Preparation method of crack pouring adhesive material for roads in cold regions

Abstract

The invention discloses a preparation method of a crack pouring adhesive material for roads in cold regions. The preparation method comprises the following steps: 1, selecting raw materials for preparing the crack pouring adhesive; 2, selecting preparation equipment; and step 3, processing to obtain an asphalt crack pouring adhesive product. 4, carrying out a colloid performance test on the prepared asphalt crack pouring glue product, and then carrying out an orthogonal test to obtain an optimal grade ratio of the asphalt crack pouring glue; 5, carrying out a pavement performance test on the asphalt crack pouring glue; and 6, according to the pavement performance test content, selecting the crack pouring glue meeting the pavement performance evaluation index as an asphalt crack pouring glue finished product. The performance of the crack pouring adhesive material prepared by the method meets the performance standards of normal-temperature and low-temperature crack pouring adhesives for roads, the failure phenomenon that the crack pouring adhesives flow at high temperature in summer and crack at low temperature in winter after being repaired can be overcome, the service life of the repaired road surface can be prolonged, the later maintenance cost is reduced, and the maintenance cost is reduced. And the road driving safety is ensured.

Description

Technical Field

[0001] The present invention relates to the field of road engineering, and particularly relates to a preparation method of a crack filling glue material for cold region roads. Background Art

[0002] During the use of asphalt pavements, cracks will occur in asphalt pavements due to vehicle traffic, temperature, and environmental factors. If the cracks in the asphalt pavement cannot be effectively repaired in time, the pavement crack diseases will intensify, thus affecting the driving safety of the asphalt pavement. If the crack diseases can be repaired timely and effectively, not only can the influence of more serious diseases on the pavement be reduced, thereby extending the service life of the asphalt pavement and increasing the pavement comfort, but also the maintenance cost of the asphalt pavement can be reduced and the pavement service life can be extended with less funds.

[0003] Filling cracks with heat - type crack filling glue is a common crack repair method. Different types of crack filling glue need to meet performance indicators under different environments. Due to the material of the crack filling glue itself and the degree of influence by the environment, there are failure phenomena such as low service life, low adhesion to the original pavement, and weak anti - aging performance resulting in cracking.

[0004] Existing crack repair materials can be divided into cold - repair materials, hot - repair materials, and special repair materials. Among them, the cold - repair materials have poor effect and high failure rate, and are used in some sections with harsh environments. The special repair materials have high cost and high specificity, and are commonly used for some micro - cracks. Currently, the crack repair materials used are mainly traditional hot asphalt, which is prone to cracking and becoming brittle in winter, flowing at high temperatures in summer, and having a fast failure rate. The developed crack filling glue for cold region roads can improve its adhesion, fluidity, resistance to high and low temperatures, and water stability, thus improving the overall performance of the asphalt crack filling glue. In view of this, the present invention proposes a preparation method of a crack filling glue material for cold region roads. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation method of a crack filling glue material for cold region roads to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A preparation method of a crack filling glue material for cold region roads, the preparation method includes the following steps:

[0007] In the first step, select Karamay No. 90 A matrix asphalt, epoxy resin e - 44, curing agent MOCA, toughening agent, diluent, and phase solvent as raw materials for preparing the crack filling glue.

[0008] In the second step, select a stirrer, an oil bath pan, and a constant - temperature thin - film oven as preparation equipment.

[0009] Step 3: Process the selected raw materials using the selected preparation equipment to produce an asphalt crack sealant product;

[0010] Step 4: For the prepared asphalt crack sealant product, conduct a colloidal property test according to the evaluation indicators, and then obtain the optimal grade ratio of the asphalt crack sealant through an orthogonal test by comparing the performance indicators;

[0011] Step 5: Conduct a road performance test of the asphalt crack sealant according to the road performance evaluation indicators of the asphalt crack sealant and the problems existing in the crack repair materials used on the road;

[0012] Step 6: Select a crack sealant that meets the road performance evaluation indicators as the finished product of the asphalt crack sealant according to the content of the road performance test.

[0013] Preferably, the addition ratio of the Karamay No. 90 A base asphalt to the epoxy resin e-44 is 2:1.

[0014] Preferably, the toughening agent is carboxyl nitrile rubber, the diluent is ethylene glycol monobutyl ether, and the compatibilizer is aromatic oil.

[0015] Preferably, the added mass percentage of the curing agent MOCA is 20% - 35%, the added mass percentage of the phase solvent aromatic oil is 15% - 30%, the added mass percentage of the toughening agent carboxyl nitrile rubber is 10% - 25%, and the added mass percentage of the diluent ethylene glycol monobutyl ether is 10% - 15%.

