CN114276051B - Anti-cracking cold-mixed asphalt for pavement restoration and preparation method thereof - Google Patents
Anti-cracking cold-mixed asphalt for pavement restoration and preparation method thereof Download PDFInfo
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- CN114276051B CN114276051B CN202111583235.4A CN202111583235A CN114276051B CN 114276051 B CN114276051 B CN 114276051B CN 202111583235 A CN202111583235 A CN 202111583235A CN 114276051 B CN114276051 B CN 114276051B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
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- 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
Abstract
The application relates to the field of road repair, and particularly discloses anti-cracking cold-mix asphalt for pavement repair and a preparation method thereof; the cold-mixed asphalt is prepared from the following raw materials in parts by weight: 3.8-4.6 parts of asphalt, 0.485-0.532 part of high-viscosity modifier, 0.09-0.12 part of composite fiber, 72-90 parts of coarse aggregate, 10.5-20 parts of fine aggregate and 1-5 parts of mineral powder; the composite fiber consists of polyester fiber and viscose fiber in a weight ratio of 1; the preparation method comprises the following steps: mixing the coarse aggregate, the fine aggregate and the mineral powder, heating to 180-220 ℃, and stirring to obtain mineral aggregate; mixing and stirring the composite fiber, the high-viscosity modifier and mineral aggregate, adding asphalt at the temperature of 145-155 ℃, and uniformly mixing and stirring to obtain a finished product; the cold-mixed asphalt has better water stability, high-temperature stability and low-temperature crack resistance.
Description
Technical Field
The application relates to the field of road repair, in particular to anti-cracking cold-mixed asphalt for pavement repair and a preparation method thereof.
Background
The urban road is generally paved by using asphalt concrete, and road diseases such as loose pavement, cracking holes, surface layer peeling and the like easily occur under the rolling action of vehicle load and the impact action of rainwater along with the passage of time, so that the service life of the road is influenced.
The asphalt concrete used for repairing the road surface is cold-mixed asphalt, namely, the cold-mixed asphalt is prepared by firstly premixing an asphalt mixture, then bagging the mixture by using nylon bags, placing the bag in a warehouse, and when the road surface is to be repaired, conveying the asphalt mixture to a site, and constructing at normal temperature to repair the road surface.
However, the pavement performance of the cold-mixed asphalt is easily affected by external conditions, and the pavement performance of the cold-mixed asphalt is poor no matter under heavy rain conditions, high temperature conditions or low temperature conditions; therefore, it is urgently needed to prepare a new cold mix asphalt which has better water stability, high temperature stability and low temperature crack resistance when being used for pavement repair.
Disclosure of Invention
In order to enable the cold-mix asphalt to have better water stability, high-temperature stability and low-temperature crack resistance, the application provides the crack-resistant cold-mix asphalt for pavement repair and the preparation method thereof.
The application provides an anti-crack cold-mix asphalt for pavement restoration, which adopts the following technical scheme:
the anti-cracking cold-mixed asphalt for pavement repair is prepared from the following raw materials in parts by weight: 3.8-4.6 parts of asphalt, 0.485-0.532 part of high-viscosity modifier, 0.09-0.12 part of composite fiber, 72-90 parts of coarse aggregate, 10.5-20 parts of fine aggregate and 1-5 parts of mineral powder; the composite fiber consists of polyester fiber and viscose fiber in a weight ratio of 1.
By adopting the technical scheme, the composite fibers, the coarse aggregates, the fine aggregates and the mineral powder are matched, the fillers with different grades are dispersed in the cold-mixed asphalt structure, the filling effect of the granular materials is matched with the better mechanical strength of the composite fibers, the compactness of the asphalt mixture structure is improved, and the cold-mixed asphalt is prevented from cracking at low temperature and high temperature, so that the water stability, the high-temperature stability and the low-temperature crack resistance of the cold-mixed asphalt are improved.
The polyester fibers and the viscose fibers are matched, the composite fibers form an interwoven network structure by utilizing the better elasticity and flexibility of the polyester fibers and the viscose fibers, and the polyester fibers and the viscose fibers are easy to deform in the compaction process of the cold-mixed asphalt mixture, so that asphalt materials can conveniently enter the pores of the network structure, and the bonding density of the composite fibers and the asphalt materials is improved; and the fine aggregate and the mineral powder are conveniently dispersed in the internal pore structure of the composite fiber, and the high-viscosity modifier is matched to facilitate the bonding between the asphalt and the composite fiber and the coarse aggregate, the fine aggregate and the mineral powder, so that the compactness of the cold-mixed asphalt structure is further improved, and the cold-mixed asphalt has better water stability, high-temperature stability and low-temperature crack resistance.
