Hydraulic high-performance asphalt concrete and preparation method thereof

Abstract

The invention provides hydraulic high-performance asphalt concrete and a preparation method thereof, and belongs to the technical field of hydraulic high-performance asphalt concrete. The hydraulic high-performance asphalt concrete is prepared from the following raw materials: 8 to 10 parts of SBS (Styrene Butadiene Styrene) composite modified asphalt, 28 to 32 parts of coarse aggregate, 18 to 24 parts of medium aggregate, 20 to 30 parts of fine aggregate, 6 to 10 parts of active filler, 2 to 4 parts of polypropylene fiber and 0.04 to 0.06 part of anti-stripping agent. Phase-change composite particles and zeolite are used as raw materials, the phase-change composite particles are soaked into pores of the porous zeolite under the vacuum condition to prepare a stable phase-change compound, a dynamic chemical system network is constructed on the surface of the stable phase-change compound, and graphene aerogel and montmorillonite are further adopted for functional reinforcement. The hydraulic high-performance asphalt concrete prepared on the basis of the active filler has good mechanical performance, anti-cracking performance and anti-seepage performance and can be widely applied to the field of hydraulic engineering.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic high-performance asphalt concrete, and in particular to hydraulic high-performance asphalt concrete and a preparation method thereof. Background Art

[0002] As a core anti-seepage material for water conservancy projects, high-performance hydraulic asphalt concrete's durability, impermeability, and crack resistance are directly related to project safety and service life. While traditional high-performance hydraulic asphalt concrete demonstrates good performance under conventional conditions, it still faces challenges such as material aging, low-temperature cracking, and interfacial adhesion failure under extreme climates (such as extreme cold and humidity), complex stresses, and long-term water erosion.

[0003] In recent years, existing technologies have modified asphalt by introducing polymers such as SBS (styrene-butadiene-styrene block copolymer) and rubber powder. Alternatively, organic modifiers have been added to the preparation of asphalt concrete to improve the viscoelastic properties of asphalt, enhancing its high-temperature deformation resistance and low-temperature toughness. However, the resulting modified asphalt concrete still suffers from chemical structural degradation due to long-term water-oxygen coupling, leading to cracking and reduced anti-seepage performance. Summary of the Invention

[0004] In view of the above deficiencies in the prior art, the present invention provides a hydraulic high-performance asphalt concrete and a preparation method thereof. The hydraulic high-performance asphalt concrete of the present invention has good mechanical strength, crack resistance and anti-seepage performance, and can be widely used in the field of water conservancy projects.

[0005] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0006] A hydraulic high-performance asphalt concrete, the raw materials of which include: 8-10 parts of SBS composite modified asphalt, 28-32 parts of coarse aggregate, 18-24 parts of medium aggregate, 20-30 parts of fine aggregate, 6-10 parts of active filler, 2-4 parts of polypropylene fiber, and 0.04-0.06 parts of anti-stripping agent;

[0007] The preparation method of the active filler is as follows:

[0008] (1) Phase change composite particles are prepared by hydrothermal reaction of phase change material (PCM) and TiO2 precursor;

[0009] (2) The phase change composite particles and zeolite are mixed uniformly under vacuum, and the phase change composite particles are impregnated into the pores of the zeolite to obtain a stable phase change composite;

[0010] (3) uniformly mixing the phase change composite with polyvinyl alcohol and performing annealing treatment to obtain a precursor;

[0011] (4) The precursor is mixed evenly with the lipoic acid-carbon nanotube complex (carbon nanotubes loaded with lipoic acid), and then graphene aerogel and montmorillonite are added and mixed evenly by high-speed stirring to obtain an active filler.

