Gravel - one of the most inexpensive and popular construction materials. It is got in open pits and has many indisputable advantages. Not to confuse gravel with crushed stone, it is necessary to know in what difference of these stones.
Instruction
1. Gravel represents fragments of stone breed. Mainly it is granites, sandstones, limestones and diabases. Extract gravel in the open career way on sand-gravel fields. These stones happen the different size and are inexpensive and demanded construction material. They are used as filler at concrete preparation, in road construction, for paving of paths and platforms in private enterprises. After extraction of sand-gravel mix the elimination of sand and sorting of stones according to the most popular fractions is made. In construction of buildings and roads it is the size of 20/40 mm.
2. What does gravel differ from crushed stone in? This two types of stones often confuse. However, the difference between them is, and essential. Both of these products are inorganic bulk. But gravel is formed as a result of natural breaks of stone breeds, and crushed stone – a product of their artificial crushing. Gravel mainly roundish, and crushed stone form most often peaked.
3. All about gravel. These stones happen various color: gray-blue, dark gray, brown, black, yellowish and pinkish. Many of them are fancifully combined and have property to change a shade depending on degree of humidity of air or illumination. For this reason gravel is a favourite of landscape designers who use it for dressing of gardens and farmsteads, upclassing of beds, the device of walking paths. The form of stones of any size integral, in them never happens cracks.
4. In the nature there are three main fractions of gravel: small (1-3 mm), average (3-7 mm) and large (7-12 mm). These stones contain a set of impurity – particles of clay, sand, dust and dirt. Depending on the field distinguish different types of gravel: lake, mountain, sea, river, glacial, etc. Cleaner stones – sea and river. A surface at them smooth therefore they are widely used in laying and dumping of roads.
5. In construction of houses and constructions prefer as mountain gravel as it possesses rougher surface and, therefore, provides the best coupling in concrete mixes. Small fractions of stones is some of some types of roofing materials making in production. Gravel has the first class radioactivity and for this reason is absolutely safe for human health and animals. It was one more reason of its popularity in different types of works.