CN115650637B - Reactive cold repair asphalt mixture and preparation method thereof - Google Patents
Reactive cold repair asphalt mixture and preparation method thereof Download PDFInfo
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- CN115650637B CN115650637B CN202211178877.0A CN202211178877A CN115650637B CN 115650637 B CN115650637 B CN 115650637B CN 202211178877 A CN202211178877 A CN 202211178877A CN 115650637 B CN115650637 B CN 115650637B
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- 239000000203 mixture Substances 0.000 title claims abstract description 97
- 230000008439 repair process Effects 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000003085 diluting agent Substances 0.000 claims abstract description 59
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 46
- 239000011707 mineral Substances 0.000 claims abstract description 46
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 44
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- 235000020661 alpha-linolenic acid Nutrition 0.000 claims description 6
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- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- -1 polypropylene Polymers 0.000 claims description 6
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- 239000005995 Aluminium silicate Substances 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 5
- 235000012211 aluminium silicate Nutrition 0.000 claims description 5
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 5
- 239000006028 limestone Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 229920002748 Basalt fiber Polymers 0.000 claims description 4
- 239000005639 Lauric acid Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 235000021355 Stearic acid Nutrition 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- 229940114079 arachidonic acid Drugs 0.000 claims description 4
- 235000021342 arachidonic acid Nutrition 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 229910021645 metal ion Inorganic materials 0.000 claims description 4
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 4
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- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 claims description 4
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- 239000010438 granite Substances 0.000 claims description 3
- KWLMIXQRALPRBC-UHFFFAOYSA-L hectorite Chemical compound [Li+].[OH-].[OH-].[Na+].[Mg+2].O1[Si]2([O-])O[Si]1([O-])O[Si]([O-])(O1)O[Si]1([O-])O2 KWLMIXQRALPRBC-UHFFFAOYSA-L 0.000 claims description 3
- 229910000271 hectorite Inorganic materials 0.000 claims description 3
- 229920005610 lignin Polymers 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 claims description 2
- 229920000058 polyacrylate Polymers 0.000 claims description 2
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims 2
- 239000000292 calcium oxide Substances 0.000 claims 2
- 239000003469 silicate cement Substances 0.000 claims 2
- 239000011787 zinc oxide Substances 0.000 claims 2
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- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
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- 235000020778 linoleic acid Nutrition 0.000 description 1
- OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 description 1
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Classifications
-
- 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
- Compositions Of Macromolecular Compounds (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a reactive cold repair asphalt mixture and a preparation method thereof, wherein the reactive cold repair asphalt mixture consists of reactive asphalt, a curing agent, mineral aggregate, fibers and an accelerator according to the weight ratio of (5.0-7.5): (0.3-5.6): (94.6-99.7): (0.15-0.35): (0.02-0.15), the reactive asphalt consists of asphalt and reactive diluent, and the reactive diluent consists of unsaturated fatty acid and saturated fatty acid. The reactive cold repair asphalt mixture is in a loose flowing state at normal temperature, and in a water state, the water can excite the activity of a curing agent to trigger the curing reaction with reactive diluted asphalt, so that the viscosity of the asphalt is increased, and the strength of the mixture is improved. The fiber in the reactive cold repair asphalt mixture can improve the cracking resistance of the fiber, and the accelerator can enhance the permeability of water in the mixture, so that the curing reaction is more uniform and efficient.
Description
Technical Field
The invention relates to the technical field of road construction, in particular to a reactive cold repair asphalt mixture and a preparation method thereof.
Background
The road surface pit slot has great influence on traffic, and the impact load generated by jolt and vibration of the vehicle caused by the pit slot is extremely harmful, so that the driving safety is easily influenced, and various traffic accidents are caused. Meanwhile, rainwater is easy to infiltrate into the pit slot, the original road surface can be damaged in an accelerating way, the service life of the road is further shortened, and larger economic loss is caused.