[0012] In response to the problem that high-performance hydraulic asphalt concrete in the prior art is prone to cracking and attenuation of its anti-seepage performance under long-term water-oxygen coupling, the present invention takes asphalt modification, active fillers, aggregate grading optimization, and fiber reinforcement as its starting points to prepare a high-performance hydraulic asphalt concrete with good mechanical strength, anti-cracking performance, and anti-seepage performance. In the active filler, the present invention uses phase-change composite particles and zeolite as raw materials. By impregnating the phase-change composite particles into the pores of porous zeolite under vacuum conditions, a stable phase-change composite is prepared. This is used as a carrier substrate to construct a dynamic chemical system network on its surface, and further functional enhancement is achieved using graphene aerogel and montmorillonite. The use of the active filler in high-performance hydraulic asphalt concrete can effectively improve the comprehensive performance of high-performance hydraulic asphalt concrete, enabling it to be widely used in the field of water conservancy projects. For example, when cracks appear, the polyvinyl alcohol in the dynamic chemical system network triggers reversible bonding in a humid environment, achieving self-repair of the cracks; the lipoic acid-carbon nanotube complex triggers a free radical exchange reaction under mechanical force, enhancing interfacial toughness. Graphene, as a conductive material, can be used to monitor strain changes. Montmorillonite, as a filler layer, can improve the low-temperature ductility of asphalt concrete and inhibit asphalt aging. In SBS composite modified asphalt, whisker materials and SBS form an interpenetrating network structure through a coupling agent, achieving a triple crack-proofing and waterproofing mechanism of "crack bridging, interface reinforcement, and pore filling." This inhibits crack propagation and reduces water penetration paths, breaking through the limitations of traditional modification that only improves performance. The fiber material is distributed in a three-dimensional, random pattern, promoting adhesion between the various components and further forming a multi-scale reinforcement network with the active filler and modified asphalt, promoting the overall performance of enhanced asphalt concrete.

[0013] Furthermore, the weight ratio of the phase change material to the TiO2 precursor is 1:(1-1.5).

[0014] Furthermore, the weight ratio of the phase change composite particles, zeolite, polyvinyl alcohol, lipoic acid-carbon tube complex, graphene aerogel and montmorillonite is 100: (50-70): (25-35): (8-12): (5-7): (3-5).

[0015] Furthermore, the phase change material includes but is not limited to at least one of paraffin, lauric acid, myristic acid, stearic acid, and palmitic acid.

[0016] Furthermore, the TiO2 precursor includes but is not limited to at least one of tetraethyl titanate, tetrabutyl titanate, isopropyl titanate, and titanium tetrachloride.

[0017] Furthermore, the temperature of the hydrothermal reaction is 60-100° C., and the time is 4-8 h.

[0018] Furthermore, the zeolite includes but is not limited to at least one of Na-type zeolite, H-type zeolite, X-type zeolite, Y-type zeolite, β-type zeolite and A-type zeolite.

[0019] Furthermore, when the phase-change composite particles and zeolite are mixed under vacuum, the vacuum degree is 0.03-0.08 MPa and the temperature is 30-50°C.

[0020] Furthermore, the annealing treatment temperature is 140-180°C.

[0021] Furthermore, the high-speed stirring has a rotation speed of 2000-4000 rpm and a time of 10-20 min.

[0022] Furthermore, the particle size of the montmorillonite is less than 0.1 mm.

[0023] Furthermore, the SBS composite modified asphalt is obtained by modifying asphalt with SBS and functionalized whisker materials, and the modification process includes the following steps:

[0024] Grafting a silane coupling agent on the surface of the whisker material to obtain a functionalized whisker material;

[0025] SBS particles and functionalized whisker materials are mixed uniformly at 180-200°C, allowing the whiskers to be evenly encapsulated within the SBS elastic phase. Asphalt is then added and mixed further to create an SBS composite-modified asphalt. The whiskers are directionally dispersed within the asphalt, forming a "nanospring" structure that inhibits crack propagation, fills micropores between aggregates, and further reduces water absorption.

[0026] Furthermore, the weight ratio of the asphalt, SBS particles and functionalized whisker material is 100: (4-6): (1-3).

[0027] Furthermore, the whisker material includes but is not limited to at least one of wollastonite whiskers, calcium silicate whiskers, and calcium carbonate whiskers.

[0028] Furthermore, the coarse aggregate is limestone with a particle size of 5 to 12 mm; the medium aggregate is basalt with a particle size of 2.5 to 6 mm; and the fine aggregate is limestone with a particle size less than 2.5 mm.

[0029] Furthermore, the polypropylene fiber has a length of 8-12 mm, a diameter of 15-20 μm, a breaking strength greater than 1500 MPa, and an elastic modulus greater than 50 GPa.

