CN102964857B - Modified asphalt made from radiation waste tire rubber powder and preparation method thereof - Google Patents
Modified asphalt made from radiation waste tire rubber powder and preparation method thereof Download PDFInfo
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Abstract
The invention provides modified asphalt made from radiation waste tire rubber powder and a preparation method thereof. The modified asphalt comprises the following components in percentage by weight: 20-40% of the radiation waste tire rubber powder, 40-80% of matrix asphalt, 0-25% of accelerator and 0-10% of polymer. For the preparation method, radiation, chemical and physical methods are adopted, wherein the radiation method is used to activate the 40-80-mesh waste tire rubber powder through radiation by using an electron accelerator or a cobalt source at the dose of 0.5-40KGy; the chemical method is used to carry out chemical degradation, chemical cross-linking and the like on the accelerator, the polymer, the radiation waste tire rubber powder and the matrix asphalt under the actions of heating, stirring and shearing; and the physical method comprises the manners such as stirring, high-speed shearing, and composite stirring/high-speed shearing. The modified asphalt disclosed by the invention has better elasticity, high low-temperature performance and storage stability, and is suitable for the pavement, treatment and repair of highways of various grades as well as the manufacturing of waterproof coils for roofs, basements, bridge opening and the like, and the preparation method is simple and is low in material consumption and pollution.
Description
Technical field
The present invention relates to a kind of irradiation asphalt by modification of waste tyre rubber powder and preparation method thereof, belong to asphalt modification technical field.
Background technology
China is rubber country of consumption maximum in the world, is also simultaneously the maximum country of waste rubber output, causes the serious wasting of resources and " black pollution ".China's waste rubber utilizes mainly based on tyre rebuilding, and wherein regenerated rubber ranks first in the world, but the energy consumption in production process of reclaimed rubber is high, it is large to pollute, in recent years by International Environmental Protection mechanism is criticized, and the industry of Ye Shi China restriction.
Waste rubber tyre powder is that (comprise bias tyre, radial, hand cart tyre, hand cart tyre refers to bicycle tyre and tube, walkie fork lift truck Tire & Tube, motorcycle Tire & Tube, multi-usage tire etc. to junked tire.) etc. waste and old sizing material through physical and chemical processes such as pulverizing, heating, mechanical treatments, make its from elastic stage become have plasticity and elastic, can the regenerated rubber powder of revulcanization.China's tire vulcanizing and recycle association, according to the junked tire condition of production, are divided three classes: more than thick rubber powder 0.425mm(40 order); Thin rubber powder 0.425-0.180mm(40-80 order); Micro glue powder 0.180-0.075mm(80-200 order), their main chemical compositions is natural rubber and synthetic rubber, also has the additives such as sulphur, sulphur, carbon black, oxygenant, ferric oxide in addition.These compositions are all the good properties-correcting agent of pitch above, can improve pitch high temperature performance, ageing resistance, anti-fatigue performance, increase the service life; The cohesiveness with base-material can be increased for road, improve anti-skid wearable, increase the service life; For building trade, as waterproof roll, waterproofing unction can reduce costs, obtain higher product profit.Therefore, the research of asphalt by modification of waste tyre rubber powder compound at improving technology, increase economic efficiency, be all of great importance in environment protection.
The technological difficulties of asphalt by modification of waste tyre rubber powder are: the system that waste rubber tyre powder and matrix pitch are formed belongs to thermodynamic unstable system, and in practical application, require that waste rubber tyre powder is dispersed in pitch, form thermodynamic stable system, play waste rubber tyre powder to the modifying function of pitch, obtain the modifying asphalt goods of excellent property.In reality, because molecular weight and chemical structure there are differences, waste rubber tyre powder and bitumen compatibility poor, easily segregation, layering, affect the performance of pitch and actual use.Pitch and waste rubber tyre powder will realize compatible, the rubber powder perfect condition be distributed in pitch is segmentation cloth instead of dissolves completely, namely the insoluble and even macroscopic state of microcosmic is in, at this moment, waste rubber tyre powder particle is thin and be evenly distributed in pitch, along with consistency increases, modifying asphalt temperature susceptibility improves, and resistance toheat strengthens; In addition, consistency is well also the prerequisite improving pitch low-temperature performance, and swelling and local dissolution occurs the system waste rubber tyre powder that consistency is good, forms continuous print reticulated structure.
