A road marking crack-retarding material, structure and application method for cold areas with large temperature differences

Abstract

The present invention discloses a crack-retarding material, structure and application method for road marking in cold areas with large temperature differences, and relates to the technical field of pavement materials. The present invention adopts high-viscosity emulsified asphalt as a crack-retarding material component, and the raw materials of high-viscosity emulsified asphalt include the following components by mass: 100 parts of base asphalt, 7 to 10 parts of modifier, 0.6 to 1.0 parts of solubilizer, 0.7 to 1.5 parts of plasticizer, 0.2 to 0.6 parts of stabilizer, 64.8 to 66.6 parts of water, 3.5 to 6.2 parts of emulsifier, 0.4 to 0.9 parts of co-emulsifier and 1.8 to 3.5 parts of pH regulator. The crack-retarding material prepared by the present invention has the advantages of strong adhesion and outstanding low-temperature crack resistance. It can be used for asphalt pavement crack repair and as a crack-retarding material for road markings. The high-viscosity emulsified asphalt is mixed with fiber to form a new crack-retarding structural layer, which has broad application prospects in the maintenance and repair of road markings in cold areas with large temperature differences.

Description

Technical Field

[0001] The present invention relates to the technical field of pavement materials, and in particular to a road marking crack-mitigating material, structure and application method in cold areas with large temperature differences. Background Art

[0002] As a vital component of asphalt pavement infrastructure, road markings are subject to environmental factors such as temperature, humidity, oxygen, and ultraviolet radiation during their service life, causing them to deteriorate, crack, and peel. In cold northern regions, where winter temperature swings are significant, road marking cracking is even more severe. This cracking is often accompanied by top-to-bottom cracks in the road markings and the asphalt material due to load and temperature stress. These cracks can reach depths of 1-2 cm. These fine, top-to-bottom cracks can allow moisture to penetrate the asphalt pavement, causing volume expansion at low temperatures, increasing the risk of structural damage and ultimately impacting the durability and safety of the asphalt pavement. Furthermore, due to base deformation and poor construction quality, reflective cracks can develop from bottom to top during asphalt pavement service. These cracks not only allow new marking material to penetrate the cracks during application, compromising construction quality, but also cause localized stress concentrations in the markings due to cracks in the underlying layer, accelerating cracking.

[0003] In view of this, there is an urgent need for a crack-reducing material and structural layer for road markings in cold regions with large temperature differences. This crack-reducing material should have strong flexibility and good low-temperature performance to treat cracks in asphalt pavements, improve the serviceability of the original pavement, and provide good service conditions for road markings. At the same time, a crack-reducing structural layer can be set based on this crack-reducing material. The structural layer should have good low-temperature crack resistance and be adaptable to cold climates with large temperature differences. This can slow the upward development of reflective cracks in the asphalt pavement to the marking surface, and can also prevent cracks in the road marking from damaging the underlying structure, thereby improving the durability and safety of both the asphalt pavement and the road marking. Summary of the Invention

[0004] The purpose of the present invention is to provide a road marking crack-retarding material, structure and application method for cold areas with large temperature differences, so as to solve the problems existing in the above-mentioned prior art, thereby improving the original road surface condition and reducing the mutual adverse effects between road markings and asphalt pavement during service, thereby improving the coating quality and service life of the new markings.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] One of the technical solutions of the present invention is to provide a high-viscosity emulsified asphalt, the raw materials of which include the following components in parts by mass: 100 parts of base asphalt, 7 to 10 parts of modifier, 0.6 to 1.0 parts of solubilizer, 0.7 to 1.5 parts of plasticizer, 0.2 to 0.6 parts of stabilizer, 64.8 to 66.6 parts of water, 3.5 to 6.2 parts of emulsifier, 0.4 to 0.9 parts of co-emulsifier and 1.8 to 3.5 parts of pH regulator.

[0007] The base asphalt is road petroleum asphalt, preferably one of No. 70 road petroleum asphalt or No. 90 road petroleum asphalt. The modifier is one of SBS791, SBS791E, SBS792, or SBS792E. The solubilizer is one of furfural extract oil, furfural, or vegetable oil. The plasticizer is one of dioctyl phthalate or dibutyl phthalate. The stabilizer is one of sulfur, sulfur monochloride, or benzoyl peroxide.

