CN112745063A - Flame-retardant warm-mix capsule self-healing asphalt concrete and preparation method thereof - Google Patents
Flame-retardant warm-mix capsule self-healing asphalt concrete and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a flame-retardant warm-mix capsule self-healing asphalt concrete and a preparation method thereof. The preparation method comprises the following steps: mixing the layered double hydroxide and the organic viscosity reducer to obtain a flame-retardant warm mixing agent; mixing a formaldehyde solution and urea, adjusting the pH value to 8-9, adding graphene, stirring for reaction, and adding water to obtain a prepolymer solution; mixing the emulsifier solution with n-octanol and an asphalt regenerant to obtain a core material emulsion; dropwise adding the prepolymer solution into the core material emulsion, adding ammonium chloride and resorcinol, adjusting the pH to 2-3, and curing to obtain a healing capsule; the steel wool fiber and the aggregate are pre-mixed, then the modified asphalt, the flame-retardant warm mixing agent and the self-healing capsule are added for stirring, then the mineral powder is added for stirring, and the asphalt concrete is obtained through the molding process. According to the invention, the synergistic effect of the layered double hydroxide, the organic viscosity reducer and the self-healing capsule can be fully exerted, and the flame retardant property, the warm-mixing property and the self-healing property of the obtained asphalt concrete are obviously improved.
Description
Technical Field
The invention relates to the technical field of asphalt concrete, in particular to flame-retardant warm-mixing capsule self-healing asphalt concrete and a preparation method thereof.
Background
Asphalt pavement refers to various types of pavement that are made by incorporating into mineral materials a road asphalt material. The asphalt binder improves the capability of the paving aggregate to resist damage of traveling vehicles and natural factors to the pavement, and enables the pavement to be smooth, less in dust, impermeable and durable. Accordingly, asphalt pavement is one of the most widely used high-grade pavements in road construction.
However, asphalt pavements also suffer from the following disadvantages:
1. asphalt belongs to flammable substances, and the use of the asphalt pavement undoubtedly increases the danger of fire in the tunnel, particularly in the closed tunnel environment;
2. in the process of asphalt pavement construction, a large amount of asphalt smoke is generated by adopting the hot-mix asphalt mixture, so that hidden dangers are caused to the health and safety of constructors, and the mechanical equipment can be stopped and has a fault due to the fact that oxygen in the air is diluted by the large amount of smoke, so that the construction progress is influenced;
3. the tunnel is the relatively humid environment, and the water damage resistance performance requirement to the road surface is higher, and huge traffic has increased the road surface later stage maintenance degree of difficulty in addition.
Therefore, an asphalt concrete with flame retardant, warm mixing and self-healing properties is urgently needed on the premise of ensuring the performance of an asphalt concrete road.
Disclosure of Invention
In view of the above, there is a need to provide a flame-retardant warm-mix capsule self-healing asphalt concrete and a preparation method thereof, so as to solve the technical problem in the prior art that the asphalt concrete has poor flame retardant performance, warm-mix performance and self-healing performance.
The invention provides a preparation method of a flame-retardant warm-mix capsule self-healing asphalt concrete, which comprises the following steps of raw material components in parts by weight:
uniformly mixing 3-5 parts of layered double hydroxide and 1-2 parts of organic viscosity reducer to obtain a flame-retardant warm mixing agent;
mixing and stirring a 37 wt% formaldehyde solution and urea until the urea is completely dissolved, adjusting the pH value to 8-9, adding graphene, slowly heating to 60-70 ℃, stirring for reaction for 1-2 hours, and adding water for dilution to obtain a prepolymer solution; dissolving an emulsifier in water, adding n-octanol and an asphalt regenerant, and stirring for 1-2 hours to obtain a core material emulsion; dropwise adding the prepolymer solution into the core material emulsion, then adding ammonium chloride and resorcinol, carrying out the whole reaction at 60-70 ℃, adjusting the pH to 2-3, continuously curing for 2-3 h after the capsule is formed, and filtering, washing and drying after the reaction is finished to obtain a self-healing capsule; the dropping rate of the prepolymer solution is 80-120 drops/min, and the stirring rate is 80-100 revolutions/min;
4-6 parts of steel wool fibers and 1800-2200 parts of aggregates preheated to 140-160 ℃ are pre-mixed, then 100 parts of modified asphalt preheated to 140-160 ℃ and the flame-retardant warm mixing agent are added, 8-10 parts of the self-healing capsules are stirred for 85-95 seconds, 170-230 parts of mineral powder are added, stirring is carried out for 85-95 seconds, and then the flame-retardant warm-mixing induction heating self-healing asphalt concrete is obtained through a forming process.
