Восстановление изгибаемых желеэобетонных элементов с нормальными трещинами

Abstract

The cracks very often exist in reinforced or presstressed concrete structures, which the reasons are commonly known. The repair of cracked structures by resin injection is ordinary procedure. Up to now the investigations were conducted to research the materials and to develop the technology of repairing. However, little knowledge exist on the behaviour of the repaired structure under load. This report decribes the analytical and experimental results of repairing the presstressed concrete members under loading. The results of investigations show, that the injection of polymer glues into cracks restore not only the waterproofing and protection of reinforcement against corrosion, but also has influence on the stiffness, secondary cracking of the repaired members. The influence of different factors on the effectiveness of the repair is shown. They can be analysed by the proposed theoretical formulas.