If the Unit Weight Coefficient is 1.0, what is the weight range of a cubic foot of concrete for design purposes?

When the Unit Weight Coefficient is set at 1.0, it means that the density of the material is being compared to water, which has a weight of 62.4 pounds per cubic foot. For concrete, the typical weight range is based on its density, which can vary depending on the mix, but for standard concrete, the weight is commonly established around 150 pounds per cubic foot.

In practice, the weight of concrete used in structural design is often approximated to be around 150 pounds per cubic foot. This is important for calculating loads in construction and ensuring that structures can support their own weight as well as additional loads.

The range of 140-150 pounds per cubic foot includes the lower end for lighter concrete mixes while still representing standard concrete weights effectively. Thus, in the context of this question, the correct response reflects the typical design weight of concrete commonly used in construction, aligning it with standard practice and engineering guidelines regarding material density.