The second aspect of the invention provides a flame-retardant warm-mix capsule self-healing asphalt concrete, which is obtained by the preparation method of the flame-retardant warm-mix capsule self-healing asphalt concrete provided by the first aspect of the invention.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the layered double hydroxide, the organic viscosity reducer and the self-healing capsule are added into the asphalt concrete, and the addition amount is strictly controlled, so that the synergistic effect of all the components can be fully exerted, and the flame retardant property, the warm-mixing property and the self-healing property of the obtained asphalt concrete are obviously improved; the preparation method is simple, mild in condition and easy to implement.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a preparation method of a flame-retardant warm-mix capsule self-healing asphalt concrete, which comprises the following steps of raw material components in parts by weight:
s1: uniformly mixing 3-5 parts of layered double hydroxide and 1-2 parts of organic viscosity reducer to obtain a flame-retardant warm mixing agent;
s2: mixing and stirring a 37 wt% formaldehyde solution and urea until the urea is completely dissolved, adjusting the pH value to 8-9, adding graphene, slowly heating to 60-70 ℃, stirring for reaction for 1-2 hours, and adding water for dilution to obtain a prepolymer solution; dissolving an emulsifier in water, adding n-octanol and an asphalt regenerant, and stirring for 1-2 hours to obtain a core material emulsion; dropwise adding the prepolymer solution into the core material emulsion, then adding ammonium chloride and resorcinol, carrying out the whole reaction at 60-70 ℃, adjusting the pH to 2-3, continuously curing for 2-3 h after the capsule is formed, and filtering, washing and drying after the reaction is finished to obtain a self-healing capsule; the dropping rate of the prepolymer solution is 80-120 drops/min, and the stirring rate is 80-100 revolutions/min. In the invention, the thickness of the capsule shell is favorably reduced by adopting higher control dripping speed and stirring speed. However, the dripping speed and the stirring speed are not too high or too low, and too high causes the capsule shell to be too thin, the capsule yield is low, and the capsule shell is easy to rupture in advance in the mixing process, so that the later self-healing effect is influenced; the capsule shell is thicker due to over-low temperature, the later self-healing process is not easy to break, and the self-healing effect is reduced.
S3: 4-6 parts of steel wool fibers and 1800-2200 parts of aggregates preheated to 140-160 ℃ are pre-mixed, then 100 parts of modified asphalt preheated to 140-160 ℃, the flame-retardant warm mixing agent and 8-10 parts of self-healing capsules are added and stirred for 85-95 seconds, 170-230 parts of mineral powder are added and stirred for 85-95 seconds, and then the flame-retardant warm-mixing induction heating self-healing asphalt concrete is obtained through a forming process.
According to the invention, the graphene is added into the self-healing capsule, so that the toughness of the capsule can be improved, and the self-healing capsule is prevented from being broken in advance in the mixing process to influence the subsequent self-healing effect on the premise of reducing the thickness of the capsule shell. However, the doping amount of the graphene is not too much or too little, so that the capsule shell is remarkably toughened and not easily broken, and the later self-healing effect is reduced; less, the toughening effect on the capsule shell is poor, the capsule is broken in the mixing process, and the later self-healing effect is reduced. Meanwhile, due to the excellent heat-conducting property of the graphene, the urea-formaldehyde resin can rapidly absorb and melt in the self-healing process, so that the self-healing effect is further improved. In addition, the graphene can be interwoven into a network structure in the residual carbon layer, so that the compactness and stability of the residual carbon layer are improved, and the flame retardant property of the asphalt concrete is further improved.
