Damage and Defect Detection Through Infrared Thermography of Fiber Composites Applications for Strengthening of Structural Elements

Fiber Reinforced Polymer (FRP) composites are today widely used for the strengthening and seismic retrofitting of structures. The efficiency of this technology is strongly dependent on the correct positioning and bonding of the fibers on the surface of the structure to be reinforced. The connection between the surface of the substrate (concrete, masonry or steel) and the fibers is assured by the adhesives. The control of the application may be performed with different Non Destructive Evaluation (NDE) techniques but presently there are no standard procedures to assess the quality of the applications in civil engineering structures. Infrared thermography represents a valid tool for the detection and measurement of bonding defects or damage in the composite strips and can be used even for the definition of possible damage progression. The paper presents a series of results obtained using infrared thermography for different types of applications: masonry walls and concrete beams

Silk fibroin-based hydrogels and scaffolds for osteochondral repair and regeneration

Osteochondral lesions treatment and regeneration demands biomimetic strategies aiming physicochemical and biological properties of both bone and cartilage tissues, with long-term clinical outcomes. Hydrogels and scaffolds, appeared as assertive approaches to guide the development and structure of the new osteochondral engineered tissue. Moreover, these structuresalone or in combination with cells and bioactive molecules, bring the mechanical support after in vitro and in vivo implantation. Moreover, multilayered structures designed with continuous interfaces, furnish appropriate features of the cartilage and subchondral regions, namely microstructure, composition, and mechanical properties. Owing the potential as scaffolding materials, natural and synthetic polymers, bioceramics, and composites, have been employed. Particularly, significance is attributed to the natural-based biopolymer silk ï¬ broin from the Bombyx mori silkworm, considering its unique mechanical and biological properties. The significant studies on silk fibroin-based structures, namely hydrogels and scaffolds, towards bone, cartilage, and osteochondral tissue repair and regeneration are overviewed herein. The developed biomimetic strategies, processing methodologies, and final properties of the structures are summarized and discussed in depth.s The authors thank to the project FROnTHERA (NORTE-01-0145- FEDER-000023), supported by Norte Portugal Regional Operational Programme (NORTE 2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF). The financial support from the Portuguese Foundation for Science and Technology to Hierarchitech project (M-ERA-NET/0001/2014), for the fellowship grant (SFRH/ BPD/113806/2015) and for the fund provided under the program Investigador for J. M. Oliveira (IF/00423/2012 and IF/01285/2015) are also greatly acknowledged.info:eu-repo/semantics/publishedVersio