CN103360774A - Asphaltized rubber modified asphalt and preparation method thereof - Google Patents
Asphaltized rubber modified asphalt and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an asphaltized rubber modified asphalt and a preparation method thereof. The asphaltized rubber modified asphalt is composed of the following components in parts by weight: 15-25 parts of asphaltized rubber granule, 0.3-1.0 part of stabilizer and 75-85 parts of matrix asphalt. The asphaltized rubber granule is used as a modifier; and the modifier is composed of the following components in parts by weight: 20-30 parts of petroleum asphalt, 10-15 parts of rock asphalt, 40-60 parts of scrap tire rubber powder, 2-5 parts of plasticizer and 3-6 parts of polyethylene. The modifier disclosed by the invention also has the advantage of improving high/low temperature properties of the asphalt, so that the modified asphalt reaches PG88-28 and has much better properties than other polymer modified asphalts; and the modified asphalt product does not segregate or precipitate, and can be stored in a cold or hot environment for a long time. The conventional technical indexes of the asphalt are better than those of the traditional rubber asphalt; and the invention can greatly simplify the production technique and modification equipment of the rubber modified asphalt, enhance the production efficiency of the modified asphalt, and lower the production cost.
Description
Technical field
The invention belongs to the road engineering field, relate in particular to a kind of bituminous grouting rubber modified asphalt and preparation method.
Background technology
According to statistics, China has 74% damaged tire to become solid pollutant every year, and the junked tire of China in 2011 has reached 200,000,000, and waste rubber reaches 5,200,000 tons.Stack, burn the environmental problem that causes because of junked tire and seriously perplex the environmentalist.In the road engineering field, become effective method with waste old as properties-correcting agent, the rubber asphalt technology also receives much concern with significant environment protection significance with its excellent pavement performance.Practice at home and abroad proves: the rubber asphalt technology is in that to improve the aspect effects such as road surface antifatigue, weather resistance, anti-low-temperature cracking, prevention progress of fracture, noise reduction remarkable, but the anti-rut improved performance of road pavement high temperature is relatively poor.
Main rubber asphalt technology has two large classes at present: dry method and wet method.Dry method is that rubber powder is rendered to batching plant with pitch, mineral aggregate and additive, the direct production rubber-asphalt mixture.Wet method is the rubber asphalt that manufactures a finished product first, and asphalt is produced in regeneration.And performance of asphalt mixture and stability that the latter produces are all better, therefore are widely used.But in finished product rubber asphalt commonly used production and the use procedure, because rubber powder is dispersed undesirable in matrix pitch, usually need the high speed whipping devices such as colloidal mill; The rubber asphalt of situ production needs special production unit, and storage time is shorter, no longer than 3 days, and needs continuously stirring, and temperature remains on 145-155 ℃.On the one hand, the rubber powder pitch of this technology is (17%, massfraction) when the rubber powder volume is large, and asphalt can only adopt gap gradation, and can not be applied to common dense bitumen compound, and cost is high, and utilization ratio is lower.The problems such as on the other hand, this rubber asphalt is faced with high temperature storage and easily emanates, and long-time long distance transportation product segregation is serious.And guarantee that rubber asphalt has the anti-rut performance of better high temperature, usually require the rubber powder volume 17-30% (outside mix, massfraction) between, 180 ℃ of rotary viscosities of the JTT798-2011 of the Ministry of Communications " highway engineering waste rubber tyre powder rubber asphalt " regulation rubber asphalt are not less than 1.5Pa.s, 5 ℃ of ductility minimums are not less than 5cm (hot-zone), namely require the rubber powder volume large, viscosity is high, and low temperature flexibility is good.The technician adopts the composite modified or composite modified situation that realizes this multi-win of rubber powder/rock asphalt of rubber powder/SBS, patent 201210512058.5 relates to a kind of radiactive and branching block copolymer and preparation method thereof, only realize composite modified by simple high-speed shearing machine blend petroleum pitch or the rock asphalt of rubber powder, 1-10 part softening agent and 80-98 part of 1-10 part, softening agent by large volume improves rubber powder plasticity, increases the compatible of itself and pitch.But the method that provides in this patent with rock asphalt or petroleum pitch as dispersion medium, with rubber as disperse phase, it is a kind of traditional rubber modified asphalt method, because its rubber powder volume is little, still need to adopt high-speed shearing machine to grind 80 minutes (180 ℃), production efficiency is lower, and complete processing is complicated.In addition, the consistency of shoddy and pitch is relatively poor, and the volume of the common reduce rubber powder of existing technical staff is even large volume also is no more than 25%.And the in-situ processing of rubber powder is normally added the thin rubber powder of 80-100 purpose or desulfurization rubber powder, the tooling cost that this increases undoubtedly.It is short on-the-spot storage time that the problems referred to above cause the existing technical staff can't solve rubber powder modified asphalt, batch production production efficiency is low, need the problems such as colloidal mill, therefore developing the rubber modified asphalt that the rubber powder volume is large, instant, hot storage stability is good is to expand the efficient beneficial direction that utilizes of shoddy.
