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      Fiber interfacial transition zone concept for steel fiber-reinforced concrete by SEM observation

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          Abstract

          Abstract: Fiber-reinforced concrete (FRC), which has become quite popular in recent years, improves many of concrete’s mechanical properties. It uses fibers discretely and is utilized in different structures. This paper proposes, between steel fibers and concrete, a fiber interfacial transition zone (FITZ) which is the most vulnerable part of steel FRC (SFRC) because it has a high cracking and microcracking potential due to fiber-concrete separation. In the prepared specimens, steel fibers were added to concrete in hooked and twisted forms, the SFRC microstructure was studied in both cases under a scanning electron microscope (SEM), and the related images were compared as secondary electron (SE) images. The SEM analysis showed highly precise images of the cracks and their microstructures in the FITZ and lab results show that the newly defined FITZ illustrates the cracking patterns well for both fiber types. Because twisted fibers have cracking angles and larger contact surfaces, the concrete-fiber bond is increased and the related crack widths decrease considerably. A comparison of the crack widths showed that those in the FITZ of specimens with twisted fibers decreased by a factor of approximately seven compared to those with hooked fibers.

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          The ITZ in concrete – a different view based on image analysis and SEM observations

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            Estimation of the optimum content of fly ash in concrete composite based on the analysis of fracture toughness tests using various measuring systems

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              Design and performance evaluation of ultra-lightweight geopolymer concrete

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                Author and article information

                Journal
                jart
                Journal of applied research and technology
                J. appl. res. technol
                Universidad Nacional Autónoma de México, Instituto de Ciencias Aplicadas y Tecnología (Ciudad de México, Ciudad de México, Mexico )
                1665-6423
                2448-6736
                2021
                : 19
                : 4
                : 294-307
                Affiliations
                [1] orgnameVelayat University orgdiv1Department of Civil Engineering Iran
                [2] orgnameSemnan University orgdiv1Department of Civil Engineering Iran
                Article
                S1665-64232021000400294 S1665-6423(21)01900400294
                10.22201/icat.24486736e.2021.19.4.1024
                ca74ac06-84df-465a-b81d-2b454f74e609

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

                History
                : 16 January 2021
                : 16 May 2020
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 22, Pages: 14
                Product

                SciELO Mexico

                Categories
                Articles

                Crack,ITZ,Microstructure,FITZ,SFRC
                Crack, ITZ, Microstructure, FITZ, SFRC

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