[0008] As a further preferred embodiment of the present invention, the emulsifier is a slow-cracking, fast-setting cationic asphalt emulsifier; the co-emulsifier is a mixture of anhydrous calcium chloride and sodium carboxymethyl cellulose; and the pH regulator is hydrochloric acid.

[0009] As a further preferred embodiment of the present invention, the mass ratio of anhydrous calcium chloride to sodium carboxymethyl cellulose is 2-3:1.

[0010] The second technical solution of the present invention is to provide a method for preparing the above-mentioned high-viscosity emulsified asphalt, comprising the following steps:

[0011] (1) After the base asphalt is heated and softened, it is mixed with the modifier, solubilizer and plasticizer, and the obtained mixture is subjected to a pre-swelling treatment;

[0012] (2) subjecting the material obtained in step (1) to a first shearing treatment, adding the stabilizer, and then subjecting the material to a second shearing treatment;

[0013] (3) subjecting the material obtained in step (2) to heat preservation and curing treatment to obtain high-viscosity modified asphalt;

[0014] (4) adding the co-emulsifier and emulsifier to water, and adjusting the pH to 2-2.5 with a pH regulator to obtain a soap solution;

[0015] (5) The soap solution of step (4) is subjected to a third shearing treatment, and then the modified asphalt is added and subjected to a fourth shearing treatment to obtain the high-viscosity emulsified asphalt.

[0016] Furthermore, the pre-swelling treatment is performed at a temperature of 170-200° C. and for a time of 10-20 minutes.

[0017] Furthermore, the rotation speed of the first shearing treatment is 7000-9000 r / min, and the time is 60-90 min; the rotation speed of the second shearing treatment is 2000-4000 r / min, and the time is 60-90 min.

[0018] Furthermore, the temperature of the heat preservation and health treatment is 170-190° C., and the time is 2-4 hours.

[0019] Furthermore, the rotation speed of the third shearing treatment is 1500~2500r / min, and the time is 30~60s; the rotation speed of the fourth shearing treatment is 3500~6000r / min, and the time is 3~5min.

[0020] Furthermore, in step (4), the temperature of the water is 60-70°C.

[0021] Furthermore, in step (5), before performing the third shearing treatment, the soap solution is also preheated at a temperature of 60-80°C.

[0022] Furthermore, after adding the modified asphalt, the system temperature for the fourth shearing treatment is 180-200°C.

[0023] Furthermore, the heating softening temperature of the matrix asphalt is 120~150℃.

[0024] The designed solid content of the high-viscosity emulsified asphalt of the present invention is 60%.

[0025] The third technical solution of the present invention is to provide the application of the above-mentioned high-viscosity emulsified asphalt in repairing cracks in asphalt pavements in cold areas with large temperature differences and in preparing a crack-mitigating structural layer for road markings and pavements. It is suitable for cold areas with large temperature differences of -15 to 30°C.

[0026] A fourth technical solution of the present invention provides a method for improving the performance of road marking pavement by utilizing a crack-reducing structural layer, wherein a mixture of fiber and the high-viscosity emulsified asphalt is used as the crack-reducing structural layer;

[0027] The slow-cracking structural layer is arranged between the asphalt pavement surface and the road markings, and a primer is provided on the surface of the slow-cracking structural layer. The thickness of the slow-cracking structural layer is 2-3 mm.

[0028] As a further preferred embodiment of the present invention, the fibers are glass fibers and / or basalt fibers.

[0029] A fifth technical solution of the present invention provides a method for repairing a road marking surface, comprising the following steps:

[0030] (1) Milling old road markings: Mill the old road markings, and control the milling depth to 1~2mm below the markings to ensure that the old markings are completely removed. At the same time, the edges of the markings should also be processed to ensure uniform milling;

[0031] (2) Construction preparation: remove debris, soil and loose materials from the surface of the asphalt pavement to ensure that the surface layer is clean, conduct a detailed inspection of the cracks in the surface layer, and assess the width and depth of the cracks;

[0032] (3) Surface treatment: Use the highly viscous emulsified asphalt (modified emulsified asphalt) to fill the gaps in the road surface, maintain the surface until the emulsified asphalt breaks and forms strength, and then carry out subsequent construction after solidification;

[0033] (4) constructing a slow-cracking structural layer: applying a mixture of the high-viscosity emulsified asphalt (modified emulsified asphalt) and the fiber to the asphalt surface layer to obtain a slow-cracking structural layer;

[0034] (5) Maintenance treatment: During the emulsified asphalt demulsification period, open traffic and heavy objects should be avoided on the newly laid slow-cracking structural layer to keep it moist to improve performance.

