RU2479524C2 - Stabilising additive for peat-based asphalt-concrete mixture (versions) and method of producing structure-forming agent therefor - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to production and application of stabilisers of macadam-mastic asphalt-concrete and asphalt-concrete mixtures for road surfaces. The stabilising additive for macadam-mastic asphalt-concrete mixture contains a natural fibrous structure-forming agent and bitumen. The structure-forming agent used is the medium fibrous humus-bitumen fraction from ground dry peat with particle size of not more than 2.5 mm and an adhesion additive is added, with the following ratio of components, wt %: said ground peat 50…100, adhesion additive 0…50. Also described is a version of the stabilising additive and a method of producing a structure-forming agent from peat.

EFFECT: production of a stabilising additive for macadam-mastic asphalt-concrete and asphalt-concrete mixtures, which provide high characteristic values of the road surface at a low cost and easier production thereof using abundant cheap material.

12 cl, 17 ex, 1 tbl

Description

The group of inventions relates to the production and use of building materials based on bitumen-mineral compositions, in particular to stabilizers for crushed stone mastic asphalt concrete (ASHMA) and asphalt concrete (AB) mixtures for road surfaces, airfields, public and industrial communications and areas.

The difference between mixtures of ACA and AB consists mainly in the fact that ACA, in comparison with AB, contains more bitumen and expensive fillers to increase the degree of filling the voids between the particles of mineral filler and is used for the upper relatively thin part of the roadway, and AB is used to form the lower part roadbed at lower technical and economic requirements.

The top layer of coatings is most susceptible to external influences (when the climatic conditions vary, from solar radiation, the influence of chemical and biological factors) and must, in order to resist them, meet the relevant requirements for strength, moisture, heat and frost resistance and the associated crack resistance, and also on adhesion of the binder to mineral fillers. To do this, use modifying functional additives to bitumen and initial mixtures.

Existing additives for alkaline microorganisms can be divided into two types: 1) polymer and plastic-polymer; 2) fibrous structure formers with organic components (stabilizing additives).

In particular, the first group includes technical solutions for patents: US No. 4829109, Russian Federation No. 2158742, Russian Federation No. 2196750, Russian Federation No. 2148948, Russian Federation No. 21919464. Their disadvantage is the high cost, the increased stickiness of the mixtures of alkali alkali metal oxide or the precipitation of polymer particles from the road surface under loads, and therefore are relatively rarely used.

MiA stabilizers mixtures (the second group of additives) are widely used in practice. For example, a stabilizing additive for crushed stone and mastic asphalt is known (US Pat. RF No. 2273615, IPC: C04B 26/26, C08L 95/00, 20/11/2005). It has a granular form and includes an organic binder and a binder, the organic binder being selected from the group of tar, bitumen or bitumen emulsion, and basement and / or fluff spray, which is a waste of cotton production (CKD), is used as a binder in the following ratio of components composition, wt.%: the specified waste 60 ... 90, organic binders - the rest. Its disadvantage is the low tonnage of CKD waste.

The stabilizing additive for mixtures of alkali-alkali mixtures and the method for its preparation belong to the second group of stabilizers (US Pat. RF No. 2312116, IPC: C08L 95/00, С04В 26/26, 11.24.2006). The additive made in the form of granules includes bitumen and a structure-forming agent, which is a pre-processed flax straw (POLS), with a ratio of POLS: bitumen as (1 ... 3) :( 1 ... 2), respectively. The additive may additionally contain a reagent Neozone D at a ratio of components, wt.%: Stabilizing additive 95 ... 99 and Neozon D - the rest. Neozone D (N-phenylnaphthylamine) is a cationic surfactant that provides adhesion of bitumen to flax fiber. The disadvantage of this additive, which restrains the proper use, is the complex, expensive and environmentally unsafe technology for preparing flax straw, including hardening, mechanochemical treatment in an alkali solution with surfactant additives, washing, drying, crushing, disposal of washing water, etc., which costs are close to the production of cellulose-flax fiber. The fiber bitumen process is also quite expensive, capital intensive in relation to cellulose fiber and almost as much to asbestos. In addition, the used Neozone D refers to strong allergens, which creates additional problems in the production and use of stabilizers.