At present, a hot patching method and a cold patching method are mainly adopted for pit repairing. The thermal compensation method can repair road conditions of the original road surface to a large extent. However, the hot-patch method has high requirements on the construction temperature and equipment of the asphalt mixture, and is difficult to construct in winter or rainy season (with water on the pavement). The cold repairing method, i.e. the cold repairing asphalt mixture is adopted for repairing, has the characteristics of simple construction process, no dependence on large construction machinery, high construction efficiency, short open traffic time and no limitation of seasonal conditions in construction period.
The common cold-patch materials are mostly solvent volatile cold-patch materials, wherein the cold-patch liquid consists of matrix asphalt, a diluent, a modifier and the like, and the cold-patch liquid is mixed with mineral materials to form the cold-patch materials. Because of the existence of the diluent, the strength formation depends on volatilization of the diluent and recompression of vehicle load, the initial strength is mainly provided by the embedding and extruding force of the aggregate, and the asphalt cement is low in initial strength due to low binding force because of non-solidification, and is easy to damage after traffic is opened. The traditional cold-patch material also has the problems of poor water stability and durability, and is extremely easy to generate secondary damage after repairing pits. Another type of cold repairing method adopts emulsified asphalt type cold repairing material, however, the demulsification time of the emulsified asphalt is difficult to control accurately, and the stability is poor, so that the emulsified asphalt type cold repairing material has larger problems in the aspects of forming time, storage stability and the like.
Disclosure of Invention
The invention discloses a reactive cold repair asphalt mixture and a preparation method thereof, and aims to solve the problems that the traditional cold repair asphalt mixture provided in the background art is poor in water stability and durability, and secondary damage is very easy to generate after a pit is repaired for a long time. Another type of cold repairing method adopts emulsified asphalt type cold repairing material, however, the demulsification time of the emulsified asphalt is difficult to control accurately, and the stability is poor, so that the emulsified asphalt type cold repairing material has the technical problems of forming time, storage stability and the like.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the reactive cold repair asphalt mixture comprises asphalt and a reactive diluent, wherein the asphalt and the reactive diluent are mixed according to a certain proportion to prepare the reactive diluent asphalt, the proportion of the asphalt to the reactive diluent is 50:50-80:20, the asphalt comprises 70 # road petroleum asphalt, 90 # road petroleum asphalt and corresponding modified asphalt, the reactive diluent is unsaturated fatty acid and saturated fatty acid which are mixed according to a certain proportion, the unsaturated fatty acid comprises one or more of oleic acid, linoleic acid, linolenic acid and arachidonic acid, the saturated fatty acid comprises one or more of palmitic acid, stearic acid, lauric acid and myristic acid, the proportion of the unsaturated fatty acid to the saturated fatty acid in the reactive diluent is 75:25-98:2, the iodine value of the reactive diluent is 120-180, and the Brookfield viscosity of the reactive diluent asphalt at 60 ℃ is 500-2500 mPa.s.
The preparation method of the reactive cold repair asphalt mixture specifically comprises the following steps:
s11: heating the asphalt to 90-120 ℃ and preserving heat for later use;
s12: premixing unsaturated fatty acid and saturated fatty acid according to a proportion to prepare a reactive diluent, and sealing and preserving at normal temperature;
s13: and (3) adding the reactive diluent in the step (S12) into the asphalt treated in the step (S11), and stirring at a speed of 100-500r/min for 30-60 minutes to obtain the reactive asphalt.
In a preferred scheme, the reactive cold repair asphalt mixture further comprises reactive asphalt cutback, curing agent, mineral aggregate, fiber and accelerator according to the weight ratio of (5.0-7.5): (0.6-2.8): (97.2-99.4): (0.2-0.35): (0.02-0.1), and specifically comprises the following steps:
s21: heating each grade of mineral aggregate to above 100deg.C, and standing at 60-100deg.C after it is completely dried;
s22, sequentially adding the dry aggregate, the curing agent and the accelerator which meet the grading requirement according to the proportion, and stirring for 5-30S at the speed of 40-130 r/min;
s23: adding the fiber into the S22 according to the proportion, and stirring for 5-30S at the speed of 40-130 r/min;
s24: and (3) adding reactive type diluted asphalt into the S23 according to the proportion, and mixing for 30-90S at the stirring speed of 40-130r/min to obtain the reactive type cold repair asphalt mixture.
