CN115369713A - High-ductility stress absorption asphalt surface layer material - Google Patents
High-ductility stress absorption asphalt surface layer material Download PDFInfo
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- CN115369713A CN115369713A CN202211018987.0A CN202211018987A CN115369713A CN 115369713 A CN115369713 A CN 115369713A CN 202211018987 A CN202211018987 A CN 202211018987A CN 115369713 A CN115369713 A CN 115369713A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 153
- 239000000463 material Substances 0.000 title claims abstract description 50
- 239000002344 surface layer Substances 0.000 title claims abstract description 27
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 152
- 239000003208 petroleum Substances 0.000 claims abstract description 51
- WPYMKLBDIGXBTP-UHFFFAOYSA-N Benzoic acid Natural products OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims abstract description 23
- -1 benzoic acid modified carbon nanotube Chemical class 0.000 claims abstract description 20
- 239000005711 Benzoic acid Substances 0.000 claims abstract description 19
- 235000010233 benzoic acid Nutrition 0.000 claims abstract description 19
- 239000000945 filler Substances 0.000 claims abstract description 10
- 230000033444 hydroxylation Effects 0.000 claims abstract description 10
- 238000005805 hydroxylation reaction Methods 0.000 claims abstract description 10
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 9
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 8
- 239000004584 polyacrylic acid Substances 0.000 claims abstract description 8
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Natural products NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000004471 Glycine Substances 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims description 98
- 239000003607 modifier Substances 0.000 claims description 52
- 239000002131 composite material Substances 0.000 claims description 49
- 238000010008 shearing Methods 0.000 claims description 20
- BJZYYSAMLOBSDY-QMMMGPOBSA-N (2s)-2-butoxybutan-1-ol Chemical compound CCCCO[C@@H](CC)CO BJZYYSAMLOBSDY-QMMMGPOBSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000000839 emulsion Substances 0.000 claims description 11
- 239000011259 mixed solution Substances 0.000 claims description 5
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 3
- 230000001804 emulsifying effect Effects 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 31
- 230000035882 stress Effects 0.000 description 21
- 238000012360 testing method Methods 0.000 description 20
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 18
- 239000002041 carbon nanotube Substances 0.000 description 15
- 229910021393 carbon nanotube Inorganic materials 0.000 description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 11
- 229920005862 polyol Polymers 0.000 description 9
- 150000003077 polyols Chemical class 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- 239000010410 layer Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 4
- 230000032683 aging Effects 0.000 description 4
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 235000019441 ethanol Nutrition 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- FVIGODVHAVLZOO-UHFFFAOYSA-N Dixanthogen Chemical compound CCOC(=S)SSC(=S)OCC FVIGODVHAVLZOO-UHFFFAOYSA-N 0.000 description 2
- PXIPVTKHYLBLMZ-UHFFFAOYSA-N Sodium azide Chemical compound [Na+].[N-]=[N+]=[N-] PXIPVTKHYLBLMZ-UHFFFAOYSA-N 0.000 description 2
- 150000001540 azides Chemical class 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 150000005846 sugar alcohols Polymers 0.000 description 2
- XINQFOMFQFGGCQ-UHFFFAOYSA-L (2-dodecoxy-2-oxoethyl)-[6-[(2-dodecoxy-2-oxoethyl)-dimethylazaniumyl]hexyl]-dimethylazanium;dichloride Chemical compound [Cl-].[Cl-].CCCCCCCCCCCCOC(=O)C[N+](C)(C)CCCCCC[N+](C)(C)CC(=O)OCCCCCCCCCCCC XINQFOMFQFGGCQ-UHFFFAOYSA-L 0.000 description 1
- YIWGJFPJRAEKMK-UHFFFAOYSA-N 1-(2H-benzotriazol-5-yl)-3-methyl-8-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carbonyl]-1,3,8-triazaspiro[4.5]decane-2,4-dione Chemical compound CN1C(=O)N(c2ccc3n[nH]nc3c2)C2(CCN(CC2)C(=O)c2cnc(NCc3cccc(OC(F)(F)F)c3)nc2)C1=O YIWGJFPJRAEKMK-UHFFFAOYSA-N 0.000 description 1
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/26—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/20—Binder incorporated in cold state, e.g. natural asphalt
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Health & Medical Sciences (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Road Paving Structures (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application relates to the technical field of pavement materials, and particularly discloses a high-ductility stress absorption asphalt surface layer material. A high-ductility stress absorption asphalt surface material is composed of the following raw materials in parts by weight: 4.3-5.0 parts of asphalt and 85-95 parts of aggregate; 4.5-5.5 parts of a filler; the asphalt is prepared by modifying petroleum asphalt, TPU and modified carbon nano tubes; the modified carbon nanotube is one or more of a benzoic acid modified carbon nanotube, a silane coupling agent modified carbon nanotube, a glycine modified carbon nanotube, a hydroxylation modified carbon nanotube and a polyacrylic acid modified carbon nanotube. The application can solve the problem that semi-rigid asphalt pavement easily generates reflection cracks.