Also known is the stabilizer of the mixture of alkali mixtures, belonging to the second group and having commercial success, manufactured by J. Reetten meier & Sohne under the brand name Viatop 66 (Smirnov E. Crushed stone mastic asphalt concrete, 2003, No. 1, p.13 - http: / /www.new chemistry.ru). It is adopted as a prototype of the proposed stabilizing additives. The authority of the company served as the basis for the inclusion of Viatop stabilizers, which differ only in the origin of the cellulose fiber, even in regulatory documents for ASHM in the Russian Federation. Viatop 66 stabilizer is a cylindrical granule (2 ... 10 mm) of fine fibrous cellulose (66%), agglomerated with road bitumen (10%). Its disadvantage is the high cost and lack of prerequisites for the stability of asphalt quality during operation.

The objective of the group of the invention is the creation of a stabilizing additive for mixtures of alkali metal alloys and AB, which would provide high performance pavement at low cost and ease of production from affordable cheap raw materials having large volumes of reserves.

To solve the problem with the specified technical result, the stabilizing additive for the alkali mixtures of natural mixtures includes natural fibrous structure former and bitumen. A distinctive feature of the patented stabilizing additive is that a medium-fiber humus-bitumen component of dry crushed peat fraction of not more than 2.5 mm is taken as a structure-forming agent and an adhesive additive is added in the following ratio of components, wt.%: The specified crushed peat 50 ... 100 and adhesive additive 0 ... 50 (Option 1).

Modifications of the stabilizing additive are possible: the medium-fiber component of dry peat with a grain size of not more than 2.5 mm (40 ... 70%) and its dust fraction of not more than 0.02 mm (10 ... 30%) were taken as a builder; in this case, the amide-laminated, ether-substituted or maleated indicated dust fraction can be used, road bitumen up to 20% is additionally introduced, and a cationic or amphoteric surfactant is taken as an adhesive additive.

In order to realize the substance, a method for producing a structure-forming agent from peat is given, characterized in that the initial raw material mixture is made up of equal parts of lowland, upper and transitional peat layers or one of the types of peat with an initial moisture content of up to 50%, large plant residues and foreign objects are removed by sifting on a screen with a sieve passage of fineness 4 ... 5 mm, dry the resulting mass at a temperature of 105 ... 115 ° C to a moisture content of 2 ... 4%, grind it, for example, on a hammer mill to a fineness of not more than 2 5 mm and is separated by a cyclone into two fractions - medium fiber and dust with a particle size of not more than 2.5 mm and 0.02 mm, respectively, then the two fractions are dried to a moisture content below 2%.

For the effectiveness of the implementation of the method, its modifications are given regarding the compositions of substances and modes during the processing of fractions of ground peat.

The 2nd version of the stabilizing additive is given for the possibility of using a mixture in AB. It includes a natural builder and bitumen. Its distinctive feature is that a humus-bituminous dust fraction from dry crushed peat with a particle size of less than 0.02 mm was taken as a structuring agent and an adhesive additive was added, for example, DAD-1 or others, with the following ratio of components, wt.%: Specified crushed peat 50 ... 100% and the specified adhesive additive 0 ... 50%.

As studies have shown, the possibility of using mixtures of the fibrous component and other components of natural peat as a structure-forming agent in the stabilizing additive for alkaline microgravity is due to the fact that the peat fiber is formed and exists in a wide range of natural conditions (including extreme), as a result of which it is resistant to various kinds physico-chemical influences, as well as thanks in large part to the presence in the peat of natural bitumen (up to 15% extracted with benzene), peat wax, humus and humic acids. Despite the high moisture capacity of peat, it is easily dried to almost zero moisture content (due to the hydrophobicity of the fibers and other components, a highly developed evaporation surface in the spatial structure of this material). Dry peat is easy to grind on low-energy grinders, crushed peat is easily mixed with molten bitumen. Due to the brittleness at ordinary temperatures of the humus-bitumen-wax component of dry peat, it is more crushed by crushing and can be partially separated from the fibrous part of the components by fractionation on sieves or cyclones with filters, which makes it possible to control the content of fibers and other components of peat. Thus, it is possible to replace these components (if necessary) with other substances, for example, road bitumen. Humic acids contained in peat and partially oxidized peat bitumen are chemically reactive and can be subjected to various chemical modifications, for example, amination or maleation in order to give them the properties of cationic or amphoteric surfactants that promote the adhesion of bitumen on mineral (acidic) fillers of alkaline alkali metal oxide and AB mixtures. There is the possibility and, in some cases, the feasibility of enhancing the adhesive activity of bitumen to the mineral fillers of alkali-alkali metal alloys and AB mixtures by introducing various adhesive additives, in particular DAD-1 additives or other known additives, for asphalt concrete into stabilizing additives based on peat, which is easily feasible due to the relatively high oil absorption of peat-based stabilizers. All these features have been tested in the development of this group of inventions using methods in accordance with GOST 31015-02 and GOST 12801-98.