In a preferred scheme, the mineral aggregate is suspension compact type or skeleton compact type, the mineral aggregate is one or more of limestone, basalt, diabase and granite, the fiber comprises one or more of polyester fiber, basalt fiber, lignin fiber, polypropylene fiber and glass fiber, the fiber length is 4-12mm, the weight of the reactive diluent and the weight of the curing agent are in the range of 100:30-100:150, the curing agent is a mixture of an alkaline additive and nano clay, the curing agent is used as a filler to replace part of mineral powder in the mixture, the weight ratio of the alkaline additive to the nano clay is 85:15-95:5, and the alkaline additive is characterized in that the alkaline additive can generate alkali after being mixed with water, and the alkaline additive contains one or more of divalent or more valence metal ions, the alkaline additive is one or more of calcium oxide (CaO), magnesium oxide (MgO), zinc oxide (ZnO) and cement, the alkaline additive is water, the weight ratio of the curing agent is one or more of kaolin, silica, polypropylene acid, sodium silicate and sodium silicate.
The reactive cold repair asphalt mixture comprises asphalt and a reactive diluent, wherein the asphalt and the reactive diluent are mixed according to a certain proportion to prepare the reactive diluent asphalt, the proportion of the asphalt to the reactive diluent is 50:50-80:20, the asphalt comprises 70 # road petroleum asphalt, 90 # road petroleum asphalt and corresponding modified asphalt, the reactive diluent is unsaturated fatty acid and saturated fatty acid mixed according to a certain proportion, the unsaturated fatty acid comprises one or more of oleic acid, linoleic acid, linolenic acid and arachidonic acid, the saturated fatty acid comprises one or more of palmitic acid, stearic acid, lauric acid and myristic acid, the proportion of the unsaturated fatty acid to the saturated fatty acid is 75:25-98:2, the iodine value of the reactive diluent is 120-180, and the Brookfield viscosity of the reactive diluent asphalt is 500-2500 mPas at 60 ℃. The reactive cold repair asphalt mixture and the preparation method thereof provided by the invention have the following technical effects:
(1) The reactive cold repair asphalt mixture can be constructed at normal temperature in rainy days or under the condition of water, has the characteristic of strong water meeting, and the alkaline additive in the curing agent reacts with the reactive diluent to generate fatty acid salt under the condition of water, so that the viscosity of the reactive asphalt mixture is rapidly improved, the asphalt mixture can form strength in a short time, the early open traffic requirement is met, the nano clay in the curing agent has the characteristic of water absorption and expansion, the gap of the mixture can be filled, the mixture is more compact, and the absorbed water can also carry out hydration reaction with cement (preferably cement), so that the water stability and the forming strength of the mixture are improved.
(2) The reactive cold repair asphalt mixture provided by the invention contains a small amount of accelerator, and the accelerator has high hydrophilic property, so that the permeability of water in the mixture can be enhanced, and the curing reaction process of the mixture is more uniform and efficient.
(3) The reactive cold repair asphalt mixture provided by the invention is added with a certain proportion of fibers, the fibers can play a reinforcement role, the cracking resistance of the mixture is improved, and meanwhile, the fibers not only have a certain elasticity, but also have the functions of adsorbing surplus free asphalt and absorbing impact energy, so that the scattering loss of the mixture is reduced, the capability of the mixture for resisting various external complex loads is improved, and the durability of the mixture is further improved.
