Semi-flexible normal-temperature asphalt mixture as well as preparation method and application thereof

Abstract

The invention provides a semi-flexible normal-temperature asphalt mixture as well as a preparation method and application thereof, and particularly belongs to the technical field of pavement building materials and engineering. The semi-flexible normal-temperature asphalt mixture comprises asphalt liquid and a pre-reaction mineral aggregate, the mass ratio of the asphalt liquid to the pre-reaction mineral aggregate is (6-8): 100; the asphalt liquid comprises the following components in parts by mass: 56-70 parts of asphalt, 1-6 parts of a temperature range regulator, 20-33 parts of a reactive diluent, 3-9 parts of an adhesive, 0.4-0.5 part of a reactant and 0.5-0.6 part of an anti-stripping agent; the pre-reaction mineral aggregate comprises the following components in parts by mass: 100 parts of aggregate, 0.1-0.3 part of polyester fiber, 2-3 parts of a curing agent and 0.05-0.15 part of an accelerant. The stearic acid organic salt generated by the reactive diluent and the curing agent reacts with the vulcanized rubber generated by the binder and the reactant to generate the stearic acid organic salt and the macromolecular vulcanized silicone rubber, so that the bonding strength can be quickly improved.

Description

Technical Field

[0001] The invention belongs to the field of road construction materials and engineering technology, and specifically relates to a semi-flexible room-temperature asphalt mixture and a preparation method and application thereof. Background Art

[0002] Hot mix asphalt has become the mainstream paving material in the current road industry due to its excellent comprehensive performance, but it has difficult-to-overcome technical problems such as high power consumption and heavy pollution. Warm mix asphalt has reduced the construction mixing temperature to a certain extent, but has not completely solved the emission problem of toxic and harmful gases in asphalt smoke.

[0003] In contrast, room temperature asphalt mixtures can be mixed, spread and rolled in a wider temperature range (-20 to 50°C), and are a low-carbon and green asphalt pavement material. In recent years, room temperature asphalt mixtures represented by water-based, solvent-based and reactive types have been continuously developed and applied, but there are still some technical problems that need to be solved: (1) Water-based types include foamed asphalt and emulsified asphalt, which use water as a medium to bind asphalt. The aggregate is highly coated, but the strength develops slowly, and the water damage resistance and high temperature performance are insufficient; (2) Solvent-based asphalt is diluted with organic volatiles such as diesel, kerosene, and benzene. The mixture can only form strength after volatilization. It has good workability, convenient construction and storage, but low early strength and poor durability; (3) Reactive room temperature asphalt mixtures add two-component or single-component reactive resins to emulsified asphalt or diluted asphalt, and form strength by bonding mineral aggregates based on the principles of cross-linking curing and wet curing. Common ones include epoxy resins and polyurethanes. However, epoxy resin-based room temperature asphalt mixtures have poor low-temperature flexibility, the binder has problems with toughening modification and material compatibility, the raw materials of polyurethane-based room temperature asphalt mixtures are diverse and expensive, and the retention time and compaction timing during construction are difficult to grasp. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a semi-flexible room temperature asphalt mixture and its preparation method and application. The semi-flexible room temperature asphalt mixture provided by the present invention has fast early strength formation, high construction efficiency, strong operability, and long service durability, and can be used in scenes such as the lower layer, middle surface layer, upper layer, ultra-thin wear layer, and pothole repair material under different traffic grade conditions.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The present invention provides a semi-flexible room temperature asphalt mixture, comprising asphalt liquid and pre-reacted mineral material; the mass ratio of the asphalt liquid to the pre-reacted mineral material is 6 to 8:100;

[0007] In terms of parts by mass, the asphalt liquid includes 56 to 70 parts of asphalt, 1 to 6 parts of temperature range regulator, 20 to 33 parts of active diluent, 3 to 9 parts of adhesive, 0.4 to 0.5 parts of reactant, and 0.5 to 0.6 parts of anti-stripping agent;

[0008] Calculated by weight, the pre-reaction mineral material includes 100 parts of aggregate, 0.1 to 0.3 parts of polyester fiber, 2 to 3 parts of curing agent, and 0.05 to 0.15 parts of accelerator.

