A quick road surface anti-cracking repair material and its preparation method

Abstract

The present invention discloses a rapid road pavement crack-resistant repair material and a preparation method thereof, belonging to the technical field of pavement repair. The rapid road pavement crack-resistant repair material comprises the following components in parts by weight: 5-10 parts of asphalt, 10-20 parts of crushed stone, 30-50 parts of quartz sand, 30-50 parts of a composite crack-resistant filler, and 10-20 parts of mineral powder. The present invention uses asphalt, crushed stone, quartz sand, mineral powder, and a composite crack-resistant filler. The present invention utilizes the bonding effect of the composite crack-resistant filler and the filling effect of the powder material to further improve the structural density of the rapid road pavement crack-resistant repair material, thereby improving the low-temperature crack resistance, high-temperature stability, mechanical strength, and bonding effect of the rapid road pavement crack-resistant repair material.

Description

Technical Field

[0001] The present invention relates to the technical field of pavement repair, and particularly relates to a rapid road pavement crack-resistant repair material and a preparation method thereof. Background Art

[0002] With the rapid development of China's economy, highway construction has also entered a period of rapid development. As an important traffic artery, the pavement quality of expressways has an important impact on the safety and service life of road traffic. With the increase of vehicle loads and the increase of the service life of expressways, the damage of expressways is serious. Cracks are one of the main diseases of expressways. Due to the existence of cracks, the strength and durability of the pavement are seriously reduced, the flatness index is reduced, affecting driving comfort, seriously affecting traffic safety, and unable to ensure the normal use and safe operation of expressways.

[0003] Chinese Patent Document CN115716725A discloses a crack-resistant asphalt mixture and a preparation method thereof, belonging to the technical field of road engineering. The mixture includes, by weight: 7-10 parts of matrix asphalt, 60-70 parts of coarse aggregate, 25-35 parts of fine aggregate, 4.5-6 parts of anti-seepage fiber filler, 3-5 parts of strengthening node filler, 5-8 parts of mineral powder, and 2-3 parts of asphalt oil. Among them, the anti-seepage fiber filler and the strengthening node filler are compounded to form an interactive network structure with certain elasticity and water absorption and expansion performance in the pavement after paving, resisting pavement deformation and cracking. At the same time, the water absorption and expansion fills the pavement voids, avoiding the generation of dynamic water pressure and pumping slurry due to water infiltration into the pavement, and preventing the severe deterioration of the pavement after the initial aging cracks occur; there is a poor compatibility between the anti-seepage fiber filler and the asphalt matrix in this invention, resulting in room for further improvement in its crack-resistant performance. Summary of the Invention

[0004] The main object of the present invention is to propose a rapid road pavement crack-resistant repair material with good crack-resistant performance.

[0005] To achieve the above object, the present invention proposes a rapid road pavement crack-resistant repair material, which includes the following components in parts by weight: 5-10 parts of asphalt, 10-20 parts of crushed stone, 30-50 parts of quartz sand, 30-50 parts of composite crack-resistant filler, and 10-20 parts of mineral powder.

[0006] Preferably, the particle size of the crushed stone is 10-30 mm.

[0007] Preferably, the preparation method of the composite crack-resistant filler is as follows:

[0008] 1) Under an Ar2 atmosphere, ε-caprolactone and pentaerythritol are mixed, and then ring-opening polymerization reaction occurs under the catalysis of a catalyst to generate hydroxyl-terminated polycaprolactone;

[0009] 2) Mix the hydroxyl-terminated polycaprolactone, crotonic anhydride, and toluene, and then heat and react under acidic conditions. After the reaction is completed, immerse the glass fiber in the reaction solution. After the immersion is completed, take out the glass fiber and dry it to obtain polycaprolactone-coated glass fiber;

[0010] 3) Mix the bisphenol A epoxy vinyl ester resin and the polycaprolactone-coated glass fiber, and then heat and stir evenly to obtain a mixture. After the temperature of the mixture cools down, add ethylenediamine and azobisisobutyronitrile to the mixture, stir evenly, and then perform vacuum degassing treatment and curing to obtain the composite crack-resistant filler.

[0011] Preferably, the catalyst in step 1) is stannous octoate.

[0012] Preferably, the mass ratio of ε-caprolactone to pentaerythritol in step 1) is 70-90:1.

