Cold patching fluid for pothole repair, preparation method and application thereof

Abstract

The present invention discloses a cold patching fluid for pothole repair, its preparation method, and its application, belonging to the field of functional materials for road engineering technology. The cold patching fluid of the present invention comprises the following components by weight: 500-1000 parts of polymer-modified asphalt, 100-500 parts of diluent, 200-1000 parts of thermosetting resin, 20-50 parts of modifier, and 20-80 parts of compatibilizer. The cold patching fluid has good fluidity at room temperature, fast curing speed, and high strength. The cold patch mixture prepared from it has excellent road performance properties such as workability, high-temperature stability, water stability, and spalling resistance. It is suitable for pothole repair on asphalt pavements, and is particularly suitable for rapid pothole repair in low-temperature, humid environments.

Description

Technical Field

[0001] The present invention belongs to the field of functional materials for road engineering technology, and in particular relates to a cold patching fluid for pothole repair, a preparation method thereof, and an application thereof. Background Art

[0002] Potholes are a typical problem on asphalt pavements, not only affecting their service life but also endangering the safety of drivers and passengers. Potholes often occur in heavy traffic environments, and asphalt pavement pothole repair requires a combination of randomness, storability, early strength, and durability. Therefore, to improve road quality and ensure traffic safety, prompt pothole repair is crucial.

[0003] Potholes can be divided into hot patching and cold patching according to their repair methods. Among them, the hot patching method is mature in technology, with high repair quality and good durability, but it is greatly affected by weather conditions, and professional equipment and technology are required for repair, making it impossible to repair potholes in a timely and rapid manner. Compared with the hot patching method, the cold patching method is convenient to construct, is not affected by weather conditions, and has a wide range of applications. However, existing cold patch materials have problems such as low initial strength, slow strength growth, and poor durability. Under the influence of traffic loads and climate, cold patch materials are prone to loosening and falling off again after repair, requiring frequent repairs, and the repair effect is not as good as the hot patching method. Therefore, there is an urgent need to develop a cold patch asphalt mixture with fast curing speed, high strength, and good durability for road pothole repair. Summary of the Invention

[0004] The present invention provides a cold patching fluid for pothole repair, comprising the following components in parts by mass:

[0005] 500-1000 parts of polymer modified asphalt, 100-500 parts of diluent, 200-1000 parts of thermosetting resin, 20-50 parts of modifier, and 20-80 parts of compatibilizer.

[0006] In the above-mentioned cold patching fluid for pothole repair, the polymer-modified asphalt is selected from one or more of SBS-modified asphalt, SBR-modified asphalt, rubber asphalt, PE-modified asphalt, and PP-modified asphalt; wherein the polymer content in the polymer-modified asphalt is 2.5-3.5%; the polymer is SBS, SBR, rubber, PE, PP, etc.

[0007] In the above-mentioned cold patching liquid for pothole repair, the thermosetting resin is a single-component polyurethane prepolymer, and the NCO content in the molecule is 12.5-16.5%.

[0008] In the above-mentioned cold patching fluid for pothole repair, the modifier is a ketone (aldehyde) imine latent curing agent, which can be specifically selected from one or more of ketone imine latent curing agents (VESTANAT EP-BF 1325 / 100, Desmodur BL 3175 / 1) and aldimine latent curing agents (VESTANAT EP-BF 2033 / 100, DESMODUR BL 3260).

[0009] In the above-mentioned cold patching fluid for pothole repair, the diluent is selected from one or more of acetone, toluene, xylene, dichloropropane, tetrachloroethylene, dibutyl phthalate, dioctyl phthalate, diesel, and biodiesel.

[0010] In the above-mentioned cold patching fluid for pothole repair, the compatibilizer is a silane coupling agent, which is selected from one or more of 3-aminopropyltriethoxysilane (KH550), 3-epoxypropyltriethoxysilane (KH560), and vinyltriethoxysilane (KH570).

[0011] The present invention provides a method for preparing the above-mentioned cold patching fluid for pothole repair, comprising the following steps:

[0012] Heat the polymer modified asphalt at 130-140°C until it melts; then add the diluent, maintain the temperature at 130-140°C, and stir to obtain an asphalt solution; finally, wait for the asphalt solution to naturally cool to below 40°C, add the thermosetting resin, modifier and compatibilizer, and stir to obtain the cold patch solution.