[0009] Preferably, the temperature range regulator is one or more of ethyl 3-ethoxypropionate, n-butanol, n-hexadecyl alcohol and isobutyl acetate.

[0010] Preferably, when the temperature range regulator is ethyl 3-ethoxypropionate and isobutyl acetate, the mass ratio of ethyl 3-ethoxypropionate to isobutyl acetate is 3 to 1:1.

[0011] Preferably, the active diluent is one or more of perilla seed oleic acid, coconut oleic acid and olive oil oleic acid;

[0012] The adhesive is hydroxyl-terminated polysiloxane.

[0013] Preferably, the reactant is one or more of tetrabutyl ketoxime silane, methyltriethoxysilane and vinyltriethoxysilane;

[0014] The anti-stripping agent is p-phenylenediamine ET-2500 or non-amine LURA.

[0015] Preferably, the curing agent is one or more of amino acid, sodium alkylbenzene sulfonate and sodium bicarbonate;

[0016] The accelerator is dibutyltin laurate or dibutyltin diacetate.

[0017] Preferably, the polyester fiber has a nominal length of 1 to 5 mm, a monofilament diameter of 8 to 12 μm, and an elastic modulus of more than 10×10 3 MPa.

[0018] The present invention also provides a method for preparing the semi-flexible room temperature asphalt mixture described in the above technical solution, comprising the following steps:

[0019] The asphalt is heated to a molten state, an active diluent is added, and a first stirring is performed to obtain a mixed asphalt. The mixed asphalt is cooled to 60-70° C., a temperature range regulator, a binder, a accelerator and an anti-stripping agent are added, and a second stirring is performed to obtain an asphalt liquid;

[0020] The aggregate, polyester fiber, accelerator and curing agent are mixed to obtain a pre-reacted mineral material;

[0021] The asphalt liquid and the pre-reacted mineral material are mixed to obtain the semi-flexible room temperature asphalt mixture.

[0022] Preferably, the heating temperature is 130-140°C.

[0023] The present invention also provides the use of the semi-flexible room-temperature asphalt mixture prepared by the preparation method described in the above technical solution in road surface layers, ultra-thin wear layers and pothole repair materials.

[0024] The present invention provides a semi-flexible room-temperature asphalt mixture, comprising asphalt liquid and pre-reacted mineral material; the mass ratio of the asphalt liquid to the pre-reacted mineral material is 6-8:100; in terms of mass parts, the asphalt liquid comprises 56-70 parts of asphalt, 1-6 parts of temperature range regulator, 20-33 parts of active diluent, 3-9 parts of adhesive, 0.4-0.5 parts of reactant, and 0.5-0.6 parts of anti-stripping agent; in terms of mass parts, the pre-reacted mineral material comprises 100 parts of aggregate, 0.1-0.3 parts of polyester fiber, 2-3 parts of curing agent, and 0.05-0.15 parts of accelerator. The present invention reduces the viscosity of asphalt at room temperature by adding an active diluent, and adds a small amount of temperature range regulator to adapt to different construction environments. When the asphalt liquid is fully in contact with the pre-reacted mineral material, the active diluent and the curing agent undergo a coupling reaction to generate an organic stearic acid salt, and the promoter acts as a catalyst to accelerate the vulcanization reaction between the adhesive and the reactant to generate vulcanized rubber. Subsequently, the organic stearic acid salt and the vulcanized rubber undergo a polymerization reaction to generate an organic stearic acid salt and a high-molecular vulcanized silicone rubber, thereby rapidly improving the bonding strength and low-temperature toughness of the asphalt mixture. The addition of polyester fiber improves the low-temperature toughness of the mixture.

[0025] In addition, the present invention also provides a method for preparing a semi-flexible normal asphalt mixture, which is simple to prepare, low in cost, ready to mix and ready to use, high in construction efficiency, strong in operability, and suitable for industrial production.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) Compared with conventional room temperature asphalt mixtures, the semi-flexible room temperature asphalt mixture of the present invention has faster early strength formation, can be used immediately after mixing, has high construction efficiency, and is highly operable. The active diluent and temperature range regulator are used in conjunction with molten asphalt to flexibly adjust the construction and workability of the mixture, which not only ensures the adhesion and bonding effect of the asphalt liquid and the aggregate, but also makes the compaction more dense, thereby improving the durability of the mixture.

