An easily wettable, large-void asphalt mixture and its preparation method

Abstract

This application relates to the field of pavement materials, specifically disclosing an easily wettable, high-porosity asphalt mixture and its preparation method. The easily wettable, high-porosity asphalt mixture comprises the following components by weight: 90-94.5 parts aggregate, 2-4 parts mineral powder, 1-3 parts cement, 2.5-5.5 parts emulsified asphalt, and 2.5-3.5 parts water. The emulsified asphalt comprises the following components by weight: 50-60 parts asphalt, 40-50 parts water, 0.1-0.5 parts thickener, 2.0-3.5 parts emulsifier, 1-3 parts silane coupling agent, and 2-6 parts interface modifier. The interface modifier includes at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, and hydroxypropyl methacrylate. The mixture of this application can improve the wettability of cement-based grout in asphalt mixtures and reduce interfacial micro-defects.

Description

Technical Field

[0001] This application relates to the field of road materials, and more specifically, to an easily wettable, large-void asphalt mixture and its preparation method. Background Technology

[0002] Semi-flexible pavements consist of large-void asphalt mixtures and cement-based grout filling the voids, combining the advantages of good flexibility of asphalt pavements and high load-bearing capacity of cement pavements. They have been widely used in rutting treatment projects at intersections, BRT lanes, bus stops, and other road sections. Current research focuses on the development of high-performance grouts and the design of the matrix asphalt skeleton, lacking consideration for the characterization and design of the two-phase interface properties. Because water does not wet the asphalt surface, while the preparation of cement grout requires water as a carrier, numerous voids and micro-defects exist at the cement-asphalt composite interface, significantly affecting the composite's performance. Summary of the Invention

[0003] To improve the wettability of cement-based grout in asphalt mixtures and reduce interfacial micro-defects, this application provides an easily wettable, large-void asphalt mixture and its preparation method.

[0004] Firstly, this application provides an easily wettable, large-void asphalt mixture, employing the following technical solution:

[0005] An easily impregnable large-pore asphalt mixture, the raw materials by weight include the following components: 90-94.5 parts aggregate, 2-4 parts mineral powder, 1-3 parts cement, 2.5-5.5 parts emulsified asphalt, and 2.5-3.5 parts water;

[0006] The raw materials of the emulsified asphalt include the following components by weight: 50-60 parts asphalt, 40-50 parts water, 0.1-0.5 parts thickener, 2.0-3.5 parts emulsifier, 1-3 parts silane coupling agent, and 2-6 parts interface modifier; the interface modifier includes at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, and hydroxypropyl methacrylate.

[0007] By adopting the above technical solution, in the asphalt mixture of this application, the asphalt uniformly coats the aggregate to form an asphalt film; moreover, after grouting, the asphalt almost completely bonds with the cement grout, thus forming a very uniform asphalt film between the cement grout and the aggregate, effectively reducing interfacial micro-defects. This is because in this application, the silane coupling agent and the interface modifier can work together. The silane coupling agent mainly acts between the asphalt and the aggregate in the mixture, effectively strengthening the interfacial strength between the asphalt and the aggregate; simultaneously, after grouting, the interface modifier mainly acts between the asphalt and the cement grout, effectively improving the wettability of the cement grout on the asphalt surface, and also effectively strengthening the interfacial strength between the cement grout and the asphalt. In addition, some of the silane coupling agent can also work with the interface modifier to further strengthen the interfacial strength between the cement grout and the asphalt. The combination of the two not only ensures that the asphalt is fully bonded between the aggregate and the cement grout, but also strengthens both interfaces simultaneously, resulting in a very uniform asphalt film without any uneven distribution. This effectively improves the problem of numerous voids and micro-defects at the interface of composite materials, which greatly affect the performance of the composite materials.

[0008] Furthermore, the silane coupling agent includes at least one of KH550, KH570, and DB570.