[0013] Preferably, the mass ratio of the hydroxyl-terminated polycaprolactone, crotonic anhydride, and glass fiber in step 2) is 100:8-10:5-8; the heating temperature is 60-80 °C, and the reaction time is 2-4 h.

[0014] The preparation of the polycaprolactone-coated glass fiber is as follows: first, ε-caprolactone undergoes ring-opening polymerization to generate hydroxyl-terminated polycaprolactone, then the hydroxyl-terminated polycaprolactone reacts with crotonic anhydride under acidic conditions to obtain polycaprolactone containing carbon-carbon double bonds, and then the glass fiber is immersed in the polycaprolactone solution containing carbon-carbon double bonds, so that the polycaprolactone solution containing carbon-carbon double bonds can be coated on the surface of the glass fiber. On the one hand, it is beneficial to the subsequent reaction, and on the other hand, the elastomeric polycaprolactone can cooperate with the glass fiber to improve the toughness of the composite crack-resistant filler, thereby improving the crack-resistant performance of the rapid road pavement crack repair material.

[0015] Preferably, the mass ratio of the epoxy vinyl ester resin, polycaprolactone-coated glass fiber, ethylenediamine, and azobisisobutyronitrile in step 3) is 60-80:10-15:10-20:2-4; the vacuum degassing treatment conditions are a vacuum degree of -0.01 to -0.09 MPa, and the degassing time is 3-5 min.

[0016] Preferably, the curing temperature is 60-100 °C.

[0017] Bisphenol A epoxy vinyl ester resin is an adhesive with good corrosion resistance. The two ends of its molecular chain are active carbon-carbon double bonds. Under the action of azobisisobutyronitrile, it undergoes an addition reaction with polycaprolactone-coated glass fiber, and the polycaprolactone-coated glass fiber is introduced into the structure of bisphenol A epoxy vinyl ester resin through a chemical reaction, which is beneficial to improving the mechanical properties of bisphenol A epoxy vinyl ester resin; due to the good adhesion of bisphenol A epoxy vinyl ester resin, the polycaprolactone-coated glass fiber can be better dispersed and filled in the anti-cracking repair material for expressway pavement, so that when the anti-cracking repair material for expressway pavement is crushed by vehicles, the fracture risk can be significantly reduced, the probability of the expressway pavement generating cracks again is reduced, and thus the durability of the expressway is improved.

[0018] Preferably, the particle size of the mineral powder is 0.2 - 1 mm.

[0019] The present invention also discloses a preparation method of the above anti-cracking repair material for expressway pavement, which includes the following steps: weighing each component according to the formula, heating and stirring asphalt and the composite anti-cracking filler to obtain a slurry, and adding crushed stone, quartz sand, and mineral powder to the slurry, and stirring and mixing evenly to obtain the anti-cracking repair material for expressway pavement.

[0020] Preferably, the heating temperature is 120 - 150 °C, and the stirring time is 3 - 5 h.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] (1) The present invention uses asphalt, crushed stone, quartz sand, mineral powder, and composite anti-cracking filler. By utilizing the bonding effect of the composite anti-cracking filler and the filling effect of the powder material, the structural density of the anti-cracking repair material for expressway pavement is further improved, thereby improving the low-temperature anti-cracking property, high-temperature stability, mechanical strength, and bonding effect of the anti-cracking repair material for expressway pavement;

[0023] (2) The composite anti-cracking fiber of the present invention introduces polycaprolactone-coated glass fiber into the structure of bisphenol A epoxy vinyl ester resin through a chemical reaction, which is beneficial to improving the mechanical properties of bisphenol A epoxy vinyl ester resin; due to the good adhesion of bisphenol A epoxy vinyl ester resin, the polycaprolactone-coated glass fiber can be better dispersed and filled in the anti-cracking repair material for expressway pavement, improving the structural density of the anti-cracking repair material for expressway pavement, so that when the anti-cracking repair material for expressway pavement is crushed by vehicles, the fracture risk can be significantly reduced, the probability of the expressway pavement generating cracks again is reduced, and thus the durability of the expressway is improved. Specific Embodiments

[0024] To avoid unnecessary repetition, unless otherwise specified, the items used in the following examples are all commercially available products, and the methods used are all conventional methods unless otherwise specified.

[0025] The sources of some raw materials used in the present invention are as follows:

[0026] Asphalt, softening point 75.3°C, ductility at 5°C 32.5 cm, ductility at 15°C 100 cm, penetration 52.3 mm, model 10#, Shenzhen Zhongheng Asphalt Engineering Co., Ltd.