[0028] (2) The semi-flexible room temperature asphalt mixture of the present invention is simpler to prepare and has lower cost than the reactive room temperature asphalt mixture. The addition of organic polymerization products (stearic acid organic salt, polymer vulcanized silicone rubber) and fibers forms a complex cross-linked network inside the mixture, which has excellent low-temperature flexibility and further improves high-temperature anti-rutting performance.

[0029] (3) Semi-flexible room temperature asphalt mixture can achieve the performance conversion from ordinary asphalt mixture to high-viscosity asphalt mixture by adjusting the amount of active diluent and adhesive, so as to be suitable for scenes such as lower layer, middle surface layer, upper layer, ultra-thin wear layer, pothole repair material, etc. under different traffic conditions.

[0030] Through experimental tests, the semi-flexible room temperature asphalt mixture prepared by the present invention has performance that exceeds the technical requirements for modified asphalt mixture in the current "Technical Specifications for Highway Asphalt Pavement Construction" JTG F40-2004, and can meet the construction and workability requirements in an ultra-wide temperature range of -20 to 50°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 The low-temperature Brookfield viscosity performance of the asphalt liquid prepared in Examples 1 to 8 of the present invention in different temperature ranges. DETAILED DESCRIPTION

[0033] The present invention provides a semi-flexible room temperature asphalt mixture, comprising asphalt liquid and pre-reacted mineral material; the mass ratio of the asphalt liquid to the pre-reacted mineral material is 6 to 8:100;

[0034] In terms of parts by mass, the asphalt liquid includes 56 to 70 parts of asphalt, 1 to 6 parts of temperature range regulator, 20 to 33 parts of active diluent, 3 to 9 parts of adhesive, 0.4 to 0.5 parts of reactant, and 0.5 to 0.6 parts of anti-stripping agent;

[0035] Calculated by weight, the pre-reaction mineral material includes 100 parts of aggregate, 0.1 to 0.3 parts of polyester fiber, 2 to 3 parts of curing agent, and 0.05 to 0.15 parts of accelerator.

[0036] In the present invention, unless otherwise specified, the raw materials and equipment used are commercially available products well known in the art.

[0037] Next, the asphalt liquid will be described.

[0038] In the present invention, the asphalt liquid includes, by weight, 56 to 70 parts of asphalt, 1 to 6 parts of temperature range regulator, 20 to 33 parts of active diluent, 3 to 9 parts of adhesive, 0.4 to 0.5 parts of reactant, and 0.5 to 0.6 parts of anti-stripping agent.

[0039] In terms of mass fraction, the asphalt liquid provided by the present invention comprises 56 to 70 parts of asphalt, preferably 60 to 65 parts. In the present invention, the asphalt is preferably 70# Esso asphalt. In a specific embodiment of the present invention, the mass fractions of asphalt are 56, 65 or 70 parts respectively.

[0040] Based on the unit mass fraction of the asphalt, the asphalt liquid provided by the present invention includes 1 to 6 parts of temperature range regulator, preferably 2 to 5 parts. In a specific embodiment of the present invention, the mass fractions of the temperature range regulator are 1, 2, 3, 4, 5 or 6 parts respectively. In the present invention, the temperature range regulator is preferably one or more of ethyl 3-ethoxypropionate, n-butanol, n-hexadecyl alcohol and isobutyl acetate, more preferably one or two of ethyl 3-ethoxypropionate and isobutyl acetate, and further preferably ethyl 3-ethoxypropionate and isobutyl acetate. The selection of the temperature range regulator can be based on the construction season or environmental requirements, and can be formulated into a series of temperature range regulators with different melting points in a certain proportion, and the synergistic active diluent can be used to adjust the construction and workability of the room temperature asphalt mixture at different temperatures.

[0041] In the present invention, when the temperature range regulator is preferably ethyl 3-ethoxypropionate and isobutyl acetate, the ratio of ethyl 3-ethoxypropionate to isobutyl acetate is preferably 3 to 1:1, more preferably 3:1, 2:1 or 1:1. When the temperature range regulator is prepared with ethyl 3-ethoxypropionate and isobutyl acetate in different proportions, the minimum ambient temperature used is different, as shown in Table 1 below.

