A recycled aggregate road repair asphalt patch material and method of making

Abstract

The present application belongs to the field of road repair asphalt material, and provides a recycled aggregate road repair asphalt repair material and a preparation method thereof. The recycled aggregate road repair asphalt repair material is prepared by using interface densification recycled aggregate intermediates, reactive recycled micro-powder intermediates and reactive recycled emulsion intermediates in a synergistic design, and is compounded with natural limestone aggregate, basalt aggregate and asphalt pavement milling material fine material, so as to realize higher early strength, storage construction stability, high interface densification bearing capacity and low-temperature anti-cracking freeze-thaw durability under normal temperature construction conditions, solve the problem that the multi-target performance of the existing recycled aggregate road repair material is difficult to be considered, and is suitable for road pit and groove repair and rapid maintenance.

Description

Technical Field

[0001] This invention relates to the field of asphalt materials for road repair, specifically to a recycled aggregate asphalt repair material for road repair and its preparation method. Background Technology

[0002] As the service life of urban roads, highway ramps, bridge abutments, and municipal maintenance nodes continues to increase, defects such as potholes, loosening, cracking, and localized spalling are frequently occurring. This necessitates repair materials capable of rapid treatment without significantly disrupting existing traffic flow, and adaptable to fluctuating temperatures, residual moisture in the base layer, and complex vehicle loads. For these scenarios, asphalt repair materials not only need to be adaptable to ambient temperature construction, suitable mixing and dispersibility, and stable storage and construction conditions, but also need to form a reliable load-bearing structure within a short time to ensure smooth transitions between paving, compaction, and traffic reopening, preventing secondary loosening, edge erosion, and early cracking in the repaired area. Simultaneously, with the deepening of the recycling concept, the high-value utilization of recycled concrete aggregates, attached mortar powder, and milled aggregate fines is gaining importance. This further demands that materials achieve a more balanced performance configuration in terms of aggregate interface stability, continuous bonding, low-temperature deformation coordination, water damage resistance, and freeze-thaw service reliability, thereby balancing resource recycling, engineering efficiency, and long-term service safety.

[0003] Existing technologies have explored road repair and recycled asphalt materials extensively. For example, patent CN106477974A discloses a glass fiber and water-based epoxy emulsified asphalt road repair material, which constructs a repair system using recycled old aggregates, new aggregates, reinforcing fibers, and water-based epoxy emulsified asphalt. Patent CN114477855A discloses a recycled asphalt concrete and its application, which uses recycled aggregates, new aggregates, modified asphalt, and mineral powder to form a recycled asphalt system. From the perspective of the problem of rapid room-temperature repair and high-value utilization of recycled concrete resources that this application aims to address, the above solutions still largely focus on fiber reinforcement or general recycled compatibility. There is still room for further optimization regarding the synergistic coordination between the high water absorption interface of recycled concrete aggregates, the reaction utilization of attached mortar micropowder, and the stability of emulsion storage and early load-bearing formation. In particular, more targeted solutions are needed to balance interface densification load-bearing capacity, low-temperature crack resistance, and freeze-thaw durability. Summary of the Invention

[0004] The purpose of this invention is to provide a recycled aggregate road repair asphalt patch material and its preparation method, which solves the technical problems of existing recycled aggregate road repair materials in achieving both high early strength and storage and construction stability under normal temperature construction conditions, as well as the difficulty in balancing high interface densification load-bearing capacity and low-temperature crack resistance and freeze-thaw durability.

[0005] This invention improves the interfacial stability of aggregates by using an interface densified recycled aggregate intermediate, improves the function of recycled concrete mortar powder by using a reactive recycled micro powder intermediate, and provides a stable bonding effect by using a reactive recycled emulsion intermediate, thereby achieving a synergistic match between room temperature construction, high early strength, storage construction stability and durability.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A recycled aggregate road repair asphalt patching material, comprising the following components by weight of input:

[0008] 55-75 parts of interfacial densified recycled aggregate intermediate;

[0009] 2-6 parts of reactive regenerated micro powder intermediate;

[0010] 7-12 parts of reactive regenerated emulsion intermediate;

[0011] One or more of natural limestone aggregate, basalt aggregate and asphalt pavement milling material fines, with the total of the selected components being 10 to 25 parts;

[0012] The interface-densified recycled aggregate intermediate is prepared from recycled concrete aggregate, 3-glycidyl etheroxypropyltrimethoxysilane, and silica, with a shell layer containing Si-O-Ca and Si-O-Si bonds on its surface. The shell layer has a thickness of 20 nm to 120 nm and a water absorption rate of 2.0 wt% to 3.0 wt%. The reactive recycled micro powder intermediate is prepared from recycled concrete adhering mortar micro powder, 3-glycidyl etheroxypropyltrimethoxysilane, and sodium hydroxide, with a median particle size D50 of 5 μm to 25 μm. The reactive recycled emulsion intermediate is prepared from road petroleum asphalt, epoxidized soybean oil, styrene-butadiene latex, cetyltrimethylammonium bromide, acetic acid, and deionized water, with an emulsion particle size of 0.5 μm to 5 μm and a residual binder mass fraction of 55 wt% to 70 wt%.

[0013] Furthermore, the interface-densified recycled aggregate intermediate is prepared through the following steps:

[0014] A1. Dry the recycled concrete aggregate until the free water content is no more than 1.0 wt%, and take it as 100 parts by weight;

[0015] A2. Mix 1 to 5 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 0.5 to 3 parts by weight of silica, 0.1 to 0.8 parts by weight of aqueous acetic acid solution, and 20 to 40 parts by weight of deionized water, adjust the pH to 4.0 to 5.5, and pre-hydrolyze at 20°C to 40°C for 20 to 40 minutes to obtain a pre-hydrolyzed coating solution;

[0016] A3. Apply the pre-hydrolyzed coating liquid to the surface of the recycled concrete aggregate obtained in step A1, and roll and mix at 20℃~40℃ for 15min~45min;

[0017] A4. The aggregate is cured at 50℃~70℃ for 2h~6h. The water absorption rate of the aggregate after curing is 2.0wt%~3.0wt%, thus obtaining the interface densified recycled aggregate intermediate.

[0018] Furthermore, the reactive regenerated micron powder intermediate is prepared through the following steps:

[0019] B1. The recycled concrete mortar is crushed, ground and classified to obtain 100 parts by weight of recycled concrete mortar powder with a median particle size D50 of 5μm to 25μm.

[0020] B2. Mix 0.5 to 3 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 0.1 to 1 part by weight of sodium hydroxide aqueous solution, and 10 to 30 parts by weight of deionized water, and adjust the pH to 9.0 to 10.5 to obtain the modified solution;

[0021] B3. Add the recycled concrete adhering mortar micro powder obtained in step B1 to the modified liquid and stir at 30℃~50℃ for 30min~120min;

[0022] B4. Dry at 60℃~80℃ for 4h~8h, and the moisture content after drying is not higher than 2.0wt% to obtain the reactive regenerated micro powder intermediate.

[0023] Furthermore, the reactive regenerated emulsion intermediate is prepared through the following steps:

[0024] C1. Heat 100 parts by weight of road petroleum asphalt to 120℃~135℃ to melt it, add 5 parts by weight to 15 parts by weight of epoxidized soybean oil, and keep stirring at 120℃~135℃ for 10min~30min to obtain the oil phase;

[0025] C2. Mix 0.5 to 2 parts by mass of hexadecyltrimethylammonium bromide, 0.1 to 1 part by mass of aqueous acetic acid, and 35 to 55 parts by mass of deionized water, and stir at 45°C to 65°C for 10 to 20 minutes to obtain an aqueous phase;

[0026] C3. At 3000 r / min to 6000 r / min, the oil phase obtained in step C1 is added to the aqueous phase obtained in step C2 and sheared for 10 min to 20 min to obtain a primary emulsion;

[0027] C4. Add 5 to 20 parts by weight of styrene-butadiene latex to the primary emulsion, stir at 40°C to 60°C for 10 to 30 minutes, and adjust the pH to 2.0 to 4.0;

[0028] C5. Filter to remove agglomerates with a particle size greater than 150 μm to obtain the reactive regenerated emulsion intermediate with an emulsion particle size of 0.5 μm to 5 μm and a residual binder mass fraction of 55 wt% to 70 wt%.

