What type of concrete must be used for moderate weather conditions in carports?

For moderate weather conditions in carports, air-entrained concrete is recommended because it incorporates microscopic air bubbles in the mix. These air pockets provide a level of flexibility and resistance to freeze-thaw cycles, which is particularly beneficial in climates that may experience moderate temperature fluctuations.

Using air-entrained concrete helps to mitigate the risk of cracking and scaling that can occur when water permeates the concrete and then freezes, expanding and causing damage. This property makes air-entrained concrete particularly suitable for applications like carports, where exposure to the elements is common.

In contrast, non-air-entrained concrete lacks this protective feature, making it more vulnerable to damage from freeze-thaw cycles. Lightweight concrete typically does not provide the same durability or resistance to weather variations as air-entrained concrete. High-performance concrete is designed for specific structural applications and may not necessarily include the properties that are optimal for moderate weather conditions specifically in carports. Thus, air-entrained concrete is the correct choice, ensuring the longevity and integrity of the structure in moderate weather situations.