[0042] Table 1 Application temperature range of different mass ratios of ethyl 3-ethoxypropionate and isobutyl acetate and different amounts of temperature regulator

[0043]

[0044]

[0045] Based on the unit mass fraction of the asphalt, the asphalt liquid provided by the present invention includes 20 to 33 parts of active diluent. In a specific embodiment of the present invention, the mass fractions of the active diluent are 20, 23, 27, 30, 32 or 33 parts respectively. In the present invention, the active diluent is preferably one or more of perilla seed oleic acid, coconut oleic acid and olive oil acid, more preferably perilla seed oleic acid, coconut oleic acid or olive oil acid. The addition of the active diluent can initially reduce the Brookfield viscosity of the asphalt and serve as a reactant for subsequent acid-base coupling.

[0046] Based on the unit mass fraction of the asphalt, the asphalt liquid provided by the present invention includes 3 to 9 parts of binder, preferably 4 to 8 parts. In a specific embodiment of the present invention, the mass fraction of the binder is 4, 5, 7, 8 or 9 parts respectively. In the present invention, the binder is preferably a terminal hydroxyl polysiloxane. The binder is added as an elastic matrix material.

[0047] Based on the unit mass fraction of the asphalt, the asphalt liquid provided by the present invention includes 0.4 to 0.5 parts of reactants. In the present invention, the reactant is preferably one or more of tetrabutyl ketoxime silane, methyl triethoxy silane and vinyl triethoxy silane, and more preferably tetrabutyl ketoxime silane. Under the action of the accelerator, the reactant is hydrolyzed to generate CH3Si(OH)3 after contacting with water vapor in the air, and will undergo polymerization reaction with the adhesive at room temperature to generate high molecular weight vulcanized silicone rubber, thereby improving the flexibility of the mixture.

[0048] Based on the unit mass fraction of the asphalt, the asphalt liquid provided by the present invention includes 0.5 to 0.6 parts of an anti-stripping agent. In the present invention, the anti-stripping agent is preferably p-phenylenediamine ET-2500 or non-amine LURA, more preferably non-amine LURA. The anti-stripping agent can enhance the asphalt-aggregate interface bonding, thereby improving the water damage resistance of the asphalt mixture; it can be applied to acidic and alkaline stones, and has excellent stability.

[0049] The pre-reaction mineral material is described below.

[0050] The pre-reaction mineral material provided by the present invention includes 100 parts of aggregate by weight. In the present invention, the aggregate is preferably any one of limestone, basalt and diabase. The present invention utilizes aggregates of different lithologies to mix with asphalt to form an asphalt mixture to meet the needs of different application scenarios.

[0051] Based on the unit mass fraction of the aggregate, the pre-reacted mineral material provided by the present invention includes 0.1 to 0.3 parts of polyester fiber. In the present invention, the nominal length of the polyester fiber is preferably 1 to 5 mm, the monofilament diameter is preferably 8 to 12 μm, and the elastic modulus is preferably greater than 10×10 3 MPa. Polyester fiber is mostly used for reinforcement in asphalt mixtures of highway projects, which can improve the low-temperature toughness of the mixture.

[0052] Based on the unit mass fraction of the aggregate, the pre-reacted mineral material provided by the present invention includes 2 to 3 parts of a curing agent. In the present invention, the curing agent is preferably one or more of amino acid, sodium alkylbenzene sulfonate and sodium bicarbonate, more preferably sodium alkylbenzene sulfonate.

[0053] Based on the unit mass of the aggregate, the pre-reacted mineral material provided by the present invention includes 0.05 to 0.15 parts of an accelerator. In the present invention, the accelerator is preferably dibutyltin laurate or dibutyltin diacetate. The accelerator acts as a catalyst to accelerate the reaction rate of the reactant and the binder.

[0054] The semi-flexible room temperature asphalt mixture is described below.

[0055] In the present invention, the mass ratio of the asphalt liquid to the pre-reacted mineral material is 6 to 8:100.

