CN1266222C - Modified asphalt and preparation process thereof - Google Patents
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- CN1266222C CN1266222C CN 200410053725 CN200410053725A CN1266222C CN 1266222 C CN1266222 C CN 1266222C CN 200410053725 CN200410053725 CN 200410053725 CN 200410053725 A CN200410053725 A CN 200410053725A CN 1266222 C CN1266222 C CN 1266222C
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Abstract
The present invention discloses modified asphalt. The modified asphalt comprises 70 to 80 parts by weight of asphalt (i), 2 to 7 parts by weight of rubber (ii), 15 to 25 parts by weight of thermoplastics (iii), 1 to 5 parts by weight of fibers (iv), 2 to 5 parts by weight of stabilizers (v) which are selected from polypropylene and (styrene-butadiene-styrene) copolymers or the combination, and 2 to 5 parts by weight of filler materials which are selected from calcium carbonate, talc, red mud, mica, kaolin and black carbon or the combination. Compared with the petroleum asphalt for high grade roadway, the modified asphalt has greatly improved penetration degree, ductility and softening point, especially the softening point. The present invention also discloses a method for preparing the modified asphalt.
Description
Invention field
The present invention relates to a kind of modifying asphalt and preparation method thereof.
Background technology
Domestic and international a large amount of bituminous pavements that use in the road and bridge engineering, that bituminous pavement has is smooth, wear-resisting, not airborne dust, fluid-tight advantage, and vibrations were little and noise is low when vehicle travelled on bituminous pavement.But the bituminous wax content is higher, and the road surface of causing asphalt paving is easily softening when high temperature, produce pile-up, permeable, form phenomenons such as reflection crack, surface deformation, a large amount of maintenance of surface expenses is had to drop in the havoc road surface therefore.
Proposed multiple in the prior art to the pitch method of modification in addition.Chinese patent application 02113887.7 (publication number is CN1396235A) relates to a kind of preparation method of modified pavement asphalt of heatproof, the characteristics of this method are that synthetic resin moulding compound that the rubber powder made with the Tire ﹠ Tube of junked tire and waste or used plastics are made adds Stockholm tar and other auxiliary agent at high temperature prepares the degraded macromolecular modifier, this properties-correcting agent of 5-20% is mixed with the 80-95% matrix pitch, make modified pavement asphalt.According to the document, the penetration degree of prepared modified pavement asphalt is 83, and ductility is greater than 100, and softening temperature is 60-65.
Chinese patent application 99112656.4 (publication number is CN1229105A) relates to a kind of plastic waste, waste rubber composite modified asphalt, and this formula for a product is shoddy 6-9%, coal tar 3-5%, activator 0.1-0.15%, polyethylene 4-6%, polypropylene 0.3-0.85%, pitch 80-87%.The preparation technology of this modifying asphalt comprises plastic waste is carried out artificial screening, adds shoddy, coal tar and activator, polyethylene and polypropylene in pitch successively.Do not provide the performance of this modifying asphalt in the document.
In addition, Chinese patent application 90104833.X (publication number is CN1058412A) has disclosed a kind of modifying asphalt that machinery is extruded the clad metal pipeline that is used for, and its main component is byerlyte, Atactic Polypropelene, short glass fiber, regenerated rubber, talcum powder and linking agent etc.Make miscible crosslinked this modifying asphalt that obtains of above-mentioned substance by physics, chemical process.Do not provide the performance of this modifying asphalt in the document.
The softening temperature of modifying asphalt of the prior art still remains to be improved, to satisfy the needs of pavement asphalt better.In addition, the kind of macromolecular material that can be used to pitch is carried out modification is still very limited, and this makes that especially the utilization of spent high molecular material is limited to, and for example will carry out artificial screening to plastic waste among the CN1229105A.Also have, hope can add fills out the more thermoplastics of volume, helps plastic waste recycle and the further cost that reduces modifying asphalt like this.
Summary of the invention
An object of the present invention is to provide a kind of modifying asphalt of excellent property, the interpolation material that wherein is used for modification can be selected from multiple macromolecular material.
Another object of the present invention provides a kind of modified asphalt preparation method.