Rock asphalt is that a kind of composition is close with petroleum pitch, and asphalt content is larger, is rich in the rock asphalt of certain mineral substance ash content.Advantage receives much concern its modifying asphalt so that easy construction, economical rationality, the anti-rut effect of high temperature be remarkable etc.Patent 201110249447.9 provides a kind of processes of rock asphalt modified asphalt and preparation method thereof, this technology is take the import rock asphalt as raw material, directly in the rock asphalt doped matrix pitch with 5-10 part, but the ductility of 15 ℃ of pitches had decayed to 28.5cm when the volume of rock asphalt reached 10 parts, do not satisfied that 15 ℃ of ductilities of No. 50 C level pitch are greater than the requirement of 30cm among the F40-2004 " standard specification for construction and acceptance of highway asphalt pavement ", namely its low-temperature cracking-resistance is badly damaged.Most researchs point out that the volume of rock asphalt is difficult for surpassing 15% (massfraction), and the too high low temperature flexibility impact on pitch of volume is larger, increase the risk of Asphalt Mixture at Low Temperature cracking.This mainly is that the sedimentation of ash content causes the segregation of modifying asphalt because usually contain the ash content of 15-35% in the rock asphalt.In addition, this patent points out to need not by simple stirring the specific equipment realization rock asphalt modifications such as colloidal mill, but the rock asphalt place of production is different, softening temperature difference is larger, the rock asphalt that softening temperature is lower need not colloidal mill and just can directly be distributed in the pitch, and softening temperature is higher than 150 ℃ superhard rock asphalt difficult, in the patent not the softening point range to rock asphalt describe simple dispersion, the melting problem of the difficult superhard rock asphalt of blending technology in pitch.If levigate rock asphalt is filled in the rubber powder network, to rubber powder modified, then can improve the utilization ratio of rock asphalt, alleviate it because of the problem of the too high loss pitch of consumption low-temperature performance, strengthen simultaneously rubber powder high temperature performance of asphalt is improved effect.
Bituminous grouting rubber grain properties-correcting agent is broken through above-mentioned restriction exactly, realizes the pre-treatment of instant shoddy with wide, the cheap starting material of originating.With rock asphalt, the gilsonite filled rubber of high softening-point, under the effect of the mechanical shear stress of dual-screw-stem machine, rock asphalt and hard pitch are filled in the rubbery system of pre-desulfurization jointly.In the situation of not damaging the characteristics of rubber own, improve rubber powder high temperature performance of asphalt is improved effect; Simultaneously because rock asphalt itself forms close with pitch, when these components are filled in the rubber powder, make solubility parameter and the pitch of rubber powder more approaching, thereby obtain better blend effect when making properties-correcting agent and pitch blend, consistency is better than independent waste Crumb rubber and high softening-point rock asphalt, and realizes instant effect.To sum up, bituminous grouting rubber grain properties-correcting agent and pitch have good consistency, just can fully mix with pitch at 170--180 ℃, need not shearing device, only stir properties-correcting agent is fully disperseed in pitch, make its situ production become possibility.In addition, this technology can increase the adhesivity of modifying asphalt, and stability of asphalt mixture increases, and can be adapted to continuous dense bitumen compound, thereby further increases the utilization ratio of rubber powder.
Summary of the invention
The present invention is directed to existing rubber asphalt improves not obvious to high temperature performance of asphalt, and poor with bitumen compatibility, the rock asphalt modification is to pitch low-temperature performance damage, the problem such as ash content free settling in the rock asphalt, the bituminous grouting rubber grain properties-correcting agent that the exploitation rock asphalt is composite with the rubber powder filling.This product combines the performance of hard pitch and rubber, and the rubber modified bitumen of preparation has good high-temperature behavior and low-temperature performance take it as additive, and production technique is simple, and investment of production equipment is little, and production cost is low, steady quality.
