RU2323909C2 - Road concrete mix - Google Patents

Abstract

FIELD: building.

SUBSTANCE: invention refers to the sphere of building materials, including road building materials, containing natural linking, and can be used during producing of road concrete mix, applicated for generating of automobile roads of I-IV category in the I-IV climatic zones, as well as the airfield pavement and in the office facilities. The road concrete mix has the following ratio, mass %: crushed stone 38-50, bitum 4-6 milled up to the size of 5mm, the soft roof cover contains from 45 till 80% swampy bitum, mineral powder 7-20, and the send is the rest.

EFFECT: it is increased the level of road concrete mix strength and the diminution of the water containing.

2 cl, 2 tbl, 1 dwg

Description

The invention relates to the field of building materials, in particular, building road materials containing an organic binder, and can be used in the preparation of asphalt mixtures used for the coating of roads of I-IV categories in I-IV climatic zones, as well as aerodrome covered and floors in office space.

Known composition (SU, copyright certificate 975754, 1982), containing bitumen, sand and industrial waste - heavy shale fusas, which include shale resin, water and mineral part.

A disadvantage of the known asphalt mixture should be recognized as a low tensile strength while high water saturation.

A composition is also known (SU, copyright certificate 742407, 1980), containing bitumen, sand and caprolactic waste - spent filter powder tripoli.

A disadvantage of the known asphalt mixture should be recognized as a low tensile strength while high water saturation.

The closest analogue of the proposed asphalt mix can be recognized asphalt mix, known from GOST 9128-97 “Mixes of asphalt road, airfield and asphalt” M., MNTKS, 1998, containing crushed stone, bitumen, mineral powder and sand.

A disadvantage of the known asphalt mixture should be recognized as a low tensile strength while high water saturation of asphalt concrete products from this mixture.

The technical problem solved by the proposed compositions of asphalt concrete mixtures is to obtain asphalt concrete based on them with improved physical and mechanical properties.

The technical result obtained by the implementation of asphalt mixtures of the proposed compositions is to increase the tensile strength while reducing the water saturation of asphalt concrete products made from these mixtures.

To obtain the specified technical result, it is proposed to use asphalt mixtures containing (wt.%):

Crushed stone 38-50 Bitumen 4-6 Soft Roof Waste 1.5-3.0 Mineral powder 7-20 Sand rest

moreover, the waste soft roof contains from 75 to 80% viscous bitumen, and the particle size of the crushed waste soft roof is up to 5 mm Usually used waste roofing material, glass isol, hydroisol, mastic.

A feature of the proposed asphalt mixes should be recognized as the introduction of crushed waste soft roof containing in its composition from 75 to 80% viscous bitumen with a particle size of less than 5 mm.

Grinding of soft roof waste to the indicated sizes can be carried out in an electromagnetic grinder of an aluminum bus and a working chamber placed in an inductor. The working chamber can be made of both ferromagnetic materials (sheet steel) and diamagnetic materials (rubber, glass, polymeric material, fiberglass, etc.). In the loading chamber, a hatch is made for the receipt of the crushed material, as well as a hatch for removing the crushed components of asphalt concrete. To hold the magnetic shredders in the chamber volume, use the magnetic field of the inductor and the output grid.

An alternating electromagnetic field creates an electric current passing through the turns of the inductor.

Permanent magnets have south and north poles. The alternating electromagnetic field of the inductor is sinusoidal, pulsating, and since an alternating electric current with a frequency of 35 to 100 Hz is used, the direction of the electric current changes from 35 to 100 times per second, respectively, the current frequency. At the same time, the alternating magnetic field created by the alternating electric field changes. Permanent magnets try to turn around their axis as many times a minute, but since of them in the working chamber from 50 to 90% by volume, then they, colliding with each other, acquire a chaotic Brownian boiling motion, i.e. form a magnetically boiling layer. Each permanent magnet has its own magnetization vector and magnetic torque.

Hot asphalt mixtures are widely used in the construction of coatings on main streets and roads, in inter-quarter driveways, on sidewalks, parking lots and sports grounds.

Coarse-grained and fine-grained asphalt mixtures can equally well be obtained on the basis of wastes from the soft roof.

The advantages of the proposed asphalt mixes with the use of soft roofing waste will be further shown on the model compositions of coarse and fine-grained mixtures, which in terms of particle size distribution satisfy the requirements of GOST 9128-97 for type 1 “B” mixtures (see compositions in table. one).

The results of tests of model compositions of asphalt concrete are shown in table 2.

The advantages of the proposed asphalt mixtures will be further shown on model compositions.

Five model compositions of fine-grained mixtures of the MB-1 type of the proposed compositions were prepared (see Table 1). At the same time, the content of bitumen in the used soft roof waste was 75-80% by weight.

The composition of fine-grained asphalt mixtures type MB-1

Table 1 Applicable Materials Structure No. 1 Number 2 Number 3 Number 4 Number 5 Crushed stone 34.0 38.0 42.0 46.0 52.0 Sand 42.0 36.4 43.0 37.0 20.0 Mineral powder 19.7 19.8 8.9 10.6 21.0 Bitumen 60/0 BND 4.3 4.8 4.6 4.4 4.5 Soft Roof Waste 1.0 1.5 2.0 2.5

Test results of mixtures of MB-1 with roof waste

Table 2 No. p / p Physical and mechanical properties GOST 9128-97 Composition No. 1 Composition No. 2 Composition No. 3 Composition No. 4 Composition No. 5 one The average density of the sample of asphalt g / cm ³ Not normal 2.483 2.491 2.492 2.505 2.51 2 Water saturation% by volume 1.5-4.0 3.9 3.3 2.9 2.6 2.2 3 Strength at compression 20 ° С, not less, MPa 1.5 4.9 5.0 5.2 5.3 1.7 four Tensile strength at compression 50 ° С, not less, MPa 0.8 1.5 1.6 1.7 1.9 1,0 5 Tensile strength at compression 0 ° С, not less than, MPa 3.0 9.9 10.1 10.3 10.8 4.9 6 Water resistance coefficient, not less 0.90 0.99 0.98 0.98 0.98 0.97

The quality assessment of asphalt concrete obtained by introducing into the previously known fine-grained (according to GOST 9128-97) asphalt concrete mixtures of soft roof wastes was carried out in accordance with GOST 12801-98 (test methods).

As can be seen from table 2, as well as from the drawing, the introduction into the composition of the known mixtures of waste soft roofs with a bitumen content of up to 80%, in the amount of 1.0-2.5% by weight, increases the tensile strength of asphalt concrete at 50 ° C at at the same time reducing their water saturation.

Claims (2)

1. Asphalt mixture containing crushed stone, sand, mineral powder and bitumen, characterized in that it additionally contains crushed to a particle size of up to 5 mm soft roof waste containing from 75 to 80% viscous bitumen with the following content of components, wt.%: crushed stone 38-50 bitumen 4-6 soft roof waste 1.5-3.0 mineral powder 7-20 sand rest. 2. The mixture according to claim 1, characterized in that roofing material, glassisol, hydroisol, mastics are used as waste soft roofing.