CN116789393A - Emulsifier type cold-mixing and cold-paving asphalt mixture and preparation method thereof - Google Patents
Emulsifier type cold-mixing and cold-paving asphalt mixture and preparation method thereof Download PDFInfo
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- CN116789393A CN116789393A CN202310812371.9A CN202310812371A CN116789393A CN 116789393 A CN116789393 A CN 116789393A CN 202310812371 A CN202310812371 A CN 202310812371A CN 116789393 A CN116789393 A CN 116789393A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 386
- 239000000203 mixture Substances 0.000 title claims abstract description 264
- 239000003995 emulsifying agent Substances 0.000 title claims abstract description 52
- 238000002156 mixing Methods 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000011347 resin Substances 0.000 claims abstract description 100
- 229920005989 resin Polymers 0.000 claims abstract description 100
- 239000012764 mineral filler Substances 0.000 claims abstract description 19
- 239000000839 emulsion Substances 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 71
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 60
- 238000003756 stirring Methods 0.000 claims description 38
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 32
- -1 propylene organic compound Chemical class 0.000 claims description 27
- 238000004132 cross linking Methods 0.000 claims description 23
- 238000006757 chemical reactions by type Methods 0.000 claims description 22
- 239000003431 cross linking reagent Substances 0.000 claims description 20
- 239000003999 initiator Substances 0.000 claims description 20
- 238000010521 absorption reaction Methods 0.000 claims description 14
- 239000003607 modifier Substances 0.000 claims description 13
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical group C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 10
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 7
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 7
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 abstract description 23
- 230000007547 defect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 9
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 description 8
- 239000011707 mineral Substances 0.000 description 8
- 150000002894 organic compounds Chemical class 0.000 description 8
- 239000000843 powder Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 235000019738 Limestone Nutrition 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 238000005336 cracking Methods 0.000 description 6
- 239000006028 limestone Substances 0.000 description 6
- 238000006116 polymerization reaction Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004064 recycling Methods 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 239000004575 stone Substances 0.000 description 6
- 239000000376 reactant Substances 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 238000010257 thawing Methods 0.000 description 3
- 230000003313 weakening effect Effects 0.000 description 3
- 238000011049 filling Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000004971 Cross linker Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
-
- 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
- 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
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses an emulsifier type cold-mixing cold-paving asphalt mixture and a preparation method thereof, wherein the emulsifier type cold-mixing cold-paving asphalt mixture comprises, by mass, 400-600 parts of coarse aggregate, 400-600 parts of fine aggregate, 90-160 parts of modified emulsified asphalt, 10-30 parts of mineral filler and 2-8 parts of water-reactive resin demulsifier; wherein the molecular weight of the water-reactive resin demulsifier is 100-1000 ten thousand. The emulsion type cold-mixing and cold-paving asphalt mixture provided by the scheme accelerates the early strength forming speed of the asphalt mixture on the premise of not using cement and guaranteeing the road performance, and solves the technical problem that the pavement paved by the asphalt mixture added with cement in the prior art is difficult to recover, so as to overcome the defects in the prior art.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to an emulsifier type cold-mixing and cold-paving asphalt mixture and a preparation method thereof.
Background
Compared with the hot-mix asphalt pavement technology, the cold-mix asphalt pavement technology is the most energy-saving and environment-friendly technology. Based on the characteristics of the cold-mixed asphalt raw material, the asphalt mixture can be produced and constructed at normal temperature, and compared with the traditional hot-mixed hot-laid asphalt mixture, the energy consumption in the heating process of aggregate and asphalt is reduced, so that the low energy consumption, small emission and light pollution in road construction are realized, and the asphalt mixture has the advantages of being accepted by masses and road workers.
At present, cold-mixing and cold-paving asphalt mixtures in road construction and maintenance mainly have two main types, namely solvent-type cold-mixing and cold-paving asphalt mixtures, and the solvent-type cold-mixing and cold-paving asphalt mixtures mainly use different solvents to dilute viscous asphalt so as to enable the viscous asphalt to reach a flowing state, and can realize mixing, paving and compacting at normal temperature. The other type is an emulsifier type cold-mixing and cold-paving asphalt mixture, which is mainly prepared by using emulsified asphalt as a cementing material, so as to realize construction at normal temperature.
Because the solvent adopted by the solvent type cold mix asphalt mixture has volatility and larger pollution, the solvent type cold mix asphalt mixture is mainly used for emergency repair of pits and grooves at present, and is rarely used in road construction in a large area. The traditional emulsifier type cold-mixing and cold-paving asphalt mixture takes emulsified asphalt as a binder, has the advantages of convenient construction, low energy consumption, less pollution, low construction condition requirement and the like, but the residual moisture of the emulsified asphalt after demulsification is difficult to drain away in time, so that the water loss rate of the asphalt pavement paved by the emulsified asphalt mixture for curing for 24 hours at 110 ℃ is only 87-93%, and the adhesiveness between the emulsified asphalt and aggregate is poor due to excessive free water, so that the early strength of the cold-mixing and cold-paving asphalt mixture is lower, and the use requirement that the water loss rate of the asphalt pavement for curing for 24 hours at 110 ℃ is higher than 98% cannot be met. Therefore, the conventional emulsifier type cold mix and cold spread asphalt mixture is only limited to be applied to local repair and surface repair of pavement and the like. In addition, in the traditional emulsifier type cold-mix and cold-mix asphalt mixture, the demulsification speed of emulsified asphalt is low, so that the early strength forming speed of the cold-mix and cold-mix asphalt mixture is also low, and the opening time of an asphalt pavement is long.
In the prior art, in order to break through the use limitation of the traditional emulsifier type cold-mix and cold-spread asphalt mixture and shorten the time for realizing opening of an asphalt pavement, cement is usually added into the emulsifier type cold-mix and cold-spread asphalt mixture as a curing agent to consume the water in emulsified asphalt, so that the early strength of the asphalt mixture is improved, and the asphalt mixture meets the opening requirement of the asphalt pavement; meanwhile, the water consumption speed in the emulsified asphalt can be increased by adding cement, so that the early strength forming speed is increased, and the asphalt pavement can be opened as soon as possible. However, after cement is added, the emulsifier type cold-mix cold-laid asphalt mixture becomes brittle in the long-term use process, and the cracking resistance is reduced, so that cracks are generated on the asphalt pavement, the pavement performance is reduced, and the use requirement of the existing asphalt pavement cannot be met. In addition, cement is added into the asphalt mixture, so that the later recovery of the asphalt pavement is difficult, and the recycling of the asphalt mixture is not facilitated.
