Asphalt concrete pavement pothole quick remediation material and preparation method thereof

Abstract

The present invention provides a quick remedial material for potholes in asphalt concrete pavement and a preparation method thereof, which belongs to the technical field of asphalt pavement repair materials. The preparation method comprises: providing a liquid material, the liquid material comprises road petroleum asphalt, an emulsifier aqueous solution, a polymer resin and a nano-additive material; providing a solid material, the solid material comprises aggregate and cement; providing a mixing device, so that the liquid material and the solid material are in contact in the mixing device, and are stirred and mixed evenly, so as to obtain the quick remedial material for potholes in asphalt concrete pavement; the mass of the liquid material is 5-20% of the mass of the solid material. The quick remedial material of the present invention has a short setting time, high strength, strong adhesion between the new and old interfaces, no need to add water during mixing, no need to close traffic during construction, and traffic can be opened immediately after construction. It can be mixed and used at room temperature, is not affected by air temperature and environment, has no toxic gas discharge, is safe and environmentally friendly, and has lower production cost.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt pavement repair materials, and in particular to an asphalt concrete pavement pothole quick remediation material and a preparation method thereof. Background Art

[0002] Highway pavement includes asphalt pavement and cement concrete pavement. Asphalt pavement has the advantages of low noise, low wear on the vehicle tread, good toughness, compression resistance and tensile strength, etc. Therefore, asphalt pavement is being laid and applied more and more. However, due to the influence of various factors such as temperature and moisture, after the asphalt pavement is put into use, under the influence of natural conditions and vehicle loads (especially when exposed to water), it will produce reflective cracks, stress cracks, temperature shrinkage cracks, potholes or damage and other pavement diseases, which greatly affect the service life of the asphalt pavement and increase the potential safety hazards of driving.

[0003] At present, the main remedial materials for potholes in asphalt pavements are hot patch materials and cold patch materials. The construction of hot patch materials requires heating of the hot patch materials, which consumes a lot of energy. There is a large temperature difference between the damaged area and the newly filled hot patch materials. If a heavy vehicle is crushed, the new and old materials will separate and cracks will occur again. In the construction of pothole repair, in order to ensure that the remedial materials have sufficient bonding strength with the old pavement and prevent rainwater from penetrating into the pavement and base along the interface, it is necessary to apply a tack coat on the bottom of the pit and the wall of the groove. Moreover, the use of hot patch materials to repair the pavement is suitable for pavement repair projects with concentrated locations and large engineering quantities, but it is very inconvenient for pavement repair projects with scattered and small engineering quantities: it is transported from the mixing plant to the site, and the temperature of the mixture gradually decreases during transportation; or the asphalt and aggregate need to be heated to 180°C and kept at high temperature to prevent the mixture from solidifying, but during transportation and storage, when kept at high temperature for a long time, the asphalt is prone to aging, and its softening point and viscosity increase, which may lead to a decrease in the quality of the hot patch materials and the quality of the repair, and increase energy consumption. Especially in spring and winter, the temperature is more restricted. For example, during the rainy season in the south, asphalt pavement damage is often serious, the maintenance workload is large, and it is inconvenient to use hot patch materials for repair.

[0004] Cold patch materials are easy to compact, ready to use, easy to store and simple to operate. They are suitable for any weather and environment, and do not require heating. They are easy to use and can be repaired quickly. However, due to the lack of evaluation indicators and corresponding test methods for the road performance of cold patch materials, their quality varies greatly, and the advantages of cold patch materials cannot be fully utilized. The quality of interface materials is not strict. Moreover, during the filling construction process, cold patch materials often require a longer curing time than hot patch materials. Therefore, it is necessary to close the road traffic and maintain the road in the early stage, which puts pressure on transportation and greatly increases maintenance costs. Summary of the invention

[0005] The present invention provides a quick remedial material for potholes in asphalt concrete pavement, which has short setting time, high strength, strong adhesion between the new and old interfaces, no need to add water during mixing, no need to close traffic during construction, can be opened to traffic immediately after construction, can be mixed and used at room temperature, is not affected by temperature and environment, has no toxic gas emissions, is safe and environmentally friendly, and has lower production cost, and a preparation method thereof.

[0006] In a first aspect, the present invention provides a method for preparing a rapid remedial material for potholes in an asphalt concrete pavement, comprising: providing a liquid material, the liquid material comprising road petroleum asphalt, an emulsifier aqueous solution, a polymer resin and a nano-additive material; providing a solid material, the solid material comprising an aggregate and cement; providing a mixing device, so that the liquid material and the solid material are in contact in the mixing device and stirred and mixed evenly to obtain the rapid remedial material for potholes in an asphalt concrete pavement; the mass of the liquid material is 5-20% of the mass of the solid material.

