Large-temperature-difference cold region road marking crack retarding material, structure and application method

Abstract

The invention discloses a large-temperature-difference cold region road marking crack retarding material, a structure and an application method, and relates to the technical field of pavement materials. According to the invention, high-viscosity emulsified asphalt is used as a crack retarding material component, and the high-viscosity emulsified asphalt is prepared from the following raw materials in parts by mass: 100 parts of matrix asphalt, 7-10 parts of a modifier, 0.6-1.0 part of a solubilizer, 0.7-1.5 parts of a plasticizer, 0.2-0.6 part of a stabilizer, 64.8-66.6 parts of water, 3.5-6.2 parts of an emulsifier, 0.4-0.9 part of a co-emulsifier and 1.8-3.5 parts of a pH regulator. The prepared crack-retarding material has the advantages of being high in cohesiveness and outstanding in low-temperature cracking resistance, can be used for repairing asphalt pavement cracks and serving as a road marking crack-retarding material, and has wide application prospects in maintenance and repairing of road marking in large-temperature-difference cold regions by mixing the high-viscosity emulsified asphalt with fibers to form a novel crack-retarding structural layer.

Description

Technical Field

[0001] The 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 an important part of asphalt pavement infrastructure, road markings are affected by environmental factors such as temperature, humidity, oxygen and ultraviolet radiation during service, and will suffer from aging, cracking and peeling. In cold northern regions, the temperature difference is large in winter, and the cracking of road markings is more severe. It is often accompanied by cracks from top to bottom between road markings and asphalt materials due to load and temperature stress, and the depth can reach 1 to 2 cm. These fine cracks from top to bottom caused by the cracking of the markings can allow moisture to penetrate into the asphalt pavement, causing volume expansion at low temperatures, increasing the risk of damage to the pavement structure, and ultimately affecting the durability and safety of the asphalt pavement. At the same time, during the service of asphalt pavements, due to base deformation, construction quality and other reasons, reflective cracks from bottom to top will occur, which will not only allow new marking materials to penetrate into the cracks during application, affecting the construction quality, but also cause local concentrated stress on the markings due to cracks in the lower layer, accelerating the cracking of the markings.

[0003] In view of this, there is an urgent need for a crack-slowing material and structural layer for road markings in cold areas with large temperature differences. Such crack-slowing materials should have the characteristics of strong flexibility and good low-temperature performance, so as to treat cracks in asphalt pavements, improve the use of the original pavement, and provide good service conditions for road markings. At the same time, a crack-slowing structural layer can be set based on the crack-slowing material. The structural layer should have good low-temperature crack resistance and be adaptable to cold climate conditions with large temperature differences, so as to slow down the development of reflective cracks in the asphalt pavement upward to the surface of the markings, and also prevent the cracking of the road markings from causing crack damage to the lower structure, so as to improve the durability and safety between the asphalt pavement and the road markings. Summary of the invention

[0004] The purpose of the present invention is to provide a road marking crack-mitigating 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 condition and reducing the mutual adverse effects between road markings and asphalt pavements during service, so as to improve the coating quality and service life of 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, wherein the raw materials include the following components in parts by weight: 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 adjuster.

[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 adjuster 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 to 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) heating and softening the base asphalt, mixing it with the modifier, solubilizer and plasticizer, and subjecting the obtained mixture 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 a heat preservation and curing treatment to obtain a high-viscosity modified asphalt;

[0014] (4) adding the co-emulsifier and the emulsifier into water, and adjusting the pH to 2 to 2.5 with a pH adjuster 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 carried out at a temperature of 170 to 200° C. and for a time of 10 to 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 curing treatment is 170-190° C., and the time is 2-4 hours.

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

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

[0021] Furthermore, in step (5), before performing the third shearing treatment, the step of preheating the soap solution is also included, and the preheating temperature is 60 to 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 base asphalt is 120-150°C.

[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 preparing road marking road surface crack-mitigating structural layers. It is suitable for cold areas with large temperature differences of -15 to 30°C.

