Final answer:
Type II Portland cement is more resistant to sulfates and generates less heat of hydration due to its reduced Tricalcium aluminate content. Tricalcium aluminate content is preferred in environments with high sulfate concentrations and where low heat of hydration is desired.
Step-by-step explanation:
Portland cement is categorized into different types based on their composition and performance characteristics. Among these types, Type II cement is more resistant to sulfates and generates less heat of hydration due to its reduced Tricalcium aluminate content.
Tricalcium aluminate is responsible for the rapid setting and early strength development of cement, but it is also prone to sulfate attack and can contribute to excessive heat generation during hydration. Therefore, Type II cement with lower Tricalcium aluminate content is preferred in environments with high sulfate concentrations and where low heat of hydration is desired.