Cargando…

Permeability of a Macro-Cracked Concrete Effect of Confining Pressure and Modelling

The effects of confining pressure are investigated for two samples of a macro-cracked concrete. Samples are first macro-cracked with a splitting tensile strength test (Brazilian) technique. Gas permeability is continually measured under increasing (or decreasing) confining pressure, whereas crack cl...

Descripción completa

Detalles Bibliográficos
Autores principales: Chen, Wei, Han, Yixuan, Agostini, Franck, Skoczylas, Frederic, Corbeel, Didier
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7918231/
https://www.ncbi.nlm.nih.gov/pubmed/33670302
http://dx.doi.org/10.3390/ma14040862
_version_ 1783657879059824640
author Chen, Wei
Han, Yixuan
Agostini, Franck
Skoczylas, Frederic
Corbeel, Didier
author_facet Chen, Wei
Han, Yixuan
Agostini, Franck
Skoczylas, Frederic
Corbeel, Didier
author_sort Chen, Wei
collection PubMed
description The effects of confining pressure are investigated for two samples of a macro-cracked concrete. Samples are first macro-cracked with a splitting tensile strength test (Brazilian) technique. Gas permeability is continually measured under increasing (or decreasing) confining pressure, whereas crack closure (or opening) is recorded with an LVDT (Linear Variable Differential Transformer) device. Despite a mechanical closure of the macro-crack, identified at around 20 MPa confining pressure, gas permeability continues to decrease as confinement is increased. This means that a model of the macro-crack by two parallel planes (using Poiseuille law) cannot be used to represent permeability variations during closure (or opening) of cracks. As a consequence, a physical model is designed in order to simulate with a better consistency the real behaviour of the macro-crack. This simple modelling allows both behaviours, mechanical and hydraulic, under confining pressure, to be simulated with the same set of parameters.
format Online
Article
Text
id pubmed-7918231
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-79182312021-03-02 Permeability of a Macro-Cracked Concrete Effect of Confining Pressure and Modelling Chen, Wei Han, Yixuan Agostini, Franck Skoczylas, Frederic Corbeel, Didier Materials (Basel) Article The effects of confining pressure are investigated for two samples of a macro-cracked concrete. Samples are first macro-cracked with a splitting tensile strength test (Brazilian) technique. Gas permeability is continually measured under increasing (or decreasing) confining pressure, whereas crack closure (or opening) is recorded with an LVDT (Linear Variable Differential Transformer) device. Despite a mechanical closure of the macro-crack, identified at around 20 MPa confining pressure, gas permeability continues to decrease as confinement is increased. This means that a model of the macro-crack by two parallel planes (using Poiseuille law) cannot be used to represent permeability variations during closure (or opening) of cracks. As a consequence, a physical model is designed in order to simulate with a better consistency the real behaviour of the macro-crack. This simple modelling allows both behaviours, mechanical and hydraulic, under confining pressure, to be simulated with the same set of parameters. MDPI 2021-02-11 /pmc/articles/PMC7918231/ /pubmed/33670302 http://dx.doi.org/10.3390/ma14040862 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Chen, Wei
Han, Yixuan
Agostini, Franck
Skoczylas, Frederic
Corbeel, Didier
Permeability of a Macro-Cracked Concrete Effect of Confining Pressure and Modelling
title Permeability of a Macro-Cracked Concrete Effect of Confining Pressure and Modelling
title_full Permeability of a Macro-Cracked Concrete Effect of Confining Pressure and Modelling
title_fullStr Permeability of a Macro-Cracked Concrete Effect of Confining Pressure and Modelling
title_full_unstemmed Permeability of a Macro-Cracked Concrete Effect of Confining Pressure and Modelling
title_short Permeability of a Macro-Cracked Concrete Effect of Confining Pressure and Modelling
title_sort permeability of a macro-cracked concrete effect of confining pressure and modelling
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7918231/
https://www.ncbi.nlm.nih.gov/pubmed/33670302
http://dx.doi.org/10.3390/ma14040862
work_keys_str_mv AT chenwei permeabilityofamacrocrackedconcreteeffectofconfiningpressureandmodelling
AT hanyixuan permeabilityofamacrocrackedconcreteeffectofconfiningpressureandmodelling
AT agostinifranck permeabilityofamacrocrackedconcreteeffectofconfiningpressureandmodelling
AT skoczylasfrederic permeabilityofamacrocrackedconcreteeffectofconfiningpressureandmodelling
AT corbeeldidier permeabilityofamacrocrackedconcreteeffectofconfiningpressureandmodelling