CN113480239A - Preparation method of asphalt concrete - Google Patents
Preparation method of asphalt concrete Download PDFInfo
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- CN113480239A CN113480239A CN202110877517.9A CN202110877517A CN113480239A CN 113480239 A CN113480239 A CN 113480239A CN 202110877517 A CN202110877517 A CN 202110877517A CN 113480239 A CN113480239 A CN 113480239A
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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
Abstract
A preparation method of asphalt concrete, it is a concrete production technical field, including steps such as the pitch modification, stir at room temperature, heat gradually, melt and stir, keep warm and is used for subsequent use, it shears the matrix pitch and gelatine powder, SBS, low density polyethylene, cross-linking agent to mix to make modified pitch and make into the powder particle, mix modified pitch powder particle and fine aggregate, coarse aggregate, coal cinder powder and heat gradually after mixing, melt and liquefy the modified pitch and stir, get the asphalt concrete stirred evenly; the beneficial effects are that the viscosity and softening point of the asphalt are integrally adjusted, so that the asphalt is more suitable for mixing; mixing the asphalt powder and the mixture, melting the asphalt into liquid, and stirring and mixing the liquid and the mixture to fully and uniformly mix the asphalt.
Description
Technical Field
The invention relates to the technical field of concrete production, in particular to a preparation method of asphalt concrete.
Background
The asphalt concrete is a mixture prepared by mixing mineral aggregate and road asphalt material. The asphalt concrete has two types of hot mixing and cold preparation during preparation, and the cold mixing mode is easy to fly ash when aggregate is heated and dried, so the hot mixing preparation mode is mostly adopted at present, the asphalt concrete of the hot mixing preparation mode mostly adopts a stirrer to mix sand, mortar and liquid asphalt, but the liquid asphalt is mixed and injected into the concrete for stirring and is limited by the viscosity of the asphalt and is gradually hardened along with the reduction of the temperature of the liquid asphalt; resulting in uneven mixing of the asphalt with the concrete; when the stirring rod mixes and stirs the inside asphalt concrete, the inside stirring materials are easy to adhere to the stirring rod to influence the stirring rod to stir the inside mixture, so that the stirring is insufficient, and the asphalt raw materials and the concrete raw materials are difficult to be uniformly mixed.
For example, patent document CN 111497014B discloses a process for preparing asphalt concrete, which comprises injecting mortar and gravel, stirring concrete, injecting liquid asphalt, stirring asphalt concrete, and maintaining the temperature of asphalt concrete, and using an auxiliary cylinder to reciprocate to push and extend the end of a stirring rod so as to make the stirring rod vibrate up and down; the stirring rods arranged in rows move integrally to stir the mixture in the inner part up and down in a molding manner, so that the mixing degree of the mixture in the inner part is promoted; the outer wall of the stirring rod is kept clean by the telescopic rod and the push ring moving on the stirring rod; the next stirring effect of the stirring rod on the internal mixture is ensured; meanwhile, the heating plate is used for heating to improve the temperature of the internal mixture, so that the molten state of the internal asphalt is maintained, the asphalt is prevented from being condensed, and the mixing between the asphalt and the concrete is ensured; the heat insulation cotton is arranged, so that the heat insulation effect in the material containing barrel is further improved; however, the scheme injects the liquid asphalt at the back, and the liquid asphalt has strong viscosity, so that the stirring at the back is difficult to achieve full uniformity, the stirring and mixing efficiency is low, and the use quality of the asphalt concrete is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for heating and stirring after mixing modified asphalt particles and mortar sand and stone uniformly, so as to fully mix asphalt and improve the quality of asphalt concrete.
In order to solve the technical problems, the technical scheme adopted by the invention is a preparation method of asphalt concrete, which comprises the following steps:
the method comprises the following steps of asphalt modification: taking 130-150 parts of matrix asphalt, 40-50 parts of rubber powder, 5-8 parts of SBS, 5-8 parts of low-density polyethylene and 1-2 parts of cross-linking agent according to parts by weight; reacting the matrix asphalt with a cross-linking agent at 157-177 ℃ for 1-3 hours at a stirring speed of 150-450 r/min; then the temperature is raised to 185-plus-200 ℃, rubber powder, SBS and low-density polyethylene are added and high-speed shearing is carried out, the shearing speed is 7500-plus-9000 r/min, and the shearing time is 30-50 minutes; then stirring for development, wherein the development temperature is 177-197 ℃, the stirring speed is 150-450r/min, and the development time is 1-3 hours; then naturally cooling, keeping the constant temperature for 7-8 hours at the temperature of 90-95 ℃, and then naturally cooling to the normal temperature to obtain the modified asphalt; crushing the modified asphalt to be within the range of 5-10 meshes to obtain modified asphalt particles; the softening point of the modified asphalt can reach 90 ℃.