Description
Technical Field
The application relates to the technical field of pavement materials, in particular to a high-ductility stress absorption asphalt surface layer material.
Background
In order to meet the economic development requirements, high-grade highways are beginning to adopt the structural form of semi-rigid base asphalt pavements. Semi-rigid base asphalt pavement structures typically include a rigid/semi-rigid base layer and an asphalt overlay. In order to solve the problem that the rigid/semi-rigid base layer is easy to crack, seams are generally prefabricated on the surface of the base layer board at certain intervals. Under the action of temperature cycle change and traffic load, the original joint edge of the rigid/semi-rigid base layer is easy to move and deform, so that stress concentration is generated at the upper end asphalt surface layer corresponding to the joint, and reflection cracks are generated on the asphalt surface layer from bottom to top under the action of vehicle load and rainwater infiltration. How to solve the reflection cracks of the semi-rigid asphalt pavement is a problem to be solved urgently in road management and maintenance.
At present, aiming at the problem of reflection cracks of semi-rigid asphalt pavements, the following methods are mainly adopted: the geotechnical cloth, the geotechnical grille, the modified asphalt felt, the steel wire mesh and the like are arranged between the rigid/semi-rigid base layer and the asphalt surface layer to serve as crack relieving layers to prevent the generation of reflection cracks of the asphalt surface layer, and after actual detection, the applicant finds that the semi-rigid asphalt pavement prepared by the method of arranging the geotechnical cloth has the load cycle number of 300-500 generally and cracks are easy to occur in a short period of time based on an OT (overlay tester) test. Therefore, how to increase the number of load cycles so as to prevent the generation of cracks in the semi-rigid base asphalt pavement for a long time is a problem to be solved.
Disclosure of Invention
In order to solve the problem that semi-rigid asphalt pavement is easy to generate reflection cracks, the application provides a high-ductility stress absorption asphalt surface layer material.
In a first aspect, the application provides a high ductility stress absorbing asphalt pavement material, which adopts the following technical scheme: a high-ductility stress absorption asphalt surface layer material is composed of the following raw materials in parts by weight: 4.3-5.0 parts of asphalt and 85-95 parts of aggregate; 4.5-5.5 parts of a filler, wherein the asphalt is prepared by modifying petroleum asphalt, TPU and modified carbon nano tubes;
the modified carbon nanotube is one or more of a benzoic acid modified carbon nanotube, a silane coupling agent modified carbon nanotube, a glycine modified carbon nanotube, a hydroxylation modified carbon nanotube and a polyacrylic acid modified carbon nanotube;
the preparation method of the modified asphalt comprises the following steps:
preparing a modified carbon nano tube/TPU composite modifier: emulsifying the TPU to obtain TPU emulsion; adding the modified carbon nano tube into TPU emulsion to obtain a modified carbon nano tube/TPU mixed solution, wherein the mass ratio of TPU to modified carbon nano tube is (4-8) to (0.2-0.6); extruding and granulating the modified carbon nanotube/TPU mixed solution to obtain a modified carbon nanotube/TPU composite modifier;
preparing modified asphalt: heating petroleum asphalt to a flowing state to obtain flowing petroleum asphalt; shearing the flowing petroleum asphalt and the modified carbon nano tube/TPU composite modifier at 170-185 ℃ for 90-120min at a shearing rate of 2000-3500rpm, wherein the mass ratio of the petroleum asphalt to the modified carbon nano tube/TPU composite modifier is (35-45): 1, so as to obtain the modified asphalt.
By adopting the technical scheme, the TPU comprises a soft section and a hard section, the soft section endows the TPU with good flexibility and ductility, the TPU is added into the petroleum asphalt, unsaturated bonds in the TPU and the petroleum asphalt can generate a crosslinking reaction, so that the intermolecular acting force of the petroleum asphalt is improved, the ductility of the petroleum asphalt is improved by the soft end in the TPU, and when the asphalt surface layer material is subjected to an external force, a part of stress is absorbed through plastic deformation, the stress concentration is dissipated, the probability of generating reflection cracks is reduced, and the capacity of the asphalt surface layer material for resisting the reflection cracks is improved;
when carbon nanotubes are commonly used, the carbon nanotubes and a surfactant are added to the TPU together, and the surfactant reduces the viscosity of the petroleum asphalt and affects the bonding strength between the petroleum asphalt and the aggregate. According to the application, the carbon nano tube is modified to obtain the modified carbon nano tube, and then the modified carbon nano tube is compounded with the TPU, so that the influence of the surfactant on the viscosity of the petroleum asphalt is reduced.