[0009] Further, the cement is PO42.5 silicate cement. The aggregate includes at least one of basalt, limestone, and diabase. The thickener includes cellulose ether and its derivatives, and the viscosity of the thickener is 50,000-100,000 cps. The emulsifier includes anionic emulsifiers. The density of the aggregate is 2.80-2.88 g / cm³. 3 The density of the mineral powder is 2.24-2.28 g / cm³. 3 .

[0010] Furthermore, the method for preparing the emulsified asphalt includes the following steps:

[0011] S1. Heat the water to 60-70℃;

[0012] S2. Mix the emulsifier, thickener and water to form a soap solution;

[0013] S3. Heat the asphalt to 130-140℃, mix it with soap solution and grind it to form an emulsion;

[0014] S4. After the emulsion cools, add the silane coupling agent and interface regulator, and stir evenly to form emulsified asphalt.

[0015] Secondly, this application provides a method for preparing an easily wettable, large-void asphalt mixture, employing the following technical solution:

[0016] A method for preparing an easily wettable, large-void asphalt mixture includes the following steps:

[0017] The aggregate, mineral powder and cement are mixed evenly, then water is added and mixed evenly to completely wet the surface of the aggregate. Finally, emulsified asphalt is added and mixed evenly to form an asphalt mixture.

[0018] In summary, this application has the following beneficial effects:

[0019] 1. In the mixture of this application, the interface modifier and silane coupling agent are compounded, which not only makes the asphalt uniformly coat the stone in the mixture to form an asphalt film; but also after grouting, the asphalt is almost completely bonded to the cement paste, thus forming a very uniform asphalt film between the cement paste and the stone, without the situation of "thickness on one side and thinness on the other", effectively strengthening the interface, thereby effectively improving the problem of many voids and micro-defects in the interface of composite materials, which greatly affects the performance of composite materials.

[0020] 2. In addition to improving the interfacial strength between asphalt and aggregate in the mixture, the silane coupling agent in this application compensates for the loss of freeze-thaw resistance caused by the addition of interfacial regulators, resulting in the optimal comprehensive performance of the semi-flexible pavement material prepared from large-void asphalt mixture. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the embodiments.

[0022] Example

[0023] This application provides an easily wettable, large-void asphalt mixture, the raw materials of which include the following components by weight: 90-94.5 parts aggregate, 2-4 parts mineral powder, 1-3 parts cement, 2.5-5.5 parts emulsified asphalt, and 2.5-3.5 parts water;

[0024] The raw materials for emulsified asphalt include the following components by weight: 50-60 parts asphalt, 40-50 parts water, 0.1-0.5 parts thickener, 2.0-3.5 parts emulsifier, 1-3 parts silane coupling agent, and 2-6 parts interface modifier.

[0025] in:

[0026] The interface modifier includes at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, and hydroxypropyl methacrylate.

[0027] The silane coupling agent includes at least one of KH550, KH570, and DB570.

[0028] Asphalt is one of the following: base asphalt, SBS modified asphalt, and high-viscosity modified asphalt.

[0029] The cement is PO42.5 silicate cement.

[0030] The aggregates include at least one of basalt, limestone, and diabase.

[0031] The density of the aggregate is 2.80-2.88 g / cm³. 3 The density of the mineral powder is 2.24-2.28 g / cm³. 3 .

[0032] Thickeners include cellulose ethers and their derivatives, and the viscosity of thickeners is 50,000-100,000 cps.

[0033] The emulsifier includes anionic emulsifiers. In this specific embodiment, a slow-cracking anionic emulsifier with the model number kzw-803y is preferred.

[0034] The preparation method of emulsified asphalt includes the following steps:

[0035] S1. Heat the water to 60-70℃;

[0036] S2. Mix the emulsifier, thickener and water to form a soap solution;

[0037] S3. Heat the asphalt to 130-140℃, mix it with soap solution and grind it to form an emulsion;

[0038] S4. After the emulsion cools, add the silane coupling agent and interface regulator, and stir evenly to form emulsified asphalt.