The test results of the compositions of alkali-alkali and anti-alcohol mixtures with the proposed stabilizing additives introduced into them are given in the table, which reflects the requirements of GOSTs and gives average values (with an accuracy of ± 5%) of the compositions of the prototype and invention. In the experiment, the mixture SHCHMA-10 was taken as the basic composition, including (by weight): bitumen 6.5%, crushed stone 70%, sand from crushing screenings 18.8%, mineral powder 11.5% with doses of stabilizing additives according to the prototype and according to the invention, 0.4% by weight of the mineral composition. Adhesive activity was evaluated according to GOST 12801-98 at a dose of stabilizing additives of 0.5% by weight of bitumen using Pavlovsky granite as a test material of the mineral part.

The essence of the patented group of inventions is disclosed with the completeness necessary for their implementation in the examples below, in which options (with modifications) of stabilizing additives based on peat are given, a method (with modifications) of obtaining a structure-forming agent, and specific compositions of stabilizing additives for experimental samples of alkaline alkaline amine and AB mixtures.

Example 1. A method of obtaining a structure-forming agent from peat with the possibility of using a mixture in a stabilizing additive for alkaline alkaline microgravity consists in making up a raw material mixture of equal parts of lowland, upper and transitional layers of peat or using one of the types of peat with an initial moisture content of up to 50%, remove large plant residues and foreign objects by sieving on a screen with a sieve passage of 4 ... 5 mm in size, dry the resulting mass at a temperature of 105 ... 114 ° C to a moisture content of 2 ... 4%, grind it, for example, with a hammer shot lke to a particle size of not more than 2.5 mm and separated via a cyclone into two fractions - upland and dust with particle size of respectively less than 2.5 mm and 0.02 mm. If the moisture content of the obtained fractions is 2% and above, carry out drying to a moisture content below 2%. The dust fraction (98% of its output from the bag filter of the cyclone passes through a 0.02 mm sieve) consists of the destroyed interfiber mass of peat humus, bitumen, tar, wax and other organic substances with a relatively low content of fine fibers. The mixing of these two fractions in proportion to their yield during dry grinding (with any similar grinding techniques) is a loose product that preserves all the components of the initial peat mixture, and therefore it can be legitimately defined as dry ground peat with a particle size of no more than 2.5 mm.

On the basis of the latter, a stabilizing additive was created for the alkaline-alkaline mixture, in which the aforementioned ground tof was taken as a builder and an adhesive additive was added in the following ratio of components, wt.%: The specified ground peat 50 ... 100, an adhesive additive 0 ... 50. This supplement is its first option. In the framework of the same option, as a dry ground peat, mixtures of medium-fiber (up to 2.5 mm) and dust (less than 0.02 mm) fractions of ground peat with adhesion additives in the components are used, wt.%: Medium-fiber fraction 40 ... 70, dust fraction 10 ... 30, adhesive additive 0 ... 50. For sample No. 1 of the SchMA mixture, a stabilizing additive was taken containing 100 wt.% Dry ground peat.

Example 2. Modification of the method for producing a structure-forming agent from peat with the possibility of using a mixture in a stabilizing additive for alkaline alkaline microorganisms consists in the amido amination of peat humic acids and oxides of the dust fraction of ground peat with organic amines containing more than two amino groups, in particular polyethylene polyamines (PEPA), the amount of 10% by weight of the specified dust fraction, mix thoroughly, grinding it without heat treatment, taking into account the inevitable activation of the reaction in high temperature urea process for the preparation of alkaline amber and alkaline amine, and mixed with a medium-fiber fraction obtained according to example 1. In this case, a medium-fiber fraction of not more than 2.5 mm and an amide-amined dust fraction with a particle size of less than 0.02 mm were taken as crushed peat in the following ratio of components, wt. %: medium fiber fraction 40 ... 70, amidoaminated dust fraction 10 ... 30 and adhesive additive 0 ... 50.

