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Effects of elevated temperatures on the interface properties of carbon textile-reinforced concrete
Abstract This work reports on an experimental investigation of the influence of elevated temperatures on the interface between carbon yarns and a Portland cement based matrix. Polymer-coated and uncoated carbon yarns were tested at temperatures of 20°C under a double-sided pullout test configuration after being subjected to a heating regime at temperatures of 100, 150, 200, 400 and 600°C. The degradation mechanisms of the cementitious matrix were investigated by X-ray diffraction and thermal analysis. Using an environmental scanning electron microscope, micro-structural analysis was performed to evaluate the degradation of the carbon yarn and of its interface with the matrix. After preheating up to 150°C, samples with coated fibres showed significant increases in maximum pullout load and, correspondingly, work to pullout. On a micro-scale this is related to a polymer interlocking mechanism in the yarn–matrix interface, which is generated during the heating and cooling of the polymer yarn coating. Above 400°C no further typical fibre pullout behaviour was observed; the reinforcing yarn failed suddenly after the cracking of the matrix. For uncoated yarn preheating up to 200°C had no significant impact on the maximum pullout load. At 600°C the matrix and fibres showed major signs of deterioration; no further typical fibre pullout behaviour other than failure of the reinforcing yarn could be observed.
Effects of elevated temperatures on the interface properties of carbon textile-reinforced concrete
Abstract This work reports on an experimental investigation of the influence of elevated temperatures on the interface between carbon yarns and a Portland cement based matrix. Polymer-coated and uncoated carbon yarns were tested at temperatures of 20°C under a double-sided pullout test configuration after being subjected to a heating regime at temperatures of 100, 150, 200, 400 and 600°C. The degradation mechanisms of the cementitious matrix were investigated by X-ray diffraction and thermal analysis. Using an environmental scanning electron microscope, micro-structural analysis was performed to evaluate the degradation of the carbon yarn and of its interface with the matrix. After preheating up to 150°C, samples with coated fibres showed significant increases in maximum pullout load and, correspondingly, work to pullout. On a micro-scale this is related to a polymer interlocking mechanism in the yarn–matrix interface, which is generated during the heating and cooling of the polymer yarn coating. Above 400°C no further typical fibre pullout behaviour was observed; the reinforcing yarn failed suddenly after the cracking of the matrix. For uncoated yarn preheating up to 200°C had no significant impact on the maximum pullout load. At 600°C the matrix and fibres showed major signs of deterioration; no further typical fibre pullout behaviour other than failure of the reinforcing yarn could be observed.
Effects of elevated temperatures on the interface properties of carbon textile-reinforced concrete
Silva, Flávio de Andrade (author) / Butler, Marko (author) / Hempel, Simone (author) / Toledo Filho, Romildo Dias (author) / Mechtcherine, Viktor (author)
Cement and Concrete Composites ; 48 ; 26-34
2014-01-09
9 pages
Article (Journal)
Electronic Resource
English
Effects of elevated temperatures on the interface properties of carbon textile-reinforced concrete
| Online Contents | 2014