In the self-healing process, the urea-formaldehyde resin is aged synchronously with the asphalt, so that the damage temperature of the capsule shell is reduced; when the induction heating self-healing process is carried out on the asphalt pavement, due to the synergistic effect of the thinner capsule shell and the graphene, the thermal conduction rate is increased, the capsule shell can be accelerated to break, the healing agent is released to repair the asphalt, and the heating temperature can be obviously reduced.
The invention fully exerts the synergistic performance of each component by strictly controlling the mixing amount of the components, so that the obtained asphalt concrete has excellent flame retardant property, warm mixing property and self-healing effect.
In this embodiment, the layered double hydroxide is a layered magnesium-aluminum double hydroxide, and the ratio of magnesium to aluminum is 2: 1, the average particle size is 5-10 um.
In this embodiment, the organic viscosity reducer is C15～C30The aliphatic hydrocarbon compound of (1). The invention is not limited to specific carbon chain lengths, and the art can appreciate thatThe skilled person can make the choice according to the actual situation. For example, the organic viscosity reducer can be selected from EC-120 of Shenzhen Hichuan new material science and technology Limited.
In the present embodiment, the graphene has an average thickness of less than 3.0nm and a sheet size of 1 to 2 μm.
In this embodiment, the mass ratio of urea to the formaldehyde solution to the graphene is 1: (1.703-2.622): (0.05-0.1); and in the process of adding water for dilution to obtain the prepolymer, the adding amount of the water is 2-5 times of that of the formaldehyde solution.
In the present embodiment, in the core material emulsion, the emulsifier is one or more of OP-10 and Span 80; the asphalt regenerant is one or more of sunflower seed oil and liquid paraffin; water and emulsifier, n-octanol: the mass ratio of the asphalt regenerant is 100: (4-6): (0.05-0.06): (8-11).
In the present embodiment, the mass ratio of the prepolymer solution to the core material emulsion is (0.25 to 0.75):1, and further (0.4 to 0.7): 1; the mass ratio of the asphalt regenerant to the ammonium chloride to the resorcinol is 10: (0.4-0.6): (0.4-0.6).
The acid and alkali used in the process of adjusting the pH in the step (2) are not limited, and the pH value of the system can reach the range, for example, in the process of adjusting the pH to 8-9, the alkali selected can be one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, ammonia water and ethanolamine; in the process of adjusting the pH to 2-3, the selected acid can be one or more of hydrochloric acid, nitric acid, sulfuric acid, citric acid and acetic acid.
In the present embodiment, the steel wool fibers have a width of 0.0360 to 0.0598 mm. For example, the steel wool fibers are selected from Texas Square Steel wool fibers, Inc., with the specific model number Q1-80.
In the present embodiment, the aggregate is one or two of basalt and limestone; further, the aggregate grading is any one or more of AC, SMA and OGFC.
In the present embodiment, the modified asphalt is SBS modified asphalt.
In this embodiment, the ore powder is limestone ore powder.
The second aspect of the invention provides a flame-retardant warm-mix capsule self-healing asphalt concrete, which is obtained by the preparation method of the flame-retardant warm-mix capsule self-healing asphalt concrete provided by the first aspect of the invention.
For avoiding redundancy, the following materials in the examples and comparative examples are summarized as follows:
layered double metal oxide: LDHs of Beijing Taike Laier chemical Co., Ltd, Mg/Al ratio of 2: 1;
organic viscosity reducer: an organic viscosity reducer EC-120 of Shenzhen Hichuan new material science and technology Limited;
steel wool fiber: texas Square steel cotton fiber Co., Ltd, the specific model is Q1-80;
aggregate: the coarse aggregate is basalt macadam of Ulian county new source basalt mining company Limited; the fine aggregate is machine-made sand of Huikang sand stone processing company Limited in Chicheng county; SMA-13 is selected as aggregate grading;
modified asphalt: SBS (I-C) modified asphalt of petroleum fuel asphalt Co., Ltd, Qinhuang island;
mineral powder: limestone mineral powder of Yangyuan Longyang calcium industry, Limited liability company.
