Semi-flexible pavement material preparation method, semi-flexible pavement material and semi-flexible pavement

Abstract

The invention discloses a preparation method of a semi-flexible pavement material, the semi-flexible pavement material and a semi-flexible pavement. The preparation method of the semi-flexible pavement material comprises the following steps: preparing an asphalt mixture; coating the surface of the asphalt mixture with the silane coupling agent solution; carrying out drying treatment on the asphalt mixture coated with the silane coupling agent; preparing cement mortar; mixing the asphalt mixture coated with the silane coupling agent with cement mortar; and carrying out forming treatment. The surface of an asphalt mixture is coated with a silane coupling agent solution, the asphalt mixture coated with a silane coupling agent is dried and then mixed with cement mortar, forming treatment is carried out, a continuous and stable interface modification layer is constructed, the technical problem that an asphalt-cement-based interface transition area is weak in bonding is solved in a targeted mode, and the bonding strength of the asphalt-cement-based interface transition area is improved. And generation and expansion of interface cracks are effectively inhibited. The semi-flexible pavement material and the semi-flexible pavement provided by the invention have relatively good crack resistance, durability and bearing stability.

Description

Technical Field

[0001] This application relates to the field of semi-flexible pavement preparation technology, and in particular to methods for preparing semi-flexible pavement materials, semi-flexible pavement materials, and semi-flexible pavements. Background Technology

[0002] Semi-flexible pavement, as an organic-inorganic composite pavement structure, is composed of asphalt mixture and cement-based materials at its core. It combines the flexibility of asphalt pavement with the high strength of cement-based materials and is widely used in road engineering. Among them, cold-mix semi-flexible pavement is more in line with the current development needs of green construction because it does not require high-temperature heating during construction, is low-carbon and environmentally friendly, and is easy to operate.

[0003] However, existing cold-mix semi-flexible pavement technology has significant drawbacks: asphalt and cement-based materials belong to organic and inorganic phases, respectively, and the interfacial transition zone (ITZ) between them is a weak point in the structure. Insufficient interfacial bonding performance easily leads to crack propagation, delamination, and other defects, directly resulting in a decrease in overall pavement durability and a shortened service life. Simultaneously, existing technologies lack targeted interfacial modification processes. Conventional modification methods mostly focus on optimizing the intrinsic properties of the materials, failing to develop precise strengthening schemes for the asphalt-cement interface. This fails to fundamentally solve the core problem of weak interfacial bonding, limiting the performance improvement and widespread application of cold-mix semi-flexible pavements. Existing technologies mostly evaluate the effects of interfacial modifiers through mechanical testing, but direct observation of the interfacial microstructure and quantitative research on performance are relatively insufficient. Summary of the Invention

[0004] To solve at least one of the above-mentioned technical problems, this application provides a method for preparing semi-flexible pavement materials, semi-flexible pavement materials, and semi-flexible pavement, and the technical solutions adopted are as follows.

[0005] The method for preparing semi-flexible pavement material provided in this application includes the following steps: Prepare asphalt mixture; The silane coupling agent solution is coated onto the surface of the asphalt mixture; Drying treatment of asphalt mixtures coated with silane coupling agents; Prepare cement mortar; The asphalt mixture coated with silane coupling agent is mixed with cement mortar; The molding process is carried out.

[0006] In some embodiments of this application, coating the surface of the asphalt mixture with the silane coupling agent solution includes: The silane coupling agent solution is sprayed onto the surface of the asphalt mixture.

[0007] In some embodiments of this application, the asphalt mixture is prepared using waterborne epoxy resin modified asphalt.

[0008] In some embodiments of this application, the drying treatment of the asphalt mixture coated with the silane coupling agent includes: Asphalt mixtures coated with silane coupling agents are treated by natural drying.

[0009] In some embodiments of this application, the preparation of asphalt mixture includes: Prepare non-stick emulsified asphalt; The aggregate gradation is determined based on the principle of maximum compaction, and the specific surface area of ​​the aggregate is calculated. The amount of asphalt used is determined based on the preset asphalt film thickness. Calculate the required amount of non-stick emulsified asphalt based on the ratio of asphalt usage to the solid content of non-stick emulsified asphalt. Weigh the aggregates, add non-stick emulsified asphalt according to the calculated ratio, and mix.

[0010] In some embodiments of this application, non-stick emulsified asphalt is mixed with aggregate until the non-stick emulsified asphalt is fully demulsified and coats the aggregate. The surface-wet emulsified asphalt pre-coated aggregate is spread out loosely to allow the moisture to evaporate.

