CN104556889A - Anti-rutting asphalt mixture and preparation method thereof - Google Patents
Anti-rutting asphalt mixture and preparation method thereof Download PDFInfo
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- CN104556889A CN104556889A CN201310495667.9A CN201310495667A CN104556889A CN 104556889 A CN104556889 A CN 104556889A CN 201310495667 A CN201310495667 A CN 201310495667A CN 104556889 A CN104556889 A CN 104556889A
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Abstract
The invention discloses an anti-rutting asphalt mixture and a preparation method thereof. The anti-rutting asphalt mixture disclosed by the invention comprises the following components in percentage by weight: 1.0-3.0% of an anti-rutting modifying agent, 4.0-6.0% of petroleum asphalt, 1.0-3.0% of cement, 1.0-3.0% of a mineral powder, and 85.0-93% of aggregates. The preparation method of the anti-rutting asphalt mixture comprises the following steps: heating a stirring kettle and the aggregates to be at a temperature of 125-150 DEG C for standby application, simultaneously adding molten petroleum asphalt, the aggregates, the cement, the mineral powder and anti-rutting modifying agent particles in the stirring kettle, and uniformly stirring the mixture so as to obtain the anti-rutting asphalt mixture. The specially-made anti-rutting modifying agent is added in the anti-rutting asphalt mixture, so that the dynamic rutting stability of a mixture vehicle is greatly improved, the anti-rutting performance of asphalt pavements can be obviously improved, and the anti-rutting asphalt mixture is particularly suitable for asphalt highways with heavy traffics and asphalt highways where rutting is easy to occur in high-temperature regions in the South of China.
Description
Technical field
The present invention relates to a kind of anti-rutting asphalt compound and preparation method thereof.
Background technology
Due to the reason such as the heavy loading day by day increasing and transport of China's vehicle, bituminous pavement generation rut, gather around the phenomenons such as bag and be on the rise, particularly outstanding in south China hot area.This phenomenon has become one of main collapse mode of the current bituminous highway of China, has had a strong impact on bituminous pavement traffic safety, service level and work-ing life.
As far back as 1900, people just started to carry out modifying asphalt with sulphur, improved the anti-rut behavior of asphaltic road-mix surface course, but due to sulphur price surging, and sulphur modified asphalt compound discharges H in process of production
2the problem of the sulfurous gass such as S, constrains the technical development of sulphur modified asphalt.Until phase early 1980s, the sulphur base properties-correcting agent SEAM(sulphur extended asphalt modifier that Luo Kebang get company of the U.S. researchs and produces) solve sulfurous gas emission problem in production process preferably, and it is cheap, easy to use, sulphur modified asphalt technology is made again to obtain comparatively widespread use.China is to the research application relatively evening of SEAM bituminous pavement, until 2000 have just built SEAM Techniques of Experimental Road for Modified Asphalt in Tianjin, also build Experiment Road in Heilungkiang thereafter, and achieved good effect, but it is less to apply scale generally, research also inadequate system, comprehensively.
Sulphur is applied in asphalt, is generally by its granulation, forms particulate state, when storing and use more for convenience.CN1402958A by the sulphur of 13% ~ 30%, 3.0% ~ 13% dispersion agent, all the other are water, be mixed with into sulfur granule, dispersion agent is wherein one or more in bones of the dead glue, natural gum, water glass, milk-protein.CN1639275A is to liquid sulphur heating and melting, in liquid sulfur add 0.25% ~ 5% carbon black and at least about 0.08% pentyl acetate, be prepared into plasticizing sulphur, then in plasticizing sulphur, add the pitch of at least 10% and the mineral fine etc. of 10%, carry out granulation through sieve plate.What CN1303359A introduced is by the sulphur of 93% ~ 98% and the olefin of 2% ~ 7%, be heated to the highest 135 DEG C in carbon dioxide, after abundant hybrid reaction, not to be cooled to room temperature higher than the speed of 16 DEG C/min, crystalline forming, alkene is wherein the cyclic dimer and cyclic trimer that mix with vinylbenzene.Above-mentioned patent produce sulfur granule time, due to needs sulphur heating and melting be liquid state, service temperature is higher, can produce dense irritating smell, is unfavorable for environment and health of human body.
