Asphalt concrete is prepared from a special composition with the correct proportions of special components: sand, mineral powder, crushed stone of various sizes, and also a certain bitumen intended for roads. Asphalt mixes are used for laying the foundation and covering the roadway in almost all conditions. You can consider these materials in more detail.
Mixtures of asphalt concrete are divided into hot and cold according to the principle of laying. The first are the most known to date and are actively used. Their laying is performed at a temperature of 140-170 degrees Celsius. The finished asphalt-concrete mixture is hot delivered in a special technique. It saves the temperature of the composition. When the piling is completed, it is compacted by asphalt compactors. After the composition has solidified, a coating is obtained that is of high quality.
Mixtures are prepared using viscous bitumen. The mixture should be used immediately after preparation, it can not be cooled. When laying the temperature of the asphalt should be 120 degrees or more. This technology is used for any work and almost in all latitudes. There are minor features. The upper layers of coatings are laid with the obligatory use of rubble, the fractionality of which is 20-40 millimeters, which affects the total cost of work. Hot mixes asphalt concrete are the most hardy at the moment, which can be achieved through the use of bitumen. This method has another very important advantage - the opening of the movement along the treated area is possible immediately after the mixture has cooled to ambient temperature, that is, it takes only a few hours. This period is sufficient for the mixture to pass through the forming phase, after which it is completely ready for operation.
If asphalt mixtures are selected as a material for the repair work on the road surface, then their composition should be chosen as close as possible to the composition to be repaired. If the depth of the defect is up to five centimeters, one layer is laid, and with a larger pothole size, a pair of layers should be used. The surfaces of small areas need to be compressed by means of pneumatic equipment, and more extensive ones - using a vibrating roll.
Different types of asphalt-concrete mixtures are used for arrangement of airfield and road surfaces, hydraulic structures, floors and flat roofs. The purchase of such materials must be carried out at enterprises operating with strict observance of all technological features of their manufacture, and the cost will be optimal. It is clear that the fine-grained asphalt-concrete mixture will cost more, as it is a better product, designed for the arrangement of very smooth surfaces. In general, the cost of such a building material depends on many factors, among which very important are the quality of the components, equipment and technologies used in the work, as well as a number of other factors.