The stability of waste rubber tyre powder-asphalt system main and asphalt source, waste rubber tyre powder composition and size, specific surface area size, surface active groups content, processing treatment temperature, time, stirring/shearing resistance etc. have much relations.Prior art carried out much useful research in related fields, and in processing treatment, large-scale, the specialized equipment equipment of many employings, is applicable to scale operation, but expensive, and energy consumption is high; In waste rubber tyre powder process, adopt increases waste rubber tyre powder order number or chemical process more, and increasing rubber powder order number needs special main equipment, and production capacity is large, but instrument price is expensive, and energy consumption is high, pollutes large; Chemical process needs the effect using a large amount of chemical, intensification, mechanical force, causes cost to increase, and venomous injurant pollutes.
Summary of the invention
For the asphalt by modification of waste tyre rubber powder technological difficulties of the market requirement and outwardness, the invention reside in and a kind of activation waste rubber tyre powder through rumbatron or cobalt-60 radiosterilize is provided, and select the materials such as suitable polymer to prepare one there is good high temperature performance, stable storing, preparation technology is simple, be suitable for the asphalt by modification of waste tyre rubber powder produced in enormous quantities, and the preparation method of this asphalt by modification of waste tyre rubber powder.
The technical solution used in the present invention is as follows:
Irradiation asphalt by modification of waste tyre rubber powder provided by the invention, be made up of irradiation waste rubber tyre powder, matrix pitch, promotor, polymkeric substance, its component is by weight percentage: irradiation waste rubber tyre powder 20-40%, matrix pitch 40-80%, promotor 0-25%, polymkeric substance 0-10%.
Wherein, above-mentioned irradiation waste rubber tyre powder is waste rubber tyre powder or the waste rubber tyre powder being added with the grafted monomer acrylamide accounting for waste rubber tyre powder weight 1%, the surface after rumbatron or cobalt source 0.5-40KGy dose delivery is fluffy, specific surface area increases, with polar group or free radical, can be better compatible with matrix pitch activation waste rubber tyre powder.
Wherein, above-mentioned waste rubber tyre powder is the mixing of one or more in discarded bias tyre, radial, hand cart tyre, and decon after normal temperature or pulverize at low temperature gets the thin rubber powder of its 40-80 order part.
Wherein, above-mentioned matrix pitch is the mixing of one or more in decompression pitch, mediation pitch, straight-run pitch;
Penetration degree during matrix pitch 25 DEG C is 40-120 1/10mm, and softening temperature is 40-55 DEG C.
Wherein, above-mentioned promotor is the combination of one or more in aromatic hydrocarbon oil, Yatall MA, deasphalted oil, prioritizing selection aromatic hydrocarbon oil.
Wherein, above-mentioned polymkeric substance is the combination of one or more in styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene copolymer (SBR), polyolefine, grafting SBS, prioritizing selection SBS.
The preparation method of a kind of irradiation asphalt by modification of waste tyre rubber powder provided by the invention, adopts following steps:
1) irradiation waste rubber tyre powder is prepared
Select 40-80 order waste rubber tyre powder, or be added with the waste rubber tyre powder of the grafted monomer acrylamide accounting for waste rubber tyre powder weight 1%, with rumbatron or cobalt source 0.5-40KGy dose delivery, the activation waste rubber tyre powder after obtained irradiation;
2) by matrix pitch heat fused at 70-180 DEG C;
3) irradiation waste rubber tyre powder obtained for step 1) and promotor, polymkeric substance are added to step 2) in the matrix pitch that processes, mixing;
4) by step 3) mix after mixture at 80-180 DEG C of temperature, 100-200 rev/min of mechanical stirring 120-210 minute; Or 5000-6000 rev/min of high speed shear 40-50 minute; Or 100-200 rev/min mechanical stirring 40-50 minute, 5000-6000 rev/min high speed shear 10-20 minute, 100-200 rev/min of machinery stirs 40-50 minute;
5) irradiation asphalt by modification of waste tyre rubber powder goods are obtained.
Wherein, above-mentioned steps 2) mesostroma asphalt heating temperature of fusion is preferably 70-140 DEG C, and the temperature range of step 4) is preferably 120-180 DEG C.
Preparation method of the present invention have employed irradiation, chemistry and physical method, and irradiance method is through rumbatron or the activation of cobalt source 0.5-40KGy dose delivery by 40-80 order waste rubber tyre powder; Chemical process refers to promotor, polymkeric substance, irradiation waste rubber tyre powder, the chemical degradation, chemically crosslinked etc. of matrix pitch under heating, stirring, shearing action; Physical method is stirring, high speed shear, composite stirring/high speed shear.
