A reactive, room-temperature permeable asphalt mixture and its preparation method

Abstract

This invention discloses a reactive, room-temperature permeable asphalt mixture, comprising aggregates, a curing agent, and reactive, room-temperature high-viscosity modified asphalt. The mass ratio of aggregates, curing agent, and reactive, room-temperature high-viscosity modified asphalt is 92-98:1-6:2-7. In this invention, the reactive diluent reacts with the hydration products in the curing agent through a saponification reaction, forming a bridge-like connection that increases the strength of the asphalt mixture, achieving curing. Under the action of crosslinking agents and tackifiers, the coating ability of the asphalt and aggregates is further improved, thereby enhancing the durability of the mixture. Compared with room-temperature asphalt mixtures based on petroleum solvents and emulsified asphalt, this mixture exhibits faster chemical reactions, higher early-stage strength, and better durability. The reactive, room-temperature permeable asphalt mixture obtained by the method of this invention has an initial stability of over 10 kN, a dynamic stability of over 2930 cycles / mm, and high-temperature stability that meets the requirements of OGFC hot-mix asphalt.

Description

Technical Field

[0001] This invention relates to the field of building materials, and in particular to a reactive, room-temperature permeable asphalt mixture and its testing method. Background Technology

[0002] Permeable asphalt concrete pavement, as an environmentally friendly pavement, possesses excellent road performance characteristics such as safety, noise reduction, and high-temperature stability. Furthermore, its high porosity effectively mitigates the rate of road surface heating in summer, thus reducing the urban heat island effect. Due to its large porosity, high-viscosity modified asphalt is generally chosen as the asphalt binder. Currently, most research on permeable asphalt mixtures uses hot-mix asphalt mixtures. The high temperatures not only easily cause asphalt aging but also require the construction of mixing plants, heating, and insulation, making construction complex, costly, and causing significant environmental pollution.

[0003] Normal-temperature asphalt mixtures align well with the green development concept due to their energy-saving, low-carbon, and environmentally friendly properties. Currently, commonly used normal-temperature asphalt mixtures mainly include petroleum-based and emulsified asphalt. The former primarily uses volatile petroleum and diesel oil as main materials, gradually increasing the strength of the mixture through the evaporation of petroleum solvents. However, this strength gain is slow, resulting in unstable road performance and poor durability. The latter mainly uses water as a medium, forming a certain strength after demulsification. However, this strength gain is slow, with low initial strength, and the residue of emulsifiers can also affect the adhesion between asphalt and aggregates. Therefore, both petroleum-based and emulsified asphalt suffer from low early strength and poor durability. Furthermore, the evaporation and demulsification of petroleum solvents are greatly affected by temperature and humidity, easily leaving residues that affect the viscosity of the asphalt, making it unsuitable for the high-viscosity modified asphalt performance requirements of permeable asphalt mixtures.

[0004] Therefore, a reactive, room-temperature permeable asphalt mixture is needed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A reactive, room-temperature permeable asphalt mixture includes aggregates, a curing agent, and reactive, room-temperature high-viscosity modified asphalt; the mass ratio of aggregates, curing agent, and reactive, room-temperature high-viscosity modified asphalt is 92–98:1–6:2–7.

[0007] The reactive high-viscosity modified asphalt at room temperature comprises the following components by mass fraction: 20-80 parts asphalt, 20-60 parts reactive diluent, 3-15 parts tackifier, and 1-5 parts crosslinking agent;

[0008] The asphalt is one or two of the following: base asphalt, SBS modified asphalt, and polyurethane modified asphalt.

[0009] The tackifier includes one or more of petroleum resin, epoxy resin, and acrylic resin mixed with hydroxyl-terminated polybutadiene or oleic acid-based hydroxyethyl imidazoline.

[0010] The crosslinking agent is at least one of hydroxyl-terminated polybutadiene or oleic acid-based hydroxyethyl imidazoline.

[0011] Preferably, the reactive diluent is an unsaturated fatty acid; the unsaturated fatty acid includes one or more of linoleic acid, linolenic acid, arachidonic acid, peanut oil, coconut oil, and corn oil. There are no requirements for the ratio between different types of unsaturated fatty acids.

[0012] Preferably, the curing agent is one or two types of metakaolin or kaolin mixed with one or more types of ordinary silicate cement, silicate cement, or sulfoaluminate cement in a 4:1 ratio.

