Title: In Concrete Construction, what is a Cold Joint? (with pictures)
Headings: In Concrete Construction, what is a Cold Joint? (with pictures)
In Concrete Construction, what is a Cold Joint? (with pictures)
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Kirsten C. Tynan
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Content: The discontinuity occurs between the layers due to the inability of the freshly poured, wet concrete to intermix with and bind properly to the hardened concrete. Such a discontinuity is often the result of logistical issues such as a contractor’s work schedule or an unexpected material shortage. A cold joint is when the bottom layer of concrete dries before the rest of the concrete is poured on top of it. Problems associated with cold joints range from the relatively minor to the very serious. At the less serious end of the spectrum, a cold joint may result in a visually unappealing discontinuity that is visible on the surface once the concrete has hardened. This kind of aesthetic defect may simply be concealed rather than repaired. A more serious problem associated with a cold joint is the possibility of moisture intrusion into the concrete section. If water settles in the joint, it may lead to degradation of the concrete under certain environmental conditions. For example, as water expands when it freezes and then contracts when it melts, water trapped in a cold joint may cause cracking or erosion of the material. Moisture may also damage other things beyond the concrete mass if it is able to seep all the way through it.