A method for repairing potholes in asphalt concrete pavement

Abstract

This invention discloses a method for repairing potholes in asphalt concrete pavements, specifically implemented according to the following steps: Step 1, using asphalt, limestone aggregate, and steel shot as raw materials, an induction-heated asphalt mixture containing steel shot is prepared in a mass percentage ratio of 1:8:12; Step 2, the mixture prepared in Step 1 is used to fill potholes in the asphalt concrete pavement and compacted until the mixture fills the pothole and is flush with the asphalt concrete pavement; Step 3, an induction heating machine is used to electromagnetically induction heat the induction-heated asphalt mixture containing steel shot in the pothole, and the repair is completed after cooling. This method for repairing potholes in asphalt concrete pavements solves the problems of high energy consumption and environmental pollution in existing hot paving processes, and short repair life and high cost in cold paving processes.

Description

Technical Field

[0001] This invention belongs to the field of road repair technology, specifically relating to a method for repairing potholes in asphalt concrete pavements. Background Technology

[0002] Currently, most highways in my country use asphalt concrete pavement. However, under the combined effects of external environment, load, and water, asphalt concrete pavement gradually develops fatigue cracks. If not maintained in time, these cracks will further develop into potholes. Potholes are a common type of asphalt concrete pavement distress, which reduces the lifespan of the asphalt pavement, degrades its road performance, and seriously affects driving comfort and safety.

[0003] Currently, the commonly used methods for pothole repair are hot-laying and cold-laying. Hot-laying primarily uses hot-mix asphalt (HMA), but its disadvantages include the need to maintain high temperatures (180℃) during construction, leading to high energy consumption and environmental pollution. The fumes generated during construction can also negatively impact the health of workers. Furthermore, excessively high temperatures can cause asphalt aging, significantly reducing its maintenance effectiveness. Cold-laying uses cold-mix asphalt (CMA). Although CMA is prepared at lower temperatures, its shorter repair life and higher material cost make it unsuitable for routine repairs along the entire road. In addition, to improve the quality of asphalt pavement maintenance, many studies have explored new maintenance materials such as polymers, resins, and polyurethanes. However, these materials are costly, hindering large-scale application. Summary of the Invention

[0004] The purpose of this invention is to provide a method for repairing potholes in asphalt concrete pavements, which solves the problems of high energy consumption and environmental pollution in existing hot paving processes, and short repair life and high cost in cold paving processes.

[0005] To achieve the above objectives, the technical solution adopted by this invention is: a method for repairing potholes in asphalt concrete pavements, specifically implemented according to the following steps:

[0006] Step 1: Prepare an induction-heated asphalt mixture containing steel shot using asphalt, limestone aggregate and steel shot as raw materials in a mass percentage ratio of 1:8:12.

[0007] Step 2: Use the mixture prepared in Step 1 to fill the potholes on the asphalt concrete pavement and compact it until the mixture fills the potholes and is flush with the asphalt concrete pavement.

[0008] Step 3: Use an induction heating machine to electromagnetically heat the induction heating asphalt mixture containing steel grit in the pit, and then cool it to complete the repair.

[0009] The technical solution of the present invention also has the following characteristics:

[0010] Furthermore, in step 1, the particle size of the limestone aggregate is no more than 5.0 mm.

[0011] Furthermore, in step 1, the particle size of the steel shot is between 0.180 and 1.000 mm.

[0012] Furthermore, in step 1, the preparation of the induction-heated asphalt mixture containing steel grit is specifically as follows:

[0013] Step 1.1: Heat the asphalt and limestone aggregate at 140–170℃ for 3–4 hours and 1–3 hours respectively;

[0014] Step 1.2: Add the limestone aggregate and steel shot obtained in Step 1.1 to the mixing pot and mix evenly. Mix at a speed of 1000-2000 r / min for 2-6 minutes. Then add the asphalt to the mixing pot and mix evenly. Mix again at a speed of 1000-2000 r / min for 3-5 minutes to obtain the mixture.

[0015] Step 1.3: Place the mixture obtained in step 1.2 into a grinding mold and compact it to obtain an induction-heated asphalt mixture containing steel grit.