[0027] Bisphenol A epoxy vinyl ester resin, grade DM411-350, purchased from Shandong Deshang Chemical Co., Ltd.

[0028] Example 1

[0029] A preparation method of a crack-resistant repair material for expressway pavement includes the following steps: Mix 80 g of asphalt and 400 g of composite crack-resistant filler, and stir at 140°C for 4 h to obtain a slurry. Add 150 g of crushed stone, 400 g of quartz sand, and 150 g of mineral powder to the slurry, and stir and mix evenly to obtain the crack-resistant repair material for expressway pavement.

[0030] The preparation method of the composite crack-resistant filler is as follows:

[0031] 1) Under an Ar2 atmosphere, mix 160 g of ε-caprolactone and 2 g of pentaerythritol, heat to 80°C, add 1.6 g of stannous octoate, and react for 24 h; after the reaction is completed, cool to 30°C, filter, dissolve the solid in 800 mL of dichloromethane, and add 800 mL of anhydrous methanol; after stirring for 20 - 30 min, filter, and collect the solid and dry to obtain hydroxyl-terminated polycaprolactone;

[0032] 2) Mix 100 g of hydroxyl-terminated polycaprolactone, 8.8 g of crotonic anhydride, 500 mL of toluene, and 2 g of p-toluenesulfonic acid, and heat and react at 70°C for 3 h. After the reaction ends, immerse 30 g of glass fiber in the reaction solution. After the immersion is completed, the immersion time is 5 h. Take out the glass fiber and dry to obtain polycaprolactone-coated glass fiber;

[0033] 3) Mix 70 g of bisphenol A epoxy vinyl ester resin and 13.5 g of polycaprolactone-coated glass fiber, and stir evenly at 60°C to obtain a mixture; when the temperature of the mixture cools to 30°C, add 15 g of ethylenediamine and 3 g of azobisisobutyronitrile to the mixture, stir and mix evenly, and then perform vacuum degassing treatment at -0.05 MPa for 4 min and cure at 80°C to obtain the composite crack-resistant filler.

[0034] Example 2

[0035] A preparation method of a crack-resistant repair material for expressway pavement, comprising the following steps: Mix 50 g of asphalt and 300 g of composite crack-resistant filler, and stir at 120 °C for 3 h to obtain a slurry. Add 100 g of crushed stone, 300 g of quartz sand, and 100 g of mineral powder to the slurry, and stir and mix evenly to obtain the crack-resistant repair material for expressway pavement.

[0036] The preparation method of the composite crack-resistant filler is as follows:

[0037] 1) Under an Ar2 atmosphere, mix 140 g of ε-caprolactone and 2 g of pentaerythritol, heat to 60 °C, add 1.4 g of stannous octoate, and react for 20 h; after the reaction is completed, cool to 30 °C, filter, dissolve the solid in 500 mL of dichloromethane, and add 1000 mL of anhydrous methanol; after stirring for 20 min, filter, collect the solid and dry to obtain hydroxyl-terminated polycaprolactone;

[0038] 2) Mix 100 g of hydroxyl-terminated polycaprolactone, 8 g of crotonic anhydride, 500 mL of toluene, and 2 g of p-toluenesulfonic acid, and heat and react at 60 °C for 2 h. After the reaction is completed, immerse 30 g of glass fiber in the reaction solution for 5 h. After the immersion is completed, take out the glass fiber and dry to obtain polycaprolactone-coated glass fiber;

[0039] 3) Mix 60 g of bisphenol A epoxy vinyl ester resin and 10 g of polycaprolactone-coated glass fiber, and stir evenly at 50 °C to obtain a mixture; when the temperature of the mixture cools to 30 °C, add 10.2 g of ethylenediamine and 2.1 g of azobisisobutyronitrile to the mixture, stir evenly, and perform vacuum degassing treatment at -0.01 MPa for 5 min and cure at 60 °C to obtain the composite crack-resistant filler.

[0040] Example 3

[0041] A preparation method of a crack-resistant repair material for expressway pavement, comprising the following steps: Mix 100 g of asphalt and 500 g of composite crack-resistant filler, and stir at 150 °C for 5 h to obtain a slurry. Add 200 g of crushed stone, 500 g of quartz sand, and 200 g of mineral powder to the slurry, and stir and mix evenly to obtain the crack-resistant repair material for expressway pavement.

