What is the approximate weight of concrete per cubic foot?

What is the approximate weight of concrete per cubic foot?

• A. 120 lbs
• B. 130 lbs
• C. 150 lbs
• D. 180 lbs

Answer: (C)

Unit weight (density) of concrete is about 150 pounds per cubic foot for normal structural mixes. This is the standard reference used in calculations for forms, loads, and overall design because typical concrete, with cement, sand, gravel, and water, weighs about 150 lb for every one cubic foot. While there are lighter mixes (a bit under 150) and heavier, specialty concretes (which can approach or exceed 180 lb/ft³ with dense aggregates), the common, everyday concrete used in construction sits around that 150 lb/ft³ mark.

Unit weight (density) of concrete is about 150 pounds per cubic foot for normal structural mixes. This is the standard reference used in calculations for forms, loads, and overall design because typical concrete, with cement, sand, gravel, and water, weighs about 150 lb for every one cubic foot. While there are lighter mixes (a bit under 150) and heavier, specialty concretes (which can approach or exceed 180 lb/ft³ with dense aggregates), the common, everyday concrete used in construction sits around that 150 lb/ft³ mark.