CN101475746A - Waste asphalt reclaiming agent and preparation thereof - Google Patents
Waste asphalt reclaiming agent and preparation thereof Download PDFInfo
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- CN101475746A CN101475746A CNA2009100605323A CN200910060532A CN101475746A CN 101475746 A CN101475746 A CN 101475746A CN A2009100605323 A CNA2009100605323 A CN A2009100605323A CN 200910060532 A CN200910060532 A CN 200910060532A CN 101475746 A CN101475746 A CN 101475746A
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Abstract
The invention relates to a waste asphalt reclaiming agent and a preparation method thereof. The waste asphalt reclaiming agent is characterized in that the waste asphalt reclaiming agent is prepared from the following raw materials in portion by weight: 10 to 40 portions of waste rubber powder, 60 to 90 portions of heavy traffic asphalt, 0 to 5 portions of anti-aging agent, 0.01 to 10 portions of stabilizing agent, and 0.1 to 25 portions of solubilizer. The preparation method for the waste asphalt reclaiming agent is characterized by comprising the following steps: 1) selecting the raw materials; and 2) heating the heavy traffic asphalt to be between 140 and 190 DEG C, feeding the waste rubber powder into the molten heavy traffic asphalt, stirring the mixture for 0.5 to 2 hours at low speed, then feeding the anti-aging agent, the stabilizing agent and the solubilizer into the mixture, shearing the mixture for 0.5 to 3 hours at high speed, and cooling the mixture to normal temperature to obtain the waste asphalt reclaiming agent. The waste asphalt reclaiming agent and the preparation method thereof have the characteristics of low cost and simple process.
Description
Technical field
The invention belongs to waste and utilize the field again, be specifically related to waste asphalt reclaiming agent and preparation method thereof.
Background technology
At present, China has 12% bituminous pavement to overhaul every year, and the discarded amount of old pitch will reach annual 2200000 t, if can be used, and can save materials cost 3.5 hundred million every year.After 10 years, the old pitch of overhauling generation will reach 1,000 ten thousand tons, when the time comes every year can intensive materials cost 1,500,000,000 by regeneration.Equally, the utilization of waste rubber tire also is a great problem of Chinese present situation.2007, China's junked tire generation reached 1.6 hundred million, and expecting 2010 will be above 200,000,000.How to effectively utilize so huge waste asphalt mixture and waste and used rubber tyre of quantity, also just become countries in the world investigators' focus.
And the cold in place recycling technical development that utilizes emulsified bitumen or foam asphalt to carry out that present domestic part provinces and cities rise is rapider, though it is simple efficient, but its use range has certain limitation, it is shorter to only limit to following road surface of urban pavement and secondary and life-span, it is difficult to carry out cold reproduction ratio on motorway, and therefore the research that reaches about regenerator around heat regeneration is the direction that vast scientific research person works hard always.Plant-mix heat recycle technology is used the most general at present, and all be used for road surface structare layer, the regeneration rate of old asphalt concrete is more than 75%, the waste asphalt mixture utilization ratio of Japan has reached 100% especially, and abroad the performance requriements to Recycled Asphalt Pavement all is not less than brand-new bituminous concrete.
No matter be the regenerating waste asphalt road surface or the research of regenerated rubber bituminous pavement, a large amount of scientific research achievement in research and application are abroad all arranged, and domestic Bi Hong such as builds at the people regeneration asphalt has been carried out big quantity research, people such as Huang Dunhao study rubber asphalt, but " two useless " research and the application that waste Crumb rubber and useless asphalt combine but rarely had report.Existing Imported Asphalt regenerator restricts its applying of market at home because its complicated component costs an arm and a leg; And lightweight oil such as lubricating oil that the home-made regenerator mainly is some petroleum industries to be produced, diesel oil, machine oil or their mixture, be used for modified waste pitch, regeneration effect is unsatisfactory, a certain amount of new pitch or regenerator must be in waste asphalt, mixed, the service requirements of high grade pavement could be satisfied.
Past has the people to attempt the component of comparison waste asphalt component and high-quality asphalt, decide the component that to add in the old pitch, and then find regenerator with this components do match, but this trial is success not, because bituminous chemical structure and complexity thereof, even the pitch that chemical composition is identical, because of the oil sources base belongs to and the production technique difference, its performance also has very big variation, in addition, find certain fixedly regenerator of component, have on technology and think difficulty greatly, very high to equipment and processing requirement, cost is also very high.In addition, existing regenerator generally adds in the waste asphalt mixture with new pitch and uses the technology more complicated.
