Preparation method of water reaction type cold patch asphalt mixture

Abstract

The invention discloses a preparation method of a water reaction type cold patch asphalt mixture. Belongs to the technical field of road engineering materials, and is prepared by the following steps: (1) adding a diluent and a single-component moisture-curing polyurethane prepolymer into matrix asphalt according to a certain proportion to prepare a reaction type asphalt mixed solution with low viscosity and fluidity at normal temperature, and (2) mixing with mineral aggregate to prepare the cold patch asphalt mixture for normal-temperature construction. According to the prepared cold patch asphalt mixture, the single-component moisture-cured polyurethane prepolymer is subjected to curing reaction after being in contact with moisture in water or air to form a cross-linked network structure, so that the strength of the asphalt mixture is greatly improved, and the cold patch asphalt mixture is excellent in water resistance and durability.

Description

Technical Field

[0001] The invention belongs to the technical field of road engineering materials and relates to a method for preparing a water-reactive cold patch asphalt mixture. Background Art

[0002] Asphalt pavement is a continuous pavement with a flat surface, good driving comfort, low noise pollution during driving, low dust generation, and easy washing and cleaning. It is currently an important pavement form. However, in the long-term use process, asphalt pavement gradually develops cracks, potholes, rutting and other defects under natural conditions and vehicle loads. Vehicles will be bumpy when driving on pothole sections, affecting driving comfort and traffic safety. After a period of time, under the influence of comprehensive loads, the potholes are connected into pieces, the base and roadbed become unstable and deformed, and the bearing capacity is partially lost. The road surface evolves from functional damage to structural damage, making the road lose its traffic capacity. Therefore, it is very important to repair the potholes on the asphalt pavement in a timely manner.

[0003] As an efficient and convenient road repair material, cold patch asphalt mixture is particularly suitable for sections with small engineering volume and relatively scattered potholes due to its simple construction process, fast construction time, short traffic opening time, and construction period not restricted by seasonal conditions. However, in the current cold patch material market, the quality of various cold patch materials varies, and there are several prominent problems: most cold patch materials have low initial strength, and they are damaged by the reciprocating action of traffic loads not long after being opened to traffic; cold patch materials have poor water stability, and are easily damaged by water during frequent rainfall in the rainy season, resulting in poor repair effects; cold patch materials have poor durability, and secondary damage will occur shortly after potholes are repaired under the combined action of loads and nature; the cold patch materials are not firmly bonded to the joints between the potholes, and diseases often occur at the joints, further worsening the diseases. Summary of the invention

[0004] In view of the above problems, the present invention aims to propose a method for preparing a water-reactive cold patch asphalt mixture.

[0005] The technical solution of the present invention is: a method for preparing a water-reactive cold patch asphalt mixture according to the present invention, the preparation steps of which are as follows:

[0006] Step 1: Heat the asphalt to 120-130°C, add aromatic oil of 10-20% of the asphalt mass while shearing and stirring, the shearing and stirring speed is 500-600r / min, keep shearing and stirring at the same temperature for 30-40min to obtain diluted asphalt, then add a high molecular polymer material with a mass ratio of 1:1-1:1.5 to the diluted asphalt and continue shearing and stirring for 30-40min, and cool to room temperature (25°C) to obtain a reactive asphalt mixture;

[0007] Step 2: Heat the mineral materials with different particle sizes at 150-160°C for 2-3 hours and then cool them to room temperature (25°C), mix the mineral materials cooled to room temperature (25°C) evenly according to the set gradation, add 5-7% of the reaction type asphalt mixture by mass of the mineral materials, stir evenly to obtain the water-reactive cold patch asphalt mixture;

[0008] Among them, when preparing asphalt mixture, the gradation of the mineral material is set to any gradation type in Table 1.

[0009] Table 1

[0010]

[0011] Furthermore, in step 1, the asphalt is one of 70# or 90#A grade road petroleum asphalt.

