CN115286289A - Cold-patch asphalt mixture prepared from milling material and preparation method thereof - Google Patents
Cold-patch asphalt mixture prepared from milling material and preparation method thereof Download PDFInfo
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- CN115286289A CN115286289A CN202210097463.9A CN202210097463A CN115286289A CN 115286289 A CN115286289 A CN 115286289A CN 202210097463 A CN202210097463 A CN 202210097463A CN 115286289 A CN115286289 A CN 115286289A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 191
- 238000003801 milling Methods 0.000 title claims abstract description 135
- 239000000463 material Substances 0.000 title claims abstract description 134
- 239000000203 mixture Substances 0.000 title claims abstract description 83
- 238000002360 preparation method Methods 0.000 title claims abstract description 39
- 239000004568 cement Substances 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims description 66
- 238000010438 heat treatment Methods 0.000 claims description 32
- 238000006243 chemical reaction Methods 0.000 claims description 29
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 28
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 24
- 238000009413 insulation Methods 0.000 claims description 24
- 239000000243 solution Substances 0.000 claims description 21
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 claims description 20
- 238000005056 compaction Methods 0.000 claims description 17
- 239000003085 diluting agent Substances 0.000 claims description 17
- 239000000084 colloidal system Substances 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 229910052717 sulfur Inorganic materials 0.000 claims description 14
- 239000011593 sulfur Substances 0.000 claims description 14
- 229920005610 lignin Polymers 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 12
- 239000003995 emulsifying agent Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000012423 maintenance Methods 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 238000010008 shearing Methods 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 239000012670 alkaline solution Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002283 diesel fuel Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000006683 Mannich reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
- C08J3/091—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids characterised by the chemical constitution of the organic liquid
- C08J3/092—Hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2395/00—Bituminous materials, e.g. asphalt, tar or pitch
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/06—Sulfur
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Road Paving Structures (AREA)
Abstract
The invention belongs to the technical field of road engineering, and particularly relates to a cold patch asphalt mixture prepared from a milling material and a preparation method thereof. The cold patch asphalt mixture prepared from the milling material comprises the following components, by mass, 10-25% of modified emulsified asphalt, 30-40% of dried rough milling material, 30-40% of dried fine milling material and 10-15% of cement; the grain diameter of the dried fine milling material is controlled to be 0-10mm, and the grain diameter of the dried rough milling material is controlled to be 10-20mm; and the quality of the dried rough milling material is equal to that of the dried fine milling material.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to a cold patch asphalt mixture prepared from a milling material and a preparation method thereof.
Background
At present, the high-grade roads in China generally enter a large-scale maintenance stage, the quantity of asphalt road surface milling materials (RAP) generated every year is about 2.2 hundred million tons, and the quantity still tends to rise. Although the overall performance can not meet the use requirement, the RAP has high utilization value, and the RAP can be reused in road construction to reduce the use amount of new aggregates and new asphalt, so that the low-carbon and environment-friendly road construction and maintenance concept is met. However, even the hot mix plant recycling technology for the RAP, which is the most widely used and most effective at present, still has many technical problems to be solved, such as complicated production process, secondary aging of the RAP, insufficient fatigue performance and low temperature performance of recycled asphalt mixture, and the like.
The mixing and dissolving degree between the new asphalt and the old asphalt determines the performance of the recycled asphalt mixture, and if the mixing and dissolving of the new asphalt and the old asphalt are insufficient, RAP is only used as black aggregate in the asphalt mixture, so that the effective asphalt content is reduced, and the risk of early cracks of the recycled asphalt pavement is increased. The production process of the hot mix plant recycled asphalt mixture determines that the hot mix plant recycled asphalt mixture cannot provide sufficient mixing and dissolving time for new-old asphalt, which is also a main reason for influencing the fatigue performance and the low-temperature performance of the recycled asphalt mixture. The preparation of the storable cold-mix cold-spread recycled mixture by replacing new aggregates with RAP has better development potential: firstly, RAP has the advantages of water stability and high-temperature stability, and can provide the capabilities of resisting water damage and rutting disease for cold-mixed cold-paved regeneration mixture; secondly, the cold-mixed cold-paved recycled mixture can provide sufficient time for the mixing and dissolving of new and old asphalt, namely the function recovery of the old asphalt, in the storage period before use, so that the old asphalt in the RAP can play a role to a greater extent, and the addition of a small amount of new asphalt is possible, thereby further saving the cost; thirdly, the cold-mixed cold-paved regenerated mixture can be produced at normal temperature, is beneficial to environmental protection, and can avoid secondary heating and aging of waste materials; finally, the regenerated mixture of cold mixing and cold paving can realize 100 percent utilization of RAP, thereby saving production procedures and stone cost.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a cold patch asphalt mixture prepared from milling materials and a preparation method thereof, so as to improve the recycling value of the milling materials for the old asphalt pavement.
