Investigation of the basic creep of concrete by acoustic emission

Rossi, Pierre; Godart, N.; Robert, Jean-Louis; Gervais, Julien; Bruhat, D

doi:10.1007/bf02473211

Cited by 53 publications

(31 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The increase of the amplitude indicates the increase of the cracking rate at the initiation of the third phase for elevated stress levels (Figure 3 right). Similar behaviour was observed by Rossi et al (1994) for compressive creep and by Denarié et al (2006) for tensile creep. Rossi et al (1994) found that the basic creep strain is proportional to the number of micro-cracks created in the material.…”

Section: Discussion Of Resultssupporting

confidence: 83%

“…Similar behaviour was observed by Rossi et al (1994) for compressive creep and by Denarié et al (2006) for tensile creep. Rossi et al (1994) found that the basic creep strain is proportional to the number of micro-cracks created in the material. Denarie et al (2006) indicated that the internal damaged caused by creep-induced micro-cracking should be taken into account when evaluating the long term benefits of concrete viscoelastic behaviour.…”

Section: Discussion Of Resultssupporting

confidence: 83%

See 1 more Smart Citation

Analogy between Sustained Loading and Strain Rate Effects on the Nonlinear Creep Response of Concrete

Tasevski¹,

Ruiz²,

Muttoni³

2015

Concreep 10

View full text Add to dashboard Cite

This paper investigates the uniaxial compression behaviour of concrete under different strain rates and its relation to sustained loading. The aim is to observe the strain rate effect on the pre-and post-peak behaviour of concrete. In particular, the development of nonlinear creep strains for different strain rates has been investigated and compared to the sustained load behaviour. The development of creep strains is in accordance with the progress of cracking as observed by acoustic emissions. An analogy is found between the concrete compression behaviour under various strain rates and the concrete compression behaviour under sustained loads at different stress levels.

show abstract

Section: Discussion Of Resultssupporting

confidence: 83%

Section: Discussion Of Resultssupporting

confidence: 83%

Analogy between Sustained Loading and Strain Rate Effects on the Nonlinear Creep Response of Concrete

Tasevski¹,

Ruiz²,

Muttoni³

2015

Concreep 10

View full text Add to dashboard Cite

show abstract

“…The assumption is that the creation of microcracks during a creep step (constant load level imposed during the creep test) generates water transfers which induces some additional self-drying shrinkage. This model is consistent with records of acoustic emissions during compressive creep tests [75].…”

Section: Discussionsupporting

confidence: 80%

Investigation of the effect of aggregates' morphology on concrete creep properties by numerical simulations

Lavergne

Sab

Sanahuja

et al. 2015

Cement and Concrete Research

View full text Add to dashboard Cite

International audiencePrestress losses due to creep of concrete is a matter of interest for long-term operations of nuclear power plants containment buildings. Experimental studies by Granger (1995) have shown that concretes with similar formulations have different creep behaviors. The aim of this paper is to numerically investigate the effect of size distribution and shape of elastic inclusions on the long-term creep of concrete. Several microstructures with prescribed size distribution and spherical or polyhedral shape of inclusions are generated. By using the 3D numerical homogenization procedure for viscoelastic microstructures proposed by Šmilauer and Bažant (2010), it is shown that the size distribution and shape of inclusions have no measurable influence on the overall creep behavior. Moreover, a mean-field estimate provides close predictions. An Interfacial Transition Zone was introduced according to the model of Nadeau (2003). It is shown that this feature of concrete's microstructure can explain differences between creep behaviors

show abstract

“…We are accustomed to microcracking in concrete under increasing elastic stress, which takes place beyond the limit of linearity (Berg, 1950;Blechman, 1988Blechman, , 1997aBlechman, , 1997bSlate et al, 1981Slate et al, , 1986. However, high creep under advanced stresses and large creep strains also involves microcracking (Rossi et al, 1993;Rusch, 1959), induced by distinct behaviour of concrete components, and can lead to failure ( Figure 1). Unlike pure creep, it is an extremely complex problem.…”

Section: Pure Creepmentioning

confidence: 98%

Pure creep, maturity and MP-creep in concrete in terms of an exo-process

Blechman¹

2014

Magazine of Concrete Research

View full text Add to dashboard Cite

Pure asymptotic creep of concrete is described as a manifestation of relaxation under low constant stress, where creep-induced damage is absent. An analytical solution for pure creep is obtained as a time-operator and is shown as an exo-function. The potential of stress loss in pure creep is found to be essentially higher than in relaxation due to steady re-elevation of the relaxed stress to the initial constant value. The duration of pure creep is described and found to be prolonged versus relaxation. Elastic maturity (the increase of the elastic modulus with time) and strength maturity (increase in concrete strength with time) are also exo-processes, described by a common time-operator. For structural concrete, they differ in the exponent -for elastic maturity, the exponent is 4 . 2-4 . 8 and for strength maturity its value is 3 . 8-4 . 2, depending on the type and content of cement. The influence of temperature up to 708C is incorporated in the exo-operator of maturity. MP-creep -a combination of plain creep and increasing maturity -is described by equations, based on material parameters determined from tests. It is shown that elastic strain decreases under MP-creep. NotationA eff effective dimensionless area of bulk cross-section B h time-operator of exo-process for half its duration B in time-operator of maturity at loading B m time-operator of maturity B 28 time-operator of concrete maturity at age 28 d C f operator of total pure creep C h operator for half-creep realisation C t operator of pure creep E elastic modulus E in elastic modulus at time of loading E 28 elastic modulus, found in tests at 28 d, according to ASTM C469 (ASTM, 2010) f 28 standard strength at 28 d h Ã half-exo factor in relaxation h Ã c half-creep factor of pure creep M exponent in exo-function M t time-operator of maturity P(t ) bearing capacity of newborn grains versus time R t operator of relaxation t age of concrete t m duration of complete maturity (the same for both strength maturity and elastic maturity)t o time of loading t t ¼ t À t o time under load t t f time of complete relaxatioñ t t h time of half pure creep realisatioñ t t pc duration of pure creep t T m duration of complete maturity at temperature T

show abstract

Investigation of the basic creep of concrete by acoustic emission

Cited by 53 publications

References 4 publications

Analogy between Sustained Loading and Strain Rate Effects on the Nonlinear Creep Response of Concrete

Analogy between Sustained Loading and Strain Rate Effects on the Nonlinear Creep Response of Concrete

Investigation of the effect of aggregates' morphology on concrete creep properties by numerical simulations

Pure creep, maturity and MP-creep in concrete in terms of an exo-process

Contact Info

Product

Resources

About