damage development and progression . According to these research works, if the level of sustained stress is higher than the threshold at which microcrack propagation is likely to occur ( σ c / f c > 0.4, typically associated to the development of nonlinear creep strains), delayed damage may develop in the material.…”

Section: Introductionmentioning

confidence: 99%

“…14,31,32 Several authors have also investigated the origin of the phenomenon, relating the delayed failure of concrete to microcracking and to material damage development and progression. 14,19,33,34 According to these research works, if the level of sustained stress is higher than the threshold at which microcrack propagation is likely to occur (σ c /f c > 0.4, typically associated to the development of nonlinear creep strains), delayed damage may develop in the material. At elevated sustained stress levels (σ c /f c > 0.75, corresponding to Rüsch's sustained load strength), a significant amount of delayed damage may develop, yielding to unstable crack propagation over time and potentially to material failure.…”

Section: Introductionmentioning

confidence: 99%

Assessing the compressive strength of concrete under sustained actions: From refined models to simple design expressions

Tasevski

Ruiz

Muttoni

2019

Structural Concrete

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The detrimental influence of high levels of sustained load on the compressive strength of concrete has been acknowledged and investigated since the 1950s. Despite the potential significance of this phenomenon in many situations, current design codes still provide limited guidance on how to account for this effect at ultimate limit state. In addition, the practical case of a significant permanent stress followed by stress increases due to variable loads is not addressed in most codes of practice. The aim of this paper is to present a general but simple design approach to account for the influence of sustained loading on the uniaxial behavior of concrete in compression, both in terms of its strength and deformation capacity. This approach is based on a previously developed mechanical model accounting for nonlinear creep and material damage development on the long‐term response of concrete. On that basis, a design approach is formulated in a simple code‐like manner and used to investigate several practical design situations involving both sustained and variable actions. This approach is shown to be consistent and applicable to any general loading pattern, accurately reproducing the results of the general mechanical model and of available experimental results.

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Relationship between the residual and total strain from creep‐recovery tests of polypropylene/multiwall carbon nanotube composites

Starkova

Анискевич

Sevcenko

et al. 2020

J of Applied Polymer Sci

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An assessment of accumulated irreversible strains in polymer composites is a crucial element for controlling dimensional stability of structural components and their remnant life. The residual strains as functions of total creep strains are analyzed by example of creep-recovery data of polypropylene (PP)/multiwall carbon nanotube (MWCNT) composites. To cover wide range of strains, creep test regimes with different stresses, loading time, and number of cycles were applied. Totally, data of 62 single creep-recovery tests for 7 material compositions were used for analysis. A general empirical relationship between the residual and total creep strain is established and finely described by a power law. The residual strain increases with increasing stress and time of loading and decreases with growing amount of MWCNT. The total creep strain, which is implicitly related to stress, time, and sample specificity, determines the contribution of irreversible deformation. This fact overcomes data variability within one series of samples. Similar empirical relationships are obtained for 25 polymer composites from literature reinforced with different types and amount of fillers and tested under different temperatures. The empirical relationship can be used for an express assessment of residual strains accumulated in a long term by performing just a few short-term control tests.

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Creep strain versus residual strain of a concrete loaded under various levels of compressive stress

Cited by 52 publications

References 4 publications

Comprehensive study of concrete creep, shrinkage, and water content evolution under sealed and drying conditions

Comprehensive study of concrete creep, shrinkage, and water content evolution under sealed and drying conditions

Assessing the compressive strength of concrete under sustained actions: From refined models to simple design expressions

Relationship between the residual and total strain from creep‐recovery tests of polypropylene/multiwall carbon nanotube composites

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