Modified emulsified asphalt for prevention and maintenance of asphalt pavement as well as preparation method and application of modified emulsified asphalt

Abstract

The invention discloses modified emulsified asphalt for preventive maintenance of an asphalt pavement. The modified emulsified asphalt is prepared from the following components in parts by weight: 60 to 70 parts of modified asphalt, 2.5 to 3.5 parts of hexadecanol polyoxyethylene ether dimethyl octyl ammonium chloride, 0.02 to 0.05 part of lignosulfonate and 0.03 to 0.05 part of polyethyleneimine, the invention also discloses a preparation method and application of the modified emulsified asphalt. According to the invention, the modified asphalt with excellent high-low temperature and adhesive properties is prepared, and the emulsification of the modified asphalt is realized through the synergistic emulsification effect of the compound cationic emulsifier; the modified emulsified asphalt is excellent in high and low temperature performance and has relatively strong adhesive force to an asphalt base surface. Meanwhile, the material is quickly dried at room temperature, and the interlayer bonding strength and low-temperature crack resistance of a wearing layer can be remarkably improved when the material is used as the wearing layer material for preventing and maintaining the asphalt pavement; furthermore, the rapid prevention and maintenance of the asphalt pavement can be realized through a process of'synchronous layer construction + consolidation layer construction ', and the application prospect is good.

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt pavement maintenance materials, and specifically relates to a modified emulsified asphalt for preventive maintenance of asphalt pavement, and a preparation method and application thereof. Background Art

[0002] In recent years, with the increasing traffic volume, load, and the interaction of natural environment and climate factors, many asphalt pavements have developed early pavement diseases such as slight cracks, water seepage, surface damage, and anti-skid attenuation before reaching the designed service life, which seriously affects the use quality and driving comfort of the asphalt pavement, and is even not conducive to driving safety. Against this background, asphalt pavement preventive maintenance technology has emerged in response to the development of the times and industry needs. However, the existing fog seal preventive maintenance technology has limited effect on the repair of diseased asphalt pavements, and can only achieve the repair of slight cracks and color restoration functions. Preventive maintenance technologies such as thin layer overlays and ultra-thin overlays can achieve good repair effects, but the construction energy consumption is high and the cost is high, which makes it difficult to meet the high cost-effectiveness requirements of preventive maintenance. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the main purpose of the present invention is to provide a modified emulsified asphalt for preventive maintenance of asphalt pavement with low cost and excellent high and low temperature performance and adhesion performance, aiming to solve the problem that the existing preventive maintenance materials for asphalt pavement have a single function and cannot meet the current market demand.

[0004] The main purpose of the present invention is to provide a preparation method and application of the modified emulsified asphalt for preventive maintenance of asphalt pavement.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A modified emulsified asphalt for preventive maintenance of asphalt pavement, comprising the following components in parts by weight:

[0007] 60-70 parts of modified asphalt, 2.5-3.5 parts of hexadecanol polyoxyethylene ether dimethyl octyl ammonium chloride, 0.02-0.05 parts of lignin sulfonate, and 0.03-0.05 parts of polyethylene imine.

[0008] In certain specific embodiments, the lignin sulfonate is sodium lignin sulfonate, and the molecular weight of polyethyleneimine is 1500-2000.

[0009] In certain specific embodiments, the modified asphalt is prepared by the following method:

[0010] 1) Heat 70# petroleum asphalt to 135-140℃ for standby use;

[0011] 2) Weigh 70# petroleum asphalt, polymer elastomer, sulfur powder, terpene resin, and vulcanization accelerator in proportion and add them into an iron can, and shear and disperse them at 170-180° C. for 1-2 hours to prepare modified asphalt;

[0012] Furthermore, the modified asphalt comprises the following components in parts by weight: 100-110 parts of 70# petroleum asphalt, 4.5-5.5 parts of polymer elastomer, 0.3-0.5 parts of sulfur powder, 2-4 parts of terpene resin, and 0.1-0.3 parts of vulcanization accelerator.

[0013] The polymer elastomer is SBS1301; the softening point of the terpene resin is 145-160° C.; and the vulcanization accelerator is N-cyclohexyl-2-benzothiazole sulfenamide.