[0013] In the above preparation method, the stirring condition is selected from: stirring at 100-500 r / min for 0.2-1 h.

[0014] The present invention provides application of the cold patching fluid in road pothole repair.

[0015] The present invention provides a cold patch material composed of the following components: 10 parts of aggregate, 0.2-0.8 parts of cement, and 0.65-0.75 parts of cold patch liquid.

[0016] In the present invention, the aggregate is selected from one or both of limestone and basalt; and its gradation is a dense gradation, selected from one or more of LB-10, AC-10, and AC-13.

[0017] In the present invention, the cement is one of ordinary Portland cement (PO42.5) and slag Portland cement (PS42.5).

[0018] The present invention provides a method for preparing the above-mentioned cold patch material, comprising the following steps:

[0019] Mix the aggregate with the cold patch liquid, stir evenly, then add cement and stir evenly to obtain the cold patch material.

[0020] The present invention provides application of the cold patch material in road pothole repair.

[0021] The beneficial effects of the present invention are:

[0022] (1) High Strength: Using a single-component polyurethane prepolymer, the polyurethane is activated by water to initiate a curing reaction, rapidly developing high strength within 30-60 minutes. The Marshall stability of the mixture prepared at different temperatures can exceed 30kN.

[0023] (2) Fast curing: Under water activation, the latent curing agent preferentially reacts with water to form active groups, which then rapidly react with the polyurethane prepolymer, rapidly developing strength. Even after curing at -20°C for one hour, the Marshall stability of the mixture can still exceed 6kN, allowing traffic to be opened within one hour.

[0024] (3) Simple construction: When repairing potholes and grooves, only a small amount of water needs to be added, and the mixture will form strength at room temperature. If there is water in the potholes and grooves, there is no need to clean it up, which will achieve better results and simplify the construction process.

[0025] (4) Energy saving and environmental protection: The mixture is mixed and constructed at room temperature, which reduces energy consumption and greenhouse gas emissions. No harmful gases and odors are generated during the construction process, which helps improve the air quality at the construction site.

[0026] (5) Strong environmental adaptability: This high-strength, fast-curing mixture is suitable for various road types and environments, and is particularly suitable for repairing potholes on asphalt pavements under harsh conditions such as low temperature and humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Pictures of potholes on urban elevated roads before repair;

[0028] Figure 2 Pictures of potholes on urban elevated roads after repairs;

[0029] Figure 3 This is a picture of the potholes on the municipal road before repair;

[0030] Figure 4 Pictures of potholes on municipal roads after repair;

[0031] Figure 5 Picture of the pothole on the internal road before repair;

[0032] Figure 6 Picture of the potholes on the internal road after repair;

[0033] Figure 7This is a picture of a highway bridge pothole before repair;

[0034] Figure 8 This is a picture of the pothole on the highway bridge after repair;

[0035] Figure 9 Picture of the pothole on the internal road before repair;

[0036] Figure 10 Picture of the potholes on the internal road after repair;

[0037] Figure 11 This is a picture of the pothole repaired three years after the cold patch material in Example 5 was used. DETAILED DESCRIPTION

[0038] In the present invention, the gradation of the aggregate used is a dense gradation, including LB-10, AC-10 and AC-13, as shown in Table 1:

[0039] Table 1 Particle size of each level of formulation

[0040]

[0041] The other materials used in the present invention, unless otherwise stated, can be obtained through commercial channels. Unless otherwise specified, other terms used in the present invention generally have the meanings commonly understood by those of ordinary skill in the art. The present invention will be further described in detail below with reference to specific examples and data. The following examples are merely for illustration of the present invention and are not intended to limit the scope of the present invention in any way.

[0042] Example 1

[0043] To prepare cold infusion solution, follow these steps:

[0044] Place the polymer-modified asphalt in an oven at 130°C and heat it for 2 hours until it melts; then add the diluent, maintain the temperature at 130°C, and stir at a rate of 100 r / min for 1 hour to obtain an asphalt solution; finally, wait for the asphalt solution to naturally cool to below 40°C, add a single-component polyurethane prepolymer, a latent curing agent, and a silane coupling agent, and stir at a rate of 200 r / min for 0.5 hours to obtain a cold patch solution.