[0039] This application embodiment also provides a method for preparing an easily wettable, large-void asphalt mixture, including the following steps: adding aggregates, mineral powder and cement into a mixing pot in proportion and mixing evenly, then adding water and mixing evenly to completely wet the surface of the aggregates, and finally adding emulsified asphalt and mixing evenly to form an asphalt mixture.

[0040] The following is an illustration through specific examples.

[0041] Example 1

[0042] An easily wettable, high-porosity asphalt mixture, the raw materials of which are:

[0043] 90 parts aggregate, 3 parts mineral powder, 1 part cement, 3 parts emulsified asphalt, and 3 parts water.

[0044] The aggregate gradation design is shown in Table 1:

[0045] Table 1. Grading Design Table for Example 1

[0046]

[0047] The aggregate used is basalt aggregate with a density of 2.82 g / cm³. 3 The mineral powder used is limestone powder with a density of 2.28 g / cm³. 3 .

[0048] The preparation method of emulsified asphalt in this embodiment includes the following steps:

[0049] Raw material preparation: 52 parts asphalt, 40 parts water, 0.2 parts thickener, 2.8 parts emulsifier, 2 parts silane coupling agent, and 3 parts interface modifier. The asphalt is base asphalt with a penetration of 68 (0.1 mm, 25℃, 100 g), softening point of 48℃, and ductility of 34 cm at 5℃. The thickener is cellulose ether with a viscosity of 100,000 cps. The interface modifier is hydroxyethyl methacrylate. The silane coupling agent is KH550.

[0050] Preparation of emulsified asphalt:

[0051] S1. Heat the water to 60-70℃;

[0052] S2. Mix the emulsifier, cellulose ether and water in a certain proportion to form a soap solution;

[0053] S3. Heat the base bitumen to 130-140℃, mix it with soap solution in proportion, and grind it in a colloid mill to form an emulsion.

[0054] S4. After the emulsion cools, add silane coupling agent and hydroxyethyl methacrylate respectively, and stir evenly to form emulsified asphalt.

[0055] This embodiment also provides a method for preparing asphalt mixture, comprising the following steps:

[0056] Aggregates, mineral powder and cement are added to a mixing pot in proportion and mixed evenly. Then water is added and mixed evenly to completely wet the surface of the aggregates. Finally, emulsified asphalt is added and mixed evenly to form an asphalt mixture.

[0057] Example 2

[0058] An easily wettable, high-porosity asphalt mixture, the raw materials of which are:

[0059] 89 parts aggregate, 2.5 parts mineral powder, 2 parts cement, 3.5 parts emulsified asphalt, and 3 parts water.

[0060] The aggregate gradation design is shown in Table 2:

[0061] Table 2. Grading Design Table for Example 2

[0062]

[0063] The aggregate used is basalt aggregate with a density of 2.80 g / cm³.3 The mineral powder used is limestone powder with a density of 2.26 g / cm³. 3 .

[0064] The preparation method of emulsified asphalt in this embodiment includes the following steps:

[0065] Raw material preparation: 50 parts asphalt, 41 parts water, 0.2 parts thickener, 2.5 parts emulsifier, 2.5 parts silane coupling agent, and 3.8 parts interface modifier. The asphalt is base asphalt with a penetration of 66 (0.1 mm, 25℃, 100 g), softening point of 49℃, and ductility of 28 cm at 5℃. The thickener is cellulose ether with a viscosity of 50,000 cps. The interface modifier is hydroxypropyl methacrylate. The silane coupling agent is KH550.

[0066] Preparation of emulsified asphalt:

[0067] S1. Heat the water to 60-70℃;

[0068] S2. Mix the emulsifier, cellulose ether and water in a certain proportion to form a soap solution;

[0069] S3. Heat the base bitumen to 130-140℃, mix it with soap solution in proportion, and grind it in a colloid mill to form an emulsion.

[0070] S4. After the emulsion cools, add silane coupling agent and hydroxypropyl methacrylate respectively, and stir evenly to form emulsified asphalt.

