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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Kirsten C. Tynan
Last Modified Date: January 26, 2021
Kirsten C. Tynan
Date: January 26, 2021
Cold joints may be reinforced by inserting metal reinforcing bars, or rebar. A cold joint is an undesirable discontinuity between layers of concrete that occurs when one layer of concrete is allowed to harden before the rest of the concrete is poured in what is meant to be a single, solid mass. 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.