Pultruded profiles are fiber reinforced polymer sections industrially manufactured using complete automated process called "pultrusion", consisting in pulling long fibers through a die of desired shape and guaranteeing their perfect alignment before the polymerization of the matrix. FIDIA S.r.l. - Technical Global Services provides pultruded profiles that can be adopted both in new structures and for Retrofitting-Strengthening existing ones.
On one hand, pultruded fiber-reinforced composite rebars (FRP) may be used for reinforcing concrete structural members where:
- traditional steel reinforcement may be susceptible to attacks by chlorides ions or chemical corrosion;
- the structure may be exposed to electro-magnetic waves;
- as an alternative to galvanized or stainless steel rebars. For more detailed description of possible applications see the section "RC and PC structure sreinforced with FRP bars".
On the other hand, pultruded profiles of different shapes has found several applications for retrofitting/consolidating reinforced concrete, masonry and timber structures, since they present a remarkable strength to weight ratio, resistance to corrosion, making them ideal when retrofitting structures that are in need of strength but not of additional mass.
Pultruded profiles can be bonded directly on the substrate of reinforce concrete and masonry previously prepared by using either circular or rectangular bars bonded using epoxy resins in order to improve flexural and shear strengths of beams and slabs or masonry wall units. Such technique is known as Near Surface Mounted bars (NSM) and is already well-known in the US and in Italy diffused thanks to the technical support of FIDIA S.r.l. and excellent workmanship of TEC.INN. S.r.l.
In timber members, in addition to the above strengthening technique that improves solely flexural abd shear strength, is also common to install IPE and HEA profiles, bonded at the extrados of beams in order to increase also their bending stiffness reducing deflections and incrementing flexural strength, without compromising self-weight. |