Which of the following is a common cause of cracking in concrete?

Shrinkage due to temperature changes is indeed a common cause of cracking in concrete. As concrete cures, it undergoes a process known as hydration, which generates heat and can lead to temperature-induced stresses. When the concrete is poured and begins to cool, it contracts; however, if this shrinkage happens unevenly, it can create tensile stresses that the concrete may not be able to withstand, leading to visible cracks.

Cracking from shrinkage can occur at different stages, including during the initial curing phase or later as the structure settles. Managing the temperature and hydration conditions during curing, such as using proper curing techniques and controlling the temperature of the concrete mix, are essential practices to mitigate this type of cracking.

Other options like excessive moisture, improper mixing, and incorrect cement type may also lead to various issues, but they are less universally recognized as primary causes of cracking specifically due to temperature variations.