One part of the modified carbon nano tube is inserted into the TPU, and the other part of the modified carbon nano tube is adsorbed on the surface of the TPU, so that the roughness of the surface of the TPU is improved, and the interface strength of the TPU and the petroleum asphalt is enhanced. When the asphalt surface layer material is subjected to external force, the modified carbon nano tube can absorb partial stress in the process of being pulled out from the TPU.
The addition of the TPU and the modified carbon nano tube also improves the roughness of the surface of the modified asphalt, enhances the bonding strength of the modified asphalt and the aggregate, improves the anti-reflection crack capability of the asphalt pavement material under the combined action of the TPU and the modified carbon nano tube, and solves the problem that semi-rigid asphalt pavements are easy to generate reflection cracks.
Preferably, the mass ratio of the TPU to the modified carbon nano tube is (4-8) to (0.3-0.5).
By adopting the technical scheme, when the mass ratio of the TPU to the modified carbon nano tube is (4-8) to (0.3-0.5), the modified carbon nano tube has better dispersity in the TPU emulsion and more modified carbon nano tubes are attached to the TPU.
Preferably, the mass ratio of the petroleum asphalt to the modified carbon nanotube/TPU composite modifier is (37-42): 1.
By adopting the technical scheme, when the mass ratio of the petroleum asphalt to the modified carbon nano tube/TPU composite modifier is (37-42): 1, the modified carbon nano tube/TPU composite modifier is properly crosslinked with the petroleum asphalt, and the modified carbon nano tube/TPU composite modifier is uniformly dispersed in the petroleum asphalt.
Preferably, the modified carbon nanotube is a hydroxylated modified carbon nanotube and/or a benzoic acid modified carbon nanotube.
By adopting the technical scheme, when the hydroxylation modified carbon nano tube is subjected to external force, the plastic deformation capacity is stronger, and the energy consumed for pulling the hydroxylation modified carbon nano tube out of the TPU is larger, so that more stress is absorbed, and the anti-reflection crack capacity of the asphalt pavement material is improved; benzoic acid and the carbon nano tubes are interacted through pi-pi bonds, so that benzoic acid molecules are adsorbed and wrapped on the surfaces of the carbon nano tubes, adsorption agglomeration among the carbon nano tubes is overcome, and the dispersibility of the benzoic acid modified carbon nano tubes in the TPU emulsion is good; under the combined action of the hydroxylation modified carbon nano tube and the benzoic acid modified carbon nano tube, the carbon nano tube with stronger plastic deformation capability can be obtained, and the carbon nano tube can have good dispersibility in TPU emulsion, so that the asphalt surface layer material with stronger stress absorption capability can be obtained.
Preferably, the shear rate is 2500 to 3000rpm.
By adopting the technical scheme, when the shearing rate is 2500-3000rpm, the thinning degree of the modified carbon nano tube/TPU composite modifier is moderate, the dispersion of the modified carbon nano tube/TPU composite modifier is promoted, the generation of stress concentration points in an asphalt surface layer material is reduced, and the modified asphalt is not easy to age.
Preferably, the shearing time is 100-110min.
By adopting the technical scheme, when the shearing time is 100-110min, the modified carbon nanotube/TPU composite modifier is fully contacted with the petroleum asphalt, the modified carbon nanotube/TPU composite modifier has a good modification effect on the petroleum asphalt, the bonding strength between the modified carbon nanotube/TPU composite modifier and the petroleum asphalt is high, and the modified asphalt is not easy to age.
Preferably, the TPU is one or more of PTMG2000 type TPU, PCL2000 type TPU, PEG2000 type TPU and PCDL2000 type TPU.
Preferably, the TPU is a PTMG2000 type TPU.
By adopting the technical scheme, the PTMG2000 type TPU has lower glass transition temperature, and the obtained asphalt surface layer material has higher ductility.
