Concrete technology

1. Concrete in corrosive environment

2. Definition
• Concrete corrosion is the chemical, colloidal or physicochemical
deterioration and disintegration of solid concrete components
and structures, due to attack by reactive liquids and gases. This
type of corrosion causes widespread damage to critical sewage
pipelines, bridges and other critical assets made of concrete

3. Types of corrosion
• Uniform Corrosion. Uniform corrosion is considered an even attack across
the surface of a material and is the most common type of corrosion. ...
• Pitting Corrosion. ...
• Crevice Corrosion. ...
• Intergranular Corrosion. ...
• Stress Corrosion Cracking (SCC) ...
• Galvanic Corrosion.

4. Damages due to concrete corrosion
• The expansion of corroding steel creates tensile stresses in the
concrete, which can cause cracking, delamination, and spalling.

5. Prevention
• The best way to prevent corrosion in concrete is by a corrosion
inhibiting admixture. Corrosion inhibiting admixtures either
extend the natural corrosion inhibiting properties of the Portland
cement or they reduce the corrosion rate of the embedded
metal and there are some admixtures that provide both benefits