Stirring at normal temperature: taking 10-20 parts of modified asphalt powder particles, 20-40 parts of fine aggregate, 35-70 parts of coarse aggregate and 5-10 parts of coal slag powder according to parts by weight; the particle sizes of the fine aggregate and the coal slag powder are both within the range of 5-10 meshes; firstly, blending and mixing modified asphalt powder particles, fine aggregate and coal cinder powder together to obtain mixed fine materials, wherein the mixed fine materials are easy to mix uniformly due to the fact that the particle diameters of the mixed fine materials are basically the same, and then mixing the mixed fine materials with equal parts of coarse aggregate to obtain a mixture.
Step-by-step heating: gradually heating the mixture in a stirring tank and integrally rotating the stirring tank; heating at a temperature below 85 deg.C at a rate of 0.8-1.2 deg.C per minute and rotating at a speed of 10-15r/min, heating at a temperature within 85-95 deg.C at a rate of 0.8-1.2 deg.C per 3 minutes and rotating at a speed of 10-15r/min, and heating at a temperature above 95 deg.C at a rate of 2-5 deg.C per minute and rotating at a speed of 20-30r/min until the temperature rises to 177-197 deg.C.
Fourthly, melting and stirring: when the temperature in the tank rises to 150-155 ℃, stirring the melt in the tank at the stirring speed of 20-30r/min, wherein the rotation direction of the stirring rod is the same as that of the stirring tank, and after the stirring tank stops rotating, continuously rotating and stirring the stirring rod for 3-5 minutes; obtaining the asphalt concrete.
Carrying out heat preservation for standby: the asphalt concrete is kept warm, and the temperature is maintained between 160 ℃ and 170 ℃ until the asphalt concrete is used.
The matrix asphalt is No. 70 road petroleum asphalt.
The cross-linking agent is sulfur.
The rubber powder is obtained by processing waste tires, the granularity of the rubber powder is 5-35 meshes,
the SBS has a star-shaped structure, and the range of S/B is 1: 3-2: 3, the weight average molecular weight is 100000-350000.
A method of preparing a preferred asphalt concrete comprising the steps of:
the method comprises the following steps of asphalt modification: taking 140 parts of matrix asphalt, 45 parts of rubber powder, 6.5 parts of SBS, 6.5 parts of low-density polyethylene and 1.5 parts of cross-linking agent; reacting the matrix asphalt with a cross-linking agent at 167 ℃, wherein the reaction temperature is 167 ℃, the reaction time is 90min, and the stirring speed is 300 r/min; then raising the temperature to 193 ℃, adding rubber powder, SBS and low density polyethylene, and shearing at high speed, wherein the shearing speed is 8250r/min, and the shearing time is 40 min; then stirring and developing are carried out, the development temperature is 187 ℃, the stirring speed is 300r/min, and the development time is 2 hours; then naturally cooling, keeping the constant temperature for 7.5 hours at the temperature of 93 ℃, and then naturally cooling to the normal temperature to obtain the solidified block modified asphalt; crushing the modified asphalt, sieving with a 5-mesh sieve to obtain a sieved substance, and sieving with a 10-mesh sieve to obtain an unscreened substance to obtain modified asphalt powder particles.
Stirring at normal temperature: taking 30 parts of modified asphalt powder particles, 60 parts of fine aggregate, 105 parts of coarse aggregate and 15 parts of coal cinder powder; the particle sizes of the fine aggregate and the coal slag powder are both between 5 and 10 meshes; firstly, blending modified asphalt powder particles, fine aggregate and coal cinder powder together and uniformly mixing to obtain mixed fine material, and then uniformly mixing the mixed fine material and coarse aggregate to obtain the asphalt mixture.
