CN112897937B - Composite modified cold-patch asphalt mixture and preparation method thereof - Google Patents
Composite modified cold-patch asphalt mixture and preparation method thereof Download PDFInfo
- Publication number
- CN112897937B CN112897937B CN202110138446.0A CN202110138446A CN112897937B CN 112897937 B CN112897937 B CN 112897937B CN 202110138446 A CN202110138446 A CN 202110138446A CN 112897937 B CN112897937 B CN 112897937B
- Authority
- CN
- China
- Prior art keywords
- cold
- asphalt
- patch
- composite modified
- rubber powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000010426 asphalt Substances 0.000 title claims abstract description 125
- 239000000203 mixture Substances 0.000 title claims abstract description 53
- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 61
- 229920001971 elastomer Polymers 0.000 claims abstract description 60
- 239000005060 rubber Substances 0.000 claims abstract description 60
- 238000010008 shearing Methods 0.000 claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 40
- 230000008961 swelling Effects 0.000 claims abstract description 32
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 30
- 239000011707 mineral Substances 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 239000004814 polyurethane Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 239000003085 diluting agent Substances 0.000 claims abstract description 12
- 239000010920 waste tyre Substances 0.000 claims abstract description 12
- 229920002635 polyurethane Polymers 0.000 claims abstract description 9
- 235000019738 Limestone Nutrition 0.000 claims abstract description 6
- 239000006028 limestone Substances 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 238000001723 curing Methods 0.000 claims description 13
- 239000011159 matrix material Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 239000003350 kerosene Substances 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 claims description 3
- 239000003502 gasoline Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000007865 diluting Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000003607 modifier Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 238000013112 stability test Methods 0.000 description 3
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000051 modifying effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229930195734 saturated hydrocarbon Natural products 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000011115 styrene butadiene Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 235000019737 Animal fat Nutrition 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000013008 moisture curing Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 235000019871 vegetable fat Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- 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
Abstract
The invention discloses a composite modified cold-patch asphalt mixture and a preparation method thereof, wherein the composite modified cold-patch asphalt mixture is prepared by adopting a cold-patch asphalt raw material and an ore material according to a mixing ratio of 1:19, wherein the cold-patch asphalt comprises the following components: 70-75% of asphalt, 3.5-7% of polyurethane, 1-3% of waste tire rubber powder, 3-9% of a swelling agent and 15-20% of a diluent; the mineral aggregate material comprises: diabase, limestone and basalt mineral fines. Pre-swelling rubber powder and pre-treating the rubber powder; shearing and curing to obtain the composite modified asphalt; and diluting to obtain cold patch asphalt, and mixing with mineral aggregate to obtain a cold patch asphalt mixture. The cold-patch asphalt mixture has high initial and forming strength and water resistance, and also has certain high-temperature stability, short forming time and balanced high and low temperature performance. The cold-patch material has strong environmental adaptability and can meet all-weather construction requirements. The forming time is short, the forming strength is high, and the requirement of rapidly opening traffic after pit slot repairing can be met.
Description
Technical Field
The invention relates to the technical field of road pit repairing, in particular to a composite modified cold-patch asphalt mixture and a preparation method thereof.
Background
The pits are one of common road surface diseases, and if the pits are not treated in time, a domino effect often occurs, so that large-area damage to the road surface of a corresponding road section is caused, and the driving safety and the stability of the whole structure of the road surface are seriously influenced. Therefore, the pit repairing technology is widely regarded by the industry as the most common daily maintenance work of the maintenance department, both abroad and domestically. The traditional pit slot repairing method mainly adopts a hot-mix asphalt repairing mode, has the advantages of mature preparation process, excellent material performance and the like, but the hot-mix material has strict limitation on environmental conditions such as weather, seasons and the like, and can not be constructed even under rainy and low-temperature conditions, so that the hot-mix material pit slot repairing technology cannot meet all-weather construction requirements. In addition, the positions of the pits in the road surface are mostly dispersed and the area is small, so that the construction cost of repairing by using the hot-mixed material is increased, and the economic benefit is poor. In conclusion, pavement pits are often difficult to repair in time, and further other pavement diseases are induced, so that the service life of the pavement is seriously influenced.
