CN114315238A - Flame-retardant asphalt thin-layer pavement and preparation method thereof - Google Patents
Flame-retardant asphalt thin-layer pavement and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a flame-retardant asphalt thin-layer pavement and a preparation method thereof, and relates to the technical field of asphalt thin-layer pavements. Firstly, preparing modified asphalt by using hexa-diketo-dimethyl-aldehyde bromophenoxy methyl silane and amino ethyl ketone dimethoxy methyl silane to generate silica gel with a three-dimensional network structure and porphyrin-based super-conjugated microporous polymer; milling, spraying and layering the cement concrete base surface by using a glacial acetic acid solution and prime coat oil prepared from modified asphalt, and firmly meshing the prime coat oil and the cement concrete base surface together; and finally, carrying out high-temperature atomization rolling on the flame-retardant asphalt thin-layer material prepared from the modified asphalt, the aluminum chloride and the mineral aggregate by using a sodium hydroxide solution to form a metal porphyrin-based super-conjugated microporous polymer with photocatalytic performance, and forming an interpenetrating network structure of aluminum hydroxide gel and silicone gel to obtain the flame-retardant asphalt thin-layer pavement which can adsorb and degrade automobile exhaust and has good high-temperature resistance, compression resistance and elastic toughness.
Description
Technical Field
The invention relates to the technical field of asphalt thin-layer pavements, in particular to a flame-retardant asphalt thin-layer pavement and a preparation method thereof.
Background
In recent years, tunnel fire frequently occurs, when the tunnel is in fire, the temperature can reach over 800 ℃, asphalt can be combusted at high temperature, a large amount of smoke and toxic gas are released, secondary disasters are caused, and the asphalt concrete pavement is seriously damaged, particularly long tunnels, the fire hazard is serious, and huge economic loss and social hazard are caused, so the flame-retardant asphalt concrete pavement is adopted for highway tunnels.
With the development of science and technology and the continuous improvement of the flame-retardant asphalt concrete pavement technology, the requirements of people on the mechanical property and the environmental protection function of the flame-retardant asphalt concrete are increased day by day, so that the flame-retardant asphalt concrete has tail gas adsorption and degradation properties and good high temperature resistance, pressure resistance and elastic toughness, and becomes the technical problem of preparing the asphalt thin-layer pavement at present.
The present invention addresses this problem by preparing a flame-retardant asphalt thin pavement.
Disclosure of Invention
The invention aims to provide a flame-retardant asphalt thin-layer pavement and a preparation method thereof, and aims to solve the problems in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme:
the flame-retardant asphalt thin-layer pavement mainly comprises, by weight, 20-30 parts of a flame-retardant asphalt thin-layer material, 8-12 parts of penetrating layer oil, 40-60 parts of glacial acetic acid and 80-86 parts of a sodium hydroxide solution.
Further, the flame-retardant asphalt thin-layer material is prepared by mixing modified asphalt, mineral aggregate and aluminum chloride; the penetrating layer oil is prepared by mixing modified asphalt, kerosene and deionized water.
Furthermore, the modified asphalt is prepared by mixing base asphalt, adiketodicarboxyl bromophenoxy methyl silane and aminoacetophenonyl dimethoxy methyl silane.
Further, the mass fraction of the sodium hydroxide solution is 20-22%.
A preparation method of a flame-retardant asphalt thin-layer pavement mainly comprises the following preparation steps:
(1) milling 8-10 mm of a cement concrete base plane by using a milling machine, and cleaning to obtain a milled base plane; spraying glacial acetic acid on the milled base surface at the speed of 3-5L/min for 20-30 min, and paving permeable layer oil with the thickness of 8-12 mm at the temperature of 100-120 ℃ to obtain a pre-laid base surface;
(2) spreading a 30-40 mm flame-retardant asphalt thin layer material on the base surface of the pre-laid layer, spraying a sodium hydroxide solution for 80-90 min at a speed of 280-320L/min, tamping and rolling for 3-4 times by using a 22t road roller under the conditions of 100-120 ℃, a vibration frequency of 46-50 Hz and an amplitude of 0.34-0.76 mm, and drawing lines on the surface for leveling to obtain the flame-retardant asphalt thin layer pavement.
Further, the preparation method of the transmural oil in the step (1) is as follows: under the stirring conditions of 178-182 ℃ and 200-400 r/min, mixing the modified asphalt, the kerosene and the water according to the mass ratio of 2: 0.8: 1.8-2: 1.2: and 2.2, stirring for 50-70 min to obtain the penetrating layer oil.
