Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The use of fibre reinforced plastic bars as concrete reinforcement
For the reinforcement of concrete structures, there is one ideal material steel. This construction material has as advantages, a high strength, good workability, and a low price. Due to the high alkalinity of concrete there are almost never corrosion problems found in 'typical' concrete constructions. If however, reinforced concrete will be used in a strongly corrosive environment, the protection of the steel by the concrete cover is often not enough. It is here that the advantages of fibre reinforced plastic bars as reinforcement can best be utilised. Because of the smooth surface of pultruded bars, the weak bond between concrete and FRP-bars was one of the problems encountered in using these bars as reinforcement. Therefore one of the first uses of FRP-bars was as unbonded, prestressed reinforcement cables. In 1986 the first bridge with GFRP prestressed cables was finished. FRP-bars are made out of fibres, which are embedded in a resin matrix. The fibre orientation is normally unidirectional. As fibres glass, carbon, aramid and PVA fibres are used. To produce FRP-bars thermosetting resins are normally used, like unsaturated polyester resin (UP), epoxy resins (EP), and vinyl ester resins (VE). FRP-bars are exclusively produced using the pultrusion process. The fibres are pulled through a resin, then a bar is formed in a profiling tool, and after that the bar is hardened in an oven. The bond behaviour between matrix and reinforcement, the fatigue strength as well as the durability are tested. To protect fibres from alkaline damage a alkaline resistant resin can be used. The damage is dependent to the alkalinity (pH value), the temperature and the stress in the bar. To protect fibres from alkaline damage a alkaline resistant resin can be used. The damage is dependent to the alkalinity (pH value), the temperature and the stress in the bar. The use of FRP-bars is extremely relevant in constructions near salt corrosive regions.
The use of fibre reinforced plastic bars as concrete reinforcement
For the reinforcement of concrete structures, there is one ideal material steel. This construction material has as advantages, a high strength, good workability, and a low price. Due to the high alkalinity of concrete there are almost never corrosion problems found in 'typical' concrete constructions. If however, reinforced concrete will be used in a strongly corrosive environment, the protection of the steel by the concrete cover is often not enough. It is here that the advantages of fibre reinforced plastic bars as reinforcement can best be utilised. Because of the smooth surface of pultruded bars, the weak bond between concrete and FRP-bars was one of the problems encountered in using these bars as reinforcement. Therefore one of the first uses of FRP-bars was as unbonded, prestressed reinforcement cables. In 1986 the first bridge with GFRP prestressed cables was finished. FRP-bars are made out of fibres, which are embedded in a resin matrix. The fibre orientation is normally unidirectional. As fibres glass, carbon, aramid and PVA fibres are used. To produce FRP-bars thermosetting resins are normally used, like unsaturated polyester resin (UP), epoxy resins (EP), and vinyl ester resins (VE). FRP-bars are exclusively produced using the pultrusion process. The fibres are pulled through a resin, then a bar is formed in a profiling tool, and after that the bar is hardened in an oven. The bond behaviour between matrix and reinforcement, the fatigue strength as well as the durability are tested. To protect fibres from alkaline damage a alkaline resistant resin can be used. The damage is dependent to the alkalinity (pH value), the temperature and the stress in the bar. To protect fibres from alkaline damage a alkaline resistant resin can be used. The damage is dependent to the alkalinity (pH value), the temperature and the stress in the bar. The use of FRP-bars is extremely relevant in constructions near salt corrosive regions.
The use of fibre reinforced plastic bars as concrete reinforcement
Der Einsatz von faserverstärkten Kunststoffstangen zur Verstärkung von Beton
Deußler, S. (Autor:in) / Wörner, J.D. (Autor:in)
Techtextil Symposium, 1998 ; 1 ; 205-210
1998
6 Seiten, 5 Bilder, 1 Tabelle
Aufsatz (Konferenz)
Englisch
Tests on Concrete Beams Reinforced with Glass Fibre Reinforced Plastic Bars
| British Library Conference Proceedings | 1997
Development Length for Fibre Reinforced Plastic Bars
| British Library Conference Proceedings | 1992
Evaluation of Fibre-Reinforced Plastic Reinforcing Bars for Structural Application in Concrete
| British Library Conference Proceedings | 1994
Analysis of Concrete Structures Strengthened with Fibre-Reinforced-Plastic Reinforcement
| British Library Conference Proceedings | 1994
Bond characteristics of fibre reinforced polymer bars in glass fibre reinforced concrete
| British Library Conference Proceedings | 2005