[0012] Furthermore, in step 1, the aromatic oil has an aromatic content of ≥95%, a flash point of ≥200°C, and a kinematic viscosity of ≤200 mm at 60°C. 2 / s.

[0013] Furthermore, in step 1, the high molecular polymer material is a single-component moisture-curable polyurethane prepolymer, which is prepared from polyether polyol and diisocyanate as main materials.

[0014] Furthermore, in step 2, the mineral material is one or more of limestone, basalt, diabase, and granite.

[0015] Furthermore, in step 2, the water-reactive cold patch asphalt mixture needs to be added with 1-3% of the mass of the asphalt mixture as a reactant during construction.

[0016] The beneficial effects of the present invention are as follows: 1. In the present invention, the single-component moisture-curing polyurethane prepolymer is added to the matrix asphalt and aromatic oil, and the mutual compatibility between the components is good. The single-component moisture-curing polyurethane will not react with the matrix asphalt, but only wraps the matrix asphalt and adheres to the surface of the mineral material. After contacting water or moisture in the air, a curing reaction occurs to form a cross-linked network structure, which greatly improves the strength of the early asphalt mixture; 2. The unique reaction mechanism of the single-component moisture-curing polyurethane prepolymer in the present invention can effectively reduce the components of the cold make-up liquid. The reactant is water, and no other materials are needed. The material is used as a curing agent to effectively reduce the research and development cost of the cold patch fluid; 3. The water-reactive cold patch asphalt mixture in the present invention has high initial strength and excellent comprehensive road performance, which makes up for the shortcomings of low initial strength, poor water resistance and durability of solvent-based cold patch materials; 4. The present invention reduces the viscosity of asphalt and increases the adhesion between asphalt and mineral materials by adding aromatic oil and a single-component wet-curing polyurethane prepolymer to the base asphalt, so that the water-reactive cold patch asphalt mixture can be constructed at room temperature, and the preparation method is simple, the process is flexible, and it is easy to construct, which has important application and promotion value. DETAILED DESCRIPTION

[0017] The specific technical scheme of the present invention is further described in detail below with reference to specific examples.

[0018] Example 1

[0019] A method for preparing a water-reactive cold patch asphalt mixture, the specific preparation steps are as follows:

[0020] Step (1): heating 70# road petroleum asphalt to 120°C, adding aromatic oil of 10% of the mass of the asphalt while shearing and stirring, the shearing and stirring speed is 500-600r / min, maintaining the shearing and stirring at the same temperature for 30 minutes to obtain diluted asphalt, and then adding a high molecular polymer material with a mass ratio of 1:1 to the diluted asphalt and continuing shearing and stirring for 40 minutes, cooling to room temperature (25°C) to obtain a reactive asphalt mixture, wherein the aromatic content of the aromatic oil is ≥95%, the flash point is ≥200°C, and the kinematic viscosity at 60°C is ≤200mm 2 / s;

[0021] Step (2): heat limestone aggregates of different particle sizes at 160° C. for 3 hours and then cool them to room temperature (25° C.), mix the aggregates cooled to room temperature (25° C.) uniformly according to the gradation 2 in Table 1, add a reactive asphalt mixture of 6% by mass of the aggregates, stir evenly to obtain a water-reactive cold patch asphalt mixture.

[0022] The specific construction method of the water-reactive cold patch asphalt mixture of this embodiment includes the following steps:

[0023] When repairing potholes on the road surface, it is only necessary to pour the water-reactive cold patch asphalt mixture in this embodiment into the cleaned potholes, add 1% of water by mass of the cold patch asphalt mixture, spread it evenly and then roll it to make it dense.

[0024] The performance of the water-reactive cold patch asphalt mixture of this embodiment was tested with reference to JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering".

[0025] It is known from tests that the standard Marshall stability of the water-reactive cold-patch asphalt mixture of this embodiment can reach 15 kN, the residual stability after immersion in water is greater than 100%, and the dynamic stability is greater than 20,000 times / mm.