Sulphur-cake, slate sulphur, sulphur etc. containing impurity are dissolved in solvent by CN101970348A, after removing foreign matter, make the solution cooling being dissolved with sulphur, make sulphur crystallization wherein and through sieve tray granulating and forming, solvent evaporation is recycled.Solvent used has anhydrous ammonia, aqueous ammonia, liquid sulfur dioxide, dithiocarbonic anhydride, dimethyl disulfide etc.This patent needs to use a large amount of solvents, and solvent used is all the objectionable impurities with irritating smell.
CN1690126A by the sulphur of 50% ~ 99.99% and 0% ~ 49% carbon black, the smog inhibitor of 0.01% ~ 1%, the softening agent mixing granulation of 0% ~ 3%, smog inhibitor is wherein stannonic acid zinc, softening agent is propyl carbinol.CN1678704A by the sulphur of 60% ~ 98%, 0.2% ~ 15% carbon black, 1% ~ 30% pitch (or cyclic saturated hydrocarbon, ring-type unsaturated hydrocarbons, polycyclic saturated hydrocarbon, many rings unsaturated hydrocarbons, tar etc.), 1% ~ 33% mineral fine (as flying dust, silica material, ceramic clay etc.) fully mix, form the sulphur of the forms such as ingot, tabular, bulk, particulate state, sheet after cooling, can be used in asphalt.Above-mentioned two patents also need sulphur heating and melting for liquid, and service temperature is higher, can produce dense irritating smell, is unfavorable for environment and health of human body.The high-temperature behavior of asphalt can only be improved, the low temperature anti-cracking performance of compound and anti-water damage property need to improve, and the sulfur granule formed is also more crisp, easily broken when transport and handling, due to the friction between particle, also more dust can be produced, not only to environment, and easily make staff suck, health risk.
Summary of the invention
The rut phenomenon occurred for China's bituminous pavement and the deficiencies in the prior art, the invention provides a kind of anti-rutting asphalt compound and preparation method thereof.Anti-rutting asphalt compound of the present invention adopts special tracking-resisting modifier, when with petroleum pitch, gather materials, cement, breeze etc. combine and are prepared into asphalt, obviously can improve asphalt pavement rut resisting performance, take into account low-temperature performance simultaneously.
Anti-rutting asphalt compound of the present invention, comprises following component with the weight percent meter of anti-rutting asphalt compound:
Tracking-resisting modifier 1.0% ~ 3.0%
Petroleum pitch 4.0% ~ 6.0%
Cement 1.0% ~ 3.0%
Breeze 1.0% ~ 3.0%
Gather materials 85.0% ~ 93.0%;
Wherein said tracking-resisting modifier, comprises following component by percentage to the quality:
Sulphur 70% ~ 94%,
Ethylene-vinyl acetate copolymer 2% ~ 10%,
Shoddy 2% ~ 10%,
Gilsonite 1% ~ 5%,
Flyash 1% ~ 5%.
During preparation the present invention's tracking-resisting modifier used, sulphur used is sheet, Powdered or particulate state, can be commercially available sulphur, also can be gas conditioning or refinery processing oil time the by product sulphur that produces, fusing point is 115 ~ 119 DEG C.
During preparation the present invention's tracking-resisting modifier used, the softening temperature of ethylene-vinyl acetate copolymer (EVA) used is 80 ~ 110 DEG C, and in EVA, vinyl acetate content is 40wt% ~ 70wt%.
During preparation the present invention's tracking-resisting modifier used, shoddy used is the waste old powder that the junked tire reclaimed obtains after pulverizing grinding, and granularity is 30 ~ 80 orders.
During preparation the present invention's tracking-resisting modifier used, gilsonite used is one or both in petroleum pitch, rock asphalt, coal-tar pitch, and penetration degree is 5 ~ 30 1/10mm, softening temperature 70 DEG C ~ 110 DEG C.
During preparation the present invention's tracking-resisting modifier used, flyash used is that the incombustible substance of catching is received from flue gas by coal-fired power plant, and in thin grey shape, the particle size range of particle is 0.5 ~ 300 μm.
The preparation method of the tracking-resisting modifier that anti-rutting asphalt compound of the present invention is used is as follows: render in kneader hopper according to the feeding sequence of gilsonite-shoddy-flyash-sulphur-EVA by material, start pumped vacuum systems simultaneously, carry out environmental protection treatment by after the collection and confinement of gases of generation, material stirs and is kneaded into dough in kneader; Then start bottom discharge screw rod and cutting granulating system, carry out extruding, granulation, obtain the tracking-resisting modifier that the present invention is used.