[0029] Furthermore, the road petroleum asphalt is No. 70 road petroleum asphalt, the solid content of the styrene-butadiene latex is 45wt%–55wt%, the epoxy value of the epoxidized soybean oil is 6.0wt%–7.5wt%, and the Si / Ca atomic ratio on the surface of the interface densified recycled aggregate intermediate is 0.10–0.60. After deducting the aqueous liquid phase component in the reactive recycled emulsion intermediate, the composite gradation of all mineral components in the recycled aggregate road repair asphalt repair material, by mass, has the following pass rates through each sieve: 13.2mm sieve: 100wt%, 9.5mm sieve: 80wt%–90wt%, 4.75mm sieve: 50wt%. The sieve sizes are as follows: t%~60wt%, 2.36mm sieve aperture 20wt%~30wt%, 1.18mm sieve aperture 10wt%~15wt%, 0.6mm sieve aperture 6wt%~10wt%, 0.3mm sieve aperture 4wt%~7wt%, 0.15mm sieve aperture 2wt%~5wt%, and 0.075mm sieve aperture 1wt%~3wt%, with the passing rate of each sieve aperture decreasing sequentially from the largest to the smallest. The Marshall stability of the recycled aggregate road repair asphalt patch material after molding is 8kN~15kN after 2 hours and 10kN~18kN after 24 hours, with a freeze-thaw splitting strength ratio of 82%~95%.

[0030] As a concept of this invention, the synergistic design of an interface-densified recycled aggregate intermediate, a reactive recycled micro-powder intermediate, and a reactive recycled emulsion intermediate is mainly used to enhance the high early strength, storage and construction stability, high interface-densified load-bearing capacity, and low-temperature crack resistance and freeze-thaw durability of recycled aggregate road repair asphalt patch material under normal temperature construction conditions. Specifically, the interface-densified recycled aggregate intermediate reduces the water absorption sensitivity of recycled concrete aggregate through a surface shell; the reactive recycled micro-powder intermediate improves the bonding state between the recycled concrete adhering mortar micro-powder and the system; and the reactive recycled emulsion intermediate provides a stabilizing cementing effect. When these three are compounded with natural limestone aggregate, basalt aggregate, and asphalt pavement milling aggregate fines, they are beneficial for the simultaneous improvement of multiple performance targets.

[0031] This invention also discloses a method for preparing recycled aggregate road repair asphalt patch material, which includes the following steps based on the mass fraction of the input materials:

[0032] S1. Take 55-75 parts of the prepared interfacial densified recycled aggregate intermediate;

[0033] S2. Take 2-6 parts of the prepared reactive regenerated micro powder intermediate;

[0034] S3. Take 7-12 parts of the prepared reactive regenerated emulsion intermediate;

[0035] S4. The interface densified recycled aggregate intermediate taken in step S1 is mixed with one or more of natural limestone aggregate, basalt aggregate and asphalt pavement milling material fines, with the total selected components being 10 to 25 parts. The mixture is then dry-mixed for the first time, and the reactive recycled micro powder intermediate taken in step S2 is added for the second dry-mixing to obtain a solid mixture.

[0036] S5. Add the reactive recycled emulsion intermediate obtained in step S3 to the solid mixture, mix at 20℃~45℃ for 90s~180s, and then mature at 20℃~45℃ for 15min~60min to obtain recycled aggregate road repair asphalt repair material.

[0037] Furthermore, the first dry mixing time in step S4 is 60s to 120s, and the second dry mixing time after adding the reactive regenerated micro powder intermediate taken in step S2 is 30s to 90s.

[0038] Furthermore, in step S5, the recycled aggregate road repair asphalt repair material obtained after maturation is packaged at 10℃~35℃, the moisture content of the material is not higher than 6.0wt% during packaging, and it is sealed and stored at 5℃~35℃ for 1d~30d.

[0039] Furthermore, steps S4 and S5 are carried out in a horizontal forced mixer, a disc mixer, or a twin-shaft mixer; the recycled aggregate road repair asphalt repair material obtained in step S5 has a paving thickness of 20mm to 80mm and a compaction number of 2 to 8 passes during construction.

[0040] Furthermore, the recycled aggregate road repair asphalt patch material obtained in step S5 is allowed to stand for 0.5h to 6h at an ambient temperature of 0℃ to 35℃ before being opened to traffic.

[0041] Furthermore, the particle size of the recycled concrete aggregate in step A1 is 2.36 mm to 13.2 mm, and the drying is carried out at 80°C to 120°C for 2 to 8 hours.

[0042] Furthermore, in step A2, the pH of the system is adjusted to 4.0-5.5 by controlling the ratio of acetic acid aqueous solution to deionized water, and the mass fraction of the acetic acid aqueous solution is 5wt%-50wt%. In step B2, the pH of the system is adjusted to 9.0-10.5 by controlling the ratio of sodium hydroxide aqueous solution to deionized water, and the mass fraction of the sodium hydroxide aqueous solution is 1wt%-20wt%.

[0043] Furthermore, the pre-hydrolysis coating liquid described in step A3 is applied to the surface of the recycled concrete aggregate by spraying or dripping, and is rolled and mixed in a drum mixer, and all the pre-hydrolysis coating liquid obtained in step A2 is applied to the surface of the recycled concrete aggregate obtained in step A1.

[0044] Furthermore, in step B3, all the recycled concrete adhering mortar powder obtained in step B1 is added to the modified liquid obtained in step B2.

[0045] Furthermore, the mass fraction of the acetic acid aqueous solution in step C2 is 5wt% to 50wt%.

[0046] Furthermore, in step C3, the oil phase is gradually added to the aqueous phase and emulsified using a high-speed shearing device.

[0047] Furthermore, the reactive regenerated emulsion intermediate is a cationic emulsion, the styrene-butadiene latex is a styrene-butadiene latex that is stable under acidic conditions, and in step C4, the pH is adjusted dropwise to 2.0-4.0 using an aqueous acetic acid solution, the mass fraction of which is 5wt%-50wt%.

[0048] Furthermore, in step C5, a 150μm sieve is used to filter and remove agglomerates.

[0049] Furthermore, the residual binder mass fraction is determined by the evaporation residue method based on the total mass of the reactive regenerated emulsion intermediate.

[0050] Furthermore, the surface of the reactive regenerated micro powder intermediate contains silanol groups and / or epoxy groups, and the residual binder of the reactive regenerated emulsion intermediate contains epoxy groups.

[0051] Furthermore, the median particle size D50 of the reactive regenerated micronized powder intermediate and the emulsion particle size of the reactive regenerated emulsion intermediate were determined by laser particle size distribution method.

[0052] Furthermore, the shell thickness was determined by electron microscopy, and the Si / Ca atomic ratio was determined by X-ray photoelectron spectroscopy.

[0053] Furthermore, the synthetic gradation of all mineral components is based on the dry basis mass of inorganic mineral components after deducting the water content in the reactive regenerated emulsion.

[0054] Furthermore, the Marshall stability and freeze-thaw splitting strength ratio were determined according to the test procedures for asphalt and asphalt mixtures in highway engineering.

[0055] As another aspect of this invention, the preparation method employing a first dry mixing, a second dry mixing, the addition of a reactive recycled emulsion intermediate, room temperature mixing, and curing is primarily used to enhance the storage and construction stability, high early strength formation, and construction adaptability of recycled aggregate road repair asphalt patch material. By first mixing the interface-densified recycled aggregate intermediate with natural limestone aggregate, basalt aggregate, and asphalt pavement milling aggregate fines, then adding the reactive recycled micro powder intermediate, and finally adding the reactive recycled emulsion intermediate while controlling the mixing and curing conditions, it is beneficial to reduce the adverse effects of local agglomeration and moisture content fluctuations, ensuring stable connections between packaging, storage, paving, compaction, and opening to traffic.