[0026] Example 2

[0027] A method for preparing a water-reactive cold patch asphalt mixture, the specific preparation steps are as follows:

[0028] Step (1): heating 70# road petroleum asphalt to 120°C, adding aromatic oil of 20% of the mass of the asphalt while shearing and stirring, the shearing and stirring speed is 500-600r / min, maintaining the shearing and stirring at the same temperature for 30 minutes to obtain diluted asphalt, and then adding a high molecular polymer material with a mass ratio of 1:1 to the diluted asphalt and continuing shearing and stirring for 40 minutes, cooling to room temperature (25°C) to obtain a reactive asphalt mixture, wherein the aromatic content of the aromatic oil is ≥95%, the flash point is ≥200°C, and the kinematic viscosity at 60°C is ≤200mm 2 / s;

[0029] Step (2): heat limestone aggregates of different particle sizes at 160° C. for 3 hours and then cool them to room temperature (25° C.), mix the aggregates cooled to room temperature (25° C.) uniformly according to the gradation 2 in Table 1, add a reactive asphalt mixture of 6% by mass of the aggregates, stir evenly to obtain a water-reactive cold patch asphalt mixture.

[0030] The specific construction method of the water-reactive cold patch asphalt mixture of this embodiment includes the following steps:

[0031] When repairing potholes on the road surface, it is only necessary to pour the water-reactive cold patch asphalt mixture in this embodiment into the cleaned potholes, add 1% of water by mass of the cold patch asphalt mixture, spread it evenly and then roll it to make it dense.

[0032] The performance of the water-reactive cold patch asphalt mixture of this embodiment was tested with reference to JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering".

[0033] It is known from tests that the standard Marshall stability of the water-reactive cold-patch asphalt mixture of this embodiment can reach 12 kN, the residual stability after immersion in water is greater than 100%, and the dynamic stability is greater than 15,000 times / mm.

[0034] Example 3

[0035] A method for preparing a water-reactive cold patch asphalt mixture, the specific preparation steps are as follows:

[0036] Step (1): heating 90# road petroleum asphalt to 120°C, adding aromatic oil of 10% of the mass of the asphalt while shearing and stirring, the shearing and stirring speed is 500-600r / min, maintaining the shearing and stirring at the same temperature for 30 minutes to obtain diluted asphalt, and then adding a high molecular polymer material with a mass ratio of 1:1.5 to the diluted asphalt and continuing shearing and stirring for 40 minutes, cooling to room temperature (25°C) to obtain a reactive asphalt mixture, wherein the aromatic content of the aromatic oil is ≥95%, the flash point is ≥200°C, and the kinematic viscosity at 60°C is ≤200mm 2 / s;

[0037] Step (2): heat and keep granite ore of different particle sizes at 160° C. for 3 hours and then cool to room temperature (25° C.), mix the ore cooled to room temperature (25° C.) evenly according to the gradation 2 set in Table 1, add 7% of the mass of the ore into a reactive asphalt mixture, stir evenly to obtain a water-reactive cold patch asphalt mixture.

[0038] The specific construction method of the water-reactive cold patch asphalt mixture of this embodiment includes the following steps:

[0039] When repairing potholes on the road surface, it is only necessary to pour the water-reactive cold patch asphalt mixture in this embodiment into the cleaned potholes, add 3% water of the mass of the cold patch asphalt mixture, spread it evenly and compact it.

[0040] The performance of the water-reactive cold patch asphalt mixture of this embodiment was tested with reference to JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering".

[0041] It is known from tests that the standard Marshall stability of the water-reactive cold-patch asphalt mixture of this embodiment can reach 12 kN, the residual stability after immersion in water is greater than 100%, and the dynamic stability is greater than 15,000 times / mm.