[0016] Further, in step 1.2, the limestone aggregate and steel shot are added to the mixing pot and stirred evenly, specifically by stirring at a speed of 1000-2000 r / min for 2-6 minutes.

[0017] Further, in step 1.2, the asphalt is added to the mixing pot and stirred evenly, specifically by stirring at a speed of 1000-2000 r / min for 3-5 minutes.

[0018] Furthermore, in step 3, the power of the induction heating machine is 5 to 10 kW.

[0019] Furthermore, in step 3, the induction heating machine performs electromagnetic induction heating for 2 to 8 minutes.

[0020] Compared with the prior art, the asphalt concrete pavement pothole repair method of the present invention has the following advantages: (1) The asphalt concrete pavement pothole repair method of the present invention can store and transport the steel sand-containing induction asphalt mixture at room temperature. When it is necessary to repair the asphalt pavement pothole, the asphalt mixture can be directly poured into the pothole, and then the mixture is heated and compacted by electromagnetic induction heating, which can effectively reduce energy consumption and will not produce smoke during the heating process, ensuring the health and safety of construction personnel. (2) The asphalt concrete pavement pothole repair method of the present invention uses steel sand-containing induction-heated asphalt mixture with strong adhesion to the pothole surface and good bonding force between asphalt mixtures, which makes the asphalt mixture have high deformation resistance; (3) The asphalt concrete pavement pothole repair method of the present invention uses steel sand-containing induction-heated asphalt mixture with high density and low porosity. The lower the porosity, the better the mechanical properties and water damage resistance of the asphalt mixture; (4) The asphalt concrete pavement pothole repair method of the present invention uses steel sand-containing induction-heated asphalt mixture with better tensile strength and shear strength than cold-mix asphalt mixture, and its temperature performance is better than hot-mix asphalt mixture; (5) The asphalt concrete pavement pothole repair method of the present invention uses steel sand-containing induction-heated asphalt mixture, which can be used as the best material for pothole repair at present. It has high social and economic benefits and is worth promoting and applying in road maintenance projects; (6) The asphalt concrete pavement pothole repair method of the present invention is simple to construct, has high construction efficiency, and occupies a small area, which can improve the traffic flow of the maintained road section. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 This is a diagram of the internal structure of an induction-heated asphalt mixture containing steel shot;

[0023] Figure 2 This is a schematic diagram illustrating the process principle of a method for repairing potholes in asphalt concrete pavement according to the present invention.

[0024] In the diagram, 1. steel shot, 2. asphalt, 3. limestone aggregate, 4. voids, 5. induction-heated asphalt mixture containing steel shot, and 6. pits. Detailed Implementation

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1As shown, the method for repairing potholes in asphalt concrete pavement according to the present invention is implemented according to the following steps:

[0027] Step 1: Prepare an induction-heated asphalt mixture containing steel shot using asphalt, limestone aggregate, and steel shot as raw materials in a mass ratio of 1:8:12; the particle size of the limestone aggregate shall not exceed 5.0 mm, and the particle size of the steel shot shall be 0.180 to 1.000 mm.

[0028] The specific steps for preparing induction-heated asphalt mixtures containing steel grit are as follows:

[0029] Step 1.1: Heat the asphalt and limestone aggregate at 140–170℃ for 3–4 hours and 1–3 hours respectively;

[0030] Step 1.2: Add the limestone aggregate and steel grit obtained in Step 1.1 to the mixing pot and stir at a speed of 1000-2000 r / min for 2-6 min. Then add the asphalt to the mixing pot and stir at a speed of 1000-2000 r / min for 3-5 min to obtain the mixture.

[0031] Step 1.3: The mixture obtained in Step 1.2 is placed in a grinding mold and compacted to obtain an induction-heated asphalt mixture containing steel grit;

[0032] Step 2: Use the mixture prepared in Step 1 to fill the potholes on the asphalt concrete pavement and compact it until the mixture fills the potholes and is flush with the asphalt concrete pavement.

[0033] Step 3: Use an induction heating machine to electromagnetically induction heat the induction heating asphalt mixture containing steel grit in the pit. The power of the induction heating machine is 5-10 kW, and the electromagnetic induction heating time is 2-8 minutes. After that, the mixture is cooled to complete the repair.