Preferably, the coarse aggregate is prepared from the following raw materials in parts by weight: 26-35 parts of basalt 1 material and 46-55 parts of basalt 2 material.
By adopting the technical scheme, the basalt particles are convenient to disperse in the cold-mixed asphalt more uniformly by utilizing higher strength, better dispersibility and flowability of the basalt particles, so that the structural density of the cold-mixed asphalt is improved; and the basalt and the composite fiber are matched, the composite fiber is pressed and deformed in the compacting process of the cold-mixed asphalt mixture, the composite fiber is convenient to carry the basalt loaded on the surface to move in a spatial position, and the structural density of the cold-mixed asphalt is further improved, so that the cold-mixed asphalt has better water stability, high-temperature stability and low-temperature crack resistance.
Preferably, the particle size of the basalt 1 material is 10-15mm, and the particle size of the basalt 2 material is 5-10mm.
By adopting the technical scheme, the particle sizes of the basalt 1 material and the basalt 2 material are limited, so that coarse aggregates can be conveniently dispersed in a cold-mixed asphalt structure to form a compact spatial structure, the compressive strength of the cold-mixed asphalt is improved, and the cold-mixed asphalt has better water stability, high-temperature stability and low-temperature crack resistance.
Preferably, the fine aggregate is composed of basalt powder and zeolite powder in a weight ratio of 1.05-0.25.
By adopting the technical scheme, the basalt powder, the zeolite powder and the viscose fiber are matched, and the multi-porous structures of the basalt powder and the zeolite powder are matched with the air permeability of the viscose fiber, so that water molecules can be conveniently migrated to the external environment in the condensation process of the asphalt mixture, the moisture content in the asphalt mixture is reduced, and the structural density of the cold-mixed asphalt is improved; and the basalt powder and the zeolite powder have good filling effect, and the structural density of the cold-mixed asphalt is further improved, so that the cold-mixed asphalt has good water stability, high-temperature stability and low-temperature crack resistance.
Preferably, the particle size of the basalt powder is 1-3mm, and the particle size of the zeolite powder is 0.1-0.5mm.
By adopting the technical scheme, the particle sizes of the basalt powder and the zeolite powder are limited, the powder can be conveniently filled into the pores of the cold-mixed asphalt structure, the density of the cold-mixed asphalt structure is improved, and the cold-mixed asphalt has better water stability, high-temperature stability and low-temperature crack resistance.
Preferably, the particle size of the mineral powder is 0.2-1mm.
By adopting the technical scheme, the particle size of the mineral powder is limited, so that the mineral powder can conveniently enter residual pores of the composite fibers, and the structural density between the composite fibers and the asphalt material is improved.
Preferably, the composite fiber is prepared by the following method:
weighing polyester fibers and viscose fibers, soaking the polyester fibers and the viscose fibers in a chitosan solution, performing ultrasonic dispersion, stirring, and taking out the soaked fibers to prepare mixed fibers;
and (2) spraying a silane coupling agent KH-570 on the surface of the mixed fiber, wherein the weight ratio of the mixed fiber to the silane coupling agent KH-570 is 1.
By adopting the technical scheme, the chitosan solution is absorbed by utilizing the good moisture absorption effect of the polyester fiber and the viscose fiber, and the chitosan is loaded on the surfaces of the polyester fiber and the viscose fiber by matching with the good bonding effect of the chitosan solution, and after the polyester fiber and the viscose fiber are mixed and stirred, chitosan substances are dispersed in a network structure formed by the polyester fiber and the viscose fiber; the peripheral surface of the mixed fiber is sprayed with a silane coupling agent KH-570, and the peripheral surface of the composite fiber has a good hydrophobic effect by utilizing the hydrophobic effect of the silane coupling agent.
When the asphalt mixture is stressed and compacted, the composite fibers deform, chitosan on the surfaces of the composite fibers and in the inner pores of the composite fibers is in contact with asphalt, amino groups in the chitosan are connected with carboxyl groups of asphalt acid in the asphalt through chemical bonding force, the composite fibers are tightly connected with the asphalt material, and the crack resistance and the compressive strength of the cold-mixed asphalt are improved by matching with the good strength and the good elastic modulus of the composite fibers, so that the cold-mixed asphalt has good water stability, high-temperature stability and low-temperature crack resistance.
