A state-of-the-art on self-sensing concrete: Materials, fabrication and properties

Tian, Zhuang; Li, Yancheng; Zheng, Jiajia; Wang, Shuguang

doi:10.1016/j.compositesb.2019.107437

Cited by 140 publications

(72 citation statements)

References 136 publications

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“…Indeed, in the last decades, structural health monitoring (SHM), i.e., systems and structures that can monitor their own structural integrity, attracted popularity in the civil engineering community [10][11][12][13]. Compared to conventional techniques such as in-situ inspections or non-destructive testing (NDT), strain-sensitive sensors represent the latest developed smart systems for structures.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

et al. 2020

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Polypropylene/carbon nanotubes (PP/CNTs) nanocomposites with different CNTs concentrations (i.e., 1, 2, 3, 5 and 7 wt%) were prepared and tested as strain gauges for structures monitoring. Such sensors were embedded in cementitious mortar prisms and tested in 3-point bending mode recording impedance variation at increasing load. First, thermal (differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA)), mechanical (tensile tests) and morphological (FE-SEM) properties of nanocomposites blends were assessed. Then, strain-sensing tests were carried out on PP/CNTs strips embedded in cementitious mortars. PP/CNTs nanocomposites blends with CNTs content of 1, 2 and 3 wt% did not show significant results because these concentrations are below the electrical percolation threshold (EPT). On the contrary, PP/CNTs nanocomposites with 5 and 7 wt% of CNTs showed interesting sensing properties. In particular, the best result was highlighted for the PP/CNT nanocomposite with 5 wt% CNTs for which an average gauge factor (GF) of approx. 1400 was measured. Moreover, load-unload cycles reported a good recovery of the initial impedance. Finally, a comparison with some literature results, in terms of GF, was done demonstrating the benefits deriving from the use of PP/CNTs strips as strain-gauges instead of using conductive fillers in the bulk matrix.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

et al. 2020

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“…Other novel properties of cement-based materials containing nanomaterials are their low electrical resistivity and self-sensing capabilities [73]. For instance, cement-based composites with CNTs have strain-sensing abilities, which may allow the measurement of their electrical resistance under applied loads [74]. It represents an advantage to obtain strain-sensing concrete structure systems for structural health monitoring [75,76].…”

Section: Introductionmentioning

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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“…At this stage damage to the matrix has begun in the form of cracks and defects. This leads to the destruction and reconstruction of the conductive network and ultimately reaching a state of balance [2,126]. (3) Severe damage: Lastly, the third region of monotonic compression is associated with severe damage to the matrix as the cracks continue to expand and the performance is being compromised.…”

Section: Monotonic Loadingmentioning

confidence: 99%

“…In a civil engineering context, self-sensing materials are components that can simultaneously detect measurands without the need of additional sensing instruments. Such materials include self-sensing cementitious materials [1,2], bricks [3,4], aggregates [5,6] and pavements [7,8]. In terms of self-sensing cementitious materials, extensive research has been carried out in both ordinary Portland cement (OPC) and alkali activated materials (AAM).…”

Section: Introductionmentioning

confidence: 99%

“…There are already numerous reviews on self-sensing cementitious materials in general [1,2,28], and on multifunctional AAM [29], but there are currently no reviews that detail the self-sensing aspects B. Filler in sodium hydroxide: The conductive filler is added only to the sodium hydroxide solution, which is subsequently mixed and sonicated. The silicate-based solution and the precursor are added from there on [54][55][56][57].…”

Section: Introductionmentioning

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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A state-of-the-art on self-sensing concrete: Materials, fabrication and properties

Cited by 140 publications

References 136 publications

Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring

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

Self-Sensing Alkali-Activated Materials: A Review

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