RU2046771C1 - Method of preparing cold asphalt concrete mixture - Google Patents

Abstract

FIELD: road coatings. SUBSTANCE: cold asphalt concrete mixture is prepared by mixing heated mineral materials with 1.0-1.5% vat residues of ionol production from the rectification stage agidol-80 followed by addition of liquid bitument to the mixture. EFFECT: utilization of manufacture waste. 1 tbl

Description

 The invention relates to road construction and can be used for paving on roads of the second, third and fourth categories.

It is known that cold asphalt concrete is used for roads of the third and fourth categories, which are prepared as follows: crushed crushed stone or gravel in a heated form is fed into the mixer, mineral powder is fed into the mixer there, mixed, then a heated low-viscosity binder is added to the mixture of mineral materials (liquefied bitumen or residual tar) and the mixture is mixed again [1]
However, cold asphalt concrete obtained by this method has low performance properties, especially in terms of water resistance.

The closest to the invention by the technical essence and attainable result is a method of preparing a cold asphalt concrete, stone materials comprising the step of heating to a temperature of 110-120 ^{° C,} mixing them with the modifying mixture composed of bitumen and a petroleum resin at a ratio of 1 to 1 for 1 minute, then a slowly thickening residual bitumen is added to the mixture and the mixture is further stirred for 1.5 minutes. The amount of modifying additive is 2%. This method of producing asphalt concrete provides high water resistance of the mixture even after prolonged water saturation, which allows the use of these mixtures for the construction of roads of the second category.

 However, to prepare the modifying mixture, it is required, in addition to the existing equipment, to install a stirrer and a heated container. In addition, the raw materials of petroleum resin for the preparation of the modifying mixture are limited.

 The aim of the invention is to simplify the method of producing cold asphalt and the expansion of the raw material base of the binder.

 The goal is achieved by the fact that in the method of preparing cold asphalt concrete, including the stage of heating mineral materials, mixing them with a modifying additive, introducing a low-viscosity organic binder and additional mixing of the mixture, the bottoms of ionol production at the rectification stage (Agidol-80) are used as a modifying additive the amount of 1-1.5 wt. on the mineral part.

 It turned out that Agidol-80 allows you to increase the adhesion of the mineral material with an organic binder, thereby improving the performance properties of the mixture.

Agidol-80 is a waste from the production of ionol at the rectification stage and has the following indicators in accordance with TU 38. 302-16-395-92:
Appearance solid product of dark brown color.

Softening point, ^о С not lower than 45.

 Ionol content, not more than 15.

 The content of substituted biophenols, not less than 40.

 Agidol-80 currently does not find qualified use.

As low-viscosity organic binder used medlennogusteyuschy residual liquid bitumen, characterized conditional viscosity at 60 ° ^C with 70-130 corresponding to GOST 11955-82 of the mark IHO bitumen 70/130.

Crushed limestone or granite crushed stone and non-activated mineral powder are used as a mineral filler. The fractional composition of the filler corresponds to a mixture of type G _x according to GOST 9128-84.

 The method is as follows.

Otdozirovanny fractions crushed gravel and mineral powder is heated to 110-120 ^{° C} and then introduced into a 80-Agidol cold, the mixture is stirred for 1 minute. then liquid bitumen is added and the mixture is further mixed for 1.5-2 minutes. The temperature of the resulting mixture is 90-110 ^about C, the prepared mixture is slowly cooled and formed from it samples for testing.

 The results of the preparation of the asphalt mix are shown in the table.

 In this way, five mixtures are prepared.

 The amount of mineral powder in all mixtures is 20%; the rest is crushed stone.

 The amount of agidol and bitumen in excess of 100% of the mineral part is shown in the table.

 As can be seen from the table, the addition of VAT residue for the production of ionol improves the performance properties of the mixture (examples 2-4). When adding Agidol-80 less than 1.0% (example 1), the quality indicators of the samples are even worse than that of the prototype. The introduction of Agidol-80 more than 1.5% (example 5) does not lead to further improvement in the quality of the samples, and the compressive strength even deteriorates.

 The proposed method for the preparation of cold asphalt allows to obtain road surfaces with increased strength, which indicates the acceleration of the formation process and at the same time the coating retains good water resistance.

 In addition, the use of slow-thickening residual bitumen as a binder and still residue of the waste from the production of ionol will expand the raw materials for the manufacture of road materials.

Claims (1)

 METHOD FOR PREPARING COLD ASPHALT CONCRETE MIXTURE by mixing mineral materials with a modifying additive, and then with liquid bitumen, characterized in that as a modifying additive they use the distillation residue of the production of ionol of the rectification stage Agidol-80 in an amount of 1.0-1.5% by weight of mineral parts.

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