[0030] The present invention also provides a method for preparing the hydraulic high-performance asphalt concrete, comprising the following steps:

[0031] Coarse aggregate, medium aggregate, fine aggregate, active filler and polypropylene fiber are mixed evenly, and then SBS composite modified asphalt and anti-stripping agent are added. The mixture is mixed evenly at 160-180°C and left to stand and mature at 140-150°C for 1-2 hours to promote the reaction between asphalt and active filler to obtain hydraulic high-performance asphalt concrete.

[0032] Compared with the prior art, the present invention is beneficial in that:

[0033] 1. The present invention takes asphalt modification, active fillers, aggregate gradation optimization and fiber reinforcement into consideration to prepare hydraulic high-performance asphalt concrete with good mechanical strength, crack resistance and anti-seepage performance. Specifically, it is as follows:

[0034] (1) In asphalt modification, the whisker material and SBS form an interpenetrating network structure, realizing the triple anti-crack and waterproof mechanism of "crack bridging-interface reinforcement-pore filling", inhibiting crack propagation and reducing the water penetration path, breaking through the single performance improvement limitation of traditional modification;

[0035] (2) Among active fillers, a: Temperature adaptation: The phase change composite particles undergo volume changes in the range of -30~70℃, compensating for thermal expansion and contraction stress and inhibiting the initiation of microcracks; b: Dynamic repair: Polyvinyl alcohol triggers reversible bonding to achieve autonomous crack repair; Lipoic acid-carbon nanotube complex triggers free radical exchange reaction under the action of mechanical force to enhance interface toughness; c: Intelligent monitoring: The graphene network provides real-time feedback on resistance changes to accurately locate the leakage path.

[0036] (3) The fiber material is distributed in three-dimensional random directions, which can promote the bonding between the components and form a multi-scale reinforcement network with the active filler and modified asphalt, further enhancing the comprehensive performance of asphalt concrete.

[0037] 2. The hydraulic high-performance asphalt concrete of the present invention is suitable for harsh working conditions such as high dam core walls and pumped storage power station panels, and has good application prospects. DETAILED DESCRIPTION

[0038] The technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] The present invention provides a hydraulic high-performance asphalt concrete, the raw materials of which include: 8-10 parts of SBS composite modified asphalt, 28-32 parts of coarse aggregate, 18-24 parts of medium aggregate, 20-30 parts of fine aggregate, 6-10 parts of active filler, 2-4 parts of polypropylene fiber, and 0.04-0.06 parts of anti-stripping agent;

[0040] The preparation method of the active filler is as follows:

[0041] (1) Phase change composite particles are prepared by hydrothermal reaction of phase change material (PCM) and TiO2 precursor;

[0042] (2) The phase change composite particles and zeolite are mixed uniformly under vacuum, and the phase change composite particles are impregnated into the pores of the zeolite to obtain a stable phase change composite;

[0043] (3) uniformly mixing the phase change composite with polyvinyl alcohol and performing annealing treatment to obtain a precursor;

[0044] (4) The precursor is mixed evenly with the lipoic acid-carbon nanotube complex (carbon nanotubes loaded with lipoic acid), and then graphene aerogel and montmorillonite are added and mixed evenly by high-speed stirring to obtain an active filler.

[0045] In some examples, the weight ratio of the phase change material to the TiO2 precursor is 1:(1-1.5); the weight ratio of the phase change composite particles, zeolite, polyvinyl alcohol, lipoic acid-carbon tube complex, graphene aerogel and montmorillonite is 100:(50-70):(25-35):(8-12):(5-7):(3-5).

[0046] In some examples, the phase change material includes but is not limited to at least one of paraffin, lauric acid, myristic acid, stearic acid, and palmitic acid; the TiO2 precursor includes but is not limited to at least one of tetraethyl titanate, tetrabutyl titanate, isopropyl titanate, and titanium tetrachloride; the zeolite includes but is not limited to at least one of Na-type zeolite, H-type zeolite, X-type zeolite, Y-type zeolite, β-type zeolite, and A-type zeolite.

[0047] In some examples, the hydrothermal reaction temperature is 60-100° C., and the time is 4-8 h.