[0011] In some embodiments of this application, a dry powder mortar for semi-flexible road surfaces is selected, and wet mortar is mixed according to a preset water-cement ratio range. Measure the relationship curve between water-cement ratio and flowability to determine the optimal water-cement ratio; Cement mortar was mixed according to the optimal water-cement ratio, and the wet density of the cement mortar was measured. By combining the wet density of cement mortar, the dry compaction gap ratio and dry compaction density of emulsified asphalt pre-coated aggregate, the mix proportions of emulsified asphalt pre-coated aggregate, dry powder mortar and water were calculated.

[0012] In some embodiments of this application, the molding process includes: The well-mixed material is placed in a rut mold, rolled by wheel, and then placed in a cement standard curing box for curing until the specified age for cement standard curing, thus obtaining a semi-flexible pavement material.

[0013] This application also provides a semi-flexible pavement material, prepared using the semi-flexible pavement material preparation method described above.

[0014] This application also provides a semi-flexible pavement, which is laid using the semi-flexible pavement material as described above.

[0015] This application has at least the following beneficial effects: by coating the surface of asphalt mixture with a silane coupling agent solution, and utilizing the characteristics of the organic groups of the silane coupling agent to combine with asphalt molecules and the inorganic groups to form chemical bonds with cement-based materials, the asphalt mixture coated with the silane coupling agent is dried and then mixed with cement mortar for molding, thus constructing a continuous and stable interface modification layer. This effectively solves the technical pain point of weak bonding in the asphalt-cement-based interface transition zone, effectively inhibits the generation and propagation of interface cracks, and significantly improves the crack resistance, durability, and load-bearing stability of the pavement.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The present application will be further illustrated below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments illustrated in the following drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0018] Figure 1 This is a schematic diagram of a method for preparing semi-flexible pavement material in one embodiment of this application; Figure 2 This is a schematic diagram of the composition of a semi-flexible pavement material in one embodiment of this application.

[0019] Figure descriptions: 100: Semi-flexible pavement material; 110: Asphalt mixture coated with silane coupling agent; 111: Aggregate; 112: Asphalt; 113: Silane coupling agent; 120: Cement mortar. Detailed Implementation

[0020] The following is combined with Figure 1 The embodiments of this application are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In the description of this application, the use of terms such as "one embodiment," "some embodiments," "an example," "some instances," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] Combination Figure 1 As shown, the method for preparing semi-flexible pavement material provided in this application includes the following steps: Prepare asphalt mixture; The silane coupling agent 113 solution was coated onto the surface of the asphalt mixture; The asphalt mixture 110 coated with silane coupling agent was dried. Prepare 120g of cement mortar; The asphalt mixture 110 coated with silane coupling agent is mixed with cement mortar 120; The molding process is carried out.

[0026] The method for preparing semi-flexible pavement materials provided in this application is carried out at room temperature and is a cold-mixing preparation method.

[0027] Prepare aggregate 111, asphalt 112, silane coupling agent 113 solution, dry mortar, and water. All raw materials must meet the basic requirements of being free of impurities and having stable performance. Among them, silane coupling agent 113 must have good hydrolytic activity and interfacial reaction activity.

[0028] Combination Figure 2 As shown, according to the conventional cold-mix asphalt mixture preparation specifications, cationic emulsified asphalt BC-1 with added non-stick additives is mixed with aggregate 111. Aggregate 111 and asphalt 112 are mixed evenly at room temperature, and asphalt 112 is evenly coated on the surface of aggregate 111 to form an asphalt mixture for later use. The asphalt is evenly coated on the aggregate and dispersed among each aggregate to form a loose mixture, where each unit is independent and non-adhesive, i.e., the asphalt mixture, forming as shown in the diagram. Figure 2 The morphology of asphalt 112 uniformly coating the surface of aggregate 111. The asphalt 112 can coat at least one unit of aggregate 111 to form a unit of asphalt mixture.

[0029] The silane coupling agent 113 solution is coated onto the surface of each asphalt mixture, ensuring a uniform coating without penetrating into the stone. This forms a uniform asphalt-cement interface modification layer, allowing the silane coupling agent 113 molecules to adhere evenly to the outer side of the asphalt organic phase layer. The organic groups of the silane coupling agent 113 molecules undergo physical adsorption and chemical bonding with the hydrophobic groups of the asphalt molecules. Simultaneously, the inorganic groups (such as alkoxy groups) of the silane coupling agent 113 molecules undergo hydrolysis to generate active silanol groups (-Si-OH), forming an asphalt mixture 110 coated with the silane coupling agent, which lays the foundation for subsequent bonding with cement mortar 120.

