Natural rock asphalt composite modified asphalt mixture product and preparation method thereof

Abstract

The invention relates to the technical field of chemical engineering, in particular to a natural rock asphalt composite modified asphalt mixture product and a preparation method thereof, and the product comprises the following components in percentage by mass: 25-35% of natural rock asphalt powder, 5-8% of cosolvent, 4-7% of stabilizer, 55-65% of modified asphalt and the balance of unavoidable impurities. The method comprises the following steps: mixing 5-15% of rubber powder, 5-15% of resin, 60-80% of matrix asphalt and 2-11% of high-molecular polymer, and shearing at a high speed to obtain modified asphalt; s2, heating the modified asphalt to a molten flow state, and uniformly mixing and stirring 25-35% of natural rock asphalt powder, 5-8% of a cosolvent, 4-7% of a stabilizer and 55-65% of the modified asphalt to obtain a finished product. According to the natural rock asphalt composite modified asphalt mixture product prepared by the method, the dynamic modulus of the asphalt mixture can be effectively improved, the high-temperature deformation resistance of the asphalt mixture is enhanced, the structural bearing capacity and rutting resistance of an asphalt pavement are improved, and the service life of the asphalt pavement is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of chemical technology, and in particular to a natural rock asphalt composite modified asphalt mixture product and a preparation method thereof. Background Art

[0002] Natural asphalt is also called ground asphalt or mineral asphalt. It is a transformation product of petroleum. When crude oil penetrates into the ground, the light components are evaporated, and then oxidized by oxygen in the air under sunlight, and then polymerized to become asphalt minerals. It is mainly composed of colloids such as asphaltene and resin, as well as a small amount of other mineral impurities such as metals and non-metals. Most of this asphalt has been naturally evaporated and oxidized, and generally does not contain toxins.

[0003] In the prior art, natural rock asphalt is often used as a natural enhancer. Natural rock asphalt can enhance the performance of asphalt products and is therefore widely used in engineering materials. Due to the limitations of various factors such as the physical and chemical properties of natural asphalt and production, it is generally not used directly as an asphalt alone, but is mixed with materials such as base asphalt to enhance the final performance of asphalt. The currently prepared natural rock asphalt composite modified asphalt mixture products have the defects of poor high temperature deformation resistance and poor pavement structure bearing capacity. Summary of the invention

[0004] The present invention aims to solve the technical problems in the prior art of poor high-temperature deformation resistance and pavement structure bearing capacity of natural rock asphalt composite modified asphalt mixture products, and provides a natural rock asphalt composite modified asphalt mixture product and a preparation method thereof.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A natural rock asphalt composite modified asphalt mixture product contains, by mass percentage, 25% to 35% of natural rock asphalt powder, 5% to 8% of co-solvent, 4% to 7% of stabilizer, 55% to 65% of modified asphalt, and the rest are inevitable impurities.

[0007] Furthermore, the modified asphalt contains, by mass percentage, 5% to 15% of rubber powder, 5% to 15% of resin, 60% to 80% of base asphalt and 2% to 11% of high molecular polymer.

[0008] Furthermore, the high molecular polymer is one or more of SBR, SBS, SEBS, SIS, rubber powder and PP.

[0009] Furthermore, the co-solvent is one or more of aromatic hydrocarbon oil, cycloalkane oil and rubber oil.

[0010] Furthermore, the stabilizer is one or more of sulfur, carbon black, polystyrene, silicate cement and calcium carbonate.

[0011] Furthermore: the natural asphalt is one or more of Butun rock asphalt, TLA lake asphalt and Qingchuan rock asphalt.

[0012] Furthermore, the particle size of the natural rock asphalt powder is 80 to 100 meshes.

[0013] The embodiment of the present invention also provides a method for preparing a natural rock asphalt composite modified asphalt mixture product, comprising the following steps:

[0014] S1. Mix 5% to 15% of rubber powder, 5% to 15% of resin, 60% to 80% of base asphalt and 2% to 11% of high molecular polymer, and obtain modified asphalt by high-speed shearing;

[0015] S2. The modified asphalt is heated to a molten flow state, and 25% to 35% of natural rock asphalt powder, 5% to 8% of a solvent, 4% to 7% of a stabilizer and 55% to 65% of the modified asphalt are mixed and stirred uniformly to obtain a finished product.

[0016] Furthermore, in step S1, the temperature is controlled to be 180-230° C., and the high-speed shearing speed is 3500-4500 r / min.

[0017] Furthermore, in step S2, the temperature is controlled to be 160-170° C., and the high-speed shearing speed is 1500-2000 r / min.