The invention is realized by the following technical scheme:
the cold patch asphalt mixture prepared by milling materials comprises the following components, by mass, 10-25% of modified emulsified asphalt, 30-40% of dried rough milling materials, 30-40% of dried fine milling materials and 10-15% of cement;
the grain diameter of the dried fine milling material is controlled to be 0-10mm, and the grain diameter of the dried rough milling material is controlled to be 10-20mm; and the quality of the dried rough milling material is equal to that of the dried fine milling material.
Further, the preparation method of the modified emulsified asphalt comprises the following steps:
(1) Preparation of sulfur-modified base asphalt: firstly stirring and heating the base asphalt to 130 ℃, adding a diesel oil diluent in three batches in the heating and stirring process to ensure that the asphalt liquid is melted uniformly, then adding 15 percent of sulfur powder under the stirring condition, reacting for 2 hours, and cooling to room temperature to obtain sulfur modified base asphalt;
(2) Preparation of the emulsifier: dissolving lignin and tetraethylenepentamine into an alkaline solution, stirring and heating to 100 ℃, then adding formaldehyde with the same molar weight as the tetraethylenepentamine, reacting for 3.3 hours to obtain a reaction solution, adjusting the pH value to about 3 by utilizing hydrochloric acid, and finally placing the reaction solution in an insulation box for insulation at 80 ℃;
(3) Adding the sulfur modified base asphalt obtained in the step 1 into a colloid mill, stirring by using a glass rod, removing foam, then adding the reaction solution obtained in the reaction 2, shearing by using the colloid mill for 30 seconds to obtain modified emulsified asphalt, and placing the modified emulsified asphalt in an insulation box for insulation at 80 ℃.
Further preferably, the mass ratio of the matrix asphalt, the diesel diluent and the sulfur powder in the step 1 is 2.
Further, the preparation method of the drying fine milling material and the drying rough milling material comprises the following steps: the milling material is waste asphalt mixture obtained by milling the surface layer pavement in the asphalt pavement maintenance engineering, is fully dried at 100 ℃, and is then screened by using a square hole screen to obtain a fine milling material with the particle size of 0-10mm and a coarse milling material with the particle size of 10-20mm.
A preparation method of a cold patch asphalt mixture prepared by milling and planing materials comprises the following steps:
(1) Preheating two mixers, placing dried fine milling materials and cement in the mixers, respectively heating to 80 ℃, then adding modified emulsified asphalt one by one, and stirring for half an hour;
(2) Mixing the mixture of the dried fine milling material and the modified emulsified asphalt and the mixture of the cement and the modified emulsified asphalt, stirring for 10 minutes, adding the dried rough milling material, and continuously stirring for 10 minutes to obtain a finished product of the cold patch asphalt mixture prepared from the milling material;
(3) And (3) quickly putting the uniformly mixed cold patch asphalt mixture finished product into a test die of a rotary compaction instrument, and carrying out forming compaction under the pressure of 800kPa and the internal angle of 80 times for standby application.
The invention has the beneficial effects that:
(1) According to the invention, the modified emulsified asphalt can supplement asphalt lacking in milling materials, and the gradual matching of small-particle-size and large-particle-size fillers is realized by utilizing the particle size difference among cement, dried fine milling materials and dried coarse milling materials, so that the whole cold-patch asphalt mixture forms a skeleton compact structure, the structure has good balance, the large-particle-size aggregate plays a role of a skeleton, and the small-particle-size aggregate is filled among the large-particle-size aggregates to play a role of a binder, so that the mixture has strong stability.
