Final answer:
Type II concrete offers moderate sulfate resistance, suitable for environments with moderate sulfate levels, as defined by ASTM C150 standards.
Step-by-step explanation:
The type of concrete with moderate sulfate resistance is Type II concrete. This classification is based on the American Society for Testing and Materials (ASTM) standards, specifically ASTM C150, which defines five different types of Portland cement, each with varying properties to suit different environmental conditions and exposure levels to sulfates.
Type II cement offers a good balance by providing resistance against moderate sulfate attacks, making it suitable for use in structures exposed to soil or groundwater with moderate sulfate concentrations.