The invention provides a kind of modifying asphalt, it comprises: (i) 70-84 weight part pitch; (ii) 2-7 parts by weight of rubber; (iii) 15-25 parts by weight of thermoplastic; (iv) 1-5 weight part fiber; (v) the 2-5 weight part is selected from the stablizer of polypropylene, (styrene-butadiene-styrene) multipolymer or its combination; (vi) the 2-5 weight part is selected from the filler powder of lime carbonate, talcum, red mud, mica, kaolin, carbon black or its combination.
In above-mentioned modifying asphalt, preferably described rubber is selected from natural rubber, styrene-butadiene rubber(SBR), chloroprene rubber, ethylene-propylene rubber(EPR) or its combination; Described thermoplastics is selected from polyolefine, polyvinyl chloride, polystyrene or its combination except that polypropylene; Described fiber is selected from polyvinyl, nylon, terylene and artificial silk or its combination.
Preferably, pitch is petroleum pitch.Thermoplastics (iii) is the thermoplastics through the part degraded, and rubber (ii) is the rubber through the part degraded.(vi) the median size of filler powder is in the scope of 1-100nm for component.
Better a kind of modifying asphalt be comprise 75-80 parts by weight of component (i), 2-5 parts by weight of component (ii), the 15-20 parts by weight of component (iii), the 2-5 parts by weight of component (iv), the 2-4 parts by weight of component (v) with the 3-5 parts by weight of component (vi).
The present invention also provides a kind of method for preparing modifying asphalt, and this method may further comprise the steps: (1) adds pitch in the 200-230 ℃ of stablizer that will be selected from polypropylene, (styrene-butadiene-styrene) multipolymer or its combination; (2) in 200-220 ℃ of filler powder that adds fiber, rubber and be selected from lime carbonate, talcum, red mud, mica, kaolin, carbon black or its combination; (3) reduce temperature gradually, add thermoplastics in temperature-fall period, the plasticization temperature that the system temperature when reinforced compares the thermoplastics that is added exceeds about 20 ℃, reduces to 110-130 ℃ until temperature, the modifying asphalt that finally is uniformly mixed.
In the method for the invention, preferably in the process that adds fiber, rubber, filler powder and thermoplastics, every adding is just stirred during in the material of final modifying asphalt 5 weight % fully.
In the method for the invention, fiber better is selected from polyvinyl, nylon, terylene and artificial silk or its combination, rubber better is selected from natural rubber, styrene-butadiene rubber(SBR), chloroprene rubber, ethylene-propylene rubber(EPR) or its combination, and thermoplastics better is selected from polyolefine, polyvinyl chloride, polystyrene or its combination except that polypropylene.The consumption of each component is preferably as follows: 70-84 weight part pitch; The 2-7 parts by weight of rubber; The 15-25 parts by weight of thermoplastic; 1-5 weight part fiber; 2-5 weight part stablizer and 2-5 weight part filler powder.
Modifying asphalt of the present invention has good performance, and the penetration degree that records according to GB/T 4509 (25 ℃, 100g, 5s) be 10-50 (unit is 0.1mm), the ductility that records according to GB/T 4508 (15 ℃, 5cm/min) be 100-180cm, the softening temperature that records according to ring and ball method is 100-130 ℃.By comparison, the quality index of the asphalt for high-grade highway of GB/T15180-94 regulation is that penetration degree is 40-140, and ductility is to be not less than 100cm, and softening temperature is 38-55 ℃.This shows that all more present high grade pavement petroleum pitch of above-mentioned three indexs of modifying asphalt of the present invention has had bigger improvement, and the raising of softening temperature is particularly outstanding.In addition, the characteristics that modifying asphalt of the present invention utilizes macromolecular material to be difficult to degrade have obtained very long aging time, test with the anti-aging test of artificial ultraviolet, and aging time can reach more than 2500 hours and (be equivalent to more than 25 years).
Embodiment
Used pitch can be rock asphalt in the modifying asphalt of the present invention, also can be petroleum pitch.Petroleum pitch preferably, it comprises straight run petroleum pitch and byerlyte.The preferred byerlyte that is to use.Pitch can be by its softening temperature, penetration degree and the calibration of ductility isotactic number, and it is pitch more than 70 that the present invention preferably uses label, such as but not limited to 90#, 100#, 110#, 130# and 140# etc.The bituminous consumption is the 70-84 weight part, preferably the 75-80 weight part.