Step-by-step heating: gradually heating the mixture in a stirring tank, rotating the stirring tank integrally, heating to 0.9-1.1 deg.C per minute at a heating rate below 85 deg.C and at a rotation speed of 13r/min, heating to 0.9-1.1 deg.C per 3 min at a heating rate within the temperature range of 85-95 deg.C and at a rotation speed of 13r/min, heating to 3-4 deg.C per minute at a heating rate above 95 deg.C and at a rotation speed of 25r/min until the temperature is raised to 187 deg.C.
Fourthly, melting and stirring: when the temperature in the tank rises to 153 ℃, stirring the melt in the tank at the stirring speed of 25r/min, wherein the rotation direction of the stirring rod is the same as that of the stirring tank, and after the stirring tank stops rotating, continuously rotating and stirring the stirring rod for 4 minutes; obtaining the asphalt concrete.
Compared with the prior art, the invention has the following beneficial effects:
the asphalt is modified by rubber powder and low-density polyethylene, stays for a long time at a temperature of 90-95 ℃ during modification and cooling, and can greatly improve the softening point, so that the asphalt is favorably mixed with a mixture at a normal temperature stage, the viscosity can be adjusted, the asphalt is stirred and is not easy to bond during melting, and meanwhile, the asphalt pavement is not easy to soften when the temperature is high.
The particle sizes of the asphalt particles and the fine aggregate particles are the same, so that the asphalt particles and the fine aggregate particles can be mixed more easily; the weight of the primary asphalt mixture is the same as that of the coarse aggregate, and the mixture can be more easily mixed; the asphalt particles and the mixture are mixed uniformly at normal temperature, and then the mixture is heated to turn the asphalt into liquid state, and then the mixture is stirred to mix the asphalt concrete uniformly.
In the heating process, firstly, stirring is not carried out, and only the whole tank body is slowly rotated, so that the asphalt is directly melted in the asphalt mixture after being converted into a liquid state and is directly adhered to the mixture, and the asphalt can be better adhered to the mixture in the melting process by adjusting the heating speed in different temperature sections.
Fourthly, after the asphalt is thoroughly liquid, the stirring rod is used for stirring, the stirring is carried out when the tank body integrally rotates in the early stage, and the stirring is carried out continuously after the tank body stops rotating in the later stage, so that the asphalt is further uniformly mixed, and the asphalt is not easy to adhere to the stirring rod.
The viscosity and the softening point of the asphalt are integrally adjusted, so that the asphalt is more suitable for mixing; mixing the asphalt powder and the mixture, melting the asphalt into liquid, and stirring and mixing the liquid and the mixture to fully and uniformly mix the asphalt.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to illustrate the invention but not to limit it further, and should not be construed as limiting the scope of the invention.
Example 1.
The preparation method of the asphalt concrete comprises the following steps:
firstly, modifying asphalt: taking 130kg of No. 70 road petroleum asphalt as matrix asphalt, taking 40kg of waste tire rubber powder with the granularity of 5 meshes, taking 5kg of SBS particles, 5kg of low-density polyethylene particles and 1kg of sulfur; firstly, reacting matrix asphalt with sulfur at 157 ℃ for 1 hour at a stirring speed of 150 r/min; then, the temperature is raised to 185 ℃, rubber powder, SBS and low density polyethylene are added, and high speed shearing is carried out, wherein the shearing speed is 7500r/min, and the shearing time is 30 minutes; then stirring and developing are carried out, the development temperature is 177 ℃, the stirring speed is 150r/min, and the development time is 1 hour; then naturally cooling, keeping the constant temperature for 7 hours at the temperature of 90 ℃, and then naturally cooling to the normal temperature to obtain modified asphalt; crushing the modified asphalt, sieving with a 5-mesh sieve to obtain a sieved substance, and sieving with a 10-mesh sieve to obtain an unscreened substance to obtain modified asphalt powder particles with the particle size within the range of 5-10 meshes; and (5) returning and reprocessing the powder particles with the particle size larger than 5 meshes and smaller than 10 meshes.
