Large temperature variations refer to significant fluctuations in temperature over short periods of time, which can be particularly challenging for concrete structures. These variations can range from extreme heat during the day to freezing temperatures at night. Concrete, being a composite material made from cement, aggregates, and water, reacts to changes in temperature. Its ability to withstand such fluctuations without significant degradation is crucial for the longevity and integrity of concrete structures, especially in climates that experience extreme seasonal changes or daily temperature swings.