[0018] The natural rock asphalt composite modified asphalt mixture product provided by the present invention has at least the following beneficial effects or advantages:

[0019] The natural rock asphalt composite modified asphalt mixture product provided by the present invention contains, by mass percentage: 25% to 35% natural rock asphalt powder, 5% to 8% cosolvent, 4% to 7% stabilizer, 55% to 65% modified asphalt, and the rest are inevitable impurities. The preparation method of the natural rock asphalt composite modified asphalt mixture product comprises the following steps: 5% to 15% rubber powder, 5% to 15% resin, 60% to 80% matrix asphalt and 2% to 11% high molecular polymer are mixed, and the modified asphalt is obtained by high-speed shearing; the modified asphalt is heated to a molten flow state, and 25% to 35% natural rock asphalt powder, 5% to 8% cosolvent, 4% to 7% stabilizer and 55% to 65% modified asphalt are mixed and stirred uniformly to obtain a finished product. The natural rock asphalt composite modified asphalt mixture product prepared by the above method can effectively improve the dynamic modulus of the asphalt mixture, enhance the high temperature deformation resistance of the asphalt mixture, improve the bearing capacity and anti-rutting ability of the asphalt pavement structure, and extend the service life of the asphalt pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A flow chart of a method for preparing a natural rock asphalt composite modified asphalt mixture product provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention aims to solve the technical problems in the prior art of poor high-temperature deformation resistance and pavement structure bearing capacity of natural rock asphalt composite modified asphalt mixture products, and provides a natural rock asphalt composite modified asphalt mixture product and a preparation method thereof.

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] The present embodiment provides a natural rock asphalt composite modified asphalt mixture product, which contains, by mass percentage, 35% natural rock asphalt powder, 5% co-solvent, 4% stabilizer, 56% modified asphalt, and the rest are unavoidable impurities.

[0025] The modified asphalt contains 15% rubber powder, 15% resin, 65% matrix asphalt and 5% high molecular polymer by mass percentage. The high molecular polymer is a mixture of SBR, SBS, SEBS, SIS, rubber powder and PP. The cosolvent is a mixture of aromatic hydrocarbon oil, cycloparaffin oil and rubber oil. The stabilizer is a mixture of sulfur, carbon black, polystyrene, silicate cement and calcium carbonate. The natural asphalt is a mixture of Butun rock asphalt, TLA Lake asphalt and Qingchuan rock asphalt. The particle size of the natural rock asphalt powder is 100 mesh.

[0026] Example 2

[0027] The present embodiment provides a natural rock asphalt composite modified asphalt mixture product, which contains, by mass percentage, 22% natural rock asphalt powder, 8% co-solvent, 6% stabilizer, 64% modified asphalt, and the rest are unavoidable impurities.

[0028] The modified asphalt contains 15% of rubber powder, 5% of resin, 70% of base asphalt and 10% of high molecular polymer by mass percentage. The high molecular polymer is a mixture of SBR and SIS. The cosolvent is aromatic hydrocarbon oil. The stabilizer is a mixture of sulfur, carbon black, polystyrene and silicate cement. The natural asphalt is Buton rock asphalt. The particle size of the natural rock asphalt powder is 80 meshes.

[0029] Example 3

[0030] The present embodiment provides a natural rock asphalt composite modified asphalt mixture product, which contains, by mass percentage, 28% natural rock asphalt powder, 6% co-solvent, 5% stabilizer, 61% modified asphalt, and the rest are unavoidable impurities.

[0031] The modified asphalt contains 7% rubber powder, 10% resin, 75% matrix asphalt and 8% high molecular polymer by mass percentage. The high molecular polymer is a mixture of SBR, SBS and PP. The cosolvent is a mixture of aromatic hydrocarbon oil and cycloalkane oil. The stabilizer is a mixture of sulfur, carbon black and polystyrene. The natural asphalt is a mixture of Butun rock asphalt, TLA Lake asphalt and Qingchuan rock asphalt. The particle size of the natural rock asphalt powder is 85 mesh.

[0032] Example 4

[0033] The present embodiment provides a natural rock asphalt composite modified asphalt mixture product, which contains, by mass percentage, 30% natural rock asphalt powder, 8% co-solvent, 7% stabilizer, 55% modified asphalt, and the rest are unavoidable impurities.

[0034] The modified asphalt contains, by mass percentage, 10% rubber powder, 13% resin, 75% matrix asphalt and 2% high molecular polymer. The high molecular polymer is SBR. The cosolvent is aromatic hydrocarbon oil. The stabilizer is a mixture of sulfur, carbon black, polystyrene, silicate cement and calcium carbonate. The natural asphalt is a mixture of Butun rock asphalt, TLA Lake asphalt and Qingchuan rock asphalt. The particle size of the natural rock asphalt powder is 95 mesh.