[0014] The present invention also provides a method for preparing modified emulsified asphalt for preventive maintenance of asphalt pavement, comprising the following steps:

[0015] ① Heat the modified asphalt to 160-170℃ for standby use;

[0016] ② Weigh hexadecanol polyoxyethylene ether dimethyl octyl chloride, lignin sulfonate, and polyethyleneimine in proportion, react in 70°C hot water and stir evenly to prepare soap solution;

[0017] ③ Slowly add the formulated amount of soap solution into the hot-melt modified asphalt, and prepare modified emulsified asphalt for preventive maintenance of asphalt pavement through a colloid mill.

[0018] The mass ratio of soap solution to modified asphalt is (35-40):(60-65);

[0019] The purpose of the present invention is to provide the application of modified emulsified asphalt for asphalt pavement preventive maintenance in asphalt pavement preventive maintenance materials.

[0020] In some specific embodiments, the asphalt pavement preventive maintenance material includes an asphalt concrete base surface, a synchronous layer and a consolidation layer from bottom to top, wherein the synchronous layer and the consolidation layer both contain modified emulsified asphalt for preventive maintenance of the asphalt pavement, wherein the amount of modified emulsified asphalt in the synchronous layer is 1-1.5 kg / m 2 The dosage of modified emulsified asphalt in the consolidation layer is 0.3-0.5kg / m 2 .

[0021] In some specific embodiments, the thickness of the synchronization layer is 4-6 mm, and the thickness of the consolidation layer is 0.5-1 mm.

[0022] In certain specific embodiments, the method for applying the modified emulsified asphalt for preventive maintenance of asphalt pavement comprises the following steps:

[0023] 1) After the asphalt road surface is cleaned, the dosage is 1-1.5kg / m 2 The modified emulsified asphalt for the prevention and maintenance of asphalt pavement is sprayed on the upper surface of the asphalt pavement, and basalt crushed stone with a particle size of 3-5mm is spread at the same time. After rolling and curing, the synchronous layer is obtained;

[0024] 2) On the surface of the synchronous layer, the laying amount is 0.3-0.5kg / m 2 The modified emulsified asphalt is used for preventive maintenance of asphalt pavement, and the consolidation layer is obtained after it solidifies.

[0025] Compared with the prior art, the present invention has at least the following advantages:

[0026] 1) The modified asphalt provided by the present invention can improve the softening point of the material, that is, the high-temperature performance, by adding terpene resin; at the same time, under the action of the vulcanization accelerator, the modified asphalt system produces a vulcanization reaction to improve the elasticity of the material, which is manifested in the modified emulsified asphalt as enhanced deformation resistance and improved low-temperature performance. In addition, since the terpene resin itself has extremely strong adhesion, it is used as one of the modifiers. After it is mixed with the polymer elastomer to form a homogeneous structure, it can significantly improve the interlayer bonding strength of the modified emulsified asphalt. The bonding strength value of traditional modified emulsified asphalt and asphalt base is basically 0.4~0.6MPa; the bonding strength of the modified emulsified asphalt of the present invention and asphalt base is 0.8~1.3MPa. That is, the polymer elastomer, terpene resin and vulcanization accelerator in the modified asphalt work synergistically, so that it has excellent comprehensive properties such as softening point, low-temperature performance and interlayer bonding strength.

[0027] 2) This application prepares modified asphalt with excellent high and low temperature and bonding properties, and then achieves emulsification of the modified asphalt through the synergistic emulsification effect of a compound cationic emulsifier to prepare a modified emulsified asphalt for preventive maintenance of asphalt pavements. The preparation process of the modified emulsified asphalt does not require the addition of additional additives or modifier emulsions. The resulting modified emulsified asphalt has excellent high and low temperature properties and has strong adhesion to the asphalt base surface. At the same time, the material dries quickly at room temperature. Using it as a wear layer material for preventive maintenance of asphalt pavements can significantly improve the interlayer bonding strength and low-temperature crack resistance of the wear layer; further, through the process of "synchronous layer construction + consolidation layer construction", rapid preventive maintenance of asphalt pavements can be achieved, and the application prospects are good. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the specific embodiments or the description of the prior art will be briefly introduced below.

[0029] Figure 1 This is a schematic diagram of the cross-sectional structure of the asphalt pavement preventive maintenance material in Example 4 of the present invention; DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0031] When a certain amount, concentration or other value or parameter is expressed in the form of a range, a preferred range, or a preferred upper and lower numerical limit, it should be understood that it is equivalent to specifically revealing any range by combining any pair of upper range limits or preferred numerical values ​​with any lower range limit or preferred numerical value, regardless of whether the range is specifically disclosed. Unless otherwise indicated, the numerical range values ​​listed herein include the endpoints of the range, and all integers and fractions within the range.