In addition, shear at a high speed the production technique of dispersing apparatus with colloidal mill etc. for existing polymer modified asphalt, production efficiency is low, investment of production equipment is large, and production cost is high, and environmental pollution is serious, the problems such as unstable product quality, instant type rubber modifier is proposed, the rubber modified asphalt that can adopt common whipping device to manufacture a finished product, situ production or batch production are produced and all can.
To achieve these goals, the present invention adopts following technical scheme.
A kind of bituminous grouting rubber modified asphalt, its component are 15-25 part bituminous grouting rubber grain, 0.3-1.0 part stablizer, 75-85 part matrix pitch, parts by weight; Wherein, the bituminous grouting rubber grain is as properties-correcting agent, and the composition of this properties-correcting agent and parts by weight thereof are: 20-30 part petroleum pitch, 10-15 part rock asphalt, 40-60 part waste tire rubber powder, 2-5 part softening agent, 3-6 part polyethylene.
Described matrix pitch is 70# or 90# petroleum pitch.
The present invention also provides a kind of preparation method of bituminous grouting rubber modified asphalt, the concrete preparation flow of modifying asphalt is as follows: (1) is heated to flow state with matrix pitch at suitable thermal source, take by weighing a certain amount of matrix pitch, under 170-180 ℃ of condition, add properties-correcting agent, adopt electric mixer stir about 5-10min, guarantee that properties-correcting agent melts fully; (2) keep temperature-resistant, stablizer is added in the pitch, stir 20-30min, can obtain the bituminous grouting rubber modified asphalt.
Content of modifier is larger, and the asphalt modification effect is more obvious, and asphalt viscosity is larger, and high temperature performance is good; Volume is too large, and the viscosity in the pitch is excessive, causes the bitumen construction workability not good; And volume is too little, and properties-correcting agent is not obvious to the modified effect of pitch, can not obviously give pitch good pavement performance.
The aforementioned stable agent is vulcanizing agent, and consumption is controlled at 0.3-1.0 part, as the linking agent of properties-correcting agent and pitch, increase the rubber modified asphalt stereoeffect and guarantee the stability in storage of product, and be the requisite part of modifying asphalt.
Raw material in the above-mentioned properties-correcting agent has different impacts to the modified effect of properties-correcting agent.Petroleum pitch is the 10# building asphalt, the low grade pitch that a kind of vacuum residuum obtains through pitch oxidation, in the properties-correcting agent preparation process as the liquid phase medium environment, it is the carrier in rubber powder, the rock asphalt powder filling process, and play swelling rubber powder, gluing powder, be easy to the effect of granulation, improve simultaneously the consistency of properties-correcting agent and pitch.Its consumption is difficult for too much, too much affects effective constituent effect performance, can't provide good media environment again very little, and the consistency of properties-correcting agent and pitch is variation thereupon.In addition, the softening temperature of this pitch should be controlled between 90-110 ℃, and softening temperature was difficult for low, crosses to hang down in the properties-correcting agent preparation process to be difficult for granulation; Too high, liquid phase medium is relatively poor to the swelling action of rubber powder, and the properties-correcting agent low-temperature performance is not good.
Rock asphalt is the weighting agent of rubber powder, is the key ingredient that high temperature performance of asphalt improves.Its consumption is more, and is better to the filling effect of rubber molecule, and resulting modifying asphalt high-temperature behavior is better, but consumption is too much, surpasses the consumption of rubber powder, then phase transition can occur, and causes pitch parcel rubber powder, thus the low-temperature performance of damage modifying asphalt.Its consumption also should not be very little, and the filling to rubber powder is incomplete very little, and high-temperature behavior improves not obvious.The softening temperature of rock asphalt is at 150--180 ℃, and softening temperature characterizes the soft or hard degree of pitch, is the characteristic index of evt, softening temperature is difficult for too high, the too high instant effect that affects properties-correcting agent, excessively low high temperature modified effect to its modifying asphalt improves not obvious, therefore should be controlled in the OK range.