The silane coupling agent, the composite fibers, the coarse aggregate, the fine aggregate and the mineral powder are matched, the coarse aggregate, the fine aggregate and the mineral powder all contain high-content silicon dioxide, under the connecting action of the silane coupling agent, the coarse aggregate, the fine aggregate and the mineral powder are conveniently attracted and connected with the composite fibers, so that the fine aggregate and the mineral powder with small particle sizes are conveniently filled in structural pores of the composite fibers and asphalt materials, the structural density of the cold-mixed asphalt is improved, and the cold-mixed asphalt has high compressive strength, crack resistance, water stability and high-temperature stability.
Preferably, the chitosan solution is a chitosan-glacial acetic acid solution with the mass fraction of 0.5-2%.
By adopting the technical scheme, the chitosan solution has good fluidity under the condition of proper viscosity, the chitosan is convenient to load on the composite fibers, and the connection between the chitosan and the asphalt material is promoted, so that the bonding effect between the composite fibers and the asphalt material is further improved, the density of the cold-mixed asphalt structure is improved, and the cold-mixed asphalt has good water stability, high-temperature stability and low-temperature crack resistance.
Preferably, the spraying speed of the silane coupling agent KH-570 is 0.5-3g/s, and the stirring speed of the mixed fiber is 50-120r/min.
By adopting the technical scheme, the spraying speed of the silane coupling agent KH-570 and the stirring speed of the mixed fibers are limited, so that the silane coupling agent KH-570 can be loaded on the outer surfaces of the composite fibers uniformly, the surface hydrophobicity of the composite fibers is ensured, the binding force among the composite fibers, asphalt materials, coarse aggregates, fine aggregates and mineral powder is improved, and the cold-mixed asphalt has high structural density, so that the cold-mixed asphalt has high water stability, high temperature stability and low temperature crack resistance.
In a second aspect, the application provides a preparation method of the anti-crack cold-mix asphalt for pavement repair, which adopts the following technical scheme:
the preparation method of the anti-crack cold-mix asphalt for pavement repair comprises the following steps:
s1, weighing coarse aggregate, fine aggregate and mineral powder, mixing, heating to 180-220 ℃, and stirring to obtain mineral aggregate;
s2, weighing the composite fibers, the high-viscosity modifier and mineral aggregate, mixing and stirring, adding asphalt at the temperature of 145-155 ℃, mixing and stirring uniformly to obtain a finished product.
By adopting the technical scheme, the coarse aggregate, the fine aggregate and the mineral powder are mixed and stirred to uniformly mix the mineral aggregate, then the mineral aggregate, the composite fiber and the high-viscosity modifier are mixed and stirred to uniformly disperse the composite fiber and the high-viscosity modifier in the mineral aggregate, and finally the heated asphalt is added, and the cold-mixed asphalt has higher structure density by utilizing the mixing and bonding of the dry material and the wet material, so that the cold-mixed asphalt has better water stability, high-temperature stability and low-temperature crack resistance.
In summary, the present application has the following beneficial effects:
1. the polyester fiber, the viscose fiber, the coarse aggregate, the fine aggregate and the mineral powder are matched, and the density of an asphalt structure is further improved by utilizing the connecting action of the fiber and the filling action of the powder, so that the water stability, the high-temperature stability and the low-temperature crack resistance of the cold-mixed asphalt are improved.
2. The chitosan solution is matched with the silane coupling agent KH-570, and the chitosan solution is insoluble in water and is matched with the silane coupling agent KH-570 to have better hydrophobicity, so that the composite fiber has better hydrophobic and waterproof effects, and the moisture in the external environment is prevented from being absorbed by the composite fiber; and the waterproof effect of the cold-mixed asphalt is improved, and the moisture in the external environment is further prevented from entering the interior of the cold-mixed asphalt structure, so that the water stability and the low-temperature crack resistance of the cold-mixed asphalt are improved.
3. The basalt 1 material, the basalt 2 material, the basalt powder, the zeolite powder and the mineral powder are matched, and the powder is conveniently filled among larger particles through continuous particle size grading, so that the structural density of the cold-mixed asphalt is improved, and the cold-mixed asphalt has better water stability and low-temperature crack resistance.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example of composite fiber
The polyester fiber in the following raw materials is purchased from Shandong Xingmeng engineering materials, inc. and has a length of 3mm, and the viscose fiber is purchased from viscose staple fiber produced by south palace eagle moon fluff, inc. and has a length of 5mm; other raw materials and equipment are all sold in the market.
Preparation example 1: the composite fiber is prepared by the following method:
weighing 1kg of polyester fiber and 0.08kg of viscose fiber, placing the polyester fiber and the viscose fiber in 5kg of chitosan solution with the mass fraction of 1%, soaking for 3min, wherein the chitosan solution is chitosan-glacial acetic acid solution, carrying out ultrasonic dispersion under the condition of 20kHz in the soaking process, stirring for 5min at the speed of 250r/min after ultrasonic dispersion, and taking out the soaked fiber to prepare mixed fiber;
0.108kg of silane coupling agent KH-570 is weighed and sprayed on the surface of the mixed fiber, the mixed fiber is continuously stirred at the rotating speed of 80r/min in the spraying process, the spraying speed of the silane coupling agent KH-570 is 1g/s, and the drying degree is 50 percent, so that the composite fiber is prepared.