[0048] In some examples, the phase change composite particles and zeolite are mixed under vacuum at a vacuum degree of 0.03-0.08 MPa and a temperature of 30-50° C.

[0049] In some examples, the annealing temperature is 140-180°C.

[0050] In some examples, the high-speed stirring has a rotation speed of 2000-4000 rpm and a time of 10-20 min.

[0051] In the following specific examples, the SBS composite modified asphalt is obtained by modifying asphalt with SBS and a functionalized whisker material. The modification process includes the following steps: grafting a silane coupling agent onto the surface of the whisker material to produce the functionalized whisker material; uniformly mixing the SBS particles and the functionalized whisker material at 180-200°C to uniformly encapsulate the whisker material within the SBS elastic phase; then adding asphalt and continuing to mix to produce the SBS composite modified asphalt. The whisker material is directionally dispersed in the asphalt, forming a "nanospring" structure that inhibits crack propagation, fills micropores between aggregates, and further reduces water absorption.

[0052] In some examples, the weight ratio of the asphalt, SBS particles, and functionalized whisker material is 100:(4-6):(1-3).

[0053] In some examples, the whisker material includes, but is not limited to, at least one of wollastonite whiskers, calcium silicate whiskers, and calcium carbonate whiskers.

[0054] In the following specific embodiments, the anti-stripping agent is AR-68; the particle size of the montmorillonite is less than 0.1 mm; the coarse aggregate is limestone with a particle size of 5 to 12 mm; the medium aggregate is basalt with a particle size of 2.5 to 6 mm; the fine aggregate is limestone with a particle size of less than 2.5 mm; the polypropylene fiber has a length of 8 to 12 mm, a diameter of 15 to 20 μm, a breaking strength greater than 1500 MPa, and an elastic modulus greater than 50 GPa.

[0055] Example 1

[0056] A hydraulic high-performance asphalt concrete, the raw materials of which include: 9 parts of SBS composite modified asphalt, 30 parts of coarse aggregate, 22 parts of medium aggregate, 25 parts of fine aggregate, 8 parts of active filler, 3 parts of polypropylene fiber, and 0.05 parts of anti-stripping agent;

[0057] Wherein, the preparation method of the active filler is as follows:

[0058] (1) Paraffin wax and tetraethyl titanate were mixed in water at a weight ratio of 1:1.5 and reacted at 80 °C for 4 h to obtain phase change composite particles;

[0059] (2) The phase change composite particles and Na-type zeolite were immersed into the pores of the zeolite at 40 °C under a vacuum of 0.05 MPa to obtain a stable phase change composite;

[0060] (3) The phase change composite was mixed with polyvinyl alcohol (molecular weight 35,000) and annealed at 160 °C to obtain a precursor;

[0061] (4) The precursor was mixed evenly with a lipoic acid-carbon nanotube complex (carbon nanotubes loaded with lipoic acid, with a loading of 5%), and then graphene aerogel and montmorillonite were added. The mixture was stirred at 3500 rpm for 10 minutes to obtain an active filler. The weight ratio of the phase change composite particles, Na-type zeolite, polyvinyl alcohol, lipoic acid-carbon nanotube complex, graphene aerogel, and montmorillonite was 100:60:35:5:6:4.

[0062] The SBS composite modified asphalt is prepared as follows: Silane coupling agent KH-570 is grafted onto the surface of wollastonite whiskers (the weight ratio of wollastonite whiskers to KH-570 is 20:1) to obtain a functionalized whisker material; SBS particles and the functionalized whisker material are mixed uniformly at 180°C to uniformly encapsulate the whisker material in the SBS elastic phase; asphalt is then added and mixing continues at 180°C to obtain the SBS composite modified asphalt. The weight ratio of asphalt, SBS particles, and functionalized whisker material is 100:5:2.

[0063] The preparation method of the hydraulic high-performance asphalt concrete is as follows: coarse aggregate, medium aggregate, fine aggregate, active filler and polypropylene fiber are uniformly mixed, and then SBS composite modified asphalt and anti-stripping agent are added, and the mixture is uniformly mixed at 170°C, and the mixture is allowed to stand and mature at 150°C for 1 hour to promote the reaction between the asphalt and the active filler to obtain the hydraulic high-performance asphalt concrete.