[0034] Compared with the prior art, the asphalt concrete pavement pothole repair method of the present invention has the following advantages: (1) The asphalt concrete pavement pothole repair method of the present invention can store and transport the steel sand-containing induction asphalt mixture at room temperature. When it is necessary to repair the asphalt pavement pothole, the asphalt mixture can be directly poured into the pothole, and then the mixture is heated and compacted by electromagnetic induction heating, which can effectively reduce energy consumption and will not produce smoke during the heating process, ensuring the health and safety of construction personnel. (2) The asphalt concrete pavement pothole repair method of the present invention uses steel sand-containing induction-heated asphalt mixture with strong adhesion to the pothole surface and good bonding force between asphalt mixtures, which makes the asphalt mixture have high deformation resistance; (3) The asphalt concrete pavement pothole repair method of the present invention uses steel sand-containing induction-heated asphalt mixture with high density and low porosity. The lower the porosity, the better the mechanical properties and water damage resistance of the asphalt mixture; (4) The asphalt concrete pavement pothole repair method of the present invention uses steel sand-containing induction-heated asphalt mixture with better tensile strength and shear strength than cold-mix asphalt mixture, and its temperature performance is better than hot-mix asphalt mixture; (5) The asphalt concrete pavement pothole repair method of the present invention uses steel sand-containing induction-heated asphalt mixture, which can be used as the best material for pothole repair at present. It has high social and economic benefits and is worth promoting and applying in road maintenance projects; (6) The asphalt concrete pavement pothole repair method of the present invention is simple to construct, has high construction efficiency, and occupies a small area, which can improve the traffic flow of the maintained road section.

[0035] Example 1

[0036] The present invention provides a method for repairing potholes in asphalt concrete pavements, which is implemented according to the following steps:

[0037] Step 1: Prepare an induction-heated asphalt mixture containing steel shot using asphalt, limestone aggregate, and steel shot as raw materials in a mass ratio of 1:8:12; the particle size of the limestone aggregate shall not exceed 5.0 mm, and the particle size of the steel shot shall be 0.180 mm.

[0038] The specific steps for preparing induction-heated asphalt mixtures containing steel grit are as follows:

[0039] Step 1.1: Heat asphalt and limestone aggregate at 140℃ for 3 hours and 1 hour respectively;

[0040] Step 1.2: Add the limestone aggregate and steel grit obtained in Step 1.1 to the mixing pot and stir at 1000 r / min for 2 min. Then add the asphalt to the mixing pot and stir at 1000 r / min for 3 min to obtain the mixture.

[0041] Step 1.3: The mixture obtained in Step 1.2 is placed in a grinding mold and compacted to obtain an induction-heated asphalt mixture containing steel grit;

[0042] Step 2: Use the mixture prepared in Step 1 to fill the potholes on the asphalt concrete pavement and compact it until the mixture fills the potholes and is flush with the asphalt concrete pavement.

[0043] Step 3: Use an induction heating machine to electromagnetically induction heat the steel grit-containing induction heating asphalt mixture in the pit. The power of the induction heating machine is 5kw, and the electromagnetic induction heating time is 2 minutes. After that, the mixture is cooled to complete the repair.

[0044] Example 2

[0045] The present invention provides a method for repairing potholes in asphalt concrete pavements, which is implemented according to the following steps:

[0046] Step 1: Prepare an induction-heated asphalt mixture containing steel shot using asphalt, limestone aggregate, and steel shot as raw materials in a mass ratio of 1:8:12; the particle size of the limestone aggregate shall not exceed 5.0 mm, and the particle size of the steel shot shall be 0.190 mm.

[0047] The specific steps for preparing induction-heated asphalt mixtures containing steel grit are as follows:

[0048] Step 1.1: Heat the asphalt and limestone aggregate at 155℃ for 3.5h and 2.5h respectively;

[0049] Step 1.2: Add the limestone aggregate and steel grit obtained in Step 1.1 to the mixing pot and stir at 1500 r / min for 4 min. Then add the asphalt to the mixing pot and stir at 1500 r / min for 4 min to obtain the mixture.