In summary, the present application has the following beneficial effects:
1. the method comprises the steps of modifying petroleum asphalt by adopting TPU and modified carbon nanotubes to obtain modified asphalt; the soft segment of the TPU provides high ductility to the modified petroleum asphalt; the modified carbon nano tube is attached to the surface of the TPU, so that the cohesiveness of the TPU and the petroleum asphalt is enhanced, and the modified carbon nano tube inserted into the TPU can absorb a part of stress when being pulled out by external force; the TPU and the modified carbon nano tube increase the surface roughness of the petroleum asphalt and enhance the bonding strength of the petroleum asphalt and the aggregate; under the combined action of the TPU and the modified carbon nano tube, the capability of the asphalt pavement material for resisting reflection cracks is improved, and the problem that the semi-rigid asphalt pavement is easy to generate reflection cracks is solved.
2. The hydroxylation modified carbon nano tube and/or the benzoic acid modified carbon nano tube are adopted, so that the hydroxylation modified carbon nano tube has stronger plastic deformation capacity; the dispersibility of the benzoic acid modified carbon nano tube in the TPU emulsion is good.
3. The PTMG2000 type TPU is adopted in the application, the glass transition temperature of the PTMG2000 type TPU is lower, the ductility at low temperature is higher, and the ductility of the obtained asphalt surface layer material is higher.
Detailed Description
The present application will be described in further detail with reference to examples.
Unless otherwise specified, the specifications of the raw materials used in the following examples and comparative examples are detailed in table 1.
TABLE 1 raw material Specification information
The detection results of three indexes of penetration, ductility and softening point of SK high-viscosity asphalt are shown in Table 2.
TABLE 2 SK high-viscosity asphalt test results
| Detecting items | Measured value |
| Penetration (25 ℃,100 g, 5 s) 0.1mm | 63 |
| Softening Point (. Degree. C.) | 92.5 |
| Ductility (5 ℃, 5 cm/min) cm | 35 |
The density results and the results of the conventional test indexes of the aggregate are shown in tables 3 and 4.
TABLE 3 Density results for aggregates
TABLE 4 conventional test index results for aggregates
The detection results of various technical indexes of the filler are detailed in table 5.
TABLE 5 detection results of various technical indexes of the filler
The grading design of the mineral aggregate (aggregate plus filler) is detailed in table 6.
TABLE 6 grading design of mineral aggregates
Preparation example
Preparation example of modified carbon nanotube
Preparation example 1
Preparing the benzoic acid modified carbon nano tube: mixing the carbon nano tube with a benzoic acid solution, dispersing for 40 minutes, vacuumizing for 6 hours, washing with absolute ethyl alcohol, centrifuging and drying to obtain the benzoic acid modified carbon nano tube.
Preparation example 2
Preparing the silane coupling agent modified carbon nano tube: adding a silane coupling agent into absolute ethyl alcohol to obtain a silane coupling agent ethanol solution, adding the carbon nano tube into the silane coupling agent ethanol solution, stirring for 2 hours, heating to 70 ℃, stirring and refluxing for 2 hours, filtering, drying and grinding to obtain the silane coupling agent modified carbon nano tube.
Preparation example 3
Preparing glycine modified carbon nano tubes: the difference from preparation example 1 is that: the quality of benzoic acid is changed into glycine.
Preparation example 4
Preparing a hydroxylation modified carbon nanotube: mixing the carbon nano tube with potassium hydroxide, adding ethanol, performing ball milling for 10h, washing with deionized water, and drying at 100 ℃ for 14h to obtain the hydroxylated modified carbon nano tube, wherein the hydroxyl content of the hydroxylated modified carbon nano tube is 5.58wt%.
Preparation example 5
Preparing polyacrylic acid modified carbon nano tubes: dissolving polyacrylic acid chloride in acetone, dropwise adding a sodium azide aqueous solution in an ice water bath to obtain a polyacrylic acid azide solution after dropwise addition, carrying out ultrasonic treatment on the carbon nano tube for 1h, adding the carbon nano tube into the polyacrylic acid azide solution, reacting for 5h, and carrying out suction filtration, washing and drying to obtain the polyacrylic acid modified carbon nano tube.
Preparation example of modified carbon nanotube/TPU composite modifier
Preparation example a
Preparing a modified carbon nano tube/TPU composite modifier: adding polyalcohol (PTMG 2000) and 1, 4-Butanediol (BOD), heating and stirring to 120 deg.C, vacuum-drying until no obvious bubble is formed, adding diphenylmethane diisocyanate (MDI), and aging to obtain PTMG2000 type TPU; adding TPU into ethyl acetate, dissolving for 2h, adding 65 ℃ water and an emulsifier into TPU/ethyl acetate, shearing at a shearing rate of 2000rpm for 30min, and removing ethyl acetate through reduced pressure distillation to obtain TPU emulsion; adding the benzoic acid modified carbon nano tube prepared in the preparation example 1 into TPU emulsion, shearing at a shearing rate of 2500rpm for 70min, demulsifying, centrifugally separating, and distilling under reduced pressure to obtain a modified carbon nano tube/TPU mixed solution, wherein the mass ratio of TPU to modified carbon nano tube is 4.2, and extruding and granulating by means of a double-screw extruder to obtain the modified carbon nano tube/TPU composite modifier.
