Sandblast

Definition

Sandblasting is a system of cutting or abrading a surface, such as concrete, by a stream of sand ejected from a nozzle at high speed, using compressed air to propel the sand. It is often used for cleaning horizontal construction joints, exposing aggregate in architectural concrete, scarifying surfaces for better bonding, and cleaning metal before painting.

Purpose

The purpose of sandblasting is to clean, roughen, or shape surfaces by removing contaminants, old paint, or rust, and to prepare the surface for further treatment or finishing.

Examples of Use

• Sandblasting is used to clean and prepare concrete surfaces for new coatings or overlays.
• Metal surfaces are sandblasted to remove rust and old paint before applying a new coat of paint.
• Architectural concrete is sandblasted to expose aggregate and achieve a decorative finish.

Related Terms

• Abrasive Blasting: A general term for using a high-speed stream of abrasive material to clean or finish surfaces.
• Grit Blasting: Similar to sandblasting but using different abrasive materials like steel grit.
• Surface Preparation: The process of preparing a surface for coating or finishing.

Notes

Proper safety measures, such as protective clothing and respiratory protection, are essential when sandblasting to protect workers from dust and abrasive particles.