(2) The modified emulsified asphalt can supplement the asphalt missing in milling materials, during the process of preparing the modified emulsified asphalt, the diesel diluent is selected to provide a normal-temperature blending function and supplement light components missing in old asphalt due to aging, and the sulfur modifier is selected to perform a crosslinking reaction with the matrix asphalt, so that the matrix asphalt realizes three-dimensional structure transformation; the fluidity and the ductility of the asphalt with a three-dimensional structure can be realized by performing a Mannich reaction on lignin, tetraethylenepentamine and formaldehyde and then using the Mannich reaction as an emulsifier.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The cold patch asphalt mixture prepared from the milling material comprises the following components, by mass, 25% of modified emulsified asphalt, 30% of dried rough milling material, 30% of dried fine milling material and 15% of cement; the grain diameter of the dried fine milling material is controlled to be 0-10mm, and the grain diameter of the dried rough milling material is controlled to be 10-20mm.
The preparation method of the modified emulsified asphalt comprises the following steps:
(1) Preparation of sulfur-modified base asphalt: firstly stirring and heating the base asphalt to 130 ℃, adding a diesel oil diluent in three batches in the heating and stirring process to ensure that the asphalt liquid is melted uniformly, then adding 15 percent of sulfur powder under the stirring condition, reacting for 2 hours, and cooling to room temperature to obtain sulfur modified base asphalt; the mass ratio of the base asphalt to the diesel diluent to the sulfur powder is (2)
(2) Preparation of an emulsifier: dissolving lignin and tetraethylenepentamine into an alkaline solution, stirring and heating to 100 ℃, then adding formaldehyde with the same molar weight as the tetraethylenepentamine, reacting for 3.3 hours to obtain a reaction solution, adjusting the pH value to about 3 by using hydrochloric acid, and finally, putting the reaction solution in an incubator and keeping the temperature at 80 ℃; the mass ratio of the lignin to the tetraethylenepentamine in the step 2 is 1.3;
(3) Adding the sulfur modified base asphalt obtained in the step 1 into a colloid mill, stirring by using a glass rod, removing foam, then adding the reaction solution obtained in the reaction 2, shearing by using the colloid mill for 30 seconds to obtain modified emulsified asphalt, and placing the modified emulsified asphalt in an insulation box for insulation at 80 ℃;
in this embodiment, the milling material is a waste asphalt mixture milled from a surface road surface in an asphalt road surface maintenance project, and the milling material is fully dried at 100 ℃, and then screened by using a square-hole screen, so as to obtain a fine milling material with a particle size of 0-10mm and a coarse milling material with a particle size of 10-20mm.
A preparation method of a cold patch asphalt mixture prepared by milling materials comprises the following steps:
(1) Preheating two mixers, placing dried fine milling materials and cement in the mixers, respectively heating to 80 ℃, then adding modified emulsified asphalt one by one, and stirring for half an hour;
(2) Mixing the mixture of the dried fine milling material and the modified emulsified asphalt and the mixture of the cement and the modified emulsified asphalt, stirring for 10 minutes, adding the dried rough milling material, and continuously stirring for 10 minutes to obtain a finished cold patch asphalt mixture prepared from the milling material;
(3) And (3) quickly putting the uniformly mixed finished cold patch asphalt mixture into a test die of a rotary compaction instrument, and carrying out forming compaction under the pressure of 800kPa for 80 times at the internal angle for standby application.
Example 2
The cold patch asphalt mixture prepared from the milling material comprises the following components, by mass, 20% of modified emulsified asphalt, 35% of dried rough milling material, 35% of dried fine milling material and 10% of cement; the grain diameter of the dried fine milling material is controlled to be 0-10mm, and the grain diameter of the dried rough milling material is controlled to be 10-20mm.