When preparing anti-rutting asphalt compound of the present invention tracking-resisting modifier used, kneader used is bottom discharge screw rod extrusion type kneader, kneader mixing speed 1300 ~ 1500rpm, and churning time is 30 ~ 60 minutes, mediating temperature is 80 ~ 110 DEG C, and extrusion temperature is 100 ~ 120 DEG C.
When preparing anti-rutting asphalt compound of the present invention tracking-resisting modifier used, kneader used adds pumped vacuum systems, can the obnoxious flavour produced in production process as H
2s, SO
2after collection, absorbed by sodium hydroxide alkaline solution and carry out environmental protection treatment, not only reduce atmospheric pollution, and the gas be mingled with in material can be extracted out, make product closely knit, homogeneous, be conducive to storing, transporting and application.
The present invention's petroleum asphalt penetration used is 60 ~ 120 1/10mm.
One or more during what the present invention was used gathers materials can be limestone, basalt, andesite, grouan gather materials, proportioning meet in close-graded AC-10, AC-13, AC-16 or AC-20 any one.
The present invention's cement used is silicate cement, strength grade is 42.5,42.5R, 52.5,52.5R, 62.5 or 62.5R in any one.
The present invention's breeze used is ground by ore to form, and the component proportion that Particle size requirements is less than 0.075mm is greater than 70%.
The preparation method of anti-rutting asphalt compound of the present invention, comprise following content: in advance stirring tank and gathering materials be heated to 125 ~ 150 DEG C for subsequent use, the pitch of molten state, gather materials, cement, breeze and tracking-resisting modifier particle add in stirring tank simultaneously, stir, obtain anti-rutting asphalt compound.
Anti-rutting asphalt compound tool of the present invention has the following advantages:
1, the tracking-resisting modifier of asphalt of the present invention, with the addition of sulphur, EVA, gilsonite and shoddy simultaneously, when mixing compound, under the synergy of each component, can obviously improve asphalt pavement rut resisting performance, take into account low-temperature performance simultaneously; EVA can be bonded together with the component such as sulphur, makes modified grain have certain snappiness, prevents road surface from cold cracking occurring, avoids the generation that fragmentation or dust occur in transport and handling process; Gilsonite add the consistency that improve modified grain and pitch, be conducive to dispersed in properties-correcting agent compound and wrap in surface of aggregate; Flyash used, utilizes its plastification, improves product degree of compactness and hardness, improves anti-rut behavior, is conducive to product stock and transport; In addition, utilize coal ash instead part asphalt stock, make refuse obtain utilization, be conducive to environmental protection, significantly reduce raw materials cost.
2, the tracking-resisting modifier of anti-rutting asphalt compound of the present invention, preparation process takes the order of addition(of ingredients) into gilsonite-shoddy-flyash-sulphur-EVA, not only be conducive to the pre-thawing of gilsonite, be also conducive to improving the consistency between pitch and shoddy, flyash simultaneously.Then add sulphur, after sulphur is uniformly dispersed and is completely happy and harmonious with the pitch first added, shoddy, flyash, then add EVA as tackiness agent, be conducive to mixing of materials even, and be easily kneaded into dough, make product homogeneous, be conducive to application.
3, the preparation process of tracking-resisting modifier, have employed the kneader installing pumped vacuum systems additional, compared with adopting the way of forcing machine in the past, save the precomminution of gilsonite and these two steps of pre-mixing of material, be conducive to the input of material, production process is simplified, improve production efficiency, pumped vacuum systems simultaneously, obnoxious flavour can be extracted out and carry out collecting and environmental protection treatment, not only reducing atmospheric pollution, and by the gas be mingled with in material is extracted out, make shaping after product homogeneous, be conducive to store, transport and application.
4, in anti-rutting asphalt compound of the present invention owing to the addition of special tracking-resisting modifier, compound rut dynamic stability is significantly improved, the technical requirement of modified asphalt mixture can be reached, be conducive to improving the anti-rut behavior of bituminous pavement.Be particularly useful for the easy bituminous highway that rut occurs of heavy traffic flow or south China high temperature area.