[0007] The quick remedial material of the present invention does not need to be mixed with water, and the components work synergistically with each other. The prepared quick remedial material has the characteristics of no need to close traffic, high early strength, good toughness, strong bonding force, strong durable impact resistance, and little environmental impact during construction. It can be mixed and used at room temperature and is not affected by air temperature and environment (it can also be used in winter). In the early stage of mixing, the strength is improved by the reaction between cement and water, and in the later stage, the strength is increased by the combined action of cement, polymer resin, nano-additive materials, etc. It can form strength by final setting within 60 minutes from mixing, and the strength can reach more than 80% of the final strength within 2 hours, and can meet the requirements of rapid traffic (strength ≥ 20MPa). In actual use, the time waiting for hardening can be used to clean and tidy up equipment and restore the site. It is almost unnecessary to close traffic to maintain and repair the potholes on the asphalt pavement, and it is particularly suitable for the repair of potholes on asphalt pavements with high traffic volume and serious overload.

[0008] Preferably, the preparation process of the liquid material is as follows: after heating the road petroleum asphalt to 135-145°C, add an emulsifier aqueous solution, a polymer resin and a nano additive material in sequence, and then send it into a high-speed colloid mill for shear stirring at a speed of 2000-3000rpm for 50-70min, and stir evenly to obtain the liquid material.

[0009] Preferably, in the preparation of the liquid material, based on 100 parts by weight of road petroleum asphalt, the amount of emulsifier aqueous solution added is 20-60 parts by weight, the amount of polymer resin added is 5-20 parts by weight, and the amount of nano additive material added is 3-20 parts by weight.

[0010] The emulsifier in the liquid material helps the road petroleum asphalt particles become fine, and also enhances the compatibility of polymer resins and nano-additives with road petroleum asphalt. Pre-mixing the components in the liquid material is conducive to the mixing, pouring and molding of the liquid material and the solid material. When the liquid material is mixed with the solid material, the components can be evenly distributed, and the workability and fluidity are better. The water contained in it can quickly contact with the cement and hydrate, shortening the final setting time and providing early strength. The synergistic effect of the components in the liquid material significantly improves the initial strength, final strength, water resistance and other road technical properties of the rapid remediation material.

[0011] Preferably, the above-mentioned road petroleum asphalt is road petroleum asphalt that meets the technical index requirements of Class A asphalt in "Technical Requirements for Road Petroleum Asphalt JTGF40-2004".

[0012] Preferably, the mass concentration of the emulsifier in the emulsifier aqueous solution is 1-30%; the emulsifier is one or more of anionic emulsifier, cationic emulsifier, amphoteric emulsifier and nonionic emulsifier. The emulsifier has good emulsification and permeability, can reduce the viscosity of road petroleum asphalt, and increase the mixing properties of liquid materials and solid materials.

[0013] Preferably, the polymer resin is an acrylic resin, and the acrylic resin is one or more of polyethylene glycol acrylate, epoxy acrylate, and polyurethane acrylate. The polymer resin can be well compatible with road petroleum asphalt, significantly improve the high / low temperature performance, viscosity and durability of road petroleum asphalt, enhance the mechanical properties of the repair structure, and ensure that the rapid remediation material can still obtain uniform, stable and excellent road performance under high or low temperature conditions, so as to expand the scope of use of the rapid remediation material and extend the service life of the asphalt pavement.

[0014] Preferably, the nano additive material is one or more of graphite, graphene, nanocellulose fiber, and carbon nanotube. Preferably, the length of the nano additive material does not exceed 1 mm. The nano additive material has the advantages of high strength, heat resistance, and chemical stability, and can reduce the free energy of road petroleum asphalt, thereby further improving the bonding effect between the liquid material and the solid material, which is beneficial to increase the stability of the material after mixing. By utilizing the characteristics of the nano additive material (such as small size effect and surface effect), filling it inside the material can also adjust its microstructure, improve the material's anti-rutting ability and anti-deformation ability, and effectively reduce the probability of secondary damage after asphalt road pothole repair.

[0015] Preferably, the solid material is prepared as follows: cement is added to the aggregate, and stirred at 100-300 rpm for 5-30 minutes, and the solid material is obtained by mixing; the amount of cement added is 1-20% of the mass of the aggregate. Cement is added to the solid material, and the cement can produce hydration with road petroleum asphalt, so that the rapid repair material can quickly harden and generate strength. It is applied to the repair of potholes on asphalt pavement, and the new and old asphalt pavements can be well bonded. The rapid repair material has better hydrophilicity and can be used in humid environments.