[0064] Example 2

[0065] A hydraulic high-performance asphalt concrete, the raw materials of which include: 10 parts of SBS composite modified asphalt, 32 parts of coarse aggregate, 18 parts of medium aggregate, 20 parts of fine aggregate, 6 parts of active filler, 3 parts of polypropylene fiber, and 0.05 parts of anti-stripping agent;

[0066] Wherein, the preparation method of the active filler is as follows:

[0067] (1) Paraffin wax and tetraethyl titanate were mixed in water at a weight ratio of 1:1.5 and reacted at 80 °C for 4 h to obtain phase change composite particles;

[0068] (2) The phase change composite particles and Na-type zeolite were immersed into the pores of the zeolite at 40 °C under a vacuum of 0.05 MPa to obtain a stable phase change composite;

[0069] (3) The phase change composite was mixed with polyvinyl alcohol (molecular weight 35,000) and annealed at 160 °C to obtain a precursor;

[0070] (4) The precursor was mixed evenly with a lipoic acid-carbon nanotube complex (carbon nanotubes loaded with lipoic acid, with a loading of 5%), and then graphene aerogel and montmorillonite were added. The mixture was stirred at 3500 rpm for 10 min to obtain an active filler. The weight ratio of the phase change composite particles, Na-type zeolite, polyvinyl alcohol, lipoic acid-carbon nanotube complex, graphene aerogel, and montmorillonite was 100:50:25:15:6:4.

[0071] The SBS composite modified asphalt is prepared as follows: Silane coupling agent KH-570 is grafted onto the surface of wollastonite whiskers (the weight ratio of wollastonite whiskers to KH-570 is 20:1) to obtain a functionalized whisker material; SBS particles and the functionalized whisker material are mixed uniformly at 180°C to uniformly encapsulate the whisker material in the SBS elastic phase; asphalt is then added and mixing continues at 180°C to obtain the SBS composite modified asphalt. The weight ratio of asphalt, SBS particles, and functionalized whisker material is 100:5:2.

[0072] The preparation method of the hydraulic high-performance asphalt concrete is as follows: coarse aggregate, medium aggregate, fine aggregate, active filler and polypropylene fiber are uniformly mixed, and then SBS composite modified asphalt and anti-stripping agent are added, and the mixture is uniformly mixed at 170°C, and the mixture is allowed to stand and mature at 150°C for 1 hour to promote the reaction between the asphalt and the active filler to obtain the hydraulic high-performance asphalt concrete.

[0073] Example 3

[0074] A hydraulic high-performance asphalt concrete, the raw materials of which include: 8 parts of SBS composite modified asphalt, 28 parts of coarse aggregate, 24 parts of medium aggregate, 30 parts of fine aggregate, 10 parts of active filler, 3 parts of polypropylene fiber, and 0.05 parts of anti-stripping agent;

[0075] Wherein, the preparation method of the active filler is as follows:

[0076] (1) Paraffin wax and tetraethyl titanate were mixed in water at a weight ratio of 1:1.5 and reacted at 80 °C for 4 h to obtain phase change composite particles;

[0077] (2) The phase change composite particles and Na-type zeolite were immersed into the pores of the zeolite at 40 °C under a vacuum of 0.05 MPa to obtain a stable phase change composite;

[0078] (3) The phase change composite was mixed with polyvinyl alcohol (molecular weight 35,000) and annealed at 160 °C to obtain a precursor;

[0079] (4) The precursor was mixed evenly with a lipoic acid-carbon nanotube complex (carbon nanotubes loaded with lipoic acid, with a loading of 5%), and then graphene aerogel and montmorillonite were added. The mixture was stirred at 3500 rpm for 10 min to obtain an active filler. The weight ratio of the phase change composite particles, Na-type zeolite, polyvinyl alcohol, lipoic acid-carbon nanotube complex, graphene aerogel, and montmorillonite was 100:70:35:10:6:4.

