Carbon nanotube polymer nanocomposites coated aggregate enabled highly conductive concrete for structural health monitoring

Lu, Dong; Huo, Yanlin; Jiang, Zuowen; Zhong, Jing

doi:10.1016/j.carbon.2023.02.043

Cited by 52 publications

(8 citation statements)

References 54 publications

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“…To address these challenges and requirements, several studies have attempted to develop novel self-sensing nanocomposites for such applications [19][20][21][22]. Lu et al [23] manufactured conductive aggregates coated with CNT polymer nanocomposites and evaluated their sensitivity to deformations in concrete structures caused by external factors. They used materials coated with CNT polymer nanocomposites at a 20 wt% CNT content to compare the electrical resistivity under cyclic compressive loads.…”

Section: Introductionmentioning

confidence: 99%

Crack Detection of Reinforced Concrete Structure Using Smart Skin

Jung,

Jang

2024

Nanomaterials

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The availability of carbon nanotube (CNT)-based polymer composites allows the development of surface-attached self-sensing crack sensors for the structural health monitoring of reinforced concrete (RC) structures. These sensors are fabricated by integrating CNTs as conductive fillers into polymer matrices such as polyurethane (PU) and can be applied by coating on RC structures before the composite hardens. The principle of crack detection is based on the electrical change characteristics of the CNT-based polymer composites when subjected to a tensile load. In this study, the electrical conductivity and electro-mechanical/environmental characterization of smart skin fabricated with various CNT concentrations were investigated. This was performed to derive the tensile strain sensitivity of the smart skin according to different CNT contents and to verify their environmental impact. The optimal CNT concentration for the crack detection sensor was determined to be 5 wt% CNT. The smart skin was applied to an RC structure to validate its effectiveness as a crack detection sensor. It successfully detected and monitored crack formation and growth in the structure. During repeated cycles of crack width variations, the smart skin also demonstrated excellent reproducibility and electrical stability in response to the progressive occurrence of cracks, thereby reinforcing the reliability of the crack detection sensor. Overall, the presented results describe the crack detection characteristics of smart skin and demonstrate its potential as a structural health monitoring (SHM) sensor.

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Section: Introductionmentioning

confidence: 99%

Crack Detection of Reinforced Concrete Structure Using Smart Skin

Jung,

Jang

2024

Nanomaterials

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“…Pumice and perlite used as fine aggregates have been experimentally shown to have good freeze–thaw resistance in their concrete mixtures which can better improve the durability of concrete [ 5 ]. Dong Lu et al also significantly reduced the cost of concrete by using conductive aggregates to enhance the durability of concrete [ 6 ]. As an important method to evaluate the strength distribution of materials, the Monte Carlo simulation (MCS) method can further analyze the statistical correlations at macroscopic and mesoscopic scales [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Curing Temperature on CH-Based Fly Ash Composites

Takasu

Suyama

et al. 2023

Materials

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Curing temperature affects the compressive strength of cement paste systems via the pozzolanic reaction. However, different processes, climates, and weather conditions often result in different initial curing temperatures. The relationship between curing temperature and compressive strength is still an underexplored domain. To explore the effect of curing temperature on calcium hydroxide (CH)-based fly ash composites, fly ashes from different carbon sources were used to make CH-based composites, and the compressive strength, reaction rate, CH content, and C-S-H generation were analyzed. The correlation between the reaction rate and C-S-H content was analyzed. High-temperature curing improved the compressive strength of the cement paste system by affecting the CH-based reaction rate in the initial stage, with the highest initial reaction rate reaching 28.29%. However, after cooling to constant temperature, high-temperature curing leads to a decrease in CH and C-S-H content. The average decrease rate of calcium hydroxide content under high temperature curing is 38%, which is about 2.38 times that of room-temperature curing conditions. This led to a decrease in the compressive strength of the cement paste. Therefore, the performance of CH-based fly ash composites produced by low-temperature curing was superior to that of composites produced by high-temperature curing.

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“…This leads to the corrosion of operational facilities, impacts the serviceability of the tunnel, and, in extreme cases, can result in casualties and economic losses [ 2 ]. In regions with complex geology and hydrology, corrosive ions can infiltrate the concrete lining with water, causing the corrosion of steel bars, which subsequently impairs the durability and load-bearing capacity of the lining structure [ 3 ]. As a result, it is crucial to focus on the impermeability and crack resistance of concrete during the construction process of tunnel engineering [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Research and Development of Self-Waterproofing Concrete for Tunnel Lining Structure and Its Impermeability and Crack Resistance Characteristics

Zhou

et al. 2023

Materials

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This research paper systematically investigates the combined influence of fly ash, cementitious capillary crystalline waterproofing (CCCW) materials, and polypropylene fibers on the mechanical properties and impermeability of concrete through comprehensive orthogonal tests. Microscopic morphological changes in the concrete induced by different composite materials are examined via scanning electron microscopy (SEM) and X-ray diffraction (XRD) testing. The objective is to facilitate a beneficial synergetic interaction among these materials to develop highly permeable, crack-resistant concrete. Key findings of this study are: (1) The study unveils the impact of the concentration of three additive materials on the concrete’s compressive strength, tensile strength, and penetration height, thereby outlining their significant influence on the mechanical properties and impermeability of the concrete; (2) An integrated scoring method determined the optimal composite dosage of three materials: 15% fly ash, 2% CCCW, and polypropylene fibers at 1.5 kg/m3. This combination increased the concrete’s compressive strength by 12.5%, tensile strength by 48.4%, and decreased the average permeability height by 63.6%; (3) The collective introduction of these three materials notably augments the hydration reaction of the cement, resulting in denser concrete microstructure, enhanced bonding between fibers and matrix, and improved concrete strength and durability.

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Carbon nanotube polymer nanocomposites coated aggregate enabled highly conductive concrete for structural health monitoring

Cited by 52 publications

References 54 publications

Crack Detection of Reinforced Concrete Structure Using Smart Skin

Crack Detection of Reinforced Concrete Structure Using Smart Skin

The Effects of Curing Temperature on CH-Based Fly Ash Composites

Research and Development of Self-Waterproofing Concrete for Tunnel Lining Structure and Its Impermeability and Crack Resistance Characteristics

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