Embodiment
Describe technical scheme of the present invention in detail below in conjunction with embodiment, but the invention is not restricted to following examples.Wherein EVA is particulate state, particle diameter 1 ~ 5mm; Shoddy granularity is wherein 30 ~ 80 orders; The softening temperature of gilsonite is wherein 70 ~ 110 DEG C; Flyash particle size range is wherein 0.5 ~ 300 μm.
Embodiment 1
Taking sulphur 70kg, EVA(vinyl acetate content is respectively 68%, and softening temperature is 105 DEG C) 10kg, shoddy 10kg, gilsonite (penetration degree is 6 1/10mm rock asphalts) 5kg, flyash 5kg.Render in kneader hopper according to gilsonite-shoddy-flyash-sulphur-EVA order, stir and make material be kneaded into dough, starting pumped vacuum systems simultaneously, carrying out environmental protection treatment by after the collection and confinement of gases of generation.Then start bottom discharge screw rod and cutting granulating system, carry out extruding, granulation, form the particle of diameter 3mm, length 2mm ~ 3mm, obtain tracking-resisting modifier.Kneader mixing speed 1300rpm, churning time 30 minutes, mediating temperature is 80 DEG C, and extrusion temperature is 120 DEG C.Proportioning raw materials and properties-correcting agent character are in table 1.
In advance special asphalt stirring tank is heated to 125 DEG C of constant temperature; Liaoyang andesite is gathered materials, and to be mixed with grating be that AC-10 gathers materials, and gross weight is 85kg, be heated to 125 DEG C for subsequent use; Take petroleum pitch (East Sea board) 6.0kg that penetration degree is 115, be heated to 125 DEG C for subsequent use; Take cement, breeze, each 3.0kg of tracking-resisting modifier respectively.Still to be mixed, gather materials, asphalt temperature constant after, above-mentioned material is added in stirring tank together, stirs 2 minutes, release compound.Then be prepared into various bitumen mixture specimen, carry out performance of asphalt mixture evaluation experimental.To asphalt modified effect in table 2.
Embodiment 2
(vinyl acetate content is 43% to take sulphur 94kg, EVA respectively, softening temperature is 83 DEG C) 2kg, shoddy 2kg, gilsonite (penetration degree is 28 1/10mm petroleum pitch) 1 kg, flyash 1kg, according to gilsonite-shoddy-flyash-sulphur-EVA order is rendered in kneader hopper, stir and make material be kneaded into dough, start pumped vacuum systems simultaneously, carry out environmental protection treatment by after the collection and confinement of gases of generation.Then start bottom discharge screw rod and cutting granulating system, carry out extruding, granulation, form the particle of diameter 3mm, length 2mm ~ 3mm, obtain tracking-resisting modifier.Kneader mixing speed 1500rpm, churning time 45 minutes, mediating temperature is 110 DEG C, and extrusion temperature is 100 DEG C.Proportioning raw materials and properties-correcting agent character are in table 1.
In advance special asphalt stirring tank is heated to 150 DEG C of constant temperature; It is gathering materials of AC-16 that Tieling basalt aggregate is mixed with grating, and gross weight is 93kg, be heated to 150 DEG C for subsequent use; Take petroleum pitch (East Sea board) 4.0kg that penetration degree is 65, be heated to 150 DEG C for subsequent use; Take cement, breeze, each 1.0kg of tracking-resisting modifier respectively.Still to be mixed, gather materials, asphalt temperature constant after, above-mentioned material is added in stirring tank together, stirs 2 minutes, release compound.Then be prepared into various bitumen mixture specimen, carry out performance of asphalt mixture evaluation experimental.To asphalt modified effect in table 2.
Embodiment 3
Taking sulphur 82kg, EVA(vinyl acetate content is respectively 55%, softening temperature is 96 DEG C) 6kg, shoddy 6kg, gilsonite (penetration degree is 18 1/10mm coal-tar pitch) 3kg, flyash 3kg, according to gilsonite-shoddy-flyash-sulphur-EVA order is rendered in kneader hopper, stir and make material be kneaded into dough, start pumped vacuum systems simultaneously, carry out environmental protection treatment by after the collection and confinement of gases of generation.Then start bottom discharge screw rod and cutting granulating system, carry out extruding, granulation, form the particle of diameter 3mm, length 2mm ~ 3mm, obtain tracking-resisting modifier.Kneader mixing speed 1400rpm, churning time 60 minutes, mediating temperature is 95 DEG C, and extrusion temperature is 110 DEG C.Proportioning raw materials and properties-correcting agent character are in table 1.
