Asphalt pavement patching material and preparation method thereof

Abstract

The invention provides an asphalt pavement patching material and a preparation method thereof, and belongs to the technical field of pavement patching. The asphalt pavement patching material comprises 60-70 parts of heavy traffic asphalt, 10-15 parts of an SBS modifier, 5-10 parts of butadiene styrene rubber powder, 3-6 parts of polyphosphoric acid, 4-8 parts of a plasticizer, 5-10 parts of fly ash and 5-10 parts of fine aggregate. According to the asphalt pavement patching material disclosed by the invention, the durability of the patching material is improved by adding the SBS modifier and the styrene butadiene rubber powder; by adding the polyphosphoric acid and the plasticizer, the viscosity of the asphalt pavement patching material is improved, so that the patching material can be tightly combined with an original pavement; by adding the fly ash and the fine aggregate, the compactness of the repairing material is improved, and the waterproofness of the repairing material is enhanced. The asphalt pavement patching material obtained by the invention has high water resistance, cohesiveness and durability, and the service life of a road is prolonged to a greater extent.

Description

Technical Field

[0001] The invention relates to the technical field of road surface repair, and in particular to an asphalt road surface repair material and a preparation method thereof. Background Art

[0002] Asphalt pavement cracking during service is a common problem in countries around the world, regardless of whether the base is flexible or semi-rigid. The harm of pavement cracks is that water continues to enter through the cracks, causing the base and even the roadbed to soften, resulting in a decrease in the pavement's bearing capacity, and causing problems such as pumping, steps, and cracks, thereby accelerating pavement damage. The main causes of asphalt pavement cracking can be divided into two categories: one is structural damage cracks caused by the action of vehicle loads, generally referred to as load-type cracks. The other is mainly temperature cracks caused by changes in the temperature of the asphalt surface layer, including low-temperature shrinkage cracks and fatigue cracks, generally referred to as non-load-type cracks. Asphalt pavement cracks need to be repaired in a timely manner. If they are not repaired in time, they will continue to deteriorate under the repeated action of vehicle loads, seriously affecting driving comfort and the service life of the road.

[0003] There are two main methods for repairing cracks: hot patching and cold patching. Cold patching materials include different types such as joint tape, room temperature sealant, and asphalt cold patching materials, while hot patching materials include different types such as heating sealant and asphalt hot material. The cold patching method has the advantages of fast construction speed, simple operation, energy saving and environmental protection. Cold patching asphalt mixtures mainly include three forms: diluted asphalt mixtures, emulsified asphalt mixtures, and reaction resin mixtures. Emulsified asphalt mixtures have poor storage performance and generally cannot be constructed when the temperature is below 5°C or on rainy days. Reaction resin mixtures are expensive, while diluted asphalt mixtures can be stored for a long time and have strong environmental adaptability. They are the main type of cold patching asphalt mixtures in my country. At present, cold patching asphalt pavement repair materials mainly have technical problems such as poor water resistance, poor cohesion, and poor durability.

[0004] Based on this, it is of great practical significance to provide an asphalt pavement repair material with good water resistance, strong cohesion and high durability. Summary of the invention

[0005] The purpose of the present invention is to provide an asphalt pavement repair material with good water resistance, strong cohesion and high durability, aiming to solve the technical problems of poor water resistance, poor cohesion and poor durability of asphalt pavement repair materials in the prior art.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides an asphalt pavement repair material, comprising the following components:

[0008] Heavy traffic asphalt, SBS modifier, styrene-butadiene rubber powder, polyphosphoric acid, plasticizer, fly ash and fine aggregate.

[0009] Furthermore, the mass fractions of the components are respectively:

[0010] 60-70 parts of heavy traffic asphalt, 10-15 parts of SBS modifier, 5-10 parts of styrene-butadiene rubber powder, 3-6 parts of polyphosphoric acid, 4-8 parts of plasticizer, 5-10 parts of fly ash and 5-10 parts of fine aggregate.

[0011] Furthermore, the plasticizer is polyacrylamide.

[0012] Furthermore, the particle size of the fly ash and fine aggregate is 200-300 meshes.

