Resin-reinforced asphalt concrete and preparation method thereof

Abstract

The invention relates to a resin-reinforced asphalt concrete and a preparation method thereof, belonging to the technical field of asphalt concrete. The resin-reinforced asphalt concrete comprises, by weight, 60-80 parts of road asphalt, 18-25 parts of epoxy main agent, 9-13 parts of epoxy modifier, 6-10 parts of curing agent, 5-8 parts of active diluent, 800-1050 parts of coarse aggregate, 120-220 parts of fine aggregate and 80-140 parts of mineral powder; the epoxy modifier is based on a low-molecular-weight double-terminated hydroxyl silicone oil, and is substituted by methylvinyldichlorosilane and a slightly excessive amount of hydroxyl silicone oil to prepare a low-molecular-weight polymer with an organic silicon chain as the main chain, a hydroxyl group at the end, and a double bond in the side chain, namely, an intermediate; then, epichlorohydrin and the terminal hydroxyl group of the intermediate are ring-opened, and then the ring is closed under the promotion of the strong alkalinity of sodium hydroxide, and the end of the intermediate molecule is grafted with epoxy groups for modification, so as to obtain the epoxy modifier, which is added to the asphalt concrete to greatly improve the strength and toughness.

Description

Technical Field

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

[0002] Resin-reinforced asphalt concrete is a composite material that improves the performance of asphalt concrete by adding resin. At present, the resins used in asphalt concrete are mainly epoxy resin and polyester resin. Among them, epoxy resin has excellent adhesion, which can improve the adhesion between asphalt concrete layers, reduce interlayer slippage, and improve the stability of the overall structure. Epoxy resin has high strength and rigidity, which can significantly improve the compressive strength, tensile strength and flexural strength of asphalt concrete, making the road surface more able to withstand heavy loads and traffic impacts. However, epoxy resin is very brittle, especially in low temperature environments, and the road surface is prone to breakage when subjected to external loads. Summary of the invention

[0003] In order to solve the technical problems mentioned in the background technology, the object of the present invention is to provide a resin-reinforced asphalt concrete and a preparation method thereof.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A resin-reinforced asphalt concrete comprises, by weight, 60-80 parts of road asphalt, 18-25 parts of epoxy main agent, 9-13 parts of epoxy modifier, 6-10 parts of curing agent, 5-8 parts of active diluent, 800-1050 parts of coarse aggregate, 120-220 parts of fine aggregate and 80-140 parts of mineral powder.

[0006] The epoxy modifier is prepared by the following method:

[0007] Step A1: hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran are mixed, dry nitrogen is introduced for protection, an ice-water bath is controlled at 5-15°C, stirring is applied at 120-180 rpm, methylvinyldichlorosilane is slowly added and reacted for 4-6 hours, tetrahydrofuran is removed by rotary evaporation after the reaction is completed, the liquid is washed with water, and vacuum dried to obtain an intermediate;

[0008] Furthermore, the usage ratio of methylvinyldichlorosilane, the hydroxyl content of hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran is 0.1 mol: 0.105-0.11 mol: 10-15 mL: 80-100 mL, and under low temperature conditions, methylvinyldichlorosilane is replaced with a slightly excess of hydroxy silicone oil.

[0009] Furthermore, the hydroxy silicone oil is a double-terminated hydroxy silicone oil, and the room temperature viscosity is higher than 100 mm 2 / s.

[0010] Step A2: The intermediate, epichlorohydrin and dimethylacetamide are mixed, nitrogen protection is introduced, the temperature is raised to 45-55° C., and the reaction is stirred at 60-90 rpm for 1.5-2 hours, and then sodium hydroxide solution is added and mixed, and the temperature is further raised to 80-100° C., the stirring rate is increased to 120-150 rpm and the reaction is carried out for 1-1.5 hours. After the reaction is completed and cooled, the liquid is washed with water and methanol in turn, and vacuum dried to obtain an epoxy modifier;

[0011] Furthermore, the hydroxyl content of the intermediate, epichlorohydrin, sodium hydroxide and dimethylacetamide are used in a ratio of 10mmol:40-55mmol:15-22g:60-80mL, epichlorohydrin and the terminal hydroxyl groups of the intermediate are ring-opened, and then ring-closed under the promotion of the strong alkalinity of sodium hydroxide, thereby grafting epoxy groups on the ends of the intermediate molecules for modification.