The cold patch asphalt mixture is an asphalt mixture which is preheated, mixed and stored and can be used at normal temperature. The cold-patch asphalt mixture is low in construction cost, does not need large-scale corollary equipment, can be used in cold regions and rainy seasons, is not limited by construction environment, and solves the problems that the traditional hot patch material is not timely in repair and wastes repair excess materials due to high requirement on the construction environment. However, the cold patching material has some problems, the most prominent of which is that the material performance is worse than that of the hot patching material, and the method of adding a modifier into the patching material is mainly adopted to develop a high-performance modified asphalt mixture specially used for repairing a pit slot, so that the high-performance modified asphalt mixture has stronger water stability, low temperature resistance and good caking property.
The invention discloses an environment-friendly solvent, a cold patching material and a preparation method thereof in the patent CN107805300A (application publication date 2018, 3, 16), wherein the solvent is obtained by catalytic reaction of animal fat or vegetable fat and polyol through a catalyst, and an efficient shearing mode is used for preparing an asphalt cold patching liquid.
The patent CN103193417A (application publication date 2013, 7, 10) discloses a urea-formaldehyde-based asphalt pavement quick cold-patch material, which takes urea-formaldehyde resin as a matrix, synthesizes modified asphalt by adding additives such as a formaldehyde absorbent, a composite modifier and a curing agent, and prepares a pavement cold-patch material based on the modified asphalt.
CN110317003A (application publication date 2019, 10, 11) patent discloses a saturated hydrocarbon and styrene-butadiene liquid rubber composite modified asphalt cold-patch and a preparation method thereof, wherein the material is prepared by carrying out composite modification on 70# petroleum asphalt through saturated hydrocarbon and styrene-butadiene liquid rubber, and adding a surfactant to further catalyze the performance of a modifier, and the material can have good cohesiveness with asphalt concrete, cement concrete, metal and wood pavement.
CN106751976A (application publication date 2017, 5, 31) patent discloses a road cold-patch material and a preparation method thereof, wherein a modifier selected by the cold-patch material is acrylate. The road cold-patch material is used for repairing a pit under a low-temperature environment.
The invention mainly aims at improving the low-temperature performance, the strength and the water resistance of the cold-patch asphalt mixture to a certain extent, but neglects the fact that the cold-patch asphalt mixture should have higher initial strength, shorter forming time and certain high-temperature stability, so that the problem of secondary damage of repaired pits still exists in the actual engineering, the service life of the cold-patch material is seriously influenced, and the popularization and the application of the cold-patch material in the actual engineering are hindered.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a composite modified cold-patch asphalt mixture and a preparation method thereof. The cold-patch material has strong environmental adaptability and can meet all-weather construction requirements. The forming time is short, the forming strength is high, and the requirement of rapidly opening traffic after pit slot repairing can be met.
The invention is realized by the following technical scheme.
The invention provides a composite modified cold-patch asphalt mixture, which comprises the following cold-patch asphalt raw materials and mineral aggregate materials in a mixing ratio of 1:19 by mass:
wherein the cold patch asphalt comprises: 70-75% of asphalt, 3.5-7% of polyurethane, 1-3% of waste tire rubber powder, 3-9% of a swelling agent and 15-20% of a diluent;
the mineral aggregate material comprises: diabase, limestone and basalt mineral fines.
With respect to the above technical solutions, the present invention has a further preferable solution:
preferably, the bitumen is a base bitumen.
Preferably, the swelling agent is diesel or kerosene.
Preferably, the diluent is one or more of kerosene, diesel oil and gasoline.
Preferably, the mineral aggregate material comprises diabase with the particle size of 9.5-13.2 mm, limestone with the particle size of 0.075-4.75 mm and basalt mineral powder with the particle size of less than 0.075 mm.
Preferably, the diabase accounts for 5.6-17.6% of the mineral aggregate material; limestone accounts for 1.4-30.2% of the mineral aggregate material; the basalt mineral powder accounts for 4 percent of the mineral aggregate material.