[0016] Preferably, the preparation method of the asphalt crack sealant product includes the following steps:

[0017] A1: First, put the Karamay No. 90 A base asphalt into a constant temperature thin-film oven and heat it to 140°C until it reaches a flowing state;

[0018] A2: Put the Karamay No. 90 A base asphalt heated to a flowing state into an oil bath at 140°C;

[0019] A3: Add the phase solvent, epoxy resin, toughening agent, and diluent to the oil bath in sequence, and use a stirrer to stir at a speed of 1500 - 1700 r / min for 5 - 10 min each time one is added;

[0020] A4: After raising the temperature of the oil bath to 180°C, add the curing agent and stir at 2300 - 2500 r / min for 10 - 15 min;

[0021] A5: Finally, put the stirred product into a constant temperature thin-film oven at 180°C for swelling and development for 30 - 45 min to obtain the asphalt crack sealant product.

[0022] Preferably, in the fourth step, the content of the evaluation index includes bond strength, temperature resistance, fluidity, anti-aging performance, and low-temperature flexibility.

[0023] Preferably, the bond strength is to evaluate the bonding ability between the crack sealant and the pavement material, which is measured by a tensile test or a shear test;

[0024] The temperature resistance is to measure the performance change of the crack sealant under high and low temperature conditions;

[0025] The fluidity is to measure the fluidity of the crack sealant in the heated state, which is evaluated by a flow test;

[0026] The anti-aging performance is to evaluate the performance change of the crack sealant exposed to environmental factors such as ultraviolet rays, oxygen, and temperature changes;

[0027] The low-temperature flexibility is to test the flexibility of the crack sealant under low-temperature conditions, which is evaluated by a low-temperature bending test.

[0028] Preferably, when conducting the orthogonal test, multiple experimental groups are designed, and each group corresponds to a different formulation combination. First, the performance indexes under different combinations are compared, and then the optimal grading ratio is determined by statistical methods.

[0029] Preferably, the problems existing in the crack repair materials used for highways include high viscosity of the crack sealant, tensile cracking at low temperature, failure of crack regeneration repair, and damage to the bonding interface between the crack sealant and the original pavement.

[0030] Preferably, the road performance test includes the following steps:

[0031] B1, Carry out a rotational viscosity test using the Brookfield viscometer rotational method;

[0032] B2, After heating the crack sealant to 180 - 200 °C, study the change law of viscosity under the constant temperature conditions of 180 °C, 190 °C, and 200 °C;

[0033] B3, Use a tensile testing machine to conduct low-temperature tensile and low-temperature bending creep compliance tests on the asphalt crack sealant at -10 °C, -20 °C, and -30 °C;

[0034] B4, Use a direct bonding force test instrument to test the bonding force of the bionic crack sealant under high and low temperature conditions.

[0035] The technical effects and advantages of the present invention:

[0036] The crack-sealing glue material prepared by the method of the present invention has stronger self-performance for road use in cold regions compared with traditional crack-sealing glue materials. Its self-performance meets the performance standards of both normal-temperature and low-temperature crack-sealing glues for road use, can overcome the failure phenomena of summer high-temperature flow and winter low-temperature cracking after crack-sealing glue repair, and can extend the service life of the road surface and reduce the later maintenance cost after repair, ensuring the driving safety of the road surface. Brief Description of the Drawings

[0037] Figure 1 It is a flowchart of the operation of the preparation method of the present invention. Detailed Embodiments

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] The present invention provides a method for preparing a crack-sealing glue material for cold-region roads as shown in Figure 1 and includes the following steps:

[0040] First step, select Karamay No. 90 A base asphalt, epoxy resin e-44, curing agent MOCA, toughening agent, diluent and compatibilizer as raw materials for preparing the crack-sealing glue. The selection of raw materials is based on the process requirements for crack-sealing glue materials in the "Pavement Heating-Type Sealant" (JT / T 740-2015) standard;

[0041] Specifically, the addition ratio of Karamay No. 90 A base asphalt to epoxy resin e-44 is 2:1. The toughening agent is carboxyl nitrile rubber, the diluent is ethylene glycol monobutyl ether, and the compatibilizer is aromatic oil.

[0042] It should be noted that carboxyl nitrile rubber is used to improve the flexibility, elasticity and crack resistance of asphalt crack-sealing glue, and can improve the low-temperature performance and enhance the adaptability to temperature changes;

[0043] Ethylene glycol monobutyl ether is used to reduce the viscosity of asphalt, improve the construction performance, and can improve the fluidity and permeability of the crack-sealing glue, facilitating the filling of cracks;

[0044] Aromatic oil is used to improve the compatibility between asphalt and rubber, promote the uniform mixing of the two, and can improve the flexibility and durability of the crack-sealing glue.