[0056] The key role of the interface-densifying recycled aggregate intermediate is to improve the stability of the surface shell of recycled concrete aggregate and the load-bearing capacity of interface densification. The Si-O-Ca and Si-O-Si bonds formed on its surface help to mitigate interface weakening caused by water absorption. The key role of the reactive recycled micro-powder intermediate is to improve the bonding state between the recycled concrete adhering mortar micro-powder and the cementitious phase, and to optimize the distribution of fine particles in the system. With the participation of the reactive recycled emulsion intermediate, the above two types of effects can be further transformed into a more continuous cementing and load-bearing path, thereby simultaneously supporting a balanced improvement in high early strength, low-temperature crack resistance, and freeze-thaw durability. However, the specific details of the effects under different moisture contents still need to be verified by further characterization.

[0057] Beneficial technical effects

[0058] 1. By forming a shell containing Si-O-Ca bonds and Si-O-Si bonds on the surface of recycled concrete aggregate, this invention can reduce the interface water absorption sensitivity and improve the interface densification degree, making it easier for the repair material to form a stable load-bearing structure after construction at room temperature, thus alleviating the problems of loose interface and water damage spread of recycled aggregate from the source.

[0059] 2. By setting up a reactive recycled micro powder intermediate and combining it with an interface-densified recycled aggregate intermediate, the present invention can improve the function of recycled concrete adhering mortar micro powder in the system, enhance the fine material filling and interface bonding effect, thereby taking into account both high early strength formation and storage construction stability, and reducing the risk of uneven mixing and early instability during normal temperature construction.

[0060] 3. By rationally compounding reactive recycled emulsion intermediates with natural limestone aggregate, basalt aggregate and asphalt pavement milling aggregate, this invention can provide continuous bonding while ensuring construction adaptability, so that the repaired area maintains good structural integrity and anti-loosening ability before and after opening to traffic.

[0061] 4. By integrating the aggregate interface, recycled concrete adhering mortar micro powder and reactive recycled emulsion intermediate, this invention is beneficial to simultaneously improve the high interface densification load-bearing capacity, low temperature crack resistance and freeze-thaw durability, and achieve the unity of high-value utilization of recycled materials and reliable service in road repair. Attached Figure Description

[0062] Figure 1 The images show the Si2p X-ray photoelectron spectra of the samples from Example 1 and Comparative Example 4 of this invention.

[0063] Figure 2 The images show the Ca2p X-ray photoelectron spectra of the samples from Example 1 and Comparative Example 4 of this invention.

[0064] Figure 3 The images show the O1s X-ray photoelectron spectra of the samples from Example 1 and Comparative Example 4 of this invention.

[0065] Figure 4 This is a statistical chart of the Si / Ca atomic ratio of the samples in Example 1 and Comparative Example 4 of the present invention.

[0066] Figure 5 This is a graph showing the correlation between water absorption rate and freeze-thaw splitting strength ratio of the samples in Example 1 and Comparative Example 4 of this invention.

[0067] Figure 6 The particle size distribution diagrams are for the reactive regenerated micro powder intermediates prepared in Example 1 and Comparative Example 5 of this invention.

[0068] Figure 7 This is a cumulative particle size distribution diagram of the reactive regenerated micro powder intermediates prepared in Example 1 and Comparative Example 5 of the present invention.

[0069] Figure 8 This is a particle size and volume distribution diagram of the reactive regenerated emulsion intermediates prepared in Example 1 and Comparative Example 6 of the present invention.

[0070] Figure 9 This is a cumulative particle size distribution diagram of the reactive regenerated emulsion intermediates prepared in Example 1 and Comparative Example 6 of the present invention.

[0071] Figure 10 This is a graph showing the relationship between curing time and Marshall stability for samples from Example 1 and Comparative Example 7 of the present invention.

[0072] Figure 11 The graph shows the relationship between storage time, remixing time, and 2-hour stability retention rate of the samples in Example 1 and Comparative Example 3 of this invention.

[0073] Figure 12 This is a macroscopic photograph of the recycled aggregate road repair asphalt patch material prepared in Example 1 of the present invention.

[0074] Figure 13 Scanning electron microscope image of the recycled aggregate road repair asphalt patch material prepared in Example 1 of the present invention. Detailed Implementation

[0075] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0076] Example 1

[0077] This embodiment provides a recycled aggregate road repair asphalt patch material, which, by weight, includes the following components: 65 parts of interface densified recycled aggregate intermediate, 4 parts of reactive recycled micro powder intermediate, 9.5 parts of reactive recycled emulsion intermediate, and 18 parts of natural limestone aggregate.

[0078] The interface densification recycled aggregate intermediate of this embodiment is prepared by the following steps: Recycled concrete aggregate with a particle size of 2.36 mm to 13.2 mm is dried at 100°C for 5 hours until the free water content is 0.5 wt%, and taken as 100 parts by weight; 3 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 1.75 parts by weight of silica, 0.45 parts by weight of acetic acid aqueous solution with a mass fraction of 25 wt%, and 30 parts by weight of deionized water are mixed, and the pH of the system is adjusted by controlling the ratio of acetic acid aqueous solution to deionized water. 4.8. Pre-hydrolyze at 30°C for 30 minutes to obtain a pre-hydrolyzed coating liquid; apply the pre-hydrolyzed coating liquid to the surface of the above-mentioned recycled concrete aggregate by spraying, and mix in a roller mixer at 30°C for 30 minutes; cure at 60°C for 4 hours. The water absorption rate of the aggregate after curing is 2.5wt%, and a shell containing Si-O-Ca bonds and Si-O-Si bonds is formed on the surface. The shell thickness is 70nm, and the surface Si / Ca atomic ratio is 0.35, thus obtaining the interface densified recycled aggregate intermediate of this embodiment.

[0079] The reactive regenerated micropowder intermediate of this embodiment is prepared by the following steps: Regenerated concrete mortar is crushed, ground, and classified to obtain 100 parts by weight of regenerated concrete mortar micropowder with a median particle size D50 of 15 μm; 1.75 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 0.55 parts by weight of a 10 wt% sodium hydroxide aqueous solution, and 20 parts by weight of deionized water are mixed, and the pH of the system is adjusted to 9.8 by controlling the ratio of sodium hydroxide aqueous solution to deionized water to obtain a modified solution; all of the above-mentioned regenerated concrete mortar micropowder is added to the modified solution and stirred at 40°C for 75 minutes; dried at 70°C for 6 hours, and the water content after drying is 1.0 wt%, thus obtaining the reactive regenerated micropowder intermediate of this embodiment, which contains silanol groups and epoxy groups on its surface, and has a median particle size D50 of 15 μm, determined by laser particle size distribution.

[0080] The reactive regenerated emulsion intermediate of this embodiment is prepared by the following steps: 100 parts by weight of No. 70 road petroleum asphalt is heated to 128°C to melt it, 10 parts by weight of epoxidized soybean oil with an epoxy value of 6.8 wt% is added, and the mixture is kept at 128°C and stirred for 20 minutes to obtain the oil phase; 1.25 parts by weight of hexadecyltrimethylammonium bromide, 0.55 parts by weight of an aqueous solution of acetic acid with a mass fraction of 25 wt% and 45 parts by weight of deionized water are mixed and stirred at 55°C for 15 minutes to obtain the aqueous phase; the oil phase is gradually added to the aqueous phase at a rotation speed of 4500 r / min using a high-speed shearing device for shearing. After 15 minutes, a primary emulsion was obtained. 12.5 parts by weight of styrene-butadiene latex with a solid content of 50 wt% under acidic conditions were added to the primary emulsion. The mixture was stirred at 50°C for 20 minutes, and the pH was adjusted dropwise to 3.0 using a 25 wt% aqueous acetic acid solution. Aggregates with a particle size greater than 150 μm were removed by filtration through a 150 μm sieve to obtain the reactive regenerated emulsion intermediate of this embodiment. This emulsion is a cationic emulsion with a particle size of 2.75 μm determined by laser particle size distribution. The residual binder mass fraction was 62.5 wt% determined by evaporation residue method, and the residual binder contained epoxy groups.