[0032] Unless otherwise indicated, all percentages, parts, ratios, etc. herein are by weight.

[0033] The materials, methods, and examples herein are illustrative and are not to be construed as limiting unless specifically stated.

[0034] In the following examples, the CAS number of hexadecanol polyoxyethylene ether dimethyl octyl ammonium chloride is 71-00-1; the CAS number of sulfur powder is 7704-34-9; the CAS number of sodium lignin sulfonate is 8061-51-6; the CAS number of polyethylene imine is 9002-98-6; the CAS number of terpene resin is 9003-74-1; the CAS number of N-cyclohexyl-2-benzothiazole sulfenamide is 95-33-0. SBS elastomer is purchased from Ningbo Changhong High-Tech SBS, which is a commercial product with the brand name CH1301-1HE, and its tensile strength is ≥18.0MPa and the elongation at break is ≥700%.

[0035] Example 1

[0036] This embodiment provides a method for preparing modified emulsified asphalt for preventive maintenance of asphalt pavement, comprising the following steps:

[0037] 1) Preparation of modified asphalt

[0038] 11) Heat 70# petroleum asphalt as base asphalt to 135°C for standby use;

[0039] 12) Weigh 100 parts by weight of 70# petroleum asphalt, 4.5 parts by weight of polymer elastomer (SBS1301), 0.3 parts by weight of sulfur powder, 3 parts by weight of terpene resin (softening point is 145-150°C), and 0.2 parts by weight of vulcanization accelerator N-cyclohexyl-2-benzothiazolesulfenamide and add them into an iron can, shear and disperse them at 175°C for 1.5 hours to prepare asphalt pavement modified asphalt.

[0040] 2) Preparation of modified emulsified asphalt

[0041] 21) heating 60 parts by weight of asphalt pavement modified asphalt to 165° C. for later use;

[0042] 22) Weigh 2.5 parts by weight of hexadecanol polyoxyethylene ether dimethyl octyl ammonium chloride, 0.02 parts by weight of sodium lignin sulfonate, 0.04 parts by weight of polyethyleneimine (molecular weight 1800), and 70° C. hot water and stir well to prepare a soap solution;

[0043] 23) The soap solution in step 22) is slowly added to the hot-melted modified asphalt in step 21) (the mass ratio of the soap solution to the modified asphalt is 40:60), and the modified emulsified asphalt for preventive maintenance of asphalt pavement is prepared by colloid milling.

[0044] Example 2

[0045] This embodiment provides a method for preparing modified emulsified asphalt for preventive maintenance of asphalt pavement, comprising the following steps:

[0046] 1) Preparation of modified asphalt

[0047] 11) Heat 70# petroleum asphalt as base asphalt to 135°C for standby use;

[0048] 12) Weigh 105 parts by weight of 70# petroleum asphalt, 5.0 parts by weight of polymer elastomer (SBS1301), 0.4 parts by weight of sulfur powder, 3 parts by weight of terpene resin (softening point is 145-150°C), and 0.2 parts by weight of vulcanization accelerator N-cyclohexyl-2-benzothiazolesulfenamide and add them into an iron can, shear and disperse them at 175°C for 1.5 hours to prepare asphalt pavement modified asphalt.

[0049] 2) Preparation of modified emulsified asphalt

[0050] 21) heating 65 parts by weight of asphalt pavement modified asphalt to 165° C. for later use;

[0051] 22) Weigh 3 parts by weight of hexadecanol polyoxyethylene ether dimethyl octyl ammonium chloride, 0.035 parts by weight of sodium lignin sulfonate, 0.03 parts by weight of polyethyleneimine (molecular weight 1800), and 70° C. hot water and stir well to prepare a soap solution;

[0052] 23) The soap solution in step 22) is slowly added to the hot-melt modified asphalt (35:65) in step 21), and the modified emulsified asphalt for preventive maintenance of asphalt pavement is prepared by colloid milling.