[0042] The preparation method of the composite crack-resistant filler is as follows:

[0043] 1) Under an Ar2 atmosphere, mix 180 g of ε-caprolactone and 2 g of pentaerythritol, heat to 100 °C, add 1.8 g of stannous octoate, and react for 24 h; cool to 30 °C, filter, dissolve the solid in 1000 mL of dichloromethane, and add 1000 mL of anhydrous methanol, stir for 30 min, filter, collect the solid and dry to obtain hydroxyl-terminated polycaprolactone;

[0044] 2) Mix 100 g of hydroxyl-terminated polycaprolactone, 10 g of crotonic anhydride, 500 mL of toluene, and 2.2 g of p-toluenesulfonic acid, and then heat the mixture at 80 °C for 4 h. After the reaction is completed, immerse 30 g of glass fiber in the reaction solution for 5 h. After the immersion is completed, take out the glass fiber and dry it to obtain polycaprolactone-coated glass fiber;

[0045] 3) Mix 80 g of bisphenol A epoxy vinyl ester resin and 15 g of polycaprolactone-coated glass fiber and stir evenly at 70 °C to obtain a mixture. When the temperature of the mixture cools to 30 °C, add 20 g of ethylenediamine and 4 g of azobisisobutyronitrile to the mixture, stir evenly, and then perform vacuum degassing treatment at -0.09 MPa for 3 min and cure at 100 °C to obtain the composite crack-resistant filler.

[0046] Comparative Example 1

[0047] A preparation method of a crack-resistant repair material for expressway pavement, which is similar to Example 1, except that the composite crack-resistant filler is polycaprolactone-coated glass fiber, and the specific steps are as follows: Mix 80 g of asphalt and 400 g of composite crack-resistant filler at 140 °C and stir for 4 h to obtain a slurry. Add 150 crushed stones, 400 quartz sands, and 150 g of mineral powder to the slurry, and stir and mix evenly to obtain the crack-resistant repair material for expressway pavement.

[0048] The preparation method of the composite crack-resistant filler is as follows:

[0049] 1) Under an Ar2 atmosphere, mix 160 g of ε-caprolactone and 2 g of pentaerythritol, heat to 80 °C, add 1.6 g of stannous octoate, and react for 24 h. After the reaction is completed, cool to 30 °C, filter, dissolve the solid in 800 mL of dichloromethane, and add 800 mL of anhydrous methanol. After stirring for 20 - 30 min, filter and collect the solid and dry it to obtain hydroxyl-terminated polycaprolactone;

[0050] 2) Mix 100 g of hydroxyl-terminated polycaprolactone, 8.8 g of crotonic anhydride, 500 mL of toluene, and 2 g of p-toluenesulfonic acid, and then heat the mixture at 70 °C for 3 h. After the reaction is completed, immerse 30 g of glass fiber in the reaction solution. After the immersion is completed, the immersion time is 5 h. Take out the glass fiber and dry it to obtain polycaprolactone-coated glass fiber, which is the composite crack-resistant filler.

[0051] Comparative Example 2

[0052] A preparation method of a crack-resistant repair material for expressway pavement, which is similar to Example 1, except that the composite crack-resistant filler is a mixture of bisphenol A epoxy vinyl ester resin and glass fiber, and specifically includes the following steps: Mix 80 g of asphalt and 400 g of composite crack-resistant filler, and stir at 140 °C for 4 h to obtain a slurry. Add 150 crushed stones, 400 quartz sands, and 150 g of mineral powder to the slurry, and stir and mix evenly to obtain the crack-resistant repair material for expressway pavement.

[0053] The preparation method of the composite crack-resistant filler is as follows:

[0054] Mix 70 g of bisphenol A epoxy vinyl ester resin and 13.5 g of glass fiber, and stir evenly at 60 °C to obtain a mixture; when the temperature of the mixture cools to 30 °C, add 15 g of ethylenediamine and 3 g of azobisisobutyronitrile to the mixture, stir and mix evenly, and then perform vacuum degassing treatment at -0.05 MPa for 4 min and cure at 80 °C to obtain the composite crack-resistant filler.