Preparation examples b to e
Preparing a modified carbon nano tube/TPU composite modifier: the difference from preparation a is that: the mass ratio of the TPU to the modified carbon nanotube is different, and the specific mass ratio is shown in the following table 7:
TABLE 7 mass ratio of TPU to modified carbon nanotubes
Preparation example f
Preparing a modified carbon nano tube/TPU composite modifier: the difference from preparation e is that: the modified carbon nanotubes are selected differently, and the specific types of the modified carbon nanotubes are shown in the following table 8:
TABLE 8 modified carbon nanotube species
| Item | Selection of modified carbon nanotubes |
| Preparation example e | Benzoic acid modified carbon nanotubes (preparation example 1) |
| Preparation example f | Silane coupling agent modified carbon nanotube (preparation example 2) |
| Preparation example g | Glycine modified carbon nanotube (preparation example 3) |
| Preparation example h | Hydroxylated modified carbon nanotube (preparation example 4) |
| Preparation example i | Polyacrylic acid-modified carbon nanotube (preparation example 5) |
Preparation example j
Preparing a modified carbon nano tube/TPU composite modifier: the difference from preparation e is that: the selection of the modified carbon nanotubes is different, the preparation example selects the benzoic acid modified carbon nanotube (preparation example 1) and the hydroxylated modified carbon nanotube (preparation example 4), and the mass ratio of the TPU, the benzoic acid modified carbon nanotube and the hydroxylated modified carbon nanotube is 5.
Preparation example k
Preparing a modified carbon nano tube/TPU composite modifier: the difference from preparation j is that: when the TPU is prepared, different polyols are selected, and the polyol (PTMG 2000) and the like are replaced by the polyol (PCL 2000) in quality to obtain the PCL2000 type TPU.
Preparation example l
Preparing a modified carbon nano tube/TPU composite modifier: the difference from preparation j is that: when the TPU is prepared, different polyols are selected, and the polyol (PTMG 2000) and the like are replaced by the polyol (PEG 2000) in quality to obtain the PEG2000 type TPU.
Preparation example m
Preparing a modified carbon nano tube/TPU composite modifier: the difference from preparation j is that: when the TPU is prepared, different polyols are selected, and the polyol (PTMG 2000) and the like are replaced by the polyol (PCDL 2000) in quality to obtain the PCDL2000 type TPU.
Preparation example of modified asphalt
Preparation example A
Preparing modified asphalt: heating the petroleum asphalt to a flowing state to obtain flowing petroleum asphalt, shearing the flowing petroleum asphalt and the modified carbon nano tube/TPU composite modifier obtained in the preparation example a at 170 ℃ for 120min at a shearing rate of 2000rpm, wherein the mass ratio of the petroleum asphalt to the modified carbon nano tube/TPU composite modifier is 35.