The invention further provides a preparation method of the composite modified cold-patch asphalt mixture, which comprises the following steps:
A. pre-swelling 1-3% of waste tire rubber powder and 3-9% of swelling agent in a mass ratio of 1: 3-1: 4 to obtain pre-swelling rubber powder;
B. heating the pre-swelling rubber powder obtained in the step A, and stirring at a shearing speed to obtain pre-treated rubber powder;
C. adding the pretreated rubber powder obtained in the step B into 70-75% of matrix asphalt at 120-130 ℃, raising the temperature to 170-185 ℃, and shearing;
D. stopping heating, maintaining the temperature between 130 and 135 ℃, adding 3.5 to 7 percent of polyurethane, shearing at a shearing rate, and curing in an oven to obtain the composite modified asphalt;
E. after the cured composite modified asphalt is cooled to below 65 ℃, adding 15-20% of diluent into the composite modified asphalt, and uniformly stirring to obtain cold patch asphalt;
F. and D, mixing the cold patch asphalt prepared in the step D with mineral aggregate in a mass ratio of 1:19 for 120-240 seconds to obtain a cold patch asphalt mixture.
Preferably, in the step A, the pre-swelling is carried out for 3-5 h at the temperature of 60-80 ℃;
in the step B, the pre-swelling rubber powder is heated to 220-260 ℃, and is stirred for 0.3-0.5 h at a shearing speed of 300-500 rpm.
Preferably, in the step C, the temperature is raised to 170-185 ℃ within 3-5 min, and the shearing is carried out for 0.5-1 h at the shearing rate of 4000-5000 rpm.
Preferably, in the step D, shearing is carried out for 0.3-0.5 h at the shearing rate of 2000-3000 rpm, and finally the material is placed into an oven with the temperature of 80-100 ℃ for curing for 2-3 h.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the invention fully utilizes the good high-temperature performance of waste tire rubber powder and the excellent low-temperature performance and strength of polyurethane, adds the waste tire rubber powder and the polyurethane into No. 70 matrix asphalt through a high-speed shearing instrument, and performs composite modification on the mixture to prepare the composite modified asphalt. And then adding the diluent into the composite modified asphalt to prepare the parent cold patch asphalt. And then mineral aggregate grading is preferably selected by taking the mixing amount of the mineral powder as a control index, and finally the cold patch asphalt and the mineral aggregate are fully mixed to prepare the cold patch asphalt mixture with excellent performance.
Because the selected polyurethane is a moisture-curing material and can be cured within 0.5-1 h when contacting with air at normal temperature, the cold patch asphalt added with the polyurethane has shorter curing time than the cold patch asphalt without the polyurethane, and can meet the requirement of rapidly opening traffic. The waste tire rubber powder has the advantages of huge yield, low price, low carbon and environmental protection in China, excellent high-temperature performance and good viscosity when being applied to modified asphalt, water resistance, noise reduction and the like. The two kinds of composite modified asphalt simultaneously take two advantages into consideration, make up the problem of unbalanced high and low temperature performance caused by single modification, and improve the road performance of the cold patch asphalt mixture.
When the rubber powder contacts with the asphalt, the rubber powder absorbs light components in the asphalt to enable the rubber powder and the asphalt to be melted, and when the rubber powder is mixed in an excessive amount, part of the rubber powder cannot be melted with the asphalt and is dispersed in the asphalt in an obvious rubber particle mode. The modulus of the two materials is different, and the two materials generate larger strain in the stretching direction when being tensioned at low temperature, so that stress concentration occurs at the contact interface of the two materials, the bonding force between the asphalt is weakened, and the macroscopic performance of the asphalt, namely ductility reduction is reflected. According to the invention, the rubber powder is pretreated, so that the mixing amount of the rubber powder in the asphalt is increased, and the problem that part of the rubber powder cannot be melted with the asphalt due to excessive mixing amount is avoided, thereby better playing the modifying effect.