(4) The reactive cold repair asphalt mixture has the advantages of simple preparation process, stable performance and convenience in construction, can effectively inhibit the curing reaction inside the asphalt mixture by storing the asphalt mixture in a sealed bag or a sealed barrel, keeps good storage property at normal temperature, and has the advantages of long-term storage and taking along with use.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a reactive cold repair asphalt mixture and a preparation method thereof according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
The reactive cold repair asphalt mixture comprises asphalt and a reactive diluent, wherein the asphalt and the reactive diluent are mixed according to a certain proportion to prepare the reactive diluent asphalt, the proportion of the asphalt to the reactive diluent is 50:50-80:20, the asphalt comprises 70 # road petroleum asphalt, 90 # road petroleum asphalt and corresponding modified asphalt, the reactive diluent is unsaturated fatty acid and saturated fatty acid which are mixed according to a certain proportion, the unsaturated fatty acid comprises one or more of oleic acid, linoleic acid, linolenic acid and arachidonic acid, the saturated fatty acid comprises one or more of palmitic acid, stearic acid, lauric acid and myristic acid, the proportion of the unsaturated fatty acid to the saturated fatty acid is 75:25-98:2, the iodine value of the reactive diluent is 120-180, the brookfield viscosity of the reactive diluent at 60 ℃ is 500-2500 mPa.s, and more preferably the brookfield viscosity of the reactive diluent at 60 ℃ is 1000-1500 mPa.s.
The preparation method of the reactive cold repair asphalt mixture specifically comprises the following steps:
s11: heating the asphalt to 90-120 ℃ and preserving heat for later use;
s12: premixing unsaturated fatty acid and saturated fatty acid according to a proportion to prepare a reactive diluent, and sealing and preserving at normal temperature;
s13: and (3) adding the reactive diluent in the step (S12) into the asphalt treated in the step (S11), and stirring at a speed of 100-500r/min for 30-60 minutes to obtain the reactive asphalt.
In a preferred embodiment, the reactive cold repair asphalt mixture further comprises reactive asphalt cutback, curing agent, mineral aggregate, fiber and accelerator in a weight ratio of (5.0-7.5): (0.6-2.8): (97.2-99.4): (0.2-0.35): (0.02-0.1).
In a preferred embodiment, the method specifically comprises the following steps:
s21: heating each grade of mineral aggregate to above 100deg.C, and standing at 60-100deg.C after it is completely dried;
s22, sequentially adding the dry aggregate, the curing agent and the accelerator which meet the grading requirement according to the proportion, and stirring for 5-30S at the speed of 40-130 r/min;
s23: adding the fiber into the S22 according to the proportion, and stirring for 5-30S at the speed of 40-130 r/min;
s24: and (3) adding reactive type diluted asphalt into the S23 according to the proportion, and mixing for 30-90S at the stirring speed of 40-130r/min to obtain the reactive type cold repair asphalt mixture.
The mineral aggregate grading of the reactive cold repair asphalt mixture provided by the invention is a suspension compact structure or a framework compact structure, and preferably comprises AC-16, AC-13, AC-10, AC-5, SMA-16, SMA-13 and SMA-10, and the mineral aggregate grading is shown in the following table:
in a preferred embodiment, the mineral aggregate is a suspension compact type or a skeleton compact type, and the mineral aggregate is one or more of limestone, basalt, diabase and granite.
In a preferred embodiment, the fibers comprise one or more of polyester fibers, basalt fibers, lignin fibers, polypropylene fibers, glass fibers, the fibers having a length of 4-12mm, more preferably a length of 4-8mm. The fiber can play the role of reinforcing, so that the cracking resistance of the mixture is improved. Meanwhile, the fiber has certain elasticity and the functions of absorbing surplus free asphalt and absorbing impact energy, so that the scattering loss of the mixture is reduced, the capability of the mixture for resisting various external complex loads is improved, and the durability of the mixture is further improved.
In a preferred embodiment, the curing agent is incorporated in too high an amount to reduce the storage of the reactive cold-mix asphalt. The mixing amount of the curing agent is too low, the early strength of the reactive cold repair asphalt mixture is slow to form, and the overall strength is low. Preferably, the weight ratio of the reactive diluent to the curing agent is 100:30-100:150, and further preferably, the mass ratio is 100:50-100:100, the curing agent is a mixture of an alkaline additive and nano clay, and the curing agent is used as a filler to replace part of mineral powder in the mixture.
In a preferred embodiment, the weight ratio of the alkaline additive to the nanoclay is 85:15-95:5, the alkaline additive is characterized in that the alkaline additive is capable of generating alkali when mixed with water, and the alkaline additive contains metal ions in divalent or more valence states, and the alkaline additive is one or more of calcium oxide (CaO), magnesium oxide (MgO), zinc oxide (ZnO) and portland cement, more preferably 32.5 and 42.5 portland cement.