[0035] (6) After the crack-retarding structural layer is solidified and the structural layer is ensured to be flat and free of defects, a primer is applied and new road markings are laid.

[0036] During the demulsification period of emulsified asphalt, open traffic and heavy objects should be avoided on the newly laid slow-cracking structural layer to keep it moist to improve performance.

[0037] As a further preferred embodiment of the present invention, the method for constructing the crack mitigation structural layer comprises the following steps:

[0038] a. Applying the first layer of emulsified asphalt: spray the high-viscosity emulsified asphalt (modified emulsified asphalt) onto the asphalt surface layer according to the designed thickness to obtain the first layer of emulsified asphalt;

[0039] b. Fiber material laying: Evenly lay fiber material on the wet first layer of high-viscosity emulsified asphalt (emulsified asphalt layer);

[0040] c. Second layer of emulsified asphalt coating: Apply a second layer of high-viscosity emulsified asphalt (emulsified asphalt) on the fiber material to build a slow-cracking structural layer.

[0041] The present invention discloses the following technical effects:

[0042] The present invention provides a road marking crack-retarding material for cold areas with large temperature differences. The material has a simple preparation process, good storage stability, excellent adhesion, strong flexibility and ductility, is suitable for cold areas, and has excellent comprehensive performance.

[0043] The present invention provides a road marking crack-retarding material for cold areas with large temperature differences. The material has good fluidity at room temperature, strong applicability to low-temperature and humid environments, fast construction speed and good construction quality, and avoids the energy consumption and environmental pollution of conventional modified asphalt during the construction process.

[0044] The present invention further adds fiber material to the crack-reducing material and uses it as a crack-reducing structural layer for road markings. The porous structure and texture characteristics of the fiber can form a stable structure with the emulsified asphalt, and can absorb and disperse the stress of the crack-reducing structural layer caused by temperature changes and loads under stress. At the same time, the fiber has the characteristics of high modulus and high tensile strength, which enhances the flexibility of the crack-reducing structural layer and improves its deformation resistance and tensile strength in cold areas with large temperature differences.

[0045] The present invention combines crack-reducing materials with fibers to form a crack-reducing structural layer. Its excellent stress relaxation ability can delay the upward development of reflective cracks and fatigue cracks in asphalt pavements, and effectively avoid cracking of the underlying pavement surface layer caused by cracking of the markings. It improves the durability and safety of both the asphalt pavement and the road markings, and has broad application prospects in the maintenance and repair of road markings in cold areas with large temperature differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 This is a schematic diagram of the road marking repair structure of the present invention. DETAILED DESCRIPTION

[0048] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0049] In the following examples and comparative examples of the present invention, the emulsifier used is the slow-cracking, fast-setting cationic asphalt emulsifier provided by Shengquan Company, the co-emulsifiers used are anhydrous calcium chloride and sodium carboxymethyl cellulose, both of which have a purity greater than 95%; the pH regulator used is hydrochloric acid with a concentration of 1.0 mol / L.

[0050] Example 1

[0051] A high-viscosity emulsified asphalt, the raw material mass ratio is as follows:

[0052] 100 parts of 70# base asphalt, 7 parts of SBS791, 0.6 parts of furfural extracted oil, 0.7 parts of dioctyl phthalate, 0.2 parts of sulfur monochloride, 66.6 parts of water, 0.4 parts of co-emulsifier, 3.5 parts of emulsifier and 1.8 parts of hydrochloric acid, wherein the co-emulsifier is compounded with anhydrous calcium chloride and sodium carboxymethyl cellulose in a mass ratio of 3:1.

[0053] The preparation method of the above-mentioned high-viscosity emulsified asphalt is as follows:

[0054] Step 1: After heating 70# matrix asphalt to 135℃, add SBS791, furfural extracted oil and dioctyl phthalate, and place the mixed binder in an oil bath at 180℃ to heat and swell for 10 minutes;

[0055] Step 2: The mixed binder was sheared at a shear rate of 7000 r / min for 60 min using a high-speed shear instrument, during which sulfur monochloride was added in small amounts and multiple times. The shear rate was then reduced to 2500 r / min for 60 min.