[0013] The present invention also provides a method for preparing the asphalt pavement repair material described in the above technical solution, characterized in that it comprises the following steps:

[0014] The heavy-duty asphalt is heated to obtain melted asphalt;

[0015] Adding SBS modifier and styrene-butadiene rubber powder to the melted asphalt, performing a first mixing, and obtaining a first mixture;

[0016] adding polyphosphoric acid and a plasticizer to the first mixture for second mixing to obtain a second mixture;

[0017] Fly ash and fine aggregate are added to the second mixture for a third mixing to obtain the asphalt pavement repair material.

[0018] Furthermore, the heating temperature is 160-180°C.

[0019] Furthermore, the first mixing time is 30 to 40 minutes, the second mixing time is 10 to 20 minutes, and the third mixing time is 20 to 30 minutes.

[0020] Furthermore, the stirring rates of the first mixing, the second mixing and the third mixing are all 300-500 rpm.

[0021] The present invention also provides the use of the asphalt pavement repair material described in the above technical solution in pavement repair.

[0022] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0023] (1) The present invention uses heavy-duty asphalt as the matrix of the repair material, and by adding SBS modifier, a high molecular weight gel network is formed inside the heavy-duty asphalt, which greatly improves the performance of the asphalt, making the final repair material more durable than ordinary asphalt pavement and having higher durability;

[0024] (2) The present invention also adds styrene butadiene rubber powder, which has the advantages of small particle size, good water resistance, good compatibility, high wear resistance, etc. The present invention makes the final repair material have higher flexibility by adding styrene butadiene rubber powder to the repair material, which can better adapt to thermal expansion and contraction, and reduce the damage and deformation of the road surface; in addition, the styrene butadiene rubber powder further improves the durability of the repair material and extends the service life of the road through the synergistic effect with the SBS modifier;

[0025] (3) The present invention improves the viscosity of the asphalt pavement repair material by adding polyphosphoric acid and plasticizer, so that the repair material can be closely combined with the original pavement, reducing problems such as falling off and delamination caused by poor adhesion;

[0026] (4) Fly ash and fine aggregate are also added to the present invention. The tiny particles of fly ash and fine aggregate can fill the voids and tiny cracks in the repair material, reduce the porosity, and at the same time improve its waterproofness during use, improve the water resistance of the road surface, and thus increase the service life of the road. DETAILED DESCRIPTION

[0027] Asphalt pavement cracking during service is a common problem in countries around the world, regardless of whether the base is flexible or semi-rigid. The harm of pavement cracks is that water continues to enter through the cracks, causing the base and even the roadbed to soften, resulting in a decrease in the pavement's bearing capacity, and causing problems such as pumping, steps, and cracks, thereby accelerating pavement damage. The main causes of asphalt pavement cracking can be divided into two categories: one is structural damage cracks caused by the action of vehicle loads, generally referred to as load-type cracks. The other is mainly temperature cracks caused by changes in the temperature of the asphalt surface layer, including low-temperature shrinkage cracks and fatigue cracks, generally referred to as non-load-type cracks. Asphalt pavement cracks need to be repaired in a timely manner. If they are not repaired in time, they will continue to deteriorate under the repeated action of vehicle loads, seriously affecting driving comfort and the service life of the road.

[0028] There are two main methods for repairing cracks: hot patching and cold patching. Cold patching materials include different types such as joint tape, room temperature sealant, and asphalt cold patching materials, while hot patching materials include different types such as heating sealant and asphalt hot material. The cold patching method has the advantages of fast construction speed, simple operation, energy saving and environmental protection. Cold patching asphalt mixtures mainly include three forms: diluted asphalt mixtures, emulsified asphalt mixtures, and reaction resin mixtures. Emulsified asphalt mixtures have poor storage performance and generally cannot be constructed when the temperature is below 5°C or on rainy days. Reaction resin mixtures are expensive, while diluted asphalt mixtures can be stored for a long time and have strong environmental adaptability. They are the main type of cold patching asphalt mixtures in my country. At present, cold patching asphalt pavement repair materials mainly have technical problems such as poor water resistance, poor cohesion, and poor durability.

[0029] Based on this, it is of great practical significance to provide an asphalt pavement repair material with good water resistance, strong cohesion and high durability.

[0030] The present invention provides an asphalt pavement repair material, comprising the following components:

[0031] Heavy traffic asphalt, SBS modifier, styrene-butadiene rubber powder, polyphosphoric acid, plasticizer, fly ash and fine aggregate.

