CN113604060A - Flame-retardant warm-mix modified asphalt and preparation method and application thereof - Google Patents
Flame-retardant warm-mix modified asphalt and preparation method and application thereof Download PDFInfo
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- CN113604060A CN113604060A CN202011581563.6A CN202011581563A CN113604060A CN 113604060 A CN113604060 A CN 113604060A CN 202011581563 A CN202011581563 A CN 202011581563A CN 113604060 A CN113604060 A CN 113604060A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, 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
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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Abstract
The invention discloses a flame-retardant warm-mix modified asphalt and a preparation method and application thereof, and the flame-retardant warm-mix modified asphalt comprises the following components in parts by mass: 100 parts of modified asphalt; 3-8 parts of a warm mixing agent; 4-10 parts of a flame retardant; wherein the flame retardant comprises the following components in a mass ratio of (3-7): (0.5-2): (0.5-2) decabromodiphenylethane, antimony trioxide and aluminum hydroxide; the warm-mixing agent comprises artificial zeolite. The flame-retardant warm-mix modified asphalt provided by the invention can improve the warm-mix performance of asphalt through the artificial zeolite, and meanwhile, the artificial zeolite is matched with the flame retardant provided by the invention, so that the oxygen index of the asphalt can be synergistically improved, the ignition time of the asphalt is prolonged, and the combustion heat release rate and the CO release rate of the asphalt are reduced.
Description
Technical Field
The invention belongs to the field of asphalt concrete, and particularly relates to flame-retardant warm-mix modified asphalt and a preparation method and application thereof.
Background
The asphalt concrete pavement has the advantages of low noise, good anti-skid performance, easy maintenance, driving comfort and the like, and is widely applied to highway tunnels in China. However, asphalt itself is an organic mixture which is easy to burn, and when a fire breaks out in a tunnel, not only causes great economic loss but also endangers the life safety of passengers under the closed structure of the tunnel and the tendency of the fire to spread.
At present, the traditional hot Mix asphalt mixture HMA (Hot Mix asphalt) is adopted in the road construction process, the HMA has high requirement on temperature, asphalt and aggregate can be heated to high temperature in the production and construction processes, a large amount of energy is consumed, a large amount of waste gas and dust can be discharged in the production and construction processes, and the construction environment and the health of constructors are seriously influenced. And the tunnel is in the environment of relative humidity, and the water damage resistance performance requirement to the road surface is higher, adds huge traffic, has increased the road surface later stage maintenance degree of difficulty. Therefore, the asphalt concrete with the flame-retardant warm-mixing induction heating self-healing performance on the premise of ensuring the performance of the asphalt concrete pavement is yet to be developed so as to meet the requirements of green construction, safe operation and good durability of the tunnel pavement.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects and shortcomings in the background technology and provides flame-retardant warm mix modified asphalt and a preparation method and application thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the flame-retardant warm-mix modified asphalt comprises the following components in parts by mass:
100 portions of modified asphalt
3-8 parts of warm mixing agent
4-10 parts of flame retardant
Wherein the flame retardant comprises the following components in a mass ratio of (3-7): (0.5-2): (0.5-2) decabromodiphenylethane, antimony trioxide and aluminum hydroxide; the warm-mixing agent comprises artificial zeolite.
Preferably, the flame retardant consists of (3-7) by mass: (0.5-2): (0.5-2) decabromodiphenylethane, antimony trioxide and aluminum hydroxide; the warm-mixing agent is artificial zeolite.
Preferably, the artificial zeolite contains crystal water, and the mass fraction of the crystal water in the artificial zeolite is 15-25%, preferably 20-24%.
Preferably, the modified asphalt is SBS modified asphalt.
Preferably, the flame retardant is prepared from (4-6) by mass: (0.7-1.5): (0.7-1.5) decabromodiphenylethane, antimony trioxide and aluminum hydroxide.
Preferably, the addition amount of the flame retardant is 7 to 9 parts.
The invention also provides a preparation method of the flame-retardant warm-mix modified asphalt, which comprises the steps of heating the modified asphalt, adding the warm-mix agent and the flame retardant, and stirring to obtain the flame-retardant warm-mix modified asphalt.
