Specific performance admixtures are the admixtures that can provide a desired performance characteristics other than:

• A. Reducing water content
• B. All of these
• C. Changing the setting time
• D. Changing the functionality

Answer: (B)

Specific performance admixtures are used to tailor concrete to achieve properties beyond the basic changes like lowering water content, altering the setting time, or changing general workability. In practice, these additives are chosen to deliver targeted durability and long‑term performance—things like improved freeze–thaw resistance, reduced permeability to guard against chloride intrusion, control of shrinkage cracking, enhanced surface finish, or increased abrasion resistance. The question asks for performance characteristics beyond the ones listed, and that broad capability is captured by selecting “All of these.” It signals that there are multiple potential targets for specific performance admixtures, not just the three listed.