The normal-temperature mixing is carried out: taking 10kg of modified asphalt powder particles, 20kg of fine aggregate, 35kg of coarse aggregate and 5kg of coal cinder powder; the particle sizes of the fine aggregate and the coal slag powder are both in the range of 5-10 meshes; firstly, blending modified asphalt powder particles, fine aggregate and coal cinder powder together and uniformly mixing to obtain mixed fine material, and then uniformly mixing the mixed fine material and coarse aggregate to obtain a mixture.
Step-by-step heating of the mixture: placing the mixture into a stirring tank for gradual heating and integrally rotating the stirring tank; heating at a temperature below 85 deg.C at a rate of 0.8-1.0 deg.C per minute and rotating at a speed of 10r/min, heating at a temperature within 85-95 deg.C at a rate of 0.8-1.0 deg.C per 3 minutes and rotating at a speed of 10r/min, and heating at a temperature above 95 deg.C at a rate of 2-3 deg.C per minute and rotating at a speed of 20r/min until the temperature rises to 177 deg.C.
Fourthly, melting and stirring: when the temperature in the stirring tank rises to 150 ℃, stirring the melt in the tank at the stirring speed of 20r/min, wherein the rotation direction of the stirring rod is the same as that of the stirring tank, and after the temperature in the stirring tank rises to 177 ℃ and stops rotating, continuously rotating and stirring the stirring rod for 3 minutes; obtaining the asphalt concrete.
Carrying out heat preservation for standby: the asphalt concrete is kept warm, and the temperature is maintained between 160 ℃ and 170 ℃ until the asphalt concrete is used.
Example 2.
A method of preparing a preferred asphalt concrete comprising the steps of:
firstly, modifying asphalt: taking 140kg of No. 70 road petroleum asphalt as matrix asphalt, taking 45kg of waste tire rubber powder with the granularity of 25 meshes, taking 6.5kg of SBS particles, 6.5kg of low-density polyethylene particles and 1.5kg of sulfur; reacting the matrix asphalt with sulfur at 167 ℃, the reaction time is 90min, and the stirring speed is 300 r/min; then raising the temperature to 193 ℃, adding rubber powder, SBS and low density polyethylene, and shearing at high speed, wherein the shearing speed is 8250r/min, and the shearing time is 40 min; then stirring and developing are carried out, the development temperature is 187 ℃, the stirring speed is 300r/min, and the development time is 2 hours; then naturally cooling, keeping the constant temperature for 7.5 hours at the temperature of 93 ℃, and then naturally cooling to the normal temperature to obtain the solidified block modified asphalt; crushing the modified asphalt, sieving with a 5-mesh sieve to obtain a sieved substance, and sieving with a 10-mesh sieve to obtain an unscreened substance to obtain modified asphalt powder particles.
The normal-temperature mixing is carried out: taking 30kg of modified asphalt powder particles, 60kg of fine aggregate, 105kg of coarse aggregate and 15kg of coal cinder powder; the particle sizes of the fine aggregate and the coal slag powder are both between 5 and 10 meshes; firstly, blending modified asphalt powder particles, fine aggregate and coal cinder powder together and uniformly mixing to obtain mixed fine material, and then uniformly mixing the mixed fine material and coarse aggregate to obtain a mixture.
Step-by-step heating of the mixture: gradually heating the mixture in a stirring tank, rotating the stirring tank integrally, heating to 0.9-1.1 deg.C per minute at a heating rate below 85 deg.C and at a rotation speed of 13r/min, heating to 0.9-1.1 deg.C per 3 min at a heating rate within the temperature range of 85-95 deg.C and at a rotation speed of 13r/min, heating to 3.0-4.0 deg.C per minute at a heating rate above 95 deg.C and at a rotation speed of 25r/min until the temperature is raised to 187 deg.C.
Fourthly, melting and stirring: stirring the melt in the tank when the temperature in the tank rises to 153 ℃, wherein the stirring speed is 25r/min, the rotation direction of the stirring rod is the same as that of the stirring tank, and after the temperature in the stirring tank rises to 187 ℃ and stops rotating, the stirring rod continues to rotate and stir for 4 minutes; obtaining the asphalt concrete.
Example 3.