Summary of the invention
The object of the present invention is to provide low waste asphalt reclaiming agent of a kind of cost and preparation method thereof, this method technology is simple.
To achieve these goals, technical scheme of the present invention is: waste asphalt reclaiming agent is characterized in that it forms by comprising waste Crumb rubber, heavy traffic paving asphalt, antiaging agent, stablizer and solubilizing agent feedstock production; The shared parts by weight of each raw material are:
10～40 parts of waste Crumb rubbers;
60～90 parts of heavy traffic paving asphalts;
0～5 part of antiaging agent;
0.01～10 part of stablizer;
0.1～25 part of solubilizing agent.
To be waste tire of automobile become fineness through broken, grinding to described waste Crumb rubber is 20～200 purpose rubber powders.
Described antiaging agent is 2; in 6-di-t-butyl-4 methylphenol, N-ethanoyl-L-tyrosine amine, p-Nitroaniline, amyl phthalate, diatomite, the wilkinite any one or any mixing more than two kinds, any is any proportioning when mixing more than two kinds.
Described stablizer is any one or any mixing more than two kinds in acrylate, Sasobit (husky rope Bhide asphalt modifier), the metal chloride, and any is any proportioning when mixing more than two kinds.
Described metal chloride is any one or any mixing more than two kinds in calcium chloride, sodium-chlor, the iron(ic) chloride, and any is any proportioning when mixing more than two kinds.
Described solubilizing agent is any one or any mixing more than two kinds in aromatic hydrocarbon oil, naphthenic oil, tar resin, Gum Rosin, divinyl, the methylethylketone, and any is any proportioning when mixing more than two kinds.
The shared parts by weight the best of antiaging agent is 1～3 part.
The preparation method of waste asphalt reclaiming agent is characterized in that it comprises the steps:
1) by the shared parts by weight of each raw material is: 10～40 parts of waste Crumb rubbers; 60～90 parts of heavy traffic paving asphalts; 0～5 part of antiaging agent; 0.01～10 part of stablizer; 0.1～25 part of solubilizing agent is chosen waste Crumb rubber, heavy traffic paving asphalt, antiaging agent, stablizer and solubilizing agent raw material, and is standby;
2) heavy traffic paving asphalt is warmed to 140～190 ℃, waste Crumb rubber is put in the heavy traffic paving asphalt that has melted, behind stirring at low speed 0.5～2h, drop into antiaging agent, stablizer and solubilizing agent, behind high speed shear 0.5～3h, be cooled to normal temperature, obtain waste asphalt reclaiming agent.
High speed shear of the present invention is meant that rotating speed is 3000～7000 rev/mins.Stirring at low speed refers to that mixing speed is below 1400 rev/mins.
The application of waste asphalt reclaiming agent: waste asphalt pavement is milled throwing, after the secondary breaking, get the waste asphalt mixture after the fragmentation, extracting, survey its bitumen aggregate ratio and grating, determine the volume of waste asphalt reclaiming agent and add the grating of newly gathering materials, the volume of waste asphalt reclaiming agent is 0.2～1.5% of a waste asphalt mixture quality.Waste asphalt reclaiming agent and high temperature waste asphalt mixture (being waste asphalt) is compound, behind mix 90～120s (duration of mixing prolongs 10～50s), add newly gather materials and new pitch after mix make reclaimed asphalt mixture.
Utilize the mechanism of action of the waste asphalt reclaiming agent that waste Crumb rubber produces as follows:
1) aged asphalt activation: mixing of waste asphalt reclaiming agent improved bitum degradation capability and dissolving power.Light oil constituents in the waste asphalt reclaiming agent and other fine solvent component make the bituminous matter in the aged asphalt dissolve dispersion again, regulate the pitch colloidal structure, improve the pitch rheological property and make waste asphalt activatory purpose thereby reach.
2) asphalt modification effect: waste asphalt reclaiming agent is in wet-mixing and transportation, waste asphalt reclaiming agent and aging dissolving or swelling mutually, form the hinge reticulated structure, regulate old bituminous viscosity, the too high viscosity of old pitch is reduced, make too hard crisp old asphalt mixture softening,, and reduce new bituminous temperature sensitivity with the new pitch uniform mixing that newly gathers materials.