[0042] Example 4

[0043] A method for preparing a water-reactive cold patch asphalt mixture, the specific preparation steps are as follows:

[0044] Step (1): heating 90# road petroleum asphalt to 120°C, adding aromatic oil of 20% of the mass of the asphalt while shearing and stirring, the shearing and stirring speed is 500-600r / min, maintaining the shearing and stirring at the same temperature for 30 minutes to obtain diluted asphalt, and then adding a high molecular polymer material with a mass ratio of 1:1.5 to the diluted asphalt and continuing shearing and stirring for 40 minutes, cooling to room temperature (25°C) to obtain a reactive asphalt mixture, wherein the aromatic content of the aromatic oil is ≥95%, the flash point is ≥200°C, and the kinematic viscosity at 60°C is ≤200mm 2 / s;

[0045] Step (2): heat and keep granite ore of different particle sizes at 160° C. for 3 hours and then cool to room temperature (25° C.), mix the ore cooled to room temperature (25° C.) evenly according to the gradation 2 set in Table 1, add 7% of the mass of the ore into a reactive asphalt mixture, stir evenly to obtain a water-reactive cold patch asphalt mixture.

[0046] The specific construction method of the water-reactive cold patch asphalt mixture of this embodiment includes the following steps:

[0047] When repairing potholes on the road surface, it is only necessary to pour the water-reactive cold patch asphalt mixture in this embodiment into the cleaned potholes, add 3% water of the mass of the cold patch asphalt mixture, spread it evenly and compact it.

[0048] The performance of the water-reactive cold patch asphalt mixture of this embodiment was tested with reference to JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering".

[0049] It is known from tests that the standard Marshall stability of the water-reactive cold-patch asphalt mixture of this embodiment can reach 10 kN, the residual stability after immersion in water is greater than 100%, and the dynamic stability is greater than 10,000 times / mm.

[0050] Example 5

[0051] A method for preparing a water-reactive cold patch asphalt mixture, the specific preparation steps are as follows:

[0052] Step (1): heating 70# road petroleum asphalt to 120°C, adding aromatic oil of 10% of the mass of the asphalt while shearing and stirring, the shearing and stirring speed is 500-600r / min, maintaining the shearing and stirring at the same temperature for 30 minutes to obtain diluted asphalt, and then adding a high molecular polymer material with a mass ratio of 1:1.5 to the diluted asphalt and continuing shearing and stirring for 40 minutes, cooling to room temperature (25°C) to obtain a reactive asphalt mixture, wherein the aromatic content of the aromatic oil is ≥95%, the flash point is ≥200°C, and the kinematic viscosity at 60°C is ≤200mm 2 / s;

[0053] Step (2): heat basalt ore of different particle sizes at 160°C for 3 hours and then cool to room temperature (25°C), mix the ore cooled to room temperature (25°C) according to the gradation 2 set in Table 1, add 7% of the mass of the ore into a reactive asphalt mixture, stir evenly to obtain a water-reactive cold patch asphalt mixture.

[0054] The specific construction method of the water-reactive cold patch asphalt mixture of this embodiment includes the following steps:

[0055] When repairing potholes on the road surface, it is only necessary to pour the water-reactive cold patch asphalt mixture in this embodiment into the cleaned potholes, add 3% water of the mass of the cold patch asphalt mixture, spread it evenly and compact it.

[0056] The performance of the water-reactive cold patch asphalt mixture of this embodiment was tested with reference to JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering".

[0057] It is known from tests that the standard Marshall stability of the water-reactive cold-patch asphalt mixture of this embodiment can reach 18 kN, the residual stability after immersion in water is greater than 100%, and the dynamic stability is greater than 30,000 times / mm.

[0058] Example 6

[0059] A method for preparing a water-reactive cold patch asphalt mixture, the specific preparation steps are as follows:

[0060] Step (1): heating 70# road petroleum asphalt to 120°C, adding aromatic oil of 20% of the mass of the asphalt while shearing and stirring, the shearing and stirring speed is 500-600r / min, maintaining the shearing and stirring at the same temperature for 30 minutes to obtain diluted asphalt, and then adding a high molecular polymer material with a mass ratio of 1:1.5 to the diluted asphalt and continuing shearing and stirring for 40 minutes, cooling to room temperature (25°C) to obtain a reactive asphalt mixture, wherein the aromatic content of the aromatic oil is ≥95%, the flash point is ≥200°C, and the kinematic viscosity at 60°C is ≤200mm 2 / s;

[0061] Step (2): heat basalt materials of different particle sizes at 160°C for 3 hours and then cool to room temperature (25°C), mix the materials cooled to room temperature (25°C) evenly according to the gradation 3 in Table 1, add 6% reactive asphalt mixture by mass of the materials, stir evenly to obtain a water-reactive cold patch asphalt mixture.