[0071] This embodiment also provides a method for preparing asphalt mixture, comprising the following steps:

[0072] Aggregates, mineral powder and cement are added to a mixing pot in proportion and mixed evenly. Then water is added and mixed evenly to completely wet the surface of the aggregates. Finally, emulsified asphalt is added and mixed evenly to form an asphalt mixture.

[0073] Example 3

[0074] An easily wettable, high-porosity asphalt mixture, the raw materials of which are:

[0075] 90 parts aggregate, 3 parts mineral powder, 1.5 parts cement, 3 parts emulsified asphalt, and 2.5 parts water.

[0076] The aggregate gradation design is shown in Table 3:

[0077] Table 3. Graded Design Table for Example 3

[0078]

[0079] The aggregate used is basalt aggregate with a density of 2.85 g / cm³. 3The mineral powder used is limestone powder with a density of 2.24 g / cm³. 3 .

[0080] The preparation method of emulsified asphalt in this embodiment includes the following steps:

[0081] Raw material preparation: 53 parts asphalt, 39 parts water, 0.1 parts thickener, 2.5 parts emulsifier, 2.5 parts silane coupling agent, and 2.9 parts interface modifier. The asphalt is base asphalt with a penetration of 69 (0.1 mm, 25℃, 100 g), softening point of 46℃, and ductility of 30 cm at 5℃. The thickener is cellulose ether with a viscosity of 75,000 cps. The interface modifier is hydroxypropyl methacrylate. The silane coupling agent is KH550.

[0082] Preparation of emulsified asphalt:

[0083] S1. Heat the water to 60-70℃;

[0084] S2. Mix the emulsifier, cellulose ether and water in a certain proportion to form a soap solution;

[0085] S3. Heat the base bitumen to 130-140℃, mix it with soap solution in proportion, and grind it in a colloid mill to form an emulsion.

[0086] S4. After the emulsion cools, add silane coupling agent and hydroxypropyl methacrylate respectively, and stir evenly to form emulsified asphalt.

[0087] This embodiment also provides a method for preparing asphalt mixture, comprising the following steps:

[0088] Aggregates, mineral powder and cement are added to a mixing pot in proportion and mixed evenly. Then water is added and mixed evenly to completely wet the surface of the aggregates. Finally, emulsified asphalt is added and mixed evenly to form an asphalt mixture.

[0089] Example 4

[0090] An easily wettable, high-porosity asphalt mixture, the raw materials of which are:

[0091] 94.5 parts aggregate, 2 parts mineral powder, 1 part cement, 5.5 parts emulsified asphalt, and 2.5 parts water.

[0092] The aggregate gradation design is shown in Table 4:

[0093] Table 4. Graded Design Table for Example 4

[0094]

[0095] The aggregate used is basalt aggregate with a density of 2.80 g / cm³. 3The mineral powder used is limestone powder with a density of 2.24 g / cm³. 3 .

[0096] The preparation method of emulsified asphalt in this embodiment includes the following steps:

[0097] Raw material preparation: 50 parts asphalt, 50 parts water, 0.1 parts thickener, 2.8 parts emulsifier, 1 part silane coupling agent, and 6 parts interface modifier. The asphalt is base asphalt with a penetration of 68 (0.1 mm, 25℃, 100 g), softening point of 48℃, and ductility of 34 cm at 5℃. The thickener is cellulose ether with a viscosity of 100,000 cps. The interface modifier is hydroxyethyl acrylate. The silane coupling agent is KH550.

[0098] Preparation of emulsified asphalt:

[0099] S1. Heat the water to 60-70℃;

[0100] S2. Mix the emulsifier, cellulose ether and water in a certain proportion to form a soap solution;

[0101] S3. Heat the base bitumen to 130-140℃, mix it with soap solution in proportion, and grind it in a colloid mill to form an emulsion.

[0102] S4. After the emulsion cools, add silane coupling agent and hydroxyethyl acrylate respectively, and stir evenly to form emulsified asphalt.