Waste tire rubber powder is improving the pitch low temperature flexibility, is improving and have excellent effect aspect the pitch fatigue resistance, and the carbon black in the rubber powder and a small amount of magnesium oxide, ferric oxide make it have good anti-aging and wear resistance; But its high-temperature stability contribution to pitch is less, and use can not give pitch obvious intensity separately, causes pitch to be easy to soften, trickle under hot conditions.The order number of rubber powder is larger, and rubber powder is thinner, and processing charges is higher.Rubber powder among the present invention should be not meticulous, is advisable with the 30--40 order.Because in the properties-correcting agent preparation process, processing temperature is higher, rubber powder is meticulous, and it is serious to degrade in the high temperature process, has affected the character of rubber itself.
Softening agent mainly is phthalate, and its effect is softening rubber powder.Plasticizer consumption can not play the effect of softening rubber powder very little the time, and the certain limit internal plasticizer is more, and rubber powder is more soft, easier processing; Too many cost is too high, and the sexual valence ratio does not have application and popularization value.
Polyethylene is low density polyethylene.Poly effect is the degree of crystallinity that increases properties-correcting agent, makes blend be easy to granulation.Polyethylene also often is used to asphalt modification, but the consistency of itself and pitch is relatively poor, and larger to the low-temperature performance damage of pitch.Therefore poly consumption is too much unsuitable, too much will make the flexible variation of properties-correcting agent; But consumption very little, and the properties-correcting agent blend is clamminess during granulation, stores easy conglomeration.
The present invention also provides a kind of preparation method of bituminous grouting rubber grain properties-correcting agent; in dual-screw-stem machine, add first waste tire rubber powder; to 250-270 ℃; add successively again softening agent, petroleum pitch, rock asphalt and carry out melting; add at last the polyethylene extruding pelletization; by the dicing machine pelletizing, can obtain bituminous grouting rubber grain properties-correcting agent.
The invention has the beneficial effects as follows:
(1) properties-correcting agent is that over-all properties is better than other single polymers properties-correcting agent with micromolecular petroleum pitch, petroleum and rock asphalt filled high polymer rubber, has good consistency with road bitumen.
(2) bituminous grouting rubber grain properties-correcting agent is in conjunction with the ramollescence of softening agent and the high filling effect of hard pitch, make blend and pitch have good consistency, stirring 5-20min under 170--180 ℃ of condition just can fully mix with pitch, need not shearing device, can realize the simple and fast production of rubber asphalt.
(3) in conjunction with the advantage performance of hard pitch and rubber, modifying asphalt take it as Additive Production has good high-temperature behavior and low-temperature performance, SHRP performance classification (PG classification) can reach PG88-28, is much better than SBS modifying asphalt and rubber modified asphalt.
(4) other modified-high polymer agent of comparing, the fluffy adhesion of this product, easy to use, package storage and transportation.
Bituminous grouting rubber grain properties-correcting agent provided by the invention directly adds matrix pitch and prepares high performance modified bitumen, both has been fit to batch production production, also is fit to on-the-spot modification.Properties-correcting agent and bitumen compatibility are good, can stir 5-20min and namely dissolve in pitch under 170-180 ℃ of condition, and pitch PG classification can reach PG88-28, and high temperature performance is good, and on-the-spot modified device is simple, easy handling.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1:
1, bituminous grouting rubber grain properties-correcting agent preparation flow is to add first 50 parts of waste tire rubber powders in dual-screw-stem machine; to 250 ℃; carry out melting adding successively 2 parts of softening agent, 20 parts of petroleum pitch, 13 parts of rock asphalt; add at last 3 parts of polyethylene extruding pelletizations; by the dicing machine pelletizing, can obtain bituminous grouting rubber grain properties-correcting agent.
2, prepare the bituminous grouting rubber modified asphalt with above-mentioned properties-correcting agent, its weight part consists of 25 parts of properties-correcting agent, 0.5 part of stablizer, 75 parts 70# petroleum pitch.The routine techniques index of pitch sees Table 1, PG classification and sees Table 2.
Table 1 bituminous grouting rubber modified asphalt routine techniques index
Table 2 bituminous grouting rubber modified asphalt PG classification
By as seen from Table 1, the ductility of this bituminous grouting rubber modified asphalt is much larger than the rubber asphalt of routine, and softening temperature reaches 63 ℃.And as seen from Table 2, this pitch reaches PG88-28, and high temperature performance all is better than SBS modification or the rubber asphalt (PG76-28) of high-quality, so this properties-correcting agent has better modified effect.
