According to CALTRANS specifications, how many pounds of Portland cement should be used for one cubic yard of Class A concrete?

According to CALTRANS specifications, how many pounds of Portland cement should be used for one cubic yard of Class A concrete?

• A. 500 lb
• B. 564 lb
• C. 600 lb
• D. 750 lb

Answer: (B)

In CALTRANS specifications, the amount of Portland cement for a cubic yard of Class A concrete is fixed to ensure the mix achieves the required strength and workability. For Class A concrete, CALTRANS specifies 564 pounds of cement per cubic yard. That equals six standard 94-pound sacks of cement (6 × 94 = 564). This value is the official target used in mix design and field practice. The other options don’t match the published target: 500 pounds is about 5.32 sacks, 600 pounds is about 6.38 sacks, and 750 pounds is about 7.98 sacks—none of which align with the Class A specification.

In CALTRANS specifications, the amount of Portland cement for a cubic yard of Class A concrete is fixed to ensure the mix achieves the required strength and workability. For Class A concrete, CALTRANS specifies 564 pounds of cement per cubic yard. That equals six standard 94-pound sacks of cement (6 × 94 = 564).

This value is the official target used in mix design and field practice. The other options don’t match the published target: 500 pounds is about 5.32 sacks, 600 pounds is about 6.38 sacks, and 750 pounds is about 7.98 sacks—none of which align with the Class A specification.