[0056] Step 3: After shearing, the asphalt is cured at 170°C for 2 hours to obtain a high-viscosity modified asphalt.

[0057] Step 4: Heat water to 65°C, add the co-emulsifier and emulsifier in sequence and stir evenly, then adjust the pH to 2.5 with hydrochloric acid to obtain soap solution;

[0058] Step 5: Preheat the colloid mill to 60°C, add soap solution, and shear at a shear rate of 2000 r / min for 30 s.

[0059] Step 6: Pour the 175°C high-viscosity modified asphalt into the colloid mill, and at the same time increase the shear rate of the colloid mill to 4000r / min and the grinding time to 3min to obtain high-viscosity emulsified asphalt.

[0060] Example 2

[0061] A high-viscosity emulsified asphalt, the raw material mass ratio is as follows:

[0062] 100 parts of 90# base asphalt, 8 parts of SBS791E, 0.7 parts of furfural, 0.9 parts of dibutyl phthalate, 0.3 parts of sulfur, 66.2 parts of water, 0.6 parts of co-emulsifier, 4.4 parts of emulsifier and 2.1 parts of hydrochloric acid; the co-emulsifier is compounded with anhydrous calcium chloride and sodium carboxymethyl cellulose in a mass ratio of 3:1.

[0063] The preparation method of the above-mentioned high-viscosity emulsified asphalt is as follows:

[0064] Step 1: After heating 90# matrix asphalt to 135℃, add SBS791E, furfural and dibutyl phthalate, and place the mixed binder in an oil bath at 180℃ to heat and swell for 10 minutes;

[0065] Step 2: Shear the mixed binder at a shear rate of 7500 r / min for 60 min using a high-speed shear instrument, during which sulfur is added in small amounts and multiple times. The shear rate is then reduced to 3000 r / min and sheared for 60 min.

[0066] Step 3: After shearing, the asphalt was cured at 175°C for 2.5 hours to obtain a high-viscosity modified asphalt.

[0067] Step 4: Heat water to 65°C, add the co-emulsifier and emulsifier in sequence and stir evenly, then adjust the pH to 2.5 with hydrochloric acid to obtain soap solution;

[0068] Step 5: Preheat the colloid mill to 65°C, add soap solution, and shear at a shear rate of 2000 r / min for 30 s.

[0069] Step 6: Pour the 180°C high-viscosity modified asphalt into the colloid mill, and at the same time increase the shear rate of the colloid mill to 4500r / min and the grinding time to 3min to obtain high-viscosity emulsified asphalt.

[0070] Example 3

[0071] A high-viscosity emulsified asphalt, the raw material mass ratio is as follows:

[0072] 100 parts of 90# base asphalt, 9 parts of SBS792, 0.8 parts of vegetable oil, 1.2 parts of dibutyl phthalate, 0.4 parts of benzoyl peroxide, 65.4 parts of water, 0.7 parts of co-emulsifier, 5.3 parts of emulsifier and 2.8 parts of hydrochloric acid; the co-emulsifier is compounded with anhydrous calcium chloride and sodium carboxymethyl cellulose in a mass ratio of 2:1.

[0073] The preparation method of the above-mentioned high-viscosity emulsified asphalt is as follows:

[0074] Step 1: After heating 90# matrix asphalt to 135℃, add SBS792, vegetable oil and dibutyl phthalate, and place the mixed binder in an oil bath at 180℃ to heat and swell for 15 minutes;

[0075] Step 2: The mixed binder obtained in step 1 was sheared at a shear rate of 8000 r / min for 75 min using a high-speed shear instrument, during which benzoyl peroxide was added in small amounts and multiple times, and then the shear rate was reduced to 3000 r / min and sheared for 75 min;

[0076] Step 3: After shearing, the asphalt is cured at 175°C for 3 hours to obtain a high-viscosity modified asphalt.

[0077] Step 4: Heat water to 65°C, add the co-emulsifier and emulsifier in sequence and stir evenly, then adjust the pH to 2.3 with hydrochloric acid to obtain soap solution;

[0078] Step 5: Preheat the colloid mill to 75°C, add soap solution, and shear at a shear rate of 2000 r / min for 30 s.

[0079] Step 6: Pour the 185°C high-viscosity modified asphalt into the colloid mill, and at the same time increase the shear rate of the colloid mill to 5000 r / min and the grinding time to 4 minutes to obtain high-viscosity emulsified asphalt.

