Cold repair fluid for repairing pits and slots as well as preparation method and application of cold repair fluid

Abstract

The invention discloses a cold repair fluid for repairing pits and slots, and a preparation method and application thereof, and belongs to the field of functional materials of road engineering technology. The cold repair liquid provided by the invention comprises the following components in parts by mass: 500-1000 parts of polymer modified asphalt, 100-500 parts of a diluent, 200-1000 parts of thermosetting resin, 20-50 parts of a modifier and 20-80 parts of a compatilizer. The cold patch liquid has good flowability, high curing speed and high strength at normal temperature, and a cold patch mixture prepared from the cold patch liquid has good pavement performance such as construction workability, high-temperature stability, water stability and stripping resistance, is suitable for pit slot repair work of asphalt pavements, and is particularly suitable for rapid pit slot repair in low-temperature and 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 liquid for pothole repair, a preparation method thereof and an application thereof. Background Art

[0002] Potholes are typical diseases of asphalt pavement, which not only affect the service life of the pavement, but also endanger the safety of drivers and passengers. Potholes often occur in large traffic environments. The repair of potholes in asphalt pavements requires randomness, storage, early strength and durability. Therefore, in order to improve the quality of road use and ensure traffic safety, it is urgent to repair potholes in the road as soon as possible.

[0003] According to the repair method of potholes, it can be divided into hot patching and cold patching. Among them, the hot patching method is mature in technology, high in repair quality and good in durability, but it is greatly affected by weather conditions, and professional equipment and technology are required for repair, and it is 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, the 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 liquid for pothole repair, comprising the following components in parts by weight:

[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 liquid 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 content of the polymer 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 liquid 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 liquid 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, 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 thereto, stir to obtain the cold replenishment solution.

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

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

[0015] The invention provides a cold patch material, which consists 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 two of limestone and basalt; 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, the steps of which are as follows:

[0019] Mix the aggregate with the cold patch liquid, stir evenly, then add cement, 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 start the curing reaction, and high strength is quickly formed 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 reacts with water first to form active groups, and then quickly reacts with the polyurethane prepolymer to quickly form strength. Even after curing for 1 hour at -20°C, the Marshall stability of the mixture can still exceed 6kN, and traffic can be opened in 1 hour.

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

[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 the city's elevated roads before they were repaired;

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

[0029] Figure 3 Pictures of municipal road potholes before repair;

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

[0031] Figure 5 Picture of the pothole on the inner road before it was repaired;

[0032] Figure 6 Pictures of the potholes on the interior roads after they were repaired;

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

[0034] Figure 8 This is a picture of a road bridge pothole after repair;

[0035] Fig. 9 Picture of the pothole on the inner road before it was repaired;

[0036] Fig.10 Pictures of the potholes on the interior roads after they were repaired;

[0037] Fig.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] Other materials used in the present invention, if not otherwise stated, can be obtained through commercial channels. Other terms used in the present invention, unless otherwise specified, generally have the meanings commonly understood by those of ordinary skill in the art. The present invention is further described in detail below in conjunction with specific examples and with reference to data. The following examples are only for illustrating 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 replacement 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, keep 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 thereto, and stir at a rate of 200 r / min for 0.5 hours to obtain a cold replenishment solution.

[0045] In the preparation method of the above 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 a model of 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, the steps are as follows:

[0049] Aggregates and cement were heated at 165°C for 4 hours, and the moisture was dried and kept at room temperature for use. Then, the dried aggregates were placed in an asphalt mixture mixing pot and stirred at room temperature for 90 seconds, cold patching liquid was added and stirred for 90 seconds, and then cement was added and stirred for 90 seconds to obtain 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 liquid;

[0052] The aggregates are limestone fine aggregates with particle sizes of 0-3mm and 3-5mm and basalt coarse aggregates with particle sizes 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 Kentburg fly scattering test requirements in the Highway Engineering Asphalt and Asphalt Mixture Test Procedure (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] The cold patch material prepared with this cold patching liquid has a fast and high strength increase, and traffic can be opened after the repair is completed. The Marshall stability of the specimen cured at room temperature for 1 hour reaches 5kN, and the Marshall stability for 24 hours exceeds 20kN, which is suitable for rapid maintenance and emergency maintenance.