[0045] Further, the added mass percentage of the curing agent MOCA is 20% - 35%, the added mass percentage of the co-solvent aromatic oil is 15% - 30%, the added mass percentage of the toughening agent carboxy nitrile rubber is 10% - 25%, and the added mass percentage of the diluent ethylene glycol monobutyl ether is 10% - 15%.

[0046] Second step, select a stirrer, an oil bath and a constant temperature film oven as the preparation equipment;

[0047] It should be noted that the oil bath is a heating device, which indirectly heats the sample or reaction vessel through a heating medium oil (including silicone oil and mineral oil). It has the characteristics of precise temperature control, uniform heating and wide application range, and is commonly used in chemical synthesis, material preparation and asphalt performance testing.

[0048] Third step, process the selected raw materials through the selected preparation equipment to obtain an asphalt crack sealant product;

[0049] Specifically, the preparation method of the asphalt crack sealant product includes the following steps:

[0050] A1. First, put the Karamay No. 90 A base asphalt into the constant temperature film oven and heat it to 140°C until it reaches a flowing state;

[0051] A2. Put the Karamay No. 90 A base asphalt heated to a flowing state into an oil bath at 140°C;

[0052] A3. Add the co-solvent, epoxy resin, toughening agent and diluent to the oil bath in sequence, and use a stirrer to stir for 5 - 10 minutes at a rotation speed of 1500 - 1700 r / min each time one is added;

[0053] A4. After raising the temperature of the oil bath to 180°C, add the curing agent and stir for 10 - 15 minutes at 2300 - 2500 r / min;

[0054] A5. Finally, put the stirred product into a constant temperature film oven at 180°C to swell and develop for 30 - 45 minutes to obtain the asphalt crack sealant product.

[0055] Example 1 is shown in Table 1 below;

[0056] Table 1 Orthogonal test design table

[0057]

[0058] The ratio of matrix asphalt to epoxy resin is fixed at 2:1, and the addition amounts of the remaining curing agent MOCA, toughening agent carboxy nitrile rubber, diluent ethylene glycol monobutyl ether, and compatibilizer aromatic oil are designed by orthogonal experiment according to the epoxy resin system. The preparation effect of the crack-sealing glue is closely related to the type of modifier, the dosage of admixture, and the preparation process. A high-speed stirrer, an oil bath, a constant-temperature thin-film oven, etc. are used to prepare the asphalt crack-sealing glue. The Karamay No. 90 A asphalt is heated to a flowing state at 140 °C in the constant-temperature thin-film oven, and then placed in an oil bath at 140 °C. The compatibilizer, epoxy resin, toughening agent, and diluent are added in turn. After adding each additive, it is stirred at a speed of 1500 r / min for 5 min. Finally, the temperature of the oil bath is raised to 180 °C, the curing agent is added, and it is stirred at 2500 r / min for 10 min. Then it is placed in a constant-temperature thin-film oven at 180 °C for swelling and development for 30 minutes to obtain the product of the asphalt crack-sealing glue.

[0059] In the fourth step, for the prepared asphalt crack-sealing glue product, a colloidal property test is carried out according to the evaluation index, and then the best gradation ratio of the asphalt crack-sealing glue is obtained by comparing the performance indexes through orthogonal experiment.

[0060] Specifically, in the fourth step, the content of the evaluation index includes bond strength, temperature resistance, fluidity, anti-aging performance, and low-temperature flexibility.

[0061] Furthermore, the bond strength is to evaluate the bonding ability between the crack-sealing glue and the road surface material, which is measured by a tensile test or a shear test. This index reflects the ability of the crack-sealing glue to resist peeling and falling off during use, and a high bond strength means that the crack-sealing glue can effectively adhere to the road surface and prevent the infiltration of water and impurities.

[0062] The temperature resistance is to measure the performance change of the crack-sealing glue under high and low temperature conditions to ensure that it will not soften or crack under extreme climate conditions.

[0063] The fluidity is to measure the fluidity of the crack-sealing glue in the heated state, which is evaluated by a flow test. Good fluidity ensures that the crack-sealing glue can smoothly fill the cracks.

[0064] The anti-aging performance is to evaluate the performance change of the crack-sealing glue exposed to environmental factors such as ultraviolet rays, oxygen, and temperature changes to ensure that its performance can remain stable during the service life.

[0065] The low-temperature flexibility is to test the flexibility of the crack-sealing glue under low-temperature conditions, which is evaluated by a low-temperature bending test to ensure that it will not crack in cold weather.