The present invention is in waste rubber tyre powder process, and adopt irradiance method activation waste rubber tyre powder, namely adopt when irradiation dose is identical, the arbitrary device irradiation of the rumbatron that irradiation effect is equal or cobalt source, obtains the activation waste rubber tyre powder of better performances; Irradiation process is decomposed without chemical contamination, unharmful substance, is remained without irradiation.
The present invention is in processing treatment, according to each component percentage composition, system processing characteristics, suitable application of sample temperature is selected within the scope of 70-180 DEG C, suitable processing temperature scope is selected within the scope of 80-180 DEG C, suitable process period is selected in 120-210 minute, 100-200 rev/min of mechanical stirring, 5000-6000 rev/min of high speed shear, suitable alr mode is selected in compound 100-200 rev/min of mechanical stirring, 5000-6000 rev/min high speed shear, make each component be scattered in matrix pitch preferably, obtain the modifying asphalt matter goods of better performances.
In a kind of irradiation asphalt by modification of waste tyre rubber powder provided by the invention and preparation method thereof, the technological standard of modifying asphalt goods is whole bitumen technology cores, and core index mainly contains penetration degree, softening temperature, thermotolerance, segregability, low-temperature tenderness, elastic recovery rate etc.Asphalt by modification of waste tyre rubber powder goods prepared by the present invention are according to standard GB/T 18242-2008, and building material industry standard JC/T905-2002 prescriptive procedure measures These parameters.
Beneficial effect of the present invention is:
1, waste rubber tyre powder or the waste rubber tyre powder containing grafted monomer acrylamide, after rumbatron or cobalt source 0.5-40KGy dose delivery, fluffy, the specific surface area in surface increase and with polar group or free radical, can be better compatible with matrix pitch, form high temperature performance, modifying asphalt goods that stability in storage is good.This activation method avoids and uses the harm that in chemical activation method, chemical reagent brings, and uses plant and instrument costliness, high energy consumption, high pollution problem that thermo-cracking activation method brings.
2, in the preparation method of irradiation asphalt by modification of waste tyre rubber powder, during application of sample, promotor, irradiation waste rubber tyre powder, polymkeric substance is added as early as possible after asphalt melting, avoid pitch lightweight component and aromatic hydrocarbon oil volatilization to greatest extent, be conducive to waste rubber tyre powder, polymkeric substance fully swelling in pitch, formed evenly with pitch, stabilising system.
3, the modifying asphalt goods prepared of the present invention, softening temperature (DEG C) is up to 130, low-temperature tenderness (DEG C) is minimum reaches-35 DEG C, segregability (163 DEG C
5 DEG C, 24h): upper and lower softening temperature velocity of variation is less than 8%, elastic restoration ratio (25 DEG C): be greater than 97%, have good elasticity, high temperature performance, package stability; And preparation technology is simple, easily realizes.
Embodiment
Asphalt by modification of waste tyre rubber powder that the present invention relates to and preparation method thereof, further illustrates in conjunction with the embodiments, but these embodiments should not be regarded as the restriction as scope.
Concrete steps are as follows:
1, irradiation waste rubber tyre powder is prepared
Select 40-80 order waste rubber tyre powder, or be added with the waste rubber tyre powder of the grafted monomer acrylamide accounting for waste rubber tyre powder weight 1%, with rumbatron or cobalt source 0.5-40KGy dose delivery, the activation waste rubber tyre powder after obtained irradiation.
2, irradiation asphalt by modification of waste tyre rubber powder goods are prepared
Irradiation waste rubber tyre powder, promotor, polymkeric substance are joined in the matrix pitch of heat fused at 70-180 DEG C,
Mixing; At 80-180 DEG C of temperature, 100-200 rev/min of mechanical stirring 120-210 minute; Or 5000-6000 rev/min of high speed shear 40-50 minute; Or 100-200 rev/min mechanical stirring 40-50 minute, 5000-6000 rev/min high speed shear 10-20 minute, 100-200 rev/min of machinery stirs 40-50 minute; Obtain irradiation asphalt by modification of waste tyre rubber powder goods.