[0055] At the same time, the potholes were repaired on the elevated roads in the city. The construction conditions were light rain, RT 11℃, RH 70%. The effects before and after the repairs were as follows: Figure 1 and Figure 2 As shown:

[0056] There was accumulated water in the pit before the repair and it was not cleaned up. The cold patch material was used directly to repair the pit. After the repair, it could quickly form strength. After the repair, the joints were well bonded, the new and old interfaces were not damaged, and the repair condition was good.

[0057] Example 2

[0058] To prepare cold replacement 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, keep 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 thereto, and stir at a rate of 350 r / min for 0.35 hours to obtain a cold replenishment solution.

[0060] In the preparation method of the above 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 a chemical formula of C 24 H 38 O4; the one-component polyurethane prepolymer was purchased from Dow Chemical, with 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, the steps are as follows:

[0064] Aggregates and cement were heated at 165°C for 4 hours, and the moisture was dried and kept at room temperature for use. Then, the dried aggregates were placed in an asphalt mixture mixing pot and stirred at room temperature for 90 seconds, cold patching liquid was added and stirred for 90 seconds, and then cement was added and stirred for 90 seconds to obtain 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 liquid;

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

[0068] According to the Marshall stability test, immersion Marshall test, rutting test, beam bending test and Kentburg fly scattering test requirements in the Highway Engineering Asphalt and Asphalt Mixture Test Procedure (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] The cold patch material prepared with this cold patching liquid has a fast and high strength increase, and traffic can be opened after the repair is completed. The Marshall stability of the specimen cured at room temperature for 1 hour reaches 6kN, and the Marshall stability for 24 hours exceeds 25kN, which is suitable for rapid maintenance and emergency maintenance.

[0070] At the same time, the potholes were repaired 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 clear weather. It can quickly develop strength after repair. After repair, the joints are well bonded, the new and old interfaces are not damaged, and the repair condition is good.

[0072] Example 3

[0073] To prepare cold replacement 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, keep 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 cool naturally to below 40°C, add a single-component polyurethane prepolymer, a latent curing agent and a silane coupling agent thereto, and stir at a rate of 300 r / min for 0.2 hours to obtain a cold replenishment solution.

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

[0076] 500g polymer modified asphalt, 150g diluent, 250g single-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, the steps are as follows:

[0079] Aggregates and cement were heated at 165°C for 4 hours, and the moisture was dried and kept at room temperature for use. Then, the dried aggregates were placed in an asphalt mixture mixing pot and stirred at room temperature for 90 seconds, cold patching liquid was added and stirred for 90 seconds, and then cement was added and stirred for 90 seconds to obtain 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 liquid;

[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 Kentburg fly scattering test requirements in the Highway Engineering Asphalt and Asphalt Mixture Test Procedure (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] The cold patch material prepared with this cold patching liquid has a fast and high strength increase, and traffic can be opened after the repair is completed. The Marshall stability of the specimens cured at room temperature for 1 hour reaches 6kN, the 24h Marshall stability exceeds 30kN, the immersion Marshall strength exceeds 30kN, and the flying loss is only 7.2%. The cold patch material prepared with this cold patching liquid has all properties that are better than the requirements of hot-mix asphalt mixtures and has excellent road performance.

[0085] At the same time, the potholes were repaired on site on the internal roads. The construction conditions were light rain, RT 1℃, RH 74%. The effects 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 pit before the repair and it was not cleaned up. The cold patch material was used directly to repair the pit. 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 replacement 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, keep 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 thereto, and stir at a rate of 500 r / min for 0.5 hours to obtain a cold replenishment solution.

