Why are nonmetallic materials and crushed stone valued?
Crushed stone is used in construction for a long time. It is an artificial material with non-rolled sharp grains, which are obtained after crushing rock, artificial stones or large natural gravel. It is granite, limestone, gravel. Rubble using sieving subjected to division into fractions. The surface of grains of crushed stone is rough, has an acute-angular form, so it is well set with the cement mortar in the manufacture of concrete. Find out the tricks of unscrupulous suppliers of rubble, you can here on the website nbt.su.
It is mainly used in road construction and as a concrete aggregate.
Concrete is a building material that is obtained in the process of hardening a mixture of cement, as a binder, special aggregates and water. Sometimes concrete may contain additives.
Fine aggregates are artificial and natural sand. Before use, the sand is washed so that dust and foreign particles do not deteriorate the properties of the concrete. Grains of sand should be up to 5 mm.Artificial sand is obtained after crushing heavy rock. It is important to determine the quality of the sand, which depends on its density, humidity and modulus of size. It is also important to know the shape of the grains of sand and its roughness. The condition of the sand must meet the requirements of a certain GOST.
The second component of the concrete mixture is considered a large aggregate, which is used as artificial or natural crushed stone. Grains should be between 5 and 70mm.
Introduced additives improve the quality of the concrete mix, improve its performance and technical indicators.
The main properties of concrete are: the ability to maintain uniformity of the mixture during unloading and transportation, as well as uniformity and ability to retain water. Concrete must be well mixed, but at the same time have resistance to separation and water separation.