[0066] Specifically, when carrying out the orthogonal experiment, multiple experimental groups are designed, and each group corresponds to a different formula combination. First, the performance indexes under different combinations are compared, and then the best gradation ratio is determined by statistical methods.

[0067] It should be noted that the design of the orthogonal experiment is to determine the factors affecting the performance (including the proportions of asphalt, epoxy resin, and curing agent) and the corresponding levels, select the corresponding orthogonal table, arrange the experiments, and refer to the above Example 1. The optimal gradation ratio is shown in Table 2 below;

[0068] Table 2 Optimal Gradation Ratio Table

[0069] Sealant number Curing agent (%) Phase solvent (%) Toughening agent (%) Diluent (%) 1 30 20 25 5

[0070] Fifthly, according to the evaluation indexes of the road performance of the asphalt crack sealant and the problems existing in the crack sealant repair materials used on the road, conduct the road performance test of the asphalt crack sealant;

[0071] Specifically, the problems existing in the crack sealant repair materials used on the road include high viscosity of the crack sealant, tensile cracking at low temperature, failure of crack regeneration repair, and damage to the bonding interface between the crack sealant and the original road surface.

[0072] Specifically, the road performance test includes the following steps:

[0073] B1. Carry out the rotational viscosity test by the Brookfield viscometer rotation method;

[0074] It should be noted that the experiment includes the following steps:

[0075] B101. Equipment preparation, ensure that the Brookfield viscometer is in good working condition and calibrate the instrument;

[0076] B102. Sample preparation, heat the asphalt crack sealant sample to a flowing state and ensure that the sample is uniform and bubble-free;

[0077] B103. Test conditions, set the rotation speed and temperature, and record the viscosity values at different rotation speeds.

[0078] B104. Data recording, record the viscosity data at different temperatures and rotation speeds, and analyze the variation law of viscosity with temperature and rotation speed.

[0079] B2. After heating the crack sealant to 180 - 200 °C, study the variation law of viscosity under the constant temperature conditions of 180 °C, 190 °C, and 200 °C;

[0080] It should be noted that the operation steps of B2 include:

[0081] B201. Heat the sample, heat the crack sealant to 180 - 200 °C and ensure that the temperature is uniform;

[0082] B202. Constant temperature control, conduct tests under the constant temperature conditions of 180 °C, 190 °C, and 200 °C respectively;

[0083] B203, Viscosity measurement, measure the viscosity at various temperatures using a Brookfield viscometer;

[0084] B204, Data analysis, record and analyze the variation trend of viscosity with temperature, and plot the viscosity-temperature curve.

[0085] B3, Conduct low-temperature tensile and low-temperature bending creep compliance tests on the asphalt joint sealant at -10°C, -20°C, and -30°C using a tensile testing machine;

[0086] It should be noted that the operation steps of B3 include:

[0087] B301, Sample preparation, prepare asphalt joint sealant specimens with standard dimensions;

[0088] B302, Test conditions, conduct low-temperature tensile and low-temperature bending creep compliance tests at -10°C, -20°C, and -30°C;

[0089] B303, Tensile test, measure the tensile strength and elongation at break of the specimen using a tensile testing machine;

[0090] B304, Bending test, conduct a low-temperature bending test, and record the bending performance and creep compliance behavior of the specimen;

[0091] B305, Data recording, record the tensile and bending data at various temperatures, and analyze the low-temperature performance.

[0092] B4, Test the bonding strength of the bionic joint sealant under high and low temperature conditions using a direct bonding strength test instrument.

[0093] It should be noted that the operation steps of B4 include:

[0094] B401, Sample preparation, prepare bionic joint sealant specimens to ensure the surface is clean and pollution-free;

[0095] B402, Test conditions, conduct bonding strength tests under high and low temperature conditions (such as 60°C at high temperature and -20°C at low temperature);

[0096] B403, Bonding strength measurement, measure the bonding strength of the specimen using a direct bonding strength test instrument;

[0097] B404, Data recording, record the bonding strength data at different temperatures, and analyze the variation law of the bonding strength with temperature.

[0098] Sixth step, according to the content of the road performance test, select the joint sealant that meets the road performance evaluation indicators as the finished asphalt joint sealant.

