Formula for Air Voids?

Percentage of air voids in the soil is obtained by dividing the volume of air to the total volume. This is expressed in percentage. When the soil is fully saturated, the percentage of air voids is equal to zero. Where Va= Volume of air.

How do you calculate air void?

Percent air voids is calculated by comparing a test specimen's bulk specific gravity (Gmb) with its theoretical maximum specific gravity (Gmm) and assuming the difference is due to air. Once Gmm is known, portable non-destructive devices can be used to measure HMA density in-place.

What is the formula for air content?

Air Content – Air content is calculated by subtracting the unit weight, ρ, from the theoretical unit weight, T, divided by the theoretical unit weight, T, multiplied by 100 as shown below. Example: Theoretical Unit Weight = 151.7 lbs./cu.