Further, the preparation method of the flame-retardant asphalt thin layer material in the step (2) is as follows: heating the mineral aggregate to 203-207 ℃ to obtain a heated mineral aggregate; under the stirring condition of 180-190 ℃ and 60-80 r/min, heating the mineral aggregate, the modified asphalt and the aluminum chloride according to the mass ratio of 14: 1: 3-15: 1: and 5, mixing and stirring for 50-60 seconds to obtain the flame-retardant asphalt thin-layer material.
Further, the preparation method of the modified asphalt comprises the following steps: under the stirring condition of 400-600 r/min at 24-26 ℃, mixing the hexanedioldimethylaldehyde group bromophenyloxymethylsilane, the aminoacetophenonyl dimethoxy methylsilane and deionized water according to the mass ratio of 1: 1: 0.2-1: 1.2: stirring for 20-30 min for 0.4 to obtain a modifier; heating the matrix asphalt for 10-20 min under the stirring conditions of 120-130 ℃ and 2000-4000 r/min to obtain heated matrix asphalt; and then, dropwise adding a modifier which is 0.6-0.8 time of the mass of the heated matrix asphalt into the heated matrix asphalt at a dropping speed of 80-120 drops/min, stirring for 50-70 min at 2000-4000 r/min, and adjusting the temperature to 106-110 ℃ to obtain the modified asphalt.
Further, the mineral aggregate is prepared from 5-8 mm and 2-4 mm diabase aggregates according to the mass ratio of 3.8: 1-4.2: 1 are mixed to obtain the product.
Compared with the prior art, the invention has the following beneficial effects:
when the flame-retardant asphalt thin-layer pavement is prepared, cement concrete is used as a base surface, and milling, spraying and layering and high-temperature vibration, atomization and rolling layering are sequentially carried out to obtain the flame-retardant asphalt thin-layer pavement. Wherein the milling, spraying, layering and paving are carried out by using penetrating oil; the high-temperature vibration atomization rolling paving layer is paved with a flame-retardant asphalt thin layer material; the flame-retardant asphalt thin-layer material is obtained by mixing modified asphalt, mineral aggregate and aluminum chloride; the penetrating layer oil is prepared by mixing modified asphalt, kerosene and deionized water; the modified asphalt is prepared by mixing base asphalt, adiketodiformyl bromophenoxy methylsilane and aminoacetophenonyl dimethoxy methylsilane.
Firstly, preparing modified asphalt by using the hexanedioldimethylaldehyde bromophenoxy methylsilane, aminoacetophenone-dimethoxymethylsilane and matrix asphalt, wherein the hexanedioldipiecene in the hexanedioldimethylaldehyde bromophenyloxy methylsilane reacts with the aminoacetophenone in the aminoacetophenone-dimethoxymethylsilane to form covalent bond crosslinking, so that a pyrrole compound with a conjugated structure is generated, and the high-temperature resistance of the modified asphalt is enhanced; removing formaldehyde-based bromophenoxy methylsilane from the diketo-diformyl bromophenoxy methylsilane under the action of hydroxyl in amino ethyl keto-diformyl methyl siloxane to polymerize and form covalent bond crosslinking, and generating silica gel with a three-dimensional network structure and formaldehyde-based bromophenol, so that the viscosity of the asphalt is enhanced; the aldehyde group in the pyrrole compound and formaldehyde-based bromophenol is polymerized to form a porphyrin-based super-conjugated microporous polymer, so that the modified asphalt has adsorbability, and when the modified asphalt is subjected to high-temperature vibration, atomization, rolling and layering, free chloride ions are quickly adsorbed and captured by the modified asphalt to form coordinate bonds with secondary amine groups in porphyrin for crosslinking, so that the metal porphyrin-based super-conjugated microporous polymer with photocatalytic performance is generated, and automobile exhaust can be effectively adsorbed and degraded.
