A high performance cold patch asphalt mixture and preparation method thereof

Abstract

The invention discloses a high-performance cold patch asphalt mixture and a preparation method thereof. The raw material components of the high-performance cold patch asphalt mixture include: cold patch liquid and aggregate, the mass dosage of the cold patch liquid is 5.05-5.15% of the mass of the aggregate; the raw material composition of the cold patch liquid includes: 80-83 parts of asphalt, 16-20 parts of diesel, 1-2 parts of linoleic acid, 1-2 parts of hydrogenated rosin stearate polyethylene glycol ester, 5-10 parts of acrylic rosin epoxy resin, 0.05-0.1 parts of aluminum chloride and 1-1.5 parts of SBR latex; the parts are by mass. The present invention achieves mixing at room temperature, does not need to heat aggregates, saves fuel, has no gas emissions, reduces production costs, and improves environmental benefits; the high-performance cold patch asphalt mixture has good adhesion, good water stability, high strength, does not become loose or peel off under the action of vehicle loads, and has a long service life; the construction workability and storage stability of the cold patch material are improved, and there are no special requirements for the operating environment. When repairing potholes, the cold patch material can be directly placed in the pothole and properly rolled.

Description

Technical Field

[0001] The invention relates to a high-performance cold patch asphalt mixture and a preparation method thereof, belonging to the technical field of new road materials. Background Art

[0002] In road maintenance projects, pothole repair is an important part of the work. At present, the commonly used repair methods for asphalt pavement damage are hot mix asphalt mixture repair and asphalt cold patch repair. Hot mix asphalt mixture repair technology is mature, but it needs to be mixed and used immediately. Large construction equipment is usually required on the construction site, which will produce weak joints. In addition, volatile substances that pollute the environment are produced during production. At the same time, it is greatly affected by the environment and climate, and road diseases cannot be repaired in a timely and rapid manner, and traffic cannot be opened in time. Cold patch asphalt mixture, as a new type of pavement repair material, has been widely used in actual projects. Its main features include low production cost, good environmental performance, and little impact of climate on construction.

[0003] However, there are still some problems in the preparation process and performance of cold patch asphalt mixture, such as:

[0004] Expensive: The key technologies of cold patch asphalt materials are mostly patented technologies of foreign manufacturers. Their mature products have excellent performance but are relatively expensive, which is not conducive to their widespread promotion and use.

[0005] Uneven product quality: The quality of cold patch asphalt materials currently available in the domestic market is uneven, and problems such as low strength and poor water resistance are relatively common.

[0006] Difficulty in construction: Asphalt cold patch materials are relatively difficult to construct and need to be constructed in a dry environment. They also have poor adhesion and require the addition of auxiliary materials to achieve better results. In addition, their service life is relatively short. Generally, after one or two months of use, they will crack and become loose, requiring re-repair.

[0007] Short storage time: Generally, the storage time of cold patch asphalt mixture is about 2 months, and it is not stored in large quantities.

[0008] In order to overcome the above technical problems existing in the current cold patch asphalt mixture, the applicant has developed the high-performance cold patch asphalt mixture of the present invention and the preparation method thereof. Summary of the invention

[0009] The present invention provides a high-performance cold patch asphalt mixture and a preparation method thereof, which solves the technical problems of low strength, poor water resistance, short service life and the like of the existing cold patch asphalt mixture, has no special requirements for the operating environment, and prolongs the storage time.

[0010] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0011] A high-performance cold patch asphalt mixture, whose raw material components include: cold patch liquid and aggregate, the mass dosage of the cold patch liquid is 5.05-5.15% of the mass of the aggregate; the raw material composition of the cold patch liquid includes: 80-83 parts of asphalt, 16-20 parts of diesel, 1-2 parts of linoleic acid, 1-2 parts of hydrogenated rosin stearate polyethylene glycol ester, 5-10 parts of acrylic rosin epoxy resin, 0.05-0.1 parts of aluminum chloride and 1-1.5 parts of SBR latex; the parts are by mass.

[0012] This application determines that the optimal oil-stone ratio is 5.1% through indoor mixing in the laboratory.

[0013] The above-mentioned linoleic acid improves the workability of the material and promotes enhanced water resistance.