The alkaline additive in the curing agent reacts with the reactive diluent under the condition of water to generate fatty acid salt, so that the viscosity of the reactive diluent asphalt is rapidly improved, and the asphalt mixture can form strength in a short time, thereby meeting the early-stage open traffic requirement. The nano clay in the curing agent has the characteristic of water absorption and expansion, and can not only fill the gaps of the mixture, so that the mixture is more compact, but also the absorbed water can be subjected to hydration reaction with cement, and the water stability and the molding strength of the mixture are improved.
In a preferred embodiment, the nanoclay is one or more of hectorite, montmorillonite, kaolin, silica, more preferably montmorillonite and kaolin.
In a preferred embodiment, the accelerator is one or more of sodium polyacrylate, ammonium polyacrylate and polyacrylamide. The accelerator is high-hydrophilicity solid powder particles, so that the permeability of water in the mixture can be enhanced, and the curing process is promoted, so that the reaction is more uniform and efficient.
In a preferred embodiment, the reactive cold-repairing asphalt mixture is preferably sprayed with 8-15% of water and compacted in a short time to form strength, which meets the early open traffic demand, and preferably, to accelerate the formation of the reactive cold-repairing asphalt mixture strength, the alkaline additive and water may be mixed in a ratio of 5:100-10:100, and then uniformly sprayed on the surface of the mixture in an amount of 5-15% of the mass of the mixture and compacted.
For a better understanding of the present invention, the reactive type cold-mix asphalt of the present invention and the method for preparing the same will be described in detail with reference to the following examples, but the present invention is not limited to the following examples.
Example 1
1) Reactive diluted asphalt preparation
Heating and softening asphalt at 110 ℃, adding a reactive diluent into the softened asphalt, and stirring for 45 minutes at 100 ℃ to obtain the reactive asphalt. Wherein, the asphalt is 70 grade A road petroleum asphalt, and the mixed reactive diluent accounts for 25% of the mass of the mixed solution. The reactive diluent is obtained by blending oleic acid, linoleic acid and palmitic acid according to a mass ratio of 48:44:8 (unsaturated fatty acid: saturated fatty acid=92:8), and the iodine value is 130.
2) Preparation of reactive cold repair asphalt mixture
(1) Heating mineral aggregates with different particle sizes to 135 ℃, and preserving heat at 100 ℃ after the mineral aggregates are completely dried;
(2) Heating the reactive asphalt to 60 ℃ and preserving heat;
(3) The alkaline additive and the nano clay are blended according to the mass ratio of 95:5 to prepare the curing agent, wherein the alkaline additive is 42.5 ordinary Portland cement, and the nano clay is montmorillonite. The curing agent is preserved in a dry environment;
(4) Mineral aggregates with different particle sizes are put into a stirring pot according to the grading requirement, then a curing agent and an accelerator are added and stirred for 10s at the rotating speed of 40r/min, then propylene fiber with the length of 6mm is added and stirring is continued for 10s. Wherein the mineral aggregate type is limestone, and the mineral aggregate grading adopts an AC-5 grading median value. The mixing amount of the curing agent is 1.5 percent, the mixing amount of the accelerator is 0.05 percent and the mixing amount of the fiber is 0.2 percent based on the weight of the mineral aggregate mixture (mineral aggregate plus curing agent);
(5) Pouring reactive asphalt cutback with the mineral aggregate mass of 6.0% into the step (4), blending and stirring for 60s at 100 ℃ to obtain reactive cold repair asphalt mixture, and filling the mixture into a sealed plastic bucket for storage.
Example 2
1) Reactive diluted asphalt preparation
Heating and softening asphalt at 110 ℃, adding a reactive diluent into the softened asphalt, and stirring for 45 minutes at 100 ℃ to obtain the reactive asphalt. Wherein, the asphalt is 70 grade A road petroleum asphalt, and the mixed reactive diluent accounts for 30% of the mass of the mixed solution. The reactive diluent is obtained by blending oleic acid, linoleic acid, linolenic acid and palmitic acid according to a mass ratio of 30:26:40:4 (unsaturated fatty acid: saturated fatty acid=96:4), and the iodine value is 160.