[0056] The semi-flexible room-temperature asphalt mixture obtained by the present invention has fast early strength formation, and the active diluent and the temperature range regulator cooperate to melt the asphalt, which can flexibly adjust the construction and workability of the mixture, and ensure the wrapping and bonding effect of the asphalt liquid and the aggregate, and the compaction is more dense, which improves the durability of the mixture. When the asphalt liquid is fully in contact with the pre-reacted mineral material, the stearic acid organic salt generated by the active diluent and the curing agent undergoes a polymerization reaction with the vulcanized rubber generated by the binder and the reactant to generate stearic acid organic salt and high molecular vulcanized silicone rubber, which can quickly improve the bonding strength and low-temperature flexibility of the mixture.

[0057] The present invention also provides a method for preparing the semi-flexible room temperature asphalt mixture described in the above technical solution, comprising the following steps:

[0058] The asphalt is heated to a molten state, an active diluent is added, and a first stirring is performed to obtain a mixed asphalt. The mixed asphalt is cooled to 60-70° C., a temperature range regulator, a binder, a accelerator and an anti-stripping agent are added, and a second stirring is performed to obtain an asphalt liquid;

[0059] The aggregate, polyester fiber, accelerator and curing agent are mixed to obtain a pre-reacted mineral material;

[0060] The asphalt liquid and the pre-reacted mineral material are mixed to obtain the semi-flexible room temperature asphalt mixture.

[0061] In the present invention, the heating temperature is preferably 130-140°C, more preferably 133-138°C.

[0062] In the present invention, the first stirring rate is preferably 200-300 r / min, more preferably 220-280 r / min. In the present invention, the second stirring rate is preferably 100-150 r / min, more preferably 120-140 r / min.

[0063] The present invention has no special requirements for the mixing method, and a mixing method commonly used in the art, such as stirring, may be used.

[0064] The present invention also provides the use of the semi-flexible room-temperature asphalt mixture prepared by the preparation method described in the above technical solution in road surface layers, ultra-thin wear layers and pothole repair materials.

[0065] In the present invention, the pavement surface layer preferably includes one or more of a pavement upper layer, a pavement middle layer and a pavement lower layer.

[0066] The present invention has no special requirements on the specific implementation methods of using the semi-flexible room temperature asphalt mixture in the pavement surface layer, ultra-thin wear layer and pothole repair material, and the implementation methods well known in the art can be adopted.

[0067] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described in conjunction with specific embodiments below. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Any modification, equivalent replacement, improvement, etc. made to the implementation methods of the present invention based on the technical essence and general principles of the present invention without creative work should be within the scope of protection of the present invention.

[0068] Example 1

[0069] The components of the asphalt liquid are: 56 parts of 70# Esso asphalt, 33 parts of coconut oleic acid, 1.5 parts of ethyl 3-ethoxypropionate, 0.5 parts of isobutyl acetate, 8 parts of terminal hydroxyl polysiloxane, 0.4 parts of tetrabutyl ketone oxime silane, and 0.6 parts of non-amine LURA anti-stripping agent.

[0070] The components constituting the pre-reaction ore are: 100 parts of SMA-13 ​​graded limestone, 0.3 parts of polyester fiber, 2 parts of sodium alkylbenzene sulfonate, and 0.15 parts of dibutyltin laurate.

[0071] Heat 70# Esso asphalt to 135℃, heat to molten state, take out and quickly add coconut oleic acid, stir in a mixer at 250r / min until mixed evenly. When the mixture is cooled to 65℃, add 3-ethoxyethyl propionate, isobutyl acetate, terminal hydroxyl polysiloxane, tetrabutyl ketoxime silane and non-amine LURA anti-stripping agent, stir in a mixer at 120r / min until mixed evenly, and obtain asphalt liquid.

[0072] The SMA-13 ​​graded limestone, polyester fiber, sodium alkylbenzene sulfonate and dibutyltin laurate are uniformly mixed to obtain a pre-reaction ore material.

[0073] 7.2 parts of asphalt liquid and 100 parts of pre-reacted mineral aggregate were uniformly mixed to obtain SMA-13 ​​semi-flexible room temperature asphalt mixture.