[0081] The preparation method of recycled aggregate road repair asphalt repair material in this embodiment includes the following steps: 65 parts of the prepared interface-densified recycled aggregate intermediate; 4 parts of the prepared reactive recycled micro powder intermediate; 9.5 parts of the prepared reactive recycled emulsion intermediate; the interface-densified recycled aggregate intermediate and 18 parts of natural limestone aggregate are dry-mixed for 90 seconds in a horizontal forced mixer, and then the reactive recycled micro powder intermediate is added for a second dry-mixing for 60 seconds to obtain a solid mixture; the reactive recycled emulsion intermediate is added to the solid mixture and mixed at 32.5°C for 135 seconds, and then matured at 32.5°C for 37.5 minutes to obtain recycled aggregate road repair asphalt repair material; the recycled aggregate road repair asphalt repair material obtained after maturity is packaged at 22.5°C with a material moisture content of 3.0 wt% at the time of packaging, and then sealed and stored at 20°C for 15 days.

[0082] In this embodiment, the recycled aggregate road repair asphalt patch material is laid to a thickness of 50mm and compacted 5 times. It is allowed to stand for 3.25 hours at an ambient temperature of 17.5℃ before being opened to traffic. After deducting the aqueous liquid phase component in the reactive recycled emulsion intermediate, the synthetic gradation of all mineral components in the recycled aggregate road repair asphalt patch material of this embodiment, based on the dry basis mass of the inorganic mineral components after deducting the water content in the reactive recycled emulsion, shows the following pass rates on various sieves: 13.2mm sieve 100wt%, 9.5mm sieve 85wt%, 4.75mm sieve 55wt%, 2.36mm sieve 25wt%, 1.18mm sieve 12.5wt%, 0.6mm sieve 8wt%, 0.3mm sieve 5.5wt%, 0.15mm sieve 3.5wt%, and 0.075mm sieve 2wt%. The pass rate decreases sequentially from the largest sieve to the smallest sieve. The recycled aggregate road repair asphalt patch material of this embodiment was tested according to the test procedure for asphalt and asphalt mixtures in highway engineering. The Marshall stability after 2 hours of molding was 11.5 kN, the Marshall stability after 24 hours of molding was 14 kN, and the freeze-thaw splitting strength ratio was 88.5%.

[0083] Example 2

[0084] This embodiment provides a recycled aggregate road repair asphalt patch material, which, by weight, includes the following components: 71 parts of interface densified recycled aggregate intermediate, 2.8 parts of reactive recycled micro powder intermediate, 11.2 parts of reactive recycled emulsion intermediate, 10 parts of basalt aggregate, and 3 parts of asphalt pavement milling material fines.

[0085] The interface-densified recycled aggregate intermediate of this embodiment is prepared through the following steps: Recycled concrete aggregate with a particle size of 2.36 mm to 13.2 mm is dried at 90°C for 4 hours until the free water content is 0.6 wt%, and taken as 100 parts by weight; 4.2 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 2.5 parts by weight of silica, 0.65 parts by weight of acetic acid aqueous solution with a mass fraction of 35 wt%, and 35 parts by weight of deionized water are mixed, and the pH of the system is adjusted to 4.3 by controlling the ratio of acetic acid aqueous solution to deionized water, and pre-treated at 25°C. Hydrolysis for 25 minutes yields a pre-hydrolyzed coating liquid. The pre-hydrolyzed coating liquid is applied dropwise to the surface of the recycled concrete aggregate and mixed in a drum mixer at 25°C for 20 minutes. After curing at 65°C for 3 hours, the water absorption rate of the resulting aggregate is 2.2 wt%. A shell containing Si-O-Ca bonds and Si-O-Si bonds is formed on the surface, with a shell thickness of 100 nm as determined by electron microscopy. The surface Si / Ca atomic ratio is 0.50 as determined by X-ray photoelectron spectroscopy, thus obtaining the interface-densified recycled aggregate intermediate of this embodiment.

[0086] The reactive regenerated micropowder intermediate of this embodiment is prepared by the following steps: Regenerated concrete mortar is crushed, ground, and classified to obtain 100 parts by weight of regenerated concrete mortar micropowder with a median particle size D50 of 8 μm; 1.2 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 0.35 parts by weight of an 8 wt% sodium hydroxide aqueous solution, and 15 parts by weight of deionized water are mixed, and the pH of the system is adjusted to 9.5 by controlling the ratio of sodium hydroxide aqueous solution to deionized water to obtain a modified solution; all of the above-mentioned regenerated concrete mortar micropowder is added to the modified solution and stirred at 35°C for 50 minutes; dried at 65°C for 5 hours, the moisture content after drying is 1.2 wt%, thus obtaining the reactive regenerated micropowder intermediate of this embodiment, whose surface contains silanol groups and epoxy groups, and whose median particle size D50 is 8 μm, determined by laser particle size distribution.

[0087] The reactive regenerated emulsion intermediate of this embodiment is prepared by the following steps: 100 parts by weight of No. 70 road petroleum asphalt is heated to 132°C to melt it, 13 parts by weight of epoxidized soybean oil with an epoxy value of 7.2 wt% is added, and the mixture is kept at 132°C and stirred for 25 minutes to obtain the oil phase; 1.7 parts by weight of hexadecyltrimethylammonium bromide, 0.8 parts by weight of acetic acid aqueous solution with a mass fraction of 40 wt% and 50 parts by weight of deionized water are mixed and stirred at 60°C for 18 minutes to obtain the aqueous phase; the oil phase is gradually added to the aqueous phase at a speed of 5500 r / min using a high-speed shearing device for shearing. Cut for 18 minutes to obtain a primary emulsion; add 17 parts by mass of acid-stable styrene-butadiene latex with a solid content of 52 wt% to the primary emulsion, stir at 55°C for 25 minutes, and adjust the pH to 2.5 dropwise with a 40 wt% aqueous acetic acid solution; filter through a 150 μm sieve to remove agglomerates with a particle size greater than 150 μm to obtain the reactive regenerated emulsion intermediate of this embodiment. This emulsion is a cationic emulsion, and the emulsion particle size is 1.5 μm as determined by laser particle size distribution. The residual binder has a mass fraction of 66 wt% as determined by evaporation residue method, and the residual binder contains epoxy groups.

[0088] The preparation method of recycled aggregate road repair asphalt repair material in this embodiment includes the following steps: 71 parts of the prepared interface-densified recycled aggregate intermediate; 2.8 parts of the prepared reactive recycled micro powder intermediate; 11.2 parts of the prepared reactive recycled emulsion intermediate; the interface-densified recycled aggregate intermediate, 10 parts of basalt aggregate, and 3 parts of asphalt pavement milling material fines are dry-mixed for 75 seconds in a disc mixer, and then the reactive recycled micro powder intermediate is added for a second dry-mixing for 45 seconds to obtain a solid mixture; the reactive recycled emulsion intermediate is added to the solid mixture and mixed at 38°C for 110 seconds, and then matured at 38°C for 25 minutes to obtain recycled aggregate road repair asphalt repair material; the recycled aggregate road repair asphalt repair material obtained after maturity is packaged at 28°C with a material moisture content of 4.5 wt% and sealed and stored at 25°C for 10 days.

[0089] In this embodiment, the recycled aggregate road repair asphalt patch material is paved to a thickness of 35mm and compacted in 3 passes. After standing for 2 hours at an ambient temperature of 25℃, traffic is allowed to resume. After deducting the aqueous liquid phase component in the reactive recycled emulsion intermediate, the synthetic gradation of all mineral components in the recycled aggregate road repair asphalt patch material of this embodiment, based on the dry basis mass of the inorganic mineral components after deducting the water content in the reactive recycled emulsion, shows the following pass rates on various sieves: 13.2mm sieve: 100wt%, 9.5mm sieve: 88wt%, 4.75mm sieve: 58wt%, 2.36mm sieve: 28wt%, 1.18mm sieve: 14wt%, 0.6mm sieve: 9.5wt%, 0.3mm sieve: 6.5wt%, 0.15mm sieve: 4.5wt%, and 0.075mm sieve: 2.8wt%. The pass rate decreases sequentially from the largest sieve to the smallest sieve. The recycled aggregate road repair asphalt patch material of this embodiment was tested according to the test procedure for asphalt and asphalt mixtures in highway engineering. The Marshall stability after 2 hours of molding was 13kN, the Marshall stability after 24 hours of molding was 16kN, and the freeze-thaw splitting strength ratio was 90%.

[0090] Example 3

[0091] This embodiment provides a recycled aggregate road repair asphalt patch material, which, by weight, includes the following components: 59 parts of interface densified recycled aggregate intermediate, 5.6 parts of reactive recycled micro powder intermediate, 7.8 parts of reactive recycled emulsion intermediate, 15 parts of natural limestone aggregate, and 7 parts of basalt aggregate.