The initial strength of the prepared composite modified cold-patch asphalt mixture is not less than 5KN, the forming strength is not less than 9KN, the dynamic stability at 40 ℃ is not less than 2600 times/mm, the dynamic stability at 60 ℃ is not less than 1400 times/mm, the breaking tensile strain is not less than 2100 mu epsilon, the soaking residual stability is not less than 70%, the mass loss rate is not more than 12%, and the time for reaching the theoretical forming strength is not more than 5 d.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
FIG. 1 is a cross-sectional view of a rubber crumb modified asphalt ductility die without pre-swelling;
FIG. 2 is a cross-sectional view of a pre-swollen rubber powder modified asphalt ductility die.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
The preparation method of the composite modified cold-patch asphalt mixture comprises the following steps:
A. firstly, pre-swelling 1-3% of waste tire rubber powder and 3-9% of swelling agent at a ratio of 1:3 at 60-80 ℃ for 3-5 h to obtain pre-swollen rubber powder;
B. heating the pre-swelling rubber powder obtained in the step A to 220-260 ℃, and stirring at a shearing speed of 300-500 rpm for 0.3-0.5 h to obtain pre-treated rubber powder;
C. adding the pretreated rubber powder obtained in the step B into 70-75% of No. 70 matrix asphalt at 120-130 ℃, raising the temperature to 170-185 ℃ within 3-5 min, and shearing for 0.5-1 h at a shearing rate of 4000-5000 rpm by using a high-speed shearing instrument;
D. stopping heating, maintaining the temperature between 130 and 135 ℃, adding 3.5 to 7 percent of Polyurethane (PU), shearing at a shearing rate of 2000 to 3000rpm for 0.3 to 0.5h, and finally putting the mixture into an oven at 80 to 100 ℃ for curing for 2 to 3h to obtain the composite modified asphalt, wherein the diagram in figure 2 shows;
E. after the cured composite modified asphalt is cooled to below 65 ℃, adding 14-20% of diluent into the composite modified asphalt, and uniformly stirring to obtain cold patch asphalt;
F. and D, mixing the cold patch asphalt prepared in the step D and the mineral aggregate in the table 1 for 120-240 seconds in a mass ratio of 1:19 to obtain a cold patch asphalt mixture.
A specific example is given below to further illustrate the preparation process of the present invention, wherein the shear temperature, shear rate, curing time and curing temperature are unchanged for each example.
Example 1
A. Firstly, pre-swelling 2% of waste tire rubber powder and 6% of swelling agent at a ratio of 1:3 at 80 ℃ for 4 hours to obtain pre-swollen rubber powder;
B. heating the pre-swelling rubber powder obtained in the step A to 260 ℃, and stirring at a shearing speed of 300rpm for 0.4h to obtain pre-treated rubber powder;
C. adding the pretreated rubber powder obtained in the step B into 70% 70# matrix asphalt at 120 ℃, raising the temperature to 170-185 ℃ within 3-5 min, and shearing for 0.5-1 h at the shearing rate of 4000-5000 rpm by using a high-speed shearing instrument;
D. stopping heating, maintaining the temperature between 130 and 135 ℃, adding 7 percent of Polyurethane (PU), shearing at a shearing rate of 2000 to 3000rpm for 0.3 to 0.5h, and finally putting the mixture into an oven at 80 to 100 ℃ for curing for 2 to 3h to obtain the composite modified asphalt;
E. after the cured composite modified asphalt is cooled to below 65 ℃, 15% of diluent is added into the composite modified asphalt, and the cold patch asphalt is prepared after uniform stirring;
F. and D, mixing the cold patch asphalt prepared in the step D and the mineral aggregate in the table 1 for 120-240 seconds in a mass ratio of 1:19 to obtain a cold patch asphalt mixture.