[0014] The acrylic rosin epoxy resin contains unsaturated double bonds, which are polymerized under the catalytic initiation of aluminum chloride, thereby increasing the adhesion and tightness between materials, improving the elasticity, stability, durability, crack resistance and water resistance of the materials, and improving the overall mechanical properties of the materials; rosin stearic acid polyethylene glycol ester has extremely strong surface activity, and at the same time, by utilizing the principle of similar compatibility, it can effectively promote the dispersion uniformity of materials and improve the uniformity of material mixing; SBR latex, hydrogenated rosin stearic acid polyethylene glycol ester and acrylic rosin epoxy resin cooperate with each other and promote each other.

[0015] Although cold patch asphalt mixture has been widely used in road repair and maintenance, the cold patch asphalt mixture prepared by the prior art has problems such as poor compactability and easy loosening. These problems not only affect the repair effect, but also may cause hidden dangers to road safety. The present invention adds an appropriate amount of SBR latex, and cooperates with acrylic rosin epoxy resin, etc., which can greatly improve the water stability and strength of the cold patch material, and ensure that it does not loosen or peel off under the action of vehicle load.

[0016] The invention does not need to heat aggregates during the production process, does not pass through an asphalt mixer, does not produce harmful gases, has little impact on the environment, achieves a cold mix effect, and conforms to the concept of sustainable development. Through the invention, the impact on the environment can be further reduced, green, low-carbon, and environmentally friendly road repair and maintenance can be achieved, and sustainable development can be achieved.

[0017] When repairing potholes with common cold patch materials, the potholes need to be cut into rectangles, the potholes need to be dried, and then emulsified asphalt needs to be applied. The steps are cumbersome and not conducive to the rapid repair of highways and urban open traffic. When repairing potholes with the present invention, the cold patch material can be directly put into the potholes and properly rolled, thereby achieving rapid repair.

[0018] The high-performance cold patch asphalt mixture of the present invention can be stored for more than two years in a sealed state and can be stored for a long time.

[0019] The preparation method of the hydrogenated rosin stearic acid polyethylene glycol ester is as follows: stearic acid and polyethylene glycol are mixed in a molar ratio of (0.9-1):1, p-toluenesulfonic acid is added, and esterification reaction is carried out at a temperature of 180-200°C for 2-4 hours to obtain stearic acid polyethylene glycol monoester, and then hydrogenated rosin is added, and the temperature is raised to 240-260°C, and the reaction is carried out for 3-6 hours to obtain hydrogenated rosin stearic acid polyethylene glycol ester. The molar ratio of hydrogenated rosin to polyethylene glycol is (1-1.1):1.

[0020] In order to further improve the dispersion uniformity of the material, the polyethylene glycol is polyethylene glycol 8000.

[0021] The preparation method of the acrylic rosin epoxy resin is as follows: after the acrylic rosin is heated and melted, 1,6-hexanediol diglycidyl ether (C 12 H 24 O5) and potassium hydroxide are reacted at a temperature of 150-170°C for 3-6 hours to obtain an acrylic rosin epoxy resin; wherein the molar ratio of acrylic rosin to 1,6-hexanediol diglycidyl ether is 1:(2-2.1).

[0022] The acrylic rosin is a dibasic acid, which is prepared by the Diels-Alder addition reaction of acrylic acid and rosin.

[0023] In order to further improve the processing performance of the mixture and ensure the mechanical properties and water and weather resistance of the mixture, the above-mentioned asphalt is preferably No. 70 asphalt, and the diesel is preferably No. 0 diesel.

[0024] The preparation method of the above-mentioned cold infusion solution is:

[0025] 1) Heat diesel to 80-90°C, add acrylic rosin epoxy resin and aluminum chloride, keep warm for 3-6 hours, add hydrogenated rosin stearate polyethylene glycol ester and linoleic acid, mix well, and obtain material 1;

[0026] 2) Heat the asphalt to 120-130°C, add material 1 and SBR latex and circulate for 3-4 hours to obtain asphalt cold replenishment liquid.

[0027] In order to further improve the pavement performance of the mixture, the above aggregate composition is: machine-made sand: limestone 3-5mm: limestone 5-10mm=22%:38%:40%.

[0028] More preferably, the content of aggregates below 0.075 mm is less than 1%.

[0029] The preparation method of the high-performance cold patch asphalt mixture is to add the cold patch liquid to the aggregate at a ratio of 5.05-5.15% and mix for 30 seconds, and then pack it into bags for storage or use it directly. The mixing can be done at room temperature, with no special requirements for the operating environment, no need to heat the aggregate, and no waste gas is generated.

[0030] If the temperature is not specified in the present invention, the operation can be carried out at room temperature. % not specified in the present invention is mass percentage; parts not specified in the present invention are mass parts.

[0031] The technologies not mentioned in the present invention are all referred to the prior art.

