Experimental validation of a framework for hygro-mechanical simulation of self-induced stresses in concrete

Azenha, Miguel; Leitão, Luís; Granja, José Luís Duarte; Sousa, Christoph Fernandes; Faria, Rui; Barros, Joaquim A. O.

doi:10.1016/j.cemconcomp.2017.02.008

Cited by 22 publications

(17 citation statements)

References 19 publications

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“…In that experimental campaign, shrinkage was also measured in 2 mm thick cement paste specimens, exposed to variable relative humidity values. Given than this drying shrinkage model provided a good agreement with the experimental results for specimens of the three thicknesses -see Azenha et al (2017) -it is expected to provide an acceptable estimated for the 50 cm thick member, bearing in mind the objectives of the present work. It should be noted that the concrete material properties considered for the structures analysed in this paper correspond to the ones of the experimental campaign described in Azenha et al (2017).…”

mentioning

confidence: 66%

“…where t is the time and * H D is the diffusion parameter which lumps the diffusivity and the moisture capacity of the material. The validity of this modelling approach was justified by Azenha et al (2017). * H D is given by the following equation, initially proposed by Bazant and Najjar (1972):…”

Section: Hygral Modelmentioning

confidence: 99%

“…The tensile fracture properties of concrete, and the bond action between steel and concrete are also considered, in order to simulate the crack formation and propagation processes in end restrained members. The thermal an hygral models, as well as the procedure for estimation of self-induced deformations, are based on previously validated methodologies (Azenha et al 2017;Faria et al 2006). For the mechanical analysis, previously implemented numerical models (Azenha et al 2011;Sousa et al 2018) are further developed so that they can be used in the study of thick members.…”

Section: Introductionmentioning

confidence: 99%

“…where , ds ult ε is a material parameter that represents the concrete shrinkage upon total (or almost total) drying. This procedure was experimentally validated by Azenha et al (2017), by performing shrinkage and humidity measurements (at various depths) in concrete specimens of different sizes (10 cm, 15 cm and 20 cm thick concrete prisms). In that experimental campaign, shrinkage was also measured in 2 mm thick cement paste specimens, exposed to variable relative humidity values.…”

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confidence: 99%

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Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

Azenha¹,

Schlicke²,

Benboudjema³

et al. 2019

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This special issue of the Journal of Advanced Concrete Technology presents seven invited journal papers, which were selected on basis of outstanding conference contributions during the International RILEM/COST conference SynerCrete'18, held on 24-26 October 2018 in Funchal, Madeira Island, Portugal, which gathered 183 participants. The selection was made by the scientific committee and the chairpersons among 184 contributions. The conference itself dealt with interdisciplinary approaches for cement-based materials and structural concrete, intending to provide added value through collaborations across the entire field of structural concrete-ranging from concrete technology, over simulation and structural design, production and building, up to operation, monitoring and maintenance. Exciting fields of research such as performance-based design, 3D modelling for analysis/design, Building Information Modelling and even robotics (e.g. digital fabrication or robotics design) were included, while retaining focus on multi-scale approaches at time and spatial levels. Overall, the hereby promoted journal papers are representative for the successful balance act between a great versatility of the conference contributions and the targeted synergizing of expertise aiming on the ultimate goal of reliable and durable concrete structures. SynerCrete'18 also marked the end of COST Action TU1404 "Towards the next generation of standards for service life of cement-based materials and structures" (www.tu1404.eu), offering a final forum to the discussions raised during the funded period of the Action from 2014 to 2018. A sense of accomplishment was felt by all the members of the Action, in the view of the important achievements of networking tools that were brought about by the extended Round Robin Testing Programme (RRT+), the Numerical Benchmarking Activities and 24 Short Term Scientific Missions (STSMs). Some of the selected papers in this special issue are the result of fruitful collaborations initiated by COST Action TU1404. A further remark in regard to the wide international institutional support that this conference attained, is about the direct support of RILEM, fib, JCI and ACI. Specifically, with regard to the Japanese Concrete Institute, a mention is given to the special session dedicated to the most recent version of "JCI Guidelines for Control of Cracking of Mass Concrete", as it was indeed one of the most inspiring documents that influenced the genesis of COST Action TU1404.

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confidence: 66%

Section: Hygral Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

Azenha¹,

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Benboudjema³

et al. 2019

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“…This is usually referred to as the ‘self‐restraining’ effect and can cause surface cracks and curling/buckling of floors. It should be noted that this effect occurs in both restrained and free elements and the corresponding surface cracks may reduce in width after moisture equilibrium between the element and the environment 17–19 . When studying drying shrinkage, samples are generally rather small/thin, at least in one direction, either plate‐like or small beams.…”

Section: Significance Of Restraining Devices For Time‐dependent Behavmentioning

confidence: 99%

Longitudinal restraining devices for the evaluation of structural behaviour of cement‐based materials: The past, present and prospective trends

Kanavaris

Azenha

Schlicke

et al. 2020

Strain

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The problem of thermal and shrinkage cracking in concrete has been long recognised by researchers and engineers as it can jeopardise the intended serviceability of a concrete structure. This has led researchers to develop testing devices which aim to simulate the behaviour of concrete under restrained deformations. Such devices are discerned in passive and active, depending on how concrete's movement is restrained, whilst a new type of devices has been developed to account for the combined effects of intrinsic restrained deformations and externally imposed actions. This paper presents a detailed and critical literature review on the developed restraining devices and an analysis of the capabilities, complexities and peculiarities associated with their use. Further to this, the challenges the developers of testing devices are faced with, the gaps and uncertainties with the methods found in the literature and recommendations for potential improvements in the field are discussed. K E Y W O R D Screep and shrinkage, heat of hydration, restraining devices, restraint, shrinkage cracking, thermal cracking, viscoelasticity

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Validation of Thermo-hygro-Mechanical FEM Analysis of Thick Restrained RC Members by Comparison with Experiments

et al. 2021

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Experimental validation of a framework for hygro-mechanical simulation of self-induced stresses in concrete

Cited by 22 publications

References 19 publications

Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

Longitudinal restraining devices for the evaluation of structural behaviour of cement‐based materials: The past, present and prospective trends

Validation of Thermo-hygro-Mechanical FEM Analysis of Thick Restrained RC Members by Comparison with Experiments

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