[0013] Preferably, the curing agent is one or two types of metakaolin or kaolin mixed with one or more types of ordinary silicate cement, silicate cement, or sulfoaluminate cement in a ratio of 3.5:1.5.

[0014] Preferably, the mineral material is at least one of granite, diabase, and basalt;

[0015] Preferably, the gradation of the mineral is OGFC-10, OGFC-13 or LA-13.

[0016] Preferably, based on the mass fraction of the asphalt, the reactive room temperature high viscosity modified asphalt includes 3 to 15 parts or 5 to 10 parts of tackifier.

[0017] Preferably, based on the mass fraction of the asphalt, the crosslinking agent is 1 to 5 parts or 2 to 5 parts.

[0018] Preferably, the reactive, room-temperature permeable asphalt mixture has an open gradation.

[0019] Preferably, the ore is at least one of granite, diabase, and basalt, or diabase and basalt. The ore gradation is OGFC-10, OGFC-13, or LA-13.

[0020] A method for preparing a reactive, room-temperature permeable asphalt mixture includes the following steps:

[0021] (1) Heat the asphalt at 160℃ for 1.5-2.5 hours and keep it warm for later use;

[0022] (2) Reacting the reactive diluent, thickener, and solvent;

[0023] (3) Add the reactive solvent to the asphalt, stir at 100 r / min for 15 min, then stir at 300 r / min for 10 min until the reactive solvent is fully dispersed in the asphalt. During the stirring process, control the temperature of the asphalt to not exceed 150℃. Place the obtained reactive asphalt suspension in an 80℃ oven and let it mature for 30 min before use.

[0024] (4) Add the crosslinking agent to the asphalt suspension and stir at 100 r / min for 10 min until fully dispersed. During the stirring process, control the temperature of the asphalt to not exceed 60℃ to obtain reactive room temperature high viscosity modified asphalt.

[0025] (5) After the aggregate is mixed evenly, add reactive high-viscosity modified asphalt, stir twice, add curing agent, stir evenly again, and obtain reactive room temperature permeable asphalt mixture.

[0026] Furthermore, after adding the curing agent in step (5), the curing reaction time is 2 to 5 hours.

[0027] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows:

[0028] In this invention, the reactive diluent in the reactive room-temperature high-viscosity modified asphalt undergoes a saponification reaction with the hydration products in the curing agent, forming a bridge-like connection that increases the strength of the asphalt mixture and achieves curing. Under the action of the crosslinking agent and tackifier, the coating ability of the asphalt and aggregate is further improved, thereby enhancing the durability of the mixture. Compared with room-temperature asphalt mixtures based on petroleum solvents and emulsified asphalt, its chemical reaction is faster, resulting in higher early-stage strength and better durability. The reactive room-temperature permeable asphalt mixture obtained by the method of this invention has an initial stability of over 10 kN, a dynamic stability of over 2930 cycles / mm, and high-temperature stability that meets the requirements of OGFC hot-mix asphalt.

Detailed Implementation Methods

[0029] The following embodiments can help those skilled in the art to more fully understand the present invention, but should not be construed as limiting the present invention in any way.

[0030] A reactive, room-temperature permeable asphalt mixture includes aggregates, a curing agent, and reactive, room-temperature high-viscosity modified asphalt; the mass ratio of aggregates, curing agent, and reactive, room-temperature high-viscosity modified asphalt is 92–98:1–6:2–7.

[0031] The reactive high-viscosity modified asphalt at room temperature comprises the following components by mass fraction: 20-80 parts asphalt, 20-60 parts reactive diluent, 3-15 parts tackifier, and 1-5 parts crosslinking agent;

[0032] The asphalt is one or two of the following: base asphalt, SBS modified asphalt, and polyurethane modified asphalt.

[0033] The tackifier includes one or more of petroleum resin, epoxy resin, and acrylic resin mixed with hydroxyl-terminated polybutadiene or oleic acid-based hydroxyethyl imidazoline.

[0034] The crosslinking agent is at least one of hydroxyl-terminated polybutadiene or oleic acid-based hydroxyethyl imidazoline.

[0035] Preferably, the reactive diluent is an unsaturated fatty acid; the unsaturated fatty acid includes one or more of linoleic acid, linolenic acid, arachidonic acid, peanut oil, coconut oil, and corn oil.

[0036] Preferably, the unsaturated fatty acids include one or more of linoleic acid, linolenic acid, or corn oil, and there are no requirements for the ratio between different types of unsaturated fatty acids.