[0103] This embodiment also provides a method for preparing asphalt mixture, comprising the following steps:

[0104] Aggregates, mineral powder and cement are added to a mixing pot in proportion and mixed evenly. Then water is added and mixed evenly to completely wet the surface of the aggregates. Finally, emulsified asphalt is added and mixed evenly to form an asphalt mixture.

[0105] Example 5

[0106] An easily wettable, high-porosity asphalt mixture, the raw materials of which are:

[0107] 89 parts aggregate, 2 parts mineral powder, 1 part cement, 5.5 parts emulsified asphalt, and 2.5 parts water.

[0108] The aggregate gradation design is shown in Table 5:

[0109] Table 5. Graded Design Table for Example 5

[0110]

[0111] The aggregate used is basalt aggregate with a density of 2.88 g / cm³. 3 The mineral powder used is limestone powder with a density of 2.25 g / cm³.3 .

[0112] The preparation method of emulsified asphalt in this embodiment includes the following steps:

[0113] Raw material preparation: 60 parts asphalt, 39 parts water, 0.1 parts thickener, 2.5 parts emulsifier, 3 parts silane coupling agent, and 2 parts interface modifier. The asphalt is base asphalt with a penetration of 68 (0.1 mm, 25℃, 100 g), softening point of 48℃, and ductility of 34 cm at 5℃. The thickener is cellulose ether with a viscosity of 100,000 cps. The interface modifier is hydroxypropyl acrylate. The silane coupling agent is KH550.

[0114] Preparation of emulsified asphalt:

[0115] S1. Heat the water to 60-70℃;

[0116] S2. Mix the emulsifier, cellulose ether and water in a certain proportion to form a soap solution;

[0117] S3. Heat the base bitumen to 130-140℃, mix it with soap solution in proportion, and grind it in a colloid mill to form an emulsion.

[0118] S4. After the emulsion cools, add silane coupling agent and hydroxypropyl acrylate respectively, and stir evenly to form emulsified asphalt.

[0119] This embodiment also provides a method for preparing asphalt mixture, comprising the following steps:

[0120] Aggregates, mineral powder and cement are added to a mixing pot in proportion and mixed evenly. Then water is added and mixed evenly to completely wet the surface of the aggregates. Finally, emulsified asphalt is added and mixed evenly to form an asphalt mixture.

[0121] Comparative Example

[0122] Comparative Example 1

[0123] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not contain a silane coupling agent.

[0124] Comparative Example 2

[0125] The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 does not contain silane coupling agents and interface modifiers.

[0126] Comparative Example 3

[0127] The difference between Comparative Example 3 and Example 1 is that Comparative Example 3 does not contain an interface regulator.

[0128] Comparative Example 4

[0129] The difference between Comparative Example 4 and Example 1 is that the amount of the interface regulator used is 10 parts.

[0130] Comparative Example 5

[0131] The difference between Comparative Example 5 and Example 1 is that the amount of silane coupling agent used is 8 parts.

[0132] Performance testing

[0133] (1) The large-void asphalt mixture described in the examples and comparative examples needs to be formed in a two-stage molding process. After the initial rolling / compaction, it needs to be cured in an environment of 110℃ for 24 hours, and then rolled / compacted again. After preparation, it can be left to stand at room temperature for 24 hours before road performance testing. The testing method refers to JTG E20-2011 "Test Procedures for Highway Asphalt and Asphalt Mixtures".

[0134] (2) The large-void asphalt mixtures obtained in the examples and comparative examples were also subjected to secondary rolling / compaction. After completion, they were allowed to stand at room temperature for 24 hours before being injected with JGM-301 special grout (produced by Jiangsu Subote New Material Co., Ltd., with a water-cement ratio of 0.32) to obtain semi-flexible pavement materials. The road performance of the semi-flexible pavement materials was tested, and the test method referred to JTG E20-2011 "Test Procedures for Highway Asphalt and Asphalt Mixtures".

[0135] The test results are shown in Tables 6 and 7.