[0035] Example 5

[0036] This embodiment also provides a method for preparing a natural rock asphalt composite modified asphalt mixture product, comprising the following steps:

[0037] S1. Mix 10% of rubber powder, 13% of resin, 75% of base asphalt and 2% of high molecular polymer, and obtain modified asphalt by high-speed shearing. In step S1, the temperature is controlled to be 200° C. and the high-speed shearing speed is 3500 r / min.

[0038] S2, heating the modified asphalt to a molten flow state, mixing and stirring 28% natural rock asphalt powder, 6% cosolvent, 5% stabilizer, and 61% modified asphalt to obtain a finished product. In step S2, the temperature is controlled to be 160°C and the high-speed shear speed is 2000r / min.

[0039] The natural rock asphalt composite modified asphalt mixture product provided by the embodiment of the present invention has at least the following beneficial effects or advantages:

[0040] The natural rock asphalt composite modified asphalt mixture product provided by the embodiment of the present invention contains, by mass percentage: 25% to 35% natural rock asphalt powder, 5% to 8% cosolvent, 4% to 7% stabilizer, 55% to 65% modified asphalt, and the rest are inevitable impurities. The preparation method of the natural rock asphalt composite modified asphalt mixture product is to mix 5% to 15% rubber powder, 5% to 15% resin, 60% to 80% matrix asphalt and 2% to 11% high molecular polymer, and obtain modified asphalt by high-speed shearing; the modified asphalt is heated to a molten flow state, and 25% to 35% natural rock asphalt powder, 5% to 8% cosolvent, 4% to 7% stabilizer and 55% to 65% modified asphalt are mixed and stirred evenly to obtain a finished product. The natural rock asphalt composite modified asphalt mixture product prepared by the above method can effectively improve the dynamic modulus of the asphalt mixture, enhance the high temperature deformation resistance of the asphalt mixture, improve the bearing capacity and anti-rutting ability of the asphalt pavement structure, and extend the service life of the asphalt pavement.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A natural rock asphalt composite modified asphalt mixture product, characterized in that: The content of the mixture by mass percentage is: 25% to 35% of natural rock asphalt powder, 5% to 8% of co-solvent, 4% to 7% of stabilizer, 55% to 65% of modified asphalt, and the rest are inevitable impurities.

2. The natural rock asphalt composite modified asphalt mixture product according to claim 1, characterized in that: The modified asphalt contains, by mass percentage, 5% to 15% of rubber powder, 5% to 15% of resin, 60% to 80% of base asphalt and 2% to 11% of high molecular polymer.

3. The natural rock asphalt composite modified asphalt mixture product according to claim 2, characterized in that: The high molecular polymer is one or more of SBR, SBS, SEBS, SIS, rubber powder and PP.

4. The natural rock asphalt composite modified asphalt mixture product according to claim 1, characterized in that: The cosolvent is one or more of aromatic hydrocarbon oil, cycloalkane oil and rubber oil.

5. The natural rock asphalt composite modified asphalt mixture product according to claim 1, characterized in that: The stabilizer is one or more of sulfur, carbon black, polystyrene, silicate cement and calcium carbonate.

6. The natural asphalt composite modified asphalt mixture product according to claim 1, characterized in that: The natural asphalt is one or more of Butun rock asphalt, TLA lake asphalt and Qingchuan rock asphalt.

7. The natural rock asphalt composite modified asphalt mixture according to claim 1, characterized in that: The particle size of natural rock asphalt powder is 80-100 mesh.

8. A method for preparing the natural rock asphalt composite modified asphalt mixture product according to claim 1, characterized in that: The steps include: S1. Mix 5% to 15% of rubber powder, 5% to 15% of resin, 60% to 80% of base asphalt and 2% to 11% of high molecular polymer, and obtain modified asphalt by high-speed shearing; S2. The modified asphalt is heated to a molten flow state, and 25% to 35% of natural rock asphalt powder, 5% to 8% of a solvent, 4% to 7% of a stabilizer and 55% to 65% of the modified asphalt are mixed and stirred uniformly to obtain a finished product.

9. The method for preparing the natural rock asphalt composite modified asphalt mixture product according to claim 8, characterized in that: In step S1, the temperature is controlled to be 180-230°C and the high-speed shearing speed is 3500-4500 r / min.

10. The method for preparing the natural rock asphalt composite modified asphalt mixture product according to claim 8, characterized in that: In step S2, the temperature is controlled to be 160-170°C and the high-speed shearing speed is 1500-2000 r / min.

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