Which term is used to describe a joint that accommodates movement and expansion in concrete?

The term that accurately describes a joint specifically designed to accommodate movement and expansion in concrete is isolation joint. Isolation joints are critical in concrete construction as they allow for differential movement between adjoining concrete elements, such as slabs and other structures, ensuring that one can move without affecting the other. This functionality is vital in preventing damage and cracking due to thermal expansion or contraction caused by changes in temperature or moisture.

In contrast, contraction joints are designed to control and limit cracking that may occur as the concrete shrinks during the curing and drying processes. Control joints also serve a similar purpose, providing planned locations for cracks to occur without detrimental effects on the overall structure. Construction joints, on the other hand, are used to join two pours of concrete together and are typically not intended to accommodate movement but rather mark the point at which the concrete placement was halted and resumed.

The specific purpose of isolation joints in allowing independent movement sets them apart in scenarios where expansion and separate structural movements occur.