2) Preparation of reactive cold repair asphalt mixture
(1) Heating mineral aggregates with different particle sizes to 135 ℃, and preserving heat at 100 ℃ after the mineral aggregates are completely dried;
(2) Heating the reactive asphalt to 60 ℃ and preserving heat;
(3) The alkaline additive and the nano clay are blended according to the mass ratio of 95:5 to prepare the curing agent, wherein the alkaline additive is 42.5 ordinary Portland cement, and the nano clay is kaolin. The curing agent is preserved in a dry environment;
(4) Mineral aggregates with different particle sizes are put into a stirring pot according to the grading requirement, then a curing agent and an accelerator are added and stirred for 10s at the rotating speed of 40r/min, then polyester fiber with the length of 6mm is added and stirring is continued for 10s. Wherein the mineral aggregate type is limestone, and the mineral aggregate grading adopts an AC-10 grading median value. The mixing amount of the curing agent is 1.8 percent, the mixing amount of the accelerator is 0.05 percent and the mixing amount of the fiber is 0.25 percent based on the weight of the mineral aggregate mixture (mineral aggregate plus curing agent);
(5) Pouring reactive asphalt cutback with the mineral aggregate mass of 5.8% into the step (4), blending and stirring for 60s at 80 ℃ to obtain reactive cold repair asphalt mixture, and filling the mixture into a sealed plastic bucket for storage.
Example 3
1) Reactive diluted asphalt preparation
Heating and softening asphalt at 110 ℃, adding a reactive diluent into the softened asphalt, and stirring for 45 minutes at 100 ℃ to obtain the reactive asphalt. Wherein, the asphalt is grade-A road petroleum asphalt of No. 90, and the doped reactive diluent accounts for 28% of the mass of the mixed solution. The reactive diluent is obtained by blending oleic acid, linolenic acid and palmitic acid according to a mass ratio of 54:40:6 (unsaturated fatty acid: saturated fatty acid=94:6), and the iodine value is 155.
2) Preparation of reactive cold repair asphalt mixture
(1) Heating mineral aggregates with different particle sizes to 135 ℃, and preserving heat at 60 ℃ after the mineral aggregates are completely dried;
(2) Heating the reactive asphalt to 60 ℃ and preserving heat;
(3) The alkaline additive and the nanoclay are blended according to the mass ratio of 95:5 to prepare the curing agent, wherein the alkaline additive is 42.5 ordinary Portland cement, and the nanoclay is hectorite. The curing agent is preserved in a dry environment;
(4) Mineral aggregates with different particle sizes are put into a stirring pot according to the grading requirement, then a curing agent and an accelerator are added and stirred for 10s at the rotating speed of 40r/min, and then basalt fibers with the length of 4mm are added and stirred for 10s continuously. Wherein the mineral aggregate type is basalt, and the mineral aggregate grading adopts an SMA-10 grading median. The mixing amount of the curing agent is 1.8 percent, the mixing amount of the accelerator is 0.02 percent and the mixing amount of the fiber is 0.2 percent based on the weight of the mineral aggregate mixture (mineral aggregate plus curing agent);
(5) Pouring reactive asphalt cutback with the mineral aggregate mass of 6.2% into the step (4), blending and stirring for 60s at 80 ℃ to obtain reactive cold repair asphalt mixture, and filling the mixture into a sealed plastic bucket for storage.
Comparative example 1
A plasticizing rapid hardening cold patch (solvent type) produced by a company of Shandong Katsumadai is adopted.
The test pieces of examples 1-3 were sprayed with 10% by mass of water before compaction or wheel forming, whereas the test piece of comparative example 1 was a non-reactive material, and no water was sprayed before compaction or wheel forming.
