Design of Concrete structure for Durability
Durability depends on permeability hence it is necessary to control parameters affecting permeability. To make concrete durable best cementitious material should be used. To lower permeability, Water-cement ratio should be lowered and that will increase durability. Durability is the ability of the structure to withstand weathering actions, abrasion, chemical attacks, or any other forms of concrete deterioration. Concrete cover is responsible for protecting steel bars from detrimental influences of carbonation, chloride, fire, and other external hazards; that is why adequate concrete cover thickness is crucial to maintain concrete durability. While designing cover should not be exceeded 2.5 times the diameter of the reinforcing bar. It is necessary to control the crack to protect steel rebar against corrosion. This crack is controlled by reducing shrinkage, and distributing the reinforcement over the zone of maximum concrete tension, uniformly, and using smaller diam