Estudo da aderência de barras de aço coladas ao concreto com resina Epóxi.

Abstract

Just like others fields of knowledge, the civil construction is evolving. Hughes investments and the need for new projects improve the speed and the technology usually applied for basic infrastructure s development. These scenarios achieve issues as the miss understanding of the behavior of this technological advances in long terms, caused by the few studies and researches about these subjects. At the concrete structures field, an extremely self consolidate knowledge whose have been replaced for new methods, as the case of the polymeric materials. This kind of material have large scale of applications at construction and projects of structural elements, used as a bond interface for different elements and offering a significant monolithically performance between structural pieces. The current study pretends analyze the behavior of bonded steel bars at the concrete using epoxy resin. The development of the study occur by lab tests where a steel bar is pulled out of a concrete block, named Pull-out-test. This one was adapted for a bond whit epoxy resin, were the results was compared whit the regular ones (concrete bonded bars), in this method the phenomenon of the stress occurred at the bar surface in contact whit the concrete or the resin evaluate. Some parameters were included for a better understanding of the bond behavior, such as: Steel bar diameter (10mm, 12,5mm and 16mm); Length of anchorage (5φ and 7,5φ), and Resin thickness (1mm, 2mm and 3mm). For the same purpose, was molded a concrete beam to represent the bonded situation at a real condition, these beam had two different configuration, one of those were a regular reinforcement beam, and the other one were a recuperated reinforcement beam, whit yours inferior steel bar added post concrete solidification, simulating a intervention at a problematic beam, in this case the steel bars were bonded whit epoxy resin at the edges of the beam.