Disclosure of Invention
The invention aims to provide an emulsifier type cold-mix and cold-spread asphalt mixture, which can accelerate the early strength formation speed of the asphalt mixture on the premise of not using cement and ensuring the road performance of the asphalt mixture, and solve the technical problem that the pavement paved by the asphalt mixture added with cement is difficult to recover in the prior art, so as to overcome the defects in the prior art.
The second purpose of the invention is to provide a preparation method of the emulsifier type cold-mix cold-laid asphalt mixture, which is simple in preparation method and strong in operability, and is beneficial to avoiding weakening of the relevant performance of the asphalt mixture in the preparation process and beneficial to later recycling.
To achieve the purpose, the invention adopts the following technical scheme:
an emulsifier type cold-mixing and cold-paving asphalt mixture comprises, by mass, 400-600 parts of coarse aggregate, 400-600 parts of fine aggregate, 90-160 parts of modified emulsified asphalt, 10-30 parts of mineral filler and 2-8 parts of water-reactive resin demulsifier; wherein the molecular weight of the water-reactive resin demulsifier is 100-1000 ten thousand.
Further, the crosslinking degree of the water-reactive resin demulsifier is 0.05-1.0%;
the molecular weight of the water-reactive resin demulsifier is 200-700 ten thousand.
Further, the water-absorbing capacity of the water-reactive resin demulsifier is 30 to 100.
Further, the water-reactive resin demulsifier comprises a hydrophilic propylene organic compound, sodium hydroxide, water, an initiator and a crosslinking agent.
Further, the mass mixing ratio of the hydrophilic propylene-based organic compound to the sodium hydroxide is (1.5 to 2): 1, a step of;
The mass mixing ratio of the initiator to the hydrophilic propylene organic compound is (2-3): 2000;
the mass mixing ratio of the cross-linking agent to the hydrophilic propylene organic compound is (3-5): 4000.
further, the hydrophilic propylene-based organic compound includes any one or a combination of two of acrylic acid and acrylamide;
the initiator comprises any one or the combination of two of sodium persulfate and ammonium persulfate;
the cross-linking agent is divinylbenzene.
Further, according to the mass percentage, the solid content of the modified emulsified asphalt is 62-65%;
the modified emulsified asphalt comprises an SBS modifier, and the addition amount of the SBS modifier is more than or equal to 8% according to the mass percentage;
the modified emulsified asphalt comprises any one of star-type SBS modified asphalt or linear SBS modified asphalt.
Further, the elastic recovery of the modified emulsified asphalt at 25 ℃ is more than or equal to 95%, and the composite shear modulus G at 60 DEG C ＊ More than or equal to 10KPa,60 ℃ dynamic viscosity more than or equal to 4 ten thousand Pa.s, G of evaporation residue ＊ The sin delta is more than or equal to 2.2kPa, and the critical temperature is more than or equal to 88 ℃.
The preparation method of the emulsifier type cold-mix cold-laid asphalt mixture is used for preparing the emulsifier type cold-mix cold-laid asphalt mixture and comprises the following steps of:
A. Stirring the coarse aggregate and the fine aggregate to obtain a first mixed aggregate;
B. adding the modified emulsified asphalt and mineral filler into the first mixed aggregate, and stirring to obtain a second mixed aggregate;
C. adding the water-reactive resin demulsifier into the second mixed aggregate, and stirring to obtain an emulsifier type cold-mix cold-laid asphalt mixture;
D. compacting the prepared emulsifier type cold-mixed and cold-paved asphalt mixture at normal temperature, and curing for 11-13 h at 110 ℃.
Further, the stirring time in the step A is 20-40 s; the stirring time of the step B is 50-70 s, the stirring time of the step C is 20-60 s, and the total stirring time of the steps A, B and C is more than or equal to 108s.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
1. the water reaction type resin demulsifier takes moisture in the modified emulsified asphalt as a reactant and forms firm hydrogen bonds with the moisture in the modified emulsified asphalt, so that the modified emulsified asphalt is demulsified, an asphalt film is formed on the surface of an aggregate to wrap and bond the aggregate, the asphalt mixture is bonded to form a whole, the early strength of the asphalt mixture is ensured, the phenomenon that residual moisture after demulsification of the modified emulsified asphalt cannot be timely discharged, the adhesiveness between the emulsified asphalt and the aggregate is poor due to excessive free water, and the early strength of the cold-mix and cold-spread asphalt mixture is affected is avoided; meanwhile, the water-reactive resin demulsifier can be solidified and provide certain strength in the process of demulsification of the modified emulsified asphalt so as to ensure the early strength of the asphalt mixture. In addition, because the water reaction type resin demulsifier takes the water in the modified emulsified asphalt as a reactant, the water consumption speed in the modified emulsified asphalt is high, the normal-temperature demulsification of the emulsified asphalt can be accelerated, and the early strength forming speed of the asphalt mixture can be improved under the condition that cement is not added; besides, cement is not used, so that the later recycling is facilitated, and the situation that the emulsifier type cold-mixed and cold-paved asphalt mixture becomes brittle in the long-term use process, the cracking resistance is reduced, the asphalt pavement is cracked, and the road performance is reduced is avoided.
2. Because the early strength of the asphalt mixture and the forming speed of the early strength are greatly influenced by the water reaction type resin demulsifier, when the common water reaction type resin demulsifier is adopted, the modified emulsified asphalt is insufficient in demulsification, so that the modified emulsified asphalt cannot wrap and adhere aggregates well, the early strength cannot be ensured, and meanwhile, the demulsification speed is also slower, so that the forming speed of the early strength is slow, and therefore, the scheme ensures the performance of the asphalt mixture by controlling the molecular weight of the water reaction type resin demulsifier to ensure that the molecular weight of the water reaction type resin demulsifier reaches 100-1000 ten thousand. If the molecular weight of the water-reactive resin demulsifier is more than 1000 ten thousand, the reaction speed of the water-reactive resin demulsifier and the modified emulsified asphalt is too high, so that the modified emulsified asphalt cannot wrap and bond the aggregates well, the bonding performance between the modified emulsified asphalt and the aggregates is poor, the thickness of asphalt film between the aggregates is greatly reduced, the early strength of asphalt mixture is reduced, and the road performance cannot be ensured; if the molecular weight of the water-reactive resin demulsifier is less than 100 ten thousand, the reaction rate with water in emulsified asphalt is slow, and the expected early strength formation speed cannot be obtained.