In the preparation method, the modified asphalt is preferably heated to 140-160 ℃ and then the warm-mixing agent and the flame retardant are added.
According to the preparation method, preferably, after the warm-mix agent and the flame retardant are added, the mixture is stirred at a high speed, then stirred at a low speed and cooled to obtain the flame-retardant warm-mix modified asphalt; wherein the high-speed stirring speed is 4000-; the rotating speed of the low-speed stirring (for removing bubbles) is 400-600r/min, and the time of the low-speed stirring is 10-20 min.
In the preparation method, preferably, the warm-mixing agent is added firstly, and then the flame retardant is added.
In the preparation method, the materials are preferably stirred manually in the cooling process so as to prevent the segregation of the flame-retardant warm-mixed modified asphalt.
The invention also provides the flame-retardant warm-mix modified asphalt or the application of the preparation method in preparing asphalt concrete.
The artificial zeolite, also called synthetic zeolite, has the main component of sodium aluminosilicate, contains crystal water in the structure, and the chemical formula can be simply expressed as follows regardless of the molar ratio: na (Na)2O·Al2O3·SiO2·H2O。
The synthetic zeolite used in the present invention is in the form of powder, preferably 80 to 200 mesh, and is easily dispersed in the modified asphalt. In the experimental process, the synthetic zeolite powder can improve the high-temperature fluidity of the asphalt, simultaneously improve the oxygen index of the asphalt with a flame retardant, prolong the ignition time of the asphalt and reduce the combustion heat release rate and the CO release rate of the asphalt under certain conditions.
Compared with the prior art, the invention has the following advantages:
(1) the flame-retardant warm-mix modified asphalt provided by the invention can improve the warm-mix performance of asphalt through the artificial zeolite, and meanwhile, the artificial zeolite is matched with the flame retardant provided by the invention, so that the oxygen index of the asphalt can be synergistically improved, the ignition time of the asphalt is prolonged, and the combustion heat release rate and the CO release rate of the asphalt are reduced.
(2) The flame-retardant warm-mix modified asphalt disclosed by the invention is applied to asphalt concrete, and has a very good application prospect in flame retardance of asphalt pavements, particularly asphalt pavements in tunnels.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In the following examples and comparative examples, unless otherwise specified, each part in the formulation represents a part by mass of 10 g. In the data analysis, the percentage of the blending amount is calculated based on the modified asphalt, for example, the blending amount of the warm-mix agent in example 1 is 6%, and the blending amount of the flame retardant is 7%. Wherein the water content of the artificial zeolite powder is 20 wt% (mass fraction).
Experiments and comparison are carried out to show the synergistic flame-retardant effect of the artificial zeolite powder as a warm-mixing agent and a flame retardant in warm-mixing flame-retardant asphalt.
Example 1:
the flame-retardant warm-mix modified asphalt comprises 100 parts of SBS (I-C) modified asphalt, 6 parts of warm-mix agent artificial zeolite powder and 7 parts of flame retardant (decabromodiphenylethane, antimony trioxide and aluminum hydroxide in a mass ratio of 5: 1: 1).
The preparation method of the flame-retardant warm-mix modified asphalt comprises the following steps:
according to the formula amount, the SBS (I-C) modified asphalt is heated to 150 +/-5 ℃; then adding SBS (I-C) modified asphalt into a high shear mixing emulsifier for stirring, slowly adding warm-mixing agent and flame retardant (the adding sequence is artificial zeolite powder, decabromodiphenylethane, antimony trioxide and aluminum hydroxide in sequence) while stirring, then stirring for 30min at the rotating speed of 5000r/min, stirring for 15min at the stirring speed of 500r/min to remove bubbles, stopping heating for cooling, and manually stirring in the cooling process to prevent segregation, thus finally obtaining the warm-mixing modified asphalt.
Example 2:
the flame-retardant warm-mix modified asphalt comprises 100 parts of SBS (I-C) modified asphalt, 5 parts of warm-mix agent artificial zeolite powder and 7 parts of flame retardant (decabromodiphenylethane, antimony trioxide and aluminum hydroxide in a mass ratio of 5: 1: 1).