[0045] In the preparation method of the above-mentioned cold infusion solution, the raw materials and their amounts are as follows:

[0046] 1000g polymer modified asphalt, 100g diluent, 200g one-component polyurethane prepolymer, 20g latent curing agent, 30g silane coupling agent;

[0047] The polymer-modified asphalt is SBS modified asphalt, purchased from Jiangsu Nantong Tongsha Asphalt Technology Co., Ltd.; the diluent is dichloropropane, the main component of which is 1,2-dichloropropane (chemical formula: C3H5Cl2); the one-component polyurethane prepolymer is purchased from Yantai Wanhua Chemical Group Co., Ltd., with an NCO content of 16.5% and model TDI-80; the latent curing agent is VESTANAT EP-BF 1325 / 100 (ketimine latent curing agent), purchased from Evonik Specialty Chemicals Shanghai Co., Ltd.; the silane coupling agent is 3-aminopropyltriethoxysilane (KH550).

[0048] To prepare cold patch material, follow these steps:

[0049] Heat the aggregate and cement at 165°C for 4 hours to dry out the moisture and set aside at room temperature. Then, place the dried aggregate in an asphalt mixture mixer and stir at room temperature for 90 seconds. Add the cold patch solution and continue stirring for 90 seconds. Then, add the cement and continue stirring for another 90 seconds to obtain the cold patch material.

[0050] In the preparation method of the above cold patch material, the raw materials and their amounts are as follows:

[0051] 10kg aggregate, 0.2kg cement, 0.75kg cold make-up fluid;

[0052] The aggregates used are limestone fine aggregate with particle sizes of 0-3mm and 3-5mm and basalt coarse aggregate with particle size of 5-10mm, wherein the amount of limestone is 7kg and the amount of basalt is 3kg; the gradation of the two is LB-10; the cement is ordinary Portland cement (PO42.5).

[0053] According to the Marshall stability test, immersion Marshall test, rutting test, beam bending test and Kentburgh fly scatter test requirements in the Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011), the strength, water stability, high and low temperature stability and anti-stripping performance of the cold patch material were tested. The test results are shown in Table 2:

[0054] Cold patch material prepared with this cold patching fluid exhibits rapid and high strength gains, allowing traffic to resume immediately after the repair is complete. The Marshall stability of specimens cured at room temperature for one hour reaches 5kN, and the Marshall stability exceeds 20kN after 24 hours, making it suitable for rapid and emergency curing.

[0055] At the same time, the pothole repair was carried out on the urban elevated road. The construction conditions were light rain, RT 11℃, RH 70%. The results before and after the repair were as follows: Figure 1 and Figure 2 As shown:

[0056] If there is accumulated water in the pits and grooves that has not been cleaned before repair, the cold patch material can be used directly to repair the pits and grooves. The strength can be quickly formed after the repair, the joints are well bonded after the repair, the new and old interfaces are not damaged, and the repair condition is good.

[0057] Example 2

[0058] To prepare cold infusion solution, follow these steps:

[0059] Place the polymer-modified asphalt in an oven at 135°C and heat it for 2 hours until it melts; then add the diluent, maintain the temperature at 135°C, and stir at a rate of 200 r / min for 0.75 hours to obtain an asphalt solution; finally, wait for the asphalt solution to naturally cool to below 40°C, add a single-component polyurethane prepolymer, a latent curing agent, and a silane coupling agent, and stir at a rate of 350 r / min for 0.35 hours to obtain a cold patch solution.