[0026] The fourth technical solution of the present invention is to provide a method for improving the performance of road marking pavement by using a slow-cracking structural layer, wherein a mixture of fiber and the high-viscosity emulsified asphalt is used as the slow-cracking structural layer;

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

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

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

[0030] (1) Milling old road markings: Mill the old road markings, and control the milling depth to 1-2 mm 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 modified emulsified asphalt mentioned above to fill the gaps in the road surface, maintain 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 modified emulsified asphalt and the fiber to an asphalt surface layer to obtain a slow-cracking structural layer;

[0034] (5) Maintenance treatment: 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.

[0035] (6) After the slow-crack structural layer is cured 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-crack 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: spraying the modified emulsified asphalt onto the asphalt surface layer according to the designed thickness to obtain the first layer of emulsified asphalt;

[0039] b. Laying of fiber materials: Lay fiber materials evenly on the first wet layer of emulsified asphalt;

[0040] c. Second layer of emulsified asphalt coating: Apply a second layer of 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-mitigating 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 invention provides a road marking crack-retarding material for cold areas with large temperature differences, which has good fluidity at room temperature, strong applicability to low temperature and humid environments, fast construction speed and good construction quality, and avoids energy consumption and environmental pollution of conventional modified asphalt during the construction process.

[0044] The present invention further adds fiber material to the crack-mitigating material and uses it as a crack-mitigating structural layer for road markings. The porous structure and texture characteristics of the fiber can form a stable structure with emulsified asphalt, and can absorb and disperse the stress of the crack-mitigating 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-mitigating structural layer and improves its deformation resistance and tensile strength in cold areas with large temperature differences.

[0045] The present invention uses a crack-reducing structural layer formed by combining crack-reducing materials with fibers. 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 markings, thereby improving the durability and safety of both asphalt pavements and road markings. It 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 drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0047] Figure 1 It 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 should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0049] In the following embodiments and comparative examples of the present invention, the emulsifier used is the slow-cracking and fast-setting cationic asphalt emulsifier provided by Shengquan Company, the auxiliary 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 auxiliary emulsifier, 3.5 parts of emulsifier and 1.8 parts of hydrochloric acid, wherein the auxiliary 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# base asphalt to 135°C, add SBS791, furfural extracted oil and dioctyl phthalate, and place the mixed binder in an oil bath at 180°C to heat and swell for 10 minutes;

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

[0056] Step 3: After the shearing is completed, 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: The colloid mill was preheated to 60°C, soap solution was added, and shearing was performed at a shear rate of 2000 r / min for 30 s;

[0059] Step 6: Pour the high-viscosity modified asphalt at 175°C 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 auxiliary emulsifier, 4.4 parts of emulsifier and 2.1 parts of hydrochloric acid; wherein the auxiliary 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# base asphalt to 135°C, add SBS791E, furfural and dibutyl phthalate, and place the mixed binder in an oil bath at 180°C to heat and swell for 10 minutes;

[0065] Step 2: The mixed binder is sheared 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, and then the shear rate is reduced to 3000 r / min for 60 min;

[0066] Step 3: After the shearing is completed, the asphalt is 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: The colloid mill was preheated to 65°C, soap solution was added, and shearing was performed 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 grind for 3 minutes 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# base asphalt to 135°C, add SBS792, vegetable oil and dibutyl phthalate, and place the mixed binder in an oil bath at 180°C to heat and swell for 15 minutes;

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

[0076] Step 3: After the shearing is completed, 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: The colloid mill was preheated to 75°C, soap solution was added, and shearing was performed 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 5000r / min and the grinding time to 4min 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# base 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 auxiliary emulsifier, 6.2 parts of emulsifier and 3.5 parts of hydrochloric acid; wherein the auxiliary 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# base asphalt to 135°C, add SBS792E, furfural extracted oil and dibutyl phthalate in sequence, and place the mixed binder in an oil bath at 190°C for heating and swelling for 20 minutes;

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

[0086] Step 3: After the shearing is completed, 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 the 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: The colloid mill was preheated to 80°C, soap solution was added, and shearing was performed 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 grind for 5 minutes to obtain high-viscosity emulsified asphalt.

