Shrinkage Cracking

Definition

Shrinkage cracking refers to the cracking of a structure or member due to failure in tension caused by external or internal restraints as reduction in moisture content develops.

Purpose

The purpose of understanding shrinkage cracking is to identify and mitigate factors that lead to cracks, ensuring the structural integrity and longevity of concrete and masonry structures.

Examples of Use

• Concrete slabs experience shrinkage cracking if not properly cured or if subjected to rapid drying.
• Masonry walls may develop shrinkage cracks due to the drying and contraction of mortar joints.
• Pavement and roadways can exhibit shrinkage cracking caused by changes in moisture content and temperature.

Related Terms

• Curing: The process of maintaining adequate moisture, temperature, and time to allow concrete to achieve desired properties.
• Expansion Joint: A joint that allows for movement in structures to accommodate shrinkage and thermal expansion.
• Tensile Stress: The stress that occurs when a material is subjected to a stretching force.

Notes

Proper curing, the use of control joints, and the selection of appropriate materials can help minimize shrinkage cracking in concrete and masonry structures.

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