A concrete mix that uses two cementitious materials is called which?

• A. Ternary mix
• B. Binary mix
• C. Quaternary mix
• D. Penta mix

Answer: (B)

Mixes are named by how many cementitious binders they include. A concrete mix that uses two cementitious materials is called binary, because binary means two parts. For example, combining Portland cement with fly ash or with slag cement creates a binary mix. If you added a third cementitious material, it would be a ternary mix; a fourth would be quaternary; a fifth would be pentary. So the term that fits a two-cementitious-material mix is binary.