[0060] In the preparation method of the above-mentioned cold infusion solution, the raw materials and their amounts are as follows:

[0061] 1000g polymer modified asphalt, 300g diluent, 600g one-component polyurethane prepolymer, 30g latent curing agent, 50g silane coupling agent;

[0062] The polymer modified asphalt is SBS modified asphalt, purchased from Jiangsu Nantong Tongsha Asphalt Technology Co., Ltd.; the diluent is dioctyl phthalate (DOP), which is an ester compound generated by the reaction of phthalic acid and n-octanol, with the chemical formula C 24 H 38 O4; the one-component polyurethane prepolymer was purchased from Dow Chemical, having an NCO content of 14.5%, and the model was Voranate T-80; the latent curing agent was DESMODUR BL 3260 (aldimine latent curing agent), purchased from Evonik Specialty Chemicals Shanghai Co., Ltd.; the silane coupling agent was 3-aminopropyltriethoxysilane (KH550).

[0063] To prepare cold patch material, follow these steps:

[0064] Heat the aggregate and cement at 165°C for 4 hours to dry out the moisture and set aside at room temperature. Then, place the dried aggregate in an asphalt mixture mixer and stir at room temperature for 90 seconds. Add the cold patch solution and continue stirring for 90 seconds. Then, add the cement and continue stirring for another 90 seconds to obtain the cold patch material.

[0065] In the preparation method of the above cold patch material, the raw materials and their amounts are as follows:

[0066] 10kg aggregate, 0.5kg cement, 0.7kg cold make-up fluid;

[0067] The aggregates are limestone fine aggregates with particle sizes of 0-3mm and 3-5mm and basalt coarse aggregates with particle size of 5-10mm, wherein the amount of limestone is 6kg and the amount of basalt is 4kg; the gradation of the two is AC-10; the cement is ordinary Portland cement (PO42.5).

[0068] According to the Marshall stability test, immersion Marshall test, rutting test, beam bending test and Kentburgh fly scatter test requirements in the Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011), the strength, water stability, high and low temperature stability and anti-stripping performance of the cold patch material were tested. The test results are shown in Table 2:

[0069] Cold patch material prepared with this cold patching fluid exhibits rapid and high strength gains, allowing traffic to resume immediately after the repair is complete. The Marshall stability of specimens cured at room temperature for one hour reaches 6kN, and the Marshall stability exceeds 25kN after 24 hours, making it suitable for rapid and emergency curing.

[0070] At the same time, pothole repairs were carried out on the municipal roads. The construction conditions were sunny, RT 4℃, RH 84%. The effects before and after the repairs were as follows: Figure 3 and Figure 4 As shown:

[0071] Use this cold patch material to repair potholes in sunny weather. It can quickly form strength after repair. The joints are well bonded after repair, and there is no damage to the new and old interfaces, and the repair is in good condition.

[0072] Example 3

[0073] To prepare cold infusion solution, follow these steps:

[0074] Place the polymer-modified asphalt in an oven at 130°C and heat it for 2 hours until it melts; then add the diluent, maintain the temperature at 130°C, and stir at a rate of 200 r / min for 0.5 hours to obtain an asphalt solution; finally, wait for the asphalt solution to naturally cool to below 40°C, add a single-component polyurethane prepolymer, a latent curing agent, and a silane coupling agent, and stir at a rate of 300 r / min for 0.2 hours to obtain a cold patch solution.

[0075] In the preparation method of the above-mentioned cold infusion solution, the raw materials and their amounts are as follows:

[0076] 500g polymer modified asphalt, 150g diluent, 250g one-component polyurethane prepolymer, 25g latent curing agent, 25g silane coupling agent;

[0077] The polymer-modified asphalt is SBS modified asphalt, purchased from Jiangsu Nantong Tongsha Asphalt Technology Co., Ltd.; the diluent is 0# diesel, the main component of which is hydrocarbon; the one-component polyurethane prepolymer is purchased from Dow Chemical, with an NCO content of 16%, and the model is Voranate M 220; the latent curing agent is DESMODUR BL 3260 (aldimine latent curing agent), purchased from Evonik Specialty Chemicals Shanghai Co., Ltd.; the silane coupling agent is 3-aminopropyltriethoxysilane (KH550).

[0078] To prepare cold patch material, follow these steps:

[0079] Heat the aggregate and cement at 165°C for 4 hours to dry out the moisture and set aside at room temperature. Then, place the dried aggregate in an asphalt mixture mixer and stir at room temperature for 90 seconds. Add the cold patch solution and continue stirring for 90 seconds. Then, add the cement and continue stirring for another 90 seconds to obtain the cold patch material.

