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. The delayed placement prevents full integration and knitting between the concrete batches and might lead to reduced structural robustness, increased. The main reasons for cold joints include delays in pouring, poor planning, equipment issues, and not having enough workers. This discontinuity occurs because the older material has passed its initial setting time, preventing a true chemical bond with the fresh mix. They help enhance workability and reduce the chances of cold joints. This comprehensive guide from B.