[0016] Preferably, the aggregate is one or more of limestone, sandstone and granite; the maximum particle size of the aggregate is not more than 10 mm, and the aggregate is continuously graded. The continuously graded aggregate plays a filling and force transmission role, which can increase the microstructure density of the rapid remediation material, improve the internal density, and improve the mechanical properties and durability of the formed repair structure.

[0017] Preferably, the cement is one or more of composite silicate cement, ordinary silicate cement, and sulphoaluminate cement, and the strength grade of the cement is not less than grade 32.5. Cement used as a gelling component can shorten the setting time of the rapid remedial material by its hydration effect, and quickly generate strength, which is conducive to rapid opening of traffic, achieving the purpose of rapid setting and shortening the closed traffic time.

[0018] In the second aspect, the present invention provides a rapid remedial material for potholes in asphalt concrete pavement, which is prepared by the aforementioned method for preparing rapid remedial material for potholes in asphalt concrete pavement. The rapid remedial material includes a liquid material part and a solid material part. The mass of the liquid material is 5-20% of the mass of the solid material, and the liquid material and the liquid material are mixed in proportion and then used in construction.

[0019] Preferably, the mass of the liquid material is 8-15% of the mass of the solid material.

[0020] The quick repair material of the present invention has good adhesion with asphalt concrete, can be directly mixed without adding water at room temperature, the construction temperature is not restricted, and traffic can be opened immediately after construction, which greatly alleviates the traffic pressure caused by road repair construction. No asphalt black smoke or waste is generated during production and construction, which is beneficial to environmental protection. The formed repair structure has excellent anti-aging performance and is not prone to undesirable phenomena such as cracking, which greatly prolongs the service life of the asphalt pavement. The quick repair material also exhibits adhesion with materials of different matrices such as cement concrete, metal surfaces, and wooden surfaces, and has a wide range of applications.

[0021] In a third aspect, the present invention also provides the use of the above-mentioned asphalt concrete pavement pothole quick remediation material in asphalt pavement construction. The quick remediation material of the present invention is used to construct and repair asphalt pavements, and can be widely used in the repair and maintenance of highways, bridge pavements, urban roads, parking lots, airport runways and other occasions. It has a wide applicable temperature range and can be constructed all-weather. The formed repair structure has strong compatibility with the original asphalt pavement, high strength, long service life, and can be opened to traffic immediately after the repair construction, without the need to close the traffic for a long time.

[0022] In a fourth aspect, the present invention further provides an asphalt pavement repair method, comprising: using the aforementioned asphalt concrete pavement pothole quick remediation material to repair the damaged part of the pavement. The quick remediation material of the present invention can timely repair potholes on the pavement, is not affected by weather, pothole size, and number, can be directly mixed at room temperature without adding water, and does not require heating and curing, is easy to construct and forms strength quickly, has good adhesion between the new and old interfaces, and has good durability and fatigue resistance, reduces the maintenance cost of the asphalt pavement, and has broad application prospects for asphalt pavement repair.

[0023] The asphalt concrete pavement pothole quick remediation material and preparation method thereof provided by the present invention achieve the following beneficial effects:

[0024] 1) The preparation method is simple, and the components synergistically improve the compatibility between the liquid material and the solid material, thereby improving their workability and fluidity, and synergistically shortening the setting time, and improving the road technical performance such as initial strength, final strength, and water resistance. It also ensures that the rapid remedial material can still obtain uniform and stable excellent road performance under high or low temperature conditions, effectively reducing the probability of secondary damage after asphalt pavement pothole repair, and expanding the scope of use.

[0025] 2) The rapid remedial material does not require the addition of water during mixing, has the characteristics of no need for closed traffic, high strength, good toughness, strong adhesion, strong durable impact resistance, and little impact from the environment during construction. It can be mixed and used at room temperature and is not affected by temperature and environment. The material is easy to carry and use, and the solvent used for preparation is water, which is cheaper, safer and more environmentally friendly. Compared with oily solvents, the production cost is lower.

[0026] 3) The rapid remedial material does not emit toxic gases when used, is safe and environmentally friendly, and is conducive to improving the efficiency of repair construction. It can form strength within 60 minutes from mixing, and the strength can reach more than 80% of the final strength within 2 hours. It can also meet the requirements for rapid traffic (strength ≥ 20MPa). Traffic can be opened immediately after construction, greatly alleviating the traffic pressure caused by road repair construction.

[0027] 4) The rapid remedial material can be mixed using existing equipment, and the construction is simple and convenient. It does not require heating and maintenance, which reduces the maintenance cost of asphalt pavement. The new and old interfaces have good adhesion, and the rapid repair, rapid traffic and rapid maintenance of asphalt pavement are achieved. The repair structure can make the asphalt pavement more stable and have better road performance, extending its service life. It is also suitable for the repair of different matrix materials such as asphalt pavement, cement concrete, metal surface, and wood surface. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present invention.