The preparation method of the modified emulsified asphalt comprises the following steps:
(1) Preparation of sulfur-modified base asphalt: firstly stirring and heating the base asphalt to 130 ℃, adding the diesel diluent in three batches in the heating and stirring process to ensure that the asphalt liquid is melted uniformly, then adding 15 percent of sulfur powder under the stirring condition, reacting for 2 hours, and cooling to room temperature to obtain sulfur modified base asphalt; the mass ratio of the base asphalt to the diesel diluent to the sulfur powder is 2
(2) Preparation of the emulsifier: dissolving lignin and tetraethylenepentamine into an alkaline solution, stirring and heating to 100 ℃, then adding formaldehyde with the same molar weight as the tetraethylenepentamine, reacting for 3.3 hours to obtain a reaction solution, adjusting the pH value to about 3 by utilizing hydrochloric acid, and finally placing the reaction solution in an insulation box for insulation at 80 ℃; the mass ratio of the lignin to the tetraethylenepentamine in the step 2 is 1.3;
(3) Adding the sulfur modified base asphalt obtained in the step 1 into a colloid mill, stirring by using a glass rod, removing foam, then adding the reaction solution obtained in the reaction 2, shearing by using the colloid mill for 30 seconds to obtain modified emulsified asphalt, and placing the modified emulsified asphalt in an insulation box for insulation at 80 ℃;
in this embodiment, the milling material is a waste asphalt mixture milled from a surface road surface in an asphalt road surface maintenance project, and the milling material is fully dried at 100 ℃, and then screened by using a square-hole screen, so as to obtain a fine milling material with a particle size of 0-10mm and a coarse milling material with a particle size of 10-20mm.
A preparation method of a cold patch asphalt mixture prepared by milling materials comprises the following steps:
(1) Preheating two mixers, placing dried fine milling materials and cement in the mixers, respectively heating to 80 ℃, then adding modified emulsified asphalt one by one, and stirring for half an hour;
(2) Mixing the mixture of the dried fine milling material and the modified emulsified asphalt and the mixture of the cement and the modified emulsified asphalt, stirring for 10 minutes, adding the dried rough milling material, and continuously stirring for 10 minutes to obtain a finished product of the cold patch asphalt mixture prepared from the milling material;
(3) And (3) quickly putting the uniformly mixed cold patch asphalt mixture finished product into a test die of a rotary compaction instrument, and carrying out forming compaction under the pressure of 800kPa and the internal angle of 80 times for standby application.
Example 3
The cold patch asphalt mixture prepared from the milling material comprises the following components, by mass, 10% of modified emulsified asphalt, 40% of dried rough milling material, 40% of dried fine milling material and 10% of cement; the grain diameter of the dried fine milling material is controlled to be 0-10mm, and the grain diameter of the dried rough milling material is controlled to be 10-20mm.
The preparation method of the modified emulsified asphalt comprises the following steps:
(1) Preparation of sulfur-modified base asphalt: firstly stirring and heating the base asphalt to 130 ℃, adding the diesel diluent in three batches in the heating and stirring process to ensure that the asphalt liquid is melted uniformly, then adding 15 percent of sulfur powder under the stirring condition, reacting for 2 hours, and cooling to room temperature to obtain sulfur modified base asphalt; the mass ratio of the base asphalt to the diesel diluent to the sulfur powder is 2
(2) Preparation of the emulsifier: dissolving lignin and tetraethylenepentamine into an alkaline solution, stirring and heating to 100 ℃, then adding formaldehyde with the same molar weight as the tetraethylenepentamine, reacting for 3.3 hours to obtain a reaction solution, adjusting the pH value to about 3 by utilizing hydrochloric acid, and finally placing the reaction solution in an insulation box for insulation at 80 ℃; the mass ratio of the lignin to the tetraethylenepentamine in the step 2 is 1.3;
(3) Adding the sulfur modified base asphalt obtained in the step 1 into a colloid mill, stirring by using a glass rod, removing foam, then adding the reaction solution obtained in the reaction 2, shearing by using the colloid mill for 30 seconds to obtain modified emulsified asphalt, and placing the modified emulsified asphalt in an insulation box for insulation at 80 ℃;
in this embodiment, the milling material is a waste asphalt mixture milled from a surface road surface in an asphalt road surface maintenance project, and the milling material is fully dried at 100 ℃, and then screened by using a square-hole screen, so as to obtain a fine milling material with a particle size of 0-10mm and a coarse milling material with a particle size of 10-20mm.
A preparation method of a cold patch asphalt mixture prepared by milling and planing materials comprises the following steps:
(1) Preheating two stirring machines, placing the dried fine milling material and cement into the stirring machines, respectively heating to 80 ℃, then adding the modified emulsified asphalt one by one, and stirring for half an hour;
(2) Mixing the mixture of the dried fine milling material and the modified emulsified asphalt and the mixture of the cement and the modified emulsified asphalt, stirring for 10 minutes, adding the dried rough milling material, and continuously stirring for 10 minutes to obtain a finished cold patch asphalt mixture prepared from the milling material;
(3) And (3) quickly putting the uniformly mixed cold patch asphalt mixture finished product into a test die of a rotary compaction instrument, and carrying out forming compaction under the pressure of 800kPa and the internal angle of 80 times for standby application.