Preparation examples B to M
Preparing modified asphalt: the difference from preparation A is that: the modified carbon nanotube/TPU composite modifier is selected differently, and the specific selection is shown in table 9 below:
TABLE 9 selection of modified carbon nanotube/TPU composite modifier
| Item | Modified carbon nano tube/TPU composite modifier |
| Preparation example A | Preparation example a |
| Preparation example B | Preparation example b |
| Preparation example C | Preparation example c |
| Preparation example D | Preparation example d |
| Preparation example E | Preparation e |
| Preparation example F | Preparation example f |
| Preparation example G | Preparation example g |
| Preparation example H | Preparation example h |
| Preparation example I | Preparation example i |
| Preparation example J | Preparation example j |
| Preparation example K | Preparation example k |
| Preparation example L | Preparation example l |
| Preparation example M | Preparation example m |
Preparation examples N to Q
Preparing modified asphalt: the difference from preparation J is that: the mass ratio of the petroleum asphalt to the modified carbon nanotube/TPU composite modifier is different, and the specific mass ratio is shown in the following table 10:
TABLE 10 quality ratio of petroleum asphalt to modified carbon nanotube/TPU composite modifier
Preparation examples R to S
Preparing modified asphalt: the difference from preparation Q is that: the heating temperatures of the flowing petroleum asphalt and the modified carbon nanotube/TPU composite modifier are different, and the specific heating temperatures are shown in the following table 11:
TABLE 11 heating temperature
Preparation examples T to V
Preparing modified asphalt: the difference from preparation S is that: the shear rates and shear times were varied, and the specific shear rates and shear times are shown in table 12 below:
TABLE 12 shear rate and shear time
| Item | Shear Rate (rpm) | Shear time (min) |
| Preparation example S | 2000 | 120 |
| Preparation example T | 3500 | 90 |
| Preparation example U | 2500 | 110 |
| Preparation example V | 3000 | 100 |
Preparation of comparative example
Preparation comparative example of modified carbon nanotube/TPU composite modifier
Preparation of comparative examples 1 to 2
Preparing a modified carbon nano tube/TPU composite modifier: the difference from preparation a is that: the mass ratio of the TPU to the modified carbon nanotubes was different, and the specific mass ratio is shown in table 13 below:
TABLE 13 mass ratio of TPU to modified carbon nanotubes
| Item | Mass ratio of TPU to modified carbon nanotubes |
| Preparation example a | 4:0.2 |
| Preparation of comparative example 1 | 9:0.1 |
| Preparation of comparative example 2 | 2:0.8 |
Preparation of comparative example 3
Preparing a modified carbon nano tube/TPU composite modifier: the difference from preparation a is that: and replacing the modified carbon nano tube with TPU in the same mass.
Preparation of comparative example 4
Preparing a modified carbon nano tube/TPU composite modifier: the difference from preparation a is that: the selected carbon nano tube is not modified.
Comparative example of preparation of modified asphalt
Preparation of comparative examples A to D
Modified asphalt preparation the modified asphalt is different from the preparation example A in that: the modified carbon nanotube/TPU composite modifier is selected differently, and the specific selection is shown in table 14 below:
TABLE 14 selection of modified carbon nanotube/TPU composite modifier
Preparation of comparative examples E to F
Preparing modified asphalt: the difference from preparation A is that: the mass ratio of the petroleum asphalt to the modified carbon nanotube/TPU composite modifier is different, and the specific mass ratio is shown in the following table 15:
TABLE 15 Mass ratio of Petroleum asphalt to modified carbon nanotube/TPU composite modifier
Preparation of comparative example G
Preparing modified asphalt: the difference from preparation A is that: the preparation steps of the modified asphalt are different, and the specific operation is as follows: adding polyalcohol (PTMG 2000) and 1, 4-Butanediol (BOD), heating and stirring to 120 deg.C, vacuum-stirring until no obvious bubble is formed, adding diphenylmethane diisocyanate (MDI), and aging to obtain PTMG2000 type TPU; adding TPU into ethyl acetate, dissolving for 2h, adding 65 ℃ water and an emulsifier into TPU/ethyl acetate, shearing at a shearing rate of 2000rpm for 30min, and removing ethyl acetate by reduced pressure distillation to obtain TPU emulsion. Shearing at the shearing rate of 2500rpm for 70min, demulsifying, centrifugally separating, distilling under reduced pressure to obtain a TPU solution, and extruding and granulating by a double-screw extruder to obtain the TPU modifier.
Heating petroleum asphalt to a flowing state to obtain flowing petroleum asphalt, shearing the flowing petroleum asphalt, the modified carbon nano tube obtained in preparation example 1 and the TPU modifier at 170 ℃ for 120min at a shearing rate of 2000rpm, wherein the mass ratio of the petroleum asphalt, the modified carbon nano tube and the TPU modifier is 147.
Examples
Example 1
A high-ductility stress absorbing asphalt surface layer material comprises the following formula:
4.3g of modified asphalt; 85g of aggregate; 4.5g of filler.
Preparing an asphalt surface layer material: and stirring the aggregate in a stirring pot for 40s, adding the modified asphalt prepared in the preparation example A, stirring for 60s, finally adding the filler and stirring for 80s to obtain the asphalt surface layer material. Wherein the heating temperature of the aggregate and the filler is 170 ℃, the heating temperature of the modified asphalt is 185 ℃, and the set temperature of the mixing pot is 150 ℃.