[0029] The following examples use conventional instruments and equipment in the art. Unless otherwise specified, the test materials and reagents used in the following examples can be obtained from commercial sources, and their specifications are conventional specifications in the art. If no specific techniques or conditions are specified in the following examples, they can be carried out according to the techniques or conditions described in the literature in the art or according to the product instructions.

[0030] It should be noted that, in the present invention and the following embodiments, concentrations, ratios, etc. not otherwise specified are all weight concentrations, weight ratios, etc., "%" means weight percentage, and "parts" means parts by weight, which are common writing habits used by those skilled in the art and are therefore not described in detail in the present invention.

[0031] As a preferred embodiment, the cationic emulsifier is a quaternary ammonium salt, and the quaternary ammonium salt is selected from one or more of octadecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, dodecyltrimethylammonium chloride, octadecyltrimethylammonium bromide, hexadecyltrimethylammonium bromide and dodecyltrimethylammonium bromide.

[0032] As a preferred embodiment, the anionic emulsifier is one or both of sodium dodecyl polyoxyethylene sulfate and calcium dodecylbenzene sulfonate.

[0033] As a preferred embodiment, the amphoteric emulsifier is one or more of disodium tallow iminodipropionate, disodium lauryliminodipropionate, sodium cocoylaminopropionate, cocoylaminopropionic acid, and laurylaminopropionic acid.

[0034] As a preferred embodiment, the nonionic emulsifier is one or more of castor oil polyoxyethylene ether, nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether, and triphenylethylphenol polyoxyethylene ether.

[0035] As an improvement to the above implementation, defoamer, water reducing agent and colorant are also added to the above solid material; the amount of the water reducing agent added is 1-2% of the mass of cement, the amount of the colorant added is 1-5% of the mass of cement, and the amount of the defoamer added is 1-3% of the mass of cement. The water reducing agent can improve the frost resistance of the rapid remediation material and avoid it from freezing and cracking or freeze-thaw loosening. The defoamer can play a defoaming role and is also beneficial to improve the strength of the repair structure. The colorant can reduce the color difference between the new and old asphalt pavements, and is added and adapted according to the color of the original asphalt pavement to improve the aesthetics of the repair structure.

[0036] As a preferred embodiment, the process of repairing the damaged part of the road surface with the rapid remediation material is as follows:

[0037] 1) Confirm the location and size of the pothole repair area, and remove the accumulated water, gravel, dust and other debris in the pothole. To enhance the appearance of the repair structure, a milling machine can be used to mill out the new and old interfaces or a cutting machine can be used to cut into rectangles along the repair window. The four sides of the rectangle should be perpendicular or parallel to the road markings. In emergency treatment, the potholes do not need to be milled, and the construction can be carried out as long as the damaged loose materials and debris in the potholes are removed.

[0038] 2) The solid material is fed into a mixing device, and then the liquid material is added into the solid material, and then mixed for 30-60 minutes at a stirring rate of 100-500 rpm to obtain a quick remedial material.

[0039] 3) Pour the mixed quick-remediation material into the cleaned potholes, fill them evenly, compact and level them, and the height of the compacted quick-remediation material should be 5-10mm higher than the original road surface. After the surface of the quick-remediation material is solidified and there is no obvious moisture, traffic can be opened.

[0040] It should be noted that the specific compaction method is not particularly limited in the present invention, and only the following examples are given: the compaction method for a larger area of ​​pits and grooves is to use a steel wheel roller or a vibrating roller; a small area of ​​pits and grooves can be compacted by a flat plate. The surface of the repaired structure after compaction is smooth and flat, and the surroundings and corners of the pits are not loose.

[0041] As a further improvement to the above implementation, the solid material also includes polyvinyl butyral and phosphogypsum, the amount of polyvinyl butyral added is 5-10% of the mass of cement, and the amount of phosphogypsum added is 1-5% of the mass of cement. When polyvinyl butyral is added too much, its adhesiveness is likely to affect the workability of the material; when phosphogypsum is added too much, its retarding ability is likely to affect the final setting time of the material; if the amount of both is too little, the effect is not significant. Therefore, within a specific addition range, the two can work synergistically, so that the liquid material and the solid material after mixing can be closely adhered, so that the aggregates with smaller particle size inside the material are not easy to lose, and the volatilization of the oil components in the road petroleum asphalt is slowed down, thereby improving the high temperature stability and deformation resistance of the repair structure, and also improving the water stripping resistance and water damage resistance of the repair structure, so that it can better adapt to areas with more precipitation.