3. The preparation method of the emulsifier type cold-mix cold-laid asphalt mixture has the advantages of simple steps and strong operability, is beneficial to avoiding weakening the relevant performance of the asphalt mixture in the preparation process, and is beneficial to later recycling.
Detailed Description
The technical scheme provides an emulsifier type cold-mix cold-laid asphalt mixture, which comprises, by mass, 400-600 parts of coarse aggregate, 400-600 parts of fine aggregate, 90-160 parts of modified emulsified asphalt, 10-30 parts of mineral filler and 2-8 parts of water-reactive resin demulsifier; wherein the molecular weight of the water-reactive resin demulsifier is 100-1000 ten thousand.
In order to accelerate the early strength formation of the asphalt mixture without using cement and ensuring the road performance of the asphalt mixture and solve the technical problem that the pavement paved by the asphalt mixture added with cement is difficult to recover in the prior art, the technical scheme provides an emulsifier type cold-mix cold-paving asphalt mixture, which comprises raw materials of coarse aggregate, fine aggregate, modified emulsified asphalt, mineral filler and water-reactive resin demulsifier.
Firstly, the water reaction type resin demulsifier takes moisture in modified emulsified asphalt as a reactant and forms firm hydrogen bond with the moisture in the modified emulsified asphalt, so that the modified emulsified asphalt is demulsified, an asphalt film is formed on the surface of aggregate to wrap and bond the aggregate, the asphalt mixture is bonded to form a whole, the early strength of the asphalt mixture is ensured, the phenomenon that residual moisture after demulsification of the modified emulsified asphalt cannot be discharged in time, the adhesiveness between the emulsified asphalt and the aggregate is poor due to excessive free water, and the early strength of the cold-mix and cold-spread asphalt mixture is affected is avoided; meanwhile, the water-reactive resin demulsifier can be solidified and provide certain strength in the process of demulsification of the modified emulsified asphalt so as to ensure the early strength of the asphalt mixture. In addition, because the water reaction type resin demulsifier takes the water in the modified emulsified asphalt as a reactant, the water consumption speed in the modified emulsified asphalt is high, the normal-temperature demulsification of the emulsified asphalt can be accelerated, and the early strength forming speed of the asphalt mixture can be improved under the condition that cement is not added; besides, cement is not used, so that the later recycling is facilitated, and the situation that the emulsifier type cold-mixed and cold-paved asphalt mixture becomes brittle in the long-term use process, the cracking resistance is reduced, the asphalt pavement is cracked, and the road performance is reduced is avoided.
Because the early strength of the asphalt mixture and the forming speed of the early strength are greatly influenced by the water reaction type resin demulsifier, when the common water reaction type resin demulsifier is adopted, the modified emulsified asphalt is insufficient in demulsification, so that the modified emulsified asphalt cannot wrap and adhere aggregates well, the early strength cannot be ensured, and meanwhile, the demulsification speed is also slower, so that the forming speed of the early strength is slow, and therefore, the scheme ensures the performance of the asphalt mixture by controlling the molecular weight of the water reaction type resin demulsifier to ensure that the molecular weight of the water reaction type resin demulsifier reaches 100-1000 ten thousand. If the molecular weight of the water-reactive resin demulsifier is more than 1000 ten thousand, the reaction speed of the water-reactive resin demulsifier and the modified emulsified asphalt is too high, so that the modified emulsified asphalt cannot wrap and bond the aggregates well, the bonding performance between the modified emulsified asphalt and the aggregates is poor, the thickness of asphalt film between the aggregates is greatly reduced, the early strength of asphalt mixture is reduced, and the road performance cannot be ensured; if the molecular weight of the water-reactive resin demulsifier is less than 100 ten thousand, the reaction rate with water in emulsified asphalt is slow, and the expected early strength formation speed cannot be obtained.
Further, the asphalt mixture in the technical scheme also comprises coarse aggregates and fine aggregates, the coarse aggregates and the fine aggregates in the asphalt mixture form the key of a skeleton structure, the coarse aggregates are mutually embedded and extruded to form the skeleton of the asphalt mixture, the effect of supporting the asphalt mixture is provided, the fine aggregates can fill the skeleton, and the strength and the stability of the skeleton structure are ensured; meanwhile, the coarse aggregate has rough surface and low water absorption rate, is beneficial to increasing the adhesiveness between the coarse aggregate and modified emulsified asphalt, ensures the strength of asphalt mixture, and further ensures the road performance of the asphalt mixture.
Furthermore, in the technical scheme, the modified emulsified asphalt is demulsified under the action of the water reaction type resin demulsifier, and is adhered to the surface of the aggregate to form an asphalt film to wrap the aggregate, so that the asphalt mixture is adhered to form a whole, the strength of the asphalt mixture is ensured, the asphalt mixture can be deformed under high and low temperature environments to prevent damage to the asphalt mixture, and the road performance of the asphalt mixture is further ensured.
In addition, mineral filler is added into the asphalt mixture to effectively increase the thickness of the asphalt film, so that the anti-aging capability is improved, in addition, the asphalt mixture and modified emulsified asphalt are combined into asphalt cement, the residual gaps of the mixture framework are filled, the effects of sealing the gaps and transmitting load are achieved, the pavement is ensured to have good shearing resistance and bonding strength, and the road performance of the asphalt mixture is further ensured.
Preferably, mineral fillers in the technical scheme are mineral powder, and the mineral powder has high adsorption capacity to asphalt due to large surface area, and the mineral powder is used as the fillers in the scheme, so that the thickness of the asphalt film can be effectively increased, the strength of an asphalt mixture is improved, and the road performance of the asphalt mixture is further ensured.
The coarse aggregate adopted in the technical scheme can be diabase crushed stone, and the fine aggregate can be limestone machine-made sand, so that the method is not limited.
According to the mass portion, the asphalt mixture of the scheme comprises 400-600 portions of coarse aggregate, 400-600 portions of fine aggregate, 90-160 portions of modified emulsified asphalt, 10-30 portions of mineral filler and 2-8 portions of water reaction type resin demulsifier.