Performance testing
And (3) performing performance tests on the cold-repairing asphalt mixture by referring to JTGE20-2011 'highway engineering asphalt and asphalt mixture test procedure', wherein the performance tests comprise index tests such as Marshall stability, dynamic stability, residual stability, splitting strength, scattering loss rate and the like. The test results are shown in the following table.
The Marshall test pieces used for index tests such as Marshall stability, residual stability, cleavage strength, scattering loss rate and the like are subjected to double-sided compaction 50 times by a standard Marshall compaction instrument, the molding temperature is 25 ℃, the curing temperature is 25 ℃, the diameter of the test piece is 101.6mm, and the height of the test piece is 63.5+/-1.5 mm.
The track slab test piece used for the dynamic stability index test has the dimensions of 300 multiplied by 50mm, the volume relative density of the wool is the same as that of a test piece formed by double-sided compaction of a Marshall compaction instrument for 50 times, and the forming temperature is 25 ℃. After the rutting plate test piece is molded, the rutting plate test piece is cured for 7 days at room temperature, and then the rutting plate test piece is tested by referring to the method of the T0719-2011 asphalt mixture rutting test.
The residual stability index is the Marshall stability ratio of the test group (1 day of indoor curing at 25 ℃ C., then 2 days of water bath curing at 25 ℃ C.) to the control group (1 day of indoor curing at 25 ℃ C.).
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. The reactive cold repair asphalt mixture comprises asphalt and a reactive diluent, and is characterized in that the asphalt and the reactive diluent are mixed according to a certain proportion to prepare reactive diluent asphalt, the proportion of the asphalt to the reactive diluent is 50:50-80:20, the asphalt comprises 70 # road petroleum asphalt, 90 # road petroleum asphalt and corresponding modified asphalt, the reactive diluent is unsaturated fatty acid and saturated fatty acid mixed according to a certain proportion, the unsaturated fatty acid comprises one or more of oleic acid, linoleic acid, linolenic acid and arachidonic acid, the saturated fatty acid comprises one or more of palmitic acid, stearic acid, lauric acid and myristic acid, the proportion of the unsaturated fatty acid to the saturated fatty acid is 75:25-98:2, the iodine value of the reactive diluent is 120-180, and the Brookfield viscosity of the reactive diluent asphalt at 60 ℃ is 500-2500 mPa.s;
the preparation method of the reactive type diluted asphalt specifically comprises the following steps:
s11: heating the asphalt to 90-120 ℃ and preserving heat for later use;
s12: premixing unsaturated fatty acid and saturated fatty acid according to a proportion to prepare a reactive diluent, and sealing and preserving at normal temperature;
s13: adding the reactive diluent in the step S12 into the asphalt processed in the step S11, and stirring at the speed of 100-500r/min for 30-60 minutes to obtain reactive diluted asphalt;
the reactive cold repair asphalt mixture consists of reactive type diluted asphalt, a curing agent, mineral aggregate, fibers and an accelerator according to the weight ratio of (5.0-7.5): (0.6-2.8): (97.2-99.4): (0.2-0.35): (0.02-0.1);
the preparation method of the reactive cold repair asphalt mixture specifically comprises the following steps:
s21: heating each grade of mineral aggregate to above 100deg.C, and standing at 60-100deg.C after it is completely dried;
s22, sequentially adding the dry aggregate, the curing agent and the accelerator which meet the grading requirement according to the proportion, and stirring for 5-30S at the speed of 40-130 r/min;
s23: adding the fiber into the S22 according to the proportion, and stirring for 5-30S at the speed of 40-130 r/min;
s24: adding reactive asphalt cutback into the S23 according to the proportion, and mixing for 30-90S at a stirring speed of 40-130r/min to obtain a reactive cold repair asphalt mixture;
the weight of the reactive diluent and the weight of the curing agent are in the range of 100:30-100:150, the curing agent is a mixture of an alkaline additive and nano clay, and the curing agent is used as a filler to replace part of mineral powder in the mixture;
the weight ratio of the alkaline additive to the nano clay is 85:15-95:5, and the alkaline additive is characterized in that the alkaline additive can generate alkali after being mixed with water, and the alkaline additive contains divalent or more metal ions, and is one or more of calcium oxide, magnesium oxide, zinc oxide and silicate cement.