[0030] The asphalt mixture 110 coated with the silane coupling agent is dried until the silane coupling agent 113 forms a stable bond with the surface of the unit asphalt mixture. During this process, the silanol groups of the silane coupling agent 113 further condense to form a Si-O-Si cross-linked structure, constructing a continuous and stable interfacial transition layer on the surface of the asphalt mixture. This ensures that the silane coupling agent 113 forms a strong bond with the organic phase layer of the asphalt, and that the unreacted silanol groups remain active.

[0031] Prepare cement mortar 120, and mix asphalt mixture 110 coated with silane coupling agent with cement mortar 120. During hydrolysis, the hydrophilic groups of silane coupling agent 113 hydrolyze to generate silanol groups (Si-OH), which can chemically react with the hydration products of cement mortar 120 or grout (such as Ca(OH)2) to form Si-O-Si or Si-O-Ca bonds, enhancing interfacial adhesion and water resistance. In addition, silane coupling agent 113 can react with asphalt acid to enhance the compatibility of asphalt 112 with cement mortar 120 or grout, improve the durability of the material, and effectively reduce the impact of water damage on the interface. Furthermore, silane coupling agent 113 can react with the hydroxyl groups on the surface of aggregate 111 to form strong chemical bonds, simultaneously improving the interfacial adhesion between aggregate and emulsified asphalt.

[0032] Prepare a preform of a predetermined shape and size, place the uniformly mixed composite material into the preform, and use molding pressure to ensure a tighter interface bond, thus completing the preparation of the semi-flexible pavement material 100.

[0033] By coating the surface of asphalt mixture with a silane coupling agent 113 solution, the organic groups of silane coupling agent 113 are combined with asphalt molecules, and the inorganic groups are chemically bonded with cement-based materials. The modification effect of each unit is consistent, and the mechanical properties and durability of the final material are uniform. After drying the asphalt mixture 110 coated with silane coupling agent, it is mixed with cement mortar 120 and molded to construct a continuous and stable interface modification layer. This effectively solves the technical problem of weak bonding in the asphalt-cement-based interface transition zone, effectively inhibits the generation and propagation of interface cracks, and significantly improves the crack resistance, durability and load-bearing stability of the pavement.

[0034] In some embodiments, coating the surface of an asphalt mixture with a silane coupling agent 113 solution includes: coating the surface of the asphalt mixture with the silane coupling agent 113 solution by spraying. The silane coupling agent 113 solution is uniformly sprayed onto the loose, non-adhesive surface of the asphalt mixture, ensuring that the surface of the asphalt layer of each unit of asphalt mixture is coated with the silane coupling agent 113 solution without omissions or localized accumulation. The mist spraying can specifically cover the surface of the asphalt layer of each individual unit of asphalt mixture, resulting in a uniform silane film on each individual unit of asphalt mixture. Subsequent hydrolysis and cross-linking reactions are consistent, and the interfacial bonding strength of each individual unit of asphalt mixture is uniform.

[0035] In some embodiments, the asphalt mixture is prepared using waterborne epoxy resin modified asphalt. Before mixing the asphalt with the aggregate, asphalt 112 is mixed with waterborne epoxy resin to obtain waterborne epoxy resin modified asphalt. Subsequently, the waterborne epoxy resin modified asphalt is mixed with the aggregate to obtain the asphalt mixture. The waterborne epoxy resin can be uniformly dispersed in a cationic emulsified asphalt aqueous solution, and the two have good compatibility. During the modification process, the waterborne epoxy resin can improve the bonding performance of asphalt 112 and enhance the toughness of the grout, thereby improving the stress resistance of the composite interface and effectively reducing interface cracking. Silane coupling agent 113 can reduce water erosion of the interface through silanol groups (Si-OH), and react chemically with the hydration products (such as Ca(OH)2) of cement mortar 120 / grout to generate a siloxane network structure, enhancing the chemical bonding force and water resistance of the interface. Meanwhile, the waterborne epoxy resin forms a highly cross-linked network structure, significantly improving the waterproof performance of the grout and reducing the problem of asphalt 112 peeling caused by moisture. In addition, silane coupling agent 113 can prevent moisture from entering the interface, while waterborne epoxy resin improves the hydrolysis resistance of the asphalt film. The two work synergistically to optimize and improve the interface, further enhancing the durability and crack resistance of the material.

