SU1248986A1 - Asphalt-concrete mix - Google Patents

Description

eleven

The invention relates to the field of road construction materials, and can be used for road and airfield paving.

The purpose of the invention is to increase the crack resistance and water resistance of asphalt concrete.

 Magnetite-containing waste — tails of stage I of wet magnetic separation 5 fractions less than 0.5 mm are mixed with fatty acids — waste products from the production of Sebacic acid and grinding before grinding in a grinding installation. The resulting activated mineral powder is mixed with a mineral filler - sand and bitumen,

Tails stage 1 wet magnetic | Separation have the following chemical combination, wt.% .:, 30-47,26;

 13.87-14.58; CaO 13.64-15.49; MgO 3.94-4.34; FeO 5.24-7.12; 5.80-8.97.

Tails of stage I wet magnetic separator: they have the following mineralogical composition, wt.%:

Magnetite 2.0-6.0

Sulphides 0.5-1.0

Hydroxides

iron-nmatematite

Field Hapat

Calcite

Iron silicates Quartz

0.5-1.5

31.5-35.0

0.5-2.0

56.5-57.5

1.0-2.0

According to the grain composition, tails of the first stage of wet magnetic separation are referred to fine crushed sands. The grain composition of their followings is given in table. one,

Composition and facilities

Tails I stage wet magnetic separation containing magnetite, wt.%

299.8

four

five

6

Table 1

Fatty acids are waste products of sebacic acid; and consist of a mixture of various acids (stearic, palmitic, oleic, linoleic and other acids of this order) .;

It is a light brown, viscous liquid. It has the following properties: Density, kg / m Acid

number mg / KOH / g Saponification number, mg con / g Not less than 140

No more than 980

Not less than 130

35

Mass fraction of water,%

No more than 20

The composition of the resulting activated mineral powder and its properties are as follows. 2

Table 2

Content, wt.%, In the composition

ziEiiiz ;:

9-9,4

99.0

98.6

Composition and properties

Fatty acids - waste production of sebacic acid 0.2

Porosity,% by volume

Swelling of samples from the mixture

powder with bitumen,% by volume

no more

Indicator bitumen, g

no more

Humidity,% by weight, not more

Hydrophobicity

In the examples, tails of the I stage of wet magnetic separation of magnetite ores with magnetite content of 2.0–6.0 wt.% And fatty acids — waste products of sebacic acid with a density of 976 kg / m, acid number of 139 mg KOH / G, Bitumen BND 130/200

Mineral filler - lime limestone, fractions less than 5.0 mm

Activated mineral powder, corner azan composition

The porosity of the mineral composition,% by volume

Residual porosity,% by volume

Water saturation,% by volume Swelling,% by volume

Continuation of table 2

one

Content, May L, composed

nimzi;

0.2

0

0.05

0

0.6 30

0.04 38

1.0 28

0.02 36

0.002 0.001

0,000

1.4

29

0.03 37. 0.001

Hydrophobic

Sapenia scrap 151 mg KOH / g, with a 15% water mass fraction.

On the obtained activated mineral powder, 4 mixtures of components of the asphalt concrete mixture are prepared, the composition and properties of which are given in Table. 3

Table3

6.3

7.0

1.7 86.0

2.0

2

7.0

21

7.7

81.3

11.0

nineteen

4.2 2.6 2.4 2.5 2.2 1.6 0.5 0.3 0.3. 0.0

8.5

75.5 16.0 21

3.5 2.6 0.4

1248986

Compressive strength 10 Pa, kgf / cm, at a temperature of 20

.50 o

"...

Odds oi

The coefficient of water resistance with long-term water expansion 0.84

Asphalt concrete. the proposed composition have an increased

25

6

Continuation of table 3

0.89

0.96

0.90

crack resistance and water resistance.

Claims (1)

ASPHALT CONCRETE MIXTURE, including bitumen, mineral filler and fatty acid activated mineral powder, characterized in that, in order to increase crack resistance and water resistance of asphalt concrete, it contains 98.6-99.8 wt.% Flotation tailings as a fatty acid activated mineral powder Stage I wet magnetic ore separation with a magnetite content of 26 wt.% And 0.2-1.4 wt.% Waste production of sebacic acid in the following ratio of components, May.%: Bitumen 6.3-8.5 Activated fatty acids mineral powder of the specified composition 2.0-16.0 Mineral filler SU .... 1248986