[0032] The high-performance cold patch asphalt mixture of the present invention has the following beneficial effects:

[0033] 1. The present invention realizes mixing at room temperature, does not need to heat aggregates, saves fuel, has no gas emissions, reduces production costs, and improves environmental benefits;

[0034] 2. The high-performance cold patch asphalt mixture of the present invention has good adhesion, good water stability, high strength, no loosening or peeling under the action of vehicle load, and long service life;

[0035] 3. The present invention significantly improves the construction and workability of cold patch materials, has no special requirements for the operating environment, and can directly put the cold patch materials into the pits and properly roll them when repairing the pits, and can immediately open traffic, alleviating the traffic pressure caused by construction;

[0036] 4. The present invention significantly improves the storage stability of the cold patch material, and the product will not harden if the storage time is greater than 2 years. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is the adhesion test result diagram of different oil-stone ratios;

[0038] Figure 2 This is a test diagram of the water stripping ability of the high-performance cold patch asphalt mixture of the present invention;

[0039] Figure 3 This is a penetration strength test diagram of the high-performance cold patch asphalt mixture of the present invention;

[0040] Figure 4 This is a construction effect diagram of the high-performance cold-patch asphalt mixture of the present invention. DETAILED DESCRIPTION

[0041] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0042] Example 1

[0043] Preparation of Hydrogenated Rosin Stearate Polyethylene Glycol Ester

[0044] After heating and melting 400g of polyethylene glycol 8000 (PEG8000, Changzhou Sijunxin Plastic Co., Ltd.), add 14.23g of stearic acid and 1g of p-toluenesulfonic acid, stir evenly, and heat to 190°C, react for 4h, and the acid value of sampling is 4.8mgKOH / g; add 15.23g of hydrogenated rosin (first grade, Yoshida Chemical, AQ01), heat to 260°C, react for 5h, and the acid value of sampling is 3.2mgKOH / g. Cool and discharge to obtain hydrogenated rosin stearic acid polyethylene glycol ester with a critical micelle concentration of 0.02mmol / L.

[0045] Example 2

[0046] Preparation of Acrylic Rosin Epoxy Resin

[0047] The preparation method of acrylic rosin is as follows: 303g of rosin (special grade, Yoshida Chemical) is crushed, 7g of hydroquinone is added, and the mixture is mixed. Under nitrogen protection, the mixture is heated. When the temperature reaches 230°C, 73g of acrylic acid is added dropwise at a rate of 60 drops / min. After the addition of acrylic acid is completed, the mixture is reacted at 230°C for 4h, and the mixture is evacuated (the vacuum degree is 0.3kPa, and the time is 8min) to obtain acrylic rosin. The obtained material is cooled to 160°C, 500g of 1,6-hexanediol diglycidyl ether and 3.5g of potassium hydroxide are added, and the mixture is reacted at 160°C for 4h. The acid value of the sample is 0.6mgKOH / g to obtain acrylic rosin epoxy resin.

[0048] Example 3

[0049] The preparation method of cold infusion solution is:

[0050] 1) Heat 20 parts of No. 0 diesel to 80°C, add 6 parts of acrylic rosin epoxy resin and 0.06 parts of aluminum chloride, keep warm at 80°C for 4 hours, add hydrogenated rosin stearate polyethylene glycol ester and linoleic acid, mix well, and obtain material 1;

[0051] 2) 82 parts of No. 70 asphalt were heated to 120°C, and material 1 and 1.2 parts of SBR latex (Qiaolong, SBR-40%, solid content 40wt%) were added and circulated for 3 hours to obtain asphalt cold replenishment liquid.

[0052] Example 4

[0053] Preparation of high performance cold patch asphalt mixture

[0054] The aggregate composition is: limestone machine-made sand: limestone 3-5mm: limestone 5-10mm = 22%: 38%: 40%, and the content of aggregates below 0.075mm is less than 1%.

[0055] Asphalt cold patching liquid was added to aggregate at a ratio of 4.9%, 5.1% and 5.3% respectively and mixed for 30 seconds to obtain a mixture with an asphalt-to-aggregate ratio of 4.9%, a mixture with an asphalt-to-aggregate ratio of 5.1% and a mixture with an asphalt-to-aggregate ratio of 5.3%. Adhesion performance test (test reference: JT / T 972-2015) Figure 1 As shown, a is 4.9%, b is 5.1%, c is 5.3%, and the optimal oil-stone ratio is 5.1%.