Example 1
(1) Uniformly mixing 4 parts of layered double hydroxide and 1.5 parts of organic viscosity reducer to obtain a flame-retardant warm mixing agent;
(2) mixing and stirring 1.125 parts of 37 wt% formaldehyde solution and 0.5 part of urea until the urea is completely dissolved, dropwise adding triethanolamine to adjust the pH value to 8-9, adding 0.04 part of graphene, slowly heating to 65 ℃, stirring to react for 1.5h, and adding 4 parts of water to dilute to obtain a prepolymer solution of a stable homogeneous system; dissolving 0.45 part of OP-10 in 9 parts of water, adding 0.0045 part of n-octanol and 0.9 part of liquid paraffin, and stirring for 1.5 hours to obtain a core material emulsion; dropwise adding the prepolymer solution into the core material emulsion, then adding 0.045 part of ammonium chloride and 0.045 part of resorcinol, carrying out the whole reaction at 65 ℃, adjusting the pH to 2-3 by using citric acid, continuously curing for 2.5h after the capsule is formed, and filtering, washing and drying after the reaction is finished to obtain a self-healing capsule; the dropping rate of the prepolymer solution is 100 drops/min, and the stirring rate is 90 revolutions/min;
(3) 5 parts of steel wool fibers and 2000 parts of aggregate which is preheated to 150 ℃ are premixed, then 100 parts of modified asphalt which is preheated to 150 ℃, 5.5 parts of flame-retardant warm-mixing agent and 9 parts of self-healing capsule are added and stirred for 90s, then 200 parts of mineral powder are added and stirred for 90s, and then the flame-retardant warm-mixing induction heating self-healing asphalt concrete is obtained through a molding process.
Example 2
(1) Uniformly mixing 3 parts of layered double hydroxide and 2 parts of organic viscosity reducer to obtain a flame-retardant warm mixing agent;
(2) mixing and stirring 1.108 parts of 37 wt% formaldehyde solution and 0.65 part of urea until the urea is completely dissolved, dropwise adding triethanolamine to adjust the pH value to 8-9, adding 0.065 part of graphene, slowly heating to 60 ℃, stirring for reaction for 2 hours, and adding 5 parts of water to dilute to obtain a prepolymer solution of a stable homogeneous system; dissolving 0.36 part of OP-10 in 9 parts of water, adding 0.0045 part of n-octanol and 0.72 part of liquid paraffin, and stirring for 1h to obtain a core material emulsion; dropwise adding the prepolymer solution into the core material emulsion, then adding 0.043 part of ammonium chloride and 0.043 part of resorcinol, carrying out the whole reaction at 60 ℃, adjusting the pH to 2-3 by using citric acid, continuously curing for 3 hours after the capsule is formed, and filtering, washing and drying after the reaction is finished to obtain a self-healing capsule; the dropping rate of the prepolymer solution is 120 drops/min, and the stirring rate is 80 revolutions/min;
(3) 4 parts of steel wool fibers and 1800 parts of aggregates preheated to 140 ℃ are premixed, then 100 parts of modified asphalt preheated to 140 ℃, 5 parts of flame-retardant warm-mixing agent and 8 parts of self-healing capsules are added and stirred for 85 seconds, 170 parts of mineral powder is added and stirred for 85 seconds, and the flame-retardant warm-mixing induction heating self-healing asphalt concrete is obtained through a molding process.
Example 3
(1) Uniformly mixing 5 parts of layered double hydroxide and 1 part of organic viscosity reducer to obtain a flame-retardant warm mixing agent;
(2) mixing and stirring 1.255 parts of 37% wt formaldehyde solution and 0.48 part of urea until the urea is completely dissolved, dropwise adding triethanolamine to adjust the pH value to 8-9, adding 0.024 part of graphene, slowly heating to 70 ℃, stirring for reaction for 1h, and adding 3.5 parts of water to dilute to obtain a prepolymer solution of a stable homogeneous system; dissolving 0.6 part of OP-10 in 10 parts of water, adding 0.006 part of n-octanol and 1.1 part of liquid paraffin, and stirring for 1.5 hours to obtain a core material emulsion; dropwise adding the prepolymer solution into the core material emulsion, then adding 0.044 part of ammonium chloride and 0.044 part of resorcinol, carrying out the whole reaction at 70 ℃, adjusting the pH to 2-3 by using citric acid, continuously curing for 2 hours after the capsule is formed, and filtering, washing and drying after the reaction is finished to obtain a self-healing capsule; the dropping rate of the prepolymer solution is 80 drops/min, and the stirring rate is 100 revolutions/min;
(3) 6 parts of steel wool fibers and 2200 parts of aggregate which is preheated to 160 ℃ are premixed, then 100 parts of modified asphalt which is preheated to 160 ℃, 6 parts of flame-retardant warm-mixing agent and 10 parts of self-healing capsule are added and stirred for 95 seconds, then 230 parts of mineral powder are added and stirred for 95 seconds, and the flame-retardant warm-mixing induction heating self-healing asphalt concrete is obtained through a molding process.
