Self-sensing capability of ultra-high-performance concrete containing steel fibers and carbon nanotubes under tension

Yoo, Doo-Yeol; Kim, Soonho; Lee, Seung Ho

doi:10.1016/j.sna.2018.04.009

Cited by 122 publications

(57 citation statements)

References 32 publications

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“…Likewise, under tension the resistance of the specimen increases. This behaviour has been widely reported in both AAM [24][25][26]52,57,92] and OPC [106,[117][118][119][120]…”

Section: Loading Schemessupporting

confidence: 73%

“…The sensing response is different for tension and compression: not just in its sign. Under tension, resistance tends to increase in a quasi-linear manner [119]. In compression, however, the response of the substrate differs and can be typically broken down into three regions depending on the loading amplitude, as illustrated in Figures 4a and 5:…”

Section: Monotonic Loadingmentioning

confidence: 99%

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Self-Sensing Alkali-Activated Materials: A Review

2020

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Alkali-activated materials are an emerging technology that can serve as an alternative solution to ordinary Portland cement. Due to their alkaline nature, these materials are inherently more electrically conductive than ordinary Portland cement, and have therefore seen numerous applications as sensors and self-sensing materials. This review outlines the current state-of-the-art in strain, temperature and moisture sensors that have been developed using alkali activated materials. Sensor fabrication methods, electrical conductivity mechanisms, and comparisons with self-sensing ordinary Portland cements are all outlined to highlight best practice and propose future directions for research.

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“…Likewise, under tension the resistance of the specimen increases. This behaviour has been widely reported in both AAM [24][25][26]52,57,92] and OPC [106,[117][118][119][120]…”

Section: Loading Schemessupporting

confidence: 73%

Section: Monotonic Loadingmentioning

confidence: 99%

Self-Sensing Alkali-Activated Materials: A Review

2020

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“…Recently, several researchers [109,110,111,112,113,114,115,116,117,118,119,120,121,122,123] have reported the effects of CNTs on the electrical and mechanical properties of concrete samples. For instance, CNTs can decrease the formation and growth of micro-cracks in concrete.…”

Section: Nanomaterials In Cement-based Materialsmentioning

confidence: 99%

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

et al. 2019

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Modern concrete infrastructure requires structural components with higher mechanical strength and greater durability. A solution is the addition of nanomaterials to cement-based materials, which can enhance their mechanical properties. Some such nanomaterials include nano-silica (nano-SiO2), nano-alumina (nano-Al2O3), nano-ferric oxide (nano-Fe2O3), nano-titanium oxide (nano-TiO2), carbon nanotubes (CNTs), graphene and graphene oxide. These nanomaterials can be added to cement with other reinforcement materials such as steel fibers, glass, rice hull powder and fly ash. Optimal dosages of these materials can improve the compressive, tensile and flexural strength of cement-based materials, as well as their water absorption and workability. The use of these nanomaterials can enhance the performance and life cycle of concrete infrastructures. This review presents recent researches about the main effects on performance of cement-based composites caused by the incorporation of nanomaterials. The nanomaterials could decrease the cement porosity, generating a denser interfacial transition zone. In addition, nanomaterials reinforced cement can allow the construction of high-strength concrete structures with greater durability, which will decrease the maintenance requirements or early replacement. Also, the incorporation of nano-TiO2 and CNTs in cementitious matrices can provide concrete structures with self-cleaning and self-sensing abilities. These advantages could help in the photocatalytic decomposition of pollutants and structural health monitoring of the concrete structures. The nanomaterials have a great potential for applications in smart infrastructure based on high-strength concrete structures.

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“…Sonication is most commonly used for dispersing nanoscale admixtures such as carbon nanotube [34][35][36], but it is not practical for field application. The growth of carbon nanotubes on the surface of cement particles is a method of dispersion that is very expensive, due to the elevated temperature and controlled atmosphere required for the growth [37].…”

Section: Electrically Conductive Admixturesmentioning

confidence: 99%

Self-sensing concrete: from resistance-based sensing to capacitance-based sensing

Chung

2020

International Journal of Smart and Nano Materials

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Self-sensing uses the cement-based material without sensor incorporation to sense itself. This paper reviews self-sensing cementbased materials, with coverage of the well-studied resistance-based sensing as well as the less-studied capacitance-based sensing. This review is the first that covers capacitance-based self-sensing. Capacitance-based sensing is advantageous over resistance-based sensing in that no particular admixture is required, so that it is applicable to both existing and new structures. In contrast, resistance-based sensing that is comparable to capacitance-based sensing in stress/strain sensitivity requires conductive admixtures, such as carbon fiber. Resistance-based strain sensing is based on piezoresistivity, which is associated with the resistance increasing upon tension and decreasing upon compression. Capacitance-based strain sensing is based on piezopermittivity, which is associated with the permittivity decreasing upon tension and increasing upon compression. Damage causes the resistance to increase and causes the permittivity to decrease. Increase in temperature decreases the resistance but increases the permittivity. This review also covers the methodology of the electrical measurements.

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Self-sensing capability of ultra-high-performance concrete containing steel fibers and carbon nanotubes under tension

Cited by 122 publications

References 32 publications

Self-Sensing Alkali-Activated Materials: A Review

Self-Sensing Alkali-Activated Materials: A Review

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

Self-sensing concrete: from resistance-based sensing to capacitance-based sensing

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