Review of Self-sensing Capability of Ultra-high Performance Concrete

Lian, Jinkang; Hu, Chao; Fu, Tengfei; Wang, Yulin

doi:10.3389/fmats.2021.746022

Cited by 16 publications

(5 citation statements)

References 24 publications

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“…Materials that serve several functions simultaneously are called 'multifunctional' materials [1]. Cement-based composites can provide self-healing [2][3][4][5][6], self-cleaning [7][8][9][10][11], electromagnetic wave shielding [12][13][14][15][16] and self-sensing [17][18][19][20][21] properties as well as being a structural element. The sensing technology electrically reveals the stresses on the structure and allows to comment on the state of live or dead loads on the structure.…”

Section: Introductionmentioning

confidence: 99%

Capacitive compressive stress self-sensing behavior of cement mortar and its dependence on the thickness

Ozturk

2024

Phys. Scr.

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Capacitance based compressive stress/strain self-sensing properties and its dependence on thickness is presented for the fist time. Coplanar electrode configuration is used for the electrical measurements and known weights are used to create cyclic stresses on the mortar samples with different thicknesses. Mortar plates with 6 mm, 10 mm and 15 mm thicknesses are produced and capacitance change with stress application is measured with an inductance-capacitance-resistance meter (LCR meter). Capacitance value of the mortar with 6 mm, 10 mm and 15 mm thicknesses are 450 pF, 532 pF and 607 pF, respectively. Capacitance increases as thickness increases. However, stress sensitivities of the mortar with 6 mm, 10 mm and 15 mm thicknesses are measured as 3.1x10-6 P-1, 3.1x10-7 P-1 and 1.1x10-7 P-1. Stress sensitivity decreases with increasing the mortar thickness. While capacitive self-sensing is effective when the mortar thickness is known, capacitive self-sensing is ineffective with varying mortar thickness. This research contributes valuable insights into the practical application of capacitance-based sensing in materials subjected to compressive stresses, highlighting the need for considerations regarding thickness variations in real-world applications such as load monitoring and weighing.

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Section: Introductionmentioning

confidence: 99%

Capacitive compressive stress self-sensing behavior of cement mortar and its dependence on the thickness

Ozturk

2024

Phys. Scr.

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“…durability, which can effectively address the above issues and realize the real-time minoring [38][39][40][41]. In addition, it is worth noting that the conductive and self-sensing functions of SSUHPC are enhanced by the following key points: (1) The absence of coarse aggregates in the SSUHPC matrix allows for the favorable formation of conductive paths by the functional fillers [42].…”

Section: Introductionmentioning

confidence: 99%

Self-sensing ultra-high performance concrete: a review

Guo,

Wang,

Ashour

et al. 2023

Meas. Sci. Technol.

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Ultra-high performance concrete (UHPC) is an innovative cementitious composite, that has been widely applied in numerous structural projects because of its superior mechanical properties and durability. However, ensuring the safety of UHPC structures necessitates an urgent need for technology to continuously monitor and evaluate their condition during their extended periods of service. Self-sensing ultra-high performance concrete (SSUHPC) extends the functionality of UHPC system by integrating conductive fillers into the UHPC matrix, allowing it to address above demands with great potential and superiority. By measuring and analyzing the relationship between fraction change in resistivity (FCR) and external stimulates (force, stress, strain), SSUHPC can effectively monitor the crack initiation and propagation as well as damage events in UHPC structures, thus offering a promising pathway for structural health monitoring (SHM). Research on SSUHPC has attracted substantial interests from both academic and engineering practitioners in recent years, this paper aims to provide a comprehensive review on the state of the art of SSUHPC. It offers a detailed overview of material composition, mechanical properties and self-sensing capabilities, and the underlying mechanisms involved of SSUHPC with various functional fillers. Furthermore, based on the recent advancements in SSUHPC technology, the paper concludes that SSUHPC has superior self-sensing performance under tensile load but poor self-sensing performance under compressive load. The mechanical and self-sensing properties of UHPC are substantially dependent on the type and dosage of functional fillers. In addition, the practical engineering SHM application of SSUHPC, particularly in the context of large-scale structure, is met with certain challenges, such as environment effects on the response of SSUHPC. Therefore, it still requires further extensive investigation and empirical validation to bridge the gap between laboratory research and real engineering application of SSUHPC.

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“…Those engineering properties may prevent the initiation of microcrack formation in the cementitous matrix, even at very early ages [25]. Previous studies revealed that CNTs, namely MWCNTs, improved the mechanical behaviour and durability properties of cement-based composites [26][27][28][29][30][31][32][33][34][35][36][37]. However, most of those studies concern conventional cement-based paste or mortar; those conclusions cannot be directly drawn to advanced concrete material families such as HPC or UHPC.…”

Section: Introductionmentioning

confidence: 99%

Studying the Incorporation of Multi-Walled Carbon Nanotubes in High-Performance Concrete

Mesquita,

Matos,

Sousa

et al. 2023

Sustainability

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The current work aimed to study nanomodified HPC with multi-walled carbon nanotubes (MWCNT). The effect of MWCNT concentration, from 0% to 0.6% of cement weight, was evaluated on HPC multi-level output properties, namely, the flowability, mechanical strength, electrical resistivity, and microstructure. In addition, a tentative, simplified, and more cost-effective method based on dispersion of a high-pH solution of hydroxide was also adapted to disperse the MWCNT before incorporation in fresh HPC mixtures. Adding 0.2–0.6% MWCNT reduced HPC workability even with a higher superplasticiser dosage. The electrical resistivity was 484.58 Ω m for the HPC without MWCNT at 28 days of curing, while the samples with 0.2%, 0.4%, and 0.6% MWCNT presented 341.41 Ω m, 363.44 Ω m, and 360.34 Ω m, respectively. The use of 0.2–0.6% MWCNT in HPC decreased the flexural and compressive strength by 20% and 30%, respectively. The HPC performance decrease with MWCNT seemed to be related to relatively significant agglomerations of the long MWCNTs, namely, in HPC-0.6% samples. New developments are needed to state a simple and cost-effective dispersion method for MWCNT incorporation in HPC. In addition, smaller dosages of MWCNT are suggested for future research works.

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Review of Self-sensing Capability of Ultra-high Performance Concrete

Cited by 16 publications

References 24 publications

Capacitive compressive stress self-sensing behavior of cement mortar and its dependence on the thickness

Capacitive compressive stress self-sensing behavior of cement mortar and its dependence on the thickness

Self-sensing ultra-high performance concrete: a review

Studying the Incorporation of Multi-Walled Carbon Nanotubes in High-Performance Concrete

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