About electrical resistivity variation during drying and improvement of the sensing behavior of carbon fiber-reinforced smart concrete

Allam, Hamza; Duplan, François; Clerc, Jean-Pierre; Amziane, Sofiane; Burtschell, Yves

doi:10.1016/j.conbuildmat.2020.120699

Cited by 26 publications

(9 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Moreover, a good distribution reduces differences between different specimens [7], giving a more homogeneous impedance for different specimens, reflected in a decrease of standard deviation values. The effect of fibers presence on the impedance values, compared to non-fibrous cementitious matrix, would reduce it by many orders of magnitude as proved previously [6].…”

Section: Discussionsupporting

confidence: 69%

“…The mixing sequence and energy were tested to evaluate their effect on fiber dispersion. To assess the relationship between the impact of mixing on impedance and the theoretical percolation state of carbon fibers, each mixing sequence was tested for a low-fiber volume fraction -0.1 % (around the percolation threshold of carbon fibers) and a high-fiber volume fraction -0.5 % (in the saturation zone of carbon fibers) [6].…”

Section: Methods and Experimental Setup 21 Materialsmentioning

confidence: 99%

“…The presence of fibers has been proved to affect rheology -especially when clusters are formed. Also, the creation of clusters causes additional air void content, and consequently reduces the compressive strength [5] [6]. For sensing behavior, non-homogeneous dispersion of fibers reduces the efficiency of fibers as doping agents and, more importantly, leads to unstable electrical behavior.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessment of manufacturing process efficiency in the dispersion of carbon fibers in smart concrete by measuring AC impedance

Allam

Duplan

Amziane

et al. 2022

Cement and Concrete Composites

Self Cite

View full text Add to dashboard Cite

HIGHLIGHTS AC impedance measurement is an efficient tool to assess fiber dispersion in mortar  The protocol of component addition is proved to influence the final impedance and homogeneity of mortar  When the mixing energy is doubled, impedance values are increased, having a negative effect on the fibers' efficiency in creating conductive paths  When the percolation increases from around the theoretical percolation threshold to a saturated regime, the effect of the manufacturing process was reduced

show abstract

Section: Discussionsupporting

confidence: 69%

Section: Methods and Experimental Setup 21 Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of manufacturing process efficiency in the dispersion of carbon fibers in smart concrete by measuring AC impedance

Allam

Duplan

Amziane

et al. 2022

Cement and Concrete Composites

Self Cite

View full text Add to dashboard Cite

show abstract

“…As the relative humidity was less than 100%, water evaporated from the samples [45]; -OD -Samples were placed in the oven at 40 °C and the experiment was performed at a partial saturation degree with more water loss than in the samples placed in room conditions.…”

Section: Effect Of Annealing On Resistivitymentioning

confidence: 99%

Cementitious composites incorporating Multi-Walled Carbon Nanotubes (MWCNTs): effects of annealing and other dispersion methods on the electrical and mechanical properties

Shahzad

Toumi

Balayssac

et al. 2022

Matériaux & Techniques

View full text Add to dashboard Cite

This study focuses on different techniques for dispersing Multi-Walled Carbon Nanotubes (MWCNTs) in cementitious materials. The impact of dispersion is observed through electrical resistivity and mechanical properties of cementitious composites. Two contents (0.5 and 1% by mass of cement) of MWCNTs are investigated and three different techniques were used to disperse CNTs in water by sonication: (i) pristine, P-CNT, (ii) functionalized carbon nanotubes by classical approach (dispersive agent, D-CNT), and (iii) by an innovative approach (annealing, A-CNT). Self-sensing response of the material under cyclic compressive loading is measured with Wheatstone Bridge (WSB) circuit. Results showed a detrimental effect of dispersive agent on the resistivity and mechanical properties of cementitious composites irrespective of the content of CNTs. However, the impact of P-CNT and A-CNT on the reduction of mechanical properties is slight. With the use of 1% content of A-CNTs, a stable resistivity response of the material is observed irrespective of the saturation degree. This indicates that content higher than 1% of A-CNTs is not required for the development of smart cementitious composites for structural health monitoring (SHM). The test results of self sensing measurements indicate a poor repeatability of the electrical response for plain mortar under each loading cycle while, stable response is noticed with specimens incorporating 1% of A-CNTs. The maximum variation in fractional change in voltage (FCV) shown by plain mortar is 6.3% indicating high electrical resistance of plain mortar, while in case of mortar containing 1% A-CNTs, variation in FCV is 35% indicating lower electrical resistance and better sensitivity of the material.

show abstract

“…In addition, in the field of sensing characteristics, many scholars have also conducted research [17][18][19][20][21][22][23][24][25]. For example, Z.F.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Mechanical-Electrical Performance of Carbon Fibre Sensing Concrete

Fang¹

2021

Ceramics - Silikaty

View full text Add to dashboard Cite

Carbon fibre smart concrete is not only a promising type of structural materials, but also has prospective applications in fields that have special functional requirements. Here, the carbon fibre smart concrete was prepared by the extrusion moulding technique, and the resistivity, pressure-sensitive and temperature-sensitive characteristics were discussed as well as the freezing-thawing properties. The results show that the total porosity of the smart concrete decreases when the carbon fibre was added into a cement matrix, which is 15.72 % in the case when carbon fibre content is 1.0 wt. %. The resistivity of the smart concrete decreases quickly with the addition of carbon fibre, which gradually decreases with an increasing temperature and then gradually increases, and the critical transition temperature zone is in the range of 100 -130 ℃. The compressive and flexural strengths of the smart concrete are the highest when the carbon fibre content is 0.6 wt. %. The rate of change of the resistivity shows an obvious linear response under cyclic loading effects. The freeze-thaw resistance ability of the smart concrete with the addition of carbon fibres is better than that without carbon fibres, and the compressive strength reaches the highest level when the carbon fibre mass fraction is 0.6 wt. %, which indicates that a suitable amount of carbon fibres can effectively restrict the damage to smart concrete induced by temperature stress.

show abstract

About electrical resistivity variation during drying and improvement of the sensing behavior of carbon fiber-reinforced smart concrete

Cited by 26 publications

References 46 publications

Assessment of manufacturing process efficiency in the dispersion of carbon fibers in smart concrete by measuring AC impedance

Assessment of manufacturing process efficiency in the dispersion of carbon fibers in smart concrete by measuring AC impedance

Cementitious composites incorporating Multi-Walled Carbon Nanotubes (MWCNTs): effects of annealing and other dispersion methods on the electrical and mechanical properties

Preparation and Mechanical-Electrical Performance of Carbon Fibre Sensing Concrete

Contact Info

Product

Resources

About