[0042] It should be noted that the water reducing agent, coloring agent, and defoaming agent are commonly used materials in the art, and are not specifically limited or described in detail in the present invention. In a specific embodiment, the water reducing agent is preferably a polycarboxylic acid high-efficiency water reducing agent. The coloring agent is preferably carbon black. The defoaming agent is a P803 powder defoaming agent.

[0043] The present invention is further described in detail below in conjunction with the examples. However, it should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0044] In a specific embodiment, A-90 road petroleum asphalt whose technical indicators meet the "Technical Requirements for Road Petroleum Asphalt JTGF40-2004" is used, and the gradation particle size distribution scheme of the aggregate is shown in Table 1.

[0045] Table 1 Aggregate gradation table

[0046] Screen size mm 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 Screening rate% 100 96.3 73.2 55.2 35.2 15.3 14.3 9.2 6.3

[0047] Embodiment 1:

[0048] A method for preparing a quick remedial material for potholes in an asphalt concrete pavement comprises the following steps:

[0049] 1) After heating the road petroleum asphalt to 135°C, add the emulsifier aqueous solution, polymer resin and nano additive material in sequence, and then send it into a high-speed colloid mill for shear stirring at a speed of 2000 rpm for 60 minutes. Stir evenly to obtain a liquid material.

[0050] In the above preparation process, based on 100 parts by weight of road petroleum asphalt, the added amount of emulsifier aqueous solution is 20 parts by weight, the added amount of polymer resin is 5 parts by weight, and the added amount of nano additive material is 3 parts by weight.

[0051] In the above emulsifier aqueous solution, the mass concentration of the emulsifier is 5%; the above emulsifier is dodecyl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride, and hexadecyl trimethyl ammonium chloride in a mass ratio of 1:1:1. The polymer resin is polyethylene glycol acrylate. The nano additive material is graphene.

[0052] 2) Add cement to 1200 parts by weight of aggregate, stir at 100 rpm for 30 minutes, and mix to obtain a solid material. The amount of cement added is 3% of the mass of the aggregate. The aggregate is sandstone. The cement is sulphoaluminate cement with a strength grade of 32.5.

[0053] Embodiment 2:

[0054] A method for preparing a quick remedial material for potholes in an asphalt concrete pavement comprises the following steps:

[0055] 1) After heating the road petroleum asphalt to 145°C, add an emulsifier aqueous solution, a polymer resin and a nano additive material thereto in sequence, and then send it into a high-speed colloid mill for shear stirring at a speed of 3000 rpm for 70 minutes. Stir evenly to obtain a liquid material.

[0056] In the above preparation process, based on 100 parts by weight of road petroleum asphalt, the added amount of emulsifier aqueous solution is 60 parts by weight, the added amount of polymer resin is 20 parts by weight, and the added amount of nano additive material is 20 parts by weight.

[0057] The mass concentration of the emulsifier in the emulsifier aqueous solution is 30%; the emulsifier is calcium dodecylbenzene sulfonate. The polymer resin is epoxy acrylate. The nano additive material is graphite and carbon nanotubes in a mass ratio of 1:1.

[0058] 2) Add cement to 1200 parts by weight of aggregate, stir at 300 rpm for 10 minutes, and mix to obtain a solid material. The amount of cement added is 20% of the mass of the aggregate. The aggregate is granite. The cement is composite silicate cement with a strength grade of 42.5.

[0059] Embodiment 3:

[0060] A method for preparing a quick remedial material for potholes in an asphalt concrete pavement comprises the following steps:

[0061] 1) After heating the road petroleum asphalt to 135°C, add the emulsifier aqueous solution, polymer resin and nano additive material in sequence, and then send it into a high-speed colloid mill for shear stirring at a speed of 3000 rpm for 60 minutes. The liquid material is obtained by stirring evenly.

[0062] In the above preparation process, based on 100 parts by weight of road petroleum asphalt, the added amount of emulsifier aqueous solution is 60 parts by weight, the added amount of polymer resin is 10 parts by weight, and the added amount of nano additive material is 5 parts by weight.

[0063] In the above emulsifier aqueous solution, the mass concentration of the emulsifier is 5%; the above emulsifier is nonylphenol polyoxyethylene ether. The polymer resin is polyurethane acrylate. The nano additive material is nano cellulose fiber.

[0064] 2) Add 120 parts by weight of cement to 1200 parts by weight of aggregate, stir at 300 rpm for 20 minutes, and mix to obtain a solid material. The aggregate is limestone. The cement is ordinary Portland cement with a strength grade of 42.5.

