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Chapter 4 - Producing Silica-Fume Concrete
Preventing Plastic-Shrinkage Cracking

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Slide
Plastic shrinkage cracking, by definition, is cracking that occurs while the concrete is still plastic. It is actually a desiccation problem, very similar to the dried soil shown in this photo. If water is evaporating from the concrete surface faster than it is being supplied by bleeding, tensile stresses will develop in the concrete. Ultimately, these stresses will be greater than the very small ability of the still-plastic concrete to resist the stresses and cracking will result.