Secondly, milling, spraying and layering a cement concrete base surface by using glacial acetic acid and prime coat oil, so that the roughness and the surface activity of the concrete base surface are increased, the prime coat oil permeates into the cement concrete base surface, formaldehyde-based bromophenoxy groups are removed from the modified asphalt, the modified asphalt reacts with silicon hydroxyl groups on the concrete base surface to form a stable silicon gel network, and the prime coat oil and the concrete base surface are firmly meshed together, so that the compression resistance of the flame-retardant asphalt thin-layer pavement is enhanced; then, carrying out high-temperature vibration atomization rolling on the flame-retardant asphalt thin-layer material obtained by mixing the modified asphalt, the aluminum chloride and the mineral aggregate by using a sodium hydroxide solution, wherein part of the aluminum chloride chloridizes wax in the modified asphalt, so that the content of the wax in the modified asphalt is greatly reduced, the adhesion performance of the modified asphalt is enhanced, and the elasticity of the flame-retardant asphalt thin-layer pavement is enhanced; the rest aluminum chloride and aluminum silicate in the mineral react with sodium hydroxide to generate aluminum hydroxide gel, the modified asphalt and the mineral aggregate are firmly adhered together, and a super-crosslinked interpenetrating network structure is formed with a silicon gel network in the modified asphalt, so that the toughness of the flame-retardant asphalt thin-layer pavement is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to more clearly illustrate the method provided by the present invention, the following examples are provided to illustrate the method for testing each index of the flame-retardant asphalt thin pavement prepared in the following examples as follows:
high temperature resistance: the penetration of the flame-retardant asphalt thin-layer pavement prepared by the embodiment and the comparative example with the same length and width is tested according to the GB/T4509 standard method.
Elasticity: the modulus of elasticity of the flame-retardant asphalt thin-layer pavement prepared by the example and the comparative example with the same length and width was measured according to the JTGD50 standard method.
Compressive strength: the compression strength of the flame-retardant asphalt thin pavement prepared by the examples and the comparative examples having the same length and width was measured according to the ASTM D1074 standard method.
Tail gas adsorption degradation rate: under the conditions of 20 ℃ and 20W ultraviolet illumination, the flame-retardant asphalt thin-layer pavement prepared by the embodiment and the comparative example with the same length and width is placed in a closed space through which 20-22L of automobile exhaust with the concentration of 3000-5000 ppm is introduced, an automobile exhaust analyzer is used for testing the concentration of the automobile exhaust after illumination for 60min, and the degradation rate is (the concentration of the automobile exhaust after illumination for 60 min-the initial concentration of the automobile exhaust) 100%/the initial concentration of the automobile exhaust.
Example 1
The flame-retardant asphalt thin-layer pavement mainly comprises, by weight, 20 parts of a flame-retardant asphalt thin-layer material, 8 parts of prime coat oil, 40 parts of glacial acetic acid and 80 parts of a sodium hydroxide solution.
A preparation method of a flame-retardant asphalt thin-layer pavement mainly comprises the following preparation steps:
(1) under the stirring condition of 400r/min at 24 ℃, the mass ratio of the hexanedioldimethylaldehyde group bromophenyloxymethylsilane to the aminoacetophenone group dimethoxymethylsilane to the deionized water is 1: 1: stirring for 20min at 0.2 to obtain modifier; heating the matrix asphalt for 10min under the stirring conditions of 120 ℃ and 2000r/min to obtain heated matrix asphalt; then, a modifier which is 0.6 time of the mass of the heated matrix asphalt is dripped into the heated matrix asphalt at the dripping speed of 80 drops/min, the mixture is stirred for 50min at 2000r/min, and the temperature is adjusted to 106 ℃ to obtain modified asphalt;
(2) under the stirring conditions of 178 ℃ and 200r/min, the modified asphalt, the kerosene and the water are mixed according to the mass ratio of 2: 0.8: stirring for 50min to obtain penetrating layer oil; milling 8mm of the cement concrete base surface by using a milling machine, and cleaning to obtain a milled base surface; spraying glacial acetic acid on the milled base surface at the speed of 3L/min for 20min, and spreading penetrating layer oil with the thickness of 8mm at the temperature of 100 ℃ to obtain the base surface of the pre-laid layer;
(3) mixing 5mm and 2mm diabase aggregates according to the mass ratio of 3.8: 1, heating the mixed mineral aggregate to 203 ℃ to obtain a heated mineral aggregate; under the stirring conditions of 180 ℃ and 60r/min, the heated mineral aggregate, the modified asphalt and the aluminum chloride are mixed according to the mass ratio of 14: 1: 3, mixing and stirring for 50s to obtain a flame-retardant asphalt thin-layer material; spreading a 30mm flame-retardant asphalt thin layer material on the base surface of the pre-laid layer, spraying a sodium hydroxide solution with the mass fraction of 20% for 80min at a speed of 280L/min, compacting and rolling for 3 times by using a 22t road roller under the conditions of 100 ℃, the vibration frequency of 46Hz and the amplitude of 0.34mm, and leveling by drawing a line on the surface to obtain the flame-retardant asphalt thin layer pavement.
