Control Joints: These are joints that are intentionally created to control cracking. They are typically straight lines that run perpendicular to the direction of expected movement in the concrete. Control joints are typically spaced at regular intervals, and their spacing is determined by factors such as the thickness of the concrete and the expected amount of movement.
Expansion Joints: These are joints that allow for the expansion and contraction of the concrete due to changes in temperature and humidity. They are typically wider than control joints and are often filled with a flexible material such as rubber or neoprene.
Construction Joints: These are joints that occur where one concrete pour meets another. They are typically located at the end of a day's work or when work is interrupted for any reason. Construction joints are typically reinforced with steel dowels or other materials to ensure structural integrity.
Isolation Joints: These are joints that are used to separate concrete from other materials, such as walls or columns. Isolation joints are typically filled with a flexible material to allow for movement between the concrete and the other material.
Contraction Joints: These are joints that are used to control the contraction of the concrete during the curing process. They are typically created by placing strips of material on the surface of the concrete before it sets.