Comparison of concrete creep in tension and in compression: Influence of concrete age at loading and drying conditions

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

doi:10.1016/j.cemconres.2013.04.001

Cited by 99 publications

(48 citation statements)

References 12 publications

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“…Whereas in nature, tensile creep has to be rather taken into account for the shrinkage cracking behavior, while compressive creep was adopted in this experiment. This is because the tensile and compressive creep behave similarly in a dried condition (Rossi et al 2013) and hence tensile creep behavior under restrained drying shrinkage might be predicted through the compressive creep test results. The effects of temperature on creep behavior were not within the scope of this study.…”

Section: (2) Creep Experimentsmentioning

confidence: 99%

Shrinkage Cracking Resistance of Blast Furnace Slag Blended Cement Concrete - Influencing Factors and Enhancing Measures

Kanda

Momose

Imamoto

2015

ACT

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Use of blast-furnace slag fine powder blended cement is an important option for lowering carbon emission in the concrete construction sector. However, concrete with blended cement (hereafter denoted as BFS concrete) has been believed vulnerable to shrinkage cracking and its use in building construction has been avoided except for underground structural elements in Japan. To develop the use of BFS concrete in building construction, quantitative evaluation of its shrinkage cracking resistance is necessary. The scope of this study included experimental verification of shrinkage resistance of BFS concrete, in which the effects of ambient temperature were emphasized, and restraint shrinkage cracking tests with BFS concrete subjected to three levels of ambient temperatures of 10, 20 and 30°C compared with normal concrete. To improve crack resistance, an improved BFS concrete using additives such as water retaining shrinkage reducing agent (SRA) was added to the experiments. As a result, the following two major conclusions were obtained: 1) The crack resistances of BFS concrete deteriorated due to increasing free shrinkage strain at high temperatures, while this was not the case for the normal concrete, and 2) water retaining type SRA dramatically improved the crack resistance of BFS concrete at high temperatures.

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Section: (2) Creep Experimentsmentioning

confidence: 99%

Shrinkage Cracking Resistance of Blast Furnace Slag Blended Cement Concrete - Influencing Factors and Enhancing Measures

Kanda

Momose

Imamoto

2015

ACT

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“…This argument is anchored on the existence of load-induced shrinkage and microcracking effect on loaded samples and this is particularly significant in tension samples which have more microcracks and hence more induced shrinkage than compression samples. It is well established that concrete cracks even with loading below its load bearing capacity and according to Rossi et al [4] there is a direct relationship between stress level (both in tension and compression) in concrete and the density of microcracks. For a loaded specimen, these loadinduced microcracks which localize at the cement paste-aggregate interface [23] combined with the preexisting cracks created by the restrained shrinkage of the cement paste by the coarse aggregate [24], could cause internal moisture gradients [11] which develop additional internal stresses within the concrete and therefore amplify shrinkage of the loaded specimen.…”

Section: Tensile Creep At Varying Rhmentioning

confidence: 99%

“…The 51% and 68% RH tests were carried out in two separate creep rooms, while for both compressive and tensile creep tests, the 100% RH was obtained by sealing the specimens with double layers of self-adhesive aluminum foil. The sealing was to prevent any moisture exchange with the environment and is a well-established practice in creep and shrinkage experiments [4,11,12]. All compressive creep specimens were cured in a fog room at 99% RH and 20 o C until the beginning of the tests in the controlled environment creep rooms.…”

Section: Compressive Creep Tests and Measurementsmentioning

confidence: 99%

“…Concrete creep can occur in tension and also in compression. The properties of tensile and compressive creep are usually considered to be similar [3,4] but several researchers have revealed that their mechanisms are quite different [5]. Several mechanisms have been proposed for creep.…”

Section: Introductionmentioning

confidence: 99%

“…It was further added that microcrack initiation causes hygral imbalance within concrete elements, which in turn causes moisture movement from capillary pores to microcrack pores leading to self-drying of the capillaries and, hence, additional shrinkage. It was therefore proposed that microcrack initiation is the origin of basic creep [4,9]. As the puzzle behind the actual mechanism of tensile and compressive creep of concrete is still unresolved, it is, however, generally accepted that they take place in the hydrated cement paste and are caused by the movement of absorbed water within and between the capillary pores and the cement gel pores in the microstructure of concrete [2,6,7,10].…”

Section: Introductionmentioning

confidence: 99%

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Influence of relative humidity on tensile and compressive creep of concrete amended with ground granulated blast-furnace slag

Ambrose

Forth

2018

Nig. J. Tech.

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This paper presents an experimental study on the influence of ambient relative humidity on tensile creep of plain concrete amended with Ground Granulated Blast-furnace Slag and compares it with its influence on compressive creep. Tensile and compressive creep tests were carried out on concrete specimens of 34.49MPa compressive strength and 0.56 water/binder ratio at 51, 68 and 100% relative humidity. The results show a linear relationship between compressive creep and relative humidity; this cannot be said about tensile creep. Tensile creep was observed to be more sensitive to change in ambient humidity than compressive creep. Based on equal applied stress, tensile creep was found to be several times higher than compressive creep and the difference was greater in drying creep than in basic creep. On the basis of equal stress/strength ratio, tensile-to-compressive creep ratio was slightly less than 1 for drying creep and much less for basic creep.

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Creep of concrete as influenced by the rate of expansion due to alkali–silica reaction

Reinhardt

Ozkan

Mielich

2019

Structural Concrete

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Three alkali-sensitive and one insensitive aggregate were used in the concrete mixes. The slow reacting aggregates were greywacke from the Lower Harz, quartz porphyry from Halle and crushed gravel from the Upper Rhine valley. The insensitive aggregate was quartz porphyry from the Black Forest. The concretes showed the typical S-shaped expansion curve in the 40 C fog room. After a certain time in the fog room, specimens were taken out and creep tests were conducted in a climate of 80% RH and 23 C. This scenario does not necessarily reproduce the situation of real structures but helps to understand the influence of ASR expansion development on creep. The creep deformation depended clearly on the preceding storage duration in the fog chamber. The largest influence on the deformation appeared at the time when the expansion rate in the fog room had a maximum.

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Comparison of concrete creep in tension and in compression: Influence of concrete age at loading and drying conditions

Cited by 99 publications

References 12 publications

Shrinkage Cracking Resistance of Blast Furnace Slag Blended Cement Concrete - Influencing Factors and Enhancing Measures

Shrinkage Cracking Resistance of Blast Furnace Slag Blended Cement Concrete - Influencing Factors and Enhancing Measures

Influence of relative humidity on tensile and compressive creep of concrete amended with ground granulated blast-furnace slag

Creep of concrete as influenced by the rate of expansion due to alkali–silica reaction

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