[0012] Preferably, the epoxy main agent is selected from bisphenol A epoxy resin.

[0013] Preferably, the curing agent is selected from high temperature anhydride curing agents.

[0014] Preferably, the reactive diluent is allyl glycidyl ether.

[0015] A method for preparing resin-reinforced asphalt concrete comprises the following steps:

[0016] Step S1: Mix road asphalt, epoxy main agent, epoxy modifier, active diluent and curing agent, heat to 110-125° C. and premix evenly to obtain oil;

[0017] Step S2: coarse aggregate, fine aggregate and mineral powder are mixed, pre-dried to 150-160° C., and oil is added and mixed to obtain resin-reinforced asphalt concrete.

[0018] Beneficial effects of the present invention:

[0019] The present invention adopts epoxy resin to strengthen asphalt concrete. Compared with the existing products, a self-developed epoxy modifier is added to improve the toughness of concrete. The epoxy modifier is based on a small molecular weight double-terminal hydroxyl silicone oil, and is replaced by methyl vinyl dichlorosilane and a slightly excessive amount of hydroxyl silicone oil to prepare a low molecular weight polymer with an organic silicon chain as the main chain, a hydroxyl group at the end, and a double bond in the side chain, which is an intermediate. Then, epichlorohydrin and the terminal hydroxyl group of the intermediate are opened, and then the ring is closed under the promotion of the strong alkalinity of sodium hydroxide, and the end of the intermediate molecule is grafted with epoxy groups for modification, that is, An epoxy modifier is obtained; during the curing process of asphalt concrete, the terminal epoxy structure of the epoxy modifier is open-ring cross-linked with the epoxy main agent, and at the same time, the double bonds on its side chain are added to the unsaturated structure in the asphalt at high temperature, and the epoxy modifier plays a bridging role, strengthening the bonding strength between the epoxy main agent and the asphalt, thereby strengthening the bonding strength between aggregates; the long silicone chain in the main chain of the epoxy modifier is a flexible soft chain, which reduces the rigidity of the epoxy cross-linking network. At the same time, the doping of the silicone chain block weakens the interaction between the epoxy polymer chains, effectively reducing the brittleness problem caused by the epoxy resin reinforced asphalt concrete. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1, preparing resin-enhanced asphalt concrete, the specific implementation process is as follows:

[0022] (1) Preparation of epoxy modifier

[0023] Step A1: Mix hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran, introduce dry nitrogen protection, control the temperature at 15°C in an ice-water bath, apply stirring at 180 rpm, slowly add methylvinyldichlorosilane, the addition time is 1 hour, continue to stir at constant temperature after complete addition, and control the total addition reaction time of methylvinyldichlorosilane to be 4 hours, wherein the hydroxy silicone oil is selected from KF-6002 double-terminal hydroxy silicone oil, and the room temperature viscosity is 70 mm 2 / s, the usage ratio of methylvinyldichlorosilane, the hydroxyl content of hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran is 0.1 mol: 0.11 mol: 15 mL: 100 mL. After the reaction, tetrahydrofuran is removed by rotary evaporation, the liquid is washed with water and dried in vacuo to obtain an intermediate.

[0024] Step A2: Take the intermediate, epichlorohydrin and dimethylacetamide, mix them, pass nitrogen protection, heat to 55°C, apply 90rpm stirring to react for 1.5h, take sodium hydroxide to prepare a saturated aqueous solution at room temperature, add sodium hydroxide solution to mix, continue to heat to 100°C, increase the stirring rate to 150rpm to react for 1h, wherein the hydroxyl content of the intermediate, epichlorohydrin, sodium hydroxide and dimethylacetamide are used in a ratio of 10mmol:55mmol:22g:80mL. After the reaction is completed and cooled, the liquid is washed with water and methanol in turn, and vacuum dried to obtain an epoxy modifier.

[0025] (2) Preparation of resin-enhanced asphalt concrete

[0026] Ingredients: the raw materials are calculated by weight: 60 parts of road asphalt, 70# road asphalt is used in the implementation process; 18 parts of epoxy main agent, E51 bisphenol A epoxy resin is used in the implementation process; 10 parts of epoxy modifier, which is self-made in this embodiment; 6 parts of curing agent, methyl nadic anhydride, a high-temperature acid anhydride curing agent, is used in the implementation process; 5 parts of active diluent, allyl glycidyl ether is used in the implementation process; 800 parts of coarse aggregate, 3-15mm graded crushed stone is used in the implementation process; 150 parts of fine aggregate, machine-made sand with a fineness modulus of 2.5-3.5 is used in the implementation process; 80 parts of mineral powder, S95 grade limestone mineral powder is used in the implementation process.

