# What is VFA in asphalt?

**Asphalt**(

**VFA**)

**VFA**is the percentage of voids in the compacted aggregate mass that are filled with

**asphalt**cement. It is synonymous with the

**asphalt**-void ratio.

Similarly, you may ask, what is VMA in asphalt?

Let's look at **VMA**, which stands for “Voids in Mineral Aggregate.” **VMA** is the space between the rocks that can be filled with **asphalt**. The space filled with **asphalt** is known as VFA (Voids Filled with **Asphalt**). The remaining space is air voids.

Furthermore, how do you calculate air voids in asphalt? This volume is typically quantified as a percentage of **air voids** by volume and expressed as “percent **air voids**”. 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**.

Consequently, what is effective asphalt content?

Total **asphalt content** is the amount of **asphalt** that must be added to the mixture to produce the desired mix qualities. **Effective asphalt content** is the volume of **asphalt** not absorbed by the aggregate; the amount of **asphalt** that **effectively** forms a bonding film on the aggregate surfaces.

How do you calculate voids in mineral aggregate?

**CALCULATION** VMA = **Voids in mineral aggregate**, in percent of bulk volume, Gsb = Bulk specific gravity of the **aggregate**, Gmb = Bulk specific gravity of compacted mix, Ps = **Aggregate**, percent by total weight of mix. Where: P1 = Percent by weight of **aggregate** 1, etc., G1 = Bulk specific gravity of **aggregate** 1, etc.