QUALITY CONTROL CONCRETE IN AGGRESSIVE SALINE EXPOSURE ENVIRONMENT

Abstract

For many years, the deterioration of concrete structures in a severe marine environment, mostly in the form of
chloride-induced corrosion of embedded steel, has been a big problem and challenge for the construction industry. To
meet this challenge, there is consolidated effort in the form of research and development of quality control of concrete.
Extensive experience demonstrates that the durability of concrete structures is closely related not only to design and
material but also to construction issues. Although to a certain extent a probability-based approach to the durability
design can take the wide variability of construction quality into account, a numerical approach to the durability design
alone is not sufficient for ensuring a proper durability. For concrete structures in severe environments, construction
quality and variability is a key issue, which must be firmly grasped to achieve a more controlled durability.
In order to comply with the overall durability requirement of the given structure, a proper quality control of both the
specified chloride diffusivity and the concrete cover must be carried out during the concrete construction. For both of
these durability parameters average values and the standard deviation must be obtained. If cathodic prevention or
preparation for such a protective measure has also been specified, regular quality control of the electrical continuity
within the rebar system must also be carried out during concrete construction. This paper reviews the necessary test
method and procedure for measurement and control of the above durability parameters. The present paper deals with
filed study of aggressive environment exposed structure and non destructive analysis.