[0037] Preferably, the curing agent is one or two types of metakaolin or kaolin mixed with one or more types of ordinary silicate cement, silicate cement, or sulfoaluminate cement in a 4:1 ratio.

[0038] Preferably, the curing agent is one or two types of metakaolin or kaolin mixed with one or more types of ordinary silicate cement, silicate cement, or sulfoaluminate cement in a ratio of 3.5:1.5.

[0039] Furthermore, the mineral material is at least one of granite, diabase, and basalt;

[0040] Furthermore, the gradation of the mineral material is OGFC-10, OGFC-13, or LA-13.

[0041] Furthermore, based on the mass fraction of the asphalt, the reactive room-temperature high-viscosity modified asphalt includes 3-15 parts or 5-10 parts of a tackifier. The tackifier, after being mixed with the reactive diluent, is used to better improve the fluidity of the asphalt while simultaneously increasing its viscosity. The tackifier in this invention is relatively easy to mix with asphalt and crosslinking agents to form a network structure, thereby improving the low-temperature performance of the asphalt.

[0042] Furthermore, based on the mass fraction of the asphalt, the crosslinking agent is 1 to 5 parts or 2 to 5 parts. In this invention, the crosslinking agent enhances the low-temperature toughness of the asphalt and strengthens the coating ability between the asphalt and aggregates.

[0043] Furthermore, the reactive, room-temperature permeable asphalt mixture has an open gradation, and the aggregate gradation is also open.

[0044] The reactive, room-temperature, high-viscosity modified asphalt of this invention has a sealed storage time of 4 months.

[0045] Furthermore, the ore is at least one of granite, diabase, and basalt, or diabase and basalt. The ore gradation is OGFC-10, OGFC-13, or LA-13.

[0046]

[0047] Table 1 shows the aggregate gradation in reactive, room-temperature permeable asphalt mixtures.

[0048] The mass ratio of the mineral aggregate to the reactive room-temperature high-viscosity modified asphalt of this invention is (92-98):(2-7) or (91.5-97.5):(2.5-6.8).

[0049] In this invention, the curing agent is one or two types of metakaolin or kaolin, mixed with one or more types of ordinary silicate cement, silicate cement, or sulfoaluminate cement in a ratio of 4:1 or 3.5:1.5. The reactive diluent in this invention undergoes a saponification reaction with the hydration products in the curing agent, forming a bridge-like connection that increases the strength of the asphalt mixture. Simultaneously, the hydration reaction releases heat, accelerating the reaction rate. Furthermore, the network structure formed by the crosslinking agent and tackifier improves the coating ability of the asphalt and aggregates, significantly enhancing the durability of the asphalt mixture.

[0050] A method for preparing a reactive, room-temperature permeable asphalt mixture includes the following steps:

[0051] (1) Heat the asphalt at 160℃ for 1.5-2.5 hours and keep it warm for later use;

[0052] (2) The reactive diluent and thickener are mixed to obtain a reactive solvent;

[0053] (3) Add the reactive solvent to the asphalt, stir at 100 r / min for 15 min, then stir at 300 r / min for 10 min until the reactive solvent is fully dispersed in the asphalt. During the stirring process, control the temperature of the asphalt to not exceed 150℃. Place the obtained reactive asphalt suspension in an 80℃ oven and let it mature for 30 min before use.

[0054] (4) Add the crosslinking agent to the asphalt suspension and stir at 100 r / min for 10 min until fully dispersed. During the stirring process, control the temperature of the asphalt to not exceed 60℃ to obtain reactive room temperature high viscosity modified asphalt.

[0055] (5) After the aggregate is mixed evenly, add reactive high-viscosity modified asphalt, stir twice, add curing agent, stir evenly again, and obtain reactive room temperature permeable asphalt mixture.

[0056] Furthermore, the stirring conditions in the preparation method of the reactive room temperature permeable asphalt mixture of the present invention are all carried out at room temperature, which is 15-45°C.

[0057] Furthermore, after adding the curing agent in step (5), the curing reaction time is 2 to 5 hours.