Example 2
The flame-retardant asphalt thin-layer pavement mainly comprises, by weight, 25 parts of a flame-retardant asphalt thin-layer material, 10 parts of prime coat oil, 50 parts of glacial acetic acid and 84 parts of a sodium hydroxide solution.
A preparation method of a flame-retardant asphalt thin-layer pavement mainly comprises the following preparation steps:
(1) under the stirring condition of 500r/min at 25 ℃, the mass ratio of the hexanedioldimethylaldehyde group bromophenyloxymethylsilane, the aminoacetophenone group dimethoxymethylsilane and the deionized water is 1: 1.1: stirring for 25min at 0.3 to obtain modifier; heating the matrix asphalt for 15min under the stirring conditions of 125 ℃ and 3000r/min to obtain heated matrix asphalt; then, a modifier which is 0.7 time of the mass of the heated matrix asphalt is dripped into the heated matrix asphalt at the dripping speed of 100 drops/min, the mixture is stirred for 60min at the speed of 3000r/min, and the temperature is adjusted to 108 ℃ to obtain modified asphalt;
(2) under the stirring conditions of 180 ℃ and 300r/min, the modified asphalt, the kerosene and the water are mixed according to the mass ratio of 2: 1: 2 stirring for 60min to obtain penetrating layer oil; milling 9mm of the cement concrete base surface by using a milling machine, and cleaning to obtain a milled base surface; spraying glacial acetic acid on the milled base surface at the speed of 3.5L/min for 25min, and spreading penetrating layer oil with the thickness of 10mm at the temperature of 110 ℃ to obtain a base surface of a pre-laid layer;
(3) mixing diabase aggregates with the weight ratio of 6.5mm to 3mm according to the mass ratio of 4: 1, heating the mixed mineral aggregate to 205 ℃ to obtain a heated mineral aggregate; under the stirring conditions of 185 ℃ and 70r/min, the heated mineral aggregate, the modified asphalt and the aluminum chloride are mixed according to the mass ratio of 14.5: 1: 4, mixing and stirring for 55s to obtain a flame-retardant asphalt thin-layer material; spreading a 35mm flame-retardant asphalt thin layer material on the base surface of the pre-laid layer, spraying a sodium hydroxide solution with the mass fraction of 21% for 85min at the rate of 300L/min, compacting and rolling for 3 times by using a 22t road roller under the conditions of 110 ℃, the vibration frequency of 48Hz and the amplitude of 0.5mm, and leveling by drawing a line on the surface to obtain the flame-retardant asphalt thin layer pavement.
Example 3
The flame-retardant asphalt thin-layer pavement mainly comprises, by weight, 30 parts of a flame-retardant asphalt thin-layer material, 12 parts of prime coat oil, 60 parts of glacial acetic acid and 86 parts of a sodium hydroxide solution.
A preparation method of a flame-retardant asphalt thin-layer pavement mainly comprises the following preparation steps:
(1) under the stirring condition of 26 ℃ and 600r/min, the mass ratio of the hexanedioldimethylaldehyde bromobenzoyloxymethylsilane, the aminoacetophenone dimethoxy methylsilane and the deionized water is 1: 1.2: stirring for 30min at 0.4 to obtain modifier; heating the matrix asphalt for 20min under the stirring conditions of 130 ℃ and 4000r/min to obtain heated matrix asphalt; then, a modifier which is 0.8 time of the mass of the heated matrix asphalt is dripped into the heated matrix asphalt at the dripping speed of 120 drops/min, the mixture is stirred for 70min at the speed of 4000r/min, and the temperature is adjusted to 110 ℃ to obtain modified asphalt;
(2) under the stirring conditions of 182 ℃ and 400r/min, mixing the modified asphalt, the kerosene and the water according to the mass ratio of 2: 1.2: 2.2 stirring for 70min to obtain a penetrating layer oil; milling the cement concrete base surface by a milling machine for 10mm, and cleaning to obtain a milled base surface; spraying glacial acetic acid on the milled base surface at the speed of 5L/min for 30min, and spreading penetrating layer oil with the thickness of 12mm at the temperature of 120 ℃ to obtain the base surface of the pre-laid layer;
(3) mixing 8mm and 4mm diabase aggregates according to a mass ratio of 4.2: 1, heating the mixed mineral aggregate to 207 ℃ to obtain a heated mineral aggregate; under the stirring condition of 190 ℃ and 80r/min, the heated mineral aggregate, the modified asphalt and the aluminum chloride are mixed according to the mass ratio of 15: 1: 5, mixing and stirring for 60s to obtain a flame-retardant asphalt thin-layer material; paving a 40mm flame-retardant asphalt thin layer material on the base surface of the pre-paved layer, spraying a sodium hydroxide solution with the mass fraction of 22% for 90min at the rate of 320L/min, compacting and rolling for 4 times by using a 22t road roller under the conditions of 120 ℃, the vibration frequency of 50Hz and the amplitude of 0.76mm, and leveling by drawing a line on the surface to obtain the flame-retardant asphalt thin layer pavement.
