A pressure-sensitive carbon black cement composite for traffic monitoring

Monteiro, André Oliveirinha; Loredo, Alexandre; Costa, Pedro M. F. J.; Oeser, Markus; Cachim, Paulo

doi:10.1016/j.conbuildmat.2017.08.053

Cited by 109 publications

(63 citation statements)

References 36 publications

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“…The high electrical resistance of a concrete induces a current drop. This phenomenon is identified by some authors as a consequence of the polarization of the ions of the water pore solution under the electrical field [16,18,23]. The drop in current takes a certain amount of time to reach a stateof equilibriumonce the electrical field is applied.…”

Section: Self-sensing Testsmentioning

confidence: 99%

“…For solar energy, in the case of solar thermal electricity (STE), the concrete has been considered for the heat storage system, and the severe operating conditions are the high temperatures it has to withstand [2]. 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].…”

mentioning

confidence: 99%

“…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]. PZR is also applicable to cementitious materials that can be enhanced by the incorporation of functional additives to reduce electrical resistivity.…”

mentioning

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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Section: Self-sensing Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

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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An electronic textile embedded smart cementitious composite

Irfan

Ali

Khan

et al. 2021

Engineering Reports

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Structural health monitoring (SHM) using self‐sensing cement‐based materials has been reported before, where nano‐fillers have been incorporated in cementitious matrices as functional sensing elements. A percolation threshold is always required in order for conductive nano‐fillers modified concrete to be useful for SHM. Nonetheless, the best pressure/strain sensitivity results achieved for any self‐sensing cementitious matrix are <0.01 MPa−1. In this work, we introduce for the first‐time novel partially reduced graphene oxide based electronic textile (e‐textile) embedded in plain and as well as in polymer‐binder‐modified cementitious matrix for SHM applications. These e‐textile embedded cementitious composites are independent of any percolation threshold due to the interconnected fabric inside the host matrix. The piezo‐resistive response was measured by applying direct and cyclic compressive loads (ranging from 0.10 to 3.90 MPa). A pressure sensitivity of 1.50 MPa−1 and an ultra‐high gauge factor of 2000 was obtained for the system of the self‐sensing cementitious structure with embedded e‐textiles. The sensitivity of this new system with embedded e‐textile is an order of magnitude higher than the state‐of‐the‐art nanoparticle based self‐sensing cementitious composites. The composites showed mechanical stability and functional durability over long‐term cyclic compression tests of 1000 cycles. Additionally, a two time‐constant model was used to validate the experimental results on decay response of the e‐textile embedded composites.

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Mechanical and conductive performance of electrically conductive cementitious composite using graphite, steel slag, and GGBS

Qin

Sun

et al. 2020

Structural Concrete

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Electrically conductive cementitious composite (ECCC) can be utilized in traffic detection, structural health monitoring (SHM), and pavement deicing. Graphite is a popular conductive filler given its outstanding electrical resistance behavior, but its flat micro‐surface decreases the friction resistance, reducing mechanical strength. However, slag solids can substitute part of the graphite with their considerable conductivity and superior mechanical characteristics. In this research, 27 ECCC composites are developed incorporated by combined graphite powder (GP), blast furnace slag (GGBS), and steel slag (SS). Flexural, unconfined compressive strength (UCS) experiments, and resistance experiments with failure mode evaluations are carried out to explore the influence of proposed conductive fillers with different fractions. Results show the graphite strongly improves conductivity but dramatically reduces mechanical performance. Both steel slag and GGBS reduced the compressive and flexural strength after their replacement ratio exceeded 20%. Additionally, compared with GGBS, SS demonstrated a better influence on mechanical and conductive performance. A 15 wt% ratio of GGBS, 20 wt% of SS, and 4 wt% of GP are explored as the optimum design with 3.4 MPa of flexural strength, 36 MPa of compressive strength, and 7,779 Ω cm of resistance. Lastly, a microstructural investigation is conducted to explore the mechanical and conductive mechanism of ECCC.

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A pressure-sensitive carbon black cement composite for traffic monitoring

Cited by 109 publications

References 36 publications

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

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

An electronic textile embedded smart cementitious composite

Mechanical and conductive performance of electrically conductive cementitious composite using graphite, steel slag, and GGBS

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