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Temperature variations in concreteChanges in the temperature of concrete can cause cracking. As the concrete gets hotter, it expands; as concrete gets cooler, it contracts. This is similar for many other materials you have probably learned about.If the concrete wants to expand or contract but can't, it will most likely crack. For example, the concrete near the foundation of a dam is restricted by the foundation -- there, the concrete can't expand or contract if it needs to and this might result in cracking. But what would cause a change in temperature? Well, there are a number of reasons:
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