ExAC Section 3 Practice Exam 2026 – Full Preparation for Architects in Canada

Type V cement is specifically formulated to resist severe sulfate environments, making it the most appropriate choice for projects subjected to high sulfate exposure. It contains a lower percentage of tricalcium aluminate (C3A), which is the compound primarily responsible for susceptibility to sulfate attack. This reduction in C3A helps enhance the durability of the cement when in contact with sulfates found in soil or water.

In contrast, the other types of cement have different characteristics and chemical compositions that do not provide the same level of sulfate resistance. Type II cement offers moderate sulfate resistance, primarily intended for structures exposed to soil and groundwater with lower sulfate content. Type IV cement is known for its low heat of hydration and is typically used in mass concrete structures, not specifically for sulfate resistance. Type III cement is designed for high-strength concrete, setting rapidly but has no enhanced sulfate resistance properties. Thus, for severe sulfate conditions, Type V cement is the optimal selection, ensuring long-term durability and structural integrity.