[0065] Embodiment 4:

[0066] A method for preparing a quick remedial material for potholes in an asphalt concrete pavement comprises the following steps:

[0067] 1) After heating the road petroleum asphalt to 140°C, add the emulsifier aqueous solution, polymer resin and nano additive material in sequence, and then send it into a high-speed colloid mill for shear stirring at a speed of 2500rpm for 60 minutes. The liquid material is obtained by stirring evenly.

[0068] In the above preparation process, based on 100 parts by weight of road petroleum asphalt, the added amount of emulsifier aqueous solution is 50 parts by weight, the added amount of polymer resin is 15 parts by weight, and the added amount of nano additive material is 10 parts by weight.

[0069] In the above emulsifier aqueous solution, the mass concentration of the emulsifier is 8%; the above emulsifier is sodium coconut aminopropionate. The polymer resin is epoxy acrylate. The nano additive material is graphite and graphene with a mass ratio of 1:1.

[0070] 2) Add 240 parts by weight of cement to 1200 parts by weight of aggregate, stir at 300 rpm for 30 minutes, and mix to obtain a solid material. The aggregate is granite. The cement is ordinary Portland cement with a strength grade of 42.5.

[0071] Embodiment 5:

[0072] A method for preparing a quick remedial material for potholes in an asphalt concrete pavement comprises the following steps:

[0073] 1) After heating the road petroleum asphalt to 145°C, add the emulsifier aqueous solution, polymer resin and nano additive material in sequence, and then send it into a high-speed colloid mill for shear stirring at a speed of 3000 rpm for 60 minutes. Stir evenly to obtain a liquid material.

[0074] In the above preparation process, based on 100 parts by weight of road petroleum asphalt, the added amount of emulsifier aqueous solution is 50 parts by weight, the added amount of polymer resin is 20 parts by weight, and the added amount of nano additive material is 5 parts by weight.

[0075] In the above emulsifier aqueous solution, the mass concentration of the emulsifier is 8%; the above emulsifier is dodecyl trimethyl ammonium chloride, calcium dodecyl benzene sulfonate and sodium cocoyl amino propionate in a mass ratio of 1:1:1. The polymer resin is epoxy acrylate. The nano additive material is graphene and nano cellulose fiber in a mass ratio of 1:1.

[0076] 2) Add 120 parts by weight of cement to 1200 parts by weight of aggregate, stir at 300 rpm for 30 minutes, and mix to obtain a solid material. The aggregate is limestone. The cement is composite silicate cement with a strength grade of 42.5.

[0077] Embodiment 6:

[0078] A method for preparing a quick remedial material for potholes in an asphalt concrete pavement, which differs from Example 5 only in the following steps:

[0079] Step 2), add 120 parts by weight of cement, 1.2 parts by weight of defoamer, 2.4 parts by weight of water reducer and 2.4 parts by weight of colorant to 1200 parts by weight of aggregate, stir at 300 rpm for 30 minutes, and mix to obtain a solid material. The aggregate is limestone. The cement is composite silicate cement with a strength grade of 42.5.

[0080] Embodiment 7:

[0081] A method for preparing a quick remedial material for potholes in an asphalt concrete pavement, which differs from Example 5 only in the following steps:

[0082] Step 2), add 120 parts by weight of cement, 9 parts by weight of polyvinyl butyral and 3.6 parts by weight of phosphogypsum to 1200 parts by weight of aggregate, stir at 300 rpm for 30 minutes, and mix to obtain a solid material. The aggregate is limestone. The cement is composite silicate cement with a strength grade of 42.5.

[0083] Embodiment 8:

[0084] A method for repairing an asphalt pavement comprises the following steps:

[0085] 1) Confirm the location and size of the pothole repair area, and remove the accumulated water, gravel, dust and other debris in the pothole.

[0086] 2) The solid material prepared in the above embodiment is fed into a mixing device, and then the liquid material prepared in the above embodiment is added to the solid material, and then mixed for 30 minutes at a stirring rate of 500 rpm to obtain a rapid remedial material.

[0087] 3) Pour the mixed quick-remediation material into the cleaned potholes, fill them evenly, compact and level them, and the height of the compacted quick-remediation material should be 5-10mm higher than the original road surface. After the surface of the quick-remediation material is solidified and there is no obvious moisture, traffic can be opened.

[0088] Comparative Example 1:

[0089] A method for repairing an asphalt pavement comprises the following steps:

[0090] 1) Confirm the location and size of the pothole repair area, and remove the accumulated water, gravel, dust and other debris in the pothole.

[0091] 2) Add 120 parts by weight of cement, 50 parts by weight of emulsifier aqueous solution, 20 parts by weight of polymer resin and 5 parts by weight of nano additive to 1200 parts by weight of aggregate, then add 100 parts by weight of road petroleum asphalt heated to 145° C., and mix for 30 minutes at a stirring rate of 500 rpm to obtain a rapid remediation material.