Preparation example 2: the composite fiber is prepared by the following method:
weighing 1kg of polyester fiber and 0.05kg of viscose fiber, soaking in 5kg of chitosan solution with the mass fraction of 0.5% for 3min, wherein the chitosan solution is chitosan-glacial acetic acid solution, carrying out ultrasonic dispersion under the condition of 20kHz in the soaking process, stirring for 5min at the speed of 250r/min after ultrasonic dispersion, and taking out the soaked fiber to prepare mixed fiber;
0.0525kg of silane coupling agent KH-570 is weighed and sprayed on the surface of the mixed fiber, the mixed fiber is continuously stirred at the rotating speed of 50r/min in the spraying process, the spraying speed of the silane coupling agent KH-570 is 0.5g/s, and the drying degree is 50 percent, so that the composite fiber is prepared.
Preparation example 3: the composite fiber is prepared by the following method:
weighing 1kg of polyester fiber and 0.1kg of viscose fiber, placing the polyester fiber and the viscose fiber in 5kg of chitosan solution with the mass fraction of 2%, soaking for 3min, wherein the chitosan solution is chitosan-glacial acetic acid solution, carrying out ultrasonic dispersion under the condition of 20kHz in the soaking process, stirring for 5min at the speed of 250r/min after ultrasonic dispersion, and taking out the soaked fiber to prepare mixed fiber;
0.22kg of silane coupling agent KH-570 is weighed and sprayed on the surface of the mixed fiber, the mixed fiber is continuously stirred at the rotating speed of 120r/min in the spraying process, the spraying speed of the silane coupling agent KH-570 is 3g/s, and the drying degree is 50 percent, so that the composite fiber is prepared.
Examples
Asphalt in the following raw materials was purchased from Shell No. 70 petroleum asphalt; high viscosity modifier TPS, a high viscosity modifier purchased in japan; other raw materials and equipment are all sold in the market.
Example 1: an anti-cracking cold-mixed asphalt for pavement restoration:
4.3kg of asphalt, 0.518kg of high-viscosity modifier, 0.108kg of composite fiber prepared in preparation example 1, 82kg of coarse aggregate, 15kg of fine aggregate and 3kg of mineral powder; the coarse aggregate is composed of a basalt 1 material of 31kg and a basalt 2 material of 51kg, the particle size of the basalt 1 material is 10mm, and the particle size of the basalt 2 material is 5mm; the fine aggregate consists of 12.5kg of basalt powder and 2.5kg of zeolite powder; the particle size of the basalt powder is 2mm, and the particle size of the zeolite powder is 0.2mm; the particle size of the mineral powder is 0.5mm; the high-viscosity modifier is a high-viscosity modifier TPS;
the preparation method comprises the following steps:
s1, weighing coarse aggregate, fine aggregate and mineral powder, mixing, heating to 200 ℃, and stirring for 30S to prepare mineral aggregate;
s2, weighing the composite fibers, the high-viscosity modifier and the mineral aggregate, mixing and stirring for 20S, adding asphalt at the temperature of 150 ℃, mixing and stirring for 1.5min, and obtaining a finished product.
Example 2: the present embodiment is different from embodiment 1 in that:
3.8kg of asphalt, 0.485kg of high-viscosity modifier, 0.09kg of composite fiber prepared in preparation example 2, 72kg of coarse aggregate, 10.5kg of fine aggregate and 1kg of mineral powder; the coarse aggregate is composed of 26kg of basalt 1 material and 46kg of basalt 2 material, the particle size of the basalt 1 material is 12mm, and the particle size of the basalt 2 material is 8mm; the fine aggregate is composed of 10kg of basalt powder and 0.5kg of zeolite powder; the particle size of the basalt powder is 1mm, and the particle size of the zeolite powder is 0.1mm; the particle size of the mineral powder is 0.2mm;
the preparation method comprises the following steps:
s1, weighing coarse aggregates, fine aggregates and mineral powder, mixing, heating to 180 ℃, and stirring for 30S to prepare mineral aggregate;
s2, weighing the composite fibers, the high-viscosity modifier and the mineral aggregate, mixing and stirring for 20S, adding asphalt at the temperature of 145 ℃, mixing and stirring for 1.5min, and obtaining a finished product.
