CN111334057A - Special asphalt for treating asphalt surface by layer-paving method and preparation method thereof - Google Patents

Abstract

The application relates to special asphalt for treating asphalt surface by a layer-paving method and a preparation method thereof. The invention discloses a special asphalt for treating the asphalt surface by a layer paving method, which can ensure road performance and meet the requirements of layer paving construction by conforming indexes such as penetration, softening point, ductility, thixotropic temperature and the like to standards, and comprises the following components in percentage by mass: 85-90 parts of asphalt, 10-13 parts of modifier, 0.5-1 part of cross-linking agent and 1-2 parts of carbon black; the asphalt is No. 70 road petroleum asphalt, No. 90 road petroleum asphalt or No. 100 road petroleum asphalt; the modifier is prepared from swelling oil and a styrene-butadiene-styrene block copolymer according to a mass ratio of 5-7: 3-5; the crosslinking agent is prepared from precipitated sulfur and an accelerator according to a mass ratio of 3-5: 5 to 7.

Description

Special asphalt for treating asphalt surface by layer-paving method and preparation method thereof

Technical Field

The invention relates to asphalt and a preparation method thereof, in particular to special asphalt for treating the surface of asphalt by a layer paving method, which can ensure road performance and meet the requirements of layer paving construction by conforming indexes such as penetration, softening point, ductility, rotary viscosity, thixotropic temperature and the like to standards.

Background

The asphalt surface treatment is implemented by using asphalt and aggregate according to a layer-by-layer paving or mixing method, and its thickness is less than 3cm, and it is mainly used for protecting non-asphalt bearing layer and resisting wear. The surface treatment of the asphalt by the layer-paving method is suitable for the surface layer of a three-level road and a four-level road, and is a novel pavement repairing technology which is started in recent years, the asphalt can be divided into a single layer, a double layer and three layers according to different times of pouring asphalt and spreading aggregate, the thickness of the single layer is 10-15 mm, the thickness of the double layer is 15-25 mm, and the thickness of the three layers is 25-30 mm. Because the surface of the asphalt is treated to be thin and basically treated by the warm-mixing technique, additives for reducing viscosity, such as montan wax, sasobi wax, polyolefin wax and Fischer-Tropsch wax, organic acids such as stearic acid and surfactants such as fatty alcohol amide, are often added to the asphalt at present. The low cohesion of the additives used tends to reduce the road-making properties at the surface of the asphalt by means of layer-laying. Therefore, in order to ensure road performance, rapid construction (completed before asphalt is coagulated) is partially adopted, but the single-layer thickness is at least 20mm, and the labor intensity and the manufacturing cost are high.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art and provides the special asphalt for treating the surface of the asphalt by the layer paving method and the preparation method thereof, wherein the indexes such as penetration, softening point, ductility, rotary viscosity, thixotropic temperature and the like all meet the standard, so that the pavement performance can be ensured and the requirement of layer paving construction can be met.

The technical solution of the invention is as follows: the special asphalt for treating the asphalt surface by a layer-paving method is characterized by comprising the following components in percentage by mass: 85-90 parts of asphalt, 10-13 parts of modifier, 0.5-1 part of cross-linking agent and 1-2 parts of carbon black; the asphalt is No. 70 road petroleum asphalt, No. 90 road petroleum asphalt or No. 100 road petroleum asphalt; the modifier is prepared from swelling oil and a styrene-butadiene-styrene block copolymer according to a mass ratio of 5-7: 3-5; the crosslinking agent is prepared from precipitated sulfur and an accelerator according to a mass ratio of 3-5: 5 to 7.

The swelling oil is heavy aromatic rubber oil, naphthenic oil, furfural extract oil or light filling oil; the styrene-butadiene-styrene block copolymer is SBSYH791, SBSYH792, SBS101 or SBS 4303; the accelerator is zinc oxide, magnesium oxide, lead oxide, a phenolic vulcanization accelerator H, a guanidine vulcanization accelerator D or thiuram; the carbon black is reinforcing carbon black or wear-resistant carbon black.

A preparation method of the special asphalt for treating the asphalt surface by the layer-paving method sequentially comprises the following steps:

a. uniformly stirring swelling oil, a styrene-butadiene-styrene block copolymer modifier and carbon black at 120-160 ℃ to prepare a mixture;

b. and (3) uniformly stirring the mixture and the asphalt at the temperature of 100-130 ℃, adding the precipitated sulfur and the accelerator, and continuously stirring and reacting for 30 minutes at the temperature of 100-130 ℃.

According to the invention, the styrene-butadiene-styrene block copolymer which belongs to a non-polar substance and the swelling oil are dissolved, so that the micromolecule swelling oil is filled between styrene-butadiene-styrene block copolymer molecules, the strength of molecular bond crosslinking of the styrene-butadiene-styrene block copolymer is increased, preparation is provided for the next low crosslinking density reaction, and meanwhile, the swelling oil with low viscosity can reduce the penetration degree and the thixotropic temperature of the asphalt. The indexes of penetration, softening point, ductility, rotational viscosity, thixotropic temperature and the like of the invention all meet the standard, thus ensuring road performance and meeting the requirements of layer paving construction and overcoming the problems of high labor intensity and high manufacturing cost in rapid construction.