Examples 2 to 3
A high ductility stress absorbing asphalt pavement material, which is different from the material of example 1 in that: the asphalt surface layer material has different raw material compositions, and the specific compositions are shown in the following table 16:
TABLE 16 raw material composition of facing material
| Item | Modified asphalt (g) | Aggregate (g) | Filler (g) |
| Example 1 | 4.3 | 85 | 4.5 |
| Example 2 | 5.0 | 95 | 5.5 |
| Example 3 | 4.6 | 90 | 5 |
Examples 4 to 24
A high ductility stress absorbing asphalt pavement material, which is different from example 3 in that: the selection of modified asphalt was varied, and the specific selection of modified asphalt is shown in table 17 below:
TABLE 17 selection of modified bitumens
Comparative example
Comparative examples 1 to 7
A high ductility stress absorbing asphalt pavement material, which is different from example 3 in that: the modified asphalt is selected differently, and the specific selection is shown in the following table 18:
TABLE 18 selection of modified bitumens
Performance test
Detection method
The semi-rigid base asphalt pavement material is subjected to an OT (overlay tester) test at the ambient temperature of 25 ℃ to detect the reflection crack resistance, the thickness of the base layer of the semi-rigid base asphalt pavement material is 35mm, the thickness of the surface layer is 12mm, wherein the surface layer is selected from the asphalt surface layer materials prepared in examples 1-24 and comparative examples 1-7, each test piece is formed by cutting after being formed by SGC rotary compaction, and the test parameters are as follows:
test piece size: 152mm × 76mm × 38mm
Maximum opening displacement: 0.625mm
One cycle time: 10sec
Test stop criteria: the load of the first period is reduced by 93 percent
The number of load cycles is defined as: number of cycles of load applied to the test piece when the test is stopped
In addition to the test under the standard condition, the accelerated aging test in the test room is carried out on the semi-rigid base asphalt pavement material, the asphalt pavement material is aged for a short period of time, then the test piece is molded and cut, and the cut test piece is placed in an oven at 85 ℃ and is continuously heated for 5 days under the condition of forced ventilation. And (5) after the Test piece is cooled, performing an Overlay Test.
The specific test results are shown in table 19 below.
TABLE 19 Performance test of semi-rigid base asphalt pavement materials
As can be seen by combining comparative examples 1-2 and example 3, and table 19, the number of duty cycles 794 of comparative example 1, and the number of duty cycles 687 of comparative example 2 are much less than 1153 of example 3. This may be because: in the comparative example 1, the content of the modified carbon nano tube is too low, the modified carbon nano tube attached to the surface of the TPU is less, and the interface strength of the TPU and the petroleum asphalt is lower; the content of the modified carbon nanotubes in the comparative example 2 is too high, the modified carbon nanotubes are agglomerated, stress concentration points are formed in the asphalt pavement material, and the anti-reflection crack capability of the asphalt pavement material is reduced.
As can be seen by combining comparative example 3 and example 3, and table 19, the number of duty cycles 598 of comparative example 3 is much less than 1153 of example 3. This indicates that: one part of the modified carbon nano tubes are inserted into the TPU, and the other part of the modified carbon nano tubes are adsorbed on the surface of the TPU, so that the roughness of the surface of the TPU is improved, and the strength of an interface between the TPU and the petroleum asphalt is enhanced. When external force is applied, the modified carbon nano tube can absorb partial stress in the process of being pulled out from the TPU. The modified carbon nano tube and the TPU act together, so that the anti-reflection crack capability of the asphalt pavement material can be obviously improved.
As can be seen by combining comparative example 4 and example 3, and table 19, comparative example 4 has a much smaller number 879 of duty cycles than example 3, probably because: the carbon nano tube has better dispersity after being modified, is not easy to agglomerate and form stress concentration points.
As can be seen by combining comparative examples 5-6 and example 3 and by combining table 19, the number of duty cycles 642 for comparative example 5 and the number of duty cycles 487 for comparative example 6 are much smaller than 1153 for example 3, probably because: in the comparative example 5, the content of the modified carbon nanotube/TPU composite modifier is too high, the modified carbon nanotube/TPU composite modifier is excessively crosslinked with petroleum asphalt, so that the rigidity of an asphalt surface layer is too high, the flexibility is low, and the modified carbon nanotube/TPU composite modifier forms stress concentration points in the asphalt surface layer material, so that the anti-reflection crack capability of the asphalt pavement material is reduced. In the comparative example 6, the content of the modified carbon nanotube/TPU composite modifier is too low, and the modification effect on the petroleum asphalt is not obvious.
It can be seen from the combination of comparative example 7 and example 3 and table 19 that the number of load cycles 901 of comparative example 7 is less than 1153 of example 3, which is probably because example 3 mixes the modified carbon nanotubes with TPU to prepare the modified carbon nanotube/TPU composite modifier, and then adds the modified carbon nanotube/TPU composite modifier into petroleum asphalt to modify the petroleum asphalt, so as to increase the contact probability between the modified carbon nanotubes and TPU, and to make the modified carbon nanotubes adsorbed on the surface of TPU or inserted into TPU as much as possible.