Comparative example 1
The cold patch asphalt mixture prepared from the milling material comprises the following components, by mass, 10% of modified emulsified asphalt, 40% of dried rough milling material, 40% of dried fine milling material and 10% of cement; the grain diameter of the dried fine milling material is controlled to be 0-10mm, and the grain diameter of the dried rough milling material is controlled to be 10-20mm.
The preparation method of the modified emulsified asphalt comprises the following steps:
(1) Preparation of sulfur-modified base asphalt: firstly stirring and heating the base asphalt to 130 ℃, adding a diesel oil diluent in three batches in the heating and stirring process to ensure that the asphalt liquid is melted uniformly, then adding 15 percent of sulfur powder under the stirring condition, reacting for 2 hours, and cooling to room temperature to obtain sulfur modified base asphalt; the mass ratio of the base asphalt to the diesel diluent to the sulfur powder is 2
(2) Adding the sulfur-modified base asphalt obtained in the step 1 into a colloid mill, stirring by using a glass rod, removing foam, then adding a common emulsifier, shearing by using the colloid mill for 30 seconds to obtain modified emulsified asphalt, and placing the modified emulsified asphalt in an insulation box for insulation at 80 ℃;
in this embodiment, the milling material is waste asphalt mixture milled from a surface pavement in asphalt pavement maintenance engineering, and the milling material is fully dried at 100 ℃, and then screened by using a square-hole screen to obtain a fine milling material with a particle size of 0-10mm and a coarse milling material with a particle size of 10-20mm.
A preparation method of a cold patch asphalt mixture prepared by milling materials comprises the following steps:
(1) Preheating two mixers, placing dried fine milling materials and cement in the mixers, respectively heating to 80 ℃, then adding modified emulsified asphalt one by one, and stirring for half an hour;
(2) Mixing the mixture of the dried fine milling material and the modified emulsified asphalt and the mixture of the cement and the modified emulsified asphalt, stirring for 10 minutes, adding the dried rough milling material, and continuously stirring for 10 minutes to obtain a finished cold patch asphalt mixture prepared from the milling material;
(3) And (3) quickly putting the uniformly mixed finished cold patch asphalt mixture into a test die of a rotary compaction instrument, and carrying out forming compaction under the pressure of 800kPa for 80 times at the internal angle for standby application.
Comparative example 2
The cold patch asphalt mixture prepared from the milling material comprises the following components, by mass, 10% of modified emulsified asphalt, 40% of dried rough milling material, 40% of dried fine milling material and 10% of cement; the grain diameter of the dried fine milling material is controlled to be 0-10mm, and the grain diameter of the dried rough milling material is controlled to be 10-20mm.
The preparation method of the modified emulsified asphalt comprises the following steps:
(1) Preparation of sulfur-modified base asphalt: firstly, stirring and heating matrix asphalt to 130 ℃, adding a diesel diluent in three batches in the heating and stirring process to ensure that asphalt liquid is uniformly melted, wherein the mass ratio of the matrix asphalt to the diesel diluent is 2;
(2) Preparation of an emulsifier: dissolving lignin and tetraethylenepentamine into an alkaline solution, stirring and heating to 100 ℃, then adding formaldehyde with the same molar weight as the tetraethylenepentamine, reacting for 3.3 hours to obtain a reaction solution, adjusting the pH value to about 3 by using hydrochloric acid, and finally, putting the reaction solution in an incubator and keeping the temperature at 80 ℃; the mass ratio of the lignin to the tetraethylenepentamine in the step 2 is 1.3;
(3) Adding the matrix asphalt obtained in the step 1 into a colloid mill, stirring by using a glass rod, removing foam, then adding the reaction solution obtained in the reaction 2, shearing by using the colloid mill for 30 seconds to obtain modified emulsified asphalt, and placing the modified emulsified asphalt in an insulation box for insulation at 80 ℃;
in this embodiment, the milling material is waste asphalt mixture milled from a surface pavement in asphalt pavement maintenance engineering, and the milling material is fully dried at 100 ℃, and then screened by using a square-hole screen to obtain a fine milling material with a particle size of 0-10mm and a coarse milling material with a particle size of 10-20mm.