[0053] Example 3

[0054] This embodiment provides a method for preparing modified emulsified asphalt for preventive maintenance of asphalt pavement, comprising the following steps:

[0055] 1) Preparation of modified asphalt

[0056] 11) Heat 70# petroleum asphalt as base asphalt to 135°C for standby use;

[0057] 12) Weigh 110 parts by weight of 70# petroleum asphalt, 5.5 parts by weight of polymer elastomer (SBS1301), 0.5 parts by weight of sulfur powder, 2 parts by weight of terpene resin (softening point is 145-150°C), and 0.2 parts by weight of vulcanization accelerator N-cyclohexyl-2-benzothiazolesulfenamide and add them into an iron can, shear and disperse them at 175°C for 1.5 hours to prepare asphalt pavement modified asphalt.

[0058] 2) Preparation of modified emulsified asphalt

[0059] 21) heating 63 parts by weight of asphalt pavement modified asphalt to 165° C. for later use;

[0060] 22) Weigh 3.5 parts by weight of hexadecanol polyoxyethylene ether dimethyl octyl ammonium chloride, 0.04 parts by weight of sodium lignin sulfonate, 0.05 parts by weight of polyethyleneimine (molecular weight 1800), and 70° C. hot water and stir well to prepare a soap solution;

[0061] 23) The soap solution in step 22) is slowly added to the hot-melted modified asphalt in step 21) (the mass ratio of the soap solution to the modified asphalt is 37:63), and the modified emulsified asphalt for preventive maintenance of asphalt pavement is prepared by colloid milling.

[0062] Example 4

[0063] Taking the modified emulsified asphalt prepared in Example 2 as an example, the modified emulsified asphalt is mainly used in asphalt pavement preventive maintenance materials, and the specific application method is as follows:

[0064] like Figure 1 As shown, 1) After the asphalt pavement 1 is cleaned, the amount is 1.2kg / m 2 The modified emulsified asphalt for the preventive maintenance of the asphalt pavement is sprayed on the upper surface of the asphalt pavement, and basalt crushed stone with a particle size of 3-5mm is spread synchronously, and the synchronous layer 2 is obtained after rolling and curing;

[0065] 2) On the surface of synchronous layer 2, the laying amount is 0.5kg / m 2 The modified emulsified asphalt for preventive maintenance of asphalt pavement is used to obtain a consolidated layer 3 after solidification.

[0066] The asphalt pavement preventive maintenance material includes a consolidation layer 3 (thickness 0.8mm), a synchronous layer 2 (thickness 5mm) and an asphalt concrete base surface 1 from top to bottom, wherein the synchronous layer 2 is formed by synchronously spreading modified emulsified asphalt for asphalt pavement preventive maintenance and basalt crushed stone, and then rolling, curing and solidifying, and the consolidation layer 3 is formed by spreading modified emulsified asphalt for asphalt pavement preventive maintenance, wherein the amount of modified emulsified asphalt in the synchronous layer is 1.2kg / m 2 The dosage of modified emulsified asphalt in the consolidation layer is 0.5kg / m 2 .

[0067] Comparative Example 1

[0068] This comparative example provides a method for preparing modified emulsified asphalt for preventive maintenance of asphalt pavement. Its components are basically the same as those in Example 2, except that the modified asphalt does not contain terpene resin; its process steps and parameters are the same as those in Example 2.

[0069] Comparative Example 2

[0070] This comparative example provides a method for preparing modified emulsified asphalt for preventive maintenance of asphalt pavement. Its components are basically the same as those in Example 2, except that the modified asphalt does not include a vulcanization accelerator; its process steps and parameters are the same as those in Example 2.

[0071] Comparative Example 3

[0072] This comparative example provides a method for preparing modified emulsified asphalt for preventive maintenance of asphalt pavement. Its components are basically the same as those in Example 2, except that the modified asphalt does not contain terpene resin and vulcanization accelerator; its process steps and parameters are the same as those in Example 2.

[0073] This application takes Example 2 as an example, and performs performance tests on the prepared modified emulsified asphalt for asphalt pavement prevention and maintenance; and the asphalt pavement prevention and maintenance material prepared in Example 4, and the results are shown in Table 1 and Table 2;

[0074] Table 1 Performance test of modified emulsified asphalt for preventive maintenance of asphalt pavement

[0075]

[0076] Table 2 Performance test of asphalt pavement preventive maintenance materials

[0077] Test items Technical requirements Detection value Test methods Friction coefficient swing value ≥60 75 JTG 3450T0964 Water permeability, mL / min ≤10 0 JTG 3450T0971 25℃ Drying time, h ≤1.5 1.0 GB / T 16777

