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      Enhancing Damage-Sensing Capacity of Strain-Hardening Macro-Steel Fiber-Reinforced Concrete by Adding Low Amount of Discrete Carbons

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          Abstract

          The effects of adding micro-carbon fibers on the electro-mechanical response of macro-steel fiber-reinforced concretes (MSFRCs) under tension were investigated. Two MSFRCs were investigated and they had identical mortar matrix but different fiber contents: MSFRC1 and MSFRC2 contained 1.0 and 1.5 vol.% fibers, respectively. The volume contents of added micro-carbon fibers were 0 to 1.5 vol.% in MSFRC1 and 0 to 0.75 vol.% in MSFRC2, respectively. The addition of 0.5 vol.% micro-carbon fibers, in both MSFRC1 and MSFRC2, produced significantly enhanced damage-sensing capability and still retained their strain-hardening performance together with multiple micro cracks. However, when the content of carbon fibers was more than 0.5 vol.%, the MSFRCs generated tensile strain-softening behavior and reduced damage-sensing capability. Furthermore, the effects of temperature and humidity on the electrical resistivity of MSFRCs were investigated, as were the effects of adding multi-walled carbon nanotubes on the damage-sensing capability of MSFRCs.

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          Tensile behavior of Ultra High Performance Hybrid Fiber Reinforced Concrete

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            Embedded piezoresistive cement-based stress/strain sensor

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              Piezoresistive Cement-Based Materials for Strain Sensing

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                21 March 2019
                March 2019
                : 12
                : 6
                : 938
                Affiliations
                [1 ]Lecturer, Faculty of Civil Engineering, Ho Chi Minh City University of Technology and Education, 01 Vo Van Ngan St, Thu Duc District, Ho Chi Minh City 700000, Vietnam
                [2 ]Department of Civil and Environmental Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea; djkim75@ 123456sejong.ac.kr (D.-J.K.); thaiduckien@ 123456sejong.ac.kr (D.-K.T.)
                Author notes
                [* ]Correspondence: liemnd@ 123456hcmute.edu.vn ; Tel: +84-28-3950-2299
                Author information
                https://orcid.org/0000-0001-7176-1518
                https://orcid.org/0000-0003-2714-8737
                Article
                materials-12-00938
                10.3390/ma12060938
                6470478
                30901852
                f476c081-5d4a-4b4f-91bd-f8ba76ee89bc
                © 2019 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/).

                History
                : 14 February 2019
                : 18 March 2019
                Categories
                Article

                smart materials,electro-mechanical,resistivity,damage-sensing,hybrid fiber

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