Knowledge of features and use of seeded sand is very important for any modern person. After all, the scope of use of dry career sand is not limited to the construction. And even if we just talk about the construction sand in bags, it is still a very important and interesting substance that deserves close review from all sides.
What it is?
For any geologist, sand – just “one of the varieties of fine-skilled fractions of rocks”. To the finely skiard fractions themselves, however, a variety of impurities are added.
Among them, clay, crushed stone and dust-like particles play the greatest role. In natural form they look great and form one of the most valuable breeds on Earth. However, to use for practical purposes, the sandy mass is impossible.
For any works, only seeded (freed from mechanical impurities) sand. Extraction of the original raw materials are produced in sand and mixed (sand-gravel) quarries. In the overwhelming majority of cases, they are developed by the open method. In the hydromechanical treatment, the breed mass is developed under strong water pressure. “Wet” option implies extraction of dredge in reservoirs.
The problem is that Only “career” technique, with a rare exception, economically inexpract. Breed processing is often made directly in place. However, only careful sifting and washing (possible, notice, only in the conditions of prepared production, with the “carious” sinks) allows you to guarantee excellent quality of raw materials. Failure from washing is also practiced – in some cases, the final customer is needed by sand seeds with the inclusion of sludge and clay particles. If the task is raised to increase the bulk as much as possible, the drying is practiced by gases.
The main properties of the seeded sand are the size module and filtration index. Linear grain sizes are determined, first of all, the dimensions of the cells in industrial sines. From how great grain, the area of use of the material depends. It is customary to classify sand as follows:
- Large grain – 3.5;
- The average fraction is 2.8;
- Small grain – 1.54
- The substance of the fine fraction is less than units.
It is believed that the filter coefficient is associated with the grain value. But another factor affects him, first of all, the number of clay substances. After careful flushing, the clay completely disappears. This repeatedly increasing the intensity of filtration processes. Sometimes it can be achieved 10 m in 24 hours.
Seeded sand is distinguished from other types of very high bulk density. It is believed that the standard sand mass this indicator reaches 1650 kg per 1 m3. But after high-quality sifting, it increases to 1800 kg per 1 m3. Besides, Pass through a series of sieves will accurately increase filtering quality.
Since the material ceases to delay water, it is more stable and able to transfer even severe cold.
Continuing the story about the career seeded sand, it is worth indicating it Excellent environmental properties. After all, the chemical-physical composition of the substance is normalized, and therefore there should be no problems with its operation. After proper standard processing, the proportion of foreign impurities does not exceed 9% by weight. Often, sown dry construction sand shipped in bags of 25-50 kg. However, it is also practiced shipment in bulk in the body of trucks or in the so-called Big beta (MKR) of 1000-1500 kg (of course, it is suitable, rather, for large buildings).
Well treated sand little more expensive raw materials. However, it is used much more. In the overwhelming majority of cases, customers are interested in sandy raw materials with a fraction of 2 -2.5 mm. Not only filtration capacity depends on the purity of the product, but also wear resistance (even as part of a frozen solution). Specific use of sand depends on its fraction first.
Parties with the finest structure are in demand by plants supplying dry mixes on a plaster basis. After all, the smaller the grains, the “elegant” the texture of the finished mixture after laying will be. Just fine sand is needed to make brick (it is used as an additive to clay). Also this faction appreciate manufacturers of plaster, building mixtures and solutions.
If you once have to build something yourself, then it is necessary to look for it.
But you should not believe that the sand with large grains is not interested in anyone. The situation is exactly the opposite way! The coarse-grained career product is part of a particularly durable concrete and various solutions for masonry. Their plasticity when adding such a component increases.
This material is also in demand:
- in the creation of reinforced concrete structures (including rings for wells);
- in the production of paving slabs and borders;
- as a component of asphalt concrete;
- as a subflink under the road fabric;
- as an important component of drainage systems;
- as auxiliary raw materials in various construction;
- in filters of water and sewer systems;
- as a sprinkling of roads and sidewalks in the threat of ice;
- With the improvement of various sites (in landscape design, as they say);
- as a component for planting soil.
The cost of seeded sand is determined not only by its purity and fraction, but also the location of the career. The further he from the consumer, the more expensive, naturally, the transportation costs. It is also worth considering the influence of the packing method. Even with other things being equal, it determines the difference in price from 5 to 30%. Moreover, the seasonal factor, the situation on the market, the scale of the order, the possibility of organizing self-delivery.
Washed seeded sand in any case exceeding his river analogue. The more processings are carried out, the higher the product characteristics. Granules from 1.6 to 2.4 mm are perfect for the formation of cellular concrete. But for lightweight concrete, this material will be useful.
If necessary, professionals give all possible advice.
Even more about the features of the seeded sand, see the following video.