The water reaction type resin demulsifier takes the water in the modified emulsified asphalt as a reactant, and the modified emulsified asphalt is demulsified at normal temperature through a physical-chemical reaction, so that the early strength of the asphalt mixture is ensured, the road performance of the asphalt mixture is ensured, and the forming speed of the early strength of the asphalt mixture is accelerated. When the addition amount of the water reaction type resin demulsifier is less than 2 parts, the demulsification of the modified emulsified asphalt is too slow, so that the normal-temperature forming of the asphalt mixture is slower, and the early strength forming speed of the asphalt mixture is influenced; meanwhile, the modified emulsified asphalt is too slow in demulsification, and the modified emulsified asphalt is insufficient in binding force on aggregate, so that the aggregate and the modified emulsified asphalt cannot be bonded into a whole, the early strength of an asphalt mixture is affected, and the road performance of the asphalt mixture is insufficient; when the addition amount of the water reaction type resin demulsifier is more than 8 parts, the demulsification of the modified emulsified asphalt is faster, so that the modified emulsified asphalt can not completely coat the aggregates and is demulsified between the aggregates, the aggregate bonding effect can not be better achieved, a large number of adhesive interfaces between the modified emulsified asphalt and the aggregates are invalid, the early strength of the asphalt mixture is also influenced, and the road performance is insufficient.
The modified emulsified asphalt mainly wraps and bonds aggregates to form an integral asphalt mixture, so that the early strength of the asphalt mixture is ensured, and the asphalt mixture can be deformed in a high-low temperature environment to prevent damage and improve the performance of the asphalt mixture. When the addition amount of the modified emulsified asphalt is more than 160 parts, the asphalt film thickness between aggregates is too thick due to the excessive amount of the modified emulsified asphalt, so that the aggregates are difficult to extrude and form, and the early strength of the asphalt mixture is affected; in addition, the asphalt mixture has insufficient shearing force resistance due to overlarge thickness of asphalt film among aggregates, and meanwhile, the problems of oil flooding, rutting and the like can also be generated, so that the road performance is affected; when the addition amount of the modified emulsified asphalt is less than 90 parts, the adhesion force of the modified emulsified asphalt to aggregate is insufficient, the internal bonding strength of the asphalt mixture is insufficient, the early strength of the asphalt mixture is affected, and the road performance is insufficient.
The coarse aggregate forms a skeleton structure and plays a role in supporting the asphalt mixture, so that the addition amount of the coarse aggregate is limited to 400-600 parts, if the addition amount of the coarse aggregate is more than 600 parts, the internal gap of the asphalt mixture is enlarged, and under the condition that the use amount of the fine aggregate and the modified emulsified asphalt is kept unchanged, the modified emulsified asphalt coated with the aggregate is reduced, so that the bonding strength among the aggregates in the asphalt mixture is seriously influenced, and the road performance of the asphalt mixture is influenced; if the addition amount of coarse aggregate is less than 400 parts, the modified emulsified asphalt and the fine aggregate in the asphalt mixture are excessive, so that the interior of the asphalt mixture is too compact, a framework structure is difficult to form, and problems of oil bleeding, pushing and the like can be generated when the asphalt mixture is used for paving a road surface, so that the road performance is influenced.
The fine aggregate mainly plays roles of filling the skeleton structure and ensuring the bonding strength of the asphalt mixture, so that the addition amount of the fine aggregate is limited to 400-600 parts, if the addition amount of the fine aggregate is more than 600 parts, a strong enough skeleton embedding effect cannot be formed between coarse aggregates, so that the strength and the stability of the asphalt mixture are weakened, and meanwhile, asphalt cement consisting of modified emulsified asphalt and mineral fillers is overflowed, the bonding strength and the shearing resistance of the asphalt mixture are influenced, and the road performance of the asphalt mixture is influenced; if the addition amount of the fine aggregate is less than 400 parts, too many gaps in the mixture are caused, the framework structure cannot be fully filled, the strength and stability of the framework structure are affected, and finally the early strength and the shearing resistance of the asphalt mixture are affected, so that the road performance of the asphalt mixture is affected.
The mineral filler is one of raw materials for forming gaps of the framework structure of the asphalt cement filling mixture, when the addition amount of the mineral filler is less than 10 parts, the mineral filler and the modified emulsified asphalt can not form asphalt cement with sufficient strength, the adhesiveness is reduced, aggregates are difficult to bond together, and the early strength of the asphalt mixture is affected; when the addition amount of mineral filler is more than 30 parts, the aggregates are difficult to extrude and form, the early strength of the asphalt mixture is affected, the thickness of an oil film between the aggregates is too large, the shearing resistance of the asphalt mixture is insufficient, meanwhile, the problems of oil flooding, rutting and the like are also caused, and the road performance is affected.
Further, the crosslinking degree of the water-reactive resin demulsifier is 0.05 to 1.0%;
the molecular weight of the water-reactive resin demulsifier is 200-700 ten thousand.
The degree of crosslinking refers to the degree of interconnection between polymer molecular chains through chemical bonds or physical bonds, which determines the structural strength and swelling properties of the water-reactive resin demulsifier, and proper degree of crosslinking helps to ensure the demulsification function of the water-reactive resin demulsifier. If the crosslinking degree of the water-reactive resin demulsifier is more than 1.0%, the number of crosslinking points is increased, and the internal rotation of single bonds of the crosslinking points is gradually lost due to the shortened crosslinking interval, so that the realization of the demulsification function of the water-reactive resin demulsifier is greatly limited; if the crosslinking degree of the water-reactive resin demulsifier is less than 0.05%, on one hand, the molecular chain of the water-reactive resin demulsifier is expanded or even broken due to permeation of water molecules to influence realization of demulsification function of the water-reactive resin demulsifier, on the other hand, the water-reactive resin demulsifier is too fast in demulsification speed, so that demulsification is obviously uneven to influence early strength and early strength forming speed of asphalt mixture, and meanwhile, road performance and durability such as cracking resistance and impact resistance of asphalt are influenced, so that in one embodiment of the technical scheme, the crosslinking degree of the water-reactive resin demulsifier is 0.05-1.0%, higher early strength of the asphalt mixture is ensured, road performance of the asphalt mixture is further ensured, and meanwhile, the early strength forming speed is improved.
In a preferred embodiment of the present technical solution, the molecular weight of the water-reactive resin demulsifier is 200 to 700 ten thousand, so as to further ensure the early strength of the asphalt mixture and ensure the road performance; at the same time, the rate of early strength development is increased.
Further, the water-absorbing capacity of the water-reactive resin demulsifier is 30 to 100.