The preparation method is the same as example 1.
Example 3:
the flame-retardant warm-mix modified asphalt comprises 100 parts of SBS (I-C) modified asphalt, 7 parts of warm-mix agent artificial zeolite powder and 7 parts of flame retardant (decabromodiphenylethane, antimony trioxide and aluminum hydroxide in a mass ratio of 5: 1: 1).
The preparation method is the same as example 1.
Comparative example 1:
the formula of the warm-mix modified asphalt of the comparative example comprises 100 parts of SBS (I-C) modified asphalt and 5 parts of warm-mix agent artificial zeolite powder.
The preparation method is the same as example 1.
Comparative example 2:
the formula of the warm-mix modified asphalt of the comparative example comprises 100 parts of SBS (I-C) modified asphalt and 6 parts of warm-mix agent artificial zeolite powder.
The preparation method is the same as example 1.
Comparative example 3:
the formula of the warm-mix modified asphalt of the comparative example comprises 100 parts of SBS (I-C) modified asphalt and 7 parts of warm-mix agent artificial zeolite powder.
The preparation method is the same as example 1.
Comparative example 4:
the formula of the warm-mix modified asphalt of the comparative example comprises 100 parts of SBS (I-C) modified asphalt and a flame retardant, wherein the flame retardant is prepared from the following components in a mass ratio of 5: 1: 1 part of decabromodiphenylethane, antimony trioxide and aluminum hydroxide, namely 5 parts of decabromodiphenylethane, 1 part of antimony trioxide and 1 part of aluminum hydroxide.
The preparation method of the flame-retardant modified asphalt of this comparative example is the same as that of example 1.
The limit oxygen indexes of the SBS (I-C) modified asphalt, the asphalt obtained in examples 1-3 and comparative examples 1-4 were tested according to NB/SH/T0815-2010 asphalt burning performance test standards, and the test results are shown in Table 1.
TABLE 1 oxygen index of bitumen
As can be seen from Table 1, the SBS (I-C) modified asphalt has a limiting oxygen index of only 20.3% which is less than the oxygen concentration in air, and therefore, can be ignited directly with open flame in normal temperature air and can be continuously and stably combusted. With the addition of the warm-mixing agent artificial zeolite powder, the limited oxygen index of the warm-mixing asphalt (comparative examples 1-3) is increased, but the whole range is small, the limited oxygen index of the asphalt under the warm-mixing agent artificial zeolite powder with the addition amount of 7 percent is close to the oxygen concentration in the air, and the asphalt is still easy to ignite in the air. The limit oxygen index of the asphalt added with the flame retardant is greatly increased, and the limit oxygen index of the asphalt added with the flame retardant can reach 23.6% under the condition of 7% (comparative example 4), and the asphalt is difficult to ignite in the air. The invention modifies the asphalt by combining the flame retardant and the warm-mixing agent (example 1-3), so that the limited oxygen index of the modified asphalt is greatly increased, wherein the doping amount of the flame retardant is 7%, and the limited oxygen index when the doping amount of the warm-mixing agent is 7% reaches 26.1%, so that the limited oxygen index is greatly improved compared with that of comparative example 1-4, and therefore, the ignition performance and the flammability of the asphalt are effectively reduced due to the mutual synergy of the warm-mixing agent artificial zeolite powder and the flame retardant.
The pitches obtained in examples 1 to 3 and comparative examples 1 to 4 were subjected to cone calorimeter tests, respectively: the test specimen had a shape of a poured cake (inner diameter 70mm and thickness 10mm) and the intensity of heat radiation measured was 50kW/m2The test results are shown in Table 2.
