Cold joints occur when there's an unintended interruption in the concrete pouring process. This results in weak seams where the two layers fail to chemically bond. The delayed placement prevents full integration and knitting between the concrete batches and might lead to reduced structural robustness, increased. A cold joint in concrete, also known as a construction joint, is a point in a concrete structure where fresh concrete is placed against previously cured or partially cured concrete. It's important for construction professionals to understand what causes cold joints and how to manage them effectively. They can be a real pain, potentially leading to structural issues down the line.