[0027] Step S1: mixing road asphalt, epoxy main agent, epoxy modifier, active diluent and curing agent, heating to 125° C. and premixing evenly to obtain oil;

[0028] Step S2: coarse aggregate, fine aggregate and mineral powder are mixed, pre-dried to 160° C., and oil is added and mixed to obtain resin-reinforced asphalt concrete.

[0029] Example 2, preparing resin-enhanced asphalt concrete, the specific implementation process is as follows:

[0030] (1) Preparation of epoxy modifier

[0031] Step A1: Mix hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran, introduce dry nitrogen protection, control the temperature at 5°C in an ice-water bath, apply stirring at 120rpm, slowly add methylvinyldichlorosilane, the addition time is 2h, continue to stir at constant temperature after complete addition, and control the total addition reaction time of methylvinyldichlorosilane to be 6h, wherein the hydroxy silicone oil is selected from KF-6000 type double-terminal hydroxy silicone oil, and the room temperature viscosity is 35mm 2 / s, the usage ratio of methylvinyldichlorosilane, the hydroxyl content of hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran is 0.1 mol: 0.105 mol: 10 mL: 80 mL. After the reaction, tetrahydrofuran is removed by rotary evaporation, the liquid is washed with water and dried in vacuo to obtain an intermediate.

[0032] Step A2: Take the intermediate, epichlorohydrin and dimethylacetamide, mix them, pass nitrogen protection, heat to 45°C, apply 60rpm stirring to react for 2h, take sodium hydroxide to prepare a saturated aqueous solution at room temperature, add sodium hydroxide solution to mix, continue to heat to 80°C, increase the stirring rate to 120rpm and react for 1.5h, wherein the hydroxyl content of the intermediate, epichlorohydrin, sodium hydroxide and dimethylacetamide are used in a ratio of 10mmol:40mmol:15g:60mL. After the reaction is completed and cooled, the liquid is washed with water and methanol in turn, and vacuum dried to obtain an epoxy modifier.

[0033] (2) Preparation of resin-enhanced asphalt concrete

[0034] Ingredients: the raw materials are calculated by weight: 80 parts of road asphalt, 70# road asphalt is used in the implementation process; 25 parts of epoxy main agent, E51 bisphenol A epoxy resin is used in the implementation process; 13 parts of epoxy modifier, which is self-made in this embodiment; 10 parts of curing agent, high-temperature acid anhydride curing agent methyl nadic anhydride is used in the implementation process; 8 parts of active diluent, allyl glycidyl ether is used in the implementation process; 1050 parts of coarse aggregate, 3-15mm graded crushed stone is used in the implementation process; 220 parts of fine aggregate, machine-made sand with a fineness modulus of 2.5-3.5 is used in the implementation process; 140 parts of mineral powder, S95 grade limestone mineral powder is used in the implementation process.

[0035] Step S1: mixing road asphalt, epoxy main agent, epoxy modifier, active diluent and curing agent, heating to 110° C. and premixing evenly to obtain oil;

[0036] Step S2: coarse aggregate, fine aggregate and mineral powder are mixed, pre-dried to 150° C., and oil is added and mixed to obtain resin-reinforced asphalt concrete.

[0037] Example 3, preparing resin-enhanced asphalt concrete, the specific implementation process is as follows:

[0038] (1) Preparation of epoxy modifier

[0039] Step A1: Mix hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran, introduce dry nitrogen protection, control the temperature at 10°C in an ice-water bath, apply stirring at 150rpm, slowly add methylvinyldichlorosilane, the addition time is 1.5h, continue to stir at constant temperature after complete addition, and control the total addition reaction time of methylvinyldichlorosilane to be 5h, wherein the hydroxy silicone oil is selected from KF-6001 double-terminal hydroxy silicone oil, and the room temperature viscosity is 45mm 2 / s, the usage ratio of methylvinyldichlorosilane, the hydroxyl content of hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran is 0.1 mol: 0.108 mol: 12 mL: 90 mL. After the reaction, tetrahydrofuran is removed by rotary evaporation, the liquid is washed with water and dried in vacuo to obtain an intermediate.