[0062] The specific construction method of the water-reactive cold patch asphalt mixture of this embodiment includes the following steps:

[0063] When repairing potholes on the road surface, it is only necessary to pour the water-reactive cold patch asphalt mixture in this embodiment into the cleaned potholes, add 3% water of the mass of the cold patch asphalt mixture, spread it evenly and compact it.

[0064] The performance of the water-reactive cold patch asphalt mixture of this embodiment was tested with reference to JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering".

[0065] It is known from tests that the standard Marshall stability of the water-reactive cold-patch asphalt mixture of this embodiment can reach 12 kN, the residual stability after immersion in water is greater than 100%, and the dynamic stability is greater than 15,000 times / mm.

Claims

1. A method for preparing a water-reactive cold patch asphalt mixture, characterized in that: The preparation steps are as follows: Step (1): heating the asphalt, adding 10-20% of the mass of the asphalt with aromatic oil while shearing and stirring to obtain diluted asphalt, then adding a high molecular polymer material with a mass ratio of 1:1-1:1.5 to the diluted asphalt and continuing to shear and stir, and obtaining a reactive asphalt mixture after cooling to room temperature; Step (2): After heating the mineral materials of different particle sizes and keeping them warm for 2-3 hours, the mineral materials cooled to room temperature are mixed evenly according to the set grading, and the prepared reactive asphalt mixture is added and stirred evenly to obtain a water-reactive cold patch asphalt mixture.

2. A method for preparing a water-reactive cold patch asphalt mixture according to claim 1, characterized in that: In step (1), the asphalt is one of 70# or 90#A grade road petroleum asphalt; The temperature to which the asphalt is heated is: 120-130°C.

3. The method for preparing a water-reactive cold patch asphalt mixture according to claim 1, characterized in that: In step (1), the aromatic oil has an aromatic content of ≥95%, a flash point of ≥200°C, and a kinematic viscosity of ≤200 mm at 60°C. 2 / s.

4. The method for preparing a water-reactive cold patch asphalt mixture according to claim 1, characterized in that: In step (1), the shear stirring speed is 500-600 r / min, and the shear stirring time is 30-40 min while maintaining the same temperature, thereby producing diluted asphalt.

5. The method for preparing a water-reactive cold patch asphalt mixture according to claim 1, characterized in that: In step (1), the high molecular polymer material is a single-component moisture-curable polyurethane prepolymer, which is prepared from polyether polyol and diisocyanate as main materials.

6. The method for preparing a water-reactive cold patch asphalt mixture according to claim 1, characterized in that: In step (1), the time for continuing shear stirring after adding the high molecular polymer material is 30-40 minutes.

7. The method for preparing a water-reactive cold patch asphalt mixture according to claim 1, characterized in that: In step (1), the mass of mineral material in the prepared reactive asphalt mixture is 5-7%.

8. The method for preparing a water-reactive cold patch asphalt mixture according to claim 1, characterized in that: In step (2), the mineral material is one or more of limestone, basalt, diabase, and granite.

9. The method for preparing a water-reactive cold patch asphalt mixture according to claim 1, characterized in that: In step (2), the temperature at which the mineral materials of different particle sizes are heated is 150-160°C.

10. A method for preparing a water-reactive cold patch asphalt mixture according to claim 1, characterized in that: In step (2), the water-reactive cold patch asphalt mixture needs to be added with 1-3% of the mass of the asphalt mixture as a reactant during construction.

Images