Density, apparent density, bulk density and bulk density determination method - Database & Sql Blog Articles

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(1)

density

Density refers to the mass per unit volume of a material in an absolutely dense state. Calculated as follows:

In the middle

  ——

The density of the material,

g/cm3

;

î—¥ î—¥ m -

The quality of the material (dry to constant weight),

g

;

î—¥ î—¥ V -

The volume of the material in an absolutely dense state,

Cm3

.

î—¥

Except for a few materials such as steel and glass, most materials have some pores inside. When determining the density of porous materials (such as bricks, stones, etc.), the material should be ground into a fine powder. After drying, the absolute compact volume is measured with a Lee's bottle. The finer the material is ground, the more accurate the measured compact volume value.

î—¥

In addition, the concept of specific gravity is often used in engineering. The specific gravity is also called the relative density. It is the quality of the material and the same volume of water (

4

°C

The ratio of the mass indicates that there is no unit and its value is the same as the material density (

g/cm3

).

(2)

Bulk density

î—¥

Bulk density refers to the mass of a material in a natural state (including the material entity and its open pores, closed pores), commonly known as bulk density. The bulk density can be calculated as follows:

î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥

In the middle

 ρ0——

The bulk density of the material,

Kg/m3

or

g/cm3

;

î—¥ î—¥ m -

Quality of materials,

Kg

or

g

;

î—¥ î—¥ V0 -

The volume of the material in its natural state, including the material entity and its open pores, closed pores, see

1

-

1

,

M3

or

Cm3

.

î—¥

For the volume of the regular shape material, it can be measured with a gauge. For example, the volume of the aerated concrete block is the axial dimension of the length, width and height in one piece, and the volume is calculated. For the volume of the irregularly shaped material, it can be measured by a liquid discharge method or a sealing wax discharge method.

î—¥

The bulk density refers to the dry mass of the material particles per unit volume (including the physical mineral composition of the material and its closed pores, open pores, etc.). Since the quality refers to the quality of the test piece after drying, it is also called dry bulk density.

(3) Bulk density

Bulk density refers to the mass of material particles per unit volume (containing solid particles and their closed mouth, open pore volume and interparticle void volume), and has a dry bulk density and a wet bulk density. The bulk density can be calculated as follows:

î—¥ î—¥

In the middle

 ——

Bulk density,

Kg/m3

;

m ——

Quality of materials,

Kg

;

 ——

The bulk of the material,

M3

.

(4)

Apparent density

î—¥

Apparent density refers to the dry mass of material particles per unit volume (including material entities and closed pore volumes), also known as apparent density. Calculated as follows:

î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥ î—¥

In the middle

ρ'——

Apparent density of materials,

Kg/m3

or

g/cm3

;

  m ——

Quality of materials,

Kg

or

g

;

î—¥ î—¥ V' -

The volume of the material in the condition of closed pores (ie containing only internal closed pores, without open pores), see figure

1

-

2

,

M3

or

Cm3

.

Typically, the material is measured by volumetric displacement or water weighing in a volumetric form containing closed pores.