The water absorption rate refers to the amount of water that can be consumed by a unit dose of the water-reactive resin demulsifier, which reflects the hydrophilic performance of the water-reactive resin demulsifier and determines the demulsification rate of the water-reactive resin demulsifier. If the water absorption rate of the water-reactive resin demulsifier is more than 100, the demulsification of the modified emulsified asphalt is faster, the adhesion of the modified emulsified asphalt to aggregate is influenced, the bonding strength in the asphalt mixture is insufficient, the early strength of the asphalt mixture is influenced, and the road performance is influenced; if the water absorption ratio of the water-reactive resin demulsifier is less than 30, the reaction rate of the water-reactive resin demulsifier with the modified emulsified asphalt becomes slow, and the early strength forming speed is affected, so in another embodiment of the technical scheme, the water absorption ratio of the water-reactive resin demulsifier is 30-100, so that the road performance of the asphalt mixture and the early strength forming speed are further ensured.
Further illustratively, the water-reactive resin demulsifier includes a hydrophilic propylene-based organic compound, sodium hydroxide, water, an initiator, and a crosslinker.
In one embodiment of the technical scheme, the raw materials of the water-reactive resin demulsifier comprise hydrophilic propylene organic compounds, sodium hydroxide, water, an initiator and a cross-linking agent, and the water is used as a solvent to dissolve the sodium hydroxide to obtain a sodium hydroxide solution, so that impurities in the sodium hydroxide are removed; the sodium hydroxide and the hydrophilic propylene organic compound are subjected to chemical reaction to generate propylene salt, so that the hydrophilicity and reactivity of the hydrophilic propylene organic compound are improved, the hydrophilic propylene organic compound is subjected to polymerization reaction under the action of an initiator and a cross-linking agent to generate the water-reactive resin demulsifier with a three-dimensional network structure, and the water-reactive resin demulsifier is ensured to have molecular weight, cross-linking degree and water absorption multiplying power within an expected range, and good mechanical strength and stability. If sodium hydroxide is not added, the hydrophilic propylene organic compound is directly subjected to polymerization reaction under the action of an initiator and a crosslinking agent, so that the polymerization reaction is incomplete, the polymerization reaction rate is low, the performances of the water absorption reaction type resin demulsifier such as molecular weight, crosslinking degree and water absorption multiplying power are influenced, and finally the road performance and early strength forming speed of the asphalt mixture are influenced.
Further, the mixing ratio by mass of the hydrophilic propylene-based organic compound to the sodium hydroxide is (1.5 to 2): 1, a step of;
the mass mixing ratio of the initiator to the hydrophilic propylene organic compound is (2-3): 2000;
the mass mixing ratio of the cross-linking agent to the hydrophilic propylene organic compound is (3-5): 4000.
in one embodiment of the present technical solution, the mixing ratio by mass of the hydrophilic propylene-based organic compound to sodium hydroxide is preferably (1.5 to 2): 1, the hydrophilic propylene organic compound and sodium hydroxide are completely reacted, and the hydrophilicity and the reactivity of the hydrophilic propylene organic compound are improved. If the mass mixing ratio of the hydrophilic propylene organic compound to the sodium hydroxide is less than 1.5:1, hydroxyl ions which are not completely reacted are easily caused in the solution, so that the pH value of the solution is increased, the reaction condition is unstable and difficult to control, the subsequent polymerization of the hydrophilic propylene organic compound is unfavorable for influencing the performances of molecular weight, water absorption rate and the like of the water reaction type resin demulsifier, and finally, the road performance and early strength forming speed of the asphalt mixture are influenced; if the mass mixing ratio of the hydrophilic propylene organic compound to the sodium hydroxide is more than 2:1, the hydrophilic propylene organic compound is not fully reacted, and the non-neutralized hydrophilic group exists, so that the hydrophilic property and the reactivity of the hydrophilic propylene organic compound are not improved, the performances of the water-reactive resin demulsifier such as the molecular weight, the water absorption rate and the like are affected, and the road performance and the early strength forming speed of the asphalt mixture are finally affected.
In another embodiment of the present technical solution, the mass mixing ratio of the initiator to the hydrophilic propylene-based organic compound is preferably (2 to 3): 2000, and the mass mixing ratio of the crosslinking agent to the hydrophilic propylene-based organic compound is preferably (3 to 5): 4000, ensuring proper crosslinking degree of the water-reactive resin demulsifier, further ensuring higher early strength of the asphalt mixture, further ensuring road performance of the asphalt mixture and improving early strength forming speed. If the addition amount of the initiator and the cross-linking agent is too small, the cross-linking degree of the obtained water-reactive resin demulsifier is easily insufficient, and the cross-linking degree determines the structural strength and the swelling performance of the water-reactive resin demulsifier, so if the addition amount of the initiator and the cross-linking agent is too small, the molecular chain of the obtained water-reactive resin demulsifier is easily swelled and even broken due to the penetration of water molecules, the water-reactive resin demulsifier is dissolved in water, the demulsification function is weakened, and the demulsification function has a large influence on the early strength and the early strength of the asphalt mixture, and therefore, the addition amount of the initiator and the cross-linking agent is too small, and the road performance and the formation speed of the early strength of the asphalt mixture are also influenced; if the addition amount of the initiator and the cross-linking agent is too large, the cross-linking degree of the obtained water-reactive resin demulsifier is too large, the realization of the demulsification function of the water-reactive resin demulsifier is limited, and the road performance and the early strength forming speed of the asphalt mixture are also influenced.
Further, the hydrophilic propylene-based organic compound includes any one or a combination of two of acrylic acid and acrylamide;
the initiator comprises any one or the combination of two of sodium persulfate and ammonium persulfate;
the cross-linking agent is divinylbenzene.
In a preferred embodiment of the present invention, the hydrophilic acrylic organic compound includes any one or a combination of two of acrylic acid and acrylamide, the acrylic acid contains a carboxyl group having a hydrophilic group, the acrylamide contains an amide group having a hydrophilic group, and the water-reactive resin demulsifier obtained by polymerization reaction of the acrylic organic compound is endowed with good hydrophilicity, so that the reaction rate of the water-reactive resin demulsifier with the modified emulsified asphalt is increased, and the speed of forming early strength is increased.
Because the sodium persulfate and the ammonium persulfate have the characteristics of good stability at normal temperature, convenient storage, convenient use and safety, in another preferred embodiment of the technical scheme, any one or two of the sodium persulfate and the ammonium persulfate are used as the initiator, so that the crosslinking degree of the water-reactive resin demulsifier meets the actual requirement, and meanwhile, the storage and the use are convenient.
In another preferred embodiment of the present invention, the crosslinking agent is preferably divinylbenzene to meet the crosslinking degree requirements of the water reactive resin demulsifier because of the different reactivity and crosslinking efficiency of the different crosslinking agents.
