At first glance it may seem that the choice of sand - a simple thing, bought a bag that says "building sand" - that is the aggregate for concrete and dumping for the track and decor.But this approach is wrong.There are various types of sand, and for each kind of construction work is necessary to select the optimum variant.
There are several classifications of sand, but we will not affect the classification based on geological features sands.We are interested in the classification adopted in the building materials market.
First of all, you should know that the sands are natural and artificial.Natural formed by the natural destruction of rocks, artificially created by the crushing of rocks, such as limestone, marble, granite and other minerals.When purchasing an artificial sand, you have to be careful to require certificates and the results of radiation survey, as there is a risk that the material will be radioactive, especially sand, derived from granite.
of artificial sand one of the most sought a
large quartz sand fractions used for decorating various venues, such as children or the golf course.The mixture intended for the decorative finishing of buildings are added tinted quartz sand, and by the addition of silica sand to the concrete solution can receive concrete soft pastel hues.High sorption ability of quartz sand allows its use in filters for various purposes.Use of this type of sand and sand blasters.
quartz sand, past the processes of cleaning and enrichment, known as molding sand, the particle size - from 0.16 to 0.18 mm.The main area of application - Foundry, which is used to manufacture molds and rods.Also, this sand is used in the manufacture of glass, porcelain, ceramic, adhesive bonding agents and compositions.Used foundry sand, and in the construction of water treatment plants, and of course in construction.
By artificial sand can also include perlite and termozitovye Sands, increasingly used not natural, and in the expanded (aerated) form.Perlite get crushing of glassy rocks of volcanic origin, termozitovye - crushing slag pumice.Resulting from these sands after heat treatment porous materials are widely used as a filler for lightweight concrete mixtures, as bulk insulation in road construction, agriculture, landscaping and plant.
to a relatively rarely used artificial sand sand include marble, granite and shungizitovy.Marble nihodit its application in the production of ceramic tiles, shingles, production of concrete and mosaic floors.Landscape designers use to create the decor of granite sand, and it is used in a variety of filters.Shungizitovy sand - the result of crushing burnt shungit, it can be used as a porous filler has thermal insulation properties.
natural sand are separated by type of origin (bedding) and a method of processing (alluvial and screened).By type of occurrence can be distinguished career (mountain, ravine), river and sea sand.Sometimes this classification is added building sand, in fact, a "building" refers to the most common sand - river and career.
extractive open pit quarry sand contains large amounts of impurities: stones, clay and fines.In its natural form such sand can only be used for sprinkling the foundation trenches or dumping.For further use of quarry sand screened or washed, cleaned of impurities.The sieved sand can be used in plaster and foundation works for the manufacture of a solution for masonry, to form ties for the preparation of asphalt mixtures.
alluvial sand quarry in the processing of water is cleaned of mud and coarse fractions.As a result, there are only small particles (about 0.6 mm) and a sand for plaster for interior decorating, for the manufacture of bricks and concrete.
As regards the application of sand with fractions of different sizes, the best is the use of size 5 mm solution is applied at installation of reinforced concrete structures and filling joints when installing the panels.The solution prepared for masonry, sand goes no larger than 2.5 mm and is suitable for decorating sand is not more than 1.25 mm.
River sand is extracted from the bottom of the river with the help of dredgers.This type of sand is not a part of impurities, stones and clay, so is considered more versatile.This type of sand can be used for cement screeds, concrete mixing, for drainage facilities and water treatment filters.It should be noted that in the preparation of river sand cement mixture is deposited quickly, so the mixture has to be stirred.Because of this particular river sand in this case, is often replaced by a career.River sand is slightly more expensive than a career.
Sea sand is extracted from the seabed by hydraulic shells.This sand is in the process of production is processed, including washing, concentration and refining, and then held hydromechanical processing.After treatment with sea sand can be considered a high quality building material.It is used in the preparation of mortars, as a filling grout, to manufacture plasters, screeds, masonry.
sea sand has high decorative qualities, its rounded grains of a uniform value of landscape designers willing to use in their compositions.Unfortunately, the sea sand has a high price, so now is conducted to develop new methods of mining of sea sand, which would reduce its costs.
Radioactivity almost all natural sand is very low, they are safe for health, but to make sure that the seller offers a truly natural safe raw materials, it is useful to require in this case, certificates and examination.