[0036] In some embodiments, the drying treatment of the asphalt mixture 110 coated with silane coupling agent includes: treating the asphalt mixture 110 coated with silane coupling agent by natural drying. The asphalt mixture 110 coated with silane coupling agent is loosely and evenly spread to avoid moisture accumulation in the lower layer of particles, allowing the silane on the surface of each individual unit of asphalt mixture to slowly hydrolyze and condense. Loose, natural drying ensures that each individual unit of asphalt mixture receives the same temperature and humidity environment, resulting in consistent hydrolysis and condensation reactions, with no units of asphalt mixture showing incomplete reactions. During the drying process, each unit of asphalt mixture is independent, and the silane coupling agent 113 molecules are uniformly attached to the outer side of the asphalt organic phase layer, preventing the silane layer from sticking together before curing due to moisture accumulation. This ensures uniform dispersion when subsequently mixed with cement mortar 120, with each unit of asphalt mixture having a consistent silane cross-linking layer thickness and number of chemical bonds, resulting in uniform bonding strength with cement mortar 120 and stable overall material performance.

[0037] In some embodiments, preparing an asphalt mixture includes: Prepare non-stick emulsified asphalt; The aggregate gradation is determined based on the principle of maximum compaction, and the specific surface area of ​​the aggregate is calculated. The amount of asphalt 112 used is determined based on the preset asphalt film thickness. Calculate the required amount of non-stick emulsified asphalt based on the ratio of asphalt 112 dosage to the solid content of non-stick emulsified asphalt. Weigh the aggregates, add non-stick emulsified asphalt according to the calculated ratio, and mix.

[0038] Specifically, based on the principle of maximum compaction, the aggregate gradation is determined. The aggregate specific surface area SA is calculated according to the selected gradation using the method in Appendix B.6.9 of JTGF40-2004. The asphalt film thickness of the pre-coated aggregate is determined based on performance requirements and actual conditions. The amount of asphalt 112 required per kilogram of aggregate is calculated according to formula (1). .

[0039] in, The mass of asphalt 112 required per kilogram of aggregate, in g / kg; For asphalt film thickness, in units ; The density of asphalt 112 is expressed in g / cm³, obtained through actual measurement. The specific surface area of ​​the aggregate is expressed in m² / kg and is calculated according to the method in Appendix B.6.9 of JTGF40-2004 based on the selected aggregate gradation.

[0040] Calculate the mass of non-stick emulsified asphalt required per kilogram of aggregate according to formula (2). : .

[0041] Wherein, Pb represents the solid content of non-stick emulsified asphalt, in units of %.

[0042] Weigh the aggregate and add non-stick emulsified asphalt according to the calculated ratio; mix the non-stick emulsified asphalt and aggregate at room temperature.

[0043] Further, the non-stick emulsified asphalt is mixed with the aggregate until the non-stick emulsified asphalt is fully demulsified and coats the aggregate. The surface-coated aggregate with the moistened emulsified asphalt is then spread out loosely to allow the moisture to evaporate. Stirring at room temperature allows the emulsified asphalt to slowly demulsify on the surface of each stone, resulting in an ordered arrangement of the asphalt 112 molecules, forming a denser asphalt layer with more fully exposed hydrophobic groups. Loose placement allows the moisture in each unit of asphalt mixture to evaporate quickly, preventing residual moisture from affecting the subsequent silane hydrolysis reaction.

[0044] At room temperature, non-stick emulsified asphalt and aggregates are mixed until the non-stick emulsified asphalt is fully broken down and coated with aggregates. The pre-coated aggregates with moist emulsified asphalt are spread out loosely to allow the moisture to evaporate fully, thus preparing loose and dry pre-coated aggregates with emulsified asphalt.

[0045] The dry compaction density of pre-coated emulsified asphalt aggregate was determined according to the method in "Test Procedures for Aggregates in Highway Engineering" (JTG3432—2024) T0309-2005. The unit is g / cm3; the apparent density of emulsified asphalt pre-coated aggregate was determined according to the method in "Specifications for Testing Aggregates in Highway Engineering" (JTG3432—2024) T0304-2024. The unit is g / cm3; then the dry compaction gap ratio of the pre-coated aggregate with emulsified asphalt is calculated according to formula (3). The unit is %, and equation (3) is: .