[0092] The interface-densified recycled aggregate intermediate of this embodiment is prepared through the following steps: Recycled concrete aggregate with a particle size of 2.36 mm to 13.2 mm is dried at 110°C for 6.5 hours until the free water content is 0.3 wt%, and taken as 100 parts by weight; 1.8 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 0.8 parts by weight of silica, 0.25 parts by weight of acetic acid aqueous solution with a mass fraction of 15 wt%, and 25 parts by weight of deionized water are mixed, and the pH of the system is adjusted to 5.2 by controlling the ratio of acetic acid aqueous solution to deionized water, and then dried at 35°C. Pre-hydrolysis was performed for 35 minutes to obtain a pre-hydrolyzed coating liquid. The pre-hydrolyzed coating liquid was applied to the surface of the above-mentioned recycled concrete aggregate by spraying, and then rolled and mixed in a drum mixer at 35°C for 40 minutes. After curing at 55°C for 5 hours, the water absorption rate of the resulting aggregate was 2.8 wt%, and a shell containing Si-O-Ca bonds and Si-O-Si bonds was formed on the surface. The shell thickness was 35 nm, as determined by electron microscopy. The surface Si / Ca atomic ratio was 0.18, as determined by X-ray photoelectron spectroscopy. This yielded the interface-densified recycled aggregate intermediate of this embodiment.

[0093] The reactive regenerated micropowder intermediate of this embodiment is prepared by the following steps: Regenerated concrete mortar is crushed, ground, and classified to obtain 100 parts by weight of regenerated concrete mortar micropowder with a median particle size D50 of 22 μm; 2.6 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 0.85 parts by weight of a 15 wt% sodium hydroxide aqueous solution, and 27 parts by weight of deionized water are mixed, and the pH of the system is adjusted to 10.2 by controlling the ratio of sodium hydroxide aqueous solution to deionized water to obtain a modified solution; all of the above-mentioned regenerated concrete mortar micropowder is added to the modified solution and stirred at 48°C for 105 minutes; dried at 75°C for 7 hours, and the moisture content after drying is 0.5 wt%, thus obtaining the reactive regenerated micropowder intermediate of this embodiment, which contains silanol groups and epoxy groups on its surface, and has a median particle size D50 of 22 μm, determined by laser particle size distribution.

[0094] The reactive regenerated emulsion intermediate of this embodiment is prepared through the following steps: 100 parts by weight of No. 70 road petroleum asphalt is heated to 123°C to melt it; 6.5 parts by weight of epoxidized soybean oil with an epoxy value of 6.3 wt% is added, and the mixture is stirred at 123°C for 15 minutes to obtain the oil phase; 0.7 parts by weight of hexadecyltrimethylammonium bromide, 0.25 parts by weight of an aqueous solution of acetic acid with a mass fraction of 15 wt%, and 38 parts by weight of deionized water are mixed and stirred at 48°C for 12 minutes to obtain the aqueous phase; the oil phase is gradually added to the aqueous phase at a rotation speed of 3500 r / min using a high-speed shearing device. The mixture was sheared for 12 minutes to obtain a primary emulsion. Seven parts by weight of acid-stable styrene-butadiene latex with a solid content of 47 wt% were added to the primary emulsion. The mixture was stirred at 43°C for 15 minutes, and the pH was adjusted dropwise to 3.6 using a 15 wt% aqueous acetic acid solution. Aggregates with a particle size greater than 150 μm were removed by filtration through a 150 μm sieve to obtain the reactive regenerated emulsion intermediate of this embodiment. This emulsion is a cationic emulsion with a particle size of 4.2 μm determined by laser particle size distribution. The residual binder content was 57 wt% determined by evaporation residue method, and the residual binder contained epoxy groups.

[0095] The preparation method of recycled aggregate road repair asphalt repair material in this embodiment includes the following steps: 59 parts of the prepared interface-densified recycled aggregate intermediate; 5.6 parts of the prepared reactive recycled micro powder intermediate; 7.8 parts of the prepared reactive recycled emulsion intermediate; the interface-densified recycled aggregate intermediate, 15 parts of natural limestone aggregate, and 7 parts of basalt aggregate are dry-mixed for 110 seconds in a twin-shaft mixer, and then the reactive recycled micro powder intermediate is added for a second dry-mixing for 80 seconds to obtain a solid mixture; the reactive recycled emulsion intermediate is added to the solid mixture and mixed at 27°C for 165 seconds, and then matured at 27°C for 52 minutes to obtain recycled aggregate road repair asphalt repair material; the recycled aggregate road repair asphalt repair material obtained after maturity is packaged at 15°C with a material moisture content of 2.0 wt% at the time of packaging, and then sealed and stored at 12°C for 25 days.

[0096] In this embodiment, the recycled aggregate road repair asphalt patch material is laid to a thickness of 65mm and compacted 7 times. After standing for 5 hours at an ambient temperature of 8℃, traffic is allowed to resume. After deducting the aqueous liquid phase component in the reactive recycled emulsion intermediate, the synthetic gradation of all mineral components in the recycled aggregate road repair asphalt patch material of this embodiment, based on the dry basis mass of the inorganic mineral components after deducting the water content in the reactive recycled emulsion, shows the following pass rates on various sieves: 13.2mm sieve 100wt%, 9.5mm sieve 82wt%, 4.75mm sieve 52wt%, 2.36mm sieve 22wt%, 1.18mm sieve 11wt%, 0.6mm sieve 6.5wt%, 0.3mm sieve 4.2wt%, 0.15mm sieve 2.2wt%, and 0.075mm sieve 1.2wt%. The pass rate decreases sequentially from the largest sieve to the smallest sieve. The recycled aggregate road repair asphalt patch material of this embodiment was tested according to the test procedure for asphalt and asphalt mixtures in highway engineering. The Marshall stability after 2 hours of molding was 9 kN, the Marshall stability after 24 hours of molding was 11.5 kN, and the freeze-thaw splitting strength ratio was 84%.

[0097] Example 4

[0098] This embodiment provides a recycled aggregate road repair asphalt patch material, which, by weight, includes the following components: 56.5 parts of interface densified recycled aggregate intermediate, 5.7 parts of reactive recycled micro powder intermediate, 11.6 parts of reactive recycled emulsion intermediate, and 23.5 parts of basalt aggregate.

[0099] The interface-densified recycled aggregate intermediate of this embodiment is prepared by the following steps: Recycled concrete aggregate with a particle size of 2.36 mm to 13.2 mm is dried at 115°C for 7.5 hours until the free water content is 0.8 wt%, and taken as 100 parts by weight; 4.7 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 0.6 parts by weight of silica, 0.72 parts by weight of acetic acid aqueous solution with a mass fraction of 45 wt%, and 22 parts by weight of deionized water are mixed, and the pH of the system is adjusted to 4.2 by controlling the ratio of acetic acid aqueous solution to deionized water, and then dried at 22°C. Pre-hydrolysis for 37 minutes yields a pre-hydrolyzed coating liquid. The pre-hydrolyzed coating liquid is applied dropwise to the surface of the recycled concrete aggregate and mixed in a roller mixer at 38°C for 18 minutes. After curing at 68°C for 2.5 hours, the water absorption rate of the resulting aggregate is 2.1 wt%. A shell containing Si-O-Ca bonds and Si-O-Si bonds is formed on the surface, with a shell thickness of 110 nm as determined by electron microscopy. The surface Si / Ca atomic ratio is 0.56 as determined by X-ray photoelectron spectroscopy, yielding the interface-densified recycled aggregate intermediate of this embodiment.

[0100] The reactive regenerated micropowder intermediate of this embodiment is prepared by the following steps: Regenerated concrete mortar is crushed, ground, and classified to obtain 100 parts by weight of regenerated concrete mortar micropowder with a median particle size D50 of 6 μm; 2.9 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 0.15 parts by weight of a 18 wt% sodium hydroxide aqueous solution, and 12 parts by weight of deionized water are mixed, and the pH of the system is adjusted to 10.4 by controlling the ratio of sodium hydroxide aqueous solution to deionized water to obtain a modified solution; all of the above-mentioned regenerated concrete mortar micropowder is added to the modified solution and stirred at 32°C for 115 minutes; dried at 78°C for 4.3 hours, and the water content after drying is 1.8 wt%, thus obtaining the reactive regenerated micropowder intermediate of this embodiment, which contains silanol groups and epoxy groups on its surface, and has a median particle size D50 of 6 μm, determined by laser particle size distribution.

