Experimental Investigation of Self-Sensing Carbon Fiber Reinforced Cementitious Composite for Strain Measurement of an RC Portal Frame

Yeh, Fang-Yao; Chang, Kuo‐Chun; Liao, Wen-Chieh

doi:10.1155/2015/531069

Cited by 10 publications

(6 citation statements)

References 10 publications

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“…Moreover, the addition of very low carbon fiber contents is enough to provide this electrical feature to cement-based elements. Yeh et al [ 92 ] noticed a good accuracy and sensitivity using a 0.2 vol % of carbon fibers, useful for detecting both elastic and plastic deformations.…”

Section: Fibersmentioning

confidence: 99%

Admixtures in Cement-Matrix Composites for Mechanical Reinforcement, Sustainability, and Smart Features

et al. 2016

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For more than a century, several inclusions have been mixed with Portland cement—nowadays the most-consumed construction material worldwide—to improve both the strength and durability required for construction. The present paper describes the different families of inclusions that can be combined with cement matrix and reviews the achievements reported to date regarding mechanical performance, as well as two other innovative functionalities of growing importance: reducing the high carbon footprint of Portland cement, and obtaining new smart features. Nanomaterials stand out in the production of such advanced features, allowing the construction of smart or multi-functional structures by means of thermal- and strain-sensing, and photocatalytic properties. The first self-cleaning concretes (photocatalytic) have reached the markets. In this sense, it is expected that smart concretes will be commercialized to address specialized needs in construction and architecture. Conversely, other inclusions that enhance strength or reduce the environmental impact remain in the research stage, in spite of the promising results reported in these issues. Despite the fact that such functionalities are especially profitable in the case of massive cement consumption, the shift from the deeply established Portland cement to green cements still has to overcome economic, institutional, and technical barriers.

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Section: Fibersmentioning

confidence: 99%

Admixtures in Cement-Matrix Composites for Mechanical Reinforcement, Sustainability, and Smart Features

et al. 2016

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“…Since then, a growing body of literature has been published on the influence of functional fillers and their sensing properties [2][3][4][5][6]. To achieve high sensitivity and conductivity of concrete carbon, carbon fibers, carbon nanotubes or graphite powder is added to the concrete mixtures [7][8][9][10]. These highly engineered mixtures act as a strongly sensitive material under mechanical loading as published in previous studies [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The effect of moisture and reinforcement on the self-sensing properties of hybrid-fiber-reinforced concrete

Maier

2020

Eng. Res. Express

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This study presents the piezoresistive properties of a hybrid fiber-reinforced concrete (HyFRC) for structural health monitoring. This HyFRC mixture incorporates micro PVA and macro steel fibers to control the crack propagation. Investigations on self-sensing concrete (SSC) focus mainly on mixtures containing highly conductive fillers such as carbon nanotubes, graphite or nickel powder which results in a highly engineered cost-intensive mix composition for structural applications. This paper investigates the sensing ability of a cost-effective structural concrete mixture by considering the environmental conditions of engineering structures e.g. the moisture content as well as the influence of reinforcement on the electrical resistance measurement. The sensing parameters were evaluated by performing simultaneously bending tests and Electrochemical Impedance Spectroscopy (EIS) on beams with and without steel reinforcement. Furthermore, the influence of the pore solution on the EIS was investigated on specimens with varying moisture contents. The sensing behavior was compared to a control mixture without steel and PVA fibers. Results showed a significant lower initial resistivity for the HyFRC mixture compared to the ordinary concrete as well as the activation of the self-sensing properties due to the incorporated steel fibers. Finally, the influence of the pore solution on the EIS measurement is addressed and emphasizes the imperative need to consider the moisture content of self-sensing materials.

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“…Since these discoveries, the idea of self-sensing carbon fibers has been developed and is still being improved upon today. Currently, the development of two independent technologies using conductivity of carbon-based materials for strain measurement can be observed: printed gauges based on graphite carbon nanotubes [ 3 , 4 , 5 , 6 , 7 ], and those based on continuous carbon fiber [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. It should be emphasized that only the latter allows for the use of an essential feature of carbon fibers, which is their high strength.…”

Section: Introductionmentioning

confidence: 99%

Development of Self-Sensing Textile Strengthening System Based on High-Strength Carbon Fiber

2018

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The monitoring of structures is one of the most difficult challenges of engineering in the 21st century. As a result of changes in conditions of use, as well as design errors, many building structures require strengthening. This article presents research on the development of an externally strengthening carbon-fiber textile with a self-sensing option, which is an idea is based on the pattern of resistive strain gauges, where thread is presented in the form of zig-zagging parallel lines. The first laboratory tests showed the system’s high efficiency in the measurement of strains, but also revealed its sensitivity to environmental conditions. This article also presents studies on the influence of temperature and humidity on the measurement, and to separate the two effects, resistance changes were tested on unloaded concrete and wooden samples. The models were then placed in a climatic chamber, and the daily cycle of temperature and humidity changes was simulated. The research results confirmed preliminary observations of resistivity growths along with temperature. This effect is more visible on concrete samples, presumably due to its greater amount of natural humidity. The strain measurement with carbon fibers is very sensitive to temperature changes, and applications of this method in practice require compensation.

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Experimental Investigation of Self-Sensing Carbon Fiber Reinforced Cementitious Composite for Strain Measurement of an RC Portal Frame

Cited by 10 publications

References 10 publications

Admixtures in Cement-Matrix Composites for Mechanical Reinforcement, Sustainability, and Smart Features

Admixtures in Cement-Matrix Composites for Mechanical Reinforcement, Sustainability, and Smart Features

The effect of moisture and reinforcement on the self-sensing properties of hybrid-fiber-reinforced concrete

Development of Self-Sensing Textile Strengthening System Based on High-Strength Carbon Fiber

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