Florida DOT Concrete Batchman/Operator Practice Exam

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What is the maximum concrete temperature allowed when using a hot weather design mix?

80°F
90°F
100°F
110°F

The correct answer is: 100°F

The maximum concrete temperature allowed when using a hot weather design mix is set to ensure that the hydration process of the cement occurs effectively without compromising the properties of the concrete. High temperatures can accelerate the setting time of concrete, potentially leading to issues such as difficulty in finishing, increased risk of cracking, and a reduction in strength due to incomplete hydration. Selecting 100°F as the maximum temperature reflects the guidelines established in concrete practice standards, which state that this temperature threshold is crucial to maintain the integrity and durability of the mix. Limiting the temperature to this level helps to ensure that the added measures to achieve an effective hot weather design—such as using retarders, changing mix proportions, or employing specific curing techniques—remain effective and that the concrete reaches its designed performance properties. In contrast, temperatures exceeding this maximum can pose significant risks, making them unsuitable for safe and effective concrete placement and curing. Hence, 100°F stands as the prudent upper limit in managing concrete under hot weather conditions.