[0101] The reactive regenerated emulsion intermediate of this embodiment is prepared by the following steps: 100 parts by weight of No. 70 road petroleum asphalt is heated to 121°C to melt it, 5.5 parts by weight of epoxidized soybean oil with an epoxy value of 7.4 wt% is added, and the mixture is stirred at 121°C for 28 minutes to obtain the oil phase; 0.52 parts by weight of hexadecyltrimethylammonium bromide, 0.92 parts by weight of an aqueous solution of acetic acid with a mass fraction of 48 wt% and 52 parts by weight of deionized water are mixed and stirred at 47°C for 19 minutes to obtain the aqueous phase; the oil phase is gradually added to the aqueous phase at a rotation speed of 3200 r / min using a high-speed shearing device. Shearing for 19 minutes yielded a primary emulsion. 18.5 parts by weight of acid-stable styrene-butadiene latex with a solid content of 46 wt% were added to the primary emulsion, and the mixture was stirred at 42°C for 28 minutes. The pH was adjusted dropwise to 2.2 using a 48 wt% aqueous acetic acid solution. Aggregates larger than 150 μm were removed by filtration through a 150 μm sieve, yielding the reactive regenerated emulsion intermediate of this embodiment. This emulsion is a cationic emulsion, with a particle size of 0.8 μm determined by laser particle size analysis. The residual binder content was 68 wt% determined by evaporation residue analysis, and the residual binder contained epoxy groups.

[0102] The preparation method of recycled aggregate road repair asphalt repair material in this embodiment includes the following steps: 56.5 parts of the prepared interface-densified recycled aggregate intermediate; 5.7 parts of the prepared reactive recycled micro powder intermediate; 11.6 parts of the prepared reactive recycled emulsion intermediate; the interface-densified recycled aggregate intermediate and 23.5 parts of basalt aggregate are dry-mixed for the first time in a horizontal forced mixer for 67 seconds, and then the reactive recycled micro powder intermediate is added for the second dry-mixing for 84 seconds to obtain a solid mixture; the reactive recycled emulsion intermediate is added to the solid mixture and mixed at 23°C for 173 seconds, and then matured at 42°C for 18 minutes to obtain recycled aggregate road repair asphalt repair material; the recycled aggregate road repair asphalt repair material obtained after maturity is packaged at 33°C with a material moisture content of 5.7 wt% at the time of packaging, and then sealed and stored at 8°C for 28 days.

[0103] In this embodiment, the recycled aggregate road repair asphalt patch material is laid to a thickness of 25mm and compacted 7 times. After standing for 1 hour at an ambient temperature of 32℃, traffic is allowed to resume. After deducting the aqueous liquid phase component in the reactive recycled emulsion intermediate, the synthetic gradation of all mineral components in the recycled aggregate road repair asphalt patch material of this embodiment, measured by dry basis mass of inorganic mineral components after deducting the water content in the reactive recycled emulsion, shows the following pass rates on various sieves: 13.2mm sieve 100wt%, 9.5mm sieve 89wt%, 4.75mm sieve 59wt%, 2.36mm sieve 29wt%, 1.18mm sieve 14.5wt%, 0.6mm sieve 9.8wt%, 0.3mm sieve 6.8wt%, 0.15mm sieve 4.8wt%, and 0.075mm sieve 2.9wt%. The pass rate decreases sequentially from the largest sieve to the smallest sieve. The recycled aggregate road repair asphalt patch material of this embodiment was tested according to the test procedure for asphalt and asphalt mixtures in highway engineering. The Marshall stability after 2 hours of molding was 14.3 kN, the Marshall stability after 24 hours of molding was 17.2 kN, and the freeze-thaw splitting strength ratio was 93%.

[0104] Example 1 uses a medium parameter ratio, with balanced indicators, and is suitable for normal temperature repair of urban roads; Example 2 uses a high ratio of recycled aggregate and high emulsion to enhance early strength, and is suitable for rapid repair of high-grade highways; Example 3 uses a high ratio of micro powder and high natural aggregate to optimize low-temperature performance, and is suitable for thick-layer repair of rural roads; Example 4 uses a parameter combination close to the range boundary to achieve ultra-high early strength and durability, and is suitable for high-load scenarios such as airport pavements.

[0105] Comparative Example 1: Basically the same as Example 1, except that the amount of the interface densified recycled aggregate intermediate is 50 parts, and other conditions remain unchanged.

[0106] Comparative Example 2: It is basically the same as Example 1, except that the amount of reactive regenerated micro powder intermediate is 1.5 parts, and other conditions remain unchanged.

[0107] Comparative Example 3: It is basically the same as Example 1, except that the amount of reactive regenerated emulsion intermediate is 13.0 parts, and other conditions remain unchanged.

[0108] Comparative Example 4: Basically the same as Example 1, except that the shell thickness on the surface of the interface densified recycled aggregate intermediate is 15nm, and other conditions remain unchanged.

[0109] Comparative Example 5: It is basically the same as Example 1, except that the median particle size D50 of the reactive regenerated micro powder intermediate is 30 μm, and other conditions remain unchanged.

[0110] Comparative Example 6: Basically the same as Example 1, except that the particle size of the reactive regenerated emulsion intermediate is 6.0 μm, and other conditions remain unchanged.

[0111] Comparative Example 7: It is basically the same as Example 1, except that the curing time in step S5 is 5 minutes, and other conditions remain unchanged.

[0112] Comparative Example 8: It is basically the same as Example 1, except that the 4.75mm sieve aperture of the synthetic gradation of all mineral components has a passing rate of 65wt%, and other conditions remain unchanged.

[0113] Performance testing:

[0114] After molding, the specimens were left to stand for 2 hours. Then, after molding at 20±2℃, the Marshall stability was measured at a constant temperature of 60℃. There were 4 specimens in each group, and the loading rate was 50mm / min. The data were processed as mean ± standard deviation to evaluate the ultra-early bearing capacity after construction at room temperature. The results were used as the early strength evaluation index.

[0115] After molding, the specimens were left to stand for 24 hours. Then, after standing at 20±2℃, the stability test was carried out at a constant temperature of 60℃. There were 4 specimens in each group. The constant temperature was maintained for 30 minutes before the test. The data were processed as mean ± standard deviation and used in conjunction with the 2-hour results to analyze the strength development rate in order to evaluate the stable load-bearing capacity of the material after the initial structural rearrangement was completed.

[0116] Molded specimens were prepared according to standard procedures, vacuum saturated with water, and subjected to freeze-thaw cycles. The splitting strength was measured and the freeze-thaw splitting strength ratio was calculated. Four specimens were used in each group, with controls from the same batch. Data were processed as mean ± standard deviation and correlated with water absorption rate and Si / Ca atomic ratio to evaluate water damage and structural integrity after freeze-thaw cycles, reflecting the water damage resistance after interface densification, emulsion bonding and micro powder filling.

[0117] After the on-site simulated repair layer is completed and constructed in an environment of 0℃ to 35℃, the surface adhesion to wheels, edge loosening, light load traffic deformation and early stability threshold are tested every 0.5 hours. The time when the conditions are met for two consecutive times is recorded as the time when traffic is opened. The test paving thickness, number of compaction passes and ambient temperature are kept consistent. The data is processed as the average opening time ± standard deviation to determine the time when traffic is opened.

[0118] After being sealed and stored at 5℃, 20℃ and 35℃ for 5 days, 15 days and 30 days respectively, the loose repair material was opened, remixed and the agglomeration rate, segregation degree, remixing time and stability retention rate 2 hours after remixing were measured. Packaging moisture content, storage temperature and remixing energy consumption were the key parameters. The data were processed as mean ± standard deviation and a storage decay curve was established to evaluate storage stability and remixing workability.