3) anti-aging effect: the antiaging agent in the waste asphalt reclaiming agent becomes pitch and the new bituminous resistance to deterioration after activation improves in branch.
4) viscosifying action that gathers materials: can run into gathering materials of peeling off or partly peel off when waste asphalt reclaiming agent and old material mix, the waste asphalt reclaiming agent partial melting is in surface of aggregate, improved the cohesiveness of gathering materials and the water stability of compound.
5) fiber and steel bar reinforced effect: rubber powder particle in the waste asphalt reclaiming agent and fiber composition play the effect of putting more energy in pitch and asphalt, thicken asphalt membrane, improve bituminous elasticity, high-temperature stability and low-temperature cracking-resistance.
6) carbon black in the waste asphalt reclaiming agent can be dispersed in (dispersion-strengthened action) in the asphalt membrane fully, forms the component that pitch is formed in pitch, and is matrix with pitch, forms the micro dispersion structure.
Waste asphalt reclaiming agent provided by the invention can stably stored, be used for the regeneration of waste asphalt pavement, both can be mixed and made into regeneration asphalt with the waste asphalt heating of reclaiming, also can directly heat and make hot-mix asphalt mixture with the waste and old pavement asphalt compound that reclaims (add virgin material in case of necessity and adjust grating), pitch after the regeneration or performance of asphalt mixture can reach the level of modifying asphalt or modified asphalt mixture, thereby have improved the work-ing life of bituminous pavement.This waste asphalt reclaiming agent also can directly be used as rubber modified asphalt and use.Volume was 0.02～1.5% of a waste asphalt mixture quality when this waste asphalt reclaiming agent was used to regenerate, and specifically determined according to the specification of quality of waste asphalt mixture asphalt content and regeneration back pitch or asphalt.
Utilize the regenerated waste asphalt mixture composite with new asphalt, saved the new pitch 50% or more and newly gather materials, the performance that makes compound is above heavy traffic paving asphalt, even reaches the effect performance of SBS modifying asphalt.Realized that waste Crumb rubber and useless asphalt fully utilize simultaneously.Reduce and plough, raw-material waste, the protection environment reduces or eliminates the permanent pollution to environment of waste asphalt mixture and junked tire, has the green ecological of advocating, the characteristics of energy-saving and emission-reduction and Sustainable development.
The invention has the beneficial effects as follows:
(1) production cost of waste asphalt reclaiming agent low (less than 3500 yuan/t).
(2) give up with useless supporting, the used waste Crumb rubber of the present invention is the fine powder behind junked tire fragmentation, the grinding, has the green ecological of advocating, the characteristic of waste recycling.
(3) the waste asphalt reclaiming agent consumption is low, and the waste asphalt reclaiming agent consumption accounts for 0.02～1.5% of waste asphalt mixture consumption (quality), thereby reduces waste asphalt mixture regeneration expense.
(4) this method technology is simple.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention is not restricted to following embodiment.
The present invention is respond well through the indoor a large amount of evidences in laboratory.Test according to " highway engineering pitch and asphalt testing regulation " (JTJ052-2000), technical indicator is carried out according to " asphalt highway construction technique normalizing " JTG F40-2004 contrast.
Embodiment 1:
Waste asphalt reclaiming agent, it is formed by 80 order waste Crumb rubbers, heavy traffic paving asphalt, amyl phthalate, Sasobit (husky rope Bhide asphalt modifier) and tar resin feedstock production, and each raw material consumption is as follows:
80 order waste Crumb rubber 75g;
Heavy traffic paving asphalt 410g;
Amyl phthalate 3g;
Sasobit 8.5g；
Tar resin 19g.
The preparation method of above-mentioned waste asphalt reclaiming agent, it comprises the steps:
1) by each raw material consumption: heavy traffic paving asphalt 410g, 80 order waste Crumb rubber 75g, amyl phthalate 3g, Saiobit 8.5g, tar resin 19g, choose 80 order waste Crumb rubbers, heavy traffic paving asphalt, amyl phthalate, Sasobit and tar resin raw material, standby;
2) heavy traffic paving asphalt is warmed to 160 ℃, 80 order waste Crumb rubbers is put in the heavy traffic paving asphalt that has melted, behind the stirring at low speed 1h, drop into amyl phthalate, Sasobit and tar resin, behind the high speed shear 2h, be cooled to normal temperature, obtain waste asphalt reclaiming agent A.