[0090] Example 5

[0091] The present invention provides a conventional modified emulsified asphalt. As a comparison with Examples 1 to 4, the mass proportions of the raw materials 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# base 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 is sheared at a shear rate of 7000 r / min for 20 min using a high-speed shear instrument, during which sulfur is added in small amounts and multiple times, and then the shear rate is reduced to 2000 r / min for 90 min;

[0096] Step 3: After the shearing is completed, the asphalt is 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: The colloid mill was preheated to 60°C, soap solution was added, and shearing was performed 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 asphalt after demulsification in Examples 1 to 5 were tested, and the technical properties are shown in Table 1.

[0101] Table 1 Technical performance

[0102] Group Example 1 Example 2 Example 3 Example 4 Example 5 60℃ dynamic viscosity (Pa·s) 24514 55431 277729 459123 13075 Solid content (%) 60.4 60.9 61.5 62.3 60.7 1d storage stability (%) 0.23 0.45 0.57 0.68 0.51 5d storage stability (%) 2.16 3.05 3.62 4.13 4.25 25℃ Needle penetration (dmm) 55.1 47.5 44.3 42.7 58.9 Softening point(℃) 88.1 90.3 92.5 93.3 79.8 5℃ elongation (cm) 31.7 35.6 45.8 52.3 23.5

[0103] The modifier forms a three-dimensional network structure by dispersing inside the asphalt, which limits the movement of the continuous phase asphalt molecules and disperses the shrinkage stress of the asphalt molecules at low temperatures, so that the crack-mitigating material has good low-temperature performance. From the test results in Table 1, it can be seen that the high-viscosity emulsified asphalt prepared by the present invention has excellent adhesion and stability, and its 60°C dynamic viscosity is greater than 20,000 Pa·s. At the same time, the low-temperature elongation is much higher than the 20cm required by the specification, with good ductility, outstanding tensile strength in cold environments, and excellent comprehensive performance.

[0104] Small beam bending test and 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 implementation method of the beam bending test is as follows: by mass, 100 parts of aggregate, 9 parts of modified emulsified asphalt prepared in Examples 1 to 5, 3 parts of cement, 6 parts of water, and 3 parts of mineral powder are mixed and rolled to form a rutting plate specimen with a length of 300 mm, a width of 300 mm, and a thickness of 50 mm. Among them, AC-13 is selected as the grading, and PO42.5 ordinary Portland cement is used as the cement type. After curing at room temperature for 28 days, the rutting plate specimen is cut into a beam specimen with a length of 250 mm, a width of 30 mm, and a height of 35 mm. The bending strain and bending stiffness modulus of the beam specimen are tested using a universal testing machine UTM, which are marked as effect examples 1-5.

[0107] 8% of the mass of the fibers were added to the emulsified asphalt of Examples 1-5, respectively, as Comparative Examples 1-5 (glass fibers were added to Comparative Examples 1, 3 and 5, and basalt fibers were added to Comparative Examples 2 and 4). Comparative Examples 1-5 were subjected to the same beam bending test as Examples 1-5, and were marked as Effect Examples 6-10, respectively.

[0108] Effect verification example 2:

[0109] The specific implementation method of the direct pull test is: cut a piece of limestone with a length of 50 mm, a width of 50 mm, and a thickness of 10 mm, and apply 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 to make a pulling specimen of 50 mm in length × 50 mm in width × 20 mm in thickness. After curing for 72 hours, the pulling strength and pulling elongation of the pulling specimen were tested by a universal testing machine UTM, which were marked as effect embodiments 11-15.

[0110] When the modified emulsified asphalt of Example 1-5 is applied on the limestone, the fibers are evenly spread, and the amount of fibers used is 100 g / m 2, emulsified asphalt and fiber should be added in layers for multiple times to ensure that the fiber is completely dispersed in the emulsified asphalt, as comparative examples 6-10 (glass fiber is added in comparative examples 6, 8 and 10, and basalt fiber is added in comparative examples 7 and 9). Comparative examples 6-10 were subjected to direct pulling tests under the same conditions, and are marked as effect examples 16-20.

