Sand - a loose mixture of grains of irregular shape, formed as a result of destruction of solid rock. The predominant mineral is composed of sand - quartz.
Any particulate material (sand, broken stone, gravel, soil and so forth. ) During loading, unloading, and delivery has a loose, neuplotnonnoe state, whereby both at budget normalization installation of foundations, as well as in road construction - always implies the amount of sand in view of the expanded state.
In a preliminary calculation of the construction costs and the correct preparation of cost estimates, one of the important conditions is considered to be the correct definition of the compaction factor.
Why is it better to make an order in terms of volume?
First, the calculation of the bulk material to any construction work (foundation, backfill, a blind area and so on.) Made in cubic meters.
For ease of calculation, the translation of cubic meters per ton, or vice versa, you can use the following table:
When purchasing in mass units (tonnes) - there is a possibility of erroneous calculation of the impossibility of accounting degree moisture content, and thus the weight, resulting in a smaller amount will be delivered to the object than anticipated.
Secondly, if we refer to building codes (SNIP), the compression rate varies from loose materials the volume of material (In particular, sand compaction ratio from 0.98 to 0.92 from the volume!)
To date, there are a number of organizations that work directly with a career and have the ability to both calculation and shipment of bulk materials in cubic meters. One such raw material suppliers is OOO "MSK-AvtoNerud".
Theoretically, it is possible to use the compaction factor of SNIP, but from a practical point of view, it is necessary to lay on 25-30% more than the estimated amount of value, due to the following factors:
- Feature place of construction: the car does not always deliver the bulk material directly to the site and forced to perform unloading in the territory of reference works (building site). During migration of sand or gravel, a significant portion of the bulk material is mixed with the soil and compacted, whereby is formed unusable material.
- The density of the delivered raw material depends on the production site (carrier) and composition of the rocks (small / middle / large etc.), therefore, each material has a "his" shrinkage, as you can also check with a specialized staff company.
Why is it important to take into account the shrinkage?
You have at the facility under construction. Work laid out, and the last day of the work carried out five days delivery for 20-30% less than the volume of sand from the calculated. Agree, do not always get a prompt to deliver the goods to the place!
Since all the above facts are confirmed in practice, the conclusion is as follows:
1. When ordering bulk material actually required volume of 30% more than calculated.
2. In case of shortage of material and in order to avoid idle brigade, it should be possible operative delivery material.
If the first point of order the onus is on you, prompt delivery depends on the carrier.
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The material was created with support of OOO "MSK-AvtoNerud"
Prompt delivery of non-metallic building materials in Moscow and Moscow region 24/7: http://msk-avtonerud.ru/