What is apparent specific gravity?

2.1 Apparent Specific Gravity—Apparent specific gravity is the ratio of the weight in air of a given volume of the water impermeable portion of a permeable material at a stated temperature to the weight in air of an equal volume of distilled water at a stated temperature.

What are the two types of specific gravity?

Therefore, two types of specific gravities are defined: one is the absolute specific gravity, and second is the apparent specific gravity. In the determination of true or absolute specific gravity, both the permeable and impermeable voids are excluded.

What is the distinction between apparent and bulk specific gravity?

“Specific gravity” is a (perhaps poorly named) term for the mass per unit volume of a material. It only applies to the bulk state (not to individual atoms or molecules). Apparent 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.

Is apparent specific gravity greater than bulk specific gravity?

The Gsb SSD (bulk specific gravity at SSD) will always be the intermediate value, and the Gsa (apparent specific gravity) will always be the highest, since the volume calculated includes only the “solid” aggregate particle (does not include those voids permeable to water).

What is the difference between apparent density and bulk density?

Apparent density is the bulk density of the powder. It provides the mass per unit volume of loose packed powders. A change in apparent density can also indicate a change in the surface roughness of the powder; for example, atomization satellites may reduce apparent density.

What is the importance of apparent specific gravity?

Specific Gravity is important for several reasons. Some deleterious particles are lighter than the good aggregates. Tracking specific gravity can sometimes indicate a change of material or possible contamination.

Which aggregate specific gravity is larger apparent or bulk?

What is meant by apparent density?

Apparent density (pb) is the ratio between the apparent volume and dry specimen mass of a soil sample. The volume is limited by external specimen forces which include voids. Therefore, it is measured in kilograms per cubic meter (kg/m3).

What is the difference between wet density and dry density?

The relationship between dry density and wet density is: dry density = wet density divide by (1 + moisture content as a fraction). e.g., Moisture content is 10\%. Wet density is 110 pcf, then the dry density is 110/1.1 = 100 pcf.

Why is the specific gravity on OD and SSD different?

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 fine aggregate and coarse aggregate in respect of specific gravity and absorption?

Fine aggregates are small size filler materials in construction. Coarse aggregates are larger size filler materials in construction. Fine aggregates are the particles that pass through 4.75 mm sieve and retain on 0.075 mm sieve. Coarse aggregates are the particles that retain on 4.75 mm sieve.

How do you calculate specific gravity?

To calculate specific gravity, you divide the density of the substance by the density of water at 4 degrees Celsius , since water achieves its maximum density at this temperature.

How to calculate specific gravity.?

Calculating Specific Gravity The following formula is used to calculate the specific gravity of a material. SG = ρ / ρW Where SG = specific gravity, ρ = density of the material (kg/m 3), ρW = density of water (kg/m 3).

What are the effects of specific gravity?

Only if the specific gravity of the liquid is very low or very high will the flow change by more than 10 percent from that of water. The effect of specific gravity on gases is similar. For example, the specific gravity of hydrogen is 93 percent lower than that of air, but it changes flow by just 74 percent.

How is specific gravity defined?

medical Definition of specific gravity. : the ratio of the density of a substance to the density of some substance (as pure water) taken as a standard when both densities are obtained by weighing in air.