Comparative example 1
The flame-retardant asphalt thin-layer pavement mainly comprises, by weight, 25 parts of a flame-retardant asphalt thin-layer material, 10 parts of prime coat oil, 50 parts of glacial acetic acid and 84 parts of a sodium hydroxide solution.
A preparation method of a flame-retardant asphalt thin-layer pavement mainly comprises the following preparation steps:
(1) under the stirring condition of 25 ℃ and 500r/min, the deionized water of the hexanedioldimethylaldehyde bromobenzoyloxymethylsilane is mixed according to the mass ratio of 1: stirring for 25min at 0.3 to obtain modifier; heating the matrix asphalt for 15min under the stirring conditions of 125 ℃ and 3000r/min to obtain heated matrix asphalt; then, a modifier which is 0.7 time of the mass of the heated matrix asphalt is dripped into the heated matrix asphalt at the dripping speed of 100 drops/min, the mixture is stirred for 60min at the speed of 3000r/min, and the temperature is adjusted to 108 ℃ to obtain modified asphalt;
(2) under the stirring conditions of 180 ℃ and 300r/min, the modified asphalt, the kerosene and the water are mixed according to the mass ratio of 2: 1: 2 stirring for 60min to obtain penetrating layer oil; milling 9mm of the cement concrete base surface by using a milling machine, and cleaning to obtain a milled base surface; spraying glacial acetic acid on the milled base surface at the speed of 3.5L/min for 25min, and spreading penetrating layer oil with the thickness of 10mm at the temperature of 110 ℃ to obtain a base surface of a pre-laid layer;
(3) mixing diabase aggregates with the weight ratio of 6.5mm to 3mm according to the mass ratio of 4: 1, heating the mixed mineral aggregate to 205 ℃ to obtain a heated mineral aggregate; under the stirring conditions of 185 ℃ and 70r/min, the heated mineral aggregate, the modified asphalt and the aluminum chloride are mixed according to the mass ratio of 14.5: 1: 4, mixing and stirring for 55s to obtain a flame-retardant asphalt thin-layer material; spreading a 35mm flame-retardant asphalt thin layer material on the base surface of the pre-laid layer, spraying a sodium hydroxide solution with the mass fraction of 21% for 85min at the rate of 300L/min, compacting and rolling for 3 times by using a 22t road roller under the conditions of 110 ℃, the vibration frequency of 48Hz and the amplitude of 0.5mm, and leveling by drawing a line on the surface to obtain the flame-retardant asphalt thin layer pavement.
Comparative example 2
The flame-retardant asphalt thin-layer pavement mainly comprises, by weight, 25 parts of a flame-retardant asphalt thin-layer material, 10 parts of prime coat oil, 50 parts of glacial acetic acid and 84 parts of a sodium hydroxide solution.