For sample No. 2 of the SchMA mixture, a stabilizing additive was taken containing 70 wt.% Medium fiber fraction and 30 wt.% Dust fraction treated with PEPA.

Example 3. Modification of the method of obtaining a structure-forming agent from peat consists in the fact that amidamination is carried out by PEPA in an amount of 10% by weight of the dust fraction of ground peat with heating of the obtained composition at a temperature of 130 ... 140 ° C for 4 hours with periodic stirring and process control to change acid number by titration of a portion of an aliquot. The resulting product is mixed with medium fiber fraction, as in example 2, and as a stabilizing additive is used to prepare sample No. 3 of the SchMA mixture.

Example 4. Modification of the method for producing a structure-forming agent from peat consists in the fact that the amination or maleation of peat humic acids and oxides of the dust fraction of ground peat by organic amines, in particular a mixture of mono-, di- and triethanolamines (TEA), or, respectively, maleic anhydride is carried out, in an amount of 10% by weight of the specified dust fraction without heat treatment, mix thoroughly, grinding it, and mix with the medium fiber fraction obtained by the modification of example 2, while the mixture is ready t, using in place of PEPA triethanolamine (TEA) or maleic anhydride.

For sample No. 4 of the SchMA mixture, a stabilizing additive was taken containing 70 wt.% Medium fiber fraction and 30 wt.% Dust fraction treated with TEA.

Example 5. Modification of the method for producing a structure-forming agent from peat consists in the fact that ether amination or maleation is carried out with TEA or, respectively, maleic anhydride in an amount of 10% by weight of the dust fraction of ground peat with heating of the obtained composition at a temperature of 115 ... 120 ° C for 3 hours with periodic stirring and process control to change the acid number by titration of a sample of an aliquot. The reaction products are mixed with a medium fiber fraction, as in example 2, and used as a stabilizing additive for the preparation of sample No. 5 of the SchMA mixture.

Example 6. Modification of the method of obtaining a builder from peat is that road bitumen is added to a mixture of medium fiber and dust fractions up to 20% of their mass, the resulting composition is heated to a temperature of 150 ° C, mixed, cooled and crushed to obtain crumbs. The resulting mixture with a content of 56% medium fiber fraction, 24% dust fraction and 20% road bitumen as a stabilizing additive is used to prepare sample No. 6 of the SchMA mixture.

Example 7. To obtain a structure-forming agent from peat, 56% of the medium-fiber fraction (Example 1), 24% of the dust fraction with PEPA (Example 2) and 20% of road bitumen are mixed, heated (Example 6), mixed, cooled and crushed to crumbs. The latter is used as a stabilizing additive for the preparation of sample No. 7 of the SchMA mixture.

Example 8. To obtain a structure-forming agent from peat, 56% of the medium-fiber fraction (Example 1), 24% of the dust fraction with TEA (Example 4) and 20% of road bitumen are mixed, heated (Example 6), mixed, cooled and crushed to the crumbs that are used as a stabilizing additive, for the preparation of sample No. 8 of the SchMA mixture.

Example 9. A stabilizing additive for use in sample No. 9 of alkali-alkali mixtures is prepared as in example 7, instead of using a simple mixture (example 2), the product of amide amination of the dust fraction (example 3).

Example 10. A stabilizing additive for use in sample No. 10 of alkali-alkali mixtures is prepared as in example 8, instead of using a simple mixture (example 4), the product of etheramination or maleation (according to example 5) is prepared.

Example 11. A modification of the method of producing a builder from peat consists in adding an adhesive additive (amphoteric phosphorus-nitrogen-containing surfactant, for example, DAD-1 additive for asphalt concrete according to STO 22320188-001-2009) in an amount of up to 50 wt.%, mix the mixture when heated 80 ... 90 ° C, grind by friction rolling and sift on a 2.5 mm sieve, the residue on the sieve is returned to regrind, if its share is more than 2%.

The structure-forming agent according to the above method is obtained from 90 wt.% Dry ground peat (according to Example 1) and 10 wt.% Of DAD-1 additive and is used as a stabilizing additive in sample No. 11 of the SchMA mixture.

Example 12. In the sample No. 12 of the SchMA mixture use a stabilizing additive obtained by the method of example 11 on the basis of the structure of 70 wt.% Dry ground peat (as in example 1) and 30 wt.% Additives DAD-1.

