Introduction

To carry out a satisfactory repair it is essential to obtain accurate details of the damage and establish the cause of the failure; with this information it is possible to develop a method of repair to prevent or delay future damage. In this paper consideration of methods of repair of concrete paper consideration of methods of repair of concrete permanently underwater and in the splash zone is related permanently underwater and in the splash zone is related to offshore gravity platforms and the damage that may occur on such structures; however, the repair materials and techniques can be used for any underwater concrete construction.

DAMAGE

Damage may be caused by accident, unexpected structural movement, failure or inadequacy of materials or workmanship in conjunction with hostile environmental conditions. The repair of such damage will have to fulfil one or more of the following tasks:

  • Prevent corrosion

  • Restore full structural strength

  • Prevent leakage

  • Maintain or improve durability

which must be defined for developing the method of repair. The word 'cosmetic' is used loosely to describe a repair which does not restore full structural strength of the damaged area; the use of the word should be avoided because it is inappropriate and it is simple to properly define the particular requirements of a repair. The construction contractors and operators of platforms are naturally reluctant to make known details of platforms are naturally reluctant to make known details of repairs which may be needed to their concrete structures, Such information as can be gained indicates there have been some impact accidents which have reduced or removed the concrete cover to the rebars. It is known that there have been some problems of leakage through cracks during construction and installation stages. However, little has been heard of the type of damage most frequently observed on inshore construction which is the spalling of the concrete cover to rebars due to failure or inadequacy of materials and/or workmanship: no doubt this is due to the very high quality of the concrete and the attention given to this particular problem during the design and construction.

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