Which type of cement sets at a slower rate and is moderate to sulfate attack?

Which type of cement sets at a slower rate and is moderate to sulfate attack?

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

Answer: (B)

The correct answer is Type 2 cement. This type of cement is designed specifically to resist moderate sulfate attacks while also setting at a slower rate compared to Type 1 cement. This slower setting time allows for improved workability and the ability to handle larger pours, making it favorable in applications where the concrete may be exposed to sulfate-rich environments. Type 2 cement's composition includes a lower tricalcium aluminate content, which enhances its resistance to sulfate attack. This characteristic is particularly significant in areas with high sulfate concentrations in soil or groundwater, where conventional cements could be degraded over time. In contrast, Type 1 cement is standard Portland cement without any added sulfates resistance modifiers, type 3 sets quickly and is used for situations requiring rapid strength gain, while Type 4 is designed for low heat of hydration for massive structures. Each of these types has its specific applications and characteristics that differentiate them from Type 2, which balances a moderate setting rate with moderate sulfate resistance.

The correct answer is Type 2 cement. This type of cement is designed specifically to resist moderate sulfate attacks while also setting at a slower rate compared to Type 1 cement. This slower setting time allows for improved workability and the ability to handle larger pours, making it favorable in applications where the concrete may be exposed to sulfate-rich environments.

Type 2 cement's composition includes a lower tricalcium aluminate content, which enhances its resistance to sulfate attack. This characteristic is particularly significant in areas with high sulfate concentrations in soil or groundwater, where conventional cements could be degraded over time.

In contrast, Type 1 cement is standard Portland cement without any added sulfates resistance modifiers, type 3 sets quickly and is used for situations requiring rapid strength gain, while Type 4 is designed for low heat of hydration for massive structures. Each of these types has its specific applications and characteristics that differentiate them from Type 2, which balances a moderate setting rate with moderate sulfate resistance.