Till Quadflieg - Academia.edu (original) (raw)
Papers by Till Quadflieg
The bond between mortar and textile reinforcement is of crucial evidence for Textile Reinforced C... more The bond between mortar and textile reinforcement is of crucial evidence for Textile Reinforced Concrete (TRC). Often, SBR (Styrene-Butadiene Rubber) and EP (Epoxy) impregnated carbon and AR-Glass fibre textiles are used. However, the bonding behavior within these reinforcements for TRC has shown potential for improvement, especially when testing the adhesive tensile strength. Therefore, a preliminary trial was undertaken to investigate the influence of a surface coating with EP and sand as a bonding agent to improve the bond characteristics of TRC. A SBR-impregnated carbon textile was modified with silica sand EP ratios of 0.10, 0.20 and 0.30. In the conducted studies tensile tests on single rovings and on rectangular TRC samples have been carried out. No reduction of the tensile strength of the single rovings was reported. The first results of this study on TRC specimens with a surface modified textile reinforcement and a sand EP ratio of 0.10 already indicate an improvement of th...
Advances in Science and Technology, Jan 13, 2013
ABSTRACT Technical textiles are used primarily for their technical functionality in many differen... more ABSTRACT Technical textiles are used primarily for their technical functionality in many different industries. For monitoring the functionality of textiles it is possible to integrate sensors into the textile. Since textiles are made of fibres, yarns, two-or three dimensional structures the sensor systems should accordingly be designed as a part of them. Smart textiles are concerned with textile based sensors integrated mechanically and structurally to a textile. The state of the art in developing textile based sensors extends from sensor fibres to over coated yarns and textiles but without using standardized tools. The development of a textile sensor and its interpretation on a specific application has been associated with many investigations into combination of different conductive materials, what is a lengthy and costly developing process. Knowledge has already been generated on textile sensors, which now requires an appropriate classification and structure. A classified catalogue which allows a direct selection of textile based sensor modules on the basis of measured values. The catalogue´s structure follows, apart from the VDI- guideline 2222, of which complex coherences can be arranged and a clear representation can be found. Setting standards in the field of smart textiles helps companies to produce more smart products.
This study examines and demonstrates the feasibility of a new class of smart textile reinforced c... more This study examines and demonstrates the feasibility of a new class of smart textile reinforced concrete (TRC) structural elements with inherent sensing capabilities that are based on embedding metallic yarns in the textile mesh. The new approach combines the advantages of thin walled glass fiber based TRC with the electro-mechanical properties of the stainless steel fibers embedded in the textile matrix. To examine this concept and to demonstrate its potential feasibility, TRC beam specimens are tested and monitored under mechanical and environmental loading condition. The results of the tests demonstrate the features of the sensory/structural system, reveals its potential use as a basis for a combined structural and functional monitoring system, and highlights its spectrum of potential applications.
Journal of Intelligent Material Systems and Structures, 2015
This article investigates the feasibility of intelligent textile-reinforced concrete structural e... more This article investigates the feasibility of intelligent textile-reinforced concrete structural elements with sensing capabilities. The concept is based on dual use of glass and carbon fiber textiles as reinforcement and, at the same time, as a sensory agent. Experimental investigation demonstrates the feasibility of the concept in two applications: detecting strains in a mechanically loaded textile-reinforced concrete beam and monitoring the interaction of the structural element with a wet environment. By detecting the changes to the integrative electrical resistance of the carbon tow, the ability of the textile to sense strain and exposure to water is demonstrated. For strain sensing, the hybrid reinforcing textile provides electro-mechanical sensing with a gauge factor of the order of 1 and a detectable correlation with the load, strain, and displacement responses. For the detection of wetting, the implementation of the carbon tow in a Wheatstone bridge detects fractional resistance changes in the order of 10 25 , a figure that is effectively detected by monitoring the voltage across the bridge. The response to wetting, which is conditioned by the cracking of the beam and the exposure to ionic conductive solutions, provides a mean to monitor the functionality and the structural health of the textile-reinforced concrete beam.
In the last ten years there have been funded several projects for the development of smart textil... more In the last ten years there have been funded several projects for the development of smart textiles, e.g., in market sections like healthcare, interior textiles, automobile and protective clothing. However, up to now, these textiles have no application in daily use. A reaseon might be that most users bear a great skepticism about unfamiliar technologies, resulting in a low acceptance. Beside the technological and strategic barriers, the awareness and acceptance of the ease of product use and knowledge are the most important issues for the practical implementation. To bridge these acceptance barriers there is a need for interdisciplinary research between the engineering sciences and the humanities.
Advances in Science and Technology, 2012
ABSTRACT Technical textiles are used primarily for their technical functionality in many differen... more ABSTRACT Technical textiles are used primarily for their technical functionality in many different industries. For monitoring the functionality of textiles it is possible to integrate sensors into the textile. Since textiles are made of fibres, yarns, two-or three dimensional structures the sensor systems should accordingly be designed as a part of them. Smart textiles are concerned with textile based sensors integrated mechanically and structurally to a textile. The state of the art in developing textile based sensors extends from sensor fibres to over coated yarns and textiles but without using standardized tools. The development of a textile sensor and its interpretation on a specific application has been associated with many investigations into combination of different conductive materials, what is a lengthy and costly developing process. Knowledge has already been generated on textile sensors, which now requires an appropriate classification and structure. A classified catalogue which allows a direct selection of textile based sensor modules on the basis of measured values. The catalogue´s structure follows, apart from the VDI- guideline 2222, of which complex coherences can be arranged and a clear representation can be found. Setting standards in the field of smart textiles helps companies to produce more smart products.