Rubber in the modifying asphalt of the present invention can be selected from natural rubber, styrene-butadiene rubber(SBR), chloroprene rubber, ethylene-propylene rubber(EPR) or its combination.The consumption of rubber is the 2-7 weight part, preferably the 2-5 weight part.Especially preferably, rubber is the powder of granularity in 100-200 order scope, and this can obtain by the subcooling Ginding process.
Thermoplastics in the modifying asphalt of the present invention can be selected from polyolefine, polyvinyl chloride, polystyrene or its combination except that polypropylene.Polyolefine is polyethylene preferably, and polyethylene can be high density polyethylene(HDPE) (HDPE), new LDPE (film grade) (LDPE), LLDPE (LLDPE).The consumption of thermoplastics is the 15-25 weight part, is preferably the 15-20 weight part.
Fiber in the modifying asphalt of the present invention can be selected from polyvinyl, nylon, terylene and artificial silk or its combination.Nylon includes but not limited to nylon-6, nylon-7, nylon-9, nylon-11, nylon-66, nylon-610, nylon-6 12, nylon-1010 etc., preferably nylon-6 and nylon-66.Artificial silk can be viscose rayon, cuprammonium rayon and acetate rayon.The consumption of fiber is the 1-5 weight part, preferably the 2-5 weight part.
Rubber in the modifying asphalt of the present invention, thermoplastics and fiber preferably can adopt waste and old above-mentioned macromolecular material.Because degraded has more or less taken place partly in the effects such as heat, mechanical force, ultrasonic wave, light, oxygen, water, pharmaceutical chemicals, microorganism that are subjected to, and the segment, low-molecular material and the monomer that are produced by degrading can be strengthened the link effect between each component to waste and old macromolecular material in modifying asphalt in its use.In addition, use spent high molecular material also to effectively utilize waste material and reduce the cost of modifying asphalt, thereby saved resource.Macromolecular material can be pulverized by ordinary method, and it is the 100-200 order that rubber generally is crushed to granularity, and thermoplastics and fiber generally are crushed to granularity and reach more than 50 orders.
In the modifying asphalt of the present invention, also used the stablizer that is selected from polypropylene, (styrene-butadiene-styrene) multipolymer or its combination, it can play the effect of thermally-stabilised and stable chain bond structure.Stablizer is Atactic Polypropelene, (styrene-butadiene-styrene) multipolymer or its combination preferably.The consumption of stablizer is the 2-5 weight part, preferably the 2-4 weight part.
In the modifying asphalt of the present invention, also used the filler powder that is selected from lime carbonate, talcum, red mud, mica, kaolin, carbon black or its combination.These fillers can be used to improve mechanical property (as tensile strength, Young's modulus etc.) on the one hand, also can strengthen the link effect between each component on the other hand, have improved the amount of filling out that adds of thermoplastics.In general, compare with the modifying asphalt that does not contain described filler powder, the present invention contains in the modifying asphalt of filler powder, the adding the amount of filling out and can improve about 5 weight % of thermoplastics.Preferred filler is mica and kaolin.The consumption of filler powder is the 2-5 weight part, preferably the 3-5 weight part.Filler powder preferably particle diameter in the 1-100nm scope.
Modified asphalt preparation method of the present invention has two characteristics: the one, and preparation process is laddering echelon modification, the 2nd, reinforced process is reinforced for the temperature drop formula.Laddering echelon modification is meant pitch by the substep modification, promptly earlier uses the stablizer modification, uses fiber, rubber and filler modified then, last reusable heat thermoplastic plastic modification.The temperature drop formula is reinforced to be meant that controlled temperature progressively descends it in preparation method of the present invention, adds material modifiedly in the process that temperature descends stage by stage, and this temperature lifting type feed way with routine is opposite.Especially the reinforced process of thermoplastics, thermoplastics can be one or more, temperature (200-220 ℃) when controlled temperature is from adding fiber and rubber in this process reduces gradually, finally reduce to 110-130 ℃, in the temperature-fall period, when reaching the temperature of 20 ℃ of plasticization temperatures that exceed certain thermoplastics, add this kind thermoplastics, stir and it is melted fully and mix, so sequentially add all thermoplasticss.For example, if thermoplastic material comprises polyvinyl chloride (plasticization temperature is 150-170 ℃), polystyrene (plasticization temperature is 145-150 ℃), high density polyethylene(HDPE) (plasticization temperature is 140-145 ℃), LLDPE (plasticization temperature is 125-130 ℃) and new LDPE (film grade) (plasticization temperature is 110-115 ℃), so in the process of progressively cooling, should in the time of 170-190 ℃, add polyvinyl chloride successively, in the time of 165-170 ℃, add polystyrene, in the time of 160-165 ℃, add high density polyethylene(HDPE), in the time of 145-150 ℃, add LLDPE, in the time of 130-145 ℃, add new LDPE (film grade).In the method, the chain link activity of the material that fusing point is low is improved, and speed of response is accelerated, easier formation chain bond structure.