Example 2
A. Firstly, pre-swelling 3% of waste tire rubber powder and 9% of swelling agent at a ratio of 1:3 at 70 ℃ for 5 hours to obtain pre-swollen rubber powder;
B. heating the pre-swelling rubber powder obtained in the step A to 240 ℃, and stirring at a shearing speed of 500rpm for 0.5h to obtain pre-treated rubber powder;
C. adding the pretreated rubber powder obtained in the step B into 70% 70# matrix asphalt at 125 ℃, raising the temperature to 170-185 ℃ within 3-5 min, and shearing for 0.5-1 h at the shearing rate of 4000-5000 rpm by using a high-speed shearing instrument;
D. stopping heating, maintaining the temperature between 130 and 135 ℃, adding 4 percent of Polyurethane (PU), shearing at a shearing rate of 2000 to 3000rpm for 0.3 to 0.5h, and finally putting the mixture into an oven at 80 to 100 ℃ for curing for 2 to 3h to obtain the composite modified asphalt;
E. after the cured composite modified asphalt is cooled to below 65 ℃, adding 14% of diluent into the composite modified asphalt, and uniformly stirring to obtain cold patch asphalt;
F. and D, mixing the cold patch asphalt prepared in the step D and the mineral aggregate in the table 1 for 120-240 seconds in a mass ratio of 1:19 to obtain a cold patch asphalt mixture.
Example 3
A. Firstly, pre-swelling 1% of waste tire rubber powder and 4% of swelling agent at a ratio of 1:3 at 80 ℃ for 3 hours to obtain pre-swollen rubber powder;
B. heating the pre-swelling rubber powder obtained in the step A to 220 ℃, and stirring at a shearing speed of 400rpm for 0.3h to obtain pre-treated rubber powder;
C. adding the pretreated rubber powder obtained in the step B into 75% 70# matrix asphalt at the temperature of 130 ℃, raising the temperature to 170-185 ℃ within 3-5 min, and shearing for 0.5-1 h at the shearing rate of 4000-5000 rpm by using a high-speed shearing instrument;
D. stopping heating, maintaining the temperature between 130 and 135 ℃, adding 3.5 percent of Polyurethane (PU), shearing at a shearing rate of 2000 to 3000rpm for 0.3 to 0.5h, and finally putting the mixture into an oven at 80 to 100 ℃ for curing for 2 to 3h to obtain the composite modified asphalt;
E. after the cured composite modified asphalt is cooled to below 65 ℃, adding 16.5% of diluent into the composite modified asphalt, and uniformly stirring to obtain cold patch asphalt;
F. and D, mixing the cold patch asphalt prepared in the step D and the mineral aggregate in the table 1 for 120-240 seconds in a mass ratio of 1:19 to obtain a cold patch asphalt mixture.
Example 4
A. Firstly, pre-swelling 1% of waste tire rubber powder and 3% of swelling agent at a ratio of 1:3 at 70 ℃ for 3.5 hours to obtain pre-swollen rubber powder;
B. heating the pre-swelling rubber powder obtained in the step A to 250 ℃, and stirring at a shearing speed of 350rpm for 0.5h to obtain pre-treated rubber powder;
C. adding the pretreated rubber powder obtained in the step B into 72.5% 70# matrix asphalt at 125 ℃, raising the temperature to 170-185 ℃ within 3-5 min, and shearing for 0.5-1 h at the shearing rate of 4000-5000 rpm by using a high-speed shearing instrument;
D. stopping heating, maintaining the temperature between 130 and 135 ℃, adding 3.5 percent of Polyurethane (PU), shearing at a shearing rate of 2000 to 3000rpm for 0.3 to 0.5h, and finally putting the mixture into an oven at 80 to 100 ℃ for curing for 2 to 3h to obtain the composite modified asphalt;
E. after the cured composite modified asphalt is cooled to below 65 ℃, 20% of diluent is added into the composite modified asphalt, and the cold patch asphalt is prepared after uniform stirring;
F. and D, mixing the cold patch asphalt prepared in the step D and the mineral aggregate in the table 1 for 120-240 seconds in a mass ratio of 1:19 to obtain a cold patch asphalt mixture.
The mineral aggregate gradation is shown in table 1.
TABLE 1 Cold-patch asphalt mixture gradation
The following is a comparison of the performance of the comparative examples and the inventive examples to further illustrate the effects of the invention.
Comparative example: two commercial cold patch asphalt mixtures with high sales volume are randomly selected.
Because no clear specification exists in China about the cold patch asphalt mixture, the following common road performance is selected as an evaluation index by referring to research methods at home and abroad, and the performance test results of the embodiment and the comparative example are compared in a table 2.
TABLE 2 comparison of Properties
Note: the initial strength and the molded strength were measured by the Marshall stability test, and the strength was expressed in terms of Marshall stability.