Detailed Description

Example 1:

a. stirring 68 parts by weight of aromatic rubber oil, 38 parts by weight of SBSYH792 (styrene-butadiene-styrene block copolymer) and 2 parts by weight of wear-resistant carbon black uniformly at 130 ℃ to prepare a mixture;

b. and uniformly stirring the mixture and 880 parts by mass of No. 90 road petroleum asphalt at 110 ℃, adding 0.3 part by mass of precipitated sulfur and 0.7 part by mass of thiuram, and continuously stirring and reacting for 30 minutes.

Example 2:

a. 60 parts by mass of naphthenic oil, 49 parts by mass of SBSYH791 (styrene-butadiene-styrene block copolymer) and 1 part by mass of reinforcing carbon black are uniformly stirred at 120 ℃ to prepare a mixture;

b. and uniformly stirring the mixture and 900 parts by mass of No. 100 road petroleum asphalt at 100 ℃, adding 0.25 part by mass of precipitated sulfur and 0.25 part by mass of zinc oxide, and continuously stirring and reacting for 30 minutes at 105 ℃.

Example 3:

a. uniformly stirring 50 parts by mass of furfural extract oil, 50 parts by mass of SBS101 (styrene-butadiene-styrene block copolymer) and 1 part by mass of reinforcing carbon black at 150 ℃ to prepare a mixture;

b. and uniformly stirring the mixture and 850 parts by mass of No. 70 road petroleum asphalt at 130 ℃, adding 0.3 part by mass of precipitated sulfur and 0.3 part by mass of phenolic vulcanization accelerator H, and continuously stirring and reacting for 30 minutes at 115 ℃.

The results of experiments with modified asphalt and coarse aggregate prepared according to examples 1, 2, 3 of the present invention were as follows:

1. example 1 basic test indexes of modified asphalt are shown in Table 1

TABLE 1

2. Anti-peeling test

In the embodiments 1, 2 and 3 of the present invention, samples 1, 2 and 3 are respectively obtained, and according to the experiment of the surface adhesion between T0654-2011 asphalt and coarse aggregate in JTG E20-2011 of road engineering asphalt and asphalt mixture test specification, samples 1, 2 and 3 all meet the standard requirements.

3. Mixture gradation test

In the embodiments 1, 2 and 3 of the invention, OGFC-10 type mixture grading design is adopted, and screening results are shown in Table 2 according to the grading design requirements of the mixtures of the drainage type wearing layer of road asphalt pavement construction technical Specification JTG F40-2004 grading.

TABLE 2

Mesh opening mm	13.2	9.5	4.75	2.36	1.18	0.6	0.3	0.075
									The required passing percentage%	100	90-100	50-70	10-22	6-18	4-15	3-12	2-6
Actual measured passing percentage%	100	94.3	62.5	13.5	7.5	8.8	5.3	3.3

4. Test of mixture Properties

The test is carried out according to JTGE20-2011< T0702-2011 compaction method in test procedures of road engineering asphalt and asphalt mixture to form the special asphalt mixture for treating the surface layer of the asphalt pavement by a layer-paving method, the mixing temperature is 120-140 ℃, the compaction temperature is 90-105 ℃, and the test results are shown in Table 3.

TABLE 3

And (4) conclusion: the experimental data of the embodiments 1, 2 and 3 of the invention completely meet the standard requirements.

Claims (3)

1. The special asphalt for treating the asphalt surface by a layer-paving method is characterized by comprising the following components in percentage by mass: 85-90 parts of asphalt, 10-13 parts of modifier, 0.5-1 part of cross-linking agent and 1-2 parts of carbon black; the asphalt is No. 70 road petroleum asphalt, No. 90 road petroleum asphalt or No. 100 road petroleum asphalt; the modifier is prepared from swelling oil and a styrene-butadiene-styrene block copolymer according to a mass ratio of 5-7: 3-5; the crosslinking agent is prepared from precipitated sulfur and an accelerator according to a mass ratio of 3-5: 5 to 7.

2. The special asphalt for treating the surface of the asphalt by a layer-laying method according to claim 1, wherein the swelling oil is heavy aromatic rubber oil, naphthenic oil, furfural extract oil or light extender oil; the styrene-butadiene-styrene block copolymer is SBSYH791, SBSYH792, SBS101 or SBS 4303; the accelerator is zinc oxide, magnesium oxide, lead oxide, a phenolic vulcanization accelerator H, a guanidine vulcanization accelerator D or thiuram; the carbon black is reinforcing carbon black or wear-resistant carbon black.

3. A method for preparing a special asphalt for treating the surface of a layered asphalt according to claim 1, which comprises the following steps in sequence:

a. uniformly stirring swelling oil, a styrene-butadiene-styrene block copolymer modifier and carbon black at 120-160 ℃ to prepare a mixture;

b. and (3) uniformly stirring the mixture and the asphalt at the temperature of 100-130 ℃, adding the precipitated sulfur and the accelerator, and continuously stirring and reacting for 30 minutes at the temperature of 100-130 ℃.