3, irradiation asphalt by modification of waste tyre rubber powder product properties index is tested
According to People's Republic of China (PRC) building material industry standard JC/T905-2002 " elastomer modified asphalt " and National Standard of the People's Republic of China GB/T328.11, the test method of regulation in GB/T328.14 " building waterproof coil test method ", the index such as softening temperature, thermotolerance, segregability, low-temperature tenderness, penetration degree, elastic restoration ratio of irradiation asphalt by modification of waste tyre rubber powder goods prepared by test the present invention, the performance of comprehensive evaluation modifying asphalt goods.
embodiment 1
In 70
5 DEG C of Qinhuangdao 90
#25% aromatic hydrocarbon oil is added, 60 order waste rubber tyre powders of 10%SBS, 27% 0.5KGy dosage cobalt-60 radiosterilize, 120-160 DEG C, 150 in pitch
10 revs/min of stirring reactions 210
5 minutes, prepare asphalt by modification of waste tyre rubber powder goods; Its softening temperature is tested, low-temperature tenderness, penetration degree, thermotolerance, segregability, elastic restoration ratio by standard method.Experimental result shows: softening temperature (DEG C): 130.0; Low-temperature tenderness (DEG C) :-35; Penetration degree (25 DEG C, 0.1mm): 74.9; Thermotolerance (DEG C): 125; Segregability (163
5 DEG C, 24h): upper and lower layer softening temperature velocity of variation (%): 0.02; Elastic restoration ratio (25 DEG C, %): 98.
embodiment 2
In 110
5 DEG C of Qinhuangdao 90
#25% fragrance point oil is added, 7%SBS, 27% 1KGy dosage cobalt-60 radiosterilize in pitch, containing the 60 order waste rubber tyre powders accounting for waste rubber tyre powder content 1% acrylamide, 100-140 DEG C, 200
10 revs/min of stirring reactions 180
10 minutes, prepare asphalt by modification of waste tyre rubber powder goods; Its softening temperature is tested, low-temperature tenderness, penetration degree, thermotolerance, segregability, elastic restoration ratio by standard method.Experimental result shows: softening temperature (DEG C): 110.9; Low-temperature tenderness (DEG C) :-35; Penetration degree (25 DEG C, 0.1mm): 84.1; Thermotolerance (DEG C): 115; Segregability (163
5 DEG C, 24h): upper and lower layer softening temperature velocity of variation (%): 4.8; Elastic restoration ratio (25 DEG C, %): 98.
embodiment 3
In 140
5 DEG C of Qinhuangdao 90
#20% fragrance point oil is added, 5%SBS, 27% 10KGy dosage cobalt-60 radiosterilize 40 order waste rubber tyre powder, 140-180 DEG C, 100 in pitch
10 revs/min of stirring reactions 210
5 minutes, prepare asphalt by modification of waste tyre rubber powder goods; Its softening temperature is tested, low-temperature tenderness, penetration degree, thermotolerance, segregability, elastic restoration ratio by standard method.Experimental result shows: softening temperature (DEG C): 127.7; Low-temperature tenderness (DEG C) :-35; Penetration degree (25 DEG C, 0.1mm): 74.6; Thermotolerance (DEG C): 120; Segregability (163
5 DEG C, 24h): upper and lower layer softening temperature velocity of variation (%): 3.5; Elastic restoration ratio (25 DEG C, %): 98.
embodiment 4
In 160
sea 60 in 5 DEG C
#20% aromatic hydrocarbon oil is added, 80 order waste rubber tyre powders of 40% cobalt source 40KGy dose delivery, 160-180 DEG C, 5000 revs/min high speed shear 55 in pitch
5 minutes, prepare asphalt by modification of waste tyre rubber powder goods; Its softening temperature is tested, low-temperature tenderness, penetration degree, thermotolerance, segregability, elastic restoration ratio by standard method.Experimental result shows: softening temperature (DEG C): 93.2; Low-temperature tenderness (DEG C) :-25; Penetration degree (25 DEG C, 0.1mm): 83.5; Thermotolerance (DEG C): 90; Segregability (163
5 DEG C, 24h): upper and lower layer softening temperature velocity of variation (%): 6.7; Elastic restoration ratio (25 DEG C, %): 97.