The high-temperature performance test method is a rutting test, and the high-temperature performance is expressed by dynamic stability.
The low-temperature performance test method is a low-temperature splitting test, and the low-temperature performance is represented by breaking tensile strain.
The water stability test method is a water immersion Marshall test, and the water stability test is characterized by the stability of water immersion residue.
The cohesiveness test method is a cohesiveness test, and the cohesiveness is characterized by a mass loss rate.
As can be seen from Table 2, the initial strength of the 4 examples is not less than 5KN, the forming strength is not less than 9KN, the dynamic stability at 40 ℃ is not less than 2600 times/mm, the dynamic stability at 60 ℃ is not less than 1400 times/mm, the tensile strain at break is not less than 2100 mu epsilon, the water immersion residual stability is not less than 70%, the mass loss rate is not more than 12%, and the time for reaching the theoretical forming strength is not more than 5 days. Compared with two commercial cold patch asphalt mixtures, the composite modified cold patch asphalt mixture prepared by the invention has excellent performance.
As can be seen from FIGS. 1 and 2, the two rubber powders have different compatibility with asphalt under the same mixing amount. The pre-treated rubber powder can improve the mixing amount of the rubber powder in the asphalt, thereby better playing the modifying effect.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (7)
1. The preparation method of the composite modified cold-patch asphalt mixture is characterized by comprising the following steps of:
A. pre-swelling 1-3% of waste tire rubber powder and 3-9% of swelling agent in a mass ratio of 1: 3-1: 4 to obtain pre-swelling rubber powder;
B. heating the pre-swelling rubber powder obtained in the step A, and stirring at a shearing speed to obtain pre-treated rubber powder;
C. adding the pretreated rubber powder obtained in the step B into 70-75% of matrix asphalt at 120-130 ℃, raising the temperature to 170-185 ℃, and shearing;
D. stopping heating, maintaining the temperature between 130 and 135 ℃, adding 3.5 to 7 percent of polyurethane, shearing at a shearing rate, and curing in an oven to obtain the composite modified asphalt;
E. after the cured composite modified asphalt is cooled to below 65 ℃, adding 15-20% of diluent into the composite modified asphalt, and uniformly stirring to obtain cold patch asphalt;
F. mixing the cold patch asphalt prepared in the step D with mineral aggregate according to the mass ratio of 1:19 to obtain a cold patch asphalt mixture;
mixing the cold-patch asphalt raw material and the mineral aggregate material according to the mixing ratio of 1:19 by mass to obtain a composite modified cold-patch asphalt mixture;
the swelling agent is diesel oil or kerosene;
the diluent is one or a mixture of more of kerosene, diesel oil and gasoline;
the mineral aggregate material comprises diabase with the grain size of 9.5-13.2 mm, limestone with the grain size of 0.075-4.75 mm and basalt mineral powder with the grain size of less than 0.075 mm;
initial strength is not less than 5KN, forming strength is not less than 9KN, dynamic stability at 40 ℃ is not less than 2600 times/mm, dynamic stability at 60 ℃ is not less than 1400 times/mm, breaking tensile strain is not less than 2100 mu epsilon, soaking residual stability is not less than 70%, mass loss rate is not more than 12%, and time for reaching theoretical forming strength is not more than 5 d.
2. The preparation method of the composite modified cold-patch asphalt mixture according to claim 1, wherein the asphalt is matrix asphalt.
3. The preparation method of the composite modified cold-patch asphalt mixture according to claim 1, wherein diabase accounts for 5.6-17.6% of mineral aggregate material; limestone accounts for 1.4-30.2% of the mineral aggregate material; the basalt mineral powder accounts for 4 percent of the mineral aggregate material.
4. The preparation method of the composite modified cold-patch asphalt mixture according to claim 1, wherein in the step A, the pre-swelling is carried out for 3-5 hours at 60-80 ℃;
in the step B, the pre-swelling rubber powder is heated to 220-260 ℃, and is stirred for 0.3-0.5 h at a shearing speed of 300-500 rpm.