[0136] Table 6 Comparison of Road Performance of Large-Porosity Asphalt Mixtures

[0137] Test metrics Porosity / % Stability / kN Scattered / % Example 1 22.3 3.5 18.7 Example 2 21.9 3.2 19.6 Example 3 22.1 3.1 17.8 Example 4 23.0 3.7 19.6 Example 5 21.5 3.3 18.9 Comparative Example 1 22.8 3.6 20.5 Comparative Example 2 23 3.2 21.3 Comparative Example 3 22.5 3.0 18.1 Comparative Example 4 22.7 3.1 17.2 Comparative Example 4 22.5 3.3 18.9

[0138] Table 7 Comparison of Road Performance of Semi-Flexible Pavement Materials After Grouting

[0139] Test metrics Stability / kN Low temperature bending tensile strain / με Freeze-thaw strength ratio / % Example 1 15.6 1982 85.6 Example 2 16.8 1875 89.2 Example 3 15.9 2050 87.2 Example 4 16.2 2133 88.7 Example 5 16.5 1973 86.1 Comparative Example 1 15.5 1770 68.7 Comparative Example 2 15.2 1432 79.8 Comparative Example 3 15.5 1508 82.5 Comparative Example 4 10.7 1898 84.9 Comparative Example 5 12.8 2152 90.3

[0140] According to the performance tests in Table 1, it can be found that the components in the mixture of this application do not significantly affect the basic performance of the mixture as a skeleton. Further analysis of Table 2 shows that the mixture in the embodiments of this application still exhibits good stability after grouting, indicating that the mixture of this application does not negatively affect the rigidity and other properties of the cement slurry. Meanwhile, after grouting, the mixture of the embodiments of this application exhibits excellent low-temperature flexural strain and freeze-thaw strength ratio, indicating that after grouting, there is good interfacial strength and interfacial bonding performance between the cement slurry and asphalt, and between the asphalt and the aggregates in the mixture. This is because after grouting, the mixture of this application, with the cooperation of silane coupling agent and interface regulator, not only ensures good wettability of the cement slurry on the asphalt, allowing the asphalt to fully bond between the aggregates and the cement slurry, but also simultaneously strengthens both interfaces, resulting in a very uniform asphalt film without any unevenness. This effectively improves the numerous voids and micro-defects at the interface of the composite material, improving the performance of the semi-flexible pavement.

[0141] Furthermore, combining the performance of Comparative Example 2, it was found that without the use of silane coupling agents and interface modifiers, the grouting material in Comparative Example 2 struggled to wet the asphalt surface in the large-void asphalt mixture, resulting in numerous micro-defects. Consequently, the interfacial crack resistance was weak, and the low-temperature flexural strain index of the semi-flexible pavement material was low. Moreover, further combining the performance of Comparative Example 1, it was found that the use of interface modifiers in Comparative Example 1 resulted in a worse freeze-thaw strength ratio than in Comparative Example 2. This indicates that using interface modifiers alone leads to a loss of freeze-thaw resistance in semi-flexible pavements. This demonstrates a synergistic relationship between silane coupling agents and interface modifiers, resulting in a complementary effect that provides good interfacial strength and bonding between asphalt and cement grout, and between asphalt and aggregate, leading to excellent overall performance of the semi-flexible pavement.

[0142] Further analysis of Comparative Examples 1 and 3 revealed that Comparative Example 1, without the use of a silane coupling agent, showed a greater decrease in the freeze-thaw strength ratio of the semi-flexible pavement. Comparative Example 3, without the use of an interface modifier, showed an even greater decrease in the low-temperature flexural strain of the semi-flexible pavement. This indicates that the silane coupling agent primarily acts between the asphalt and the aggregate in the mixture, while the interface modifier mainly acts between the asphalt and the cement paste.

