Cargando…

Determination of Fracture Energy of Early Age Concrete through a Uniaxial Tensile Test on an Un-Notched Specimen

Unlike the notched specimens for conventional concrete fracture tests, this paper introduces a deformation-controlled uniaxial tensile test on an un-notched specimen. The surface of the dog bone-shaped specimen is a second order parabolic curve, and the gradual change in the specimen shape does not...

Descripción completa

Detalles Bibliográficos
Autores principales: Ren, Dongya, Houben, Lambert
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040819/
https://www.ncbi.nlm.nih.gov/pubmed/31972994
http://dx.doi.org/10.3390/ma13030496
_version_ 1783501069802799104
author Ren, Dongya
Houben, Lambert
author_facet Ren, Dongya
Houben, Lambert
author_sort Ren, Dongya
collection PubMed
description Unlike the notched specimens for conventional concrete fracture tests, this paper introduces a deformation-controlled uniaxial tensile test on an un-notched specimen. The surface of the dog bone-shaped specimen is a second order parabolic curve, and the gradual change in the specimen shape does not lead to extreme stress concentrations. Another significant feature of the tension test set-up is that it is built with three hinges, to accommodate the alignment of the specimens. The specimen preparation, test conditions, and the tension test set-up are explained in detail. The fracture energy of the concrete is determined by the obtained complete softening curves. The fracture energy is found to increase with age, going towards a horizontal asymptote as concrete hardened in a tested age range of 1 day to 90 days. Moreover, the rate of development of the fracture energy was found to be higher when compared to tensile strength and stiffness.
format Online
Article
Text
id pubmed-7040819
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-70408192020-03-09 Determination of Fracture Energy of Early Age Concrete through a Uniaxial Tensile Test on an Un-Notched Specimen Ren, Dongya Houben, Lambert Materials (Basel) Article Unlike the notched specimens for conventional concrete fracture tests, this paper introduces a deformation-controlled uniaxial tensile test on an un-notched specimen. The surface of the dog bone-shaped specimen is a second order parabolic curve, and the gradual change in the specimen shape does not lead to extreme stress concentrations. Another significant feature of the tension test set-up is that it is built with three hinges, to accommodate the alignment of the specimens. The specimen preparation, test conditions, and the tension test set-up are explained in detail. The fracture energy of the concrete is determined by the obtained complete softening curves. The fracture energy is found to increase with age, going towards a horizontal asymptote as concrete hardened in a tested age range of 1 day to 90 days. Moreover, the rate of development of the fracture energy was found to be higher when compared to tensile strength and stiffness. MDPI 2020-01-21 /pmc/articles/PMC7040819/ /pubmed/31972994 http://dx.doi.org/10.3390/ma13030496 Text en © 2020 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
Ren, Dongya
Houben, Lambert
Determination of Fracture Energy of Early Age Concrete through a Uniaxial Tensile Test on an Un-Notched Specimen
title Determination of Fracture Energy of Early Age Concrete through a Uniaxial Tensile Test on an Un-Notched Specimen
title_full Determination of Fracture Energy of Early Age Concrete through a Uniaxial Tensile Test on an Un-Notched Specimen
title_fullStr Determination of Fracture Energy of Early Age Concrete through a Uniaxial Tensile Test on an Un-Notched Specimen
title_full_unstemmed Determination of Fracture Energy of Early Age Concrete through a Uniaxial Tensile Test on an Un-Notched Specimen
title_short Determination of Fracture Energy of Early Age Concrete through a Uniaxial Tensile Test on an Un-Notched Specimen
title_sort determination of fracture energy of early age concrete through a uniaxial tensile test on an un-notched specimen
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7040819/
https://www.ncbi.nlm.nih.gov/pubmed/31972994
http://dx.doi.org/10.3390/ma13030496
work_keys_str_mv AT rendongya determinationoffractureenergyofearlyageconcretethroughauniaxialtensiletestonanunnotchedspecimen
AT houbenlambert determinationoffractureenergyofearlyageconcretethroughauniaxialtensiletestonanunnotchedspecimen