5. The preparation method of the composite modified cold-patch asphalt mixture according to claim 1, wherein in the step C, the temperature is raised to 170-185 ℃ within 3-5 min, and the shear rate is 4000-5000 rpm for 0.5-1 h.
6. The preparation method of the composite modified cold-patch asphalt mixture according to claim 1, wherein in the step D, the mixture is sheared for 0.3 to 0.5h at a shearing rate of 2000 to 3000rpm, and finally the mixture is put into an oven at 80 to 100 ℃ for curing for 2 to 3 h.
7. A composite modified cold-patch asphalt mixture prepared by the method of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110138446.0A CN112897937B (en) | 2021-02-01 | 2021-02-01 | Composite modified cold-patch asphalt mixture and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110138446.0A CN112897937B (en) | 2021-02-01 | 2021-02-01 | Composite modified cold-patch asphalt mixture and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112897937A CN112897937A (en) | 2021-06-04 |
| CN112897937B true CN112897937B (en) | 2022-04-19 |
Family
ID=76122547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110138446.0A Expired - Fee Related CN112897937B (en) | 2021-02-01 | 2021-02-01 | Composite modified cold-patch asphalt mixture and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112897937B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113248938A (en) * | 2021-06-21 | 2021-08-13 | 郑州中科新兴产业技术研究院 | Wet-cured polyurethane modified cold-mix asphalt and preparation method thereof |
| CN113526906B (en) * | 2021-07-15 | 2022-09-16 | 郑州中科新兴产业技术研究院 | Preparation method and application of latent curing cold-mixed cold-laid asphalt mixture |
| CN113698136B (en) * | 2021-07-27 | 2022-10-04 | 广东隆建工程有限公司 | Asphalt paving composition and uniform asphalt paving method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101089049A (en) * | 2006-06-13 | 2007-12-19 | 上海蜜荣科电气数字集成有限责任公司 | Waste rubber tyre powder modified asphalt and its prepn process |
| CN102181163A (en) * | 2011-05-23 | 2011-09-14 | 江阴泰富沥青有限公司 | Waste rubber powder/styrene-butadiene-styrene (SBS) composite modified asphalt and production process thereof |
| CN103044935A (en) * | 2013-01-04 | 2013-04-17 | 陈永红 | Modified cold-stirred and cold-spread room temperature bitumen and preparation method thereof |
| CN103073898A (en) * | 2012-12-26 | 2013-05-01 | 上海浦东路桥建设股份有限公司 | Environment-friendly vulcanizing material modifier for drainage asphalt roads and preparation method thereof |
| CN103145376A (en) * | 2013-03-18 | 2013-06-12 | 江苏省交通规划设计院股份有限公司 | Crumb rubber powder composited regenerated all-weather road cold-patch material and production method thereof |
| KR20180067320A (en) * | 2016-12-12 | 2018-06-20 | (재)한국건설생활환경시험연구원 | High Durability Recycled Asphalt Concrete with Phytolith Binder And Method For Manufacturing Thereof |
| CN110171942A (en) * | 2019-07-01 | 2019-08-27 | 沈阳建筑大学 | A kind of moisturecuring response type Bituminous Pavement Cold feed supplement and preparation method thereof |
| CN111500078A (en) * | 2020-05-11 | 2020-08-07 | 四川快马重工机械有限公司 | Oily cold patch asphalt and preparation process thereof |
| CN111606602A (en) * | 2019-02-26 | 2020-09-01 | 北京路德永泰环保科技有限公司 | Cold-patch rubber asphalt mixture and preparation method thereof |
-
2021
- 2021-02-01 CN CN202110138446.0A patent/CN112897937B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101089049A (en) * | 2006-06-13 | 2007-12-19 | 上海蜜荣科电气数字集成有限责任公司 | Waste rubber tyre powder modified asphalt and its prepn process |
| CN102181163A (en) * | 2011-05-23 | 2011-09-14 | 江阴泰富沥青有限公司 | Waste rubber powder/styrene-butadiene-styrene (SBS) composite modified asphalt and production process thereof |
| CN103073898A (en) * | 2012-12-26 | 2013-05-01 | 上海浦东路桥建设股份有限公司 | Environment-friendly vulcanizing material modifier for drainage asphalt roads and preparation method thereof |
