Composite Materials Technologies in Constructions Structural Retrofitting: New Developments and Applications in Historical Buildings and Applications in Seismic Zone

Abstract eng:
Application of composite materials in construction started in Italy at beginning of the „90‟s and was generally accepted as one of the most important technologies for retrofitting and structural recovery of buildings. In 2004 the Italian National Research Council (CNR) issued the guideline for design and applications of composite materials in constructions and in 2009 it has been officially adopted for reconstruction at “ L‟Aquila” after the earthquake of April 6, 2009. The big advantage offered by Composites, mainly based on carbon fibres, is derived by the special properties of the reinforcing fibres. Applications of composites range from concrete structures to masonry, bricks, steel and wood structures and more specifically reinforcement of beams, columns, vaults, arches, walls, concrete slabs, floors and total building belting. Since 1993 many important original solutions and know how on materials, design and applications have been developed: reinforcing fabrics produced by an original patented process of thermo welding; connection systems based on Ardfix original technology, to prevent delamination; technology for wood beams reinforcements; cables technology and anchoring systems, new water base matrix systems with high fire resistance and good permeability to humidity and water. A large experience in new solutions, and an important know how in applications has been developed. New thermo welded mashes produced with alkali resistant zircon glass fibres, have been developed for direct application in concrete or calcium based mortar matrices. These special mash grade is produced avoiding traditional induction process with plastic coating, leaving the surface of the fibre free from polymer and preserving the good capacity of adhesion to cement or calcium. Many applications example of the above concept are reported, mainly related to Historical Building retrofitting.

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