Asphalt pavement crack repairing structure

Abstract

The utility model discloses an asphalt pavement crack repairing structure, which comprises a repairing filler layer, a crack sticking belt, a polyurea coating and rubber powder, the repairing filler layer is filled in an asphalt pavement crack by adopting repairing filler, and the crack sticking belt is stuck on the surface of the repairing filler layer and the surface of the asphalt pavement on two sides of the repairing filler layer. The polyurea coating is formed by coating the surface of the seam attaching belt with polyurea paint, and the rubber powder is spread on the surface of the polyurea coating. The repairing filler is filled into the asphalt pavement crack under the conditions of no grooving and no heating to reinforce the asphalt pavement and support the stress of the crack sticking belt, the surface of the crack sticking belt is coated with the polyurea coating to improve the capabilities of water resistance, corrosion resistance, toughness, impact resistance, wear resistance and the like of the repairing structure, and the spread rubber powder plays a role in protecting the crack sticking belt and the polyurea coating.

Description

TECHNICAL FIELD

[0001] The utility model relates to road construction and maintenance technical field, concretely relates to a pitch pavement crack repair structure. BACKGROUND

[0002] Road maintenance is the center link in highway maintenance work. The pitch pavement is the main structure form of Chinese highway and urban road pavement. The crack type damage is the leading damage mode of pitch pavement. If the pavement crack cannot be treated in time and effectively, with the lapse of time, the crack width will gradually increase, under the action of road surface water, there will be obvious free water in the crack gap, and it will quickly infiltrate to the inside of pavement structure, the bottom of base layer and even roadbed and cannot be discharged, under the repeated action of a large number of vehicle loads, the water pressure in the inside of pavement structure will be very large, will gradually scour and hollow out the pavement structure, appear pavement slurry, pit and groove and pavement subsidence and other diseases, finally will lead to the pavement to produce structural damage quickly, make the road structure gradually lose the bearing capacity.

[0003] The causes of various cracks of pitch pavement are very complex. Due to the different causes, the vertical depth of the cracks in the pavement structure is quite different. At the same time, often due to the existence of the cracks, the underlying layer of the pavement structure (or pitch surface layer) is discontinuous in stiffness or load transmission, therefore, the treatment of only the pavement structure (or pitch surface layer) is not complete, and the repair effect is poor. But the cracks of pitch pavement often appear in the use process, and it is inevitable, the key is how to treat after the cracks appear. As long as the cracks are found, the sealing treatment is the most important, to prevent the rainwater infiltration from affecting the strength of pavement base layer and bottom layer and causing vicious cycle. The existing pitch pavement crack repair methods are mainly divided into two types, one is the glue filling repair method, and the other is the sealing tape repair method.

[0004] The glue filling repair method is to clean the cracks, groove or not groove, and fill the heated material or material without heating into the crack. The groove, hot repair method has the defects of needing to heat the repair material, being not friendly to the environment and workers, limited material penetration, unable to guarantee the quality, and being unable to achieve the real repair effect. The groove, hot repair method has the defects of large equipment investment, high cost, expanding the pavement damage area, and being only able to block the surface cracks due to the limited penetration of the hot repair material, and being not friendly to the environment and workers. The cold repair method has the defect of being unable to produce long-term and effective sealing of the cracks.

[0005] The patching method of the joint tape is a new type of crack repairing method, which can make up for the shortcomings of the joint filling and joint pouring technology, is suitable for treating the fine cracks of the pavement, can open the traffic after the joint tape is attached, has high efficiency, and is more environmentally friendly without waste gas emission. The biggest problem is that the patching method of the joint tape belongs to the surface treatment, cannot reinforce and strengthen the disease area, cannot consider both the specimen and the time, and will lose the effect with the aging of the material.

[0006] In summary, the two main problems of the asphalt pavement crack repairing are to reinforce and strengthen the disease area and to waterproof the disease area. Practical new type content

[0007] The utility model discloses a kind of asphalt pavement crack repairing structures, to solve the above technical problems of prior art.

[0008] To achieve the above object, the utility model provides the following technical scheme:

[0009] An asphalt pavement crack repairing structure, including repairing filler layer, joint tape, polyurea coating, rubber powder, the repairing filler layer is filled in asphalt pavement crack with repairing filler, the joint tape is attached on the surface of repairing filler layer and the surface of asphalt pavement on both sides of repairing filler layer, the polyurea coating is coated on the surface of joint tape with polyurea coating material, the rubber powder is spread on the surface of polyurea coating.

[0010] Preferably, the repairing filler is mixed by consolidation glue and hard particles with mass ratio 1: (10-20), and the mass ratio is preferably 1: (10-15).

[0011] Preferably, the consolidation glue is epoxy structure glue.

[0012] Preferably, the hard particles are one or more of quartz sand, diabase, basalt and river sand, and the particle size is 1-2mm.

[0013] Preferably, the thickness of the joint tape is not less than 2mm, and the width of the joint tape extends 2-3cm to both sides of the crack.

