Fly ash may be added to concrete from a fly ash silo at the batch plant or from a silo containing a ______ cement.

Fly ash may be added to concrete from a fly ash silo at the batch plant or from a silo containing a ______ cement.

• A. Slag cement
• B. Portland
• C. Aluminous cement
• D. Hydraulic cement

Answer: (B)

Fly ash is used as a supplementary cementitious material and is blended with the main cementitious binder in concrete. In typical batch plant practice, the fly ash is added with Portland cement, which serves as the standard base binder for ordinary concretes. The Portland cement provides the calcium hydroxide that fly ash reacts with during hydration, forming additional cementitious compounds that improve strength and durability. Other cement types exist, but they are not the usual base binder paired with fly ash in standard mixes, so the most common and appropriate fill for the blank is Portland cement.

Fly ash is used as a supplementary cementitious material and is blended with the main cementitious binder in concrete. In typical batch plant practice, the fly ash is added with Portland cement, which serves as the standard base binder for ordinary concretes. The Portland cement provides the calcium hydroxide that fly ash reacts with during hydration, forming additional cementitious compounds that improve strength and durability. Other cement types exist, but they are not the usual base binder paired with fly ash in standard mixes, so the most common and appropriate fill for the blank is Portland cement.