Although the steel–concrete interface (SCI) is widely recognized to influence the durability of reinforced concrete, a systematic overview and detailed documentation of the various aspects of the SCI are lacking. In this paper, we compiled a comprehensive list of possible local characteristics at the SCI and reviewed available information regarding their properties as well as their occurrence in engineering structures and in the laboratory. Given the complexity of the SCI, we suggested a systematic approach to describe it in terms of local characteristics and their physical and chemical properties. It was found that the SCI exhibits significant spatial inhomogeneity along and around as well as perpendicular to the reinforcing steel. The SCI can differ strongly between different engineering structures and also between different members within a structure; particular differences are expected between structures built before and after the 1970/1980s. A single SCI representing all on-site conditions does not exist. Additionally, SCIs in common laboratory-made specimens exhibit significant differences compared to engineering structures. Thus, results from laboratory studies and from practical experience should be applied to engineering structures with caution. Finally, recommendations for further research are made.

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The steel-concrete interface

FRP materials for the rehabilitation of tubular steel structures, for underwater applications

Shrinkage influence on tension stiffening in concrete members

Cracking behavior in reinforced concrete members with steel fibers: A comprehensive experimental study

Experimental study on crack width and crack spacing for Glass-FRP reinforced concrete beams

Crack formation presents a complex mechanical and geometrical question to be modelled. The available crack width formulations are often based on simplifications. A rigorous formulation of crack widths should be based on the integration of strain differences of reinforcement and concrete between cracks, due to the accumulated slips. In this paper an extensive literature review on crack widths and crack spacing is presented. The basic intention of the present paper is to summarise the development of flexural crack models and collect the most relevant formulae for crack spacing and crack width. It reports not only the possible improvement of design or research equations but also the appearance of new types of reinforcements with different characteristics from those of steel reinforcements. This state-of-the-art Report is a contribution to the work of fib TG 4.1 ‘Serviceability Models’.

Models for flexural cracking in concrete: the state of the art

Long-Term Behavior of FRP

Considerable corrosion of reinforced concrete members accelerated the research on non-metallic materials such as fiber reinforced polymers (FRP) for structural applications in non-corrosive reinforcement. This paper describes a comparative experimental study that was performed on prestressed concrete beams pretensioned with carbon-FRP or steel wires. Load-deflection responses are analyzed and pivot point of loading-unloading moduli under repeated loading is defined. Practical details are given on the prestressing technique and heat curing.

Adorján Borosnyói

Papers

Models for flexural cracking in concrete: the state of the art

Long-Term Behavior of FRP

Prestressing with cfrp tendons