[0080] In the preparation method of the above cold patch material, the raw materials and their amounts are as follows:

[0081] 10kg aggregate, 0.2kg cement, 0.7kg cold make-up fluid;

[0082] The aggregate is limestone aggregate with a particle size of 0-5mm and 5-10mm, and the gradation is AC-10; the cement is slag silicate cement (PS42.5).

[0083] According to the Marshall stability test, immersion Marshall test, rutting test, beam bending test and Kentburgh fly scatter test requirements in the Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011), the strength, water stability, high and low temperature stability and anti-stripping performance of the cold patch material were tested. The test results are shown in Table 2:

[0084] Cold patch material prepared using this cold patching fluid exhibits rapid and high strength gains, allowing traffic to resume immediately after the repair is complete. The Marshall stability of specimens cured at room temperature for one hour reached 6kN, and the Marshall stability exceeded 30kN after 24 hours. The Marshall strength after immersion in water exceeded 30kN, and the fly scatter loss was only 7.2%. All properties of cold patch material prepared using this cold patching fluid exceed those required for hot-mix asphalt, demonstrating excellent road performance.

[0085] At the same time, pothole repairs were carried out on the internal roads. The construction conditions were light rain, RT 1℃, RH 74%. The results before and after the repairs were as follows: Figure 5 and Figure 6 As shown:

[0086] There was a small amount of accumulated water in the potholes before the repair and it was not cleaned up. The cold patch material was used directly to repair the potholes. The cold patch material is not afraid of water and can quickly form strength after the repair. After the repair, the joints are well bonded, the new and old interfaces are not damaged, and the repair condition is good.

[0087] Example 4

[0088] To prepare cold infusion solution, follow these steps:

[0089] Place the polymer-modified asphalt in an oven at 130°C and heat it for 2 hours until it melts; then add the diluent, maintain the temperature at 130°C, and stir at a rate of 300 r / min for 0.5 hours to obtain an asphalt solution; finally, wait for the asphalt solution to naturally cool to below 40°C, add a single-component polyurethane prepolymer, a latent curing agent, and a silane coupling agent, and stir at a rate of 500 r / min for 0.5 hours to obtain a cold patch solution.

[0090] In the preparation method of the above-mentioned cold infusion solution, the raw materials and their amounts are as follows:

[0091] 1000g polymer modified asphalt, 200g diluent, 700g one-component polyurethane prepolymer, 30g latent curing agent, 30g silane coupling agent;

[0092] The polymer-modified asphalt is SBS modified asphalt, purchased from Jiangsu Nantong Tongsha Asphalt Technology Co., Ltd.; the diluent is biodiesel, which is a fatty acid methyl ester formed by the reaction of vegetable oil, animal oil or waste oil with methanol; the one-component polyurethane prepolymer is purchased from Covestro Polymers China Co., Ltd., with an NCO content of 15% and the model number is Desmodur L 75; the latent curing agent is VESTANAT EP-BF 1325 / 100 (ketimine latent curing agent), purchased from Evonik Specialty Chemicals Shanghai Co., Ltd.; the silane coupling agent is 3-aminopropyltriethoxysilane (KH550).

[0093] To prepare cold patch material, follow these steps:

[0094] Heat the aggregate and cement at 165°C for 4 hours to dry out the moisture and set aside at room temperature. Then, place the dried aggregate in an asphalt mixture mixer and stir at room temperature for 90 seconds. Add the cold patch solution and continue stirring for 90 seconds. Then, add the cement and continue stirring for another 90 seconds to obtain the cold patch material.

[0095] In the preparation method of the above cold patch material, the raw materials and their amounts are as follows:

[0096] 10kg aggregate, 0.3kg cement, 0.7kg cold make-up fluid;

[0097] The aggregates are limestone fine aggregate with a particle size of 0-3mm and 3-5mm and basalt coarse aggregate with a particle size of 5-10mm and 10-15mm; the amount of limestone is 4kg and the amount of basalt is 6kg; the gradation of the two is AC-13; the cement is ordinary Portland cement (PO42.5).