A preparation method of a flame-retardant asphalt thin-layer pavement mainly comprises the following preparation steps:
(1) under the stirring condition of 500r/min at 25 ℃, the mass ratio of the hexanedioldimethylaldehyde group bromophenyloxymethylsilane, the aminoacetophenone group dimethoxymethylsilane and the deionized water is 1: 1.1: stirring for 25min at 0.3 to obtain modifier; heating the matrix asphalt for 15min under the stirring conditions of 125 ℃ and 3000r/min to obtain heated matrix asphalt; then, a modifier which is 0.7 time of the mass of the heated matrix asphalt is dripped into the heated matrix asphalt at the dripping speed of 100 drops/min, the mixture is stirred for 60min at the speed of 3000r/min, and the temperature is adjusted to 108 ℃ to obtain modified asphalt;
(2) under the stirring conditions of 180 ℃ and 300r/min, the modified asphalt, the kerosene and the water are mixed according to the mass ratio of 2: 1: 2 stirring for 60min to obtain penetrating layer oil; milling 9mm of the cement concrete base surface by using a milling machine, and cleaning to obtain a milled base surface; paving permeable layer oil with the thickness of 10mm on the milled base surface to obtain a base surface of a pre-laid layer;
(3) mixing diabase aggregates with the weight ratio of 6.5mm to 3mm according to the mass ratio of 4: 1, heating the mixed mineral aggregate to 205 ℃ to obtain a heated mineral aggregate; under the stirring conditions of 185 ℃ and 70r/min, the heated mineral aggregate, the modified asphalt and the aluminum chloride are mixed according to the mass ratio of 14.5: 1: 4, mixing and stirring for 55s to obtain a flame-retardant asphalt thin-layer material; spreading a 35mm flame-retardant asphalt thin layer material on the base surface of the pre-laid layer, spraying a sodium hydroxide solution with the mass fraction of 21% for 85min at the rate of 300L/min, compacting and rolling for 3 times by using a 22t road roller under the conditions of 110 ℃, the vibration frequency of 48Hz and the amplitude of 0.5mm, and leveling by drawing a line on the surface to obtain the flame-retardant asphalt thin layer pavement.
Comparative example 3
The flame-retardant asphalt thin-layer pavement mainly comprises, by weight, 25 parts of a flame-retardant asphalt thin-layer material, 10 parts of prime coat oil, 50 parts of glacial acetic acid and 84 parts of a sodium hydroxide solution.
A preparation method of a flame-retardant asphalt thin-layer pavement mainly comprises the following preparation steps:
(1) under the stirring condition of 500r/min at 25 ℃, the mass ratio of the hexanedioldimethylaldehyde group bromophenyloxymethylsilane, the aminoacetophenone group dimethoxymethylsilane and the deionized water is 1: 1.1: stirring for 25min at 0.3 to obtain modifier; heating the matrix asphalt for 15min under the stirring conditions of 125 ℃ and 3000r/min to obtain heated matrix asphalt; then, a modifier which is 0.7 time of the mass of the heated matrix asphalt is dripped into the heated matrix asphalt at the dripping speed of 100 drops/min, the mixture is stirred for 60min at the speed of 3000r/min, and the temperature is adjusted to 108 ℃ to obtain modified asphalt;
(2) under the stirring conditions of 180 ℃ and 300r/min, the modified asphalt, the kerosene and the water are mixed according to the mass ratio of 2: 1: 2 stirring for 60min to obtain penetrating layer oil; milling 9mm of the cement concrete base surface by using a milling machine, and cleaning to obtain a milled base surface; spraying glacial acetic acid on the milled base surface at the speed of 3.5L/min for 25min, and spreading penetrating layer oil with the thickness of 10mm at the temperature of 110 ℃ to obtain a base surface of a pre-laid layer;
(3) mixing diabase aggregates with the weight ratio of 6.5mm to 3mm according to the mass ratio of 4: 1, heating the mixed mineral aggregate to 205 ℃ to obtain a heated mineral aggregate; under the stirring conditions of 185 ℃ and 70r/min, the heated mineral aggregate and the modified asphalt are mixed according to the mass ratio of 14.5: 1, mixing and stirring for 55s to obtain a flame-retardant asphalt thin-layer material; spreading a 35mm flame-retardant asphalt thin layer material on the base surface of the pre-laid layer, spraying a sodium hydroxide solution with the mass fraction of 21% for 85min at the rate of 300L/min, compacting and rolling for 3 times by using a 22t road roller under the conditions of 110 ℃, the vibration frequency of 48Hz and the amplitude of 0.5mm, and leveling by drawing a line on the surface to obtain the flame-retardant asphalt thin layer pavement.
Comparative example 4
The flame-retardant asphalt thin-layer pavement mainly comprises, by weight, 25 parts of a flame-retardant asphalt thin-layer material, 10 parts of prime coat oil, 50 parts of glacial acetic acid and 84 parts of a sodium hydroxide solution.
