RU2305726C1 - Protective road pavement coating forming method - Google Patents

Abstract

FIELD: road building, particularly methods or arrangements for preventing slipperiness or protecting against influences of the weather.

SUBSTANCE: method involves providing double surface treatment, including treating ballast with bitumen, dispersing treated ballast in two layers over road and compacting thereof along with bitumen pouring over each ballast layer. Ballast made of main rock or slag ballast is used. Before ballast treatment with bitumen limestone or slag screenings in amount of 30-40% of ballast mass are added to the ballast. The obtained bitumen-mineral mix is dispersed in hot state and compacted.

EFFECT: improved quality and service life of pavement coating and simplified protective coating forming technology.

1 cl, 4 ex, 2 tbl

Description

The invention relates to the field of road construction, and in particular to the device of protective layers of road surfaces.

A known method of the device of protective layers, including obtaining an asphalt mixture in an asphalt mixing plant, its distribution by an asphalt paver and compaction (SNiP 3.06.03-85 Roads). The requirements for compacted asphalt mixes - asphalt concrete - are made according to physicomechanical indicators (GOST 9128-97 "Mixes of asphalt concrete road, airfield and asphalt concrete. Technical conditions").

The disadvantages of the method are the need for the introduction of mineral powder and stringent requirements for the particle size distribution of asphalt mixtures.

Closest to the proposed one is a method for arranging protective layers by means of a double surface treatment device, including treating crushed stone with bitumen (producing black crushed stone) in an asphalt mixing plant, distributing crushed stone with a crushed stone paver onto bitumen previously poured over the surface of the road surface, compaction of crushed stone with crushed stone by rollers, pouring onto a compacted layer bitumen, distribution of the second layer of crushed stone treated with bitumen, compaction of crushed stone and final pouring of bitumen over the surface of the treated nnogo bitumen macadam (BCH 38-90 Technical notes for pavements device with a rough surface -. M .: Real -. 1990. - s.22-24).

The disadvantage of this method is the low physical and mechanical properties of the obtained material in the protective layer (Table 1), the short service life of the protective layer, including due to the use of acidic rocks (granites, for example), which have poor adhesion, as crushed stone with bitumen, which leads to peeling of the bitumen film and the destruction of the protective layer (Road-building materials: Textbook for high schools / I.M. Grushko, I.V. Korolev and others. - M .: Transport.- 1991 - P.217- 218, 231-232). The disadvantages of this method also include a large number of work operations and the high complexity of the technological process, the long period of formation of the protective layer, because after the surface treatment device, movement is regulated with the goal of its final formation within 10 days (VSN 38-90, p. 24).

The problem to which the invention is directed, is to improve the quality and durability of the protective layer and simplify the technology of its device.

This object is achieved in that in the method of installing a protective layer of pavement by means of a double surface treatment device, including treating crushed stone with bitumen, distributing and compacting the treated crushed stone in two layers with pouring bitumen on top of each layer, unlike the prototype, crushed stone from the main rocks is used or slag, and before processing the crushed stone with bitumen, limestone or slag screenings are introduced into the crushed stone in an amount of 30-40% of the crushed stone mass, all bitumen is fed to the mineral material with stirring in altosmesitelnoy installation, resulting bituminous mixture was partitioned while hot compacted.

The method is as follows.

For the preparation of black gravel and bitumen-mineral mixtures, limestone crushed stone was used. 5-10 mm with a grade of strength M1200 of Ruda OJSC (Rostov Region) and a screening of 0-5 mm from the same material; granite crushed stone M1200 fr. 5-10 mm Klesovsky quarry (Ukraine) and granite screening 0-5 mm OAO Pavlovskgranit (Voronezh region). For the preparation of black crushed stone and bitumen-mineral mixtures, granite crushed stone was also used. 5-15 mm Klesovsky quarry (Ukraine), gabbro-diabase crushed stone M1200 fr. 5-15 mm LLC “Prionezhsky quarry” (Republic of Karelia), slag screening fr. 0-10 mm and slag crushed stone M1200 fr. 10-20 mm OAO Novolipetsk Metallurgical Plant. Bitumen was used grade BND 60/90 Ryazan Oil Refinery. Bitumen consumption was calculated by the bitumen intensity of mineral components (Road-building materials: Textbook for high schools / I.M. Grushko, I.V. Korolev et al. - M .: Transport.- 1991. - p. 253-255) to obtain a compacted bitumen-mineral material with a water saturation of 5-8%. Quality indicators of bitumen-mineral mixtures were determined in accordance with GOST 12801-98 “Materials based on organic binders for road and airfield construction. Test Methods. "

Example 1. The preparation of black gravel and a double surface treatment device on granite and limestone was carried out according to the composition: gravel 5-10 mm - 96.2%, bitumen - 3.8%. When preparing black gravel in an asphalt mixing plant at a temperature of 140 ° C, bitumen consumption was 1.5%. The rest of the bitumen was used for bottling with a surface treatment device. The prepared black gravel was distributed by the gravel paver onto the primed pavement and compacted. After pouring bitumen, a second layer of crushed stone was distributed, the second bitumen was compacted and produced. Then, cuttings were made from a double layer of surface treatment, which were heated in the laboratory to 140 ° C, mixed to a homogeneous mass, and the samples were molded. The test results of crushed stone on granite and limestone are presented in table 1.