Further, according to the mass percentage, the solid content of the modified emulsified asphalt is 62-65%;
the modified emulsified asphalt comprises an SBS modifier, and the addition amount of the SBS modifier is more than or equal to 8% according to the mass percentage;
the modified emulsified asphalt comprises any one of star-type SBS modified asphalt or linear SBS modified asphalt.
In a preferred embodiment of the technical scheme, the modified emulsified asphalt has a solid content of 62-65% by mass, and the viscoelastic performance of the modified emulsified asphalt is further improved, so that the early strength of the asphalt mixture is further improved, and the road performance of the asphalt mixture is further improved. If the solid content of the modified asphalt is not in the range, the emulsification performance, stability, viscosity and high-temperature performance of the modified emulsified asphalt are affected, so that the rutting resistance, cracking resistance and other road performances of an asphalt pavement formed by the asphalt mixture are affected.
In another preferred embodiment of the technical scheme, the modified emulsified asphalt comprises an SBS modifier, and the addition amount of the SBS modifier is more than or equal to 8% by mass percent, so that the early strength of the asphalt mixture is further improved, and the road performance of the asphalt mixture is further improved.
Preferably, the modified emulsified asphalt comprises an SBS modifier, and the addition amount of the SBS modifier is more than or equal to 10% by mass percent.
More preferably, in one embodiment of the present technical solution, the modified emulsified asphalt includes any one of a star SBS modified asphalt or a linear SBS modified asphalt, and the star SBS modified asphalt or the linear SBS modified asphalt not only can adhere to the surface of the aggregate at normal temperature to form an asphalt film to wrap and adhere the aggregate, so that the asphalt mixture is adhered to form a whole, ensuring that the asphalt mixture has better early strength, but also has excellent viscoelastic performance, and further improving the early strength of the asphalt mixture, thereby improving the road performance thereof.
Further illustrates that the elastic recovery of the modified emulsified asphalt at 25 ℃ is more than or equal to 95 percent, and the composite shear modulus G at 60 DEG C ＊ More than or equal to 10KPa,60 ℃ dynamic viscosity more than or equal to 4 ten thousand Pa.s, G of evaporation residue ＊ The sin delta is more than or equal to 2.2kPa, and the critical temperature is more than or equal to 88 ℃.
In a preferred embodiment of the technical scheme, the elastic recovery of the modified emulsified asphalt at 25 ℃ is more than or equal to 95 percent, the composite shear modulus G is more than or equal to 10KPa at 60 ℃, the dynamic viscosity at 60 ℃ is more than or equal to 4 ten thousand Pa.s, the G/sin delta of the evaporation residue is more than or equal to 2.2kPa, the critical temperature is more than or equal to 88 ℃, the early strength of the asphalt mixture is further improved, and the road performance is further improved.
The preparation method of the emulsifier type cold-mix cold-laid asphalt mixture is used for preparing the emulsifier type cold-mix cold-laid asphalt mixture and comprises the following steps of:
A. stirring the coarse aggregate and the fine aggregate to obtain a first mixed aggregate;
B. adding the modified emulsified asphalt and mineral filler into the first mixed aggregate, and stirring to obtain a second mixed aggregate;
C. adding the water-reactive resin demulsifier into the second mixed aggregate, and stirring to obtain an emulsifier type cold-mix cold-laid asphalt mixture;
D. compacting the prepared emulsifier type cold-mixed and cold-paved asphalt mixture at normal temperature, and curing for 11-13 h at 110 ℃.
The technical scheme also provides a preparation method of the emulsifier type cold-mix cold-laid asphalt mixture, which has simple steps and strong operability, is beneficial to avoiding weakening the relevant performance of the asphalt mixture in the preparation process and is beneficial to later recycling. In addition, the prepared emulsifier type cold-mixed cold-laid asphalt mixture is compacted at normal temperature, and maintained at 110 ℃ for 11-13 hours, wherein the water loss rate is more than 98%, so that the road performance can be met, and the asphalt pavement can be opened as soon as possible; in the technical scheme, the asphalt pavement paved by the asphalt mixture is maintained for 24 hours at the temperature of 110 ℃ for more than 99 percent, and the asphalt pavement paved by the traditional emulsifier type cold-mix and cold-mix asphalt mixture is maintained for 24 hours at the temperature of 110 ℃ for 87-93 percent, so that the early water loss rate and the water loss rate of the asphalt pavement paved by the asphalt mixture are higher than those of the asphalt pavement paved by the traditional emulsifier type cold-mix and cold-mix asphalt mixture, the water loss rate in the asphalt mixture is closely related to the strength of the asphalt mixture, the higher the water loss rate is, the higher the strength is, and the early strength speed of the asphalt mixture formed by the asphalt mixture obtained by the technical scheme are higher than those of the traditional asphalt mixture, and the early strength forming speed of the asphalt mixture is accelerated on the premise of ensuring the road performance.
Preferably, in steps A, B and C, the stirring should be performed uniformly, further ensuring the relevant properties of the asphalt mix.
Preferably, in the step C, the water-reactive resin demulsifier is added into the second mixed aggregate at the same speed for stirring, so that the water-reactive resin demulsifier and the second mixed aggregate are stirred more uniformly, the water-reactive resin demulsifier reacts with the modified emulsified asphalt more uniformly, the coating property and the adhesion of the modified emulsified asphalt to the second mixed aggregate are enhanced, the early strength of the asphalt mixture is improved, and the road performance of the asphalt mixture is improved.
Preferably, in the step D, the prepared emulsifier type cold-mix cold-laid asphalt mixture is compacted at normal temperature and maintained for 12 hours at the temperature of 110 ℃, so that the opening time of the inside of asphalt is shortened while the performance of the emulsifier type cold-mix cold-laid asphalt mixture is ensured.
Further, the stirring time in the step A is 20-40 s; the stirring time of the step B is 50-70 s, the stirring time of the step C is 20-60 s, and the total stirring time of the steps A, B and C is more than or equal to 108s.
In a preferred embodiment of the present technical solution, the stirring time in the step B is 20-40 s, so that the coarse aggregate and the fine aggregate are more uniformly distributed, and meanwhile, excessive abrasion of the coarse aggregate in the stirring process caused by too long stirring is avoided, and the edges, corners and integrity are damaged, so that the adhesion with asphalt is weakened, the early strength is affected, and the road performance is affected.
In another preferred embodiment of the present technical solution, the stirring time of step C is 50-70 s, the stirring time of step D is 20-60 s, and the total stirring time of steps B, C and D is equal to or greater than 108s, which is beneficial to ensuring the relevant performance of the asphalt mixture.