A preparation method of a flame-retardant asphalt thin-layer pavement mainly comprises the following preparation steps:
(1) under the stirring condition of 500r/min at 25 ℃, the mass ratio of the hexanedioldimethylaldehyde group bromophenyloxymethylsilane, the aminoacetophenone group dimethoxymethylsilane and the deionized water is 1: 1.1: stirring for 25min at 0.3 to obtain modifier; heating the matrix asphalt for 15min under the stirring conditions of 125 ℃ and 3000r/min to obtain heated matrix asphalt; then, a modifier which is 0.7 time of the mass of the heated matrix asphalt is dripped into the heated matrix asphalt at the dripping speed of 100 drops/min, the mixture is stirred for 60min at the speed of 3000r/min, and the temperature is adjusted to 108 ℃ to obtain modified asphalt;
(2) under the stirring conditions of 180 ℃ and 300r/min, the modified asphalt, the kerosene and the water are mixed according to the mass ratio of 2: 1: 2 stirring for 60min to obtain penetrating layer oil; milling 9mm of the cement concrete base surface by using a milling machine, and cleaning to obtain a milled base surface; spraying glacial acetic acid on the milled base surface at the speed of 3.5L/min for 25min, and spreading penetrating layer oil with the thickness of 10mm at the temperature of 110 ℃ to obtain a base surface of a pre-laid layer;
(3) mixing diabase aggregates with the weight ratio of 6.5mm to 3mm according to the mass ratio of 4: 1, heating the mixed mineral aggregate to 205 ℃ to obtain a heated mineral aggregate; under the stirring conditions of 185 ℃ and 70r/min, the heated mineral aggregate, the modified asphalt and the aluminum chloride are mixed according to the mass ratio of 14.5: 1: 4, mixing and stirring for 55s to obtain a flame-retardant asphalt thin-layer material; and (3) paving a 35mm flame-retardant asphalt thin layer material on the base surface of the pre-laid layer, compacting and rolling for 3 times by using a 22t road roller at the temperature of 110 ℃, and leveling by drawing a line on the surface to obtain the flame-retardant asphalt thin layer pavement.
Examples of effects
The following table 1 shows the analysis results of the elastic modulus, the high temperature resistance, the compression resistance and the tail gas adsorption degradation rate of the flame-retardant asphalt thin-layer pavement prepared by the examples 1 to 3 and the comparative examples 1 to 4 of the present invention.
TABLE 1
From table 1, it can be seen that the flame-retardant asphalt thin-layer pavement prepared in examples 1, 2 and 3 can adsorb and degrade automobile exhaust and has good high temperature resistance, compression resistance and elasticity; comparing experimental data of examples 1, 2 and 3 with experimental data of comparative examples 1, 3 and 4, it can be found that when a substrate asphalt is modified by using a hexaketodiformylbromyloxymethylsilane and an aminoacetophenone dimethoxymethylsilane, and a flame-retardant asphalt thin-layer material obtained by mixing the modified asphalt, aluminum chloride and mineral aggregate is subjected to high-temperature atomization and rolling by using a sodium hydroxide solution, an interpenetrating network structure is formed by generating aluminum hydroxide gel and silica gel, the mineral aggregate and the asphalt are firmly attached together, the obtained flame-retardant asphalt thin-layer pavement has a metal porphyrin-based super-conjugated microporous polymer, and the flame-retardant asphalt thin-layer pavement can adsorb and degrade automobile exhaust and has good high-temperature resistance and elasticity; from the comparison of the experimental data of examples 1, 2 and 3 and comparative example 2, it can be found that when the glacial acetic acid solution and the modified asphalt are used for milling, spraying and layering the cement concrete base surface on the flame-retardant asphalt thin-layer pavement, the roughness of the cement concrete base surface is higher, the oil-permeable layer and the cement concrete base surface react to form silica-silica chemical bond crosslinking to form a three-dimensional network structure, the meshing between the oil-permeable layer and the cement concrete base surface is firmer, and the compression resistance of the flame-retardant asphalt thin-layer pavement is stronger.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. The flame-retardant asphalt thin-layer pavement is characterized by mainly comprising, by weight, 20-30 parts of a flame-retardant asphalt thin-layer material, 8-12 parts of penetrating layer oil, 40-60 parts of glacial acetic acid and 80-86 parts of a sodium hydroxide solution.