[0080] The SBS composite modified asphalt is prepared as follows: Silane coupling agent KH-570 is grafted onto the surface of wollastonite whiskers (the weight ratio of wollastonite whiskers to KH-570 is 20:1) to obtain a functionalized whisker material; SBS particles and the functionalized whisker material are mixed uniformly at 180°C to uniformly encapsulate the whisker material in the SBS elastic phase; asphalt is then added and mixing continues at 180°C to obtain the SBS composite modified asphalt. The weight ratio of asphalt, SBS particles, and functionalized whisker material is 100:5:2.

[0081] The preparation method of the hydraulic high-performance asphalt concrete is as follows: coarse aggregate, medium aggregate, fine aggregate, active filler and polypropylene fiber are uniformly mixed, and then SBS composite modified asphalt and anti-stripping agent are added, and the mixture is uniformly mixed at 170°C, and the mixture is allowed to stand and mature at 150°C for 1 hour to promote the reaction between the asphalt and the active filler to obtain the hydraulic high-performance asphalt concrete.

[0082] Comparative Example 1

[0083] A hydraulic high-performance asphalt concrete, the raw materials of which include: 9 parts of SBS composite modified asphalt, 30 parts of coarse aggregate, 22 parts of medium aggregate, 25 parts of fine aggregate, 8 parts of ordinary filler (limestone powder), 3 parts of polypropylene fiber, and 0.05 parts of anti-stripping agent;

[0084] The SBS composite modified asphalt is prepared as follows: Silane coupling agent KH-570 is grafted onto the surface of wollastonite whiskers (the weight ratio of wollastonite whiskers to KH-570 is 20:1) to obtain a functionalized whisker material; SBS particles and the functionalized whisker material are mixed uniformly at 180°C to uniformly encapsulate the whisker material in the SBS elastic phase; asphalt is then added and mixing continues at 180°C to obtain the SBS composite modified asphalt. The weight ratio of asphalt, SBS particles, and functionalized whisker material is 100:5:2.

[0085] The preparation method of the hydraulic high-performance asphalt concrete is as follows: coarse aggregate, medium aggregate, fine aggregate, ordinary filler and polypropylene fiber are uniformly mixed, and then SBS composite modified asphalt and anti-stripping agent are added, and the mixture is uniformly mixed at 170°C, and the mixture is allowed to stand and mature at 150°C for 1 hour to promote the reaction between the asphalt and the active filler to obtain the hydraulic high-performance asphalt concrete.

[0086] Comparative Example 2

[0087] A hydraulic high-performance asphalt concrete, the raw materials of which include: 9 parts of SBS composite modified asphalt, 30 parts of coarse aggregate, 22 parts of medium aggregate, 25 parts of fine aggregate, 8 parts of active filler, 3 parts of polypropylene fiber, and 0.05 parts of anti-stripping agent;

[0088] Wherein, the preparation method of the active filler is as follows:

[0089] (1) Paraffin wax and tetraethyl titanate were mixed in water at a weight ratio of 1:1.5 and reacted at 80 °C for 4 h to obtain phase change composite particles;

[0090] (2) The phase change composite particles and Na-type zeolite were immersed into the pores of the zeolite at 40 °C under a vacuum of 0.05 MPa to obtain a stable phase change composite;

[0091] (3) The phase change composite and lipoic acid-carbon nanotube composite (lipoic acid-loaded carbon nanotubes, with a loading of 5%) were uniformly mixed, and then graphene aerogel and montmorillonite were added. The mixture was stirred at 3500 rpm for 10 minutes to obtain an active filler. The weight ratio of the phase change composite particles, Na-type zeolite, lipoic acid-carbon nanotube composite, graphene aerogel, and montmorillonite was 100:60:5:6:4.

[0092] The SBS composite modified asphalt is prepared as follows: Silane coupling agent KH-570 is grafted onto the surface of wollastonite whiskers (the weight ratio of wollastonite whiskers to KH-570 is 20:1) to obtain a functionalized whisker material; SBS particles and the functionalized whisker material are mixed uniformly at 180°C to uniformly encapsulate the whisker material in the SBS elastic phase; asphalt is then added and mixing continues at 180°C to obtain the SBS composite modified asphalt. The weight ratio of asphalt, SBS particles, and functionalized whisker material is 100:5:2.

