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Road bitumen

Bitumen  is an organic substance with a complex chemical composition. This versatile material has excellent hydrophobic and adhesion characteristics, thanks to which it is widely used in road construction.

Properties

Bitumen do not dissolve in water, but they can dissolve in organic solvents. They belong to amorphous substances, since they have the properties of a liquid in a solid state. The structure has a high density and has no pores, therefore the material is absolutely waterproof and resistant to low temperatures.

The main characteristics of bitumen include:

— the temperature at which the material begins to soften;

— the temperature at which the material becomes brittle;

— extensibility;

— the viscosity measured under specified conditions.

The properties of bitumen are indicated by its marking, where the first number is the softening temperature, and the second is the depth of penetration, that is, the viscosity. For example, BN 90/10 is petroleum bitumen, which begins to soften at 90 ℃ with a viscosity index of 10.

Nomenclature

Viscous bitumens differ: BND (road oil bitumen) and BN (oil bitumen).

Viscous oil road bitumen is produced in five grades: BND 40/60, BND 60/90, BND 90/130, BND 130/200, BND 130/200; oil (BN) - four grades: BN 60/90, BN 90/130, BN 130/200, BN 200/300.

The letters BND mean "petroleum road bitumen", fractions 40/60, 60/90, etc. indicate the permissible for the brand the limits of the penetration depth of a standard needle at 25 ° C, indirectly characterizing the viscosity of bitumen. BND bitumens are distinguished by good adhesion to stone materials and have a sufficiently high plasticity at low temperatures, resistant to climatic influences.

Specifications for viscous petroleum bitumen are standardized by GOST 22245-90.

Viscous oil road bitumen is used for the preparation of hot, warm and cold asphalt concrete mixtures, for surface treatment, impregnation, and also for liquefaction in order to obtain liquid bitumen used for the preparation of cold asphalt concrete, surface treatment and for mixing on the road, etc.

The properties of road bitumen are determined by the peculiarities of its composition and structure. The main indicators of this material are viscosity, plasticity and heat resistance. These indicators are interrelated. With an increase in oil content, an increase in temperature and duration of exposure to loads, the viscosity decreases and the plasticity increases. Resins determine the binding properties of bitumen and tar, give them plasticity, and increase the adhesive ability. Asphaltenes in bitumen and free carbon in tar increase the softening point and hardness.

Viscous bitumens are classified by a particular brand based on three main indicators: the penetration depth of the needle, the softening temperature and the extensibility. The needle penetration depth and extensibility are standardized at two temperatures: 25 °C and 0 °C.


Quality indicators of viscous road bitumen grade BND

Indicator name
BND
200/300
BND
130/200
BND
90/130
BND
60/90
BND
40/60
Depth of needle penetration into bitumen, 0.1 mm:
at 25°С 201-300 131-200 91-130 61-90 40-60
at 0°С 45 35 28 20

13

Softening temperature along the ring and ball, °С, not lower: 35 39 43 47 51
Elongation, cm, not less:
at 25°С - 65 60 50 40
at 0°С 20 6 4,2 3,5 -
Brittleness temperature, ° С, not higher: -20 -18 -17 -15 -10
Flash point, ° С, not lower: 200 220 220 220 220
Adhesion to marble or sand Withstands according to control sample No. 2
Change in softening temperature after heating, ° С, no more: 8 7 6 6 6
Penetration index: +1 - -1 -1 -1
Content of water-soluble compounds,%, no more: 0,2

0,2

0,3 0,3 0,3


 Bitumen BND 200/300 is used for surface treatment of coatings in areas with cold climates, as well as for the preparation of warm asphalt and bitumen crushed stone gravel mixtures.

 Bitumen BND 130/200 is used for surface treatment of coatings in areas with a temperate climate, for impregnation of crushed stone in areas with cold and temperate climates, for the preparation of hot asphalt concrete and bitumen-mineral mixtures in areas with a cold climate.

 Bitumen BND 60/90 is used for impregnation of road crushed stone surfaces in areas with a warm climate, for the preparation of hot asphalt concrete and bitumen-mineral mixtures in areas with a warm climate.

 Bitumen BND 40/60 & nbsp;  is used for the preparation of & nbsp; asphalt concrete and bitumen-mineral mixtures in areas with summer temperatures & gt; 30 °C.

Purchase terms

Our company is ready to organize wholesale and small-scale wholesale deliveries of road bitumen both in Russia and for export.

For purchase questions, please call +7 495 232-52-42, +7 991 232-52-42 (WhatsApp, Telegram) or email: [email protected].