Comparative example 1
The only difference compared to example 1 is that no graphene was added in step (2) of comparative example 1.
Comparative example 2
The only difference compared to example 1 is that 0.1 parts of graphene was added in step (2) of comparative example 1.
Comparative example 3
The only difference from example 1 was that the addition rate of the prepolymer solution in step (2) of comparative example 3 was 50 drops/min and the stirring rate was 50 rpm.
Comparative example 4
The only difference from example 1 was that the addition rate of the prepolymer solution in step (2) of comparative example 3 was 150 drops/min and the stirring rate was 120 revolutions/min.
Blank control group
Heating 2000 parts of aggregate to 180 ℃, adding 100 parts of modified asphalt preheated to 160 ℃, stirring for 90s, adding 200 parts of mineral powder, stirring for 90s, and performing a molding process to obtain the asphalt concrete.
Test group 1
The asphalt concretes of the above examples 1 to 3, comparative examples 1 to 4 and blank control were cut into concrete blocks of 70mm x 10mm, and the concrete blocks were put into cone calorimeter tests, respectively, and the intensity of thermal radiation during the tests was 50kW/m2The test results are shown in Table 1.
TABLE 1 Cone calorimeter testing of asphalt concrete
Test group 2
The asphalt concretes of the examples 1 to 3, the comparative examples 1 to 4 and the blank control group are respectively cut into concrete blocks of 70mm by 10mm, the self-healing test adopts a fracture strength recovery test, and the specific test steps are as follows: (1) placing the test piece in a constant temperature test box at-10 ℃ for heat preservation for 4h, and then carrying out a three-point bending failure test on the test piece to obtain an initial failure load F0(ii) a (2) Placing the fractured test piece under a coil at a set distance and heating until the surface temperature of the test piece reaches a target temperature; (3) after the heating time is 120s, stopping heating, and placing the test piece at room temperature for cooling; (4) repeating the step (1) to obtain the destructive load F after induction heating healing1. Calculating the failure load ratio of the bending tests in the two times to obtain the strength recovery rate of the test piece; recording the crack widths of the test pieces damaged twice, wherein the crack widths are respectively L0And L1And calculating the width ratio of the test piece crack of the two bending tests before and after to obtain the crack healing rate of the test piece.
TABLE 2 self-healing test of asphalt concrete
Test group 3
According to JTGE20-2011 test procedures for road engineering asphalt and asphalt mixtures, the asphalt mixtures of the examples 1-3, the comparative examples 1-4 and the blank control group are respectively subjected to performance tests, and the test results are shown in Table 3.