[0090] In the preparation method of the above 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 Polymer China Co., Ltd., with an NCO content of 15%, and the model 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, the steps are as follows:

[0094] Aggregates and cement were heated at 165°C for 4 hours, and the moisture was dried and kept at room temperature for use. Then, the dried aggregates were placed in an asphalt mixture mixing pot and stirred at room temperature for 90 seconds, cold patching liquid was added and stirred for 90 seconds, and then cement was added and stirred for 90 seconds to obtain cold patch material.

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

[0096] Aggregate 10kg, cement 0.3kg, cold make-up liquid 0.7kg;

[0097] The aggregates are limestone fine aggregates with particle sizes of 0-3mm and 3-5mm and basalt coarse aggregates with particle sizes of 5-10mm and 10-15mm; the amount of limestone is 4kg, and the amount of basalt is 6kg; the grading 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 Kentburg fly scattering test requirements in the Highway Engineering Asphalt and Asphalt Mixture Test Procedure (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] The cold patch material prepared with this cold patching liquid has a fast and high strength increase, and traffic can be opened after the repair is completed. The Marshall stability of the specimens cured at room temperature for 1 hour reaches 6kN, the 24h Marshall stability exceeds 30kN, the immersion Marshall strength exceeds 30kN, and the scattering loss is only 6.9%. The cold patch material prepared with this cold patching liquid has all properties that are better than the requirements of hot-mix asphalt mixtures and has excellent road performance.

[0100] At the same time, the potholes were repaired on the highway bridge. The construction conditions were sunny, RT 3℃, RH 76%. The effects 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. After repair, the joints are well bonded, the new and old interfaces are not damaged, and the repair condition is good.

[0102] Example 5

[0103] To prepare cold replacement 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, keep 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, add a single-component polyurethane prepolymer, a latent curing agent and a silane coupling agent thereto, and stir at a rate of 500 r / min for 0.2 hours to obtain a cold replenishment solution.

[0105] In the preparation method of the above 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, whose main component is hydrocarbon; the one-component polyurethane prepolymer is purchased from Covestro Polymer China Co., Ltd., with an NCO content of 12.5%, and the model 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, the steps are as follows:

[0109] Aggregates and cement were heated at 165°C for 4 hours, and the moisture was dried and kept at room temperature for use. Then, the dried aggregates were placed in an asphalt mixture mixing pot and stirred at room temperature for 90 seconds, cold patching liquid was added and stirred for 90 seconds, and then cement was added and stirred for 90 seconds to obtain cold patch material.

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

[0111] Aggregate 10kg, cement 0.8kg, cold make-up liquid 0.7kg;

[0112] The aggregate is limestone aggregate with a particle size 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 Kentburg fly scattering test requirements in the Highway Engineering Asphalt and Asphalt Mixture Test Procedure (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 with this cold patching liquid has a fast and high strength increase, and traffic can be opened after the repair is completed. The Marshall stability of the specimens cured at room temperature for 1 hour reaches 6kN, the 24h Marshall stability exceeds 30kN, the immersion Marshall strength exceeds 30kN, and the flying loss is only 5.6%. The cold patch material prepared with this cold patching liquid has all properties that are better than the requirements of hot-mix asphalt mixtures and has excellent road performance.

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

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

[0117] Comparative Example 1

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

[0119] Place the polymer modified asphalt in an oven at 140°C and heat for 2 hours until it melts; then add the diluent, keep the temperature at 140°C, and stir at a rate of 300r / 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 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, the steps are as follows:

[0124] Aggregates and cement were heated at 165°C for 4 hours, and the moisture was dried and kept at room temperature for use. Then, the dried aggregates were placed in an asphalt mixture mixing pot and stirred at room temperature for 90 seconds, cold patching liquid was added and stirred for 90 seconds, and then cement was added and stirred for 90 seconds to obtain cold patch material.

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

[0126] Aggregate 10kg, cement 0.8kg, cold make-up liquid 0.7kg;

[0127] The aggregate is limestone aggregate with a particle size 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 Kentburg fly scattering test requirements in the Highway Engineering Asphalt and Asphalt Mixture Test Procedure (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] The cold patch material prepared with this cold patching liquid has low early strength and slow strength increase. Its Marshall stability is only 5kN after 24h of room temperature curing. In the water immersion Marshall test, the specimens fell apart directly after 48h of immersion at 60℃, and the water stability could not be tested. Its high and low temperature performance and anti-stripping properties are poor, and it can only be used for pothole repairs on emergency repair roads.

