Carbon Fiber Epoxy Composites for Both Strengthening and Health Monitoring of Structures

Salvado, Rita; Lopes, Catarina; Szojda, Leszek; Araújo, Pedro; Górski, Marcin; Velez, Fernando J.; Castro-Gomes, João; Krzywoń, Rafał

doi:10.3390/s150510753

Cited by 44 publications

(24 citation statements)

References 18 publications

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“…In order to verify indications of smart textile and defining gauge factor parallel, a set of 7 paper strain gauges was adhered. A more detailed description of these studies is presented in [14]. Initially trials confirmed capabilities of developed smart textile in terms of both strengthening and monitoring aspects.…”

Section: The Concept and First Laboratory Trialsmentioning

confidence: 91%

Self-Monitoring Strengthening System Based on Carbon Fiber Laminate

et al. 2016

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Externally bonded composites reinforced with high-strength fibers are increasingly popular in construction, especially in structures’ strengthening, where the best possible mechanical properties are required. At the same time the ability to autodetect threats is one of the most desirable features of contemporary structures. The authors of the paper have developed an intelligent fabric, wherein the carbon fibers play the role of not only tensile reinforcement but also strain sensor. The idea is based on the construction of the strain gauge, where the thread of carbon fibers arranged in zig-zag pattern works as electrical conductor and is insulated by parallel thread of glass or acrylic fibers. Preliminary laboratory tests were designed to create effective measurement techniques and assess the effectiveness of the strengthening of selected building structures, as reinforced concrete and timber beams. Presented in the paper, selected results of these studies are very promising, although there were some noted problems to be considered in next steps. The main problem here is the control of the cross section of the fibers tow, affecting the total resistance of the fabric. One of the main deficiencies of the proposed solution is also sensitivity to moisture.

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Section: The Concept and First Laboratory Trialsmentioning

confidence: 91%

Self-Monitoring Strengthening System Based on Carbon Fiber Laminate

et al. 2016

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“…1). Compared to the previously developed woven modifications [11], this construction allows the creation of a sensor of any length under conditions of building side. Glass fiber mesh stabilization reduces the risk of accidental short-circuiting during the assembly of the sensor.…”

Section: Strain Sensor Based On Carbon Fibersmentioning

confidence: 99%

The Effect of Humidity on the Electrical Resistance of Smart Sensor Based on Carbon Fibers

Górski¹,

Krzywoń²,

Kekez³

2019

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The paper describes preliminary studies on the influence of humidity on the electrical resistance of a textile sensor made of carbon fibers. The concept of the sensor refers to externally bonded fiber reinforcement commonly used to strengthen building structures. However, the zig-zag arrangement of carbon fiber tow allows measuring strains, as it is done in popular resistive strain gauges. The sensor tests proved its effectiveness in the measurement of strains, but also showed a high sensitivity to changes in the temperature and humidity which unfavorably affects the readings and their interpretation. The influence of these factors must be compensated. Due to the size of the sensor, there is not possible electrical compensation by the combining of several sensors into the half or full Wheatstone bridge circuit. Only mathematical compensation based on known humidity resistance functions is possible. The described research is the first step to develop such relations. The tests were carried out at temperatures of 10 °C, 20 °C and 30 °C, with changing the humidity in the range of 30-90%.

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“…The relation between strain and load increment was developed by similar path readings from the strain gauges (see Figure 2). Detailed description of initial tests and calibration procedure had been presented by Salvado et al at [9]. The next step was to work on the prototype of sensing fabric.…”

Section: Initial Tests On Smart Textile Specimenmentioning

confidence: 99%

Smart Textiles for Strengthening of Structures

et al. 2016

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This paper presents results of mechanical tests on a prototype of an innovative structural strengthening in form of self-monitoring fabric. Smart textile employs carbon fibers conductivity for measuring strains while monitoring changes of electric resistance under increasing load. A general solution was tested in a series of calibrating tests on strengthening of small size concrete slabs. Promising results of simple specimen, has encouraged the research team to perform the next tests using mastered carbon fibre reinforced fabric. Main tests were performed on natural scale RC beam. Smart textile proved its efficiency in both: strengthening and monitoring of strains during load increase. New strengthening proposal was given 10% increase of loading capacity and the readings of strain changes were similar to those obtained in classical methods. In order to calibrate the prototype and to define range limits of solution usability, textile sensor was tested in areas of large deformations (timber beam) and as well as very small strains (bridge bearing block). In both cases, the prototype demonstrated excellent performance in the range of importance for structural engineering. This paper also presents an example of use of the smart strengthening in situ, in a real life conditions.

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Carbon Fiber Epoxy Composites for Both Strengthening and Health Monitoring of Structures

Cited by 44 publications

References 18 publications

Self-Monitoring Strengthening System Based on Carbon Fiber Laminate

Self-Monitoring Strengthening System Based on Carbon Fiber Laminate

The Effect of Humidity on the Electrical Resistance of Smart Sensor Based on Carbon Fibers

Smart Textiles for Strengthening of Structures

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