SU1528760A1 - Asphalt-concrete mix - Google Patents

Abstract

The invention relates to road building materials and can be used to pave roads, bridges, squares and sidewalks of pedestrian paths. The purpose of the invention is to increase the frost resistance of asphalt concrete. Asphalt mixture contains 6.5 - 7.0 wt.% Of the oxidized mixture of tall pitch with divinyl styrene thermoplastic elastomer in an amount of 1 - 2% by weight of tall pitch, 3 - 5 wt.% Mineral powder, 5 - 7 wt.% Pigment and the rest is mineral aggregate. Frost resistance coefficient after 50 cycles 0.95 - 0.97. 3 tab.

Description

The invention relates to road construction materials and can be used for paving roads, bridges, squares and sidewalks of pedestrian paths.

The purpose of the invention is to demonstrate the frost resistance of asphalt concrete.

The invention is carried out as follows.

Tall pitch is mixed with divinyl washing thermoplastoplastic (DST) and oxidized at 180-240 ° C.

The resulting substance is mixed with mineral components in accordance with the standard technology for the preparation of asphalt-concrete mixtures.

The components used to prepare the asphalt mix have the following characteristics.

Mineral powder - activated, responsible GOST 16557-78.

Tall Peck TU 81-05-84-80; tall pitch of hardwood, grade B, acid number 55 mg KOH per 1 g of the product; softening temperature S0 s.

Tall pitch is formed by processing tall tallow oil into rosin and fatty acids.

Most of the tall oil pitch is represented by products of rectification of hydroxyl-containing compounds of tall oil (stearins, phenols, alcohols, resin alcohols), resinous and fatty acids.

I

Resin and fatty acids contain - up to 30% in tall pitch. Fatty acids and non-saturated: oleic (C, H, COOH), linoleic (SpNe | COOH), linolenic (Cj H jCOOH), and others. Resin acids (tall rosin) ow 1C (X

are a mixture of acid isomers, the general formula of which is C oHjo i Dye - scarlet pigment (GOST 8567-73).

Mineral material - crushed stone from natural stone, obtained by crushing rocks (GOST 8267-82).

det - divinel styrene thermoelastoplast - a block copolymer of divinyl and styrene with a bound sgirol content of 38-32%. Children are characterized by high strength at elevated temperatures (up to) and low brittleness temperatures (about -80 ° C). In this range, the parts are in a highly elastic state, the details meet the requirements of VTU 38-3 No. 300-67.

Examples and properties of the recipient are given in table. one.

In tab. 2 shows examples of mixture blending (the number of the composition of the slurry corresponds to the number of the mixture), in table 3 the properties of the asphalt concrete obtained.

As can be seen from the above data, the asphalt concrete of the proposed composition has increased frost resistance.

Claims (1)

Invention Formula Asphalt concrete mixture, which is injected into tall tare-based pitch, mineral powder, pigment and mineral aggregate, is due to the fact that, in order to improve the frost resistance of asphalt concrete, it has a mixture of tall cotton cake with divinyl styrene thermoplastic elastomer in an amount of 1-2% of the mass of tall oil pitch in the following ratio, May. %: Reported6,5-7,0 Mineral powder .3.0-5.0 Pigment5-7 Mineral aggregate Rest - 70 35 55 More than 100 29 -21 220 69 38 56 More than 100 30 -22 220 72 36 54 More than 100 28 -20 220 Stand on the control sample 0.1 0.1 0.1 Table 1 69 38 72 36 56 more than 100 30 -22 220 54 More than 100 28 -20 220 0.1 0.1 Component content, May, 7, by examples : z: j ::: i :: ::: i: 6.56.87.0 5, 04.03.0 5.0 6.07.0 83, 5 83.2 83 Table 3 Asphalt by examples 1 Prototype Strength at compression, MPa, at ° C 20 50 ABOUT Strength at compression, MPa, after 50 cycles freezing Coefficient frost resistance after 50 ijjiKlov Colour Water saturation,% Swelling,% Table 7, 5.3 8.8 6.80 4.91 7.2 7.1 5.83 0.96 1.7 0.1 0.86