It can be seen from the combination of examples 1-24 and table 19 that the number of load cycles of the asphalt pavement materials of examples 1-24 is still greater than 800 after accelerated aging test, which indicates that the asphalt pavement material of the present application has better durability and can ensure that no crack is generated in the semi-rigid base asphalt pavement in long-term use.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A high-ductility stress absorption asphalt surface layer material is composed of the following raw materials in parts by weight: 4.3-5.0 parts of asphalt and 85-95 parts of aggregate; 4.5-5.5 parts of a filler, wherein the asphalt is prepared by modifying petroleum asphalt, TPU and modified carbon nano tubes;
the modified carbon nanotube is one or more of a benzoic acid modified carbon nanotube, a silane coupling agent modified carbon nanotube, a glycine modified carbon nanotube, a hydroxylation modified carbon nanotube and a polyacrylic acid modified carbon nanotube;
the preparation method of the modified asphalt comprises the following steps:
preparing a modified carbon nano tube/TPU composite modifier: emulsifying the TPU to obtain TPU emulsion; adding the modified carbon nano tube into TPU emulsion to obtain a modified carbon nano tube/TPU mixed solution, wherein the mass ratio of TPU to modified carbon nano tube is (4-8) to (0.2-0.6); extruding and granulating the modified carbon nanotube/TPU mixed solution to obtain a modified carbon nanotube/TPU composite modifier;
preparing modified asphalt: heating petroleum asphalt to a flowing state to obtain flowing petroleum asphalt; shearing the flowing petroleum asphalt and the modified carbon nano tube/TPU composite modifier at 170-185 ℃ for 90-120min at a shearing rate of 2000-3500rpm, wherein the mass ratio of the petroleum asphalt to the modified carbon nano tube/TPU composite modifier is (35-45): 1, so as to obtain the modified asphalt.
2. The high ductility stress absorbing asphalt pavement material according to claim 1, wherein: the mass ratio of the TPU to the modified carbon nano tube is (4-8) to (0.3-0.5).
3. The high ductility stress absorbing asphalt pavement material according to claim 1, wherein: the mass ratio of the petroleum asphalt to the modified carbon nano tube/TPU composite modifier is (37-42) to 1.
4. The high ductility stress absorbing asphalt pavement material according to claim 1, wherein: the modified carbon nano tube is a hydroxylation modified carbon nano tube and/or a benzoic acid modified carbon nano tube.
5. The high ductility stress absorbing asphalt pavement material according to claim 1, characterized in that: the shear rate is 2500-3000rpm.
6. The high ductility stress absorbing asphalt pavement material according to claim 1, wherein: the shearing time is 100-110min.
7. The high ductility stress absorbing asphalt pavement material according to claim 1, wherein: the TPU is one or more of PTMG2000 type TPU, PCL2000 type TPU, PEG2000 type TPU and PCDL2000 type TPU.
8. The high ductility stress absorbing asphalt pavement material according to claim 7, wherein: the TPU is PTMG2000 type TPU.
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| CN104262977A (en) * | 2014-10-23 | 2015-01-07 | 长安大学 | Composite modified asphalt and preparation method thereof |
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| RU2748078C1 (en) * | 2020-04-29 | 2021-05-19 | Федеральное государственное бюджетное образовательное учреждение высшего образования «Тамбовский государственный технический университет» (ФГБОУ ВО «ТГТУ») | Polymer-bitumen composition and method of production thereof |
| CN114686014A (en) * | 2022-05-16 | 2022-07-01 | 秦惠丽 | Modified asphalt with good high-temperature cohesiveness and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104262977A (en) * | 2014-10-23 | 2015-01-07 | 长安大学 | Composite modified asphalt and preparation method thereof |
| CN106380875A (en) * | 2016-08-31 | 2017-02-08 | 山东高速物资储运有限公司 | Aging-resistant high-viscosity high-elasticity modified asphalt and preparation method thereof |
| CN106751741A (en) * | 2016-12-08 | 2017-05-31 | 东南大学 | A kind of preparation method of polyurethane nano composite material |
| RU2748078C1 (en) * | 2020-04-29 | 2021-05-19 | Федеральное государственное бюджетное образовательное учреждение высшего образования «Тамбовский государственный технический университет» (ФГБОУ ВО «ТГТУ») | Polymer-bitumen composition and method of production thereof |
| CN114686014A (en) * | 2022-05-16 | 2022-07-01 | 秦惠丽 | Modified asphalt with good high-temperature cohesiveness and preparation method thereof |
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