Example 13. In the sample No. 13 of the SchMA mixture use a stabilizing additive obtained by the method of example 11 on the basis of the builder of 50 wt.% Dry ground peat (as in example 1) and 50 wt.% Additives DAD-1.

Example 14. In the sample No. 14 of SchMA mixtures, a stabilizing additive is used, obtained according to the method of Example 11 on the basis of a structuring agent from 40 wt.% Dry ground peat (as in Example 1) and 60 wt.% Of DAD-1 additive.

Example 15. In the sample No. 15 of SchMA mixtures, a stabilizing additive is used based on the structure-forming agent processed according to Example 11 from 40 wt.% Dry ground peat (according to Example 1), 30 wt.% Of the product obtained according to the method of Example 7, 20 wt.% Additives DBP-1 and 10 wt.% Road bitumen.

Example 16. In the sample No. 16 of the SchMA mixture, a stabilizing additive is used based on the structure-forming agent processed in accordance with Example 11 from 40 wt.% Dry ground peat (as in Example 1), 30 wt.% Of the product obtained in Example 10, and 10 wt.% Road bitumen.

Example 17. A second variant of a stabilizing additive for an AB mixture is given, including a natural structure former and bitumen, characterized in that a humus bitumen fraction from dry ground peat with a particle size of less than 0.02 mm is taken as a structure former and an additive is added in the following ratio of components, wt.%: the specified ground peat 50 ... 100 and an adhesive additive, for example DAD-1 (0 ... 50%). A stabilizing additive for use in sample No. 17 AB of the mixture is prepared by mixing 70 wt.% Dry crushed peat with a particle size of less than 0.02 mm (dust fraction) with 30 wt.% Additives DAD-1 and processing the resulting composition similarly to the method of example 11.

The bulk products obtained in examples 1-17 can be granulated on a press granulator with a die diameter of 2 to 6 mm to obtain cylindrical granules with a length of 3 to 8 mm.

The proposed group of inventions expands the arsenal of means in the field of stabilizers for alkaline-alkali metal alloys and AB mixtures for road surfaces (both upper and lower parts of the roadbed), because it has good composition characteristics at a low cost of material that exceed (as can be seen from the table) the parameters of the prototype.

Table The average composition of alkali mixtures with stabilizing additives (No. 1 ... 17 samples using the invention correspond to No. of examples in the text) No. p / p The name of indicators Requirement GOST 31015-02 (ЩМА) and GOST 12801-98 (АБ) * Viatop 66 (prototype) one 2 3 four 5 one Runoff of binder, wt.% 0.07-0.15 0.14 0.13 0.13 0.12 0.12 0.12 2 Water saturation, vol.% 1.0-4.0 2.2 2,5 2,3 2,4 2,5 2.2 3 Water resistance during prolonged water saturation, rel. 0.85 no less 0.95 0.98 0.98 0.98 1,2 0.99 four Strength under compression (20 ° С), MPa 2.2 not less 4.9 4.8 5,0 5,0 5.1 5.1 5 The limit of compressive strength (50 ° C), MPa 0.65 no less 1,5 1.4 1,5 1,6 1,5 1,6 6 Coefficient of internal friction, rel. 0.93 no less 0.93 0.95 1,0 1,2 1,1 1.3 7 Shear adhesion (50 ° C), MPa 0.15 not less 0.27 0.27 0.3 0.32 0.3 0.32 8 Crack resistance (breaking strength (0 ° С)), MPa 2.5-6.0 3.3 3.2 3.6 3.8 3.4 3.6 9 Adhesion of bitumen to granite (adhesion of the binder to the mineral part of the mixture),% 50 * not less 55 55 80 85 80 80

Table continuation No. p / p 6 7 8 9 10 eleven 12 13 fourteen fifteen 16 17 one 0.13 0.10 0.10 0.10 0.11 0.13 0.13 0.14 0.15 0.13 0.12 0.14 2 2.2 2,5 2,4 2,3 2.2 2,3 2.2 2.2 3.8 2,3 2,4 2,3 3 0.95 1.3 1,2 1,1 1.3 1,2 0.99 0.95 0.87 0.97 1.4 0.98 four 5.2 5,4 5.3 5,4 5,4 5.3 5.1 4.9 4.0 4.9 5.5 5.2 5 1,5 1,6 1,6 1,5 1.7 1,6 1,6 1,5 0.65 1.7 1.8 1,6 6 0.94 1.3 1,2 1.3 1.4 1.3 1,2 0.94 1,1 1,2 1,5 1.3 7 0.28 0.33 0.35 0.35 0.37 0.36 0.32 0.27 0.2 0.28 0.37 0.3 8 3.4 3.6 3.3 3,7 3,5 3.6 3.4 3.3 3.3 3.4 3,7 3.4 9 65 80 85 80 80 85 88 88 90 75 70 90