[0098] According to the Marshall stability test, immersion Marshall test, rutting test, beam bending test and Kentburgh fly scatter test requirements in the Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011), the strength, water stability, high and low temperature stability and anti-stripping performance of the cold patch material were tested. The test results are shown in Table 2:

[0099] Cold patch material prepared using this cold patching fluid exhibits rapid and high strength gains, allowing traffic to resume immediately after the repair is complete. The Marshall stability of specimens cured at room temperature for one hour reached 6kN, and the Marshall stability exceeded 30kN after 24 hours. The Marshall strength after immersion in water exceeded 30kN, and the fly scatter loss was only 6.9%. All properties of cold patch material prepared using this cold patching fluid exceed those required for hot-mix asphalt, demonstrating excellent road performance.

[0100] At the same time, the pothole repair was carried out on the highway bridge. The construction conditions were sunny, RT 3℃, RH 76%. The results before and after the repair were as follows: Figure 7 and Figure 8 As shown:

[0101] This cold patch material is used to repair potholes on highway bridges in clear weather. It can still quickly develop strength after repair. The joints are well bonded after repair, and there is no damage to the new and old interfaces, and the repair is in good condition.

[0102] Example 5

[0103] To prepare cold infusion solution, follow these steps:

[0104] Place the polymer-modified asphalt in an oven at 140°C and heat it for 2 hours until it melts; then add the diluent, maintain the temperature at 140°C, and stir at a rate of 300 r / min for 0.2 hours to obtain an asphalt solution; finally, wait for the asphalt solution to naturally cool to below 40°C, add a single-component polyurethane prepolymer, a latent curing agent, and a silane coupling agent, and stir at a rate of 500 r / min for 0.2 hours to obtain a cold patch solution.

[0105] In the preparation method of the above-mentioned cold infusion solution, the raw materials and their amounts are as follows:

[0106] 500g polymer modified asphalt, 250g diluent, 500g one-component polyurethane prepolymer, 25g latent curing agent, 40g silane coupling agent;

[0107] The polymer-modified asphalt is SBS modified asphalt, purchased from Jiangsu Nantong Tongsha Asphalt Technology Co., Ltd.; the diluent is 0# diesel, the main component of which is hydrocarbons; the one-component polyurethane prepolymer is purchased from Covestro Polymers China Co., Ltd., with an NCO content of 12.5% and the model number is Desmodur E-22; the latent curing agent is DESMODUR BL3260 (aldimine latent curing agent), purchased from Evonik Specialty Chemicals Shanghai Co., Ltd.; the silane coupling agent is 3-aminopropyltriethoxysilane (KH550).

[0108] To prepare cold patch material, follow these steps:

[0109] Heat the aggregate and cement at 165°C for 4 hours to dry out the moisture and set aside at room temperature. Then, place the dried aggregate in an asphalt mixture mixer and stir at room temperature for 90 seconds. Add the cold patch solution and continue stirring for 90 seconds. Then, add the cement and continue stirring for another 90 seconds to obtain the cold patch material.

[0110] In the preparation method of the above cold patch material, the raw materials and their amounts are as follows:

[0111] 10kg aggregate, 0.8kg cement, 0.7kg cold make-up fluid;

[0112] The aggregates are limestone aggregates with particle sizes of 0-5mm, 5-10mm, and 10-15mm, and the gradation is AC-13; the cement is slag silicate cement (PS42.5).

[0113] According to the Marshall stability test, immersion Marshall test, rutting test, beam bending test and Kentburgh fly scatter test requirements in the Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011), the strength, water stability, high and low temperature stability and anti-stripping performance of the cold patch material were tested. The test results are shown in Table 2:

[0114] The cold patch material prepared using this cold patching fluid exhibits rapid and high strength gains, allowing traffic to resume immediately upon completion. The Marshall stability of specimens cured at room temperature for one hour reached 6kN, and the Marshall stability exceeded 30kN after 24 hours. Its Marshall strength after immersion in water also exceeded 30kN, with a scattering loss of only 5.6%. All performance characteristics of the cold patch material prepared using this cold patching fluid exceed those required for hot-mix asphalt, demonstrating excellent road performance.

