# What is the bulk specific gravity?

## What is the bulk specific gravity?

Bulk Specific Gravity (also known as Bulk Dry Specific Gravity): The ratio of the weight in air of a unit volume of aggregate at a stated temperature to the weight in air of an equal volume of gas-free distilled water at the stated temperature.

What is specific gravity and bulk density?

Specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance. Bulk density is weight of a unit volume of a material to the same volume of water including voids.

What is specific gravity in simple words?

specific gravity, also called relative density, ratio of the density of a substance to that of a standard substance. Because it is the ratio of two quantities that have the same dimensions (mass per unit volume), specific gravity has no dimension.

### Is apparent specific gravity the same as bulk density?

Bulk density of material is not equal to it’s specific gravity as specific gravity is weight of FULLY COMPACTED material per unit volume.

Why is bulk specific gravity important?

Bulk specific gravity of aggregate is important information for designing hot mix asphalt because it is used to calculate voids in mineral aggregate and voids filled with asphalt. Periodically, the aggregate is lightly tamped into a cone-shaped mold with 25 light drops of the tamper.

What is the difference between specific gravity and bulk specific gravity?

Relationship with Other Specific Gravities Both use the aggregate’s oven dry weight. The difference between Gsb and bulk (SSD) specific gravity is the weight of aggregate used in the calculations. The difference between these weights is the weight of absorbed water in the aggregate’s permeable voids.

#### What is the difference between bulk specific gravity and specific gravity?

The difference between Gsb and bulk (SSD) specific gravity is the weight of aggregate used in the calculations. The difference between these weights is the weight of absorbed water in the aggregate’s permeable voids. Both use the same aggregate volume.

What is the difference between bulk specific gravity and theoretical maximum specific gravity?

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. This bulk specific gravity is then compared to the most current theoretical maximum specific gravity to determine air voids.

Why is it called specific gravity?

Originally Answered: Why is specific gravity called “specific” gravity? Its specific because, it is specific to water. If I say specific gravity of an object is 1.3. It means its density is 1.3 times that of a SPECIFIC substance which is water!

## How do you calculate specific gravity in bulk?

The bulk specific gravity of a compacted asphalt mix specimen is determined by computing the ratio of its mass in air to its bulk volume.

What is the bulk specific gravity of fine and coarse aggregates?

Typically, aggregate used in HMA production will have a bulk specific gravity between about 2.400 and 3.000 with 2.700 being fairly typical of limestone.

How do you calculate bulk specific gravity of asphalt?

Gmb = bulk specific gravity of compacted mixture. (KT-15) Ps = aggregate, percent by total dry weight of mixture. Calculation using data from Table 1 and section 3.2. VMA = 100 – (2.344 x 93.04) 2.652 = 100 – 82.23 = 17.77 Calculation using data from Table 1 and section 3.2.