TABLE 2 Cone calorimeter testing of bitumens
As can be seen from Table 2, the ignition time of the warm-mix modified asphalt (comparative example 3) added with 7% of the warm-mix agent artificial zeolite powder is 43s, which is 12s longer than that of SBS (I-C) modified asphalt, and the average heat release rate is reduced by 13.6%; the ignition time of the flame-retardant modified asphalt (comparative example 4) added with 7% of the flame retardant is 53s, which is prolonged by 22s compared with the ignition time of the modified asphalt, and the average heat release rate is reduced by 26.5%. The ignition time of the flame-retardant warm mix modified asphalt of example 1 added with the flame-retardant warm mix agent was 70s, which was 39s longer than that of SBS (I-C) modified asphalt, and the average heat release rate was reduced by 34.1%. The yield of CO was minimized in the flame-retardant warm-mix modified asphalt of example 1 to which the flame-retardant warm-mix agent was added, and when 7% of the flame retardant and 7% of the warm-mix agent were added (example 3), the CO release rate was only 68.5% of that of the modified asphalt, which was further reduced by 18.1% and 25.5% as compared with the flame-retardant modified asphalt to which 7% of the flame retardant and 7% of the warm-mix agent were added, respectively. Considering that more than half of the people die in a fire accident is caused by CO. Therefore, in the aspect of inhibiting toxic smoke release, the synergistic flame-retardant effect of the artificial zeolite powder and the flame retardant is remarkable, and the fire hazard of the asphalt can be further reduced.
Claims (10)
1. The flame-retardant warm-mix modified asphalt is characterized by comprising the following components in parts by mass:
100 portions of modified asphalt
3-8 parts of warm mixing agent
4-10 parts of flame retardant
Wherein the flame retardant comprises the following components in a mass ratio of (3-7): (0.5-2): (0.5-2) decabromodiphenylethane, antimony trioxide and aluminum hydroxide; the warm-mixing agent comprises artificial zeolite.
2. The flame-retardant warm-mix modified asphalt as claimed in claim 1, wherein the artificial zeolite contains crystal water, and the crystal water accounts for 15 to 25 mass percent of the artificial zeolite.
3. The flame-retardant warm mix modified asphalt of claim 1, wherein the modified asphalt is SBS modified asphalt.
4. The flame-retardant warm mix modified asphalt as claimed in any one of claims 1 to 3, wherein the flame retardant is a mixture of (4-6): (0.7-1.5): (0.7-1.5) decabromodiphenylethane, antimony trioxide and aluminum hydroxide.
5. The flame-retardant warm-mix modified asphalt according to any one of claims 1 to 3, wherein the amount of the flame retardant added is 7 to 9 parts.
6. The preparation method of the flame-retardant warm-mix modified asphalt as claimed in any one of claims 1 to 5, wherein the modified asphalt is heated, and then the warm-mix agent and the flame retardant are added and stirred to obtain the flame-retardant warm-mix modified asphalt.
7. The method according to claim 6, wherein the warm-mixing agent and the flame retardant are added after the modified asphalt is heated to 140-160 ℃.
8. The preparation method of claim 6, wherein after the warm-mix agent and the flame retardant are added, the mixture is stirred at a high speed, then stirred at a low speed and cooled to obtain the flame-retardant warm-mix modified asphalt; wherein the high-speed stirring speed is 4000-; the rotating speed of the low-speed stirring is 400-600r/min, and the time of the low-speed stirring is 10-20 min.
9. The method of claim 6, wherein the warm-mix agent is added first and the flame retardant is added.
10. The use of a flame-retardant warm-mix modified asphalt as claimed in any one of claims 1 to 5, or the use of the method of preparation as claimed in any one of claims 6 to 9, for the preparation of asphalt concrete.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011581563.6A CN113604060A (en) | 2020-12-28 | 2020-12-28 | Flame-retardant warm-mix modified asphalt and preparation method and application thereof |
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| CN202011581563.6A CN113604060A (en) | 2020-12-28 | 2020-12-28 | Flame-retardant warm-mix modified asphalt and preparation method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114836048A (en) * | 2021-12-22 | 2022-08-02 | 重庆交通大学 | Halloysite nanotube synergistic flame-retardant modified asphalt and preparation method thereof |
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| CN114836048A (en) * | 2021-12-22 | 2022-08-02 | 重庆交通大学 | Halloysite nanotube synergistic flame-retardant modified asphalt and preparation method thereof |
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