[0093] The preparation method of the hydraulic high-performance asphalt concrete is as follows: coarse aggregate, medium aggregate, fine aggregate, active filler and polypropylene fiber are uniformly mixed, and then SBS composite modified asphalt and anti-stripping agent are added, and the mixture is uniformly mixed at 170°C, and the mixture is allowed to stand and mature at 150°C for 1 hour to promote the reaction between the asphalt and the active filler to obtain the hydraulic high-performance asphalt concrete.

[0094] Comparative Example 3

[0095] A hydraulic high-performance asphalt concrete, the raw materials of which include: 9 parts of SBS composite modified asphalt, 30 parts of coarse aggregate, 22 parts of medium aggregate, 25 parts of fine aggregate, 8 parts of active filler, 3 parts of polypropylene fiber, and 0.05 parts of anti-stripping agent;

[0096] Wherein, the preparation method of the active filler is as follows:

[0097] (1) Paraffin wax and tetraethyl titanate were mixed in water at a weight ratio of 1:1.5 and reacted at 80 °C for 4 h to obtain phase change composite particles;

[0098] (2) The phase change composite particles and Na-type zeolite were immersed into the pores of the zeolite at 40 °C under a vacuum of 0.05 MPa to obtain a stable phase change composite;

[0099] (3) The phase change composite was mixed with polyvinyl alcohol (molecular weight 35,000) and annealed at 160 °C to obtain a precursor;

[0100] (4) The precursor, graphene aerogel, and montmorillonite were stirred at high speed at 3500 rpm for 10 min to obtain an active filler. The weight ratio of the phase change composite particles, Na-type zeolite, polyvinyl alcohol, graphene aerogel, and montmorillonite was 100:60:35:6:4.

[0101] The SBS composite modified asphalt is prepared as follows: Silane coupling agent KH-570 is grafted onto the surface of wollastonite whiskers (the weight ratio of wollastonite whiskers to KH-570 is 20:1) to obtain a functionalized whisker material; SBS particles and the functionalized whisker material are mixed uniformly at 180°C to uniformly encapsulate the whisker material in the SBS elastic phase; asphalt is then added and mixing continues at 180°C to obtain the SBS composite modified asphalt. The weight ratio of asphalt, SBS particles, and functionalized whisker material is 100:5:2.

[0102] The preparation method of the hydraulic high-performance asphalt concrete is as follows: coarse aggregate, medium aggregate, fine aggregate, active filler and polypropylene fiber are uniformly mixed, and then SBS composite modified asphalt and anti-stripping agent are added, and the mixture is uniformly mixed at 170°C, and the mixture is allowed to stand and mature at 150°C for 1 hour to promote the reaction between the asphalt and the active filler to obtain the hydraulic high-performance asphalt concrete.

[0103] The porosity and water stability of the hydraulic high performance asphalt concrete of Examples 1 to 3 and Comparative Examples 1 to 3 were tested. The test results are shown in Table 1.

[0104] The hydraulic high-performance asphalt concrete specimens were immersed in a constant temperature water tank at 80±1℃ for 750 h, then kept in a constant temperature water tank at 4.8℃ for 2 h, and then subjected to a splitting test to measure their splitting tensile strength. The test results are shown in Table 1.

[0105] The hydraulic high-performance asphalt concrete specimens were kept at a vacuum of 97.3–98.7 kPa for 15 min, returned to normal pressure, and placed in water for 0.5 h. The specimens were then placed in a concrete frost resistance testing machine and frozen and thawed 30 times, with the freezing temperature at -16 ± 2 °C and the melting temperature at 10 ± 2 °C. The specimens were immersed in a constant temperature water bath at 4.8 °C for no less than 24 h, and then a splitting test was performed to determine their splitting tensile strength. The test results are shown in Table 1.

[0106] Table 1: Performance test results of hydraulic high performance asphalt concrete of Examples 1 to 3 and Comparative Examples 1 to 3

[0107]

[0108] As shown in Table 1, the high-performance hydraulic asphalt concrete prepared by the present invention, which utilizes asphalt modification, active fillers, aggregate gradation optimization, and fiber reinforcement, exhibits excellent mechanical strength, crack resistance, and anti-seepage properties. Specifically, the high-performance hydraulic asphalt concrete exhibits excellent mechanical strength, crack resistance, and anti-seepage properties, as demonstrated by a porosity of less than 0.4%, a water stability coefficient greater than 0.9, a water-immersion splitting tensile strength greater than 3 MPa, and a splitting tensile strength greater than 4 MPa after 30 freeze-thaw cycles. These results demonstrate that the high-performance hydraulic asphalt concrete of the present invention is suitable for use in demanding applications such as high dam core walls and pumped-storage power station panels.

