SU967987A1 - Asphalt mix - Google Patents

Description

BACKGROUND OF THE INVENTION The invention relates to asphalt concrete mixes and can be used in road construction for pavements and road foundations made from asphalt concrete mixes.

It is known that they are used to make asphalt and tar concrete mixes as a major component of crushed stone, gravel or slag, or a mixture of crushed stone and gravel, and sand, soil or mineral powder 1 as a fine component.

A known road concrete mix, including cement, fine aggregate, water, and crushed cement concrete 2J as a coarse aggregate,

The closest in technical essence and the achieved result to the proposed asphalt concrete mixture is a mixture comprising wt.%:

Oil bitumen 5.5-6.5 Mineral powder 8-20 Aggregate - skeletal portion 73.5-86.5 The disadvantages of the known mixtures are low strength, heat and water resistance, as well as the relatively high cost of the material.

The aim of the invention is to increase heat and water resistance, as well as reduce the cost of the material.

The goal is achieved by the fact that an asphalt concrete mixture, including petroleum bitumen, mineral powder and aggregate, contains as

10 aggregate crushed waste cement concrete fraction of 0.14-10.0 mm in the following ratio, wt.%:

Oil bitumen 5.5-6.5

15

Mineral

powder9,5-18,5

Crushed waste

cement concrete fraction 0.14-10.0 mm 75-85

20

The improvement of the properties of asphalt concrete occurs due to the improved quality of the adhesion of crushed cement concrete to bitumen, due to the high basicity of skeletal

25 parts of cement concrete, specific submicrocrystalline structure of its fracture surface and high surface energy.

In the presence of water in the skeletal

30 parts of cement concrete resist the hydration of cement, accompanied by concentration and the development of a vacuum, which further improves the quality of adhesion.

Asphalt mix was prepared according to the following technology.

The skeletal part (rubble and sand) and the mineral powder were heated to 160 ° C, then the bitumen heated before was added and mixed until a homogeneous mass for 3 minutes.

The quality of crushed waste cement sandy M 150-200 and cement concrete in a sandy-sand mixture M 150-200 fractions of 0.14-10.0 mm was used as a quality aggregate.

The proposed and well-known asphalt-concrete mixes1 were prepared from which they were prepared and tested according to the set goal.

In tab. 1 shows the compositions of the proposed and known mixtures. Table 1

Note. Mixtures 1, 2, 3 of crushed sand cement concrete, mixture 4, 5 of crushed cement; concrete on a gravel-sand mixture.

Asphalt test results. DO concrete presented in Table. 2

Compressive strength of water-saturated samples, MPa

Swelling,% by volume

Coefficient of water resistance

Heat resistance coefficient

Table 2

4.65.6 5.7 3.2

0,170,1 0,2Д

0.90,89 0,81 0,6

1, 1.72.75

Use in . asphalt concrete as a filler of crushed cement concrete waste due to improvement. These properties increase the lifespan of pavements and allow such applications to be used for heavy loads.

This simplifies the technology of preparation of the mixture by eliminating the separate supply and dosing of rubble sand, crushed cement concrete waste is a local material, which helps reduce the cost of asphalt concrete.

Claims (3)

Invention Formula Asphalt concrete mixture, including: mineral oil bitumen, mineral poipomoK and aggregate, because of the fact that, in order to increase heat and water resistance, as well as to reduce the cost of the material, it contains as aggregate crushed waste Cement Concrete Fractions 0.14-10.0 mm with the following ratio of components, wt.%: Oil bitumen 5.5-6.5 M: {neral powder 9, 5-18.5 Crushed cement concrete fraction 0.14-10.0 mm 75-85 Sources of information taken into account during the examination 1. Kreutser GD. Asphalt and peki. M., 1952, p. 278. 2.State pours recycbd pavement Eng. NewsRec., 1980, 204, 23.29, 3. Guidance on the construction of asphalt concrete pavements. ; M., Transport, 1978, p. 15-21 (prototype).