[0115] At the same time, pothole repairs were carried out on the internal roads. The construction conditions were sunny, RT 5℃, RH 44%. The effects before and after the repairs were as follows: Figure 9 and Figure 10 As shown:

[0116] This cold patch material was used to repair potholes in the yard under clear weather. The material was still able to quickly develop strength after repair. The joints were well bonded after repair, and there was no damage to the new and old interfaces, indicating that the repair was in good condition.

[0117] Comparative Example 1

[0118] To prepare cold infusion solution, follow these steps:

[0119] Place the polymer-modified asphalt in an oven at 140°C and heat it for 2 hours until it melts; then add the diluent, maintain the temperature at 140°C, and stir at a rate of 300 r / min for 0.2 hours to obtain an asphalt solution; finally, wait for the asphalt solution to cool naturally to below 40°C to obtain a cold replenishment solution.

[0120] In the preparation method of the above-mentioned cold infusion solution, the raw materials and their amounts are as follows:

[0121] 500g polymer modified asphalt, 250g diluent;

[0122] The polymer modified asphalt is SBS modified asphalt, purchased from Jiangsu Nantong Tongsha Asphalt Technology Co., Ltd.; the diluent is 0# diesel, the main component of which is hydrocarbon;

[0123] To prepare cold patch material, follow these steps:

[0124] Heat the aggregate and cement at 165°C for 4 hours to dry out the moisture and set aside at room temperature. Then, place the dried aggregate in an asphalt mixture mixer and stir at room temperature for 90 seconds. Add the cold patch solution and continue stirring for 90 seconds. Then, add the cement and continue stirring for another 90 seconds to obtain the cold patch material.

[0125] In the preparation method of the above cold patch material, the raw materials and their amounts are as follows:

[0126] 10kg aggregate, 0.8kg cement, 0.7kg cold make-up fluid;

[0127] The aggregates are limestone aggregates with particle sizes of 0-5mm, 5-10mm, and 10-15mm, and the gradation is AC-13; the cement is slag silicate cement (PS42.5).

[0128] According to the Marshall stability test, immersion Marshall test, rutting test, beam bending test and Kentburgh fly scatter test requirements in the Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011), the strength, water stability, high and low temperature stability and anti-stripping performance of the cold patch material were tested. The test results are shown in Table 2:

[0129] Cold patch material prepared using this cold patching fluid exhibited low early strength and slow strength development. Its Marshall stability after 24 hours of room temperature curing was only 5 kN. During a Marshall test, the specimen disintegrated after 48 hours of immersion in 60°C water, making it impossible to test its water stability. Its high- and low-temperature performance and spalling resistance were both poor, making it suitable only for pothole repairs in emergency road repairs.

[0130] Comparative Example 2

[0131] To prepare cold infusion solution, follow these steps:

[0132] Place the polymer-modified asphalt in an oven at 140°C and heat it for 2 hours until it melts; then add the diluent, maintain the temperature at 140°C, and stir at a rate of 300 r / min for 0.2 hours to obtain an asphalt solution; finally, wait for the asphalt solution to naturally cool to below 40°C, add a single-component polyurethane prepolymer, a latent curing agent, and a silane coupling agent, and stir at a rate of 500 r / min for 0.2 hours to obtain a cold patch solution.

[0133] In the preparation method of the above-mentioned cold infusion solution, the raw materials and their amounts are as follows:

[0134] 500g polymer modified asphalt, 250g diluent, 500g one-component polyurethane prepolymer, 25g latent curing agent, 40g silane coupling agent;

[0135] The polymer-modified asphalt is SBS modified asphalt, purchased from Jiangsu Nantong Tongsha Asphalt Technology Co., Ltd.; the diluent is 0# diesel, the main component of which is hydrocarbons; the one-component polyurethane prepolymer is purchased from Covestro Polymers China Co., Ltd., with an NCO content of 12.5% and the model number is Desmodur E-22; the latent curing agent is DESMODUR BL3260 (aldimine latent curing agent), purchased from Evonik Specialty Chemicals Shanghai Co., Ltd.; the silane coupling agent is 3-aminopropyltriethoxysilane (KH550).

