Skip to main content
Theodore Ray
Planning and development surveyor
Asked a question last year

What is meant by Theoretical Thickness in Concrete?

What is meant by Theoretical Thickness in Concrete?

Where am I?

In TheConstructor you can ask and answer questions and share your experience with others!

Seth Morgan
Construction Superintendent

Theoretical thickness = (C/S Area of the section ) / (Semi perimeter in contact with the atmosphere.)

Where, semi perimeter = perimeter /2

For example, Consider a 150 mm side cube, and assume these three sides are exposed to the atmosphere

What is meant by Theoretical Thickness in Concrete?

Then,

What is meant by Theoretical Thickness in Concrete?

Thus the theoretical thickness for the given cube and given exposure conditions is 100 mm.

Where is it used?

Theoretical thickness is generally used in the study of creep or drying shrinkage of a structure. During dry shrinkage, the water is expelled outside of the concrete. As a result, the water travels a path. This path is expressed in terms of theoretical thickness.

Terry Collins
Sustainability consultant

Basically the theoretical thickness formula ;

theoretical thickness = (C/S area of the section) / (semi perimeter in contact with the atmosphere)

here, semi perimeter = perimeter/2

The thickness of the concrete cover measure is usually part of the concrete quality control in modern construction so as to ensure that the thickness of the concrete cover in conformity with the specifications. The process of measuring the thickness of the concrete cover in structures was noted by the beginning of the corrosion, as the lack of concrete cover thickness increased the corrosion rate for corrosion as a result of chlorides or carbonation, where it expedited the propagation inside the concrete, causing the speed of steel corrosion as well as the lack of cover helps the propagation of moisture and oxygen, which are form the main basis for the corrosion process.