[0080] Example 4

[0081] A high-viscosity emulsified asphalt, the raw material mass ratio is as follows:

[0082] 100 parts of 70# matrix asphalt, 10 parts of SBS792E, 1 part of furfural extracted oil, 1.5 parts of dibutyl phthalate, 0.6 parts of sulfur monochloride, 64.8 parts of deionized water, 0.9 parts of co-emulsifier, 6.2 parts of emulsifier and 3.5 parts of hydrochloric acid; the co-emulsifier is compounded with anhydrous calcium chloride and sodium carboxymethyl cellulose in a mass ratio of 2:1.

[0083] The preparation method of the above-mentioned high-viscosity emulsified asphalt is as follows:

[0084] Step 1: After heating 70# matrix asphalt to 135℃, add SBS792E, furfural extracted oil and dibutyl phthalate in sequence, and place the mixed binder in an oil bath at 190℃ to heat and swell for 20 minutes;

[0085] Step 2: The mixed binder was sheared at a shear rate of 9000 r / min for 90 min using a high-speed shear instrument, during which sulfur monochloride was added in small amounts and multiple times. The shear rate was then reduced to 3000 r / min for another 90 min.

[0086] Step 3: After shearing, the asphalt is cured at 190°C for 3 hours to obtain a high-viscosity modified asphalt.

[0087] Step 4: Heat water to 70°C, add co-emulsifier and emulsifier in sequence and stir evenly, then adjust the pH to 2 with hydrochloric acid to obtain soap solution;

[0088] Step 5: Preheat the colloid mill to 80°C, add soap solution, and shear at a shear rate of 2500 r / min for 60 s.

[0089] Step 6: Pour the 190°C high-viscosity modified asphalt into the colloid mill, and at the same time increase the shear rate of the colloid mill to 5500r / min and the grinding time to 5min to obtain high-viscosity emulsified asphalt.

[0090] Example 5

[0091] The present invention provides a conventional modified emulsified asphalt. For comparison with Examples 1 to 4, the raw material mass ratios are as follows:

[0092] 100 parts of 70# base asphalt, 6 parts of SBS791E, 0.5 parts of furfural extracted oil, 0.2 parts of sulfur, 66.2 parts of water, 3.5 parts of emulsifier, 0.3 parts of anhydrous calcium chloride and 1.4 parts of hydrochloric acid.

[0093] The above conventional modified emulsified asphalt preparation method is as follows:

[0094] Step 1: After heating 70# matrix asphalt to 135℃, add SBS791E and furfural extraction oil in sequence, and place the mixed binder in an oil bath at 170℃ to heat and swell for 10 minutes;

[0095] Step 2: The mixed binder was sheared at a shear rate of 7000 r / min for 20 min using a high-speed shear instrument, during which sulfur was added in small amounts and multiple times. The shear rate was then reduced to 2000 r / min for 90 min.

[0096] Step 3: After shearing, the asphalt was cured at 170°C for 2 hours to obtain modified asphalt;

[0097] Step 4: Heat water to 60°C, add anhydrous calcium chloride and emulsifier in sequence and stir evenly, then adjust the pH to 2.5 with hydrochloric acid to obtain soap solution;

[0098] Step 5: Preheat the colloid mill to 60°C, add soap solution, and shear at a shear rate of 2000 r / min for 30 s.

[0099] Step 6: Pour the modified asphalt at 170°C into the colloid mill, increase the shear rate of the colloid mill to 3500r / min, and grind for 3 minutes to obtain modified emulsified asphalt.

[0100] The 60°C dynamic viscosity, solid content, storage stability, and physical properties of the modified emulsified asphalts after demulsification in Examples 1 to 5 were tested, and the technical properties are shown in Table 1.

[0101] Table 1 Technical performance

[0102]

[0103] The modifier disperses within the asphalt to form a three-dimensional network structure, restricting the movement of continuous-phase asphalt molecules and dispersing the shrinkage stress of the asphalt molecules at low temperatures, resulting in excellent low-temperature performance for the crack-mitigating material. The test results in Table 1 demonstrate that the high-viscosity emulsified asphalt prepared by this invention exhibits excellent adhesion and stability. Its dynamic viscosity at 60°C exceeds 20,000 Pa·s, and its low-temperature ductility far exceeds the standard requirement of 20 cm. This demonstrates excellent ductility, outstanding tensile strength in cold environments, and superior overall performance.