Claims (12)

1. A stabilizing additive for crushed stone and mastic asphalt mix, including natural fibrous structure-forming agent and bitumen, characterized in that the medium-fibrous humus-bitumen fraction from dry crushed peat with a grain size of not more than 2.5 mm is taken as a structure-forming agent and an adhesive additive is added in the following ratio .%:
Specified Ground Peat 50-100 Adhesive additive 0-50 2. The stabilizing additive according to claim 1, characterized in that as a ground peat, its medium-fiber fraction with a particle size of not more than 2.5 mm and its dust fraction with a particle size of less than 0.02 mm are taken in the following ratio of components, wt.%:
Medium fiber fraction 40-70 Dust fraction 10-30 Adhesive additive 0-50 3. The stabilizing additive according to claim 2, characterized in that the dust fraction of crushed peat is amidoaminated, or ether-aminated, or maleated. 4. The stabilizing additive according to claim 3, characterized in that it further comprises road bitumen up to 20 wt.%. 5. The stabilizing additive according to claim 1, characterized in that the amphoteric phosphorus-nitrogen-containing surfactant is taken as an adhesive additive, for example, the additive DAD-1 used for asphalt concrete. 6. A method of producing a structure-forming agent from peat, characterized in that the initial raw material mixture is made up of equal parts of lowland, upper and transitional layers of peat or one of the types of peat with an initial moisture content of up to 50%, large plant residues and foreign objects are removed by sieving on rumble with a sieve passage of fineness 4 ... 5 mm, dry the resulting mass at a temperature of 105 ... 115 ° C to a moisture content of 2 ... 4%, grind it, for example, with a hammer mill, to a fineness of no more than 2.5 mm and separate using a cyclone on dv e fractions - medium fiber and dust with a particle size of not more than 2.5 mm and 0.02 mm, respectively, then the two fractions are dried to a moisture content below 2%. 7. The method according to claim 6, characterized in that the amidoamination, etheroamination or maleation of peat humic acids and oxides of the pulverized peat fraction of the ground peptides with organic amines containing more than two amino groups is carried out; carried out directly in the manufacture of the additive or in the conditions of hot preparation of alkali mixtures or AB mixtures. 8. The method according to claim 7, characterized in that the amination is carried out with polyethylene polyamines in an amount of 10% by weight of the pulverulent fraction of ground peat with heating of the obtained composition at a temperature of 130 ... 140 ° C for 4 hours with periodic stirring and control the process by changing the acid number titration of a sample of an aliquot. 9. The method according to claim 7, characterized in that the etheroamine or maleination is carried out with a mixture of mono-, di- and triethanolamines or maleic anhydride in the amount of 10% by weight of the pulverulent fraction of ground peat with heating of the resulting composition at a temperature of 115 ... 120 ° C in for 3 hours with periodic stirring and control the process by changing the acid number by titration of a portion of an aliquot. 10. The method according to claim 6, characterized in that road bitumen is added to a mixture of medium fiber and dust fractions of ground peat to 20 wt.%, The resulting composition is heated to 150 ° C, mixed, cooled and crushed to obtain crumbs. 11. The method according to claim 6, characterized in that a nitrogen-containing surfactant is added to the mixture of fractions from ground peat, for example, DAD-1 additive up to 50 wt.%, Stirred at heating 80 ... 90 ° C, crushed by friction rolling and sieved on sieve 2 , 5 mm, the residue on the sieve is returned to regrind, if its share is more than 2%. 12. A stabilizing additive for an asphalt mix, including a natural structure-forming agent and bitumen, characterized in that a humus-bitumen fraction from dry ground peat with a particle size of less than 0.02 mm is taken as a forming agent and an adhesive additive is added in the following ratio of components, wt.%: The specified ground peat 50 ... 100%, adhesive additive 0 ... 50%.