In process for preparing modified asphalt of the present invention, stablizer adds abundant stirring the in back mixes itself and pitch, and the speed of stirring and time are that those skilled in the art determine easily.For example, stir speed (S.S.) can be 150-200 rev/min, and churning time can be 1-6 hour, is more preferably 2-3 hour.In addition, in the reinforced process of fiber, rubber, filler and thermoplastics, preferably every adding is just stirred during in the material of final modifying asphalt 5 weight % fully, and purpose is to make the material uniform mixing.Speed that stirs and time are that those skilled in the art according to circumstances determine easily, for example can stir 1-2 hour under 150-200 rev/min of stir speed (S.S.).
In the method for the invention, when the particle diameter of filler powder is very little, in the time of for example in the 1-100nm scope, preferably filler powder is dispersed in and adds pitch in the The suitable solvent again, this solvent should be compatible with pitch and can not be had a negative impact to the present invention.Solvent is diesel oil preferably.
Modifying asphalt of the present invention can be used for industrial circles such as coating, plastics, rubber, also can be used for surfacing, also can be used for the production of waterproof roll.Because modifying asphalt of the present invention has excellent softening temperature performance, so be specially adapted to surfacing.But the purposes of modifying asphalt of the present invention never is limited to surfacing, for example can be used to make bitumen plastics, as acid-proof pipe, flooring material, tar felt, pitched paper etc.In addition, modifying asphalt of the present invention also can be used as the anticorrosion etc. of protective system, particularly oil pipeline.
Further specify the present invention by the following examples, these embodiment never provide constraints to the present invention.
Embodiment 1
In 220 ℃ of adding 2 weight parts (styrene-butadiene-styrene) multipolymers (SBS) in 75 weight part 100# bituminous stirred pots are housed, stirred 1 hour at the rotating speed of 220 ℃ temperature with 200 rev/mins, it is mixed.Add 3 weight part acetate rayons, waste and old styrene-butadiene rubber(SBR) powder (200 order) and the 3 weight part mica powder (mean particle size is 50nm) of 2 weight parts in 210 ℃ then, these powders add in two batches, every batch is no more than 5 weight parts, all stirs 1 hour with 200 rev/mins rotating speed.Then, progressively reduce temperature, add 15 weight part polyvinyl chloride when temperature is reduced to 170-190 ℃, add in three batches, every batch is 5 weight parts, all with 200 rev/mins rotating speed stirring 1 hour.After the uniform mixing, temperature is reduced to 130 ℃, obtains modifying asphalt.
Measure the performance of gained modifying asphalt.According to GB/T 4509 metering needle in-degrees (25 ℃, 100g 5s), is 35 (unit is 0.1mm); According to GB/T 4508 measure ductilities (15 ℃, 5cm/min), be 160cm, the softening temperature that records according to ring and ball method is 108 ℃.
Embodiment 2
In 230 ℃ of adding 3 weight part SBS and 2 weight part Atactic Polypropelenes in 70 weight part 100# bituminous stirred pots are housed, stirred 2 hours at the rotating speed of 230 ℃ temperature with 150 rev/mins, it is mixed.Add 2 weight part nylon, 6,3 weight part polyvinyls, 5 weight part ethylene-propylene rubber(EPR) powder (100 order) and 2 weight part kaolin powder (median size is 80nm) in 220 ℃ then, these materials add in three batches, every batch is no more than 5 weight parts, all stirs 2 hours with 150 rev/mins rotating speed.Then, progressively reduce temperature, add 8 weight part waste and old polystyrols when temperature is reduced to 165-170 ℃, (every batch is no more than 5 weight parts) adds in two batches, all with 150 rev/mins rotating speed stirring 1.5 hours.Further reduce temperature again, add the waste and old LLDPE of 10 weight parts (LLDPE) when temperature is reduced to 145-150 ℃, LLDPE adds in two batches, and every batch 5 weight part all stirred 2 hours with 150 rev/mins rotating speed.After the uniform mixing, temperature is reduced to 130 ℃, obtains modifying asphalt.