embodiment 5
In 180
sea 60 in 5 DEG C
#40 order waste rubber tyre powders of 5% aromatic hydrocarbon oil, 30% cobalt source 10KGy dose delivery are added, 160-180 DEG C, 150 in pitch
10 revs/min of stirring reactions 150
5 minutes, prepare asphalt by modification of waste tyre rubber powder goods; Its softening temperature is tested, low-temperature tenderness, penetration degree, thermotolerance, segregability, elastic restoration ratio by standard method.Experimental result shows: softening temperature (DEG C): 100.0; Low-temperature tenderness (DEG C) :-8; Penetration degree (25 DEG C, 0.1mm): 47.3; Thermotolerance (DEG C): 95; Segregability (163
5 DEG C, 24h): upper and lower layer softening temperature velocity of variation (%): 4.3; Elastic restoration ratio (25 DEG C, %): 97.
embodiment 6
In 100
5 DEG C of Qinhuangdao 90
#10% fragrance point oil is added, 3%SBS, 27% 40KGy dosage cobalt-60 radiosterilize 80 order waste rubber tyre powder, 120-160 DEG C, 120 in pitch
10 revs/min of stirring reactions 120
5 minutes, prepare asphalt by modification of waste tyre rubber powder goods; Its softening temperature is tested, low-temperature tenderness, penetration degree, thermotolerance, segregability, elastic restoration ratio by standard method.Experimental result shows: softening temperature (DEG C): 107.4; Low-temperature tenderness (DEG C) :-25; Penetration degree (25 DEG C, 0.1mm): 70.1; Thermotolerance (DEG C): 105; Segregability (163
5 DEG C, 24h): upper and lower layer softening temperature velocity of variation (%): 3.7; Elastic restoration ratio (25 DEG C, %): 97.
embodiment 7
In 120
5 DEG C of Qinhuangdao 90
#25% fragrance point oil is added, 7%SBS, 30% 40KGy dosage cobalt-60 radiosterilize 40 order waste rubber tyre powder, 150-180 DEG C, 160 in pitch
10 revs/min of stirring reactions 210
5 minutes, prepare asphalt by modification of waste tyre rubber powder goods; Its softening temperature is tested, low-temperature tenderness, penetration degree, thermotolerance, segregability, elastic restoration ratio by standard method.Experimental result shows: softening temperature (DEG C): 117.4; Low-temperature tenderness (DEG C) :-32; Penetration degree (25 DEG C, 0.1mm): 79.2; Thermotolerance (DEG C): 115; Segregability (163
5 DEG C, 24h): upper and lower layer softening temperature velocity of variation (%): 3.5; Elastic restoration ratio (25 DEG C, %): 100.
embodiment 8
In 140
5 DEG C of Qinhuangdao 90
#10% aromatic hydrocarbon oil is added, 60 order waste rubber tyre powders of 30% rumbatron 10KGy dose delivery, 140-180 DEG C, 150 in pitch
10 revs/min of mechanical stirring 45
5 minutes, 5000 revs/min of high speed shear 15
5 minutes, 150
10 revs/min of mechanical stirring 45
5 minutes, prepare asphalt by modification of waste tyre rubber powder goods; Its softening temperature is tested, low-temperature tenderness, penetration degree, thermotolerance, segregability, elastic restoration ratio by standard method.Experimental result shows: softening temperature (DEG C): 86.9; Low-temperature tenderness (DEG C) :-12; Penetration degree (25 DEG C, 0.1mm): 65.1; Thermotolerance (DEG C): 85; Segregability (163
5 DEG C, 24h): upper and lower layer softening temperature velocity of variation (%): 1.3; Elastic restoration ratio (25 DEG C, %): 97.
embodiment 9
In 80
sea 60 in 5 DEG C
#60 order waste rubber tyre powders of 20% rumbatron 1KGy dose delivery are added, 80-140 DEG C, 6000 revs/min high speed shear 55 in pitch
5 minutes, prepare asphalt by modification of waste tyre rubber powder goods; Its softening temperature is tested, low-temperature tenderness, penetration degree, thermotolerance, segregability, elastic restoration ratio by standard method.Experimental result shows: softening temperature (DEG C): 71.6; Low-temperature tenderness (DEG C): 4; Penetration degree (25 DEG C, 0.1mm): 24.2; Thermotolerance (DEG C): 70; Segregability (163
5 DEG C, 24h): upper and lower layer softening temperature velocity of variation (%): 7.5; Elastic restoration ratio (25 DEG C, %): 98.