A preparation method of a cold patch asphalt mixture prepared by milling materials comprises the following steps:
(1) Preheating two stirring machines, placing the dried fine milling material and cement into the stirring machines, respectively heating to 80 ℃, then adding the modified emulsified asphalt one by one, and stirring for half an hour;
(2) Mixing the mixture of the dried fine milling material and the modified emulsified asphalt and the mixture of the cement and the modified emulsified asphalt, stirring for 10 minutes, adding the dried rough milling material, and continuously stirring for 10 minutes to obtain a finished cold patch asphalt mixture prepared from the milling material;
(3) And (3) quickly putting the uniformly mixed cold patch asphalt mixture finished product into a test die of a rotary compaction instrument, and carrying out forming compaction under the pressure of 800kPa and the internal angle of 80 times for standby application.
Comparative example 3
The cold patch asphalt mixture prepared from the milling material comprises the following components, by mass, 10% of modified emulsified asphalt, 80% of dried rough milling material and 10% of cement; the grain diameter of the dried rough milling material is controlled to be 10-20mm.
The preparation method of the modified emulsified asphalt comprises the following steps:
(1) Preparation of sulfur-modified base asphalt: firstly stirring and heating the base asphalt to 130 ℃, adding a diesel oil diluent in three batches in the heating and stirring process to ensure that the asphalt liquid is melted uniformly, then adding 15 percent of sulfur powder under the stirring condition, reacting for 2 hours, and cooling to room temperature to obtain sulfur modified base asphalt; the mass ratio of the base asphalt to the diesel diluent to the sulfur powder is (2)
(2) Preparation of an emulsifier: dissolving lignin and tetraethylenepentamine into an alkaline solution, stirring and heating to 100 ℃, then adding formaldehyde with the same molar weight as the tetraethylenepentamine, reacting for 3.3 hours to obtain a reaction solution, adjusting the pH value to about 3 by utilizing hydrochloric acid, and finally placing the reaction solution in an insulation box for insulation at 80 ℃; the mass ratio of the lignin to the tetraethylenepentamine in the step 2 is 1.3;
(3) Adding the sulfur modified base asphalt obtained in the step 1 into a colloid mill, stirring by using a glass rod, removing foam, then adding the reaction solution obtained in the reaction 2, shearing by using the colloid mill for 30 seconds to obtain modified emulsified asphalt, and placing the modified emulsified asphalt in an insulation box for insulation at 80 ℃;
a preparation method of a cold patch asphalt mixture prepared by milling and planing materials comprises the following steps:
(1) Firstly, placing cement into a stirrer, respectively heating to 80 ℃, then adding the modified emulsified asphalt, and stirring for half an hour;
(2) Mixing the mixture of the cement and the modified emulsified asphalt, stirring for 10 minutes, adding the dried rough milling material, and continuously stirring for 10 minutes to obtain a finished product of the cold patch asphalt mixture prepared from the milling material;
(3) And (3) quickly putting the uniformly mixed cold patch asphalt mixture finished product into a test die of a rotary compaction instrument, and carrying out forming compaction under the pressure of 800kPa and the internal angle of 80 times for standby application.
And (3) performance test characterization: marshall stability test-evaluation of Strength
The marshall stability was used to evaluate the strength of the cold mix cold spread recycled mix and the test results are shown in table 4.
Preparation of a test piece: the Marshall test piece is obtained by double-sided compaction for 75 times of molding at the temperature of 25 ℃.
And (3) testing: a Marshall stability test was performed at 25 ℃ using a Marshall stability instrument with a loading rate of 50mm/min.
The results of comparative examples 1 to 3 and comparative examples 1 to 3 show that: the cold patch asphalt mixture prepared by the milling material has excellent stability under the synergistic effect of the special modifier and the emulsifier and the synergistic effect of the drying fine milling material, the drying rough milling material and the cement. The results of examples 1-3 further increased with longer storage time, indicating that miscibility of the modified emulsified asphalt with the old asphalt during storage is beneficial for improving its water stability.