[0092] The aggregate is limestone. The cement is composite silicate cement with a strength grade of 42.5. In the emulsifier aqueous solution, the mass concentration of the emulsifier is 8%; the emulsifier is dodecyltrimethylammonium chloride, calcium dodecylbenzenesulfonate and sodium coconut aminopropionate in a mass ratio of 1:1:1. The polymer resin is epoxy acrylate. The nano additive material is graphene and nanocellulose fiber in a mass ratio of 1:1.

[0093] 3) Pour the mixed quick-remediation material into the cleaned potholes, fill them evenly, compact and level them, and the height of the compacted quick-remediation material should be 5-10mm higher than the original road surface. After the surface of the quick-remediation material is solidified and there is no obvious moisture, traffic can be opened.

[0094] Comparative Example 2:

[0095] A method for preparing a quick remedial material for potholes in an asphalt concrete pavement, which differs from Example 5 only in the following steps:

[0096] Step 2), add 120 parts by weight of cement and 9 parts by weight of polyvinyl butyral to 1200 parts by weight of aggregate, stir at 300 rpm for 30 minutes, and mix to obtain a solid material. The aggregate is limestone. The cement is composite silicate cement with a strength grade of 42.5.

[0097] Comparative Example 3:

[0098] A method for preparing a quick remedial material for potholes in an asphalt concrete pavement, which differs from Example 5 only in the following steps:

[0099] Step 2), add 120 parts by weight of cement and 3.6 parts by weight of phosphogypsum to 1200 parts by weight of aggregate, stir at 300 rpm for 30 minutes, and mix to obtain a solid material. The aggregate is limestone. The cement is composite silicate cement with a strength grade of 42.5.

[0100] Test Example 1: Strength Test

[0101] Test method: Take the quick remedial materials prepared in Examples 3 to 5, mix them according to step 2 in Example 8, and make compacted specimens that meet standard specifications. At the same time, the quick remedial materials mixed in step 2 of Comparative Example 1 are also made into compacted specimens of the same specifications. According to the relevant tests in the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), the compressive strength and Marshall stability of the specimens are tested. The number of compactions is 50, and the timing starts from the beginning of mixing after the liquid material and the solid material are mixed. Each specimen is set with 3 parallels, and the average value is taken. The results are shown in Tables 2 and 3.

[0102] Table 2

[0103]

[0104] Table 3

[0105]

[0106] In order to make the repair structure withstand the wheel load and avoid the formation of rutting-like defects due to the low strength and displacement and congestion at the concentrated force of the wheel load, the quick remedial material must reach a certain strength after compaction and meet the requirements of rapid traffic (strength ≥ 20MPa) to ensure that traffic is not closed. From the test results, it can be seen that the quick remedial material of the present invention can be finally set to form strength 60 minutes after mixing, and the strength can reach more than 80% of the final strength within 2 hours, and can meet the requirements of rapid traffic (strength ≥ 20MPa). In actual use, the time waiting for hardening can be used to clean and tidy up the equipment and restore the site, and the asphalt pavement potholes can be maintained and repaired almost without closing the traffic. Compared with Comparative Example 1, the components in the liquid material are mixed together in advance in the present invention, which is conducive to the mixing, pouring and molding of the liquid material and the solid material, and is also conducive to improving the setting time and strength growth of the repair structure.

[0107] Test Example 2: Road Performance Test

[0108] Test method: Take the quick remedial materials prepared in Example 5, Example 7 and Comparative Example 2 and Comparative Example 3, mix them according to step 2 in Example 8, and make compacted specimens that meet standard specifications. According to the submerged Marshall test and rutting test in the "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering" (JTG E20-2011), test the residual stability and dynamic stability of the specimens after 48 hours of submersion in water. Each specimen is set with 3 parallels, and the average value is taken. The results are shown in Table 4.

[0109] Table 4

[0110] Example 5 Example 7 Comparative Example 2 Comparative Example 3 30min stability / KN 15.32 18.14 15.67 17.26 48h stability / KN 12.84 16.41 13.22 14.98 Residual stability / % 83.79 90.47 84.36 86.92 45min deformation / mm 3.102 2.951 3.082 3.074 60min deformation / mm 3.462 3.236 3.406 3.421 Dynamic stability / times / mm 2846.2 3595.2 3162.4 2952.8

[0111] From the test results, it can be seen that the dynamic stability of Example 7 is significantly increased, indicating that polyvinyl butyral and phosphogypsum within a specific addition range are effective in improving the high-temperature stability of rapid remedial materials and repair structures, and the synergistic effect of the two is significant. Similarly, the residual stability of Example 7 is the highest, reaching more than 90%, indicating that the water stability of the repair structure formed by it is optimal. In summary, it can be seen that polyvinyl butyral and phosphogypsum within a specific addition range can synergistically improve the high-temperature stability and deformation resistance of the repair structure, and also improve the water stripping resistance and water damage resistance of the repair structure, so that it can better adapt to areas with more precipitation.