At high temperature miscible waste asphalt reclaiming agent A of the present invention with the useless pitch that from waste material, reclaims, waste asphalt reclaiming agent A volume is 12% (accounting for regenerator and useless pitch total mass), make regeneration asphalt A, the useless pitch index of aged is to such as table 1 before technical indicator and the regeneration.
Waste asphalt mixture is dropped into agitator kettle in baking under 140～190 ℃ after 3～5 hours, add waste asphalt reclaiming agent A, waste asphalt reclaiming agent A accounts for 1% of waste asphalt mixture quality, behind the mix 100s, add and newly gather materials and new pitch continuation stirring 90s, the quality of newly gathering materials and the mass ratio of old asphalt mixture are 40:60, and new bituminous volume decide by best bitumen aggregate ratio, the new pitch volume of this example be newly gather materials 4.4%.Whole test guarantees that all mixture gradation is AC-16C; and application state creates AH-70 and the new pitch of SBS is done the compound simultaneous test; its measurement result sees Table 2; as shown in Table 2; regenerating mixture satisfies " asphalt highway construction technique normalizing " JTG F40-2004 requirement fully, and performance surpasses AH-70 bituminous effect.
Embodiment 2:
Waste asphalt reclaiming agent, it is formed by 40 order waste Crumb rubbers, heavy traffic paving asphalt, diatomite, acrylate and Gum Rosin feedstock production, and each raw material consumption is as follows:
40 order waste Crumb rubber 50g;
Heavy traffic paving asphalt 425g;
Diatomite 21g;
Acrylate 4g;
Gum Rosin 12g.
The preparation method of above-mentioned waste asphalt reclaiming agent, it comprises the steps:
1) by each raw material consumption: 40 order waste Crumb rubber 50g, heavy traffic paving asphalt 425g, diatomite 21g, acrylate 4g, Gum Rosin 12g, choose 40 order waste Crumb rubbers, heavy traffic paving asphalt, diatomite, acrylate and Gum Rosin raw material, standby;
2) heavy traffic paving asphalt is warmed to 160 ℃, 40 order waste Crumb rubbers is put in the heavy traffic paving asphalt that has melted, behind the stirring at low speed 1h, drop into diatomite, acrylate and Gum Rosin, behind the high speed shear 2h, be cooled to normal temperature, obtain waste asphalt reclaiming agent B.
At high temperature miscible waste asphalt reclaiming agent B of the present invention with the useless pitch that from waste material, reclaims, the regenerator volume is 10% (accounting for regenerator and useless pitch total mass), make regeneration asphalt B, the useless pitch index of aged is to such as table 1 before technical indicator and the regeneration.
Waste asphalt mixture drops into agitator kettle in baking under 140～190 ℃ after 3～5 hours, add waste asphalt reclaiming agent B, waste asphalt reclaiming agent B accounts for 1.2% of waste asphalt mixture quality, behind the mix 100s, add and newly gather materials and new pitch continuation stirring 90s, the quality of newly gathering materials and the mass ratio of old asphalt mixture are 50:50, and new bituminous volume decide by best bitumen aggregate ratio, the new pitch volume of this example be newly gather materials 4.5%.Guarantee in the whole test that mixture gradation is AC16C; and application state creates AH-70 and the new pitch of SBS is done the compound simultaneous test; its measurement result sees Table 2; as shown in Table 2; regenerating mixture satisfies " asphalt highway construction technique normalizing " JTG F402004 requirement fully; performance surpasses AH-70 bituminous effect, and is very approaching with SBS modifying asphalt effect.
Embodiment 3:
Waste asphalt reclaiming agent, it is formed by 200 order waste Crumb rubbers, heavy traffic paving asphalt, N-ethanoyl-L-tyrosine amine, calcium chloride and aromatic hydrocarbon oil feedstock production, and each raw material consumption is as follows:
200 order waste Crumb rubber 90g;
Heavy traffic paving asphalt 380g;
N-ethanoyl-L-tyrosine amine 20g;
Calcium chloride 11.5g;
Aromatic hydrocarbon oil 30g.