In advance special asphalt stirring tank is heated to 135 DEG C of constant temperature; It is that AC-13 gathers materials that Fushun limestone aggregates is mixed with grating, and gross weight is 89kg, be heated to 135 DEG C for subsequent use; Take petroleum pitch (East Sea board) 5.0kg that penetration degree is 95, be heated to 135 DEG C for subsequent use; Take cement, breeze, each 2.0kg of tracking-resisting modifier respectively.Still to be mixed, gather materials, asphalt temperature constant after, above-mentioned material is added in stirring tank together, stirs 2 minutes, release compound.Then be prepared into various bitumen mixture specimen, carry out performance of asphalt mixture evaluation experimental.To asphalt modified effect in table 2.
Comparative example 1
In advance special asphalt stirring tank is heated to 135 DEG C of constant temperature for subsequent use; It is that AC-13 gathers materials that Fushun limestone aggregates is mixed with grating, and gross weight is 91kg, is heated to 135 DEG C of constant temperature for subsequent use; Take petroleum pitch (East Sea board) 5.0kg that penetration degree is 95, be heated to 135 DEG C of constant temperature for subsequent use; Take cement and each 2.0kg of breeze respectively.Still to be mixed, gather materials, asphalt temperature constant after, above-mentioned material is added in stirring tank together, stirs 2 minutes, release compound.Then be prepared into various bitumen mixture specimen, carry out performance of asphalt mixture evaluation experimental.Asphalt Mixture is in table 2.
Comparative example 2
In advance special asphalt stirring tank is heated to 135 DEG C of constant temperature for subsequent use; It is that AC-13 gathers materials that Fushun limestone aggregates is mixed with grating, and gross weight is 89kg, is heated to 135 DEG C of constant temperature for subsequent use; Take petroleum pitch (East Sea board) 5.0kg that penetration degree is 95, be heated to 135 DEG C of constant temperature for subsequent use; Take cement, breeze, each 2.0kg of sulphur respectively.Still to be mixed, gather materials, asphalt temperature constant after, above-mentioned material is added in stirring tank together, stirs 2 minutes, release compound.Then be prepared into various bitumen mixture specimen, carry out performance of asphalt mixture evaluation experimental.Asphalt Mixture is in table 2.
Table 1 asphalt mixed material modifier proportioning and character
Table 2 asphalt proportioning and character.
From table 2, owing to the addition of special tracking-resisting modifier in asphalt of the present invention, compound rut dynamic stability is significantly improved, the technical requirement of modifying asphalt can be reached, and taken into account low-temperature performance, other index also meets demand of technical standard.
Claims (13)
1. an anti-rutting asphalt compound, is characterized in that, with compound weight percent meter, comprising following component:
Tracking-resisting modifier 1.0% ~ 3.0%
Petroleum pitch 4.0% ~ 6.0%
Cement 1.0% ~ 3.0%
Breeze 1.0% ~ 3.0%
Gather materials 85.0% ~ 93.0%;
Wherein said tracking-resisting modifier, comprises following component by percentage to the quality:
Sulphur 70% ~ 94%,
Ethylene-vinyl acetate copolymer 2% ~ 10%,
Shoddy 2% ~ 10%,
Gilsonite 1% ~ 5%,
Flyash 1% ~ 5%.
2. according to anti-rutting asphalt compound according to claim 1, it is characterized in that: properties-correcting agent sulphur used is sheet, Powdered or particulate state.
3. according to anti-rutting asphalt compound according to claim 1, it is characterized in that: the softening temperature of the ethylene-vinyl acetate copolymer that properties-correcting agent is used is 80 ~ 110 DEG C, in multipolymer, vinyl acetate content is 40wt% ~ 70wt%.
4. according to anti-rutting asphalt compound according to claim 1, it is characterized in that: the granularity of the shoddy that properties-correcting agent is used is 30 ~ 80 orders.
5. according to anti-rutting asphalt compound according to claim 1, it is characterized in that: properties-correcting agent gilsonite used is one or more in petroleum pitch, rock asphalt or coal-tar pitch, and penetration degree is 5 ~ 30 1/10mm, softening temperature 70 ~ 110 DEG C.