[0078] From the data in Table 1 and Table 2, it can be seen that the softening point of the modified emulsified asphalt for preventive maintenance of asphalt pavement in this application is above 90°C, with excellent high temperature performance; the elongation at 5°C is above 40cm, with excellent low temperature performance; and the interlayer bonding strength with the asphalt base surface at 25°C can reach above 1MPa; at the same time, the actual drying time of the material at 25°C is short, which is 1 hour, meeting the requirements for rapid opening of traffic, and causing little traffic interference during construction;

[0079] In addition, the friction coefficient swing value of the asphalt pavement preventive maintenance material prepared by the modified emulsified asphalt through the process of "synchronous layer construction + consolidation layer construction" is 75, water-proof, and the actual drying time at 25°C is 1 hour. The material of the present invention is used for repairing minor diseases of asphalt pavement, which can effectively solve the problems of minor cracks, water seepage, insufficient anti-skid and the like.

[0080] At the same time, the present application also takes Example 2 as an example to perform performance tests on the modified emulsified asphalt prepared in Example 2 and Comparative Examples 1-3. The results are shown in Table 3:

[0081] Table 3 Performance test of modified emulsified asphalt of Example 2 and each comparative example

[0082]

[0083] As can be seen from Table 3, the modified emulsified asphalt in this application has excellent high and low temperature resistance and mechanical properties, and has excellent bonding properties; by comparing Example 2 with Comparative Example 1, it can be seen that the addition of terpene resin enhances the bonding strength between the material and the asphalt base surface, and at the same time increases the softening point of the material to 96°C, that is, the high temperature performance is improved; by comparing Example 2 with Comparative Example 2, it can be seen that the vulcanization effect of the vulcanization accelerator improves the high temperature performance of the material and also has a certain promoting effect on the bonding strength; by comparing Example 2 with Comparative Example 3, it can be seen that only in the presence of polymer elastomer, the high and low temperature performance of the material is reduced compared with Example 2, and the interlayer bonding strength is 0.51, and the 5°C elongation is also greatly reduced. In summary, it can be seen that the high temperature performance, low temperature performance, bonding strength and mechanical strength of the modified emulsifier asphalt are improved by the synergistic effect of polymer elastomer, terpene resin and vulcanization accelerator in this application.

[0084] Comparative Example 4

[0085] The asphalt pavement preventive maintenance material in this comparative example uses the same modified emulsified asphalt as in Example 2, and its application method is basically the same as in Example 4, except that only a synchronous layer is provided, and no consolidation layer is provided. Specifically, after the asphalt pavement is cleaned, the amount of 1.2 kg / m 2 The modified emulsified asphalt for preventive maintenance of asphalt pavement is sprayed on the asphalt concrete base surface, and basalt crushed stone is spread simultaneously. After rolling and curing, the synchronous layer is obtained.

[0086] Comparative Example 5

[0087] The asphalt pavement preventive maintenance material in this comparative example uses the same modified emulsified asphalt as in Example 2, and its application method is basically the same as in Example 4, except that only a consolidation layer is provided, and no synchronization layer is provided. Specifically, after the asphalt pavement is cleaned, the paving amount is 0.5 kg / m 2 The modified emulsified asphalt for preventive maintenance of asphalt pavement is applied to the asphalt concrete base surface, and the consolidated layer is obtained after it solidifies.

[0088] The present application conducts actual application tests on the asphalt pavements in Example 4 and Comparative Examples 4 and 5, and the results are shown in Table 3:

[0089] Table 3 Performance test results of various asphalt pavement preventive maintenance materials

[0090] Asphalt pavement preventive maintenance materials Condition Synchronous layer + consolidation layer Friction coefficient swing value 75; water permeability coefficient 0; no particle loss Synchronization layer The friction coefficient swing value is 77; the crushed stone embedding effect is poor, and large areas of grains fall off Consolidation layer Friction coefficient swing value 35; water permeability coefficient 0; poor skid resistance