The preparation method of above-mentioned waste asphalt reclaiming agent, it comprises the steps:
1) by each raw material consumption: 200 order waste Crumb rubbers, 90g, heavy traffic paving asphalt, 380g, N-ethanoyl-L-tyrosine amine, 20g, calcium chloride, 11.5g, aromatic hydrocarbon oil, 30g, choose 200 order waste Crumb rubbers, heavy traffic paving asphalt, N-ethanoyl L-tyrosine amine, calcium chloride and aromatic hydrocarbon oil raw material, standby;
2) heavy traffic paving asphalt is warmed to 160 ℃, 200 order waste Crumb rubbers is put in the heavy traffic paving asphalt that has melted, behind the stirring at low speed 1h; drop into N-ethanoyl-L-tyrosine amine, calcium chloride and aromatic hydrocarbon oil; behind the high speed shear 2h, be cooled to normal temperature, obtain waste asphalt reclaiming agent C.
At high temperature miscible with the useless pitch that reclaims from waste material regenerator C of the present invention, the regenerator volume is 15% (accounting for regenerator and useless pitch total mass), makes regeneration asphalt C, the technical indicator and the useless pitch index contrast table 1 of preceding aged of not regenerating.
Waste asphalt mixture drops into agitator kettle in baking under 140～190 ℃ after 3～5 hours, add waste asphalt reclaiming agent C, waste asphalt reclaiming agent C accounts for 0.8% of waste asphalt mixture quality, behind the mix 100s, the quality of newly gathering materials and the mass ratio of old asphalt mixture are 60:40, new bituminous volume decide by best bitumen aggregate ratio, the new pitch volume of this example be newly gather materials 4.4%.Whole test guarantees that all mixture gradation is AC-16C; and application state creates AH-70 and the new pitch of SBS is done the compound simultaneous test; its measurement result sees Table 2; as shown in Table 2; regenerating mixture satisfies " asphalt highway construction technique normalizing " JTG F40-2004 requirement fully; performance surpasses AH-70 bituminous effect, and is very approaching with SBS modifying asphalt effect.
The technical indicator of each regeneration asphalt of table 1 and waste asphalt
The test-results of table 2 regenerator in compound
Embodiment 4:
Waste asphalt reclaiming agent, it forms by comprising waste Crumb rubber, heavy traffic paving asphalt, antiaging agent, stablizer and solubilizing agent feedstock production; The shared parts by weight of each raw material are:
10 parts of waste Crumb rubbers;
60 parts of heavy traffic paving asphalts;
1 part of antiaging agent;
0.01 part of stablizer;
0.1 part of solubilizing agent;
To be waste tire of automobile become fineness through broken, grinding to described waste Crumb rubber is 20 purpose rubber powders; Described antiaging agent is 2,6-di-t-butyl-4 methylphenol; Described stablizer is an acrylate; Described solubilizing agent is aromatic hydrocarbon oil;
The preparation method of above-mentioned waste asphalt reclaiming agent, it comprises the steps:
1) by the shared parts by weight of each raw material is: 10 parts of waste Crumb rubbers; 60 parts of heavy traffic paving asphalts; 1 part of antiaging agent; 0.01 part of stablizer; 0.1 part of solubilizing agent is chosen waste Crumb rubber, heavy traffic paving asphalt, antiaging agent, stablizer and solubilizing agent raw material, and is standby;
2) heavy traffic paving asphalt is warmed to 140 ℃, waste Crumb rubber is put in the heavy traffic paving asphalt that has melted, behind the stirring at low speed 0.5h, drop into antiaging agent, stablizer and solubilizing agent, behind the high speed shear 0.5h, be cooled to normal temperature, obtain waste asphalt reclaiming agent.
