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Content archived on 2024-04-16

FIBER COMPOSITE ELEMENTS AND TECHNIQUES AS NON-METALLIC REINFORCEMENT OF CONCRETE

Objective

Deterioration of concrete structures due to corrosion of steel reinforcement is a world-wide problem, especially in the case of exposure to aggressive environment (e.g. marine atmosphere, sea water, aggressive chemicals, deicing brine). Alternative reinforcing and pre-stressing materials which do not corrode in such environments due to their nonsusceptibility to ionic dissolution may be a valuable expedient. Such materials are unidirectional fibre reinforced plastics (FDP), consisting of endless glass-amid- and carbon fibres in a polymeric matrix. Most important properties of these FRP materials for the application for civil engineering structures are : very high tensile strength in fibre direction, excellent corrosion resistance and very low density. More durable concrete structures and a range of new kinds of structural elements and of new applications are realizable with FRP reinforcement and/or pre-stressing.

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Within the programme's frame, extensive research and development work was performed to study the behaviour and performance of FRP as well as the structural behaviour of concrete elements reinforced or prestressed with FRP (fiber reinforced polymer) reinforcement. Several FRP-materials were developed and preselected for application in concrete through comprehensive materials research. Within the tests programmes, glass-FRP (GFRP), aramid-FRP (AFRP) and carbon-FRP (CFRP) were investigated. From the results and the analysis of these tests it is concluded that the behaviour of concrete elements reinforced or prestressed with FRP is predictable and generally satisfactory. Furthermore, it became clear that FRP-reinforcements are not simply a replacement of steel. Therefore, the use and design of FRP reinforced or prestressed elements is governed by the specific characteristics and aspects of FRP-materials. Mechanical behaviour, durability etc. of the FRP-materials were studied on single tensile elements as well as on tendons with a plurally of elements in suitable anchorages. As result of the project, several forms of application with these FRP's are possible. Pilot applications proved the market chances.
The tasks will be :

-Adjustment of material properties of FRP elements and of production technologies to the demands of structural engineering.
-Investigation of load bearing behaviour of concrete members reinforced and/or pre-stressed with FRP.
-Development of application techniques : reinforcing elements, anchorage assemblies, post-tensioning systems, etc.
-Development of criteria for design, detailing and execution of concrete members with FRP.

Based on recent developments, clearly demonstrating the advantages of FRP for many structural applications, this project concentrates on material properties, especially under long term static and fatigue stresses under simultaneous chemical attack, on the load-bearing behaviour of concrete members reinforced and/or pre-stressed with FRP and on development and testing anchorages for FRP tendons. Generation of up to now otherwise unavailable data in the above mentioned areas is a major goal of the project.SP 1 2

Topic(s)

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Call for proposal

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Funding Scheme

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Coordinator

SICOM Gesellschaft für Sensor- und Vorspanntechnik mbH
EU contribution
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Address
Gremberger Straße 151A
5000 Köln
Germany

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Participants (4)