[0040] Step A2: Take the intermediate, epichlorohydrin and dimethylacetamide, mix them, pass nitrogen protection, heat to 50°C, apply 60rpm stirring to react for 1.7h, take sodium hydroxide to prepare a saturated aqueous solution at room temperature, add sodium hydroxide solution to mix, continue to heat to 90°C, increase the stirring rate to 150rpm and react for 1.2h, wherein the hydroxyl content of the intermediate, epichlorohydrin, sodium hydroxide and dimethylacetamide are used in a ratio of 10mmol:45mmol:18g:70mL. After the reaction is completed and cooled, the liquid is washed with water and methanol in turn, and vacuum dried to obtain an epoxy modifier.

[0041] (2) Preparation of resin-enhanced asphalt concrete

[0042] Ingredients: the raw materials are calculated by weight: 70 parts of road asphalt, 70# road asphalt is used in the implementation process; 20 parts of epoxy main agent, E51 bisphenol A epoxy resin is used in the implementation process; 9 parts of epoxy modifier, which is self-made in this embodiment; 8 parts of curing agent, high-temperature acid anhydride curing agent methyl nadic anhydride is used in the implementation process; 7 parts of active diluent, allyl glycidyl ether is used in the implementation process; 950 parts of coarse aggregate, 3-15mm graded crushed stone is used in the implementation process; 120 parts of fine aggregate, machine-made sand with a fineness modulus of 2.5-3.5 is used in the implementation process; 100 parts of mineral powder, S95 grade limestone mineral powder is used in the implementation process.

[0043] Step S1: Mix road asphalt, epoxy main agent, epoxy modifier, active diluent and curing agent, heat to 115° C. and premix evenly to obtain oil;

[0044] Step S2: coarse aggregate, fine aggregate and mineral powder are mixed, pre-dried to 155° C., and oil is added and mixed to obtain resin-reinforced asphalt concrete.

[0045] Example 4, preparing resin-enhanced asphalt concrete, the specific implementation process is as follows:

[0046] (1) Preparation of epoxy modifier

[0047] Step A1: Mix hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran, introduce dry nitrogen protection, control the temperature at 5°C in an ice-water bath, apply stirring at 180 rpm, slowly add methylvinyldichlorosilane, the addition time is 1.8 hours, continue to stir at constant temperature after complete addition, and control the total addition reaction time of methylvinyldichlorosilane to be 5.5 hours, wherein the hydroxy silicone oil is selected from KF-6001 double-terminal hydroxy silicone oil, and the room temperature viscosity is 45 mm 2 / s, the usage ratio of methylvinyldichlorosilane, the hydroxyl content of hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran is 0.1 mol: 0.108 mol: 15 mL: 90 mL. After the reaction, tetrahydrofuran is removed by rotary evaporation, the liquid is washed with water and dried in vacuo to obtain an intermediate.

[0048] Step A2: Take the intermediate, epichlorohydrin and dimethylacetamide, mix them, pass nitrogen protection, heat to 55°C, apply 90rpm stirring to react for 1.8h, take sodium hydroxide to prepare a saturated aqueous solution at room temperature, add sodium hydroxide solution to mix, continue to heat to 90°C, increase the stirring rate to 150rpm and react for 1.3h, wherein the hydroxyl content of the intermediate, epichlorohydrin, sodium hydroxide and dimethylacetamide are used in a ratio of 10mmol:50mmol:20g:80mL. After the reaction is completed and cooled, the liquid is washed with water and methanol in turn, and vacuum dried to obtain an epoxy modifier.

[0049] (2) Preparation of resin-enhanced asphalt concrete

[0050] Ingredients: the raw materials are calculated by weight: 75 parts of road asphalt, 70# road asphalt is used in the implementation process; 22 parts of epoxy main agent, E51 bisphenol A epoxy resin is used in the implementation process; 11 parts of epoxy modifier, which is self-made in this embodiment; 9 parts of curing agent, methyl nadic anhydride, a high-temperature acid anhydride curing agent, is used in the implementation process; 7 parts of active diluent, allyl glycidyl ether is used in the implementation process; 1000 parts of coarse aggregate, 3-15mm graded crushed stone is used in the implementation process; 160 parts of fine aggregate, machine-made sand with a fineness modulus of 2.5-3.5 is used in the implementation process; 120 parts of mineral powder, S95 grade limestone mineral powder is used in the implementation process.

