Jackhammer

A portable percussive tool that repeatedly drives a chisel into hard surfaces such as concrete and pavement. It can be powered by compressed air, electricity, or hydraulics.

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Pneumatic tool: A tool powered by compressed air. Pneumatic jackhammers convert compressed air into repeated blows.
Impact force: A force applied over a short time when bodies collide. Each blow transfers impact force through the bit into the work surface.
Demolition: The deliberate dismantling or destruction of buildings and other structures. Jackhammers break concrete and masonry during small-scale demolition.
Hand-arm vibration syndrome: A disorder involving vascular, neurological, and musculoskeletal damage from prolonged hand-transmitted vibration. Long-term jackhammer operation can expose workers to damaging hand-arm vibration.
Piston: A sliding component that transfers force within a cylinder. A reciprocating piston delivers impacts to the tool bit in many jackhammers.
Concrete: A composite construction material made from cement, water, and aggregates. Concrete is a common target whose hardness makes repeated impacts useful.
Road surface: The upper layer of a road that carries vehicle traffic. Repair crews use jackhammers to remove damaged pavement around utility work.
Occupational hearing loss: Permanent hearing damage caused by repeated or intense workplace noise exposure. Jackhammers produce high noise levels that can harm hearing without protection.
Chisel: A cutting tool with a sharpened edge, driven into material by force. The chisel concentrates each blow on a small area of concrete or pavement.
Asphalt concrete: A pavement material made from mineral aggregates bound with asphalt. Road crews use jackhammers to break asphalt concrete during repairs.