The technical scheme of the invention is further described by the following specific embodiments.
Example 1
Preparing a water-reactive resin demulsifier: the molecular weight of the water-reactive resin demulsifier is 100 ten thousand, the crosslinking degree is 0.05%, and the water absorption rate is 30;
preparing asphalt mixture raw materials in parts by mass: 400 parts of diabase broken stone, 600 parts of limestone machine-made sand, 160 parts of star-shaped SBS modified asphalt, 10 parts of mineral powder and 2 parts of water reaction type resin demulsifier, wherein the solid content of the star-shaped SBS modified asphalt is 62%, the addition amount of a modifier is 8%, the 25 ℃ elasticity of the star-shaped SBS modified asphalt is recovered to 95%, and the 60 ℃ composite shear modulus G is obtained ＊ 10KPa,60 ℃ dynamic viscosity of 4 ten thousand Pa.s, G of evaporated residue ＊ The/sin delta was 2.2kPa and the critical temperature was 88 ℃.
Stirring the coarse aggregate and the fine aggregate for 20s to obtain a first mixed aggregate;
adding the modified emulsified asphalt and mineral filler into the first mixed aggregate, and stirring for 50s to obtain a second mixed aggregate;
Adding the water-reactive resin demulsifier into the second mixed aggregate, and stirring for 60s to obtain an emulsifier type cold-mix cold-laid asphalt mixture;
the prepared emulsifier type cold-mix cold-laid asphalt mixture is compacted at normal temperature and maintained at 110 ℃ for 11 hours.
Example 2
Preparing a water-reactive resin demulsifier raw material: the mass mixing ratio of acrylic acid to sodium hydroxide is 1.5:1, the mass mixing ratio of sodium persulfate to acrylic acid is 1:1000, and the mass mixing ratio of divinylbenzene to acrylic acid is 3:4000; the molecular weight of the water-reactive resin demulsifier is 500 ten thousand, the crosslinking degree is 0.5%, and the water absorption rate is 50;
preparing asphalt mixture raw materials in parts by mass: 500 parts of diabase broken stone, 500 parts of limestone machine-made sand, 125 parts of linear SBS modified asphalt, 20 parts of mineral powder and 5 parts of water reaction type resin demulsifier, wherein the solid content of the linear SBS modified asphalt is 63.5%, the addition amount of the modifier is 10%, the elastic recovery of the linear SBS modified asphalt at 25 ℃ is 95%, and the composite shear modulus G at 60℃ is realized ＊ 10KPa,60 ℃ dynamic viscosity of 4 ten thousand Pa.s, G of evaporated residue ＊ The/sin delta was 2.2kPa and the critical temperature was 88 ℃.
Hydrophilic propylene organic compound, sodium hydroxide, water, initiator and cross-linking agent are reacted for 1h to obtain a water-reactive resin demulsifier;
Stirring the coarse aggregate and the fine aggregate for 30s to obtain a first mixed aggregate;
adding the modified emulsified asphalt and mineral filler into the first mixed aggregate, and stirring for 60s to obtain a second mixed aggregate;
adding the water-reactive resin demulsifier into the second mixed aggregate, and stirring for 20s to obtain an emulsifier type cold-mix cold-laid asphalt mixture;
the prepared emulsifier type cold-mix cold-laid asphalt mixture is compacted at normal temperature and maintained at 110 ℃ for 12 hours.
Example 3
Preparing a water-reactive resin demulsifier raw material: the mass mixing ratio of the acrylamide to the sodium hydroxide is 2:1, the mass mixing ratio of the sodium persulfate to the acrylamide is 3:2000, and the mass mixing ratio of the divinylbenzene to the acrylamide is 5:4000; the molecular weight of the water-reactive resin demulsifier is 1000 ten thousand, the crosslinking degree is 1.00%, and the water absorption rate is 100;
preparing asphalt mixture raw materials in parts by mass: 600 parts of diabase broken stone, 400 parts of limestone machine-made sand, 90 parts of star SBS modified asphalt, 30 parts of mineral powder and 8 parts of water reaction type resin demulsifier, wherein the solid content of the star SBS modified asphalt is 65.5%, the addition amount of the modifier is 10%, and the elasticity of the star SBS modified asphalt at 25 ℃ is recovered to 95% Composite shear modulus G at 60 DEG C ＊ 10KPa,60 ℃ dynamic viscosity of 4 ten thousand Pa.s, G of evaporated residue ＊ The/sin delta was 2.2kPa and the critical temperature was 88 ℃.
Hydrophilic propylene organic compound, sodium hydroxide, water, initiator and cross-linking agent are reacted for 2 hours to obtain a water-reactive resin demulsifier;
stirring the coarse aggregate and the fine aggregate for 40s to obtain a first mixed aggregate;
adding the modified emulsified asphalt and mineral filler into the first mixed aggregate, and stirring for 70s to obtain a second mixed aggregate;
adding the water-reactive resin demulsifier into the second mixed aggregate, and stirring for 40s to obtain an emulsifier type cold-mix cold-laid asphalt mixture;
the prepared emulsifier type cold-mix cold-laid asphalt mixture is compacted at normal temperature and maintained at 110 ℃ for 13h.
Comparative example 1
Preparing an emulsified asphalt mixture I according to a conventional asphalt mixture method; wherein, according to the mass portion, the emulsified asphalt mixture I comprises 545 portions of diabase broken stone, 455 portions of limestone machine-made sand, 106 portions of star SBS modified asphalt and 16 portions of mineral powder; the prepared emulsified asphalt mixture I is compacted at normal temperature and maintained at 110 ℃ for 12 hours.
Comparative example 2
Preparing an emulsified asphalt mixture II according to a conventional asphalt mixture method; wherein, according to the mass portion, the asphalt comprises 540 portions of diabase crushed stone, 460 portions of limestone machine-made sand, 109 portions of star SBS modified asphalt, 16 portions of mineral powder and 15 portions of ordinary Portland cement No. 42.5; the prepared emulsified asphalt mixture I is compacted at normal temperature and maintained at 110 ℃ for 12 hours.
Asphalt mixtures of examples 1 to 3, comparative example 1 and comparative example 2 were subjected to asphalt pavement paving with paving thicknesses shown in table 1 below, and the asphalt pavement after paving was subjected to relevant performance tests according to the standards specified in the test procedure for asphalt and asphalt mixtures for highway engineering (JTG E20-2011), and the results are shown in table 1 below.
