Coastal and Floodplain Construction Inspector's Practice Exam

Which of the following is NOT one of ACI 318 requirements for concrete exposure?

1. Exposure to sulfates in water or soil

2. Exposure to water with low permeability

3. Exposure to extreme heat

4. Exposure to chlorides from deicing chemicals

The correct answer is: Exposure to extreme heat

The American Concrete Institute (ACI) 318 sets guidelines for the design and construction of concrete structures to ensure their safety and longevity in various environmental conditions. When assessing concrete exposure, key factors include the potential for chemical reactions or physical deterioration based on the environment in which the concrete is placed. Exposure to sulfates in water or soil is a significant concern due to the potential for sulfate attack, which can lead to serious structural damage. Addressing this exposure is integral to ensuring the durability of concrete in affected environments. Similarly, exposure to chlorides from deicing chemicals is critical because chlorides can initiate corrosion of the reinforcing steel within concrete, leading to weakened structures. ACI 318 contains requirements that specify measures to mitigate these risks. Additionally, exposure to water with low permeability relates to the durability of concrete against water infiltration and the overall strength of the concrete mix. High permeability can allow harmful substances to penetrate, compromising the integrity of the concrete over time. In contrast, exposure to extreme heat is not addressed as a specific requirement in ACI 318. While high temperatures can indeed affect some properties of concrete, such as causing spalling or affecting curing processes, they are not treated in the same fundamental way as the other types of chemical exposures listed. The focus