Claims (5)
1. The cold patch asphalt mixture prepared from the milling material is characterized by comprising the following components, by mass, 10-25% of modified emulsified asphalt, 30-40% of dried rough milling material, 30-40% of dried fine milling material and 10-15% of cement;
the grain diameter of the dried fine milling material is controlled to be 0-10mm, and the grain diameter of the dried rough milling material is controlled to be 10-20mm; and the quality of the dried rough milling material is equal to that of the dried fine milling material.
2. The cold-patch asphalt mixture prepared by milling materials according to claim 1, wherein the preparation method of the modified emulsified asphalt comprises the following steps:
(1) Preparation of sulfur-modified base asphalt: firstly stirring and heating the base asphalt to 130 ℃, adding the diesel diluent in three batches in the heating and stirring process to ensure that the asphalt liquid is melted uniformly, then adding 15 percent of sulfur powder under the stirring condition, reacting for 2 hours, and cooling to room temperature to obtain sulfur modified base asphalt;
(2) Preparation of an emulsifier: dissolving lignin and tetraethylenepentamine into an alkaline solution, stirring and heating to 100 ℃, then adding formaldehyde with the same molar weight as the tetraethylenepentamine, reacting for 3.3 hours to obtain a reaction solution, adjusting the pH value to about 3 by using hydrochloric acid, and finally, putting the reaction solution in an incubator and keeping the temperature at 80 ℃;
(3) Adding the sulfur modified base asphalt obtained in the step 1 into a colloid mill, stirring by using a glass rod, removing foam, then adding the reaction solution obtained in the reaction 2, shearing by using the colloid mill for 30 seconds to obtain modified emulsified asphalt, and placing the modified emulsified asphalt in an insulation box for insulation at 80 ℃.
3. A cold patch asphalt mixture prepared by milling the materials according to claim 2, wherein the mass ratio of the matrix asphalt, the diesel diluent and the sulfur powder in the step 1 is 2.
4. The cold patch asphalt mixture prepared by milling the materials according to claim 1, wherein the preparation method of the dried fine milling materials and the dried rough milling materials is as follows: the milling material is waste asphalt mixture obtained by milling the surface layer pavement in the asphalt pavement maintenance engineering, is fully dried at 100 ℃, and is then screened by using a square hole screen to obtain a fine milling material with the particle size of 0-10mm and a coarse milling material with the particle size of 10-20mm.
5. Method for producing a cold-patch asphalt mix from milled material according to claims 1-4, characterised in that it comprises the following steps:
(1) Preheating two mixers, placing dried fine milling materials and cement in the mixers, respectively heating to 80 ℃, then adding modified emulsified asphalt one by one, and stirring for half an hour;
(2) Mixing the mixture of the dried fine milling material and the modified emulsified asphalt and the mixture of the cement and the modified emulsified asphalt, stirring for 10 minutes, adding the dried rough milling material, and continuously stirring for 10 minutes to obtain a finished cold patch asphalt mixture prepared from the milling material;
(3) And (3) quickly putting the uniformly mixed cold patch asphalt mixture finished product into a test die of a rotary compaction instrument, and carrying out forming compaction under the pressure of 800kPa and the internal angle of 80 times for standby application.
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| CN102765902A (en) * | 2012-08-07 | 2012-11-07 | 江苏省交通科学研究院股份有限公司 | Preparation method of emulsified asphalt cold recycling asphalt mixture |
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| EP3085731A1 (en) * | 2015-04-23 | 2016-10-26 | Colas | Modified bituminous binder emulsion |
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| CN103059585A (en) * | 2011-10-18 | 2013-04-24 | 中国石油化工股份有限公司 | Modified asphalt emulsion and preparation method thereof |
| CN102765902A (en) * | 2012-08-07 | 2012-11-07 | 江苏省交通科学研究院股份有限公司 | Preparation method of emulsified asphalt cold recycling asphalt mixture |
| EP3085731A1 (en) * | 2015-04-23 | 2016-10-26 | Colas | Modified bituminous binder emulsion |
| CN113683344A (en) * | 2021-08-18 | 2021-11-23 | 广东汇航建设工程有限公司 | Normal-temperature rapid repairing material for track disease of asphalt pavement and repairing method thereof |
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