[0130] Comparative Example 2

[0131] To prepare cold replacement 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, keep 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, add a single-component polyurethane prepolymer, a latent curing agent and a silane coupling agent thereto, and stir at a rate of 500 r / min for 0.2 hours to obtain a cold replenishment solution.

[0133] In the preparation method of the above 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, whose main component is hydrocarbon; the one-component polyurethane prepolymer is purchased from Covestro Polymer China Co., Ltd., with an NCO content of 12.5%, and the model 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, the steps are as follows:

[0137] Aggregates and mineral powder were heated at 165°C for 4 hours, and the moisture was dried and kept at room temperature for use. Then, the dried aggregates were placed in an asphalt mixture mixing pot and stirred at room temperature for 90 seconds, cold patching liquid was added and stirred for 90 seconds, and then mineral powder was added and stirred for 90 seconds to obtain 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 liquid 0.7kg;

[0140] The aggregate is limestone aggregate with a particle size 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 Kentburg fly scattering test requirements in the Highway Engineering Asphalt and Asphalt Mixture Test Procedure (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 with this cold patching liquid has a fast and high strength increase, and traffic can be opened after the repair is completed. The Marshall stability of the specimen cured at room temperature for 1 hour reaches 6kN, and the Marshall stability for 24 hours exceeds 30kN. However, its water stability and anti-stripping properties are slightly poor, indicating that cement can effectively improve the water stability and anti-stripping properties of the cold patch material.

[0143] In the above-mentioned 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] In Table 2 above, the stability obtained by the Marshall test can reflect the curing speed and early strength of the cold patch material. The Marshall stability of ordinary hot mix asphalt mixture for 24 hours is generally 8kN, while the Marshall stability of the cold patch material of the present invention is basically above 30kN, indicating that it has ultra-high strength. All other properties meet and exceed the performance requirements of the Highway Asphalt Pavement Construction Technical Specification (JTG F40-2004) for hot mix asphalt mixture, which shows that the cold patch material has good durability.

[0148] In addition, after 3 months of repair with common cold patch materials, cracking and loosening will occur again. After 3 years of repair with the cold patch material in Example 5, except for the peeling of the surface layer, the joints are well bonded and there is no damage to the new and old interfaces. Fig.11 As shown, it shows good durability.

[0149] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A cold filling fluid for pothole repair, characterized in that: Contains the following components 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, and 20-80 parts of compatibilizer.

2. The cold filling fluid for pothole repair according to claim 1, characterized in that: 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.

3. The cold filling fluid for pothole repair according to claim 1, characterized in that: The thermosetting resin is a single-component polyurethane prepolymer, and the NCO content in the molecule is 12.5-16.5%.

4. The cold filling fluid for pothole repair according to claim 1, characterized in that: The modifier is selected from one or both of ketimine latent curing agents and aldimine latent curing agents.

5. The cold filling fluid for pothole repair according to claim 1, characterized in that: The diluent is selected from one or more of acetone, toluene, xylene, dichloropropane, tetrachloroethylene, dibutyl phthalate, dioctyl phthalate, diesel and biodiesel.

6. The cold filling fluid for pothole repair according to claim 1, characterized in that: The compatibilizer is selected from one or more of 3-aminopropyltriethoxysilane, 3-epoxypropyltriethoxysilane and vinyltriethoxysilane.

7. The method for preparing the cold filling fluid for pothole repair according to any one of claims 1 to 6, 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, 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 thereto, stir to obtain the cold replenishment solution.

8. The preparation method according to claim 7, characterized in that: The stirring condition is: stirring at 100-500 r / min for 0.2-1 h.

9. Use of the cold pothole repairing liquid according to claim 1 in road pothole repairing.

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