[0051] Step S1: Mix road asphalt, epoxy main agent, epoxy modifier, active diluent and curing agent, heat to 120° C. and premix evenly to obtain oil;

[0052] Step S2: coarse aggregate, fine aggregate and mineral powder are mixed, pre-dried to 160° C., and oil is added and mixed to obtain resin-reinforced asphalt concrete.

[0053] Comparative Example

[0054] This comparative example refers to Example 4, except that the epoxy modifier is replaced with the same weight portion of the epoxy main agent, and the rest of the implementation process is exactly the same.

[0055] The resin-reinforced asphalt concrete prepared above was laid into the mold, compacted and solidified at 2MPa, and naturally cured for 72h. The low-temperature beam bending test was carried out according to the JTG / T 3364-02-2019 specification. The test temperature was -10℃, and the key indicators of flexural strength, maximum flexural strain and stiffness modulus were tested. The specific test data are shown in Table 1 below:

[0056] Table 1

[0057]

[0058] From the test data in the above table, it can be seen that the flexural tensile strength of the asphalt concrete prepared in the embodiment is 43.19-48.52MPa, the stiffness modulus is 14865.3-15384.7MPa, and the maximum flexural tensile strain is 4326-5492×10 -6 , compared with the control example, it has excellent comprehensive strength and toughness properties.

[0059] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A resin-reinforced asphalt concrete, It is characterized in that The composition includes, by weight: 60-80 parts of road asphalt, 18-25 parts of epoxy main agent, 9-13 parts of epoxy modifier, 6-10 parts of curing agent, 5-8 parts of active diluent, 800-1050 parts of coarse aggregate, 120-220 parts of fine aggregate and 80-140 parts of mineral powder; The epoxy modifier is prepared by the following method: Step A1: hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran are mixed, dry nitrogen is introduced for protection, an ice-water bath is controlled at 5-15°C, methylvinyldichlorosilane is slowly added with stirring for 4-6 hours, tetrahydrofuran is removed by rotary evaporation after the reaction is completed, the separated liquid is washed with water, and vacuum dried to obtain an intermediate; Step A2: The intermediate, epichlorohydrin and dimethylacetamide are mixed, nitrogen is introduced for protection, the temperature is raised to 45-55°C, and the reaction is stirred for 1.5-2h, and then sodium hydroxide solution is added and mixed, and the temperature is continued to be raised to 80-100°C, and the stirring rate is increased to continue the reaction for 1-1.5h. After the reaction is completed and cooled, the liquid is washed with water and methanol in turn, and vacuum dried to obtain an epoxy modifier; The epoxy main agent is bisphenol A type epoxy resin.

2. The resin-reinforced asphalt concrete according to claim 1, It is characterized in that The usage ratio of methylvinyldichlorosilane, the hydroxyl content of hydroxy silicone oil, triethylamine and anhydrous tetrahydrofuran is 0.1 mol: 0.105-0.11 mol: 10-15 mL: 80-100 mL.

3. The resin-reinforced asphalt concrete according to claim 2, It is characterized in that Hydroxyl silicone oil is a double-terminal hydroxy silicone oil with a room temperature viscosity higher than 100mm 2 / s.

4. The resin-reinforced asphalt concrete according to claim 3, It is characterized in that The usage ratio of the hydroxyl content of the intermediate, epichlorohydrin, sodium hydroxide and dimethylacetamide is 10mmol:40-55mmol:15-22g:60-80mL.

5. The resin-reinforced asphalt concrete according to claim 1, It is characterized in that The curing agent is a high temperature acid anhydride curing agent.

6. The resin-reinforced asphalt concrete according to claim 1, It is characterized in that The active diluent is allyl glycidyl ether.

7. A method for preparing resin-reinforced asphalt concrete according to any one of claims 1 to 6, It is characterized in that The steps include: Step S1: Mix road asphalt, epoxy main agent, epoxy modifier, active diluent and curing agent, heat to 110-125° C. and premix evenly to obtain oil; Step S2: coarse aggregate, fine aggregate and mineral powder are mixed, pre-dried to 150-160° C., and oil is added and mixed to obtain resin-reinforced asphalt concrete.

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