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Reasons for poor contact in cold-joint
A cold joint in concrete construction is a plane of weakness that forms when new, wet concrete is poured against concrete that has already begun to harden. Instead of forming a monolithic (single, unified) structure, the two layers fail to bond properly. This discontinuity occurs because the older material has passed its initial setting time, preventing a true chemical bond with the fresh mix. It's important for construction professionals to understand what causes cold joints and how to manage them effectively.