RU1825763C - Method of asphalt concrete mixture preparing - Google Patents

Abstract

Usage: road construction. SUMMARY OF THE INVENTION: Stone materials are treated with an aqueous solution of ferric chloride, heated and mixed with a bitumen-containing component, into which the oxidation product of styrene resin is introduced in an amount of 0.2-3.0% by weight of bitumen in a bitumen-containing component. The compressive strength of asphalt concrete at 20 ° C is 6.2-7.0 MPa. also after water saturation 5.9 - 6.4 MPa, swelling 0.01 - 0.02%, water resistance coefficient 0.96-1.0. 2 tab.

Description

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The invention relates to the field of manufacturing composite materials based on bituminous ingredients and can be implemented in road construction.

The purpose of this invention is to increase the strength of asphalt concrete.

The goal is achieved in that in a method for preparing an asphalt mixture by mixing a bitumen-containing component with a surface-active additive and heating it, followed by mixing it with heated stone material, previously treated with an aqueous solution of ferric chloride, the styrene resin oxidation product is used as a surfactant in the amount of 0.2-3.0% by weight of bitumen in the bitumen-containing component.

A method for preparing an asphalt mixture can be described by the following examples. Example 1. (Preparation of the target product, a styrene resin oxidation product).

500 g of cubic residue of styrene production (approximate composition: acetophenone 30-35%, styrene 10-12%, benealdehyde 1.5-2.0%, resin 45-50%, inhibitor 1.5-2.0%. Methylphenylketone 4.0-4.5 %) subjected to vacuum distillation in a three-necked flask in a laboratory setup equipped with a water-jet vacuum pump, with a residual pressure of 35-40 mm RT.article and temperature 240-250 ° С. The result is: distillate 230 g (46.0%), styrene resin 260.0 g (52.0%). the loss is 10.0 g (2.0%). To the obtained amount of styrene resin in the same three-necked flask was added an 0.1 g gallium oxide trichloride catalyst and, by supplying air to the flask by means of a water-jet pump (air supply rate of 6 l / h), it was oxidized for 15 -20 hours at a temperature of 240-250 ° C. Oxidized sti00

ju e vi about s

pu / iMic ti t h nj is a pre-nupd./po A) c solid of brown cinnamon, which softens at 93 ° C. G Msiepai, RA according to the ring-ball method (GOST 11500-73) is 125 ° C. In terms of chemical composition, resin is a complex mixture of higher aliphatic, alicyclic and polycyclic carbohydrates t and their derivatives - carboxylic acids, and n / idehydop, which practically doesn’t have any relation to fractions,

 h 1 (syn oxidized stypr 1mch f1 MI 260 g styrene resin. When

-; PM h. Experiment obtained black co | i m g (70%), oxidized styrene

m nor, g (92 5%), loss of 1.3 g (0.5%).

i (1 2. G pum-containing raw materials I i h, HI to liquefaction temperatures (1 jU hv L) and introduced into an already liquefied stretch1) tn4Jr jt r oxidation of styrene resin in the amount of 0,% of the total mass of bitumen in bitumen-containing raw materials This mixture they sizzle R for 3 5 minutes and mix p (and, i. with exchangeable material, previously aged in a 0.3% solution of 1 ferric chloride for 5 minutes. I use the complete composite material for the manufacture of road

M i

((h i / in this way as-. f of a different mixture and its operational- | - origins are presented in Table 1

mm p 1) as described in bitumen content i 1 oxidation product

(. l and the amount of 1.0% by weight) iyr-containing raw materials

r and p A Perform as in the example

 and no raw materials are introduced

II iro / n m / (About CF

o-b, ma in bigum-containing

; .p 5. Carried out as in

,. j and (lpum-containing raw materials

i of styrene cmo4 and j of the bitumen mass in

 rye

/ b

i

..

Example 6 (comparative). The procedure is carried out as in Example 2, but the styrene resin oxidation product is introduced into the bitumen-containing raw material in an amount of 0.1% by weight of bitumen in the bitumen-containing raw material.

Example 7 (comparative). Example 2 was carried out, but with the introduction of a styrene resin oxidation product of May 6.0% into the bitumen-containing feedstock.

Example 8 (similar to 1). It is carried out according to the general scheme of Example 2, but iron (III) stearate is introduced into the bitumen-containing raw materials in an amount of 3.0% by weight of bitumen in the bitumen-containing raw materials, and the stone material is pre-treated with a 1.0% solution of hydrated lime.

Example 9 (prototype 2). It is carried out according to the general scheme of Example 2, but the product of oxidation of the polyalkylbenzene resin in the amount of 1.0% by weight of bitumen in the bitumen-containing raw material is introduced into the bitumen-containing feedstock.

The composition of the operational characteristics obtained in examples 2-9 of asphalt mixtures are presented in table. 1 and 2.

As can be seen from the data in Table 2, the use of the described method makes it possible to obtain an asphalt concrete mixture with a practically zero swellability level. and at the same time with high strength.

Claims (1)

The claims A method of preparing an asphalt-concrete mixture by mixing a bitumen-containing component with a surface-active additive and heating it, followed by mixing with heated stone material, previously treated with an aqueous solution of ferric chloride, characterized in that what. in order to increase the strength of asphalt concrete, a styrene resin oxidation product in the amount of 0.2 - 3.0% by weight of bitumen in the bitumen-containing component is used as a surface-active additive. Table 1 Table 2