Structural applications patching

Righiniotis, T. D., Aggelopoulos, E. S. and Chryssanthopoulos, M. K. (2004), Fracture mechanics 2D-FEA of cracked steel plate with a CFRP patch . Advanced Polymer Composites for Structural Applications in Construction (ACIC 2004), eds L. C. Hollaway, M. K. Chryssanthopoulos and S. S. J. Moy. Woodhead Publishing,... 

Epoxy adhesives are widely used in most industries for the structural bonding of most types of materials (metals, wood, plastics, composites, ceramics, glass, concrete, masonry, etc). Primers may be recommended for some materials. They are also used to repair structures bonding patches and crack-filling. Some adhesives are specifically designed for aerospace applications or specialised mechanical and electrical assembly. 

How to Use Lures are available as twist ties or patches apply according to label directions. Make the first application in early spring before the moths emerge reapply 3 months later to continue protection throughout the summer. Mating disruption lures seem to work best when applied over a large area, such as an orchard. If you want to use them to protect one tree or a few trees in your backyard, apply the lures to other plants or structures (such as fences) throughout your property. 

The first applications involve two broadband dual-polarized patch antennas. Figure 8.4(a) describes the former structure fed by a capacitatively coupled and an H slot-coupled feed. 

Most proprietary, pre-bagged mixes carry guarantees of the materials particularly for carbonation repairs. Manufacturers and applicators will be more cautious with chloride repairs and cannot guarantee that all chloride is removed in areas adjacent to the patch. The incipient anode problem (see Section 6.2.1) is far more prevalent in chloride contaminated structures so corrosion will continue around the patches. 

Figure 6.6 (a) Roof structures before treatment showing obtrusive anticarbonation coatings and exposed reinforcement due to chloride and carbonation-induced corrosion, (b) Roof structures after repair and coating where the visual effect of patch repairs are minimized by application of Keim Concretal Lazure coating. 

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