[0058] Example 1

[0059] (1) Heat 5 kg of SBS modified asphalt at 160℃ for 2 hours and keep it warm for later use;

[0060] (2) Mix 2 kg of arachidonic acid, 1 kg of petroleum resin and 0.5 kg of epoxy resin (mass ratio of 20:10:5) to obtain a reactive solvent;

[0061] (3) Add the reactive solvent to the SBS modified asphalt, stir at medium speed (100r / min) for 15min, then stir at (300r / min) for 10min until the reactive solvent is fully dispersed in the asphalt. During the stirring process, control the temperature of the asphalt to not exceed 150℃. Place the obtained reactive asphalt suspension in an 80℃ oven and let it mature for 30min before use.

[0062] (4) Add 0.5 kg of hydroxyl-terminated polybutadiene to the asphalt suspension and stir at medium speed (100 r / min) for 10 min until fully dispersed. During the stirring process, control the temperature of the asphalt to not exceed 60℃ to obtain reactive high-viscosity modified asphalt.

[0063] (5) Take 15.5 kg of aggregate according to the above OGFC-10 gradation, mix it evenly, add 0.9 kg of reactive high viscosity modified asphalt, mix it a second time, add 0.17 kg of kaolin and 0.06 kg of ordinary Portland cement (mass ratio of 155:9:1.7:0.6), mix it evenly again, and obtain reactive room temperature permeable asphalt mixture.

[0064] Example 2

[0065] (1) Heat 3.8 kg of SBS modified asphalt at 160℃ for 1.5 h and keep it warm for later use;

[0066] (2) Mix 1.6 kg of linolenic acid, 0.7 kg of petroleum resin and 0.4 kg of acrylic resin (mass ratio of 16:7:4) to obtain a reactive solvent;

[0067] (3) Add the reactive solvent to the SBS modified asphalt, stir at medium speed (120 r / min) for 13 min, and then stir at (280 r / min) for 8 min until the reactive solvent is fully dispersed in the asphalt. During the stirring process, control the temperature of the asphalt to not exceed 150℃. Place the obtained reactive asphalt suspension in an 80℃ oven and let it mature for 25 min before use.

[0068] (4) Add 0.3k oleic acid-based hydroxyethyl imidazoline to the asphalt suspension and stir at medium speed (110r / min) for 7min until fully dispersed. During the stirring process, control the temperature of the asphalt to not exceed 60℃ to obtain reactive high-viscosity modified asphalt.

[0069] (5) Weigh 10.5 kg of aggregate according to the above OGFC-13 gradation, mix it evenly, add 0.5 kg of reactive high-viscosity modified asphalt, mix it a second time, add 0.13 kg of metakaolin and 0.05 kg of silicate cement (mass ratio of 105:5:1.3:0.5), mix it evenly again, and obtain reactive room temperature permeable asphalt mixture.

[0070] Example 3

[0071] (1) Heat 7.5 kg of SBS modified asphalt at 160℃ for 2.5 h and keep it warm for later use;

[0072] (2) Mix 3.0 kg of linoleic acid, 1 kg of petroleum resin and 0.8 kg of epoxy resin (mass ratio of 30:10:8) to obtain a reactive solvent;

[0073] (3) Add the reactive solvent to the SBS modified asphalt, stir at medium speed (150 r / min) for 20 min, and then stir at (400 r / min) for 13 min until the reactive solvent is fully dispersed in the asphalt. During the stirring process, control the temperature of the asphalt to not exceed 150℃. Place the obtained reactive asphalt suspension in an 80℃ oven and let it mature for 30 min before use.

[0074] (4) Add 0.8 kg of hydroxyl-terminated polybutadiene to the asphalt suspension and stir at medium speed (120 r / min) for 10 min until fully dispersed. During the stirring process, control the temperature of the asphalt to not exceed 60℃ to obtain reactive high-viscosity modified asphalt.

[0075] (5) Take 17.5 kg of aggregate according to the above LA-13 gradation, mix it evenly, add 1.1 kg of reactive high viscosity modified asphalt, mix it a second time, add 0.3 kg of metakaolin and 0.08 kg of ordinary Portland cement (mass ratio of 175:11:3:0.8), mix it evenly again, and obtain reactive room temperature permeable asphalt mixture.

[0076] Comparative Example 1

[0077] By replacing the epoxy resin in Example 1 with acrylic resin, a reactive, room-temperature permeable asphalt mixture was prepared.

[0078] Comparative Example 2

[0079] By replacing the crosslinking agent in Example 1 with linoleic acid, a reactive, room-temperature permeable asphalt mixture was prepared.

