Sand is used in various fields of construction, so it is very important to know how to correctly calculate the required amount of this material. If it is measured by volume, it is very important to take into account such an indicator as the coefficient of compaction of sand (abbreviated Purch). In this calculation, one cannot do without it. This indicator is important in order to understand how much compaction has occurred.
Material volume
A number of external factors, such as the method and range of transportation, can affect this parameter. To avoid changing the volume of sand, it is necessary to completely protect it from mechanical damage, as well as from the penetration of moisture and foreign elements. Verification of the specified material should take place immediately upon receipt, so that later the recipient does not have claims to the supplier.
The calculation of this parameter is not complicated. To do this, multiply the actual volume of the material by the sand compaction factor. There is a purchase already established by GOST 9757-90. It should not be higher than 1.15. To determine the actual volume, it is necessary to measure the volume of the body, however, this takes the real height of the material, not the sides.
Sand compaction factor
This indicator depends on:
- Temperature and humidity. For example, frozen clods may appear in winter. Their volume is also taken into account.
- Conditions of carriage.
- The classification of the material according to GOST 8736-93 and GOST 25100-95, where its natural humidity and density are indicated, is important.
- The sand compaction factor also depends on where it was obtained. For example, this material from a quarry differs from that extracted in the stack.
It is very important to consider the coefficient of relative compaction of sand. This indicator is necessary for the specified calculation. Basically, it represents the ratio of the density of the “dry” material (skeleton). In this case, the sand compaction factor (SNiP 2.05.02-85) to the same parameter in the source of production is taken into account.
The calculation depends on several factors:
- From the characteristics of the source where the material was obtained (hydraulic washing, quarry).
- From climatic conditions.
- From the transport scheme for the delivery of material to the laying place.
- From the passport data of the source. It records data such as the characteristics of sand, its natural density and humidity, and so on.
Tip
To determine other indicators, you need to take the right amount of test material from a depth of about 20-25 cm from the surface and at least 50 cm from the walls of the body. This is important for research. Samples of this material should be in accordance with GOST 12071-84. Each of them must also have an accompanying label on which the necessary data must be indicated. Keep in mind: in order to protect yourself from additional costs during work, you must always correctly calculate the amount of sand. The value of the sand compaction coefficient is very important in road construction, since the strength of the structure depends on this.