[0119] The water absorption rate of the interface densified recycled aggregate intermediate was first measured according to the aggregate test procedure. Then, X-ray photoelectron spectroscopy was performed on the same batch of samples and the Si / Ca atomic ratio was calculated. Three specimens were used in each group. The data were processed as mean ± standard deviation and correlated with the freeze-thaw splitting strength ratio to verify the degree of interface densification and chemical coupling strength at the same time. The water absorption rate reflects the shell densification and pore sealing effect, and the Si / Ca atomic ratio reflects the degree of surface silicification layer construction.

[0120] The reactive regenerated micron powder intermediate was dry dispersed, and the reactive regenerated emulsion intermediate was wet dispersed after being diluted by a specified multiple. Each was tested three times to obtain the median particle size D50 of the micron powder and the D10, D50, D90, and volume distribution peaks of the emulsion particle size distribution. The data were output and overlaid to compare the particle size distribution to verify whether the micron powder filling scale and the emulsion dispersion scale fall within the cooperating working window, and to determine the basis of filling, encapsulation, and storage stability.

[0121] Figure 1 The images show the Si2p X-ray photoelectron spectra of the samples from Example 1 and Comparative Example 4. X-ray photoelectron spectroscopy was used to characterize the chemical state of silicon on the surface of the two samples. In Example 1, the Si-O-Si and Si-O-Ca correlation peaks were clearer and the signals were stronger, indicating that the surface silicon composition was richer and could better reflect the formation effect of the silicon-modified interface.

[0122] Figure 2 The images show the Ca2p X-ray photoelectron spectra of the samples from Example 1 and Comparative Example 4. X-ray photoelectron spectroscopy was used to characterize the chemical state of calcium on the surface of the two samples. The Ca2p peak shape of Example 1 was more regular and the interface-related shoulder peak was more obvious, indicating that the interaction between the calcium component and the silicon phase was more complete and the interface structure was more stable.

[0123] Figure 3 The images show the O1s X-ray photoelectron spectra of the samples from Example 1 and Comparative Example 4. X-ray photoelectron spectroscopy was used to analyze the bonding environment of oxygen elements on the surface of the two groups of samples. In Example 1, the distribution of lattice oxygen and Si-O related components is more reasonable, indicating that its surface oxygen bonding structure is more conducive to the formation of a stable inorganic interface layer.

[0124] Figure 4 The image shows the Si / Ca atomic ratio statistics for samples from Example 1 and Comparative Example 4. The Si / Ca atomic ratio was calculated based on the surface atomic percentage obtained from X-ray photoelectron spectroscopy. The Si / Ca atomic ratio of Example 1 was significantly higher than that of Comparative Example 4, indicating that its surface silicon component coverage was higher and the interface control was more complete.

[0125] Figure 5The figure shows the correlation between water absorption rate and freeze-thaw splitting strength ratio for samples of Example 1 and Comparative Example 4. The water stability of the two groups of samples was evaluated by water absorption rate test and freeze-thaw splitting strength ratio test, and the correlation was analyzed by linear fitting. The results show that a lower water absorption rate corresponds to a higher freeze-thaw splitting strength ratio, indicating that Example 1 has better compactness and resistance to water damage.

[0126] Figure 6 The particle size distribution diagrams of the micro powders in Example 1 and Comparative Example 5 are shown. Laser particle size analysis was used to characterize the particle size distribution of the two groups of micro powders. The distribution peak of Example 1 is closer to the fine particle region and the distribution is more concentrated, indicating that its micro powder gradation is more conducive to filling and uniform dispersion.

[0127] Figure 7 The cumulative particle size distribution diagrams of the micro powders in Example 1 and Comparative Example 5 are shown. Laser particle size analysis was used to statistically analyze the D10, D50, and D90 of the two groups of micro powders and their cumulative distribution characteristics. The characteristic particle size of Example 1 is smaller overall and the cumulative curve is shifted forward, indicating that its micro powder has a finer and more uniform particle size structure.

[0128] Figure 8 The particle size distribution diagrams of the emulsions in Example 1 and Comparative Example 6 are shown. Laser particle size analysis was used to characterize the particle size of the two groups of emulsions. The particle size distribution of Example 1 is more concentrated and the peak value is located in the smaller particle size range, indicating that its emulsion dispersion is more stable, which is beneficial to subsequent uniform coating.

[0129] Figure 9 The cumulative particle size distribution diagrams of the emulsions in Example 1 and Comparative Example 6 are shown. Laser particle size analysis was used to statistically analyze the D10, D50, and D90 values ​​and cumulative distribution characteristics of the two groups of emulsions. The cumulative curve of Example 1 shifted to the left as a whole and the characteristic particle size was smaller, indicating that its emulsion particles were finer, which is beneficial to improving dispersion uniformity and construction adaptability.

[0130] Figure 10 The graph shows the relationship between curing time and Marshall stability for samples of Example 1 and Comparative Example 7. The Marshall test was used to investigate the strength growth pattern of the two groups of samples under different curing times. Example 1 showed higher Marshall stability and faster growth at all ages, indicating that its early molding performance and later load-bearing capacity were better.

[0131] Figure 11 The graph shows the relationship between storage time, remixing time, and 2-hour stability retention rate for samples of Example 1 and Comparative Example 3. Storage stability test, remixing performance test, and Marshall stability retention rate test were used to evaluate the performance of the samples after storage. Example 1 showed lighter agglomeration, shorter remixing time, and higher 2-hour stability retention rate during storage, indicating better storage stability and reconstructive adaptability.

[0132] Figure 12This is a macroscopic photograph of the recycled aggregate road repair asphalt patch material prepared in Example 1. The sample is dark gray-black granular, with mineral aggregates uniformly distributed in the asphalt matrix. There is no obvious exposed aggregate or asphalt exudation on the surface, and the edge contours are clear without shrinkage cracks. The rough texture formed by the cement stone layer attached to the surface of the recycled concrete aggregate, combined with the intrinsic black color of the asphalt, presents a mixed gray-black hue, indicating that the reactive recycled emulsion has achieved good coating of the heterogeneous aggregate system. The surface wet gloss is moderate, consistent with the designed moisture content of 3.0 wt% and the curing process parameters, showing good overall volume stability and workability. This proves that the interface densification treatment and the reactive emulsion compound system can effectively coordinate the contradiction between the high porosity of recycled aggregates and the macroscopic uniformity of asphalt-based repair materials.

[0133] Figure 13 Scanning electron microscope (SEM) images of the recycled aggregate road repair asphalt patch material prepared in Example 1 show that the recycled aggregate is coated with a continuous asphalt emulsion composite binder phase. The old mortar layer attached to the surface of the recycled aggregate exhibits a porous and loose morphology, while the interface densified coating layer forms a smooth transition zone. Cross-sectional images show good continuity of the binder layer, and the asphalt three-phase interface of the aggregate shell layer shows good bonding without obvious delamination or peeling. This demonstrates that 3-glycidyl etheroxypropyltrimethoxysilane pretreatment can construct a dense shell layer containing silicon-oxygen-calcium bonds and silicon-oxygen-silicon bonds on the surface of the recycled aggregate. Combined with the cross-linking and curing effect of epoxy groups in the reactive emulsion, this significantly improves the interfacial compatibility and bond strength between the highly absorbent surface of the recycled aggregate and the asphalt matrix.

