Shrinkage

Definition

Shrinkage is the decrease in volume, or contraction, of a material by the escape of any volatile substance, or by a chemical or physical change in the material. It also refers to the decrease in volume of earth/material resulting from compaction.

Purpose

The purpose of understanding shrinkage is to anticipate and manage volume changes in materials, ensuring stability and accuracy in construction and manufacturing processes.

Examples of Use

• Concrete experiences shrinkage as water evaporates and the cement hydrates, leading to potential cracking.
• Soil compaction causes shrinkage, reducing the volume of earth used in construction projects.
• Wood shrinks as it dries, affecting its dimensions and structural integrity.

Related Terms

• Compaction: The process of increasing soil density by reducing air gaps, typically through mechanical means.
• Moisture Content: The amount of water contained in a material, affecting its volume and stability.
• Drying: The process of removing moisture from materials, often leading to shrinkage.

Notes

Managing shrinkage involves using appropriate materials, proper curing, and accounting for volume changes during the design and construction phases.

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