[0111] The flexural strain, flexural stiffness 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] Group Bending strain (με) Bending stiffness modulus (MPa) Effect Example 1 2103.7 2757.0 Effect Example 2 2397.4 2581.4 Effect Example 3 2643.5 2473.7 Effect Example 4 3138.2 2356.5 Effect Example 5 1761.3 3065.9 Effect Example 6 2237.9 2634.1 Effect Example 7 2531.6 2392.2 Effect Example 8 2824.1 2307.8 Effect Example 9 3423.5 2189.3 Effect Example 10 1907.8 2919.6

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

[0115] Group Pull-out strength(N) Pull-out elongation (mm) Effect Example 11 891 7 Effect Example 12 1134 11 Effect Example 13 1632 15 Effect Example 14 2357 21 Effect Example 15 623 2 Effect Example 16 1025 9 Effect Example 17 1382 14 Effect Example 18 1878 19 Effect Example 19 2639 26 Effect Example 20 735 4

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

[0117] Group Bending strain (με) Bending stiffness modulus (MPa) Effect Example 1 3586.7 803.7 Effect Example 2 3859.2 768.8 Effect Example 3 4393.9 723.3 Effect Example 4 4737.4 702.6 Effect Example 5 2803.8 818.4 Effect Example 6 3898.5 774.8 Effect Example 7 4227.3 747.1 Effect Example 8 4789.6 709.2 Effect Example 9 5181.2 657.5 Effect Example 10 3189.4 785.9

[0118] Table 5 Pull-out strength and pull-out elongation at 30°C

[0119]

[0120]

[0121] It can be seen that the de-crack structure 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 pull-out elongation of the de-crack structure layer, effectively reduce the occurrence of pavement cracks, and improve the deformation resistance and stress relaxation ability of the de-crack structure layer in cold areas with large temperature differences.

[0122] The present invention prepares emulsified asphalt from high-viscosity modified asphalt, has qualified storage stability, has the advantages of strong adhesion, good flexibility and wide application range, and can be used as a repair material for old pavements in cold areas. The fiber is combined with the high-viscosity emulsified asphalt to form a slow-cracking structural layer with strong deformation resistance and high tensile strength, which is adaptable to cold areas with a large temperature difference of -15 to 30°C, and improves the durability and safety between the asphalt pavement and the road marking.

[0123] The above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above descriptions. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the protection scope of the invention.

Claims

1. A high-viscosity emulsified asphalt, characterized in that: The raw materials 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 adjuster.

2. The high-viscosity emulsified asphalt according to claim 1, characterized in that: The base asphalt is 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 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 high-viscosity emulsified asphalt according to claim 2, characterized in that: The emulsifier is a slow-cracking and 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 high-viscosity emulsified asphalt 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 for preparing high-viscosity emulsified asphalt according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) heating and softening the base asphalt, mixing it with the modifier, solubilizer and plasticizer, and subjecting the obtained mixture 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 a heat preservation and curing treatment to obtain a high-viscosity modified asphalt; (4) adding the co-emulsifier and the emulsifier into water, and adjusting the pH to 2 to 2.5 with a pH adjuster 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. Use of the high-viscosity emulsified asphalt as described in any one of claims 1 to 4 in repairing cracks in asphalt pavement and preparing a road marking pavement crack-mitigating structural layer.

7. A method for improving the performance of road marking pavement using a slow-cracking structural layer, characterized in that: A mixture of fiber and the high-viscosity emulsified asphalt described in any one of claims 1 to 4 is used as a slow-cracking structural layer; the mass ratio of the high-viscosity emulsified asphalt to the fiber is 10 to 20:1, and the slow-cracking structural layer is arranged between the asphalt pavement surface and the road marking.

8. The method according to claim 7, characterized in that The fibers are glass fibers and / or basalt fibers.

9. A method for repairing a road marking road surface, characterized in that: The following steps are involved: (1) Milling old road markings: Mill the old road markings, and control the milling depth to be 1 to 2 mm 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: using the high-viscosity emulsified asphalt described in claim 1 to fill the gaps in the road surface and maintain it; (4) constructing a slow-cracking structural layer: applying the mixture of the high-viscosity emulsified asphalt and the fiber described in claim 1 to the asphalt surface layer to obtain a slow-cracking structural layer; (5) Laying new road markings: After the slow-cracking structural layer is cured, a primer is applied and new road markings are laid.

10. The method according to claim 9, 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 modified emulsified asphalt onto the asphalt surface layer according to the designed thickness to obtain the first layer of emulsified asphalt; b. Laying of 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 emulsified asphalt on the fiber material again to construct the slow-cracking structural layer.

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