The preparation method of the asphalt concrete comprises the following steps:
firstly, modifying asphalt: taking 150kg of No. 70 road petroleum asphalt as matrix asphalt, taking 50kg of waste tire rubber powder with the granularity of 35 meshes, taking 8kg of SBS particles, 8kg of low-density polyethylene particles and 2kg of sulfur; firstly, reacting matrix asphalt with sulfur at 177 ℃, wherein the reaction time is 3 hours, and the stirring speed is 450 r/min; then, the temperature is raised to 200 ℃, and rubber powder, SBS and low density polyethylene are added and sheared at high speed, wherein the shearing speed is 9000r/min, and the shearing time is 50 minutes; then stirring and developing are carried out, the development temperature is 197 ℃, the stirring speed is 450r/min, and the development time is 3 hours; then naturally cooling, keeping the constant temperature for 8 hours at the temperature of 95 ℃, and then naturally cooling to the normal temperature to obtain modified asphalt; crushing the modified asphalt, sieving with a 5-mesh sieve to obtain a sieved substance, and sieving with a 10-mesh sieve to obtain an unscreened substance, thereby obtaining modified asphalt powder particles with the particle size within the range of 5-10 meshes.
Secondly, stirring at normal temperature: taking 20kg of modified asphalt powder particles, 40kg of fine aggregate, 70kg of coarse aggregate and 10kg of coal cinder powder; the particle sizes of the fine aggregate and the coal slag powder are both in the range of 5-10 meshes; firstly, blending modified asphalt powder particles, fine aggregate and coal cinder powder together and uniformly mixing to obtain mixed fine material, and then uniformly mixing the mixed fine material and coarse aggregate to obtain a mixture.
Step-by-step heating: gradually heating the mixture in a stirring tank and integrally rotating the stirring tank; heating at a temperature below 85 deg.C at a rate of 1.0-1.2 deg.C per minute and rotating at a speed of 15r/min, heating at a temperature within 85-95 deg.C at a rate of 1.0-1.2 deg.C per 3 minutes and rotating at a speed of 15r/min, and heating at a temperature above 95 deg.C at a rate of 4-5 deg.C per minute and rotating at a speed of 30r/min until the temperature rises to 197 deg.C.
Fourthly, melting and stirring: when the temperature in the stirring tank rises to 155 ℃, stirring the melt in the stirring tank at the stirring speed of 30r/min, wherein the rotation direction of the stirring rod is the same as that of the stirring tank, and after the temperature in the stirring tank rises to 197 ℃ and stops rotating, continuously rotating and stirring the stirring rod for 5 minutes; obtaining the asphalt concrete.
Carrying out heat preservation for standby: the asphalt concrete is kept warm, and the temperature is maintained between 160 ℃ and 170 ℃ until the asphalt concrete is used.
Claims (6)
1. The preparation method of the asphalt concrete is characterized by comprising the following steps:
the method comprises the following steps of asphalt modification: taking 130-150 parts of matrix asphalt, 40-50 parts of rubber powder, 5-8 parts of SBS, 5-8 parts of low-density polyethylene and 1-2 parts of cross-linking agent; reacting the matrix asphalt with a cross-linking agent at 157-177 ℃ for 1-3 hours at a stirring speed of 150-450 r/min; then the temperature is raised to 185-plus-200 ℃, rubber powder, SBS and low-density polyethylene are added and high-speed shearing is carried out, the shearing speed is 7500-plus-9000 r/min, and the shearing time is 30-50 minutes; then stirring for development, wherein the development temperature is 177-197 ℃, the stirring speed is 150-450r/min, and the development time is 1-3 hours; then naturally cooling, keeping the constant temperature for 7-8 hours at the temperature of 90-95 ℃, and then naturally cooling to the normal temperature to obtain the modified asphalt; crushing the modified asphalt to 5-10 meshes to obtain modified asphalt particles;
stirring at normal temperature: taking 10-20 parts of modified asphalt powder particles, 20-40 parts of fine aggregate, 35-70 parts of coarse aggregate and 5-10 parts of coal slag powder; the particle sizes of the fine aggregate and the coal slag powder are both 5-10 meshes; firstly, blending modified asphalt powder particles, fine aggregate and coal cinder powder together and uniformly mixing to obtain mixed fine material, and then uniformly mixing the mixed fine material with equal parts of coarse aggregate to obtain a mixture;
step-by-step heating: gradually heating the mixture in a stirring tank and integrally rotating the stirring tank; heating at a heating rate below 85 ℃ of 0.8-1.2 ℃ per minute and rotating at a rotating speed of 10-15r/min, heating at a heating rate within the temperature range of 85-95 ℃ of 0.8-1.2 ℃ per 3 minutes and rotating at a rotating speed of 10-15r/min, and heating at a heating rate above 95 ℃ of 2-5 ℃ per minute and rotating at a rotating speed of 20-30r/min until the temperature rises to 177-197 ℃;
fourthly, melting and stirring: when the temperature in the tank rises to 150-155 ℃, stirring the melt in the tank by using a stirring rod at the stirring speed of 20-30r/min, wherein the rotation direction of the stirring rod is the same as that of the stirring tank, and after the stirring tank stops rotating, continuously rotating and stirring the stirring rod for 3-5 minutes; obtaining the asphalt concrete.
