Which cement type is typically used for a ground-supported slab when sulfate exposure is not a concern?

Which cement type is typically used for a ground-supported slab when sulfate exposure is not a concern?

• A. Type 1
• B. Type 2
• C. Type 3
• D. Type 4

Answer: (A)

For a ground-supported slab where sulfate exposure isn’t a concern, the standard general-purpose cement is used. Type I cement is the baseline Portland cement designed for typical concrete needs, providing adequate strength, workability, and durability under normal conditions without the extra cost or altered properties that come with specialty cements. If sulfate exposure were a factor, you’d consider a sulfate-resistant option (such as Type II or other designated types), but that isn’t necessary here. Type II would add some sulfate resistance and reduce heat of hydration, which isn’t needed for ordinary slabs, and Type III focuses on rapid early strength, which isn’t required for a standard ground slab. Type IV is for very large pours where minimizing heat of hydration is critical, which again isn’t the case for a typical ground-supported slab. So, Type I is the appropriate, cost-effective choice.

For a ground-supported slab where sulfate exposure isn’t a concern, the standard general-purpose cement is used. Type I cement is the baseline Portland cement designed for typical concrete needs, providing adequate strength, workability, and durability under normal conditions without the extra cost or altered properties that come with specialty cements.

If sulfate exposure were a factor, you’d consider a sulfate-resistant option (such as Type II or other designated types), but that isn’t necessary here. Type II would add some sulfate resistance and reduce heat of hydration, which isn’t needed for ordinary slabs, and Type III focuses on rapid early strength, which isn’t required for a standard ground slab. Type IV is for very large pours where minimizing heat of hydration is critical, which again isn’t the case for a typical ground-supported slab. So, Type I is the appropriate, cost-effective choice.