2. A flame-retardant asphalt thin-layer pavement according to claim 1, wherein the flame-retardant asphalt thin-layer material is prepared by mixing modified asphalt, mineral aggregate and aluminum chloride; the penetrating layer oil is prepared by mixing modified asphalt, kerosene and deionized water.
3. The thin-layer asphalt pavement as claimed in claim 2, wherein the modified asphalt is prepared by mixing base asphalt, adiketodiformylbromyloxymethylsilane and aminoacetophenonyldimethoxymethylsilane.
4. A fire retardant bituminous thin layer pavement according to claim 3, characterized in that the sodium hydroxide solution is present in a mass fraction of 20-22%.
5. The preparation method of the flame-retardant asphalt thin-layer pavement is characterized by mainly comprising the following preparation steps of:
(1) milling 8-10 mm of a cement concrete base plane by using a milling machine, and cleaning to obtain a milled base plane; spraying glacial acetic acid on the milled base surface at the speed of 3-5L/min for 20-30 min, and paving permeable layer oil with the thickness of 8-12 mm at the temperature of 100-120 ℃ to obtain a pre-laid base surface;
(2) spreading a 30-40 mm flame-retardant asphalt thin layer material on the base surface of the pre-laid layer, spraying a sodium hydroxide solution for 80-90 min at a speed of 280-320L/min, tamping and rolling for 3-4 times by using a 22t road roller under the conditions of 100-120 ℃, a vibration frequency of 46-50 Hz and an amplitude of 0.34-0.76 mm, and drawing lines on the surface for leveling to obtain the flame-retardant asphalt thin layer pavement.
6. The method for preparing the flame-retardant asphalt thin-layer pavement according to claim 5, wherein the preparation method of the prime coat oil in the step (1) is as follows: under the stirring conditions of 178-182 ℃ and 200-400 r/min, mixing the modified asphalt, the kerosene and the water according to the mass ratio of 2: 0.8: 1.8-2: 1.2: and 2.2, stirring for 50-70 min to obtain the penetrating layer oil.
7. The preparation method of the flame-retardant asphalt thin-layer pavement according to claim 6, wherein the preparation method of the flame-retardant asphalt thin-layer material in the step (2) is as follows: heating the mineral aggregate to 203-207 ℃ to obtain a heated mineral aggregate; under the stirring condition of 180-190 ℃ and 60-80 r/min, heating the mineral aggregate, the modified asphalt and the aluminum chloride according to the mass ratio of 14: 1: 3-15: 1: and 5, mixing and stirring for 50-60 seconds to obtain the flame-retardant asphalt thin-layer material.
8. The method for preparing the flame-retardant asphalt thin-layer pavement according to the claims 6 and 7, characterized in that the method for preparing the modified asphalt comprises the following steps: under the stirring condition of 400-600 r/min at 24-26 ℃, mixing the hexanedioldimethylaldehyde group bromophenyloxymethylsilane, the aminoacetophenonyl dimethoxy methylsilane and deionized water according to the mass ratio of 1: 1: 0.2-1: 1.2: stirring for 20-30 min for 0.4 to obtain a modifier; heating the matrix asphalt for 10-20 min under the stirring conditions of 120-130 ℃ and 2000-4000 r/min to obtain heated matrix asphalt; and then, dropwise adding a modifier which is 0.6-0.8 time of the mass of the heated matrix asphalt into the heated matrix asphalt at a dropping speed of 80-120 drops/min, stirring for 50-70 min at 2000-4000 r/min, and adjusting the temperature to 106-110 ℃ to obtain the modified asphalt.
9. The preparation method of the flame-retardant asphalt thin-layer pavement according to claim 8, wherein the mineral aggregate is prepared from 5-8 mm and 2-4 mm diabase aggregates according to a mass ratio of 3.8: 1-4.2: 1 are mixed to obtain the product.
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| CN109162162A (en) * | 2018-08-15 | 2019-01-08 | 徐润宝 | A kind of construction method promoting durability of asphalt pavement |
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| CN1760279A (en) * | 2005-10-13 | 2006-04-19 | 武汉理工大学 | Method for preparing fire-fighting noise rreduced, skidproof material of road surface in tunnel |
| CN102910861A (en) * | 2012-09-26 | 2013-02-06 | 天津市市政工程研究院 | Asphalt mixture with high anti-rut capability and preparation method therefor |
| CN109162162A (en) * | 2018-08-15 | 2019-01-08 | 徐润宝 | A kind of construction method promoting durability of asphalt pavement |
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