Structure reinforcement by composite system – General informations





Engineering solutions for the restoration, structural reinforcement, placing in seismic safety of civil and industrial building, schools, hospitals, parks, bridges, viaducts, cultural heritage, places of worship.


The term composite system FRP refers to materials composed of high-resistance, continuous  fiber fabrics immersed in a polymeric matrix. Since the nineteen-fifties, these materials have been used worldwide on a large scale in aeronautical and mechanical engineering because of their very high level of mechanical performance. More recently, they have been used in other industrial sectors, and especially in the field of structural reinforcement of concrete, metal and masonry for civil and industrial  buildings, bridges, tunnels, monuments.

The principle characteristics of the composite systems are high resistance to tensile strength , very good ductility and resistance to corrosion, high flexibility and very limited weight and thickness.

In the last years have been introduced in the international market  different composites system like FRCM (carbon, AR glass and basalt grids) and SRG  (UHTSS  high resistance steel fabric) used with an inorganic matrix (like cementitious or structural lime ) for structural reinforcement  of building.  The main advantages of these systems are high resistance, ductility, fire resistance, easy application on rough and moist surfaces.


The FRP SYSTEM are wet lay up system using  high-density carbon-fiber and pultruded laminate, E-AR glass or aramid  strips glued to supports with special structural adhesives RESIN  with superior mechanical characteristics. With both the plating and the wrapping methods of application, the system reinforces the structure where it is necessary to improve or restore static conditions, by increasing their resistance, load-bearing qualities and ductility, but without overloading the structure.

The FRCM-SRG SYSTEM  are  composite materials  using carbon (C-NET) , AR glass (G-NET) , AR basalt (B-NET)  grids and steel fabric (STEEL NET) applied with special high resistance and adhesive mortar CONCRETE ROCK  and LIMECRETE.  These systems are particularly suitable for structures reinforcing  with uneven,  rough and moist surfaces (concrete and masonry), for fire resistance and with reduced weight and thickness.  These systems are also compatible with historical building and monuments.


The main applications of the FRP-FRCM-SRG  SYSTEMS  are in the following areas:

  • Reinforcement of deflected structures  like beams, slabs, knots, pillars;
  • Reduction of loaded deflection, increase of load-bearing capacity,  reduction of cracks under loading;
  • Reinforcement of compressed structures like walls, pillars, columns, chimney stacks;
  • Increase of compressive strength, flexural-compressive strength and ductility;
  • Improvement of structures in seismic zones without increasing weight;
  • Reinforcement and consolidation of weakened and damaged structures;
  • Suitable for  restoration of historical building like vaults, arches, domes,  deflected masonry panels, etc…

In general, the reinforcing  systems  are  suitable for concrete such as civil and industrial buildings, viaducts, bridges, car-parks, tunnels, hospitals, for masonry such as constructions, historical  buildings and monuments, places of worship, for wood and metal structures.


According with the system used many advantages are manifest:

  • High level of mechanical characteristics and performances;
  • High chemical resistance to corrosion;
  • Increase of resistance to stress;
  • Reliability and long-life of the reinforced building;
  • Excellent applicability in moist  environments;
  • High tear resistance also on rough and  uneven substrates;
  • Reduced weight and thickness of the reinforcement;
  • Easily draped of fabrics and grids over structures and adapted to complex forms and uneven surfaces;
  • Easy  application of the system  without  complex  on-site management;
  • Limited reduction of permeability in frescoed vaults and walls;
  • Reduced time and costs  of the works