Effects of temperature and humidity on self-stress sensing capacity of smart concrete blocks

Kim, Tae Uk; Kim, Min Kyoung; Park, Jong Woong; Kim, Dong Joo

doi:10.1016/j.jobe.2023.106227

Cited by 4 publications

(2 citation statements)

References 37 publications

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“…They demonstrated that the electrical resistance of sensors processed under wet conditions tends to rise with processing age, whereas it remains stable for sensors processed in dry air. Furthermore, the literature extensively addresses the impact of temperature [42], humidity [43], types of loading [44], dispersion methods [45], electrical resistance measurement setups [46], and diverse additives like hydrophobic materials [47] on the sensing capabilities of various cementitious materials, encompassing mortar, concrete, and cement paste. However, there remains a notable dearth of studies focusing on cementitious geocomposites such as stabilized soils.…”

Section: Introductionmentioning

confidence: 99%

Influence of cement and water content on the multifaceted capabilities of a self-sensing cement-based geocomposite: a comprehensive analysis

Abedi,

Roshan,

Adresi

et al. 2024

Meas. Sci. Technol.

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This study investigates the synergistic effects of cement, water, and hybrid carbon nanotubes/graphene nanoplatelets (CNT/GNP) concentrations on the mechanical, microstructural, durability, and piezoresistive properties of self-sensing cementitious geocomposites. Varied concentrations of cement (8% to 18%), water (8% to 16%), and CNT/GNP (0.1% to 0.34%, 1:1) were incorporated into cementitious stabilized sand (CSS). Mechanical characterization involved compression and flexural tests, while microstructural analysis utilized dry density, apparent porosity, water absorption, and non-destructive ultrasonic testing, alongside TGA, SEM, EDX, and XRD analyses. The durability of the composite was also assessed against 180 Freeze-thaw cycles. Moreover, the piezoresistive behaviour of the nano-reinforced CSS was analyzed during cyclic flexural and compressive loading using the four-probe method. The optimal carbon nanomaterials (CNM) content was found to depend on the water and cement ratios. Generally, elevating the water content led to a rise in the CNM optimal concentration, primarily attributed to improved dispersion and adequate water for the cement hydration process. The maximum increments in flexural and compressive strengths, compared to plain CSS, were significant, reaching up to approximately 30% for flexural strength and 41% for compressive strength, for the specimen containing 18% cement, 12% water, and 0.17% CNM. This improvement was attributed to the nanoparticles' pore-filling function, acceleration of hydration, regulation of free water, and facilitation of crack-bridging mechanisms in the geocomposite. Further decreases in cement and water content adversely impacted the piezoresistive performance of the composite. Notably, specimens containing 8% cement (across all water content variations) and 10% cement (with 8% and 12% water content) showed a lack of piezoresistive responses. In contrast, specimens containing 14% and 18% cement displayed substantial sensitivity, evidenced by elevated gauge factors, under loading conditions.

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Section: Introductionmentioning

confidence: 99%

Influence of cement and water content on the multifaceted capabilities of a self-sensing cement-based geocomposite: a comprehensive analysis

Abedi,

Roshan,

Adresi

et al. 2024

Meas. Sci. Technol.

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“…To establish the sensing capability, various conductive fillers, including steel fibers [ 5 , 6 , 7 , 8 ], micro- and nanocarbon fibers [ 9 , 10 , 11 , 12 ], carbon black structures [ 13 , 14 , 15 , 16 ], carbon nanotubes [ 17 , 18 , 19 , 20 , 21 ], graphene nanoplatelets [ 22 , 23 , 24 , 25 , 26 , 27 ], steel fibers [ 28 , 29 ], and hybrid conductive fillers [ 30 , 31 , 32 , 33 ], are incorporated into cementitious composites. However, carbon-based functional materials vastly increase cementitious composite piezoresistivity and enhance mechanical characteristics [ 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Performance of Self-Sensing Cement-Stabilized Sand under Various Loading Conditions

Roshan,

Abedi,

Gomes Correia

et al. 2024

Sensors

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Numerous elements, such as the composition and characteristics of carbon nanomaterials, the composition and characteristics of the matrix material, moisture levels, temperature, and loading circumstances, influence the piezoresistive behavior of self-sensing cementitious composites. While some past research has explored the impact of some of these factors on the performance of self-sensing cementitious composites, additional investigations need to be conducted to delve into how loading conditions affect the sensitivity of self-sensing cement-stabilized composites. Therefore, this study explores the influences of various loading conditions (i.e., location of loading regarding the location of recording electrodes, and loading level) on the electromechanical performance of self-sensing cement-stabilized sand. To this end, firstly, the evaluation of the percolation threshold based on 10% cement-stabilized sand specimens containing various multiwall carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs) was performed. Then, 10% cement-stabilized sand containing 4% MWCNTs/GNPs was tested under various cyclic compressive stresses. The results suggested that the distance between the loading area and the electrode location used for recording the electrical resistance significantly impacted the sensitivity of cement-stabilized sand. Optimal sensitivity was achieved when the electrodes were positioned directly beneath the loading area. Moreover, the study showed that the stress sensitivity of self-sensing cement-stabilized sand increased proportionally with the stress level. An examination through scanning electron microscopy (SEM) demonstrated that the loading condition influences the bridging characteristics of carbon nanomaterials in cement-stabilized sand, leading to diverse electromechanical behaviors emerging based on the loading condition. This study underscores the importance of considering specific parameters when designing self-sensing cement-stabilized sand for application in practical field use.

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Electromechanical response of smart ultra-high-performance concrete under uniaxial load: Experimental investigation and electric field analysis

Cho,

Kim,

Kim

et al. 2024

Construction and Building Materials

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Effects of temperature and humidity on self-stress sensing capacity of smart concrete blocks

Cited by 4 publications

References 37 publications

Influence of cement and water content on the multifaceted capabilities of a self-sensing cement-based geocomposite: a comprehensive analysis

Influence of cement and water content on the multifaceted capabilities of a self-sensing cement-based geocomposite: a comprehensive analysis

Performance of Self-Sensing Cement-Stabilized Sand under Various Loading Conditions

Electromechanical response of smart ultra-high-performance concrete under uniaxial load: Experimental investigation and electric field analysis

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