[0050] Step 1.3: The mixture obtained in Step 1.2 is placed in a grinding mold and compacted to obtain an induction-heated asphalt mixture containing steel grit;

[0051] Step 2: Use the mixture prepared in Step 1 to fill the potholes on the asphalt concrete pavement and compact it until the mixture fills the potholes and is flush with the asphalt concrete pavement.

[0052] Step 3: Use an induction heating machine to electromagnetically induction heat the steel grit-containing induction heating asphalt mixture in the pit. The power of the induction heating machine is 7kw, and the electromagnetic induction heating time is 5 minutes. After that, the mixture is cooled to complete the repair.

[0053] Example 3

[0054] The present invention provides a method for repairing potholes in asphalt concrete pavements, which is implemented according to the following steps:

[0055] Step 1: Prepare an induction-heated asphalt mixture containing steel shot using asphalt, limestone aggregate, and steel shot as raw materials in a mass ratio of 1:8:12; the particle size of the limestone aggregate shall not exceed 5.0 mm, and the particle size of the steel shot shall be 1.000 mm.

[0056] The specific steps for preparing induction-heated asphalt mixtures containing steel grit are as follows:

[0057] Step 1.1: Heat the asphalt and limestone aggregate at 170℃ for 4 hours and 3 hours respectively;

[0058] Step 1.2: Add the limestone aggregate and steel grit obtained in Step 1.1 to the mixing pot and stir at 2000 r / min for 6 min. Then add the asphalt to the mixing pot and stir at 2000 r / min for 5 min to obtain the mixture.

[0059] Step 1.3: The mixture obtained in Step 1.2 is placed in a grinding mold and compacted to obtain an induction-heated asphalt mixture containing steel grit;

[0060] Step 2: Use the mixture prepared in Step 1 to fill the potholes on the asphalt concrete pavement and compact it until the mixture fills the potholes and is flush with the asphalt concrete pavement.

[0061] Step 3: Use an induction heating machine to electromagnetically induction heat the steel grit-containing induction heating asphalt mixture in the pit. The power of the induction heating machine is 10kw, and the electromagnetic induction heating time is 8 minutes. After that, the mixture is cooled to complete the repair.

[0062] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the invention should be within the protection scope of the appended claims.

Claims

1. A method of repairing a pothole in an asphalt concrete pavement, characterized by, The method is implemented according to the following steps: Step 1: preparing the steel-sand-containing induction heating asphalt mixture according to the mass percentage of 1:8:12 by taking asphalt, limestone aggregate and steel sand as raw materials; the particle size of the limestone aggregate is not more than 5.0 mm, and the particle size of the steel sand is 0.180-1.000 mm; Step 2: filling the pit and groove on the asphalt concrete pavement with the mixture prepared in Step 1 and compacting until the mixture fills the pit and groove and is flush with the asphalt concrete pavement; Step 3: using the induction heating machine to perform electromagnetic induction heating on the steel-sand-containing induction heating asphalt mixture in the pit and groove, and completing the repair after cooling; In Step 1, the steel-sand-containing induction heating asphalt mixture is prepared as follows: Step 1.1: heating the asphalt and the limestone aggregate at 140-170 ℃ for 3-4 h and 1-3 h respectively; Step 1.2: adding the limestone aggregate and the steel sand obtained in Step 1.1 into a stirring pot and stirring uniformly, and then adding the asphalt into the stirring pot and stirring uniformly to obtain the mixture; Step 1.3: placing the mixture obtained in Step 1.2 in a mold and compacting to obtain the steel-sand-containing induction heating asphalt mixture; In Step 1.2, the limestone aggregate and the steel sand are added into the stirring pot and stirred uniformly at a stirring speed of 1000-2000 r / min for 2-6 min; and the asphalt is added into the stirring pot and stirred uniformly at a stirring speed of 1000-2000 r / min for 3-5 min.

2. The asphalt concrete pavement pothole repair method according to claim 1, characterized by, In Step 3, the power of the induction heating machine is 5-10 kw.

3. The asphalt concrete pavement pothole repair method according to claim 1, characterized by, In Step 3, the induction heating machine performs electromagnetic induction heating for 2-8 min.

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