Influence of specimen size and measurements duration on the long-term extrapolation of drying shrinkage

Samouh, Hamza; Rozière, Emmanuel; Loukili, Ahmed

doi:10.1016/j.conbuildmat.2017.06.009

Cited by 13 publications

(4 citation statements)

References 21 publications

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“…Its relation to shrinkage is based on the diffusion analysis of drying [14]. The results reported by M. Samouh et al [14,15] show no significant effect of the size of the specimen on the shrinkage process if the specimens with similar effective thickness are used. These results are supported by H. Ba et al [16] which deals with the specimens of high differences in the effective thickness and show a high difference in the shrinkage process in dependence on the sizes of specimens.…”

Section: Discussionmentioning

confidence: 99%

Cost-Effective High-Performance Concrete: Experimental Analysis on Shrinkage

et al. 2019

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This paper focuses on the experimental determination of the shrinkage process in Self-Compacting High-Performance Concrete (SCC HPC) exposed to dry air and autogenous conditions. Special molds with dimensions of 100 mm × 60 mm × 1000 mm and 50 mm × 50 mm × 300 mm equipped with one movable head are used for the measurement. The main aim of this study is to compare the shrinkage curves of SCC HPC, which were obtained by using different measurement devices and for specimens of different sizes. In addition, two different times t0 are considered for the data evaluation to investigate the influence of this factor on the absolute value of shrinkage. In the first case, t0 is the time of the start of measurement, in the second case, t0 is the setting time. The early-shrinkage (48 h) is continuously measured using inductive sensors leant against the movable head and with strain gauges embedded inside the test specimen. To monitor the long term shrinkage, the specimens are equipped with special markers, embedded into the specimens’ upper surface or ends. These markers serve as measurement bases for the measurement using mechanical strain gauges. The test specimens are demolded after 48 h and the long term shrinkage is monitored using the embedded strain gauges (inside the specimens) and mechanical strain gauges that are placed, in regular intervals, onto the markers embedded into the specimens’ surface or ends. The results show that both types of measurement equipment give a similar result in the case of early age measurement, especially for the specimens cured under autogenous conditions. However, the early age and especially long term measurement are influenced by the position of the measurement sensors, particularly in the case of specimens cured under dry air conditions. It was proven that the time t0 have a fundamental influence on the final values of the shrinkage of investigated SCC HPC and have a significant impact on the conclusions on the size effect.

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Section: Discussionmentioning

confidence: 99%

Cost-Effective High-Performance Concrete: Experimental Analysis on Shrinkage

et al. 2019

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“…This aspect has been approached by (Torrenti, 2013) and more recently by (Samouh, 2017) but both studies used very limited experimental evidence and the analytical as well as the numerical analysis did not show a good agreement with the experimentally observed trends.…”

Section: Introductionmentioning

confidence: 95%

Size Effect on the Ultimate Drying Shrinkage of Concrete – Modeling With Microprestress-Solidification Theory

Dohnalová¹,

Havlásek²

2020

Engineering Mechanics 2020

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Drying shrinkage of concrete is a distinctively long-term process which is affected by many factors ranging from concrete composition, curing and ambient conditions to the dimensions and shape of the investigated structural member. In the case of standard-size structural members the ultimate value of drying shrinkage is reached within several decades, which hampers the experimental verification. In a reasonable time scope (e.g. 1 year) even the standard laboratory-size specimens provide only the initial evolution of shrinkage which cannot be extrapolated owing to the ill-posed nature of the problem. Furthermore, the experimental data indicate that there is a non-negligible size effect on the ultimate drying shrinkage which makes the transition from laboratory to structural size even more difficult. The objective of the current research is to assess this size effect from the perspective of the experimental data found in the literature, the design codes and prediction models for the long-term behavior of concrete, and finally, the coupled FEM simulations with the advanced constitutive model based on the Microprestress-Solidification theory.

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“…Naturally, the specimens had to be manufactured from the same concrete mixture and stored at the same conditions for sufficiently long period of time to reach the ultimate shrinkage strain. Except for the findings reported by Samouh [6], Keeton [14], and Bryant [12], the experimental data investigated in this study are adapted from the Creep and shrinkage database developed at the Northwestern University [16]. Keeton's original data on total shrinkage was preferred to the database which contains somehow modified values.…”

Section: Experimental Datamentioning

confidence: 99%

“…The first one [5] compares the size effect on drying shrinkage according to EC2 with two experimental series only and concludes that even the current coupled FEM simulations are unable to capture the phenomenon. The second, more recent paper [6] is oriented more on the extrapolation of the drying shrinkage rather than on the size effect law, however, the original data from this paper are adapted in the present study.…”

Section: Introductionmentioning

confidence: 99%

Size Effect on the Ultimate Drying Shrinkage of Concrete - Experimental Evidence and Engineering Practice

Dohnalová

Havlásek

2020

APP

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The design and behavior of creep-sensitive structures can be to a large extent dependent on the evolution of drying shrinkage. Drying shrinkage of concrete measured on standard laboratory specimens is very time demanding, furthermore, the extrapolation based on the short-term measurements is an ill-posed problem and can lead to large errors. Additionally, the final magnitude of shrinkage is size-dependent which makes the transition from the laboratory data to real structure even more challenging. The present paper evaluates this size effect based on the data gathered in the Creep and shrinkage database developed at the Northwestern university and the data from the literature. Finally, this size effect is compared against the current codes of practice and recommendations.

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Influence of specimen size and measurements duration on the long-term extrapolation of drying shrinkage

Cited by 13 publications

References 21 publications

Cost-Effective High-Performance Concrete: Experimental Analysis on Shrinkage

Cost-Effective High-Performance Concrete: Experimental Analysis on Shrinkage

Size Effect on the Ultimate Drying Shrinkage of Concrete – Modeling With Microprestress-Solidification Theory

Size Effect on the Ultimate Drying Shrinkage of Concrete - Experimental Evidence and Engineering Practice

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