[0136] To prepare cold patch material, follow these steps:

[0137] Heat the aggregate and mineral powder at 165°C for 4 hours to dry out the moisture and set aside at room temperature. Then, place the dried aggregate in an asphalt mixture mixing kettle and stir at room temperature for 90 seconds. Add the cold patch solution and continue stirring for 90 seconds. Then, add the mineral powder and continue stirring for another 90 seconds to obtain the cold patch material.

[0138] In the preparation method of the above cold patch material, the raw materials and their amounts are as follows:

[0139] Aggregate 10kg, mineral powder 0.8kg, cold make-up fluid 0.7kg;

[0140] The aggregate is limestone aggregate with particle sizes of 0-5mm, 5-10mm, and 10-15mm, and the gradation is AC-13; the mineral powder is slag powder (S95).

[0141] According to the Marshall stability test, immersion Marshall test, rutting test, beam bending test and Kentburgh fly scatter test requirements in the Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011), the strength, water stability, high and low temperature stability and anti-stripping performance of the cold patch material were tested. The test results are shown in Table 2:

[0142] The cold patch material prepared using this cold patching fluid exhibits rapid and high strength gains, allowing traffic to resume after the repair is complete. The Marshall stability of specimens cured at room temperature for one hour reached 6 kN, and exceeded 30 kN after 24 hours. However, its water stability and spalling resistance were slightly poor, demonstrating that cement can effectively improve the water stability and spalling resistance of this cold patch material.

[0143] In the above Examples 1 to 5 and Comparative Examples 1-2, the road performance test results of each cold patch material are shown in Table 2:

[0144] Table 2 Cold patch material road performance test results

[0145]

[0146]

[0147] The stability measured by the Marshall test in Table 2 reflects the curing speed and early strength of the cold patch material. While the 24-hour Marshall stability of conventional hot-mix asphalt mixtures is typically 8 kN, the Marshall stability of the cold patch material described herein is consistently above 30 kN, demonstrating its exceptionally high strength. All other performance characteristics meet or exceed the requirements for hot-mix asphalt mixtures in the Technical Specification for Highway Asphalt Pavement Construction (JTG F40-2004), demonstrating the excellent durability of this cold patch material.

[0148] In addition, after 3 months of repair, the common cold patch material will crack and loosen again. After 3 years of repair, the cold patch material in Example 5 has good adhesion except for the peeling of the surface layer, and there is no damage to the new and old interfaces. Figure 11 As shown, it shows good durability.

[0149] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other manner. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention remain within the scope of protection of the present invention.

Claims

1. A cold filling fluid for pothole repair, characterized in that: It is composed of the following components in parts by mass: 500-1000 parts of polymer modified asphalt, 100-500 parts of diluent, 200-1000 parts of thermosetting resin, 20-50 parts of modifier, 20-80 parts of compatibilizer; The polymer modified asphalt is selected from one or more of SBS modified asphalt, SBR modified asphalt, rubber asphalt, PE modified asphalt, and PP modified asphalt; The thermosetting resin is a single-component polyurethane prepolymer, and the NCO content in the molecule is 12.5-16.5%; The modifier is selected from one or both of ketimine latent curing agents and aldimine latent curing agents; The diluent is selected from one or more of acetone, toluene, xylene, dichloropropane, tetrachloroethylene, dibutyl phthalate, dioctyl phthalate, and diesel; The compatibilizer is selected from one or more of 3-aminopropyltriethoxysilane, 3-epoxypropyltriethoxysilane, and vinyltriethoxysilane.

2. The method for preparing the cold patching fluid for pothole repair according to claim 1, characterized in that: The steps include: Heat the polymer modified asphalt at 130-140°C until it melts; then add the diluent, maintain the temperature at 130-140°C, and stir to obtain an asphalt solution; finally, wait for the asphalt solution to naturally cool to below 40°C, add the thermosetting resin, modifier and compatibilizer, and stir to obtain the cold patch solution.

3. The preparation method according to claim 2, characterized in that The stirring conditions are: stirring at 100-500 r / min for 0.2-1 h.

4. Use of the cold pothole repair liquid according to claim 1 in road pothole repair.

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