• The maximum joint spacing should not exceed 30 times the thickness. All panels should be square or nearly. A cold joint in concrete is an area or surface with a structural discontinuity caused by the delayed concrete pouring between two layers of concrete. The delayed placement prevents full integration and knitting between the concrete batches and might lead to reduced structural robustness, increased. Question: Difference between a contraction joint, isolation joint, expansion joint, construction joint, an. This discontinuity occurs because the older material has passed its initial setting time, preventing a true chemical bond with the fresh mix. The Specification for Highway Works clause 1710 section 3 takes a rigid approach in stating: Fresh concrete shall not.
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