[0074] Example 2

[0075] The components of the asphalt liquid are: 70 parts of 70# Esso asphalt, 20 parts of olive oil acid, 1.3 parts of ethyl 3-ethoxypropionate, 0.7 parts of isobutyl acetate, 7 parts of terminal hydroxyl polysiloxane, 0.5 parts of tetrabutyl ketone oxime silane, and 0.5 parts of non-amine LURA anti-stripping agent.

[0076] The components constituting the pre-reaction ore are: 100 parts of AC-20 graded diabase, 0.2 parts of polyester fiber, 3 parts of sodium alkylbenzene sulfonate, and 0.1 parts of dibutyltin diacetate.

[0077] The preparation method of the asphalt liquid and the preparation method of the pre-reaction mineral material are the same as those in Example 1.

[0078] Fully mix 7 parts of asphalt liquid with 100 parts of pre-reacted mineral aggregate to obtain AC-20 semi-flexible room temperature asphalt mixture.

[0079] Example 3

[0080] The components of the asphalt liquid are: 65 parts of 70# Esso asphalt, 27 parts of perilla seed oil acid, 2 parts of ethyl 3-ethoxypropionate, 1 part of isobutyl acetate, 4 parts of terminal hydroxyl polysiloxane, 0.4 parts of tetrabutyl ketone oxime silane, and 0.6 parts of non-amine LURA anti-stripping agent.

[0081] The components constituting the pre-reaction ore are: 100 parts of ATB-25 graded basalt, 0.3 parts of polyester fiber, 3 parts of sodium alkylbenzene sulfonate, and 0.1 parts of dibutyltin diacetate.

[0082] The preparation method of the asphalt liquid and the preparation method of the pre-reaction mineral material are the same as those in Example 1.

[0083] ATB-25 semi-flexible room temperature asphalt mixture is obtained by fully mixing 6.5 parts of asphalt liquid with 100 parts of pre-reacted mineral aggregate.

[0084] Example 4

[0085] The components of the asphalt liquid are: 56 parts of 70# Esso asphalt, 30 parts of coconut oleic acid, 3 parts of ethyl 3-ethoxypropionate, 1 part of isobutyl acetate, 9 parts of terminal hydroxyl polysiloxane, 0.4 parts of tetrabutyl ketone oxime silane, and 0.6 parts of non-amine LURA anti-stripping agent.

[0086] The components constituting the pre-reaction ore are: 100 parts of AC-10 graded basalt, 0.3 parts of polyester fiber, 1.5 parts of sodium alkylbenzene sulfonate, and 0.15 parts of dibutyltin diacetate.

[0087] The preparation method of the asphalt liquid and the preparation method of the pre-reaction mineral material are the same as those in Example 1.

[0088] Fully mix 7.5 parts of asphalt liquid with 100 parts of pre-reacted mineral aggregate to obtain AC-10 semi-flexible room temperature asphalt mixture.

[0089] Example 5

[0090] The components of the asphalt liquid are: 56 parts of 70# Esso asphalt, 32 parts of perilla seed oil acid, 4.5 parts of ethyl 3-ethoxypropionate, 1.5 parts of isobutyl acetate, 5 parts of terminal hydroxyl polysiloxane, 0.5 parts of tetrabutyl ketone oxime silane, and 0.5 parts of non-amine LURA anti-stripping agent.

[0091] The components constituting the pre-reaction ore are: 100 parts of LB-10 graded basalt, 0.3 parts of polyester fiber, 1.5 parts of sodium alkylbenzene sulfonate, and 0.15 parts of dibutyltin diacetate.

[0092] The preparation method of the asphalt liquid and the preparation method of the pre-reaction mineral material are the same as those in Example 1.

[0093] LB-10 semi-flexible room temperature asphalt mixture was obtained by fully mixing 7.5 parts of asphalt liquid with 100 parts of pre-reacted mineral aggregate.

[0094] Example 6

[0095] The components of the asphalt liquid are: 70 parts of 70# Esso asphalt, 23 parts of perilla seed oil acid, 0.5 parts of ethyl 3-ethoxypropionate, 0.5 parts of isobutyl acetate, 5 parts of terminal hydroxyl polysiloxane, 0.5 parts of tetrabutyl ketone oxime silane, and 0.5 parts of non-amine LURA anti-stripping agent.