| CN103044935A (en) * | 2013-01-04 | 2013-04-17 | 陈永红 | Modified cold-stirred and cold-spread room temperature bitumen and preparation method thereof |
| CN103145376A (en) * | 2013-03-18 | 2013-06-12 | 江苏省交通规划设计院股份有限公司 | Crumb rubber powder composited regenerated all-weather road cold-patch material and production method thereof |
| KR20180067320A (en) * | 2016-12-12 | 2018-06-20 | (재)한국건설생활환경시험연구원 | High Durability Recycled Asphalt Concrete with Phytolith Binder And Method For Manufacturing Thereof |
| CN111606602A (en) * | 2019-02-26 | 2020-09-01 | 北京路德永泰环保科技有限公司 | Cold-patch rubber asphalt mixture and preparation method thereof |
| CN110171942A (en) * | 2019-07-01 | 2019-08-27 | 沈阳建筑大学 | A kind of moisturecuring response type Bituminous Pavement Cold feed supplement and preparation method thereof |
| CN111500078A (en) * | 2020-05-11 | 2020-08-07 | 四川快马重工机械有限公司 | Oily cold patch asphalt and preparation process thereof |
Non-Patent Citations (1)
| Title |
|---|
| 反应型沥青冷补料制备与性能研究;盛兴跃 等;《公路交通技术》;20160229;第32卷(第1期);第48-52页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112897937A (en) | 2021-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112897937B (en) | Composite modified cold-patch asphalt mixture and preparation method thereof | |
| CN100567399C (en) | A kind of rubber powder modified asphalt and working method thereof | |
| CN101792608B (en) | Rubber asphalt and preparation method thereof | |
| WO2014129758A1 (en) | Novel highly viscoelastic warm mix modifier composition and preparation method therefor, and new and regenerated warm mix modified asphalt concrete mixture composition and preparation method therefor | |
| CN103756341A (en) | High-toughness waste rubber asphalt and preparation method thereof | |
| CN109437673B (en) | Rubber powder modified asphalt mixture and preparation method thereof | |
| CN105801006B (en) | Asphalt for heavy traffic road and preparation method thereof | |
| CN105385179B (en) | Waste sole rubber powder modified asphalt and preparation method thereof | |
| CN106431088A (en) | Preparation method of fiber and cold patch asphalt mixture | |
| CN105482474B (en) | Low-viscosity rubber powder modified asphalt and preparation method thereof | |
| CN113896458A (en) | High-performance cold-patch asphalt mixture and preparation method thereof | |
| CN112430010A (en) | Desulfurized reclaimed rubber reclaimed asphalt mixture and preparation method thereof | |
| CN109735125A (en) | A kind of novel high-strength anti-rutting modified asphalt and preparation method thereof | |
| CN102952293A (en) | Compound rubber powder modifying agent as well as preparation method and application method thereof | |
| CN102040847A (en) | Asphalt modified by desulfurated rubber powder and preparation method thereof | |
| CN103360774A (en) | Asphaltized rubber modified asphalt and preparation method thereof | |
| CN104830075A (en) | Preparation method and use of low noise asphalt pavement cementing material | |
| CN109810520A (en) | One kind having both the high glue pitch of high performance low-temperature environment-friendlyization and its production technology | |
| CN112778777A (en) | Carbon nano tube and rubber powder composite modified asphalt and preparation method thereof | |
| CN101348350A (en) | Waste rubber powder composite modified asphalt and preparation thereof | |
| CN110283616B (en) | Waste tire thermal cracking regeneration carbon black modified material and modified asphalt | |
| CN114656793A (en) | PPA (polyphthalamide) -based compounded high-toughness SBS (styrene butadiene styrene) modified asphalt regenerant and preparation method thereof | |
| CN104845391B (en) | A kind of preparation method and its usage of high durable bituminous cements | |
| CN113136109A (en) | Composite modified asphalt and preparation method thereof | |
| CN112280323A (en) | Preparation method of asphalt regenerant with large-proportion RAP mixing amount |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220419 |