INTRODUCTION OF DESIGN OF CONCRETE STRUCTURES :
These design and construction measures ensure adequate structural resistance against chloride action, improper construction process, insufficient concrete cover, and inadequate utilization of construction materials such as cement and additives, which are not suitable for specific aggressive conditions.
As durability depends upon permeability. It is essential to control parameters affecting permeability. Therefore, it is necessary to lay down permissible limits for parameters like minimum cementitious material content, maximum water to cement ratio, maximum crack width and extent of cover to reinforcement, etc. depending upon the exposure condition.DESIGN OF CONCRETE STRUCTURES
It is necessary to employ optimum cementitious materials content to make concrete durable. Low materials content jeopardize the strength of the structural elements where high cementitious materials would increase the possibility of shrinkage, which commonly reduce concrete durability.