Table 1 results of testing relevant properties of asphalt pavement
As can be seen from the performance test results of Table 1, the asphalt pavement paved by the emulsion type cold-mix asphalt mixture of the technical scheme has higher water loss rate after curing for 12h and 24h at 110 ℃ than the asphalt pavement paved by the traditional cement-free emulsified asphalt mixture I and the asphalt pavement paved by the cement-containing emulsified asphalt mixture II, and the asphalt pavement paved by the asphalt mixture of the technical scheme has higher water loss rate after curing for 12h at 110 ℃ than the asphalt pavement paved by the traditional cement-free emulsified asphalt mixture I, and the water loss rate is closely related to the strength of the asphalt pavement, and the higher the strength is, so that the early strength and the early strength speed formed by the asphalt mixture obtained by the technical scheme are higher than those of the traditional cement-free emulsified asphalt mixture I and the cement-containing emulsified asphalt mixture II.
In addition, as can be seen from table 1, the asphalt pavement freeze-thawing splitting strength ratio obtained by the technical scheme is higher than that of the asphalt pavement paved by the traditional cement-free emulsified asphalt mixture I and the asphalt pavement paved by the cement-containing emulsified asphalt mixture II, and the higher the freeze-thawing splitting strength ratio is, the stronger the cracking resistance is, so that the asphalt mixture obtained by the technical scheme is stronger than that of the traditional cement-free emulsified asphalt mixture I and the cement-containing emulsified asphalt mixture II.
Meanwhile, as can be seen from table 1, the asphalt pavement obtained by the technical scheme has various performance test indexes except the water loss rate and the freeze thawing splitting strength ratio which are superior to those of the asphalt pavement paved by the traditional cement-free emulsified asphalt mixture I, breaks through the use limitation of the traditional cement-free emulsified asphalt mixture I, accelerates the early strength formation speed of the asphalt mixture on the premise of not using cement and ensuring the pavement performance, and solves the technical problem of difficult pavement recovery paved by the asphalt mixture, so as to overcome the defects in the prior art.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (10)
1. An emulsifier type cold mix and cold spread asphalt mixture, which is characterized in that: according to the mass portion, the modified emulsified asphalt comprises 400 to 600 portions of coarse aggregate, 400 to 600 portions of fine aggregate, 90 to 160 portions of modified emulsified asphalt, 10 to 30 portions of mineral filler and 2 to 8 portions of water reaction type resin demulsifier; wherein the molecular weight of the water-reactive resin demulsifier is 100-1000 ten thousand.
2. An emulsifier type cold mix asphalt mix as defined in claim 1, wherein: the crosslinking degree of the water-reactive resin demulsifier is 0.05-1.0%;
the molecular weight of the water-reactive resin demulsifier is 200-700 ten thousand.
3. An emulsifier type cold mix asphalt mix as defined in claim 1, wherein: the water absorption rate of the water-reactive resin demulsifier is 30-100.
4. An emulsifier type cold mix asphalt mix as defined in claim 1, wherein: the water-reactive resin demulsifier comprises a hydrophilic propylene organic compound, sodium hydroxide, water, an initiator and a cross-linking agent.
5. An emulsifier type cold mix asphalt mix as defined in claim 4, wherein: the mass mixing ratio of the hydrophilic propylene organic compound to the sodium hydroxide is (1.5-2): 1, a step of;
the mass mixing ratio of the initiator to the hydrophilic propylene organic compound is (2-3): 2000;
the mass mixing ratio of the cross-linking agent to the hydrophilic propylene organic compound is (3-5): 4000.
6. an emulsifier type cold mix asphalt mix as defined in claim 4, wherein: the hydrophilic propylene organic compound comprises any one or the combination of two of acrylic acid and acrylamide;
the initiator comprises any one or the combination of two of sodium persulfate and ammonium persulfate;
the cross-linking agent is divinylbenzene.
7. An emulsifier type cold mix asphalt mix as defined in claim 1, wherein:
According to the mass percentage, the solid content of the modified emulsified asphalt is 62-65%;
the modified emulsified asphalt comprises an SBS modifier, and the addition amount of the SBS modifier is more than or equal to 8% according to the mass percentage;
the modified emulsified asphalt comprises any one of star-type SBS modified asphalt or linear SBS modified asphalt.
8. An emulsifier type cold mix asphalt mix as defined in claim 1, wherein: the elastic recovery of the modified emulsified asphalt at 25 ℃ is more than or equal to 95%, and the composite shear modulus G at 60 DEG C ＊ More than or equal to 10KPa,60 ℃ dynamic viscosity more than or equal to 4 ten thousand Pa.s, G of evaporation residue ＊ The sin delta is more than or equal to 2.2kPa, and the critical temperature is more than or equal to 88 ℃.
9. A preparation method of an emulsifier type cold-mix cold-laid asphalt mixture is characterized by comprising the following steps: an emulsion type cold mix asphalt mixture for use in the preparation of any one of claims 1 to 8, comprising the steps of:
A. stirring the coarse aggregate and the fine aggregate to obtain a first mixed aggregate;
B. adding the modified emulsified asphalt and mineral filler into the first mixed aggregate, and stirring to obtain a second mixed aggregate;
C. adding the water-reactive resin demulsifier into the second mixed aggregate, and stirring to obtain an emulsifier type cold-mix cold-laid asphalt mixture;
D. Compacting the prepared emulsifier type cold-mixed and cold-paved asphalt mixture at normal temperature, and curing for 11-13 h at 110 ℃.
10. The method for preparing the emulsifier type cold mix and cold spread asphalt mixture according to claim 9, wherein the method comprises the following steps: the stirring time in the step A is 20-40 s; the stirring time of the step B is 50-70 s, the stirring time of the step C is 20-60 s, and the total stirring time of the steps A, B and C is more than or equal to 108s.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310277016.6A CN116425457A (en) | 2023-03-21 | 2023-03-21 | Early-strength emulsified asphalt cold-mixing mixture and preparation method thereof |
| CN2023102770166 | 2023-03-21 |
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| CN117700155A (en) * | 2023-12-28 | 2024-03-15 | 华南理工大学 | Water-reactive asphalt cold-patch material, and preparation method and use method thereof |
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| CN116768534B (en) * | 2023-08-16 | 2024-01-02 | 华运通达科技集团有限公司 | Cold mix asphalt mixture with high fatigue resistance and preparation method thereof |
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| CN117700155A (en) * | 2023-12-28 | 2024-03-15 | 华南理工大学 | Water-reactive asphalt cold-patch material, and preparation method and use method thereof |
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