The minimum cementitious material for bridging deck is expressed in which unit?

• A. lbs/cu yd
• B. kg/m3
• C. lbs/ft3
• D. kg/cu yd

Answer: (A)

Cementitious content is specified by how much cementitious material exists per unit volume of concrete, using US customary units. This is expressed as pounds of cementitious material per cubic yard, which matches how concrete is typically batched and specified on jobsites and in standard mix designs. Using pounds per cubic yard aligns with field practices because mixes are designed and delivered by the cubic yard, making the content easy to compare and apply on-site. Metric units (kg/m3, kg/cu yd) are not the standard for this context in US practice, and expressing it per cubic foot (lbs/ft3) doesn't align with common batch proportions. So the minimum cementitious material for bridging deck is expressed in pounds per cubic yard.