Measure the performance of gained modifying asphalt.According to GB/T 4509 metering needle in-degrees (25 ℃, 100g 5s), is 20 (unit is 0.1mm); According to GB/T 4508 measure ductilities (15 ℃, 5cm/min), be 180cm, the softening temperature that records according to ring and ball method is 125 ℃.
Embodiment 3
In 200 ℃ of adding 4 weight part Atactic Polypropelenes in 80 weight part 100# bituminous stirred pots are housed, stirred 100 minutes at the rotating speed of 200 ℃ temperature with 180 rev/mins, it is mixed.Add 2 weight part terylene, waste and old chloroprene rubber powder (160 order), 2 weight part carbon blacks (the about 20nm of median size) and the 3 weight part lime carbonate (the about 10nm of median size) of 3 weight parts in 200 ℃ then, these materials add in two batches, every batch is 5 weight parts, all stirs 100 minutes with 180 rev/mins rotating speed.Then, progressively reduce temperature, add the waste and old polystyrene of 10 weight parts when temperature is reduced to 165-170 ℃, add in two batches, every batch is 5 weight parts, all with 180 rev/mins rotating speed stirring 100 minutes.Further reduce temperature again, when temperature is reduced to 160-165 ℃, add the waste and old high density polyethylene(HDPE) of 5 weight parts (HDPE) and stirred 100 minutes with 180 rev/mins rotating speed.Then, further reducing temperature, when temperature is reduced to 130-145 ℃, adding the waste and old new LDPE (film grade) of 5 weight parts (LDPE) and stirred 100 minutes with 180 rev/mins rotating speed.After the uniform mixing, temperature is reduced to 110 ℃, obtains modifying asphalt.
Measure the performance of gained modifying asphalt.According to GB/T 4509 metering needle in-degrees (25 ℃, 100g 5s), is 40 (unit is 0.1mm); According to GB/T 4508 measure ductilities (15 ℃, 5cm/min), be 130cm, the softening temperature that records according to ring and ball method is 117 ℃.
Embodiment 4
In 210 ℃ of adding 1 weight part Atactic Polypropelene and 2 weight part SBS in 84 weight part 100# bituminous stirred pots are housed, stirred 3 hours at the rotating speed of 210 ℃ temperature with 160 rev/mins, it is mixed.Add 1 weight part nylon, 66,3 weight part natural rubber powder (200 order), 4 weight part styrene-butadiene rubber(SBR) powder (200 order), 2 weight part red muds (median size is 100nm) and 2 weight part talcums (median size is 100nm) in 210 ℃ then, add in two batches altogether, every batch is 6 weight parts, all stirs 100 minutes at 210 ℃ the temperature rotating speed with 160 rev/mins.Then, progressively reduce temperature, add the waste and old polyvinyl chloride of 10 weight parts when temperature is reduced to 170-190 ℃, add in two batches, every batch is no more than 6 weight parts, all with 160 rev/mins rotating speed stirring 100 minutes.Further reduce temperature again, add the waste and old new LDPE (film grade) of 15 weight parts (LDPE) when temperature is reduced to 130-145 ℃, add in three batches altogether, every batch is no more than 6 weight parts, all with 160 rev/mins rotating speed stirring 100 minutes.After the uniform mixing, temperature is reduced to 120 ℃, obtains modifying asphalt.
Measure the performance of gained modifying asphalt.According to GB/T 4509 metering needle in-degrees (25 ℃, 100g 5s), is 10 (unit is 0.1mm); According to GB/T 4508 measure ductilities (15 ℃, 5cm/min), be 110cm, the softening temperature that records according to ring and ball method is 130 ℃.
Claims (11)
1. modifying asphalt, it comprises:
(i) 70-84 weight part pitch;
(ii) 2-7 parts by weight of rubber, described rubber is selected from natural rubber, styrene-butadiene rubber(SBR), chloroprene rubber, ethylene-propylene rubber(EPR) or its combination;
(iii) 15-25 parts by weight of thermoplastic, described thermoplastics is selected from polyolefine, polyvinyl chloride, polystyrene or its combination except that polypropylene;
(iv) 1-5 weight part fiber;
(v) the 2-5 weight part is selected from the stablizer of polypropylene, (styrene-butadiene-styrene) multipolymer or its combination;
(vi) the 2-5 weight part is selected from the filler powder of lime carbonate, talcum, red mud, mica, kaolin, carbon black or its combination.