[0096] The components constituting the pre-reaction ore are: 100 parts of LB-10 graded basalt, 0.3 parts of polyester fiber, 1.5 parts of sodium alkylbenzene sulfonate, and 0.15 parts of dibutyltin diacetate.

[0097] The preparation method of the asphalt liquid and the preparation method of the pre-reaction mineral material are the same as those in Example 1.

[0098] LB-10 semi-flexible room temperature asphalt mixture was obtained by fully mixing 7.5 parts of asphalt liquid with 100 parts of pre-reacted mineral aggregate.

[0099] Example 7

[0100] The components of the asphalt liquid are: 68 parts of 70# Esso asphalt, 25 parts of coconut oleic acid, 0.66 parts of ethyl 3-ethoxypropionate, 0.33 parts of isobutyl acetate, 5 parts of terminal hydroxyl polysiloxane, 0.5 parts of tetrabutyl ketone oxime silane, and 0.5 parts of non-amine LURA anti-stripping agent.

[0101] The components constituting the pre-reaction ore are: 100 parts of AC-13 graded diabase, 0.2 parts of polyester fiber, 2 parts of sodium alkylbenzene sulfonate, and 0.1 parts of dibutyltin diacetate.

[0102] The preparation method of the asphalt liquid and the preparation method of the pre-reaction mineral material are the same as those in Example 1.

[0103] Fully mix 7.2 parts of asphalt liquid with 100 parts of pre-reacted mineral aggregate to obtain AC-13 semi-flexible room temperature asphalt mixture.

[0104] Example 8

[0105] The components of the asphalt liquid are: 70 parts of 70# Esso asphalt, 20 parts of coconut oleic acid, 0.5 parts of ethyl 3-ethoxypropionate, 0.5 parts of isobutyl acetate, 8 parts of terminal hydroxyl polysiloxane, 0.4 parts of tetrabutyl ketone oxime silane, and 0.6 parts of non-amine LURA anti-stripping agent.

[0106] The components constituting the pre-reaction ore are: 100 parts of AC-16 graded diabase, 0.3 parts of polyester fiber, 3 parts of sodium alkylbenzene sulfonate, and 0.15 parts of dibutyltin diacetate.

[0107] The preparation method of the asphalt liquid and the preparation method of the pre-reaction mineral material are the same as those in Example 1.

[0108] Fully mix 7.2 parts of asphalt liquid with 100 parts of pre-reacted mineral aggregate to obtain AC-16 semi-flexible room temperature asphalt mixture.

[0109] The room temperature asphalt mixtures prepared in Examples 1 to 8 were tested according to the current Technical Specifications for Highway Asphalt Pavement Construction JTGF40-2004, and the test results are shown in Table 2.

[0110] Table 2 Related test results of normal temperature asphalt mixtures prepared in Examples 1 to 8

[0111]

[0112]

[0113] From the test data in Table 2, it can be seen that the performance of the semi-flexible room temperature asphalt mixtures of Examples 1 to 8 exceeds the technical requirements of the current "Technical Specifications for Highway Asphalt Pavement Construction" JTG F40-2004 for modified asphalt mixtures. Specifically, the performance of the room temperature asphalt mixtures of Examples 1 and 4 is relatively close to that of the PG82 mixture; from the test results of Examples 1 to 4, it can be seen that the high-performance binders and active diluents with different dosages affect the strength formation time, molding strength, high and low temperature resistance and water and fatigue resistance of the mixture, and achieve the corresponding performance conversion from ordinary asphalt mixture to high-viscosity asphalt mixture, and are suitable for different scenarios; from Examples 5 to 8, the dosage of active diluent and temperature range regulator has a greater impact on the Brookfield viscosity of the asphalt liquid, and the semi-flexible wide temperature range room temperature asphalt mixture can meet the construction and workability under an ultra-wide temperature range of -20 to 50 ° C.

[0114] The low temperature Brookfield viscosity performance of the asphalt liquids prepared in Examples 1 to 8 was tested at different temperature ranges. The results are shown in Figure 1 . Figure 1 The figure shows the fluidity of the asphalt liquid obtained at different temperatures. When mixing asphalt, the Brookfield viscosity below 3Pa·s can ensure the mixing workability and uniform mixing. Asphalt is a temperature-sensitive mixture. As the temperature rises, its Brookfield viscosity will decrease and its fluidity will be better.