[0091] As can be seen from Table 3, the preventive maintenance material for asphalt pavement in this application adopts modified emulsified asphalt and sets a preventive maintenance material with a specific structure, so that the preventive maintenance material and the original asphalt base surface form a tough overall structure with excellent anti-skid performance, effectively improving the anti-skid, anti-water permeability and water resistance of the existing asphalt pavement. When there is only a synchronous layer, the friction coefficient swings to 77, the crushed stone embedding effect is poor, and a large area of ​​grains fall off; when there is only a consolidation layer, the friction coefficient swings to 35, the water permeability coefficient is 0, and the anti-skid performance is poor, which is equivalent to laying a smooth waterproof layer on the original asphalt pavement; it shows that when the preventive maintenance material is set as a synchronous layer and a consolidation layer, it has good anti-skid, water-tight, and anti-graining effects.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. 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, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A modified emulsified asphalt for preventive maintenance of asphalt pavement, It is characterized in that The composition includes the following components by weight: 60-70 parts of modified asphalt, 2.5-3.5 parts of hexadecanol polyoxyethylene ether dimethyl octyl ammonium chloride, 0.02-0.05 parts of lignin sulfonate, and 0.03-0.05 parts of polyethylene imine.

2. The modified emulsified asphalt for preventive maintenance of asphalt pavement according to claim 1, It is characterized in that The lignin sulfonate is sodium lignin sulfonate, and the molecular weight of polyethyleneimine is 1500-2000.

3. The modified emulsified asphalt for preventive maintenance of asphalt pavement according to claim 1, It is characterized in that The modified asphalt is prepared by the following method: 1) Heat 70# petroleum asphalt to 135-140℃ for standby use; 2) Weigh 70# petroleum asphalt, polymer elastomer, sulfur powder, terpene resin, and vulcanization accelerator in proportion and add them into an iron can, and shear and disperse them at 170-180° C. for 1-2 hours to prepare modified asphalt.

4. The modified emulsified asphalt for preventive maintenance of asphalt pavement according to claim 3, It is characterized in that The composition includes the following components by weight: 100-110 parts of 70# petroleum asphalt, 4.5-5.5 parts of polymer elastomer, 0.3-0.5 parts of sulfur powder, 2-4 parts of terpene resin and 0.1-0.3 parts of vulcanization accelerator.

5. The modified emulsified asphalt for preventive maintenance of asphalt pavement according to claim 1, It is characterized in that The polymer elastomer is SBS1301; the softening point of the terpene resin is 145-160° C.; and the vulcanization accelerator is N-cyclohexyl-2-benzothiazolesulfenamide.

6. A method for preparing the modified emulsified asphalt for preventive maintenance of asphalt pavement according to claim 1, It is characterized in that The steps include: ① Heat the modified asphalt to 160-170℃ for standby use; ② Weigh hexadecanol polyoxyethylene ether dimethyl octyl chloride, lignin sulfonate, and polyethyleneimine in proportion, react in a hot water bath at 70°C and stir evenly to prepare a soap solution; ③ Slowly add the formulated amount of soap solution into the hot-melt modified asphalt, and prepare modified emulsified asphalt for preventive maintenance of asphalt pavement through a colloid mill.

7. Use of the modified emulsified asphalt for preventive maintenance of asphalt pavements according to claims 1 to 5 or the modified emulsified asphalt for preventive maintenance of asphalt pavements obtained by the preparation method according to claim 6 in asphalt pavement preventive maintenance materials.

8. The use according to claim 7, It is characterized in that It comprises, from top to bottom, a consolidation layer, a synchronization layer and an asphalt concrete base surface, a synchronization layer and a consolidation layer, wherein the synchronization layer and the consolidation layer both contain the modified emulsified asphalt for preventive maintenance of asphalt pavement according to any one of claims 1 to 6, wherein the amount of the modified emulsified asphalt for preventive maintenance of asphalt pavement in the synchronization layer is 1-1.5 kg / m 2 The dosage of modified emulsified asphalt for preventive maintenance of asphalt pavement in the consolidation layer is 0.3-0.5kg / m 2 .

9. The use according to claim 8, It is characterized in that The thickness of the synchronization layer is 4-6 mm, and the thickness of the consolidation layer is 0.5-1 mm.

10. The use according to claim 9, It is characterized in that The application method of the modified emulsified asphalt for preventive maintenance of asphalt pavement comprises the following steps: 1) After the asphalt road surface is cleaned, the dosage is 1-1.5kg / m 2 The modified emulsified asphalt for the prevention and maintenance of asphalt pavement is sprayed on the upper surface of the asphalt pavement, and basalt crushed stone with a particle size of 3-5mm is spread at the same time. After rolling and curing, the synchronous layer is obtained; 2) On the surface of the synchronous layer, the laying amount is 0.3-0.5kg / m 2 The modified emulsified asphalt is used for preventive maintenance of asphalt pavement, and the consolidation layer is obtained after it solidifies.

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