Abstract
Long and short‐term (accelerated with simulation of pressure developed by compressed rust) experimental investigations were accomplished. It was investigated in long‐term tests the relationship between the width of the longitudinal cracks on the concrete surface and close to the reinforcement, and relation between these widths and corrosion‐induced damages in the reinforcement; parameters of these relationships were established. In short‐time investigations it was tried to clarify the influence of transverse reinforcement and opened normal cracks on the nature of longitudinal cracks propagation. It has been determined that the character and the rate of propagation of the longitudinal cracks depend on distribution of transverse reinforcement and normal cracks along a member.
Highlights
In structures exposed to an aggressive environment corrosion usually starts in reinforcement embedded in concrete
Investigations of reinforced concrete structures in Lithuania show that the major part of these structures are with open longitudinal cracks due to corrosion of reinforcement just after 10–20 years in use
Results of investigations into corrosion of cast in concrete steel bars and concrete cracking indicate that propagation of longitudinal cracks has opened due to pressure developed by the rest and can be described by Eqs (1) and (2) used when evaluating the damage to reinforcement induced by corrosion [5]
Summary
In structures exposed to an aggressive environment corrosion usually starts in reinforcement embedded in concrete. Efforts to implement into a practical use possibilities of the models for cracks propagation according to these criteria is restricted by the lack of data on investigations in the relationship between parameters of longitudinal cracks and the rate of reinforcement corrosion, about relationship between the propagation character of these cracks and position of the longitudinal and transverse reinforcement in the crosssection of the member and the spacing of the normal cracks, about the influence of the concrete structure and the character of the load resulting in longitudinal cracks. In this article data on experimental investigations in the width of these cracks on the surface of concrete and reinforcing bars, in relations between corrosive damage to the reinforcement (decrease in cross-sectional area) and these widths, as well as in influence of transverse reinforcement and spacing of normal cracks on propagation of longitudinal cracks are analysed
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