Example 3: the present embodiment is different from embodiment 1 in that:
4.6kg of asphalt, 0.532kg of high-viscosity modifier, 0.12kg of composite fiber prepared in preparation example 3, 90kg of coarse aggregate, 20kg of fine aggregate and 5kg of mineral powder; the coarse aggregate is composed of 35kg of basalt 1 material and 55kg of basalt 2 material, the particle size of the basalt 1 material is 15mm, and the particle size of the basalt 2 material is 10mm; the fine aggregate is composed of 16kg of basalt powder and 4kg of zeolite powder; the particle size of the basalt powder is 3mm, and the particle size of the zeolite powder is 0.5mm; the particle size of the mineral powder is 1mm;
the preparation method comprises the following steps:
s1, weighing coarse aggregates, fine aggregates and mineral powder, mixing, heating to 220 ℃, and stirring for 30S to prepare mineral aggregate;
s2, weighing the composite fibers, the high-viscosity modifier and the mineral aggregate, mixing and stirring for 20S, adding asphalt at the temperature of 155 ℃, mixing and stirring for 1.5min, and obtaining a finished product.
Example 4: the present embodiment is different from embodiment 1 in that:
the preparation method of the composite fiber comprises the following steps:
weighing 1kg of polyester fiber and 0.08kg of viscose fiber, mixing and stirring, and then drying to obtain the composite fiber.
Example 5: the present embodiment is different from embodiment 1 in that:
the preparation method of the composite fiber comprises the following steps:
weighing 1kg of polyester fiber and 0.08kg of viscose fiber, placing the polyester fiber and the viscose fiber in 5kg of chitosan solution with the mass fraction of 1%, soaking for 3min, wherein the chitosan solution is chitosan-glacial acetic acid solution, carrying out ultrasonic dispersion under the condition of 20kHz in the soaking process, stirring for 5min at the speed of 250r/min after ultrasonic dispersion, taking out the soaked fiber, and drying to 50% to obtain the composite fiber.
Example 6: the present embodiment is different from embodiment 1 in that:
the preparation method of the composite fiber comprises the following steps:
weighing 1kg of polyester fiber and 0.08kg of viscose fiber, and stirring at the speed of 250r/min for 8min to prepare mixed fiber;
0.108kg of silane coupling agent KH-570 is weighed and sprayed on the surface of the mixed fiber, the mixed fiber is continuously stirred at the rotating speed of 80r/min in the spraying process, the spraying speed of the silane coupling agent KH-570 is 1g/s, and the drying degree is 50 percent, so that the composite fiber is prepared.
Example 7: the present embodiment is different from embodiment 1 in that:
the preparation method of the composite fiber comprises the following steps:
weighing 1kg of polyester fiber and 0.08kg of viscose fiber, placing the polyester fiber and the viscose fiber in 5kg of sodium alginate solution with the mass fraction of 1%, soaking for 3min, wherein the sodium alginate solution is sodium alginate water solution, carrying out ultrasonic dispersion under the condition of 20kHz in the soaking process, stirring for 5min at the speed of 250r/min after ultrasonic dispersion, and taking out the soaked fiber to prepare mixed fiber;
0.108kg of silane coupling agent KH-570 is weighed and sprayed on the surface of the mixed fiber, the mixed fiber is continuously stirred at the rotating speed of 80r/min in the spraying process, the spraying speed of the silane coupling agent KH-570 is 1g/s, and the drying degree is 50 percent, so that the composite fiber is prepared.
Example 8: the present embodiment is different from embodiment 1 in that:
the preparation method of the composite fiber comprises the following steps:
weighing 1kg of polyester fiber and 0.08kg of viscose fiber, soaking in 5kg of chitosan solution with the mass fraction of 1% for 3min, wherein the chitosan solution is chitosan-glacial acetic acid solution, performing ultrasonic dispersion under the condition of 20kHz in the soaking process, stirring for 5min at the speed of 250r/min after ultrasonic dispersion, and taking out the soaked fiber to prepare mixed fiber;
0.108kg of organic silicon waterproof agent is weighed and sprayed on the surface of the mixed fiber, the mixed fiber is continuously stirred at the rotating speed of 80r/min in the spraying process, the spraying speed of the organic silicon waterproof agent is 1g/s, and the drying degree is 50 percent, so that the composite fiber is prepared.
Example 9: the present embodiment is different from embodiment 1 in that:
the fine aggregate raw material is characterized in that the zeolite powder is replaced by basalt powder with the same quality.
Example 10: the present embodiment is different from embodiment 1 in that:
the basalt 1 material is replaced by the basalt 2 material with the same quality in the coarse aggregate raw material.