[0104] A small beam bending test and a direct pull-out test were designed to evaluate the performance of the crack-mitigating structural layer material at low and high temperatures. The test temperatures were -15°C and 30°C.

[0105] Effect verification example 1:

[0106] The specific method for the small beam bending test is as follows: 100 parts by mass of aggregate, 9 parts of the modified emulsified asphalt prepared in Examples 1-5, 3 parts of cement, 6 parts of water, and 3 parts of mineral powder are mixed and compacted to form rutting plate specimens measuring 300 mm long, 300 mm wide, and 50 mm thick. AC-13 grading and PO42.5 ordinary Portland cement are used. After curing at room temperature for 28 days, the rutting plate specimens are cut into small beam specimens measuring 250 mm long, 30 mm wide, and 35 mm high. The flexural strain and flexural stiffness modulus of these small beam specimens are tested using a universal testing machine (UTM), labeled as Effective Examples 1-5.

[0107] 8% by weight of fiber was added to the emulsified asphalt of Examples 1-5, respectively, to form Comparative Examples 1-5 (glass fiber was added to Comparative Examples 1, 3, and 5, and basalt fiber was added to Comparative Examples 2 and 4). Comparative Examples 1-5 were subjected to the same beam bending test as Examples 1-5, and are labeled as Effective Examples 6-10, respectively.

[0108] Effect verification example 2:

[0109] The specific implementation method of the direct pull-out test is as follows: cut a limestone with a length of 50 mm, a width of 50 mm, and a thickness of 10 mm, and add the modified emulsified asphalt prepared in Examples 1 to 5 at a pressure of 1.2 kg / m 2 The amount of emulsified asphalt was applied on the limestone, and the thickness of the emulsified asphalt layer was controlled at 0.2 mm. Then, two pieces of limestone coated with emulsified asphalt were aligned and bonded together to make a tensile specimen with a length of 50 mm × a width of 50 mm × a thickness of 20 mm. After curing for 72 hours, the tensile strength and tensile elongation of the tensile specimen were tested using a universal testing machine UTM, which were marked as effect examples 11-15.

[0110] When the modified emulsified asphalt of Examples 1-5 is applied on limestone, the fibers are evenly spread and the amount of fibers used is 100 g / m 2Emulsified asphalt and fibers should be added in multiple layers to ensure that the fibers are completely dispersed in the emulsified asphalt. These are shown in Comparative Examples 6-10 (glass fibers were added to Comparative Examples 6, 8, and 10, and basalt fibers were added to Comparative Examples 7 and 9). Comparative Examples 6-10 were subjected to direct pull-out tests under the same conditions and are labeled as Effective Examples 16-20.

[0111] The flexural strain, flexural modulus, tensile strength and tensile elongation at -15°C and 30°C are shown in Table 2, Table 3, Table 4 and Table 5, respectively.

[0112] Table 2 Bending strain and bending stiffness modulus at -15℃

[0113]

[0114] Table 3 Tensile strength and tensile elongation at -15℃

[0115]

[0116] Table 4 Bending strain and bending stiffness modulus at 30℃

[0117]

[0118] Table 5 Tensile strength and elongation at 30°C

[0119]

[0120] It can be seen that the de-cracking structural layer based on high-viscosity emulsified asphalt of the present invention has excellent flexural strain and flexural stiffness modulus at both low and high temperatures. The fibers can increase the tensile strength and tensile elongation of the de-cracking structural layer, effectively reduce the occurrence of pavement cracks, and improve the deformation resistance and stress relaxation ability of the de-cracking structural layer in cold areas with large temperature differences.

[0121] This invention prepares emulsified asphalt from high-viscosity modified asphalt, achieving satisfactory storage stability, strong adhesion, excellent flexibility, and a wide range of applications. It can be used as a repair material for old pavements in cold regions. Combining fiber with the high-viscosity emulsified asphalt forms a crack-retarding structural layer with strong deformation resistance and high tensile strength. This layer is adaptable to cold regions with wide temperature ranges from -15°C to 30°C, improving the durability and safety of both asphalt pavement and road markings.