[0115] In summary, the wide temperature range asphalt liquid described in the present invention has extremely high adhesion performance and high construction tolerance. The semi-flexible wide temperature range room temperature asphalt mixture is based on the dual curing reaction of high-performance adhesives and active diluents, generating organic polymerization products such as stearic acid organic salts and high molecular weight vulcanized silicone rubber. With the addition of fibers, the mixture can form a certain strength in a short time, showing excellent high temperature rutting resistance and excellent flexibility. It has outstanding anti-stripping and anti-fatigue performance, is durable, and can be used in application scenarios such as road surface, ultra-thin wear layer and pothole repair materials.

[0116] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A semi-flexible room temperature asphalt mixture, characterized in that: It comprises asphalt liquid and pre-reacted mineral material; the mass ratio of the asphalt liquid to the pre-reacted mineral material is 6 to 8:100; In terms of parts by mass, the asphalt liquid includes 56 to 70 parts of asphalt, 1 to 6 parts of temperature range regulator, 20 to 33 parts of active diluent, 3 to 9 parts of adhesive, 0.4 to 0.5 parts of reactant, and 0.5 to 0.6 parts of anti-stripping agent; Calculated by weight, the pre-reaction mineral material includes 100 parts of aggregate, 0.1 to 0.3 parts of polyester fiber, 2 to 3 parts of curing agent, and 0.05 to 0.15 parts of accelerator.

2. The semi-flexible room temperature asphalt mixture according to claim 1, characterized in that: The temperature range regulator is one or more of ethyl 3-ethoxypropionate, n-butanol, n-hexadecyl alcohol and isobutyl acetate.

3. The semi-flexible room temperature asphalt mixture according to claim 2, characterized in that: When the temperature range regulator is ethyl 3-ethoxypropionate and isobutyl acetate, the mass ratio of ethyl 3-ethoxypropionate to isobutyl acetate is 3 to 1:

1.

4. The semi-flexible room temperature asphalt mixture according to claim 1, characterized in that: The active diluent is one or more of perilla seed oleic acid, coconut oleic acid and olive oil oleic acid; The adhesive is hydroxyl-terminated polysiloxane.

5. The semi-flexible room temperature asphalt mixture according to claim 1, characterized in that: The reactant is one or more of tetrabutyl ketoxime silane, methyltriethoxysilane and vinyltriethoxysilane; The anti-stripping agent is p-phenylenediamine ET-2500 or non-amine LURA.

6. The semi-flexible room temperature asphalt mixture according to claim 1, characterized in that: The curing agent is one or more of amino acid, sodium alkylbenzene sulfonate and sodium bicarbonate; The accelerator is dibutyltin laurate or dibutyltin diacetate.

7. The semi-flexible room temperature asphalt mixture according to claim 1, characterized in that: The polyester fiber has a nominal length of 1 to 5 mm, a monofilament diameter of 8 to 12 μm, and an elastic modulus of more than 10×10 3 MPa.

8. The method for preparing a semi-flexible room temperature asphalt mixture according to any one of claims 1 to 7, characterized in that: The steps include: The asphalt is heated to a molten state, an active diluent is added, and a first stirring is performed to obtain a mixed asphalt. The mixed asphalt is cooled to 60-70° C., a temperature range regulator, a binder, a accelerator and an anti-stripping agent are added, and a second stirring is performed to obtain an asphalt liquid; The aggregate, polyester fiber, accelerator and curing agent are mixed to obtain a pre-reacted mineral material; The asphalt liquid and the pre-reacted mineral material are mixed to obtain the semi-flexible room temperature asphalt mixture.

9. The preparation method according to claim 8, characterized in that: The heating temperature is 130-140°C.

10. Use of the semi-flexible room temperature asphalt mixture according to any one of claims 1 to 7 or the semi-flexible room temperature asphalt mixture prepared by the preparation method according to any one of claims 8 to 9 in road surface layers, ultra-thin wear layers and pothole repair materials.

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