2. A method for preparing a reactive cold repair asphalt mixture, which is used for preparing the reactive cold repair asphalt mixture according to claim 1, and is characterized by comprising the following steps:
s11: heating the asphalt to 90-120 ℃ and preserving heat for later use;
s12: premixing unsaturated fatty acid and saturated fatty acid according to a proportion to prepare a reactive diluent, and sealing and preserving at normal temperature;
s13: and (3) adding the reactive diluent in the step (S12) into the asphalt treated in the step (S11), and stirring at a speed of 100-500r/min for 30-60 minutes to obtain the reactive asphalt.
3. The preparation method of the reactive cold repair asphalt mixture according to claim 2, which is characterized by further comprising the step of preparing the reactive cold repair asphalt mixture by the weight ratio of (5.0-7.5): (0.6-2.8): (97.2-99.4): (0.2-0.35): (0.02-0.1) of reactive asphalt, a curing agent, mineral aggregate, fiber and an accelerator.
4. The method for preparing the reactive cold repair asphalt mixture according to claim 3, which is characterized by comprising the following steps:
s21: heating each grade of mineral aggregate to above 100deg.C, and standing at 60-100deg.C after it is completely dried;
s22, sequentially adding the dry aggregate, the curing agent and the accelerator which meet the grading requirement according to the proportion, and stirring for 5-30S at the speed of 40-130 r/min;
s23: adding the fiber into the S22 according to the proportion, and stirring for 5-30S at the speed of 40-130 r/min;
s24: and (3) adding reactive type diluted asphalt into the S23 according to the proportion, and mixing for 30-90S at the stirring speed of 40-130r/min to obtain the reactive type cold repair asphalt mixture.
5. The preparation method of the reactive cold repair asphalt mixture according to claim 4, wherein the mineral aggregate is suspension compact type or skeleton compact type, and the mineral aggregate is one or more of limestone, basalt, diabase and granite.
6. The preparation method of the reactive cold repair asphalt mixture according to claim 5, wherein the fibers comprise one or more of polyester fibers, basalt fibers, lignin fibers, polypropylene fibers and glass fibers, and the fiber length is 4-12mm.
7. The method for preparing a reactive cold repair asphalt mixture according to claim 6, wherein the weight of the reactive diluent and the weight of the curing agent are in the range of 100:30-100:150, the curing agent is a mixture of an alkaline additive and nanoclay, and the curing agent is used as a filler to replace part of mineral powder in the mixture.
8. The method for preparing a reactive cold repair asphalt mixture according to claim 7, wherein the weight ratio of the alkaline additive to the nanoclay is 85:15-95:5, the alkaline additive is characterized in that the alkaline additive can generate alkali after being mixed with water, and the alkaline additive contains metal ions in divalent or more valence states, and the alkaline additive is one or more of calcium oxide, magnesium oxide, zinc oxide and silicate cement.
9. The method for preparing a reactive cold repair asphalt mixture according to claim 8, wherein the nanoclay is one or more of hectorite, montmorillonite, kaolin, and silica.
10. The method for preparing the reactive cold repair asphalt mixture according to claim 9, wherein the accelerator is one or more of sodium polyacrylate, ammonium polyacrylate and polyacrylamide.
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| CN106431088A (en) * | 2016-09-18 | 2017-02-22 | 东南大学 | Preparation method of fiber and cold patch asphalt mixture |
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| US20200048466A1 (en) * | 2018-08-10 | 2020-02-13 | Billy Shane McDade | Cold Patch Asphaltic Binder |
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| CN106431088A (en) * | 2016-09-18 | 2017-02-22 | 东南大学 | Preparation method of fiber and cold patch asphalt mixture |
| CN108298897A (en) * | 2018-01-08 | 2018-07-20 | 东南大学 | A kind of cement and nano clay modified cut-back asphalt cold-repairing material |
| CN112851174A (en) * | 2021-01-21 | 2021-05-28 | 武汉工程大学 | Preparation method of chemical reaction type cold-patch asphalt mixture |
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