3, abide by China's " standard specification for construction and acceptance of highway asphalt pavement " F40-2004, take the bituminous grouting rubber plastics modified bitumen of above-mentioned preparation as agglutinate, take continuous dense bitumen compound AC-13 as the asphalt type, gradation composition and the asphalt content of the Marshall method of design designing asphalt mixture that code requirement F40-2004 requires, the technological property of asphalt sees Table 3.
Table 3 AC-13 asphalt technical indicator
| Project | Characteristic standard | Test-results | Test method |
| Bitumen aggregate ratio/% | ? | 5.4 | ? |
| Voidage/% | 3～5 | 4.3 | T0706 |
| Void in mineral aggregate/% | Be not less than 13.0 | 16.0 | T0705 |
| Pitch saturation ratio/% | 65～75 | 73 | T0705 |
| The rut dynamic stability (60 ℃, 0.7MPa)/(inferior/min) | Be not less than 2800 | 6047 | T0719-2011 |
| Freeze thawing Ratio of split strength/% | Be not less than 80 | 90 | T0729-2000 |
| The low-temperature bending breaking strain (10 ℃, 5cm/min)/μ ε | Be not less than 2000 | 3600 | T0715-2011 |
As can be seen from Table 3 the rut dynamic stability (60 ℃, 0.7MPa) 6047 times/min, surpass general modified asphalt mixture (general 4000-5000 time/min); Water stability TSR 90% is better than rubber-asphalt mixture; The low-temperature bending breaking strain (10 ℃, 5cm/min) 3600 μ ε (rubber modified mixes 2530 μ ε, SBS rubber composite modified pitch compound 2700 μ ε), so the modified effect of this properties-correcting agent is better than the SBS modified effect.
Embodiment 2:
1, properties-correcting agent preparation: bituminous grouting rubber grain properties-correcting agent preparation flow is to add first 40 parts of waste tire rubber powders in dual-screw-stem machine; to 250 ℃; carry out melting adding successively 2.5 parts of softening agent, 25 parts of petroleum pitch, 10 parts of rock asphalt; add at last 4.5 parts of polyethylene extruding pelletizations; by the dicing machine pelletizing, can obtain bituminous grouting rubber grain properties-correcting agent.
2, prepare the bituminous grouting rubber modified asphalt with above-mentioned properties-correcting agent, its weight part consists of 20 parts of properties-correcting agent, 0.5 part of stablizer, and 80 parts of 70# petroleum pitch, this modifying asphalt PG classification can reach PG82-28.
3, be agglutinate with the above-mentioned modifying asphalt that makes, abide by China's " standard specification for construction and acceptance of highway asphalt pavement " F40-2004, take continuous dense bitumen compound AC-13 as the asphalt type, wherein modifying asphalt is 5.4% of mixture total weight amount.
Embodiment 3:
1, properties-correcting agent preparation: bituminous grouting rubber grain properties-correcting agent preparation flow is to add first 60 parts of waste tire rubber powders in dual-screw-stem machine; to 250 ℃; carry out melting adding successively 5 parts of softening agent, 30 parts of petroleum pitch, 15 parts of rock asphalt; add at last 6 parts of polyethylene extruding pelletizations; by the dicing machine pelletizing, can obtain bituminous grouting rubber grain properties-correcting agent.
2, prepare the bituminous grouting rubber modified asphalt with above-mentioned properties-correcting agent, its weight part consists of 15 parts of properties-correcting agent, 0.5 part of stablizer, and 85 parts of 70# petroleum pitch, this modifying asphalt PG classification can reach PG82-28.
3, be agglutinate with the above-mentioned modifying asphalt that makes, abide by China's " standard specification for construction and acceptance of highway asphalt pavement " F40-2004, take continuous dense bitumen compound AC-13 as the asphalt type, wherein modifying asphalt is 5.4% of mixture total weight amount.
Although above-mentioned the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (10)
1. a bituminous grouting rubber modified asphalt is characterized in that, its component is 15-25 part bituminous grouting rubber grain, 0.3-1.0 part stablizer, 75-85 part matrix pitch, parts by weight; Wherein, the bituminous grouting rubber grain is as properties-correcting agent, and the composition of this properties-correcting agent and parts by weight thereof are: 20-30 part petroleum pitch, 10-15 part rock asphalt, 40-60 part waste tire rubber powder, 2-5 part softening agent, 3-6 part polyethylene.
2. bituminous grouting rubber modified asphalt as claimed in claim 1 is characterized in that, described matrix pitch is 70# or 90# petroleum pitch.
