Fiber-reinforced concrete in precast construction

Innovations and applications

Regarding engineering aspects, the use of fibre reinforced concretes in precast construction offers enormous potential because it saves time-consuming and wage-intensive reinforcement works. The DAfStb Guideline “Steel Fibre Reinforced Concrete” for application in building practice in Germany has been introduced by the regulatory authorities for the design of steel fibre reinforced concrete. Due to the lack of experience by the time of introduction, the guideline does not cover the entire range of applications for this construction method.

Recent research results point to further innovations. For example: the use of steel fibres in prestressed purlins and girders obviates the need for shear and surface reinforcement. For torsional stressed members the loadbearing action of the fibres lead to a reduction in structurally and nominally required transverse and longitudinal reinforcement. Compared to conventionally reinforced fire walls, steel fibre reinforced fire walls exhibit greater resistance to heating of the structural member-core. As a result, the addition of fibres reduces the need for costly and complex steel bar reinforcement. Steel fibre reinforced structural members are more resistant to fatigue when subjected to service and cyclic loading, which opens the possibility of advanced applications in precast members: for example craneways, stands etc.

Furthermore, a new Eurocode generation is currently being drawn up on an European level, which will also regulate the design and construction of steel fibre reinforced concrete. This will enhance the significance and relevance of steel fibre reinforced concrete and will enable additional market opportunities, especially for the precast industry.

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