Embodiment 5:
Waste asphalt reclaiming agent, it forms by comprising waste Crumb rubber, heavy traffic paving asphalt, antiaging agent, stablizer and solubilizing agent feedstock production; The shared parts by weight of each raw material are:
40 parts of waste Crumb rubbers;
90 parts of heavy traffic paving asphalts;
3 parts of antiaging agents;
10 parts of stablizers;
25 parts of solubilizing agent;
To be waste tire of automobile become fineness through broken, grinding to described waste Crumb rubber is 200 purpose rubber powders; Described antiaging agent is p-Nitroaniline, amyl phthalate and wilkinite, and N-methyl-p-nitroaniline, amyl phthalate and wilkinite respectively account for 1 part; Described stablizer is acrylate and calcium chloride, and acrylate and calcium chloride respectively account for 5 parts; Described solubilizing agent is aromatic hydrocarbon oil, naphthenic oil, Gum Rosin, divinyl and methylethylketone, and aromatic hydrocarbon oil, naphthenic oil, Gum Rosin, divinyl and methylethylketone respectively account for 5 parts;
The preparation method of waste asphalt reclaiming agent, it comprises the steps:
1) by the shared parts by weight of each raw material is: 40 parts of waste Crumb rubbers; 90 parts of heavy traffic paving asphalts; 3 parts of antiaging agents; 10 parts of stablizers; 25 parts of solubilizing agent are chosen waste Crumb rubber, heavy traffic paving asphalt, antiaging agent, stablizer and solubilizing agent raw material, and are standby;
2) heavy traffic paving asphalt is warmed to 190 ℃, waste Crumb rubber is put in the heavy traffic paving asphalt that has melted, behind the stirring at low speed 2h, drop into antiaging agent, stablizer and solubilizing agent, behind the high speed shear 3h, be cooled to normal temperature, obtain waste asphalt reclaiming agent.
Each cited raw material of the present invention can both be realized the present invention, the bound value of each raw material with and interval value can both realize the present invention, do not enumerate embodiment one by one at this; The bound value of processing parameter of the present invention (as temperature, time etc.) with and interval value can both realize the present invention, do not enumerate embodiment one by one at this.
Claims (8)
1. waste asphalt reclaiming agent is characterized in that it forms by comprising waste Crumb rubber, heavy traffic paving asphalt, antiaging agent, stablizer and solubilizing agent feedstock production; The shared parts by weight of each raw material are:
10～40 parts of waste Crumb rubbers;
60～90 parts of heavy traffic paving asphalts;
0～5 part of antiaging agent;
0.01～10 part of stablizer;
0.1～25 part of solubilizing agent.
2. according to right 1 described waste asphalt reclaiming agent, it is characterized in that: to be waste tire of automobile become fineness through broken, grinding to described waste Crumb rubber is 20～200 purpose rubber powders.
3. according to right 1 described waste asphalt reclaiming agent; it is characterized in that: described antiaging agent is 2; in 6-di-t-butyl-4 methylphenol, N-ethanoyl-L-tyrosine amine, p-Nitroaniline, amyl phthalate, diatomite, the wilkinite any one or any mixing more than two kinds, any is any proportioning when mixing more than two kinds.
4. according to right 1 described waste asphalt reclaiming agent, it is characterized in that: described stablizer is any one or any mixing more than two kinds in acrylate, husky rope Bhide asphalt modifier, the metal chloride, and any is any proportioning when mixing more than two kinds.
5. according to right 4 described waste asphalt reclaiming agents, it is characterized in that: described metal chloride is any one or any mixing more than two kinds in calcium chloride, sodium-chlor, the iron(ic) chloride, and any is any proportioning when mixing more than two kinds.
6. according to right 1 described waste asphalt reclaiming agent, it is characterized in that: described solubilizing agent is any one or any mixing more than two kinds in aromatic hydrocarbon oil, naphthenic oil, tar resin, Gum Rosin, divinyl, the methylethylketone, and any is any proportioning when mixing more than two kinds.
7. according to right 1 described waste asphalt reclaiming agent, it is characterized in that: the shared parts by weight of antiaging agent are 1～3 part.
8. as the preparation method of right 1 described waste asphalt reclaiming agent, it is characterized in that it comprises the steps:
1) by the shared parts by weight of each raw material is: 10～40 parts of waste Crumb rubbers; 60～90 parts of heavy traffic paving asphalts; 0～5 part of antiaging agent; 0.01～10 part of stablizer; 0.1～25 part of solubilizing agent is chosen waste Crumb rubber, heavy traffic paving asphalt, antiaging agent, stablizer and solubilizing agent raw material, and is standby;
2) heavy traffic paving asphalt is warmed to 140～190 ℃, waste Crumb rubber is put in the heavy traffic paving asphalt that has melted, stir 0.5～2h after, drop into antiaging agent, stablizer and solubilizing agent, shear 0.5～3h after, cooling obtains waste asphalt reclaiming agent.
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2009
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