Comparative example
Comparative example 1: this comparative example differs from example 1 in that:
the viscose fiber is replaced by the polyester fiber with the same quality in the composite fiber raw material.
Comparative example 2: this comparative example differs from example 1 in that:
the composite fiber is short basalt fiber filament with a length of 3mm.
Comparative example 3: the comparative example differs from example 1 in that:
the raw materials are not added with composite fibers.
Performance test
1. Immersion marshall stability test
Preparing cold-mix asphalt by respectively adopting the preparation methods of the embodiments 1-10 and the comparative examples 1-3, detecting the stability of the cold-mix asphalt prepared in the embodiments 1-10 and the comparative examples 1-3 by referring to a Marshall stability test of a CJJ/T190-2012 permeable asphalt pavement technical specification and a JTGE20-2011 road engineering asphalt and asphalt mixture test specification, detecting the stability of the cold-mix asphalt after soaking and heat preservation for 48 hours, and recording data; the water-immersed Marshall stability meter characterizes the water damage resistance of the cold-mixed asphalt, namely the water stability.
2. Freezing and thawing cleavage test
The preparation methods of the embodiments 1-10 and the comparative examples 1-3 are respectively adopted to prepare the cold-mix asphalt, and the freeze-thaw splitting strength of the cold-mix asphalt is detected and data is recorded according to a CJJ/T190-2012 'permeable asphalt pavement technical specification', and a JTGE20-2011 'road engineering asphalt and asphalt mixture test specification' (T0729-2000 asphalt mixture freeze-thaw splitting test); the freeze-thaw cleavage test characterizes the water damage resistance of cold mixing, i.e., low temperature crack resistance.
3. Kentucky fly test
Preparing cold-mix asphalt by adopting the preparation methods of the examples 1-10 and the comparative examples 1-3 respectively, performing kentucker scattering test on a formed marshall test piece (each of two surfaces is hit 50 times) according to a reference of a kentucker scattering test of an asphalt mixture in CJJ/T190-2012 technical Specification for permeable asphalt pavements and JTGE20-2011 test Specification for road engineering asphalt and asphalt mixture, and recording scattering rate data; the Kentumbo scattering test is used for detecting the aggregate shedding and scattering degree of the road surface of the asphalt mixture under the action of traffic load, and representing the mechanical strength and the bonding effect of the cold-mixed asphalt.
4. Rut test
Preparing cold-mix asphalt by respectively adopting the preparation methods of the embodiments 1-10 and the comparative examples 1-3, performing a rutting test at 60 ℃ and 0.7MPa according to a rutting test of an asphalt mixture in CJJ/T190-2012 technical Specification for permeable asphalt pavements and JTGE20-2011 test Specification for road engineering asphalt and asphalt mixtures, and recording dynamic stability data; and characterizing the high-temperature stability of the cold-mixed asphalt.
TABLE 1 Performance test Table
It can be seen from the combination of the examples 1 and 2-3 and the table 1 that the asphalt mixture prepared by the present application has high stability, high freeze-thaw splitting strength, low flying rate and high dynamic stability, which indicates that the silane coupling agent KH-570, the chitosan solution, the viscose fiber, the polyester fiber, the coarse aggregate, the fine aggregate and the mineral powder are matched, and when the asphalt mixture is subjected to pressure, the viscose fiber and the polyester fiber deform, so that the chitosan solution and the asphalt material are bonded through chemical bonds, thereby improving the structural density of the asphalt mixture, and the silane coupling agent KH-570 facilitates the bonding of the coarse aggregate, the fine aggregate, the mineral powder and the asphalt material, thereby further improving the structural density of the asphalt mixture, and thus the cold-mixed asphalt has good water stability, low-temperature crack resistance and high-temperature resistance.
By combining example 1 with examples 4-10 and table 1, it can be seen that the composite fiber of example 4 is only a mixture of polyester fiber and viscose fiber, and is not treated with chitosan solution and silane coupling agent KH-570, compared with example 1, the asphalt mixture prepared by example 4 has a lower stability than example 1, a lower freeze-thaw splitting strength than example 1, a higher flying rate than example 1, and a lower dynamic stability than example 1; the matching of the chitosan solution, the silane coupling agent KH-570, the polyester fibers and the viscose fibers is illustrated, the polyester fibers and the viscose fibers are bonded with the asphalt material by the chitosan fibers, and the polyester fibers and the viscose fibers are connected with the coarse aggregate and the fine aggregate by the silane coupling agent KH-570, so that the internal structure of the asphalt mixture is connected tightly, and the water stability, the high temperature resistance and the low temperature crack resistance of the cold-mixed asphalt are improved.