[0099] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation method of a crack filling adhesive material for cold region roads, characterized in that, The preparation method includes the following steps: First step, select Karamay No. 90 A matrix asphalt, epoxy resin e-44, curing agent MOCA, toughening agent, diluent and compatibilizer as raw materials for preparing the crack sealant; Second step, select a stirrer, an oil bath and a thermostatic thin-film oven as preparation equipment; Third step, process the selected raw materials through the selected preparation equipment to obtain an asphalt crack sealant product; Fourth step, for the prepared asphalt crack sealant product, conduct a colloidal property test according to the evaluation indexes, and then obtain the optimal gradation ratio of the asphalt crack sealant through an orthogonal test by comparing the performance indexes; Fifth step, according to the road performance evaluation indexes of the asphalt crack sealant and the problems existing in the crack repair materials used on the road, conduct a road performance test on the asphalt crack sealant; Sixth step, according to the content of the road performance test, select the crack sealant that meets the road performance evaluation indexes as the finished asphalt crack sealant.

2. The preparation method of a crack filling glue material for cold region roads according to claim 1, characterized in that The addition ratio of the Karamay No. 90 A matrix asphalt to the epoxy resin e-44 is 2:

1.

3. A preparation method of a crack filling adhesive material for cold region roads according to claim 1, characterized in that, The toughening agent is carboxyl nitrile rubber, the diluent is ethylene glycol monobutyl ether, and the compatibilizer is aromatic oil.

4. A method for preparing a crack filling adhesive material for cold region roads according to claim 3, characterized in that, The added mass percentage of the curing agent MOCA is 20% - 35%, the added mass percentage of the compatibilizer aromatic oil is 15% - 30%, the added mass percentage of the toughening agent carboxyl nitrile rubber is 10% - 25%, and the added mass percentage of the diluent ethylene glycol monobutyl ether is 10% - 15%.

5. A preparation method of a crack-sealing glue material for cold-region roads according to claim 1, characterized in that, The preparation method of the asphalt crack sealant product includes the following operations: A1, first put the Karamay No. 90 A matrix asphalt into the thermostatic thin-film oven and heat it to 140°C until it reaches a flowing state; A2, put the Karamay No. 90 A matrix asphalt heated to a flowing state into an oil bath at 140°C; A3, add the compatibilizer, epoxy resin, toughening agent and diluent to the oil bath in sequence, and use a stirrer to stir at a speed of 1500 - 1700 r / min for 5 - 10 min each time one is added; A4, after raising the temperature of the oil bath to 180°C, add the curing agent and stir at 2300 - 2500 r / min for 10 - 15 min; A5, finally put the stirred product into a thermostatic thin-film oven at 180°C for swelling and development for 30 - 45 min to obtain the asphalt crack sealant product.

6. The preparation method of a crack filling glue material for cold region roads according to claim 1, characterized in that, In the fourth step, the content of the evaluation indexes includes bond strength, temperature resistance, fluidity, anti-aging performance and low-temperature flexibility.

7. The preparation method of a crack filling glue material for cold region roads according to claim 6, characterized in that, The bond strength is to evaluate the bonding ability between the crack sealant and the road surface material, and is measured by a tensile test or a shear test; The temperature resistance is to measure the performance change of the crack sealant under high-temperature and low-temperature conditions; The fluidity is to measure the fluidity of the crack sealant in the heated state and is evaluated by a flow test; The anti-aging performance is to evaluate the performance change of the crack sealant exposed to environmental factors such as ultraviolet rays, oxygen and temperature changes; The low-temperature flexibility is to test the flexibility of the crack sealant under low-temperature conditions and is evaluated by a low-temperature bending test.

8. A preparation method of a crack-sealing glue material for cold-region roads according to claim 1, characterized in that, When the orthogonal experiment is carried out, multiple experimental groups are designed, and each group corresponds to a different formula combination. First, the performance indexes under different combinations are compared, and then the optimal gradation ratio is determined by statistical methods.

9. A preparation method of a crack filling adhesive material for cold region roads according to claim 1, characterized in that, The problems existing in the crack-sealing repair materials used for the road include high viscosity of the crack-sealing glue, tensile cracking at low temperature, failure of crack regeneration repair, and damage to the bonding interface between the crack-sealing glue and the original road surface.

10. The preparation method of a crack filling adhesive material for cold region roads according to claim 1, characterized in that, The road performance test includes the following steps: B1. Carry out the rotational viscosity test by the Brookfield viscometer rotation method; B2. After heating the crack-sealing glue to 180-200 °C, study the change law of viscosity under the constant temperature conditions of 180 °C, 190 °C and 200 °C; B3. Use a tensile testing machine to carry out low-temperature tensile and low-temperature bending creep compliance tests on the asphalt crack-sealing glue under the conditions of -10 °C, -20 °C and -30 °C; B4. Use a direct bonding force test instrument to test the bonding force of the bionic crack-sealing glue under high and low temperature conditions.

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