[0134] Table 1 Performance summary of examples and comparative examples

[0135]

[0136] As can be seen from the performance of the examples and comparative examples in Table 1, the examples are significantly better than the comparative examples with deviations from a single variable overall. Among them, Example 4 shows the best performance in 2-hour Marshall stability, 24-hour Marshall stability, freeze-thaw splitting strength ratio, and time to open traffic, indicating that high interfacial densification, finer powder, and smaller emulsion particle size can synergistically enhance early strength and water damage resistance at room temperature. Example 2 maintains a high level between early strength and durability, making it suitable for rapid repair of high-grade roads. Example 1 demonstrates a balanced advantage. Although Example 3 has slightly lower early strength, it has a longer storage stability period, making it suitable for low-temperature and thick-layer repair. Comparative Examples 4, 5, 6, and 7 demonstrate from the perspectives of shell thinning, powder coarsening, emulsion coarsening, and insufficient curing that interfacial chemical coupling, filling size control, emulsion dispersion stability, and sufficient curing jointly determine the final service performance of the material.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that any equivalent structural transformations made under the concept of the present invention and using the contents of the specification and drawings of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A recycled aggregate road repair asphalt patch material, characterized in that, Based on the mass fraction of the input material, it includes the following components: 55-75 parts of interfacial densified recycled aggregate intermediate; 2-6 parts of reactive regenerated micro powder intermediate; 7-12 parts of reactive regenerated emulsion intermediate; One or more of natural limestone aggregate, basalt aggregate and asphalt pavement milling material fines, with the total of the selected components being 10 to 25 parts; The interface-densified recycled aggregate intermediate is prepared from recycled concrete aggregate, 3-glycidyl etheroxypropyltrimethoxysilane, and silica, with a shell layer containing Si-O-Ca and Si-O-Si bonds on its surface. The shell layer has a thickness of 20 nm to 120 nm and a water absorption rate of 2.0 wt% to 3.0 wt%. The reactive recycled micro powder intermediate is prepared from recycled concrete adhering mortar micro powder, 3-glycidyl etheroxypropyltrimethoxysilane, and sodium hydroxide, with a median particle size D50 of 5 μm to 25 μm. The reactive recycled emulsion intermediate is prepared from road petroleum asphalt, epoxidized soybean oil, styrene-butadiene latex, cetyltrimethylammonium bromide, acetic acid, and deionized water, with an emulsion particle size of 0.5 μm to 5 μm and a residual binder mass fraction of 55 wt% to 70 wt%.

2. The recycled aggregate road repair asphalt patch material according to claim 1, characterized in that, The interface-densified recycled aggregate intermediate is prepared through the following steps: A1. Dry the recycled concrete aggregate until the free water content is no more than 1.0 wt%, and take it as 100 parts by weight; A2. Mix 1 to 5 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 0.5 to 3 parts by weight of silica, 0.1 to 0.8 parts by weight of aqueous acetic acid solution, and 20 to 40 parts by weight of deionized water, adjust the pH to 4.0 to 5.5, and pre-hydrolyze at 20°C to 40°C for 20 to 40 minutes to obtain a pre-hydrolyzed coating solution; A3. Apply the pre-hydrolyzed coating liquid to the surface of the recycled concrete aggregate obtained in step A1, and roll and mix at 20℃~40℃ for 15min~45min; A4. The aggregate is cured at 50℃~70℃ for 2h~6h. The water absorption rate of the aggregate after curing is 2.0wt%~3.0wt%, thus obtaining the interface densified recycled aggregate intermediate.

3. The recycled aggregate road repair asphalt patch material according to claim 1, characterized in that, The reactive regenerated micro powder intermediate is prepared through the following steps: B1. The recycled concrete mortar is crushed, ground and classified to obtain 100 parts by weight of recycled concrete mortar powder with a median particle size D50 of 5μm to 25μm. B2. Mix 0.5 to 3 parts by weight of 3-glycidyl etheroxypropyltrimethoxysilane, 0.1 to 1 part by weight of sodium hydroxide aqueous solution, and 10 to 30 parts by weight of deionized water, and adjust the pH to 9.0 to 10.5 to obtain the modified solution; B3. Add the recycled concrete adhering mortar micro powder obtained in step B1 to the modified liquid and stir at 30℃~50℃ for 30min~120min; B4. Dry at 60℃~80℃ for 4h~8h, and the moisture content after drying is not higher than 2.0wt% to obtain the reactive regenerated micro powder intermediate.

4. The recycled aggregate road repair asphalt patch material according to claim 1, characterized in that, The reactive regenerated emulsion intermediate is prepared through the following steps: C1. Heat 100 parts by weight of road petroleum asphalt to 120℃~135℃ to melt it, add 5 parts by weight to 15 parts by weight of epoxidized soybean oil, and keep stirring at 120℃~135℃ for 10min~30min to obtain the oil phase; C2. Mix 0.5 to 2 parts by mass of hexadecyltrimethylammonium bromide, 0.1 to 1 part by mass of aqueous acetic acid, and 35 to 55 parts by mass of deionized water, and stir at 45°C to 65°C for 10 to 20 minutes to obtain an aqueous phase; C3. At 3000 r / min to 6000 r / min, the oil phase obtained in step C1 is added to the aqueous phase obtained in step C2 and sheared for 10 min to 20 min to obtain a primary emulsion; C4. Add 5 to 20 parts by weight of styrene-butadiene latex to the primary emulsion, stir at 40°C to 60°C for 10 to 30 minutes, and adjust the pH to 2.0 to 4.0; C5. Filter to remove agglomerates with a particle size greater than 150 μm to obtain the reactive regenerated emulsion intermediate with an emulsion particle size of 0.5 μm to 5 μm and a residual binder mass fraction of 55 wt% to 70 wt%.

5. The recycled aggregate road repair asphalt patch material according to claim 1, characterized in that, The road petroleum asphalt is No. 70 road petroleum asphalt, the solid content of the styrene-butadiene latex is 45wt%–55wt%, the epoxy value of the epoxidized soybean oil is 6.0wt%–7.5wt%, and the Si / Ca atomic ratio on the surface of the interface densified recycled aggregate intermediate is 0.10–0.

60. After deducting the aqueous liquid phase component in the reactive recycled emulsion intermediate, the mass passing rates of all mineral components in the recycled aggregate road repair asphalt repair material are as follows: 100wt% through a 13.2mm sieve, 80wt%–90wt% through a 9.5mm sieve, and 50wt% through a 4.75mm sieve. The sieve apertures are: ~60wt%, 2.36mm sieve aperture 20wt%~30wt%, 1.18mm sieve aperture 10wt%~15wt%, 0.6mm sieve aperture 6wt%~10wt%, 0.3mm sieve aperture 4wt%~7wt%, 0.15mm sieve aperture 2wt%~5wt%, and 0.075mm sieve aperture 1wt%~3wt%, with the passing rate of each sieve aperture decreasing sequentially from the largest to the smallest. The Marshall stability of the recycled aggregate road repair asphalt patch material after molding is 8kN~15kN after 2 hours and 10kN~18kN after 24 hours, with a freeze-thaw splitting strength ratio of 82%~95%.

6. A method for preparing recycled aggregate road repair asphalt patch material as described in any one of claims 1-5, characterized in that, Based on the mass of the input materials, the following steps are included: S1. Take 55-75 parts of the prepared interfacial densified recycled aggregate intermediate; S2. Take 2-6 parts of the prepared reactive regenerated micro powder intermediate; S3. Take 7-12 parts of the prepared reactive regenerated emulsion intermediate; S4. The interface densified recycled aggregate intermediate taken in step S1 is mixed with one or more of natural limestone aggregate, basalt aggregate and asphalt pavement milling material fines, with the total selected components being 10 to 25 parts. The mixture is then dry-mixed for the first time, and the reactive recycled micro powder intermediate taken in step S2 is added for the second dry-mixing to obtain a solid mixture. S5. Add the reactive recycled emulsion intermediate obtained in step S3 to the solid mixture, mix at 20℃~45℃ for 90s~180s, and then mature at 20℃~45℃ for 15min~60min to obtain recycled aggregate road repair asphalt repair material.

7. The preparation method according to claim 6, characterized in that, The first dry mixing time in step S4 is 60s to 120s, and the second dry mixing time after adding the reactive regenerated micro powder intermediate taken in step S2 is 30s to 90s.

8. The preparation method according to claim 6, characterized in that, In step S5, the recycled aggregate road repair asphalt repair material obtained after maturation is packaged at 10℃~35℃, with the material moisture content not exceeding 6.0wt% during packaging, and then sealed and stored at 5℃~35℃ for 1d~30d.

9. The preparation method according to claim 6, characterized in that, Steps S4 and S5 are carried out in a horizontal forced mixer, a disc mixer or a twin-shaft mixer; the recycled aggregate road repair asphalt repair material obtained in step S5 has a paving thickness of 20mm to 80mm and a compaction number of 2 to 8 passes during construction.

10. The preparation method according to claim 9, characterized in that, The recycled aggregate road repair asphalt patch material obtained in step S5 is allowed to stand for 0.5h to 6h at an ambient temperature of 0℃ to 35℃ before being opened to traffic.

Images