TABLE 3 road Performance test of asphalt concrete
As can be seen from tables 1 to 3, compared with comparative examples 1 to 4 and a blank control group, examples 1 to 3 of the present invention all have better flame retardant property, self-healing property and pavement property, which indicates that adding layered double metal hydroxide, organic viscosity reducer, steel wool fiber and self-healing capsule into asphalt concrete can fully exert the synergistic effect of each component, and significantly improve the flame retardant property, warm-mixing property, self-healing property and pavement property of the modified asphalt concrete; and simultaneously, the comprehensive performance of the obtained asphalt concrete can be further improved by strictly controlling the mixing amount of the components and the process conditions.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The preparation method of the flame-retardant warm-mixed capsule self-healing asphalt concrete is characterized by comprising the following steps of:
uniformly mixing 3-5 parts of layered double hydroxide and 1-2 parts of organic viscosity reducer to obtain a flame-retardant warm mixing agent;
mixing and stirring a 37 wt% formaldehyde solution and urea until the urea is completely dissolved, adjusting the pH value to 8-9, adding graphene, slowly heating to 60-70 ℃, stirring for reaction for 1-2 hours, and adding water for dilution to obtain a prepolymer solution; dissolving an emulsifier in water, adding n-octanol and an asphalt regenerant, and stirring for 1-2 hours to obtain a core material emulsion; dropwise adding the prepolymer solution into the core material emulsion, then adding ammonium chloride and resorcinol, carrying out the whole reaction at 60-70 ℃, adjusting the pH to 2-3, continuously curing for 2-3 h after the capsule is formed, and filtering, washing and drying after the reaction is finished to obtain a self-healing capsule; the dropping rate of the prepolymer solution is 80-120 drops/min, and the stirring rate is 80-100 revolutions/min;
4-6 parts of steel wool fibers and 1800-2200 parts of aggregates preheated to 140-160 ℃ are premixed, then 100 parts of modified asphalt preheated to 140-160 ℃ and the flame-retardant warm mixing agent are added, 8-10 parts of the self-healing capsules are stirred for 85-95 seconds, 170-230 parts of mineral powder are added and stirred for 85-95 seconds, and then the flame-retardant warm-mixing induction heating self-healing asphalt concrete is obtained through a forming process.
2. The preparation method of the flame-retardant warm-mix capsule self-healing asphalt concrete according to claim 1, wherein the layered double hydroxide is a layered magnesium aluminum double hydroxide, and the ratio of magnesium to aluminum is 2: 1, the average particle size is 5-10 um.
3. The method for preparing the flame-retardant warm-mix capsule self-healing asphalt concrete according to claim 1, wherein the organic viscosity reducer is C15～C30The aliphatic hydrocarbon compound of (1).
4. The preparation method of the flame-retardant warm-mix capsule self-healing asphalt concrete according to claim 1, wherein the average graphene thickness is less than 3.0nm, and the lamella size is 1-2 μm.
5. The preparation method of the flame-retardant warm-mix capsule self-healing asphalt concrete according to claim 1, wherein the mass ratio of urea to formaldehyde solution to graphene is 1: (1.703-2.622): (0.05-0.1); in the process of adding water to dilute the prepolymer, the addition amount of water is 2-5 times of that of the formaldehyde solution.
6. The method for preparing the flame-retardant warm mix capsule self-healing asphalt concrete according to claim 1, wherein in the core material emulsion, the emulsifier is one or more of OP-10 or Span80, and the asphalt regenerant is one or more of sunflower seed oil and liquid paraffin; water and emulsifier, n-octanol: the mass ratio of the asphalt regenerant is 100: (4-6): (0.05-0.06): (8-11).
7. The preparation method of the flame-retardant warm-mixed capsule self-healing asphalt concrete according to claim 1, wherein the mass ratio of the prepolymer solution to the core material emulsion is (0.25-0.75): 1; the mass ratio of the asphalt regenerant to the ammonium chloride to the resorcinol is 10: (0.4-0.6): (0.4-0.6).
8. The preparation method of the flame-retardant warm-mixed capsule self-healing asphalt concrete according to claim 1, wherein the width of the steel wool fibers is 0.0360-0.0598 mm, and the aggregate is one or two of basalt and limestone; the modified asphalt is SBS modified asphalt; the mineral powder is limestone mineral powder.
9. The preparation method of the flame-retardant warm-mix capsule self-healing asphalt concrete according to claim 1, wherein the aggregate grading is any one or more of AC, SMA and OGFC.
10. The flame-retardant warm-mix capsule self-healing asphalt concrete is characterized by being prepared by the preparation method of the flame-retardant warm-mix capsule self-healing asphalt concrete according to any one of claims 1 to 9.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101746996A (en) * | 2008-12-13 | 2010-06-23 | 深圳市海川实业股份有限公司 | Warm mixing and antiflaming asphalt mixture and preparation method thereof |
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