What is a construction joint used for?

A construction joint serves a specific purpose in concrete construction, primarily relating to the placement and integrity of concrete structures. Its main function is to mark stopping points for concrete pouring, which is essential when working on large areas or when the concrete needs to be placed in stages.

When concrete is poured, the process often cannot be completed in one continuous action, particularly in extensive pours. A construction joint is created at a predetermined point that allows for the first batch of concrete to set before continuing with subsequent pours. This helps to ensure that the strength and appearance of the concrete are maintained, preventing potential structural issues that may arise from improper bonding between different pours.

It's also vital to design construction joints correctly to manage potential shrinkage, cracking, or other forms of distress that could occur as the concrete cures and ages. While one might think of weight support, structural connections, or insulation in construction, those functions do not align with the specific role of a construction joint.