Pavements made of bitum aggregates, often called smołospoin, They are widespread and recommended for use in green areas. They are usually built for pedestrian traffic on 10-15 a centimeter plowing foundation or on various properly prepared old surfaces. The thickness of the road for roads of low weight is used for road traffic surfaces 20-24 cm.
The aggregate for the surface covered with a bituminous binder is called bituminous mass. Such masses are prepared hot in special databases-, usually located a short distance from construction yes, that it is possible to transport hot masses to the road construction site.
A distinction is made between five types of bituminous masses that differ in granation and the type of aggregate, The first three types (nr 1, 2 i 3) These are grass masses with grain 0-5, 5-16 i 16-25 mm. Mass No. 4 i 5 it is a bitten -bitten granted 25-40 i 40-50 mm.
MAS NO 4 i 5 It is most often used in the construction of multi -layer surfaces, as a foundation under the surface layer of surface (rug) laid from bitum grits. Road traffic surfaces, whose foundation is a 10-15-centimeter layer, can be made of bitum aggregate, folded in one or two layers. If the foundation surface is smooth enough, You can arrange one layer of the smallest bitum grits on (Table no 1) thickness 2-3 cm. In order to better fuse such a rug with a foundation, you can spray the tar spray. If the foundation surface has high inequalities after being used, It is necessary to make a rug from two layers: first a layer of mass of the thickest grits is unfolded (Table no 3) thickness 3 cm, and then, After the charm - the upper layer of thickness 2-3 cm from mass No. 1.
Two layers of bitum aggregate: 1 - debris or crushing; 2 - Mass no 3; 3 - Mass no 1.
The amount of bituminous mass needed to build the surface is determined by weight. To ensure adequate cohesion, its layer must have the right thickness. So the amount of weight No. 1 cannot be less than 20 kg/m², mass No. 2 - than 30 kg/m² i masy nr 3 than 40 kg/m².
The big advantage of the surface of bituminous masses is the porous structure, enabling the penetration of the defect and air, which is quite important in garden conditions. Sometimes, however, the permeability of such a surface may be undesirable and then in order to seal it is sprayed with stabilized tar (cold), and then sprinkles with gravel or grave with grain 2-5 mm. After sprinkling with grit, which causes better anastomosis of this aggregate with mass. It is very highly advisable to use bright stones, Therefore, it is obtained to brighten the black color of such a surface.