[0080] Comparative Example 3

[0081] The mass ratio of mineral aggregate (OGFC-10), kaolin, ordinary silicate cement, and reactive room-temperature high-viscosity modified asphalt in Example 1 was replaced with 124:7:1.5:0.5 to prepare reactive room-temperature permeable asphalt mixture.

[0082] The reactive, room-temperature permeable asphalt mixtures prepared in the above examples and comparative examples were tested for asphalt mixture performance. The results are shown in Table 2.

[0083]

[0084]

[0085] Table 2 Summary of Performance Test Results

[0086] As shown in Table 2, the permeable asphalt concrete prepared from the reactive room temperature permeable asphalt mixture provided by the present invention has an initial strength of over 8kN, and its high temperature performance and water stability meet the performance requirements of hot-mix asphalt mixture.

[0087] Analysis of the implementation cases and comparative examples in the table: The road performance of the asphalt mixtures in Example 1 and Comparative Example 1 is significantly lower than that in other examples. It can be seen that the aggregate particle size is relatively coarse, which can improve the high-temperature performance of the mixture to a certain extent. From Example 1 and Comparative Example 2, it was found that the performance of the mixture in Comparative Example 2 is much worse than that in Example 1. The main reason is that the lack of crosslinking agent reduces the performance of the reactive room temperature high viscosity modified asphalt.

[0088] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A reactive, room-temperature permeable asphalt mixture, characterized in that: It includes mineral aggregates, curing agents, and reactive room-temperature high-viscosity modified asphalt; the mass ratio of mineral aggregates, curing agents, and reactive room-temperature high-viscosity modified asphalt is 92-98:1-6:2-7; The reactive high-viscosity modified asphalt at room temperature comprises the following components by mass fraction: 20-80 parts asphalt, 20-60 parts reactive diluent, 3-15 parts tackifier, and 1-5 parts crosslinking agent; The asphalt is one or two of the following: base asphalt, SBS modified asphalt, and polyurethane modified asphalt. The tackifier comprises one or more of petroleum resin, epoxy resin, and acrylic resin mixed with hydroxyl-terminated polybutadiene or oleic acid-based hydroxyethyl imidazoline. The crosslinking agent is at least one of hydroxyl-terminated polybutadiene or oleic acid-based hydroxyethyl imidazoline.

2. The reactive, room-temperature permeable asphalt mixture as described in claim 1, characterized in that: The reactive diluent is an unsaturated fatty acid; the unsaturated fatty acid includes one or more of linoleic acid, linolenic acid, arachidonic acid, peanut oil, coconut oil, and corn oil.

3. The reactive, room-temperature permeable asphalt mixture as described in claim 1, characterized in that: The curing agent is one or two types of metakaolin or kaolin mixed with one or more types of ordinary silicate cement, silicate cement, or sulfoaluminate cement in a 4:1 ratio.

4. The reactive, room-temperature permeable asphalt mixture as described in claim 1, characterized in that: The curing agent is one or two types of metakaolin or kaolin mixed with one or more types of ordinary silicate cement, silicate cement, or sulfoaluminate cement in a ratio of 3.5:1.

5.

5. The reactive, room-temperature permeable asphalt mixture as described in claim 1, characterized in that: The mineral material is at least one of granite, diabase, and basalt.

6. A method for preparing reactive, room-temperature permeable asphalt mixture according to any one of claims 1-5, characterized in that, Includes the following steps: (1) Heat the asphalt at 160℃ for 1.5-2.5h and keep it warm for later use; (2) The reactive diluent and thickener are mixed to obtain a reactive solvent; (3) Add the reactive solvent to the asphalt, stir at 100 r / min for 15 min, then stir at 300 r / min for 10 min until the reactive solvent is fully dispersed in the asphalt. During the stirring process, control the temperature of the asphalt to not exceed 150℃. Place the obtained reactive asphalt suspension in an 80℃ oven and let it mature for 30 min before use. (4) Add the crosslinking agent to the asphalt suspension and stir at 100 r / min for 10 min until fully dispersed. During the stirring process, control the temperature of the asphalt to not exceed 60℃ to obtain reactive room temperature high viscosity modified asphalt. (5) After the aggregate is mixed evenly, add reactive high-viscosity modified asphalt, stir twice, add curing agent, stir evenly again, and obtain reactive room temperature permeable asphalt mixture.

7. A method for preparing reactive, room-temperature permeable asphalt mixture according to claim 6, characterized in that, After adding the curing agent in step (5), the curing reaction takes 2 to 5 hours.

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