[0055] Performance test

[0056] Freeze-thaw splitting test: The test objects are the crack-resistant repair materials for expressway pavement prepared in Examples 1-3 and Comparative Examples 1-2. Refer to the freeze-thaw splitting test of asphalt mixture T0729-2000 in the Technical Specification for Permeable Asphalt Pavement CJJ / T 190-2012 and the Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering JTG E20-2011 to detect the freeze-thaw splitting strength of the crack-resistant repair material and record the data; the freeze-thaw splitting test characterizes the low-temperature crack resistance of the crack-resistant repair material; the test results are shown in Table 1:

[0057] Kentucky flyover test: The test objects are the crack-resistant repair materials for expressway pavement prepared in Examples 1-3 and Comparative Examples 1-2. Refer to the Kentucky flyover test of asphalt mixture T0733-2011 in the Technical Specification for Permeable Asphalt Pavement CJJ / T 190-2012 and the Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering JTG E20-2011. Conduct the Kentucky flyover test on the formed Marshall specimens (compacted 50 times on each side), and record the flyover rate data; the Kentucky flyover test is used to detect the degree of aggregate shedding and loss on the road surface under the action of traffic load of the crack-resistant repair material for expressway pavement, and characterizes the mechanical strength and bonding effect of the crack-resistant repair material for expressway pavement; the test results are shown in Table 1:

[0058] Wheel rut test: The test objects were the rapid road pavement crack-resistant repair materials prepared in Examples 1-3 and Comparative Examples 1-2. Referring to the asphalt mixture wheel rut test in CJJ / T 190-2012 "Technical Specification for Permeable Asphalt Pavement" and JTG E20-2011 "Test Procedures for Bitumen and Bituminous Mixtures in Highway Engineering", the wheel rut test was carried out at 60 °C and 0.7 MPa, and the dynamic stability data was recorded; the high-temperature stability of the crack-resistant repair material was characterized; the test results are shown in Table 1:

[0059] Table 1 Performance test results of rapid road pavement crack-resistant repair materials

[0060]

[0061] It can be seen from the experimental results in Table 1 that the rapid road pavement crack-resistant repair material prepared by the present invention has good low-temperature crack resistance, high-temperature stability, mechanical strength and bonding effect.

[0062] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims

1. A rapid road pavement crack resistance repair material, characterized in that, Comprising the following components by weight parts: 5 - 10 parts of asphalt, 10 - 20 parts of crushed stone, 30 - 50 parts of quartz sand, 30 - 50 parts of composite crack - resistant filler, 10 - 20 parts of mineral powder; The preparation method of the composite crack - resistant filler is as follows: 1) Under an Ar₂ atmosphere, ε - caprolactone and pentaerythritol are mixed, and then ring - opening polymerization reaction occurs under the catalytic condition of a catalyst to generate hydroxyl - terminated polycaprolactone; 2) Hydroxyl - terminated polycaprolactone, crotonic anhydride, and toluene are mixed and heated under acidic conditions for reaction. After the reaction ends, glass fiber is immersed in the reaction solution. After immersion is completed, the glass fiber is taken out and dried to obtain polycaprolactone - coated glass fiber; 3) Bisphenol A epoxy vinyl ester resin and polycaprolactone - coated glass fiber are mixed and heated and stirred evenly to obtain a mixture. After the temperature of the mixture cools, ethylenediamine and azobisisobutyronitrile are added to the mixture, stirred evenly, and then vacuum degassing treatment and curing are carried out to obtain the composite crack - resistant filler; In step 1), the mass ratio of ε - caprolactone to pentaerythritol is 70 - 90:1; In step 1), the catalyst is stannous octoate; In step 2), the mass ratio of hydroxyl - terminated polycaprolactone, crotonic anhydride, and glass fiber is 100:8 - 10:5 - 8; In step 2), the heating temperature is 60 - 80 °C, and the reaction time is 2 - 4 h; In step 3), the mass ratio of epoxy vinyl ester resin, polycaprolactone - coated glass fiber, ethylenediamine, and azobisisobutyronitrile is 60 - 80:10 - 15:10 - 20:2 - 4.

2. The quickway pavement crack-resistant repair material according to claim 1, characterized in that: The particle size of the crushed stone is 10 - 30 mm.

3. The quick road surface crack-resistant repair material according to claim 1, characterized in that: The particle size of the mineral powder is 0.2 - 1 mm.

4. A method for preparing the expressway pavement crack-resistant repair material according to any one of claims 1-3, characterized in that, Comprising the following steps: Weigh each component according to the formula, mix asphalt and composite crack - resistant filler and heat and stir to obtain a slurry, add crushed stone, quartz sand, and mineral powder to the slurry, and stir and mix evenly to obtain the rapid - road pavement crack - resistant repair material.

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