[0122] The above embodiments are merely examples for clarification and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications may be made based on the above descriptions. It is not necessary and impossible to enumerate all implementation methods here, and any obvious variations or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A method for improving the performance of road marking pavement using a slow-cracking structural layer, characterized in that: A mixture of fiber and high-viscosity emulsified asphalt is used as a de-crack structural layer; the mass ratio of the high-viscosity emulsified asphalt to the fiber is 10-20:1, and the de-crack structural layer is arranged between the asphalt pavement surface and the road markings; The raw materials of the high-viscosity emulsified asphalt include the following components in parts by mass: 100 parts of base asphalt, 7-10 parts of modifier, 0.6-1.0 parts of solubilizer, 0.7-1.5 parts of plasticizer, 0.2-0.6 parts of stabilizer, 64.8-66.6 parts of water, 3.5-6.2 parts of emulsifier, 0.4-0.9 parts of co-emulsifier and 1.8-3.5 parts of pH regulator; The modifier is one of SBS791, SBS791E, SBS792 or SBS792E.

2. The method according to claim 1, characterized in that The matrix asphalt is one of No. 70 road petroleum asphalt or No. 90 road petroleum asphalt; the solubilizer is one of furfural extracted oil, furfural or vegetable oil; the plasticizer is one of dioctyl phthalate or dibutyl phthalate; the stabilizer is one of sulfur, sulfur monochloride or benzoyl peroxide.

3. The method according to claim 2, characterized in that The emulsifier is a slow-cracking, fast-setting cationic asphalt emulsifier; the auxiliary emulsifier is a mixture of anhydrous calcium chloride and sodium carboxymethyl cellulose; and the pH regulator is hydrochloric acid.

4. The method according to claim 3, characterized in that The mass ratio of the anhydrous calcium chloride to sodium carboxymethyl cellulose is 2-3:

1.

5. The method according to claim 1, wherein The preparation method of the high-viscosity emulsified asphalt comprises the following steps: (1) After the base asphalt is heated and softened, it is mixed with the modifier, solubilizer and plasticizer, and the obtained mixture is subjected to a pre-swelling treatment; (2) subjecting the material obtained in step (1) to a first shearing treatment, adding the stabilizer, and then subjecting the material to a second shearing treatment; (3) subjecting the material obtained in step (2) to heat preservation and curing treatment to obtain high-viscosity modified asphalt; (4) adding the co-emulsifier and emulsifier to water, and adjusting the pH to 2-2.5 with a pH regulator to obtain a soap solution; (5) The soap solution is subjected to a third shearing treatment, and then the high-viscosity modified asphalt is added and subjected to a fourth shearing treatment to obtain the high-viscosity emulsified asphalt.

6. The method according to claim 1, wherein The fibers are glass fibers and / or basalt fibers.

7. A method for repairing a road marking pavement, characterized in that: The following steps are involved: (1) Milling old road markings: Mill the old road markings, and control the milling depth to 1~2mm below the road markings to ensure that the old road markings are completely removed; (2) Construction preparation: Ensure that the asphalt surface is clean and free of debris; (3) Surface treatment: Use high-viscosity emulsified asphalt to fill the gaps in the road surface and maintain it; (4) Construction of a slow-cracking structural layer: Apply a mixture of high-viscosity emulsified asphalt and fiber to the asphalt surface layer to obtain a slow-cracking structural layer; (5) Laying new road markings: After the slow-cracking structural layer is solidified, a primer is applied and new road markings are laid; The raw materials of the high-viscosity emulsified asphalt include the following components in parts by mass: 100 parts of base asphalt, 7-10 parts of modifier, 0.6-1.0 parts of solubilizer, 0.7-1.5 parts of plasticizer, 0.2-0.6 parts of stabilizer, 64.8-66.6 parts of water, 3.5-6.2 parts of emulsifier, 0.4-0.9 parts of co-emulsifier and 1.8-3.5 parts of pH regulator; The modifier is one of SBS791, SBS791E, SBS792 or SBS792E.

8. The method according to claim 7, characterized in that The method for constructing a crack mitigation structural layer comprises the following steps: a. Applying the first layer of emulsified asphalt: spraying the high-viscosity emulsified asphalt onto the asphalt surface layer according to the designed thickness to obtain the first layer of emulsified asphalt; b. Laying fiber materials: Laying fiber materials on the wet first layer of emulsified asphalt; c. Applying a second layer of emulsified asphalt: applying a second layer of the high-viscosity emulsified asphalt on the fiber material to construct the slow-cracking structural layer.

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