In the preparation process of the composite fiber in the embodiment 5, the composite fiber is not treated by the silane coupling agent KH-570, compared with the embodiment 1, the asphalt mixture prepared in the embodiment 5 has the advantages that the stability is lower than that of the embodiment 1, the freeze-thaw splitting strength is lower than that of the embodiment 1, the flying rate is higher than that of the embodiment 1, and the dynamic stability is lower than that of the embodiment 1; the composite fiber which is not treated by the silane coupling agent KH-570 is not only poor in hydrophobic effect and easy to cause residual moisture in the asphalt mixture to influence the water invasion resistance, but also the coarse aggregate, the fine aggregate and the mineral powder only play the filling role and are difficult to cause the aggregate to generate a binding force with the composite fiber and the asphalt material, so that the water stability, the high-temperature stability and the low-temperature crack resistance of the cold-mixed asphalt are influenced.
In the preparation process of the composite fiber in the embodiment 6, the composite fiber is not treated by the chitosan solution, compared with the embodiment 1, the stability of the asphalt mixture prepared in the embodiment 6 is smaller than that of the embodiment 1, the freeze-thaw splitting strength is smaller than that of the embodiment 1, the scattering rate is larger than that of the embodiment 1, and the dynamic stability is smaller than that of the embodiment 1; the composite fiber which is not treated by the chitosan solution is not easy to generate chemical bond binding force with the asphalt material, so that the binding force of the composite fiber in the cold-mixed asphalt is influenced, and the water stability, the high-temperature stability and the low-temperature crack resistance of the cold-mixed asphalt are influenced.
In the preparation process of the composite fiber in the embodiment 7, the sodium alginate solution is used for replacing the chitosan solution, compared with the embodiment 1, the stability of the asphalt mixture prepared in the embodiment 7 is lower than that of the embodiment 1, the freeze-thaw splitting strength is lower than that of the embodiment 1, the flying rate is higher than that of the embodiment 1, and the dynamic stability is lower than that of the embodiment 1; the sodium alginate solution has no amino group, is not easy to generate binding force with asphalt acid, is water-soluble, and is easy to influence the water stability of the cold-mixed asphalt, and the chitosan is not soluble in water and is matched with the silane coupling agent KH-570 to have better hydrophobic effect, so that the water absorption of the asphalt mixture is further avoided, and the cold-mixed asphalt has better water stability, high-temperature stability and low-temperature crack resistance.
In the preparation process of the composite fiber in the embodiment 8, the organosilicon waterproof agent is used for replacing a silane coupling agent KH-570, compared with the embodiment 1, the stability of the asphalt mixture prepared in the embodiment 8 is smaller than that of the embodiment 1, the freeze-thaw splitting strength is smaller than that of the embodiment 1, the scattering rate is larger than that of the embodiment 1, and the dynamic stability is smaller than that of the embodiment 1; the organosilicon waterproof agent has a certain hydrophobic effect, but is not easy to connect coarse aggregates, fine aggregates, mineral powder and asphalt materials, so that the organosilicon waterproof agent has influence on the water stability, the high-temperature stability and the low-temperature crack resistance of the cold-mixed asphalt.
Example 9 in the fine aggregate raw material, the zeolite powder is replaced by the basalt powder with the same mass, compared with example 1, the stability of the asphalt mixture prepared in example 9 is lower than that of example 1, the freeze-thaw splitting strength is lower than that of example 1, the flying rate is higher than that of example 1, and the dynamic stability is lower than that of example 1; the matching of the basalt powder and the zeolite powder is illustrated, and the density of the cold-mixed asphalt structure is improved through the filling effect of the different-grade composite particles, so that the cold-mixed asphalt has better water stability, high-temperature stability and low-temperature crack resistance.
In the example 10, the basalt 1 material is replaced by the basalt 2 material with the same mass in the coarse aggregate raw material, compared with the example 1, the stability of the asphalt mixture prepared in the example 10 is lower than that of the example 1, the freeze-thaw splitting strength is lower than that of the example 1, the flying rate is higher than that of the example 1, and the dynamic stability is lower than that of the example 1; the matching of the basalt 1 material and the basalt 2 material is demonstrated, and the density of the asphalt mixture structure can be improved by mixing and stirring the basalt materials with different grading grain sizes, so that the cold-mixed asphalt has better water stability, high-temperature stability and low-temperature crack resistance.