[0109] The above specific embodiments describe the implementation of the present invention in detail, but the present invention is not limited to the specific details of the above embodiments. Within the scope of the claims and technical concept of the present invention, various simple modifications and changes can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

Claims

1. A hydraulic high-performance asphalt concrete, characterized in that: Its raw materials include: 8-10 parts of SBS composite modified asphalt, 28-32 parts of coarse aggregate, 18-24 parts of medium aggregate, 20-30 parts of fine aggregate, 6-10 parts of active filler, 2-4 parts of polypropylene fiber, and 0.04-0.06 parts of anti-stripping agent; The preparation method of the active filler is as follows: (1) Phase change composite particles are prepared by hydrothermal reaction of phase change material and TiO2 precursor; (2) The phase change composite particles and zeolite are mixed uniformly under vacuum, and the phase change composite particles are impregnated into the pores of the zeolite to obtain a stable phase change composite; (3) uniformly mixing the phase change composite with polyvinyl alcohol and performing annealing treatment to obtain a precursor; (4) The precursor and the thioctic acid-carbon nanotube complex are mixed evenly, and then graphene aerogel and montmorillonite are added and mixed evenly by high-speed stirring to obtain an active filler.

2. The hydraulic high-performance asphalt concrete according to claim 1, characterized in that: The SBS composite modified asphalt is obtained by modifying asphalt with SBS and functionalized whisker materials.

3. The hydraulic high-performance asphalt concrete according to claim 2, characterized in that: The modification process comprises the following steps: Grafting a silane coupling agent on the surface of the whisker material to obtain a functionalized whisker material; The SBS particles and the functionalized whisker material were mixed uniformly at 180-200 °C, and then asphalt was added and continued to be mixed uniformly to obtain SBS composite modified asphalt.

4. The hydraulic high-performance asphalt concrete according to claim 3, characterized in that: The weight ratio of the asphalt, SBS particles and functionalized whisker material is 100: (4-6): (1-3).

5. The hydraulic high-performance asphalt concrete according to claim 1, characterized in that: The weight ratio of the phase change composite particles, zeolite, polyvinyl alcohol, lipoic acid-carbon tube complex, graphene aerogel and montmorillonite is 100: (50-70): (25-35): (8-12): (5-7): (3-5).

6. The hydraulic high-performance asphalt concrete according to claim 1, characterized in that: The phase change material includes but is not limited to at least one of paraffin, lauric acid, myristic acid, stearic acid, and palmitic acid; the TiO2 precursor includes but is not limited to at least one of tetraethyl titanate, tetrabutyl titanate, isopropyl titanate, and titanium tetrachloride; the zeolite includes but is not limited to at least one of Na-type zeolite, H-type zeolite, X-type zeolite, Y-type zeolite, β-type zeolite, and A-type zeolite.

7. The hydraulic high-performance asphalt concrete according to claim 1, characterized in that: The temperature of the hydrothermal reaction is 60-100°C and the time is 4-8 hours.

8. The hydraulic high-performance asphalt concrete according to claim 1, characterized in that: When the phase-change composite particles and zeolite are mixed under vacuum, the vacuum degree is 0.03-0.08 MPa and the temperature is 30-50°C.

9. The hydraulic high-performance asphalt concrete according to claim 1, characterized in that: The annealing temperature is 140-180°C.

10. The method for preparing the hydraulic high-performance asphalt concrete according to any one of claims 1 to 9, characterized in that: The following steps are involved: Coarse aggregate, medium aggregate, fine aggregate, active filler and polypropylene fiber are mixed evenly, and then SBS composite modified asphalt and anti-stripping agent are added. The mixture is mixed evenly at 160-180°C and left to stand and mature at 140-150°C for 1-2 hours to obtain hydraulic high-performance asphalt concrete.

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