Assessment of the application "twist-off" method for determining the in situ compressive and flexural strengths in the fiber concrete

Since the batching, transportation, pouring, compaction and curing of the specimens used in laboratory testing of concrete, either from these employed in real structures, the in-situ methods are needed for assessing the quality of existing concrete in structures. Among the tests with partial failure...

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Autores principales:	Mahmood Naderi, Alireza Esmaeli, Ali Saberi Varzaneh
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2021
Materias:	concrete twist-off fibre failure modulus nonlinear Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/def727891d094ae990d5cac0bdff9a59
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spelling	oai:doaj.org-article:def727891d094ae990d5cac0bdff9a592021-11-08T15:54:39ZAssessment of the application "twist-off" method for determining the in situ compressive and flexural strengths in the fiber concrete2476-39772538-261610.22065/jsce.2019.155083.1702https://doaj.org/article/def727891d094ae990d5cac0bdff9a592021-05-01T00:00:00Zhttps://www.jsce.ir/article_86850_3ceb0137f99a68060e1889150f186267.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Since the batching, transportation, pouring, compaction and curing of the specimens used in laboratory testing of concrete, either from these employed in real structures, the in-situ methods are needed for assessing the quality of existing concrete in structures. Among the tests with partial failure, the "twist-off" method is used for determining the strength of concrete both in the laboratory and in-situ. In this paper the use of “twist-off” method for determining the strength of three types of fibre concrete is presented. In total 234 concrete samples were prepared, using three types of fibre (steel, glass and polypropylene) and their strength were measured using both “twist-off” and “compression” testing. The results show that a strong linear correlation exists between the compressive strength and the failure modulus with the results of the "twist-off" test. Also, to study the pattern of stresses in concrete, glue and cylinder of the "twist-off" test and the pattern of the formation and expansion of the cracks in concrete samples during the test, nonlinear modeling and finite elements were carried out using Abaqus/CAE. The finite element analysis with consideration of the nonlinear shape functions for the elements in tension and pressure on concrete specimens with a strength of 40 MPa shows that, with the distance of at least 20 mm, the results of the "twist-off" test and dispersion are not affected.Mahmood NaderiAlireza EsmaeliAli Saberi VarzanehIranian Society of Structrual Engineering (ISSE)articleconcretetwist-offfibrefailure modulusnonlinearBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 8, Iss 3, Pp 23-41 (2021)
institution	DOAJ
collection	DOAJ
language	FA
topic	concrete twist-off fibre failure modulus nonlinear Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	concrete twist-off fibre failure modulus nonlinear Bridge engineering TG1-470 Building construction TH1-9745 Mahmood Naderi Alireza Esmaeli Ali Saberi Varzaneh Assessment of the application "twist-off" method for determining the in situ compressive and flexural strengths in the fiber concrete
description	Since the batching, transportation, pouring, compaction and curing of the specimens used in laboratory testing of concrete, either from these employed in real structures, the in-situ methods are needed for assessing the quality of existing concrete in structures. Among the tests with partial failure, the "twist-off" method is used for determining the strength of concrete both in the laboratory and in-situ. In this paper the use of “twist-off” method for determining the strength of three types of fibre concrete is presented. In total 234 concrete samples were prepared, using three types of fibre (steel, glass and polypropylene) and their strength were measured using both “twist-off” and “compression” testing. The results show that a strong linear correlation exists between the compressive strength and the failure modulus with the results of the "twist-off" test. Also, to study the pattern of stresses in concrete, glue and cylinder of the "twist-off" test and the pattern of the formation and expansion of the cracks in concrete samples during the test, nonlinear modeling and finite elements were carried out using Abaqus/CAE. The finite element analysis with consideration of the nonlinear shape functions for the elements in tension and pressure on concrete specimens with a strength of 40 MPa shows that, with the distance of at least 20 mm, the results of the "twist-off" test and dispersion are not affected.
format	article
author	Mahmood Naderi Alireza Esmaeli Ali Saberi Varzaneh
author_facet	Mahmood Naderi Alireza Esmaeli Ali Saberi Varzaneh
author_sort	Mahmood Naderi
title	Assessment of the application "twist-off" method for determining the in situ compressive and flexural strengths in the fiber concrete
title_short	Assessment of the application "twist-off" method for determining the in situ compressive and flexural strengths in the fiber concrete
title_full	Assessment of the application "twist-off" method for determining the in situ compressive and flexural strengths in the fiber concrete
title_fullStr	Assessment of the application "twist-off" method for determining the in situ compressive and flexural strengths in the fiber concrete
title_full_unstemmed	Assessment of the application "twist-off" method for determining the in situ compressive and flexural strengths in the fiber concrete
title_sort	assessment of the application "twist-off" method for determining the in situ compressive and flexural strengths in the fiber concrete
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2021
url	https://doaj.org/article/def727891d094ae990d5cac0bdff9a59
work_keys_str_mv	AT mahmoodnaderi assessmentoftheapplicationtwistoffmethodfordeterminingtheinsitucompressiveandflexuralstrengthsinthefiberconcrete AT alirezaesmaeli assessmentoftheapplicationtwistoffmethodfordeterminingtheinsitucompressiveandflexuralstrengthsinthefiberconcrete AT alisaberivarzaneh assessmentoftheapplicationtwistoffmethodfordeterminingtheinsitucompressiveandflexuralstrengthsinthefiberconcrete
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Assessment of the application "twist-off" method for determining the in situ compressive and flexural strengths in the fiber concrete

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