3. bituminous grouting rubber modified asphalt as claimed in claim 1 is characterized in that, described stablizer is vulcanizing agent.
4. bituminous grouting rubber modified asphalt as claimed in claim 1 is characterized in that, described petroleum pitch is the 10# building asphalt.
5. bituminous grouting rubber modified asphalt as claimed in claim 4 is characterized in that, the softening temperature of described petroleum pitch is between 90-110 ℃.
6. bituminous grouting rubber modified asphalt as claimed in claim 1 is characterized in that, the softening temperature of described rock asphalt is at 150--180 ℃.
7. bituminous grouting rubber modified asphalt as claimed in claim 1 is characterized in that, described waste tire rubber powder is the 30--40 order.
8. bituminous grouting rubber modified asphalt as claimed in claim 1 is characterized in that, described softening agent is phthalic ester plasticizer.
9. bituminous grouting rubber modified asphalt as claimed in claim 1 is characterized in that, described polyethylene is low density polyethylene.
10. the preparation method of bituminous grouting rubber modified asphalt as claimed in claim 1, it is characterized in that, concrete preparation flow is as follows: (1) is heated to flow state with matrix pitch at suitable thermal source, take by weighing a certain amount of matrix pitch, under 170-180 ℃ of condition, add properties-correcting agent, adopt electric mixer stir about 5-10min, guarantee that properties-correcting agent melts fully; (2) keep temperature-resistant, stablizer is added in the pitch, stir 20-30min, can obtain the bituminous grouting rubber modified asphalt.
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| CN104448457A (en) * | 2014-12-12 | 2015-03-25 | 上海仁聚新材料科技有限公司 | Rubber-plastic composite asphalt modifier, rubber-plastic composite modified asphalt and preparation method of rubber-plastic composite modified asphalt |
| CN104479376A (en) * | 2014-12-08 | 2015-04-01 | 重庆路面科技有限公司 | Rubber-plastic composite modified asphalt with stable thermal storage and preparation method thereof |
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| CN104479376A (en) * | 2014-12-08 | 2015-04-01 | 重庆路面科技有限公司 | Rubber-plastic composite modified asphalt with stable thermal storage and preparation method thereof |
| CN104479376B (en) * | 2014-12-08 | 2017-04-12 | 重庆路面科技有限公司 | Rubber-plastic composite modified asphalt with stable thermal storage and preparation method thereof |
| CN104448457A (en) * | 2014-12-12 | 2015-03-25 | 上海仁聚新材料科技有限公司 | Rubber-plastic composite asphalt modifier, rubber-plastic composite modified asphalt and preparation method of rubber-plastic composite modified asphalt |
| CN104448457B (en) * | 2014-12-12 | 2016-06-22 | 上海仁聚新材料科技有限公司 | Rubber and plastic composite asphalt modifier, rubber and plastic compound modified asphalt and preparation method thereof |
| CN107057382A (en) * | 2016-12-31 | 2017-08-18 | 山西省交通科学研究院 | A kind of polymer and montmorillonite modified synergic coal tar pitch and preparation method thereof |
| CN107022199A (en) * | 2017-04-12 | 2017-08-08 | 广西交通科学研究院有限公司 | The preparation method of low glutinous stable rubber and plastic compound modified asphalt and its compound |
| CN110922775A (en) * | 2019-12-12 | 2020-03-27 | 浙江省交通集团检测科技有限公司 | Buton rock asphalt modifier based on environment-friendly rubber powder and preparation method and application thereof |
| CN112374805A (en) * | 2020-11-16 | 2021-02-19 | 中交建冀交高速公路投资发展有限公司 | Carbon fiber rubber modified asphalt mixture and preparation method thereof |
| CN115785685A (en) * | 2022-12-20 | 2023-03-14 | 山东交科路美达新材料科技有限公司 | Natural rock asphalt composite modified asphalt mixture and preparation method thereof |
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Inventor after: Wang Lizhi Inventor after: Wang Peng Inventor after: Ren Ruibo Inventor after: Geng Litao Inventor after: Xu Qiang Inventor after: Gao Xiaoning Inventor after: Yu Pengpeng Inventor before: Wang Lizhi Inventor before: Wang Peng Inventor before: Ren Ruibo Inventor before: Geng Litao Inventor before: Xu Qiang Inventor before: Gao Xiaoning |
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Application publication date: 20131023 |