[0032] In the present invention, the mass proportions of the components are preferably: 60-70 parts of heavy-duty asphalt, 10-15 parts of SBS modifier, 5-10 parts of styrene-butadiene rubber powder, 3-6 parts of polyphosphoric acid, 4-8 parts of plasticizer, 5-10 parts of fly ash and 5-10 parts of fine aggregate; further preferably, 60-75 parts of heavy-duty asphalt, 10-12 parts of SBS modifier, 5-7 parts of styrene-butadiene rubber powder, 3-5 parts of polyphosphoric acid, 4-6 parts of plasticizer, 5-8 parts of fly ash and 5-7 parts of fine aggregate.

[0033] In the present invention, the plasticizer is preferably polyacrylamide.

[0034] In the present invention, the particle size of the fly ash and fine aggregate is preferably 200-300 mesh, and more preferably 200-250 mesh.

[0035] The present invention also provides a method for preparing the asphalt pavement repair material described in the above technical solution, characterized in that it comprises the following steps:

[0036] The heavy-duty asphalt is heated to obtain melted asphalt;

[0037] Adding SBS modifier and styrene-butadiene rubber powder to the melted asphalt, performing a first mixing, and obtaining a first mixture;

[0038] adding polyphosphoric acid and a plasticizer to the first mixture for second mixing to obtain a second mixture;

[0039] Fly ash and fine aggregate are added to the second mixture for a third mixing to obtain the asphalt pavement repair material.

[0040] The heavy-duty asphalt is heated to obtain melted asphalt;

[0041] The present invention does not specifically limit the type of heavy traffic asphalt, and the type can be selected according to the actual application site, and any type familiar to those skilled in the art can be used.

[0042] In the present invention, the heating temperature is preferably 160 to 180°C, more preferably 160 to 170°C.

[0043] Adding SBS modifier and styrene-butadiene rubber powder to the melted asphalt, performing a first mixing, and obtaining a first mixture;

[0044] The present invention uses heavy-duty asphalt as the matrix of the repair material, and forms a high molecular weight gel network inside the heavy-duty asphalt by adding SBS modifier, which greatly improves the performance of the asphalt, making the final repair material more durable than ordinary asphalt pavement and having higher durability;

[0045] The present invention also adds styrene butadiene rubber powder, which has the advantages of small particle size, good water resistance, good compatibility, high wear resistance, etc. The present invention makes the final repair material have higher flexibility by adding styrene butadiene rubber powder to the repair material, can better adapt to thermal expansion and contraction, and reduce the damage and deformation of the road surface; in addition, the styrene butadiene rubber powder further improves the durability of the repair material and extends the service life of the road through the synergistic effect with the SBS modifier.

[0046] adding polyphosphoric acid and a plasticizer to the first mixture for second mixing to obtain a second mixture;

[0047] The present invention improves the viscosity of the asphalt pavement repair material by adding polyphosphoric acid and a plasticizer, so that the repair material can be closely combined with the original pavement, reducing problems such as falling off and delamination caused by poor adhesion.

[0048] In the present invention, the first mixing time is preferably 30 to 40 minutes, more preferably 30 to 35 minutes, the second mixing time is preferably 10 to 20 minutes, more preferably 10 to 15 minutes, and the third mixing time is preferably 20 to 30 minutes, more preferably 20 to 25 minutes.

[0049] In the present invention, the stirring rates of the first mixing, the second mixing and the third mixing are preferably 300 to 500 rpm, and more preferably 300 to 400 rpm.

[0050] Fly ash and fine aggregate are added to the second mixture for a third mixing to obtain the asphalt pavement repair material.

[0051] Fly ash and fine aggregate are also added in the present invention. The tiny particles of fly ash and fine aggregate can fill the voids and tiny cracks in the repair material, reduce the porosity, and at the same time improve its waterproofness during use, improve the water resistance of the road surface, and thus increase the service life of the road.

[0052] The present invention also provides the use of the asphalt pavement repair material described in the above technical solution in pavement repair.

[0053] In the present invention, unless otherwise specified, the required raw materials for preparation are all commercially available products well known to those skilled in the art.