[0112] It should be noted that in the present invention, the detailed steps of some operations are not described in detail, but belong to the prior art known to those skilled in the art, so they will not be repeated here. In addition, in the present invention, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are only for simplicity and convenience. Accordingly, the description of numerical ranges or percentage ranges should be deemed to have covered and specifically disclosed all possible secondary ranges and individual values ​​(including integers and fractions) within the range.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. In the present invention, not all possible combinations of the various technical features in the various embodiments or embodiments are described. As long as there is no contradiction in the combination of these technical features, the various technical features in the various embodiments or embodiments can be arbitrarily combined, and all possible combinations should be considered to be within the scope of this specification. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a quick remedial material for potholes in asphalt concrete pavement, characterized in that: include: Providing liquid materials, wherein the liquid materials include road petroleum asphalt, emulsifier aqueous solution, polymer resin and nano additive material; providing a solid material, the solid material comprising aggregate and cement; Providing a mixing device so that the liquid material and the solid material are in contact with each other in the mixing device and are stirred and mixed evenly to obtain the asphalt concrete pavement pothole quick remediation material; The preparation process of the liquid material is as follows: after heating the road petroleum asphalt to 135-145° C., an emulsifier aqueous solution, a polymer resin and a nano additive material are added thereto in sequence, and then the mixture is sent to a high-speed colloid mill for shear stirring at a speed of 2000-3000 rpm for 50-70 minutes, and the liquid material is obtained after stirring evenly; in the preparation process of the liquid material, based on 100 parts by weight of the road petroleum asphalt, the amount of the emulsifier aqueous solution added is 20-60 parts by weight, the amount of the polymer resin added is 5-20 parts by weight, and the amount of the nano additive material added is 3-20 parts by weight; The preparation process of the solid material is as follows: adding cement to the aggregate, stirring at 100-300 rpm for 5-30 minutes, and mixing to obtain the solid material; the amount of cement added is 1-20% of the mass of the aggregate; The polymer resin is an acrylic resin, and the acrylic resin is one or more of polyethylene glycol acrylate, epoxy acrylate, and polyurethane acrylate; The nano additive material is one or more of graphite, graphene, nanocellulose fiber, and carbon nanotube, and the length of the nano additive material does not exceed 1 mm; The solid material also includes polyvinyl butyral and phosphogypsum, the amount of polyvinyl butyral added is 5-10% of the mass of cement, and the amount of phosphogypsum added is 1-5% of the mass of cement; The mass of the liquid material is 8-15% of the mass of the solid material; The preparation process of the asphalt concrete pavement pothole rapid remediation material is as follows: the solid material is fed into the mixing device, the liquid material is added to the solid material, and then mixed for 30-60 minutes at a stirring rate of 100-500rpm to obtain the asphalt concrete pavement pothole rapid remediation material.

2. The method for preparing the asphalt concrete pavement pothole quick remediation material according to claim 1, characterized in that: In the emulsifier aqueous solution, the mass concentration of the emulsifier is 1-30%; the emulsifier is one or more of anionic emulsifier, cationic emulsifier, amphoteric emulsifier and nonionic emulsifier.

3. The method for preparing the asphalt concrete pavement pothole quick remediation material according to claim 1, characterized in that: The aggregate is one or more of limestone, sandstone and granite; the maximum particle size of the aggregate is not greater than 10 mm and is continuously graded.

4. The method for preparing the asphalt concrete pavement pothole quick remediation material according to claim 1, characterized in that: The cement is one or more of composite silicate cement, ordinary silicate cement and sulphoaluminate cement, and the strength grade of the cement is not less than grade 32.

5.

5. The method for preparing the asphalt concrete pavement pothole quick remediation material according to claim 1, characterized in that: Defoamer, water reducing agent and colorant are also added to the solid material; the addition amount of the water reducing agent is 1-2% of the cement mass, the addition amount of the colorant is 1-5% of the cement mass, and the addition amount of the defoamer is 1-3% of the cement mass.

6. A rapid remedial material for potholes in asphalt concrete pavement, prepared by the method for preparing a rapid remedial material for potholes in asphalt concrete pavement according to any one of claims 1 to 5, characterized in that: The quick remedial material comprises a liquid material part and a solid material part, the mass of the liquid material is 8-15% of the mass of the solid material, and the liquid material and the solid material are mixed in proportion and then used for construction.

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