[0046] In some embodiments, a dry powder mortar for semi-flexible pavement is selected, and wet mortar is mixed according to a preset water-cement ratio range. Measure the relationship curve between water-cement ratio and flowability to determine the optimal water-cement ratio; Cement mortar 120 was prepared according to the optimal water-cement ratio, and the wet density of cement mortar 120 was measured. Based on the wet density of cement mortar 120, the dry compaction gap ratio and dry compaction density of emulsified asphalt pre-coated aggregate, the mix proportions of emulsified asphalt pre-coated aggregate, dry powder mortar, and water were calculated. The emulsified asphalt pre-coated aggregate was coated with silane coupling agent 113 and allowed to dry naturally before being mixed with dry powder mortar and water.

[0047] Select the appropriate dry-mix mortar for semi-flexible pavements as needed. Mix wet mortar within the recommended water-cement ratio range, determine the relationship between water-cement ratio and flowability, and identify the optimal water-cement ratio. Prepare cement mortar 120 according to the optimal water-cement ratio, and measure the wet density of this cement mortar 120. Unit: g / cm3; The mass percentages of pre-coated aggregate and cement mortar 120 in emulsified asphalt are calculated using equations (4) and (5): .

[0048] .

[0049] in, , These represent the mass percentages of pre-coated emulsified asphalt aggregate and cement mortar (120%), respectively. The wet density of cement mortar 120 is expressed in g / cm3 and was obtained through actual measurement. The dry compaction gap ratio of pre-coated emulsified asphalt aggregate is expressed in % (%). The dry compaction density of pre-coated aggregate with emulsified asphalt, in g / cm3; Based on the calculation results and water-cement ratio, the mix proportion can be obtained, which is the ratio of emulsified asphalt pre-coated aggregate, dry powder mortar, and water; the aggregate gradation used is the SFAC-16 gradation of the T / CECS1016-2022 standard. The optimal water-cement ratio ensures that the mortar has moderate fluidity, which can coat each unit of asphalt mixture without causing settlement due to excessive thinness. Based on the calculation results and water-cement ratio, the mix proportion can be obtained. Cement mortar 120 can completely fill the voids between units of asphalt mixture, avoid the formation of voids, and allow each unit of asphalt mixture to be chemically bonded to the mortar.

[0050] In some embodiments, the molding process includes: placing the uniformly mixed material into a rut slab mold, molding it by wheel rolling, and then curing it in a cement standard curing chamber until the specified age for cement standard curing, thereby obtaining semi-flexible pavement material 100. Wheel rolling molding can fully compact the mixture, avoid internal voids, ensure uniform material density, improve structural strength, and the standardized molding and curing process avoids the influence of environmental factors on material performance, ensuring that the strength, durability, and other indicators of the finished material are stable and consistent.

[0051] A specific embodiment is given, and an interface strength test is performed.

[0052] (1) Procurement rules and dimensions ( The diabase and granite stones used in the stone materials all come from the Guangzhou stone market. (2) Weigh the aggregates, wash the diabase and granite clean, place them in a 135℃ oven and dehydrate for 6 hours, then adjust the temperature to 175℃ and dry for 2 hours; (3) Prepare non-stick emulsified asphalt. At room temperature, add non-stick emulsified asphalt according to the calculated ratio and mix. Place the upper surface of the specimen on asphalt 112 and let it stand for 3-5 seconds to allow the non-stick emulsified asphalt to flow evenly on the surface of the specimen. Then, spread the specimen indoors to dry. Coat the surface of the asphalt mixture with silane coupling agent 113 solution and let the specimen dry naturally indoors to ensure that the silane coupling agent evenly covers the interface, forming asphalt mixture 110 coated with silane coupling agent. (4) The mix proportions of emulsified asphalt pre-coated aggregate, dry powder mortar and water were calculated. The cement mortar was prepared according to the standard preparation procedure using a laboratory cement mortar 120 mixer and the optimal water-cement ratio recommended by the manufacturer. The mixed cement-based grout was poured onto asphalt mixture 110 coated with silane coupling agent, mixed and placed in a standard curing box for curing. After the cement-based grout hardened, it was demolded and then placed in a standard curing box for curing for 28 days to achieve the optimal strength performance of the cement-based grout. Then the pull-out test specimen joint was bonded and a pull-out test was carried out.

