Abstract
FRCM (Fabric Reinforced Cementitious Matrix) composites are the next stage of development of composite structural reinforcement after FRP (Fibre Reinforced Polymers) composites. The main element that distinguishes the newer FRCM system is the matrix of the composite – mineral matrix instead of epoxy resin. Changes in the structure of the composite, resulting from the change of the matrix, have a big impact on its work mechanisms. This paper discusses FRCM composites and shows its effectiveness in reinforced concrete elements strengthening. The basic information on FRCM mesh fibres material differences and composite failure modes are given. Current trends and directions of composite structural strengthening and the latest research in the area of increasing FRCM composite strengthening effectiveness, that are being conducted by the authors, are presented.
Highlights
The need of reinforced concrete structures strengthening can be caused by various reasons
FRCM composites behaviour under tension is significantly different from the FRP, which work manifests itself in a linear stress-strain model
It is visible that the failure of FRCM composite is not due to the strength of the fibres, but its source is the trouble with keeping the composite layers together
Summary
The need of reinforced concrete structures strengthening can be caused by various reasons. At the beginning of the 1980s, the use of FRP (Fibre Reinforced Polymers) composites as a structural strengthening was popularized. Their properties such as high strength-toweight ratio and corrosion resistance have made them a good alternative to traditional methods of strengthening [1]. These composites are made of various types of high-strength fibres immersed in epoxy resin matrix. Despite the many undeniable advantages, the FRP composites have a major drawback related to their resistance to elevated temperatures This phenomenon results from the strength characteristics of the epoxy resin depending on the temperature. Mechanical interlock mechanism is formed between the fibres and the matrix [1], so loosening the fibres in the form of a mesh is needed to allow the matrix to pass through the layer of fibres
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