[0143] Analysis of the performance of Comparative Example 4 revealed that although the dosage of the interface modifier was increased, the low-temperature flexural strain and freeze-thaw strength ratio not only failed to improve significantly, but also led to a substantial decrease in the stability of the semi-flexible pavement. This is because the interface modifier contains hydroxyl groups, and when the dosage is too high, they react with free Ca in the alkaline medium of cement hydration products. 2+ The formation of unstable complexes controls the Ca content in the liquid phase during the initial stages of hydration. 2+The concentration of hydroxyl groups leads to the phenomenon of delayed setting in cement-based materials. Secondly, hydroxyl groups readily associate with water molecules through hydrogen bonds, and combined with the hydrogen bonds between water molecules, this forms a stable solvated water film on the surface of cement particles, preventing direct contact between cement particle bonds and hindering hydration. Furthermore, carboxyl compounds readily react with free Ca2+. 2+ Insoluble calcium salts are formed and precipitate on the surface of cement particles, thereby slowing down the cement hydration rate.

[0144] Analysis of the performance of Comparative Example 5 revealed that while increasing the dosage of silane coupling agent improved the low-temperature flexural strain and freeze-thaw strength ratio, it significantly reduced the stability of the semi-flexible pavement. This is because, in addition to its interfacial interaction with asphalt and aggregate, the silane coupling agent also works with interfacial modifiers to strengthen the interfacial strength between cement grout and asphalt. Excessive silane coupling agent dosage leads to the excessive binding of its polar inorganic molecular groups to cement particles. Simultaneously, the excessive amino functional groups in the silane coupling agent deviate from the cement particles, resulting in a hydrophobic surface on the cement-based material particles. This prevents water molecules from penetrating the cement particle surface, thus inhibiting the hydration of the cement-based grouting material and negatively impacting strength.

[0145] As can be seen from Comparative Examples 4 and 5, the amount of silane coupling agent and interface modifier used in this application is very important. Only by adding an appropriate amount of silane coupling agent and interface modifier to the semi-flexible pavement material can they interact better, promote interface fusion, and improve interface strength.

[0146] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A readily pervious large void asphalt mixture characterized by: The raw materials include the following components by weight parts: aggregate 89-94.5 parts, mineral powder 2-4 parts, cement 1-3 parts, emulsified asphalt 2.5-5.5 parts, water 2.5-3.5 parts; The raw materials of the emulsified asphalt include the following components by weight parts: asphalt 50-60 parts, water 39-50 parts, thickening agent 0.1-0.5 parts, emulsifier 2.0-3.5 parts, silane coupling agent 1-3 parts, interface control agent 2-6 parts; the interface control agent includes at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate.

2. The easily-infiltrated large-void asphalt mixture according to claim 1, characterized in that: The silane coupling agent includes at least one of KH550, KH570, DB570.

3. The easily pervious large void asphalt mixture according to claim 1, characterized in that: The cement is PO42.5 Portland cement.

4. The easily pervious large void asphalt mixture according to claim 1, characterized in that: The aggregate includes at least one of basalt, limestone, diabase.

5. The easily pervious large void asphalt mixture according to claim 1, characterized in that: The thickening agent includes cellulose ether and its derivatives, and the viscosity of the thickening agent is 50000-100000 cps.

6. The easily pervious large void asphalt mixture according to claim 1, characterized in that: The emulsifier includes an anionic emulsifier.

7. The easily pervious large void asphalt mixture according to claim 1, characterized in that: The density of the aggregate is 2.80-2.88 g / cm 3 The density of the mineral powder is 2.24-2.28 g / cm 3 .

8. The easily pervious large void asphalt mixture according to claim 1, characterized in that: The preparation method of the emulsified asphalt includes the following steps: S1, heat the water to 60-70℃; S2, mix and stir the emulsifier, thickening agent and water to form a soap solution; S3, heat the asphalt to 130-140℃, mix with the soap solution and grind to form an emulsion; S4, after the emulsion is cooled, add the silane coupling agent and the interface control agent, stir uniformly to form the emulsified asphalt.

9. A method of producing the easily-infiltrated large-void asphalt mixture as claimed in any one of claims 1 to 8, characterized by, The preparation method includes the following steps: mix the aggregate, mineral powder and cement uniformly, then add water, mix uniformly to make the surface of the aggregate completely wet, finally add the emulsified asphalt, mix uniformly to form the asphalt mixture.

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