Real fracture toughness of FRC and FGC: size and boundary effects

Elakhras, A. A.; Saleem, M. H.; Sallam, H. E. M.

doi:10.1007/s43452-022-00424-6

Artykuł - szczegóły

Tytuł artykułu

Real fracture toughness of FRC and FGC: size and boundary effects

Autorzy

Elakhras A. A. , Saleem M. H. , Sallam H. E. M.

Wybrane pełne teksty z tego czasopisma

http://www.springer.com/journal/43452

Identyfikatory

DOI

10.1007/s43452-022-00424-6

Warianty tytułu

Języki publikacji

Abstrakty

The present dilemma is how to simulate the real crack in full depth (FD) fiber-reinforced concrete (FRC), FD FRC, to get the actual fracture toughness of such fibrous composites, i.e., through-thickness pre-cracks are inappropriate for such materials. To overcome this dilemma, a new technique was adopted to create a pre-matrix crack (MC) without cutting the fibers bridging the two surfaces of the pre-crack. The main objective of the present work is to study the size and boundary effects on the real fracture toughness of MC-FD FRC and functionally graded concrete (FGC). Forty-eight MC-FD FRC and MC-FGC beams with three different span to depth ratios L/d equal 4, 5, and 6, and three different beam depths of the same beam span have been tested under three-point bending. All beams have the same pre-MC length to beam depth ratio (ao /d) of 1/3. Hooked end steel fibers of 1% fiber volume fraction produced FRC. FGC beams consist of three equal layers, FRC layer at the tension side, normal strength concrete layer at the middle of the beam, and high strength concrete layer at the compression side. The applied load versus all beams' crack mouth opening displacement (CMOD) curves have been analyzed. The present load/ CMOD results showed that beams having constant L/d ratios are recommended to capture independent size effect parameters. The size effect law (SEL) and boundary effect model (BEM) are good candidates to predict the size effect. According to the maximum non-damaged defect concept, the SEL is more reliable in predicting MC FD FRC fracture toughness than BEM.

Słowa kluczowe

strength of concrete matrix crack normal strength concrete fiber-reinforced concrete high strength concrete functionally graded concrete boundary effect model

wytrzymałość betonu pęknięcia beton o normalnej wytrzymałości beton zbrojony włóknami betony wysokiej wytrzymałości

Wydawca

Springer
Wrocław University of Science and Technology

Czasopismo

Archives of Civil and Mechanical Engineering

Rocznik

2022

Tom

Vol. 22, no. 2

Strony

art. no. e99, 1--17

Opis fizyczny

Bibliogr. 60 poz., il., tab., wykr.

Twórcy

autor

Elakhras A. A.

Materials Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt

autor

Saleem M. H.

Materials Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt

autor

Sallam H. E. M.

hem_sallam@yahoo.com

Materials Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt

https://orcid.org/0000-0001-9217-9957

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)

Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-13c21551-c4cd-401b-9024-77acbfc0473a