[0053] (5) After curing to the prescribed age, place the specimens at 25°C. The chamber was kept at a constant temperature for 12 hours, and a uniaxial tensile test was performed using a universal testing machine at a tensile rate of 1 mm / min.

[0054] Experiments have shown that the semi-flexible pavement material 100 prepared by the method provided in this application has high strength and significantly improves the overall mechanical properties and stability of the material.

[0055] This application also provides a semi-flexible pavement material 100, prepared using the semi-flexible pavement material preparation method described above. The semi-flexible pavement material 100 prepared by the semi-flexible pavement material preparation method provided in this application has good overall mechanical properties and stability.

[0056] This application also provides a semi-flexible pavement, which is laid using the semi-flexible pavement material 100 as described above. The semi-flexible pavement prepared by the semi-flexible pavement material 100 provided in this application has both high compressive strength and good crack resistance, and can withstand repeated rolling by heavy vehicles. It can meet the high strength requirements of high-grade highways and also adapt to the anti-skid and noise reduction requirements of urban roads. It has a wide range of applications and strong practicality.

[0057] The preparation method of semi-flexible pavement materials and other components and operations of semi-flexible pavement are already recorded in the relevant technology for those skilled in the art, and will not be described in detail here. The following will introduce the preparation method of semi-flexible pavement materials and the structure of semi-flexible pavement.

[0058] The contents of this application are described in detail below with reference to specific embodiments. It should be noted that the following description is merely illustrative and not a specific limitation of this application.

[0059] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A method for preparing a semi-flexible pavement material, characterized in that, Includes the following steps: Prepare asphalt mixture; The silane coupling agent solution is coated onto the surface of the asphalt mixture; Drying treatment of asphalt mixtures coated with silane coupling agents; Prepare cement mortar; The asphalt mixture coated with silane coupling agent is mixed with cement mortar; The molding process is carried out.

2. The method for preparing semi-flexible pavement material according to claim 1, characterized in that, The process of coating the asphalt mixture surface with the silane coupling agent solution includes: The silane coupling agent solution is sprayed onto the surface of the asphalt mixture.

3. The method for preparing semi-flexible pavement material according to claim 1, characterized in that: The asphalt mixture is prepared using water-based epoxy resin modified asphalt.

4. The method for preparing semi-flexible pavement material according to claim 1, characterized in that, The drying treatment of asphalt mixture coated with silane coupling agent includes: Asphalt mixtures coated with silane coupling agents are treated by natural drying.

5. The method for preparing semi-flexible pavement material according to claim 1, characterized in that, The preparation of the asphalt mixture includes: Prepare non-stick emulsified asphalt; The aggregate gradation is determined based on the principle of maximum compaction, and the specific surface area of ​​the aggregate is calculated. The amount of asphalt used is determined based on the preset asphalt film thickness. Calculate the required amount of non-stick emulsified asphalt based on the ratio of asphalt usage to the solid content of non-stick emulsified asphalt. Weigh the aggregates, add non-stick emulsified asphalt according to the calculated ratio, and mix.

6. The method for preparing semi-flexible pavement material according to claim 5, characterized in that: Mix the non-stick emulsified asphalt with the aggregate until the non-stick emulsified asphalt is fully broken down and coats the aggregate. Spread the pre-coated aggregate with the moistened emulsified asphalt loosely to allow the moisture to evaporate.

7. The method for preparing semi-flexible pavement material according to claim 6, characterized in that: Select a dry powder mortar specifically for semi-flexible pavements and test mix wet mortar within the preset water-cement ratio range; Measure the relationship curve between water-cement ratio and flowability to determine the optimal water-cement ratio; Cement mortar was mixed according to the optimal water-cement ratio, and the wet density of the cement mortar was measured. By combining the wet density of cement mortar, the dry compaction gap ratio and dry compaction density of emulsified asphalt pre-coated aggregate, the mix proportions of emulsified asphalt pre-coated aggregate, dry powder mortar and water were calculated.

8. The method for preparing semi-flexible pavement material according to claim 1, characterized in that, The molding process includes: The well-mixed material is placed in a rut mold, rolled by wheel, and then placed in a cement standard curing box for curing until the specified age for cement standard curing, thus obtaining a semi-flexible pavement material.

9. A semi-flexible pavement material, characterized in that, Prepared using the semi-flexible pavement material preparation method as described in any one of claims 1 to 8.

10. A semi-flexible pavement, characterized in that, Laying using the semi-flexible pavement material as described in claim 9.

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