Florida DOT Concrete Batchman/Operator Practice Exam

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What is one of the main purposes of using air entrainment in concrete?

To reduce labor costs
To reduce the risk of freeze-thaw damage
To change the setting time
To improve aesthetic qualities

The correct answer is: To reduce the risk of freeze-thaw damage

One of the main purposes of using air entrainment in concrete is to reduce the risk of freeze-thaw damage. Air-entraining agents create microscopic air bubbles within the concrete mix. These bubbles provide space for water to expand when it freezes, which helps to alleviate internal pressure that could otherwise lead to cracking and spalling. This is particularly important in regions where freezing temperatures can cause significant damage to concrete structures. Using air-entrained concrete is especially beneficial in climates that experience freeze-thaw cycles, as it enhances the durability and longevity of concrete under harsh weather conditions. While the other options present certain aspects related to concrete properties, they do not directly correlate with the primary function of air entrainment, which revolves around protecting against freeze-thaw damage.