Devastating impact of permeability

Devastating impact of permeability and initial thermal cracks on in situ marine concrete: offering reasonable strategies

Mehdi Reza Pour

Chabahar Maritime University

Mehdi Yusefi

Abstract

Permeability and initial cracks are the most important factors affecting on marine concrete gradual devastation. In fact, these are initial factors of marine chemical materials affecting on concrete and armature corrosion.

In other words, if solutions are offered, i.e to reduce the permeability of concrete as much as possible, chemical damages will decrease sharply, especially chloride.

Precast concretes typically used in marine structures, due to exactness in the design and suitability of concrete factory, are produced with the highest quality and they will have the compressive strength and durability in the long time. But this is not true about the in situ marine concrete due to lack of suitability of conditions.

First: factors which increase the permeability and initial cracks in the concrete and the progress of failures from cracks and permeability will be identified. Then, the solutions for in situ marine concrete implement principles will be offered and strategies will be discussed to reduce the harmful effects of chloride penetration, freezing- thawing cycles, salts crystallization and weathering of the marine concrete.

Key words:marine concrete, freezing- thawing cycles, salts crystallization,weathering