[0054] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0055] Example 1

[0056] (1) heating 60 parts of heavy traffic asphalt to 160° C. to melt and obtain melted asphalt;

[0057] (2) adding 10 parts of SBS modifier and 5 parts of styrene-butadiene rubber powder to the melted asphalt, stirring and mixing, setting the stirring rate to 300 rpm, and mixing for 30 minutes to obtain a first mixture;

[0058] (3) adding 3 parts of polyphosphoric acid and 4 parts of polyacrylamide to the first mixture and stirring and mixing them at a stirring rate of 300 rpm for 10 minutes to obtain a second mixture;

[0059] (4) Add 5 parts of fly ash with a particle size of 200 mesh and 5 parts of fine aggregate to the second mixture for final stirring and mixing. Set the stirring rate to 300 rpm. After mixing for 20 minutes, the asphalt pavement repair material is obtained.

[0060] Example 2

[0061] (1) heating 65 parts of heavy traffic asphalt to 170° C. to melt the asphalt to obtain melted asphalt;

[0062] (2) adding 12 parts of SBS modifier and 7 parts of styrene-butadiene rubber powder to the melted asphalt, stirring and mixing, setting the stirring rate to 400 rpm, and mixing for 35 minutes to obtain a first mixture;

[0063] (3) adding 5 parts of polyphosphoric acid and 6 parts of polyacrylamide to the first mixture, stirring and mixing at a stirring rate of 400 rpm, and mixing for 15 minutes to obtain a second mixture;

[0064] (4) Add 8 parts of fly ash with a particle size of 250 mesh and 7 parts of fine aggregate to the second mixture for final stirring and mixing. Set the stirring rate to 400 rpm. After mixing for 25 minutes, the asphalt pavement repair material is obtained.

[0065] Example 3

[0066] (1) heating 70 parts of heavy traffic asphalt to 180° C. to melt the asphalt to obtain melted asphalt;

[0067] (2) adding 15 parts of SBS modifier and 10 parts of styrene-butadiene rubber powder to the melted asphalt, stirring and mixing, setting the stirring rate to 500 rpm, and mixing for 40 minutes to obtain a first mixture;

[0068] (3) adding 6 parts of polyphosphoric acid and 8 parts of polyacrylamide to the first mixture, stirring and mixing at a stirring rate of 500 rpm, and mixing for 20 minutes to obtain a second mixture;

[0069] (4) Add 10 parts of fly ash with a particle size of 300 mesh and 10 parts of fine aggregate to the second mixture for final stirring and mixing. Set the stirring rate to 500 rpm. After mixing for 30 minutes, the asphalt pavement repair material is obtained.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An asphalt pavement repair material, characterized in that: Includes the following components: Heavy traffic asphalt, SBS modifier, styrene-butadiene rubber powder, polyphosphoric acid, plasticizer, fly ash and fine aggregate.

2. The asphalt pavement repair material according to claim 1, characterized in that: The mass fractions of the components are: 60-70 parts of heavy traffic asphalt, 10-15 parts of SBS modifier, 5-10 parts of styrene-butadiene rubber powder, 3-6 parts of polyphosphoric acid, 4-8 parts of plasticizer, 5-10 parts of fly ash and 5-10 parts of fine aggregate.

3. The asphalt pavement repair material according to claim 1, characterized in that: The plasticizer is polyacrylamide.

4. The asphalt pavement repair material according to claim 1, characterized in that: The particle sizes of the fly ash and fine aggregate are 200-300 meshes.

5. A method for preparing the asphalt pavement repair material according to any one of claims 1 to 4, characterized in that: The following steps are involved: The heavy-duty asphalt is heated to obtain melted asphalt; Adding SBS modifier and styrene-butadiene rubber powder to the melted asphalt, performing a first mixing, and obtaining a first mixture; adding polyphosphoric acid and a plasticizer to the first mixture for second mixing to obtain a second mixture; Fly ash and fine aggregate are added to the second mixture for a third mixing to obtain the asphalt pavement repair material.

6. The method for preparing asphalt pavement repair material according to claim 5, characterized in that: The heating temperature is 160-180°C.

7. The method for preparing asphalt pavement repair material according to claim 5, characterized in that: The first mixing time is 30 to 40 minutes, the second mixing time is 10 to 20 minutes, and the third mixing time is 20 to 30 minutes.

8. The method for preparing asphalt pavement repair material according to claim 5, characterized in that: The stirring rates of the first mixing, the second mixing and the third mixing are all 300-500 rpm.

9. An application of an asphalt pavement repair material in pavement repair, characterized in that: The asphalt pavement repair material is the asphalt pavement repair material according to any one of claims 1 to 4 or the asphalt pavement repair material obtained by the preparation method according to claim 5.