Claims (5)
1. an irradiation asphalt by modification of waste tyre rubber powder, it is characterized in that, described modifying asphalt is made up of irradiation waste rubber tyre powder, matrix pitch, promotor, polymkeric substance, and its component is by weight percentage: irradiation waste rubber tyre powder 20-40%, matrix pitch 40-80%, promotor 5%-25%, polymkeric substance 3%-10%;
Described irradiation waste rubber tyre powder is waste rubber tyre powder or the waste rubber tyre powder being added with the grafted monomer acrylamide accounting for waste rubber tyre powder weight 1%, the surface after rumbatron or cobalt source 0.5-40KGy dose delivery is fluffy, specific surface area increases, with polar group or free radical, can be better compatible with matrix pitch activation waste rubber tyre powder;
Described promotor is the combination of one or more in aromatic hydrocarbon oil, Yatall MA, deasphalted oil;
Described polymkeric substance is the combination of one or more in styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene copolymer (SBR), grafting SBS.
2. by irradiation asphalt by modification of waste tyre rubber powder according to claim 1, it is characterized in that, described waste rubber tyre powder is the mixing of one or more in discarded bias tyre, radial, hand cart tyre, and decon after normal temperature or pulverize at low temperature, gets the thin rubber powder of its 40-80 order part.
3. by irradiation asphalt by modification of waste tyre rubber powder according to claim 1, it is characterized in that, described matrix pitch is the mixing of one or more in decompression pitch, mediation pitch, straight-run pitch; Penetration degree during matrix pitch 25 DEG C is 40-1201/10mm, and softening temperature is 40-55 DEG C.
4. a preparation method for the irradiation asphalt by modification of waste tyre rubber powder as described in claim arbitrary in claims 1 to 3, is characterized in that, adopts following steps:
1) irradiation waste rubber tyre powder is prepared
Select 40-80 order waste rubber tyre powder, or be added with the waste rubber tyre powder of the grafted monomer acrylamide accounting for waste rubber tyre powder weight 1%, with rumbatron or cobalt source 0.5-40KGy dose delivery, the activation waste rubber tyre powder after obtained irradiation;
2) by matrix pitch heat fused at 70-180 DEG C;
3) by step 1) obtained irradiation waste rubber tyre powder and promotor, polymkeric substance be added to step 2) in the matrix pitch that processes, mixing;
4) by step 3) mixing after mixture at 80-180 DEG C of temperature, 100-200 rev/min of mechanical stirring 120-210 minute; Or 5000-6000 rev/min of high speed shear 40-50 minute; Or 100-200 rev/min mechanical stirring 40-50 minute, 5000-6000 rev/min high speed shear 10-20 minute, 100-200 rev/min of mechanical stirring 40-50 minute;
5) irradiation asphalt by modification of waste tyre rubber powder goods are obtained.
5., by the preparation method of irradiation asphalt by modification of waste tyre rubber powder according to claim 4, it is characterized in that, described step 2) in matrix pitch heat fused temperature be 70-140 DEG C, step 4) temperature be 120-180 DEG C.
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| CN201210560551.4A CN102964857B (en) | 2012-12-21 | 2012-12-21 | Modified asphalt made from radiation waste tire rubber powder and preparation method thereof |
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| CN103725022A (en) * | 2013-12-13 | 2014-04-16 | 许昌金欧特沥青股份有限公司 | Spreading type rubber powder modified emulsified asphalt and preparation method thereof |
| CN108276911A (en) * | 2018-02-01 | 2018-07-13 | 四川邑诚科技有限公司 | Macromolecule waterproof adhesive powder, high polymer waterproof material and preparation method thereof |
| CN109946441A (en) * | 2019-03-26 | 2019-06-28 | 长沙理工大学 | A kind of cryogenic property analysis method of processes of rock asphalt modified asphalt |
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| US5385401A (en) * | 1993-10-06 | 1995-01-31 | Cyclean, Inc. | Process for adding recycled tire particle to asphalt |
| CN1257941C (en) * | 2003-09-17 | 2006-05-31 | 西北师范大学 | Composite of modified road asphalt by microwave radiating old rubber powder and its preparation process |
| CN100487010C (en) * | 2007-03-14 | 2009-05-13 | 四川大学 | Grafting modification process of regenerating waste butyl rubber |
| CN101250328A (en) * | 2008-04-10 | 2008-08-27 | 华东理工大学 | Waste and old rubber modified asphalt |
| CN101831184B (en) * | 2010-03-23 | 2012-09-26 | 江汉大学 | Pitch modified from waste tire rubber powder and preparation method thereof |
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