Example 2. The preparation of the bitumen-mineral mixture on granite and limestone was carried out according to the composition: crushed stone - 5-10 mm - 60%, sifting - 35.2%, bitumen - 4.8%. The preparation of the bitumen-mineral mixture was carried out in an asphalt mixing plant at a temperature of 140 ° C. The prepared bitumen-mineral mixture was transported to the place of laying and laid asphalt paver on a paved road paved with bitumen at a temperature of 120-140 ° C. Compaction of the mixture was carried out by rollers until a compaction factor of 0.98 was obtained. Cuttings were made from the compacted layer of bitumen-mineral material, which were reshaped in the laboratory at a temperature of 140 ° C. The test results of the bitumen-mineral mixture on granite and limestone are presented in table 1.

As a result of the analysis of the data in table 1, we can draw the following conclusions. The introduction of limestone screenings in the amount of 35.2% into limestone crushed stone allowed to reduce the porosity of the mineral core by 17.9%, residual porosity by 39.9%, water saturation by 39.8%, increase strength at 20 ° C by 68.8%, at 50 ° C 3 times, increase water resistance by 12%, water resistance with prolonged water saturation by 25%. The use of limestone in the bitumen-mineral mixture instead of the granite stone material increased the water resistance of the bitumen-mineral mixture by 11%, and the water resistance during prolonged water saturation by 25%.

Example 3. Preparation of black gravel and surface treatment device on granite gravel FR. 5-15 mm, slag fr. 10-20 mm and gabbro-diabase fr. 5-15 mm was produced according to the composition: crushed stone - 96.6%, bitumen - 3.4%. The technology for the preparation of black gravel, surface treatment devices, the method for preparing samples are similar to those shown in example 1. The test results of the samples are shown in table 2.

Example 4. Preparation of a bitumen-mineral mixture on granite crushed stone fr. 5-15 mm and granite screenings, as well as gabbro-diabase crushed stone fr. 5-15 mm and limestone screenings were made according to the composition: crushed stone from 5-15 mm - 56.9%, screening - 3.8%, bitumen - 5.1%. Preparation of a bitumen-mineral mixture on slag crushed stone fr. 10-20 mm and slag screenings were made according to the composition: crushed stone - 54.2%, screening - 40%, bitumen - 5.8%. The technology for preparing the bitumen-mineral mixture and the device of the protective layer, the method for preparing the samples are similar to those shown in example 2. The test results of the samples are shown in table 2.

As a result of the analysis of the data in table 2, we can draw the following conclusions. The introduction of limestone screening with bitumen into gabbro-diabase gravel allowed to reduce the porosity of the mineral core by 18.6%, residual porosity by 45%, water saturation by 40.3%, and strength by 63.3% compared to black gravel on granite; increase the strength at 20 ° C by 63 %, at 50 ° C by 5 times, increase water resistance by 26%, water resistance during prolonged water saturation by four times. The introduction of slag screenings with bitumen treatment into slag crushed stone reduced the porosity of the mineral core by 19.9% compared to black crushed stone on granite, residual porosity by 41.1%, water saturation by 31.7%, and increased strength at 84 ° C by 84 , 3%, at 50 ° С - 6.5 times, increase water resistance by 35%, water resistance during prolonged water saturation by 5.25 times.

This method allows to improve physical and mechanical properties, increase the service life of the protective layer and simplify the technology of its device.

Table 1 Indicators of the physico-mechanical properties of crushed stone and bitumen-mineral mixtures No. p / p The name of indicators The value of indicators of physical and mechanical properties for black crushed stone bitumen-mineral mixture on granite on limestone on granite on limestone one 2 3 four 5 6 one The porosity of the mineral skeleton,% by volume 22.8 22.9 18.6 18.8 2 Residual porosity,% by volume 14.6 14.8 8.7 8.9 3 Water saturation,% by volume 12.5 12.6 7.9 7.7 four Strength under compression, MPa: at 20 ° C 1.7 1,6 2,8 2.7 at 50 ° C 0.2 0.2 0.7 0.6 5 Water resistance 0.8 0.9 0.91 1.01 6 Water resistance with prolonged water saturation 0.2 0.6 0.45 0.75

table 2 Indicators of the physico-mechanical properties of crushed stone and bitumen-mineral mixtures No. p / p The name of indicators The value of indicators of physical and mechanical properties for black crushed stone bitumen-mineral mixture on granite on slag on gabbro diabase on granite and granite screenings on slag and slag screenings on gabbro-diabase and limestone screenings one 2 3 four 5 6 7 8 one The porosity of the mineral skeleton,% by volume 23.6 24.1 23,4 19.9 19.1 19.2 2 Residual porosity,% by volume 16.8 17.4 16.7 9.1 9.9 9.2 3 Water saturation,% by volume 13.9 14.6 13.5 8.2 9.5 8.3 four Strength under compression, MPa: at 20 ° C 1.9 1.4 1.8 2.9 3,5 3,1 at 50 ° C 0.2 0.15 0.2 0.9 1.3 1,0 5 Water resistance 0.8 0.9 0.9 0.92 1,08 1.01 6 Water resistance with prolonged water saturation 0.2 0.8 0.6 0.5 1.05 0.80

Claims (1)

A method of arranging a protective pavement layer by means of a double surface treatment device, including treating crushed stone with bitumen, distributing and compacting the treated crushed stone in two layers with pouring bitumen on top of each layer, characterized in that crushed stone from main rocks or slag is used, and before crushed stone processing 30-40% of the mass of crushed stone is injected with bitumen into the crushed stone, limestone or slag screenings, the resulting bitumen-mineral mixture is distributed in a hot state and compacted.