The Journal of The Textile Institute, 2016
The bond between mortar and textile reinforcement is of crucial evidence for Textile Reinforced C... more The bond between mortar and textile reinforcement is of crucial evidence for Textile Reinforced Concrete (TRC). Often, SBR (Styrene-Butadiene Rubber) and EP (Epoxy) impregnated carbon and AR-Glass fibre textiles are used. However, the bonding behavior within these reinforcements for TRC has shown potential for improvement, especially when testing the adhesive tensile strength. Therefore, a preliminary trial was undertaken to investigate the influence of a surface coating with EP and sand as a bonding agent to improve the bond characteristics of TRC. A SBR-impregnated carbon textile was modified with silica sand EP ratios of 0.10, 0.20 and 0.30. In the conducted studies tensile tests on single rovings and on rectangular TRC samples have been carried out. No reduction of the tensile strength of the single rovings was reported. The first results of this study on TRC specimens with a surface modified textile reinforcement and a sand EP ratio of 0.10 already indicate an improvement of th...
Advances in Science and Technology, Jan 13, 2013
ABSTRACT Technical textiles are used primarily for their technical functionality in many differen... more ABSTRACT Technical textiles are used primarily for their technical functionality in many different industries. For monitoring the functionality of textiles it is possible to integrate sensors into the textile. Since textiles are made of fibres, yarns, two-or three dimensional structures the sensor systems should accordingly be designed as a part of them. Smart textiles are concerned with textile based sensors integrated mechanically and structurally to a textile. The state of the art in developing textile based sensors extends from sensor fibres to over coated yarns and textiles but without using standardized tools. The development of a textile sensor and its interpretation on a specific application has been associated with many investigations into combination of different conductive materials, what is a lengthy and costly developing process. Knowledge has already been generated on textile sensors, which now requires an appropriate classification and structure. A classified catalogue which allows a direct selection of textile based sensor modules on the basis of measured values. The catalogue´s structure follows, apart from the VDI- guideline 2222, of which complex coherences can be arranged and a clear representation can be found. Setting standards in the field of smart textiles helps companies to produce more smart products.
This study examines and demonstrates the feasibility of a new class of smart textile reinforced c... more This study examines and demonstrates the feasibility of a new class of smart textile reinforced concrete (TRC) structural elements with inherent sensing capabilities that are based on embedding metallic yarns in the textile mesh. The new approach combines the advantages of thin walled glass fiber based TRC with the electro-mechanical properties of the stainless steel fibers embedded in the textile matrix. To examine this concept and to demonstrate its potential feasibility, TRC beam specimens are tested and monitored under mechanical and environmental loading condition. The results of the tests demonstrate the features of the sensory/structural system, reveals its potential use as a basis for a combined structural and functional monitoring system, and highlights its spectrum of potential applications.
Journal of Intelligent Material Systems and Structures, 2015
This article investigates the feasibility of intelligent textile-reinforced concrete structural e... more This article investigates the feasibility of intelligent textile-reinforced concrete structural elements with sensing capabilities. The concept is based on dual use of glass and carbon fiber textiles as reinforcement and, at the same time, as a sensory agent. Experimental investigation demonstrates the feasibility of the concept in two applications: detecting strains in a mechanically loaded textile-reinforced concrete beam and monitoring the interaction of the structural element with a wet environment. By detecting the changes to the integrative electrical resistance of the carbon tow, the ability of the textile to sense strain and exposure to water is demonstrated. For strain sensing, the hybrid reinforcing textile provides electro-mechanical sensing with a gauge factor of the order of 1 and a detectable correlation with the load, strain, and displacement responses. For the detection of wetting, the implementation of the carbon tow in a Wheatstone bridge detects fractional resistance changes in the order of 10 25 , a figure that is effectively detected by monitoring the voltage across the bridge. The response to wetting, which is conditioned by the cracking of the beam and the exposure to ionic conductive solutions, provides a mean to monitor the functionality and the structural health of the textile-reinforced concrete beam.
In the last ten years there have been funded several projects for the development of smart textil... more In the last ten years there have been funded several projects for the development of smart textiles, e.g., in market sections like healthcare, interior textiles, automobile and protective clothing. However, up to now, these textiles have no application in daily use. A reaseon might be that most users bear a great skepticism about unfamiliar technologies, resulting in a low acceptance. Beside the technological and strategic barriers, the awareness and acceptance of the ease of product use and knowledge are the most important issues for the practical implementation. To bridge these acceptance barriers there is a need for interdisciplinary research between the engineering sciences and the humanities.
Advances in Science and Technology, 2012
ABSTRACT Technical textiles are used primarily for their technical functionality in many differen... more ABSTRACT Technical textiles are used primarily for their technical functionality in many different industries. For monitoring the functionality of textiles it is possible to integrate sensors into the textile. Since textiles are made of fibres, yarns, two-or three dimensional structures the sensor systems should accordingly be designed as a part of them. Smart textiles are concerned with textile based sensors integrated mechanically and structurally to a textile. The state of the art in developing textile based sensors extends from sensor fibres to over coated yarns and textiles but without using standardized tools. The development of a textile sensor and its interpretation on a specific application has been associated with many investigations into combination of different conductive materials, what is a lengthy and costly developing process. Knowledge has already been generated on textile sensors, which now requires an appropriate classification and structure. A classified catalogue which allows a direct selection of textile based sensor modules on the basis of measured values. The catalogue´s structure follows, apart from the VDI- guideline 2222, of which complex coherences can be arranged and a clear representation can be found. Setting standards in the field of smart textiles helps companies to produce more smart products.
The Journal of The Textile Institute, 2016