[0056] Water stripping ability test: take 90 grams of the mixture, add it into a beaker with 900 grams of boiling tap water, stir it at 50 rpm for 2 minutes while the tap water is boiling, pour out the boiling water, add 23°C tap water to cool, and use tweezers to randomly pick up 100 aggregate particles and observe the color of the treated aggregate particles. If the color is light brown or brown, it is judged to be stripped, and if the color is black, it is judged to be not stripped. The number of stripped particles of the mixture with an oil-stone ratio of 5.1% is 0. It can be seen that the mixture obtained in this application has excellent resistance to water stripping.

[0057] The mixture bending test was conducted to simulate the low temperature condition at a test temperature of -10℃, load the small beam specimen, and measure the flexural tensile strength and maximum flexural tensile strain of the cold patch material to evaluate the crack resistance of the mixture at low temperature. The flexural tensile strength of the mixture with an oil-stone ratio of 5.1% is 10.12MPa, and the maximum flexural tensile strain should be 4853με.

[0058] The penetration strength and other tests of the mixture with an asphalt-stone ratio of 5.1% were carried out with reference to JT / T 972-2015. The results are shown in Table 1.

[0059] Table 1

[0060]

[0061] The mixture with an oil-stone ratio of 5.1% can be stored in a sealed state for more than 2 years, and can be constructed under various climatic conditions. The applicable temperature is -30℃~80℃, and there are no special requirements for the environment. When repairing potholes, just put the cold patch material into the potholes and roll it appropriately. Figure 4 The pavement construction effect diagram of the 5.1% mixture is smooth and beautiful. It will not become loose or peel off under the action of vehicle load. It has a long service life and meets road traffic requirements.

Claims

1. A high-performance cold patch asphalt mixture, characterized by: Its raw material components are: cold filling liquid and aggregate, the mass dosage of the cold filling liquid is 5.05-5.15% of the mass of the aggregate; the cold filling liquid is composed of the following raw materials in mass parts: 80-83 parts of asphalt, 16-20 parts of diesel, 1-2 parts of linoleic acid, 1-2 parts of hydrogenated rosin stearate polyethylene glycol ester, 5-10 parts of acrylic rosin epoxy resin, 0.05-0.1 parts of aluminum chloride and 1-1.5 parts of SBR latex; The preparation method of cold infusion solution is: 1) Heat diesel to 80-90°C, add acrylic rosin epoxy resin and aluminum chloride, keep warm for 3-6 hours, add hydrogenated rosin stearate polyethylene glycol ester and linoleic acid, mix well, and obtain material 1; 2) Heat the asphalt to 120-130°C, add material 1 and SBR latex and circulate for 3-4 hours to obtain asphalt cold make-up liquid; The preparation method of hydrogenated rosin stearic acid polyethylene glycol ester is as follows: stearic acid and polyethylene glycol are mixed in a molar ratio of (0.9-1):1, p-toluenesulfonic acid is added, and an esterification reaction is carried out at a temperature of 180-200°C for 2-4 hours, and then hydrogenated rosin is added, and the temperature is raised to 240-260°C, and the reaction is carried out for 3-6 hours to obtain hydrogenated rosin stearic acid polyethylene glycol ester, and the molar ratio of hydrogenated rosin to polyethylene glycol is (1-1.1):

1.

2. The high performance cold patch asphalt mixture according to claim 1, characterized in that: The polyethylene glycol was polyethylene glycol 8000.

3. The high performance cold patch asphalt mixture according to claim 1 or 2, characterized in that: The preparation method of acrylic rosin epoxy resin is as follows: after heating and melting acrylic rosin, 1,6-hexanediol diglycidyl ether and potassium hydroxide are added at a temperature of 150-170°C, and reacted for 3-6 hours to obtain acrylic rosin epoxy resin; wherein the molar ratio of acrylic rosin to 1,6-hexanediol diglycidyl ether is 1: (2-2.1).

4. The high performance cold patch asphalt mixture according to claim 1 or 2, characterized in that: The asphalt is No. 70 asphalt.

5. The high performance cold patch asphalt mixture according to claim 1 or 2, characterized in that: The diesel is No. 0 diesel.

6. The high performance cold patch asphalt mixture according to claim 1 or 2, characterized in that: The mass content of aggregates below 0.075 mm is less than 1%.

7. A method for preparing a high-performance cold patch asphalt mixture according to any one of claims 1 to 6, characterized in that: Add the cold patch liquid to the aggregate at a ratio of 5.05-5.15% of the mass of the aggregate and mix for 30 seconds to obtain a high-performance cold patch asphalt mixture.

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