6. according to anti-rutting asphalt compound according to claim 1, it is characterized in that: properties-correcting agent flyash used is that the incombustible substance of catching is received from flue gas by coal-fired power plant, and the particle size range of particle is 0.5 ~ 300 μm.
7. according to anti-rutting asphalt compound according to claim 1, it is characterized in that: the preparation method of tracking-resisting modifier comprises following content: according to the feeding sequence of gilsonite-shoddy-flyash-sulphur-EVA, material is rendered in kneader hopper, start pumped vacuum systems simultaneously, carry out environmental protection treatment by after the collection and confinement of gases of generation, material stirs and is kneaded into dough in kneader; Then start bottom discharge screw rod and cutting granulating system, carry out extruding, granulation, obtain tracking-resisting modifier.
8. according to anti-rutting asphalt compound according to claim 7, it is characterized in that: kneader used is bottom discharge screw rod extrusion type kneader, kneader mixing speed 1300 ~ 1500rpm, and churning time is 30 ~ 60 minutes, mediating temperature is 80 ~ 110 DEG C, and extrusion temperature is 100 ~ 120 DEG C.
9. according to anti-rutting asphalt compound according to claim 1, it is characterized in that: petroleum asphalt penetration used is 60 ~ 120 1/10mm.
10. according to anti-rutting asphalt compound according to claim 1, it is characterized in that: one or more during used gathering materials is limestone, basalt, andesite or grouan gather materials, proportioning meet in close-graded AC-10, AC-13, AC-16 or AC-20 any one.
11., according to anti-rutting asphalt compound according to claim 1, is characterized in that: cement used is silicate cement, strength grade is 42.5,42.5R, 52.5,52.5R, 62.5 or 62.5R in any one.
12., according to anti-rutting asphalt compound according to claim 1, is characterized in that: breeze used is ground by ore to form, and the component proportion that Particle size requirements is less than 0.075mm is greater than 70%.
The preparation method of the anti-rutting asphalt compound described in the arbitrary claim of 13. claim 1 ~ 14, comprise following content: stirring tank and gathering materials is heated to 125 ~ 150 DEG C for subsequent use, the petroleum pitch of molten state, gather materials, cement, breeze and tracking-resisting modifier particle add in stirring tank simultaneously, stir, obtain anti-rutting asphalt compound.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104963260A (en) * | 2015-06-10 | 2015-10-07 | 山东省交通科学研究院 | Rut preventing device and method for long uphill section of asphalt pavement |
| CN107840600A (en) * | 2017-11-16 | 2018-03-27 | 西咸新区众力沥青有限公司 | A kind of permanent seal cooling gravity flow asphalt and the construction method in the hardening of track traffic |
| CN110343394A (en) * | 2019-06-24 | 2019-10-18 | 中国路桥工程有限责任公司 | Expressway Asphalt mixture |
| CN114988763A (en) * | 2022-06-01 | 2022-09-02 | 山东大学 | Method for improving water stability of asphalt mixture by compounding coal pitch and red mud |
-
2013
- 2013-10-22 CN CN201310495667.9A patent/CN104556889B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104963260A (en) * | 2015-06-10 | 2015-10-07 | 山东省交通科学研究院 | Rut preventing device and method for long uphill section of asphalt pavement |
| CN107840600A (en) * | 2017-11-16 | 2018-03-27 | 西咸新区众力沥青有限公司 | A kind of permanent seal cooling gravity flow asphalt and the construction method in the hardening of track traffic |
| CN107840600B (en) * | 2017-11-16 | 2021-02-12 | 西安众力沥青有限公司 | Durable self-flowing asphalt mixture and construction method in hardening of rail transit pavement |
| CN110343394A (en) * | 2019-06-24 | 2019-10-18 | 中国路桥工程有限责任公司 | Expressway Asphalt mixture |
| CN114988763A (en) * | 2022-06-01 | 2022-09-02 | 山东大学 | Method for improving water stability of asphalt mixture by compounding coal pitch and red mud |
| CN114988763B (en) * | 2022-06-01 | 2022-10-14 | 山东大学 | A method for compounding coal tar and red mud to improve water stability of asphalt mixture |
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| CN104556889B (en) | 2016-07-27 |
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