[0014] Preferably, the thickness of the polyurea coating is not less than 0.1mm, and the width matches the joint tape.

[0015] Preferably, the polyurea coating material is type I polyurea waterproof coating material.

[0016] Preferably, the particle size of the rubber powder is 40-80 mesh.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The repairing filler in the utility model fills into the asphalt pavement crack under the condition of not slotting and not heating, and can even fill into the base crack below the asphalt pavement, can play the role of reinforcing and reinforcing, and supports the stress of the joint tape at the same time, and the polyurea coating is coated on the surface of the joint tape, can improve the waterproof, anticorrosive, toughness, impact resistance, wear resistance and other abilities of the repairing structure, adapts to the characteristics of high working temperature of the asphalt pavement, is fast in construction, long in service life, pollution-free, mature in material, easy to purchase and convenient to popularize and apply, and the rubber powder on the polyurea coating can play the role of extinction and beautification, and plays the protection role on the joint tape and the polyurea coating. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic view of the asphalt pavement crack repairing structure.

[0020] In the figure: 1 - repairing filler layer; 2 - joint tape; 3 - polyurea coating and rubber powder; 4 - asphalt pavement; 5 - base. DETAILED DESCRIPTION

[0021] The utility model will be clearly and completely described in connection with the drawings and examples.

[0022] The utility model provides a kind of asphalt pavement crack repairing structure, including repairing filler layer 1, joint tape 2, polyurea coating and rubber powder 3, repairing filler layer 1 is filled in asphalt pavement 5 crack with repairing filler, joint tape 2 is attached in the surface of repairing filler layer 1 and the surface of asphalt pavement 4 on the both sides of repairing filler layer 1, polyurea coating 3 is coated on the surface of joint tape 2 with polyurea coating, and rubber powder is spread on the surface of polyurea coating;Asphalt pavement 4 below is base 5.

[0023] The patching filler is mixed by solidifying glue and hard particles in a mass ratio of 1: (10-20), preferably 1: (10-15). The solidifying glue is epoxy structural glue, and the hard particles are one or more of quartz sand, diabase, basalt, and river sand, with a particle size of 1-2 mm. By using the principle of sandglass, the patching filler is filled into the inside of the crack by physical methods such as vibration. After the epoxy structural glue is solidified, it forms a kind of porous and solidified body together with the hard particles, and is bonded with the asphalt pavement structure as a whole, achieving the effect of reinforcement and reinforcement. The smaller the viscosity of the epoxy structural glue, the better the penetration effect. However, the penetration amount of the epoxy structural glue cannot be controlled when facing cracks with a certain depth. Therefore, if only the epoxy structural glue is used to fill the asphalt pavement cracks, the pavement reinforcement effect cannot be achieved. The hard particles have a certain roughness on the surface, and the hard particles filled into the cracks will absorb the epoxy structural glue, play a liquid storage role, and the hard particles themselves also have good bearing capacity; thus, the disadvantage of incomplete filling of cracks in actual operation can be avoided. At the same time, the adsorption of the hard particles to the epoxy structural glue will guide and accelerate the penetration of the epoxy structural glue into the cracks, improving the construction efficiency.

[0024] The performance requirements of the epoxy structural glue are as follows:

[0025]

[0026] The sealing tape has unique adhesion to the asphalt pavement, and is firmly adhered to the surface of the asphalt pavement crack, which can play the role of waterproofing the pavement and protecting the patching filler layer. The thickness of the sealing tape is not less than 2 mm, and the width of the sealing tape extends 2-3 cm to both sides of the crack. The sealing tape has four types of high temperature type, ordinary type, low temperature type and severe cold type, which are respectively suitable for 0℃, -10℃, -20℃ and -30℃ areas.

[0027] The technical indicators of the self-adhesive sealing tape are as follows:

[0028]

[0029] Polyurea coating and rubber powder serve as a protective layer for the joint sealing tape, enhancing its embedding resistance and weather resistance. The polyurea coating exhibits excellent adhesion to the joint sealing tape, demonstrating strength, elasticity, and superior wear resistance and durability. The polyurea coating thickness is no less than 0.1mm, and its width matches the joint sealing tape. Type I polyurea waterproof coating is used. The polyurea coating is easy to apply, forming a firmly bonded whole with the joint sealing tape (i.e., crack-resistant tape), effectively improving the tensile strength of the crack-resistant tape and providing effective protection. The rubber powder, with a particle size of 40-80 mesh, is readily available, easy to apply, and readily absorbed and adhered to the polyurea coating. It is non-reflective, both beautifying and further protecting the joint sealing tape, making it economical and practical. The polyurea coating is evenly applied to the surface of the joint sealing tape (i.e., crack-resistant tape) by brushing, rolling, or spraying, followed by evenly sprinkling the rubber powder, ensuring sufficient coverage of the polyurea coating without causing it to reflect light after film formation. Other particle sizes of rubber powder can also be used, but the inventors found through on-site testing that rubber powder with a particle size of 40-80 mesh has good adhesion to polyurea coatings and is more suitable for driving environments.

