Piezoresistive behavior of CF- and CNT-based reinforced concrete beams subjected to static flexural loading: Shear failure investigation

Yıldırım, Gürkan; Sarwary, Mohammad Haroon; Al-Dahawi, Ali; Öztürk, Oğuzhan; Anıl, Özgür; Şahmaran, Mustafa

doi:10.1016/j.conbuildmat.2018.02.124

Cited by 110 publications

(34 citation statements)

References 29 publications

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“…Currently, carbon nanofibres (CNFs), carbon nanotubes (CNTs), and graphite nanoplatelets (GNPs) are incorporated into cementitious materials to produce intrinsic self-sensing cementitious materials to develop self-sensing cement composites. Currently, most studies focus on type and dosage of additives, mixing method, and selfsensing ability of materials or structures [1][2][3][4][5][6][7][8][9][10]. Studies show that the resistivity and piezoresistivity of the CNTcement composite depend on the conductivity network in the composite.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Self-Sensing Properties of Multiwalled Carbon Nanotube-Reinforced ECCs

Liu¹,

Liu²,

et al. 2019

Advances in Materials Science and Engineering

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is paper investigates the effect of type and dosage of multiwalled carbon nanotubes (MWCNTs) on the mechanical and selfsensing properties of engineered cementitious composites (ECCs). Two types of MWCNTs (MWCNTa and MWCNTb) were employed. e tensile and flexural strengths of CNT-reinforced ECCs were improved compared with normal ECCs, while the ultimate tensile strain and midspan deflection were reduced. Compared with the dosage of MWCNTs, the type had less effect on these properties. e percolation threshold was around 0.3 wt.%. ECCs containing MWCNTs had good self-sensing ability under different loading conditions. When the midspan deflection increased from 0.1 to 0.6 mm, the fractional change in resistivity reached 9%. e dosage of MWCNTs had a significant effect on the self-sensing ability. As the MWCNT content increased, the amplitude of fractional change in resistivity decreased.

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Section: Introductionmentioning

confidence: 99%

Mechanical and Self-Sensing Properties of Multiwalled Carbon Nanotube-Reinforced ECCs

Liu¹,

Liu²,

et al. 2019

Advances in Materials Science and Engineering

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“…The self-diagnosis property is a function of the test conditions and the optimal dosage of concrete with the self-sensing additives and the electrical resistivity of the concrete matrix, shown in Figures 7 and 8. In this work, hybrid self-sensing concrete has been used with the aim of covering the deformations in the concrete induced by compressive external loads from the nanoscale to the microscale. Aspreviously mentioned, there is a lack of information on self-sensing capabilities in concrete [24,28]. Concreteis a much more complex system than a simple cement paste asit contains aggregatesof different sizes.…”

Section: The Self-diagnosis Sensitivity Of Scc Reinforced With the Hymentioning

confidence: 99%

“…The use of concrete for this type of application is a challenge, but its great versatilityworks in its favour when selecting components to improve heat performance, adapting the design to usage (CB) [18], CNT or CNF [19][20][21][22][23], and CF or CMF [24][25][26]. Usually, individual additions of the self-sensing additive are used; the incorporation in mixes such as hybrid additives [27,28] is less common.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies of PZR related to self-sensing assessment have been conducted in cement paste [15,[18][19][20][21][22][23] in contrast to those dedicated to mortar or concrete [24,26,28]. Concrete has a more complex and heterogeneous composite structure due to its multi-size components.…”

Section: Introductionmentioning

confidence: 99%

“…The modification of the electrical resistivity of concrete with the incorporation of conductive additives has added a self-diagnostic property of the mechanical damage of concrete [15,16]. Interest in cementitious materials reinforced with CNT or CF has increased in recent yearsdue to agrowing interest in the capability of concrete structures to self-diagnose.The self-sensing property in cementitious materials is usually assessed by measuring the electrical resistivity changes in the matrix caused by the incorporation of the conductive additive [17] and with piezoresistivity (PZR) [15,[18][19][20][21][22][23][24][25][26][27][28]. PZR is defined as the property that some conductive or semi-conductive materials show when subjected to external strains that induce changes in the material related to the variation of its electrical resistance [18].…”

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confidence: 99%

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Self-Compacted Concrete with Self-Protection and Self-Sensing Functionality for Energy Infrastructures

Alonso

Puentes

2020

Materials

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This paper aims to demonstrate the self-protection and self-sensing functionalities of self-compacted concrete (SCC) containing carbon nanotubes (CNT) and carbon microfibers (CMF) in a hybrid system. The ability for self-sensing at room temperature and that of self-protection after thermal fatigue cycles is evaluated. A binder containing a high volume of supplementary mineral additions (30%BFSand20%FA) and different type of aggregates (basalt, limestone, and clinker) are used. The self-diagnosis is assessed measuring electrical resistivity (ER) and piezoresistivity (PZR) in compression mode within the elastic region of the concrete. Thermal fatigue is evaluated with mechanical and crack measurements after heat cycles (290–550 °C). SCC withstands high temperature cycles. The protective effect of the hybrid additive (CNT+CMF) notably diminishes damage by keepinghigher residual strength and lessmicrocracking of the concrete. Significant reductions in ER are detected. The self-diagnosis ability of functionalized SCC isconfirmed with PZR. A content of the hybrid functional additive (CNT+CMF) in the percolation region is recommended to maximize the self-sensing sensitivity. Other parameters as sample geometry, sensor location, power supply, and load level have less influence.

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Engineering performance of reinforced lightweight geopolymer concrete beams produced by ambient curing

Öztürk

2021

Structural Concrete

Self Cite

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The use of lightweight concrete can provide specific advantages that are favoring for mitigating seismic risk in building design. On the other hand, a significant reduction of carbon footprint could be possible through the use of geopolymer concrete. However, geopolymer concrete is mostly assessed through small specimens without reinforcement elements. This paper aims to couple the advantage of lightweight mixtures and ambient-cured geopolymerization in reinforced beams. To do this, engineering performance of reinforced lightweight geopolymer concrete was extensively investigated with different aspects. In mixtures, pumice and volcanic tuff aggregates were used with an appropriate gradation. Flexural strength, deflection capacities, initial stiffness, ductility, and energy dissipation capacity of reinforced geopolymer beams were investigated with the proposed configuration. Compressive strength and unit weight of the developed mixtures were also evaluated to meet design requirements for lightweight concrete. Results indicated that certain engineering properties (energy dissipation capacity and initial stiffness) of developed lightweight geopolymer concrete were considerably comparable with lightweight Portland cement-based concrete. Although compressive strength and unit weight of the developed geopolymer mixtures were satisfying, microstructural analysis indicated a weak bonding behavior between paste and lightweight aggregates.

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Piezoresistive behavior of CF- and CNT-based reinforced concrete beams subjected to static flexural loading: Shear failure investigation

Cited by 110 publications

References 29 publications

Mechanical and Self-Sensing Properties of Multiwalled Carbon Nanotube-Reinforced ECCs

Mechanical and Self-Sensing Properties of Multiwalled Carbon Nanotube-Reinforced ECCs

Self-Compacted Concrete with Self-Protection and Self-Sensing Functionality for Energy Infrastructures

Engineering performance of reinforced lightweight geopolymer concrete beams produced by ambient curing

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