2. modifying asphalt as claimed in claim 1 is characterized in that described rubber is selected from natural rubber, chloroprene rubber, ethylene-propylene rubber(EPR) or its combination; Described thermoplastics is selected from polyethylene, polyvinyl chloride, polystyrene or its combination; Described fiber is selected from polyvinyl, nylon, terylene and artificial silk or its combination.
3. modifying asphalt as claimed in claim 1 is characterized in that described pitch is petroleum pitch.
4. modifying asphalt as claimed in claim 1 is characterized in that described thermoplastics (iii) is the thermoplastics through the part degraded, and described rubber (ii) is the rubber through the part degraded.
5. modifying asphalt as claimed in claim 1, (vi) the median size of filler powder is in the scope of 1-100nm to it is characterized in that described component.
6. modifying asphalt as claimed in claim 1 or 2, it is characterized in that it comprise 75-80 parts by weight of component (i), 2-5 parts by weight of component (ii), the 15-20 parts by weight of component (iii), the 2-5 parts by weight of component (iv), the 2-4 parts by weight of component (v) with the 3-5 parts by weight of component (vi).
7. modifying asphalt as claimed in claim 1 is characterized in that, it by component (i), component (ii), component (iii), component (iv), component (v) and component (vi) constitute.
8. a modified asphalt preparation method as claimed in claim 1 is characterized in that, this method may further comprise the steps:
(1) adds pitch in the 200-230 ℃ of stablizer that will be selected from polypropylene, (styrene-butadiene-styrene) multipolymer or its combination;
(2) in 200-220 ℃ of filler powder that adds fiber, rubber and be selected from lime carbonate, talcum, red mud, mica, kaolin, carbon black or its combination;
(3) reduce temperature gradually, add thermoplastics in temperature-fall period, the plasticization temperature that the system temperature when reinforced compares the thermoplastics that is added exceeds 20 ℃, reduces to 110-130 ℃ until temperature, the modifying asphalt that finally is uniformly mixed,
Wherein said rubber is selected from natural rubber, styrene-butadiene rubber(SBR), chloroprene rubber, ethylene-propylene rubber(EPR) or its combination; And described thermoplastics is selected from polyolefine, polyvinyl chloride, polystyrene or its combination except that polypropylene.
9. method as claimed in claim 8 is characterized in that in the process that adds fiber, rubber, filler powder and thermoplastics, and every adding is just stirred during in the material of final modifying asphalt 5 weight % fully.
10. method as claimed in claim 9, it is characterized in that described fiber is selected from polyvinyl, nylon, terylene and artificial silk or its combination, described rubber is selected from natural rubber, styrene-butadiene rubber(SBR), chloroprene rubber, ethylene-propylene rubber(EPR) or its combination, and described thermoplastics is selected from polyolefine, polyvinyl chloride, polystyrene or its combination except that polypropylene.
11. as each described method among the claim 8-10, it is characterized in that the consumption of each component is as follows: 75-80 weight part pitch; The 2-5 parts by weight of rubber; The 15-20 parts by weight of thermoplastic; 2-5 weight part fiber; 2-4 weight part stablizer and 3-5 weight part filler powder.
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| CN 200410053725 CN1266222C (en) | 2004-08-13 | 2004-08-13 | Modified asphalt and preparation process thereof |
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| CN 200410053725 CN1266222C (en) | 2004-08-13 | 2004-08-13 | Modified asphalt and preparation process thereof |
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| CN1597784A CN1597784A (en) | 2005-03-23 |
| CN1266222C true CN1266222C (en) | 2006-07-26 |
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| CN 200410053725 Expired - Fee Related CN1266222C (en) | 2004-08-13 | 2004-08-13 | Modified asphalt and preparation process thereof |
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| CN113480240B (en) * | 2021-08-06 | 2022-05-03 | 广东水电二局股份有限公司 | Asphalt concrete and preparation method thereof |
| CN115572412B (en) * | 2022-11-09 | 2024-03-22 | 中交第二航务工程局有限公司 | Stabilizer for improving storage stability of polymer modified asphalt |
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