[0030] The main performance parameters of Type I polyurea waterproof coating are as follows:

[0031]

[0032] Example 1;

[0033] This embodiment is a case study of asphalt pavement crack repair in a road project in Xiangtan County, Xiangtan City. The original road was a cement pavement, which was later overlaid with asphalt, i.e., a new white-to-black pavement conversion. Due to freezing temperatures at the beginning of the year, some sections of the asphalt pavement developed temperature-induced cracks, with crack widths ranging from 3 to 5 mm. The repair structure described in this utility model was used for repair.

[0034] The repair process is as follows:

[0035] 1) Use a high-pressure blower to clean the dust inside the cracks.

[0036] 2) Fill the crack with quartz sand and tamp it with a tamping machine until the sand no longer leaks. Smooth the surface and remove any excess quartz sand from the crack. The quartz sand is clean quartz sand with a particle size of 0.6-1.2mm produced in Yueyang, and the average amount used is 65g / m.

[0037] 3) Pour epoxy structural adhesive into the crack every 20 minutes, repeating 3 times until the quartz sand is saturated with it; the average dosage is 35g / m; wait for the epoxy structural adhesive to solidify; after drilling core samples at the crack location using a drilling rig, the compressive strength of the samples was measured to be 40MPa, the splitting tensile strength to be 6.5MPa, and the flexural strength to be 17MPa; the epoxy structural adhesive was prepared by ourselves after purchasing materials from the market;

[0038] 4) press and paste the joint tape on the surface of the crack (i.e. the surface of the quartz sand and the epoxy structural adhesive), the type is GJ-B10, the width is 6-7 cm, and the thickness is 2 mm;

[0039] 5) apply the type I polyurea waterproof coating on the surface of the joint tape to form a polyurea coating layer, the tensile strength of the type I polyurea waterproof coating is 10.4 MPa, and the elongation at break is 1100%; after the brushing is completed, 60-mesh rubber powder produced by a certain building material limited company in Hebei is sprinkled.

[0040] After the construction is completed, it is found that the repaired structure has no cracking, wear and peeling phenomenon, and the repair effect is good.

[0041] Example 2;

[0042] This example is a case of repairing cracks in an asphalt pavement of a road in Changsha Wangcheng District. The road is a city road, and irregular cracks appear on the pavement, with different widths, depths, etc., the maximum width being 15 mm and the maximum depth being 12 mm. The repairing structure is used for repairing.

[0043] The repairing construction process is as follows:

[0044] 1) dust in the crack is cleaned by using a high-pressure air blower.

[0045] 2) quartz sand is filled into the crack, and a rammer is used to ram and vibrate the quartz sand until the sand particles no longer seep, the surface of the crack is smoothed, and the excess quartz sand on the surface of the crack is removed; the quartz sand is clean quartz sand with a particle size of 0.6-1.2 mm produced by a certain place in Yueyang, and the average amount is 105 g / m;

[0046] 3) the epoxy structural adhesive is poured into the crack every 10 min, and the pouring is performed 3 times until the quartz sand is saturated and adsorbed; the average amount is 57 g / m; the epoxy structural adhesive is obtained by self-preparing after purchasing materials on the market;

[0047] 4) the joint tape is pressed and pasted on the surface of the crack (i.e. the surface of the quartz sand and the epoxy structural adhesive), the type is GJ-B10, the width is 7-8 cm, and the thickness is 2 mm;

[0048] 5) the type I polyurea waterproof coating is applied on the surface of the joint tape to form a polyurea coating layer, the tensile strength of the type I polyurea waterproof coating is 10.4 MPa, and the elongation at break is 1100%; after the brushing is completed, 60-mesh rubber powder produced by a certain building material limited company in Hebei is sprinkled.

[0049] The above description is only used to illustrate the technical scheme of the present application and not to limit it, and the modification or replacement of the technical scheme by other technical personnel in the same field should be covered in the scope of the claims of the present application as long as it does not deviate from the connotation of the technical scheme of the present application.

Claims

1. A structure for repairing cracks in asphalt pavement, characterized in that: The product includes a repair filler layer, a joint sealing tape, a polyurea coating, and rubber powder. The repair filler layer is filled into the cracks in the asphalt pavement using repair filler. The joint sealing tape is applied to the surface of the repair filler layer and the asphalt pavement surface on both sides of the repair filler layer. The polyurea coating is applied to the surface of the joint sealing tape using polyurea paint. The rubber powder is spread on the surface of the polyurea coating.

2. The asphalt pavement crack repair structure according to claim 1, characterized in that: The thickness of the polyurea coating is not less than 0.1 mm, and the width matches the seam sealing tape.

3. The asphalt pavement crack repair structure according to claim 1, characterized in that: The polyurea coating used is a type I polyurea waterproof coating.

4. The asphalt pavement crack repair structure according to claim 1, characterized in that: The rubber powder has a particle size of 40-80 mesh.

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