By combining the example 1 and the comparative examples 1-3 and combining the table 1, it can be seen that, compared with the example 1, the asphalt mixture prepared by the comparative example 1 has the stability lower than that of the example 1, the freeze-thaw splitting strength lower than that of the example 1, the flying rate higher than that of the example 1 and the dynamic stability lower than that of the example 1 by replacing viscose with the polyester fiber with the same quality in the composite fiber raw material of the comparative example 1; the polyester fiber and the viscose fiber are matched, so that the network structure loaded chitosan is convenient to form, and when the asphalt mixture is stressed, the chitosan in the composite fiber is promoted to be contacted and connected with an asphalt material by utilizing the good flexibility and elasticity of the asphalt mixture to generate deformation, so that the water stability, the high-temperature stability and the low-temperature crack resistance of the cold-mixed asphalt are improved.
Compared with the example 1, the stability of the asphalt mixture prepared in the comparative example 2 is lower than that of the example 1, the freeze-thaw splitting strength is lower than that of the example 1, the flying rate is higher than that of the example 1, and the dynamic stability is lower than that of the example 1; the basalt fiber short cut threads with strong rigidity are shown, the mechanical strength of the asphalt material is improved only through the filling action part, but the basalt fiber short cut threads and the asphalt material have poor bonding effect, so that the bonding effect of various raw materials in the asphalt mixture is influenced, and the water stability, the high-temperature stability and the low-temperature crack resistance of the cold-mixed asphalt are influenced.
Compared with the example 1, the asphalt mixture prepared in the comparative example 3 has the advantages that the stability is lower than that of the example 1, the freeze-thaw splitting strength is lower than that of the example 1, the flying rate is higher than that of the example 1, and the dynamic stability is lower than that of the example 1; the matching of the composite fibers, the coarse aggregate, the fine aggregate and the mineral powder is illustrated, and the structural density of the asphalt mixture is further improved by utilizing the connecting action of the composite fibers and the filling action of the powder, so that the water stability, the high-temperature stability and the low-temperature crack resistance of the cold-mix asphalt are improved.
The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.
Claims (7)
1. The anti-cracking cold-mixed asphalt for pavement repair is characterized by being prepared from the following raw materials in parts by weight: 3.8-4.6 parts of asphalt, 0.485-0.532 part of high-viscosity modifier, 0.09-0.12 part of composite fiber, 72-90 parts of coarse aggregate, 10.5-20 parts of fine aggregate and 1-5 parts of mineral powder; the composite fiber consists of polyester fiber and viscose fiber in a weight ratio of 1; the coarse aggregate is prepared from the following raw materials in parts by weight: 26-35 parts of basalt 1 material and 46-55 parts of basalt 2 material; the fine aggregate consists of basalt powder and zeolite powder in a weight ratio of 1.05-0.25;
the composite fiber is prepared by the following method:
weighing polyester fibers and viscose fibers, soaking the polyester fibers and the viscose fibers in a chitosan solution, performing ultrasonic dispersion, stirring, and taking out the soaked fibers to prepare mixed fibers;
spraying a silane coupling agent KH-570 on the surface of the mixed fiber, wherein the weight ratio of the mixed fiber to the silane coupling agent KH-570 is 1.05-0.2, and drying to obtain the composite fiber.
2. The anti-cracking cold-mix asphalt for road restoration according to claim 1, wherein the particle size of the basalt 1 material is 10-15mm, and the particle size of the basalt 2 material is 5-10mm.
3. The anti-cracking cold-mix asphalt for pavement restoration according to claim 1, wherein the basalt powder has a particle size of 1-3mm, and the zeolite powder has a particle size of 0.1-0.5mm.
4. The anti-cracking cold-mix asphalt for road restoration according to claim 1, wherein the mineral powder has a particle size of 0.2 to 1mm.
5. The anti-cracking cold-mix asphalt for road restoration according to claim 1, wherein the chitosan solution is a chitosan-glacial acetic acid solution with a mass fraction of 0.5-2%.
6. The crack-resistant cold-mix asphalt for pavement restoration according to claim 1, wherein the silane coupling agent KH-570 spraying speed is 0.5-3g/s, and the mixing speed of the mixed fibers is 50-120r/min.
7. The method for preparing the crack-resistant cold-mix asphalt for road restoration according to any one of claims 1 to 6, comprising the steps of:
s1, weighing coarse aggregate, fine aggregate and mineral powder, mixing, heating to 180-220 ℃, and stirring to obtain mineral aggregate;
s2, weighing the composite fibers, the high-viscosity modifier and mineral aggregate, mixing and stirring, adding asphalt at the temperature of 145-155 ℃, mixing and stirring uniformly to obtain a finished product.
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| CN115180876B (en) * | 2022-07-05 | 2023-07-18 | 新乡市通达公路新科技有限公司 | Cold mix agent for repairing pit |
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