2. The method for preparing asphalt concrete according to claim 1, wherein the base asphalt is No. 70 road petroleum asphalt.
3. The method for producing an asphalt concrete according to claim 2, wherein said crosslinking agent is sulfur.
4. The method for preparing asphalt concrete according to claim 3, wherein the crumb rubber is obtained by processing waste tires and has a particle size of 10-35 mesh.
5. The method according to claim 4, wherein said SBS has a star-shaped structure, S/B ranges from 1: 3-2: 3, the weight average molecular weight is 100000-350000.
6. The method for preparing asphalt concrete according to claim 5, characterized in that the preferred embodiment comprises the following steps:
the method comprises the following steps of asphalt modification: taking 140 parts of matrix asphalt, 45 parts of rubber powder, 6.5 parts of SBS, 6.5 parts of low-density polyethylene and 1.5 parts of cross-linking agent; reacting the matrix asphalt with a cross-linking agent at 167 ℃, wherein the reaction temperature is 167 ℃, the reaction time is 90min, and the stirring speed is 300 r/min; then raising the temperature to 193 ℃, adding rubber powder, SBS and low density polyethylene, and shearing at high speed, wherein the shearing speed is 8250r/min, and the shearing time is 40 min; then stirring and developing are carried out, the development temperature is 187 ℃, the stirring speed is 300r/min, and the development time is 2 hours; then naturally cooling, keeping the constant temperature for 7.5 hours at the temperature of 93 ℃, and then naturally cooling to the normal temperature to obtain the solidified block modified asphalt; crushing the modified asphalt, sieving with a 5-mesh sieve to obtain a sieved substance, and sieving with a 10-mesh sieve to obtain an unscreened substance to obtain modified asphalt powder particles;
stirring at normal temperature: taking 30 parts of modified asphalt powder particles, 60 parts of fine aggregate, 105 parts of coarse aggregate and 15 parts of coal cinder powder; the particle sizes of the fine aggregate and the coal slag powder are both between 5 and 10 meshes; firstly, blending modified asphalt powder particles, fine aggregate and coal cinder powder together and uniformly mixing to obtain mixed fine material, and then uniformly mixing the mixed fine material and coarse aggregate to obtain a mixture;
step-by-step heating: gradually heating the mixture in a stirring tank, rotating the stirring tank integrally, heating to 0.9-1.1 ℃ per minute at a heating rate below 85 ℃ and at a rotating speed of 13r/min, heating to 0.9-1.1 ℃ per 3 minutes at a heating rate within the temperature range of 85-95 ℃ and at a rotating speed of 13r/min, heating to 3-4 ℃ per minute at a heating rate above 95 ℃ and at a rotating speed of 25r/min until the temperature is raised to 187 ℃;
fourthly, melting and stirring: when the temperature in the tank rises to 153 ℃, stirring the melt in the tank at the stirring speed of 25r/min, wherein the rotation direction of the stirring rod is the same as that of the stirring tank, and after the stirring tank stops rotating, continuously rotating and stirring the stirring rod for 4 minutes; obtaining the asphalt concrete.
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| CN202110877517.9A CN113480239A (en) | 2021-08-01 | 2021-08-01 | Preparation method of asphalt concrete |
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| CN114907071A (en) * | 2022-05-12 | 2022-08-16 | 青岛青建新型材料集团有限公司 | Sea sand and fiber-containing antioxidant and anticorrosive concrete and stirring preparation device thereof |
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