CN114075053B - Ultrathin overlay mixture for preventive maintenance of asphalt pavement, preparation method and additive - Google Patents
Ultrathin overlay mixture for preventive maintenance of asphalt pavement, preparation method and additive Download PDFInfo
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- CN114075053B CN114075053B CN202010801370.0A CN202010801370A CN114075053B CN 114075053 B CN114075053 B CN 114075053B CN 202010801370 A CN202010801370 A CN 202010801370A CN 114075053 B CN114075053 B CN 114075053B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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 invention discloses a preventive maintenance ultrathin overlay mixture for an asphalt pavement, a preparation method and an additive, wherein the mixture comprises the following components: 80 to 90 percent of aggregate, 5 to 15 percent of mineral powder, 4 to 4.8 percent of asphalt and 0.15 to 0.6 percent of ultrathin finishing coat additive for preventive maintenance of asphalt pavement; the components of the ultrathin overlay additive for preventive maintenance of the asphalt pavement are as follows: 40-50% of thermoplastic elastomer, 35-45% of 4006 industrial white oil, 1-10% of polyethylene wax and 5-15% of C5 petroleum resin; the additive for the asphalt pavement preventive maintenance ultrathin covering is reasonable in formula, can improve the flying resistance and water loss resistance of asphalt pavement preventive maintenance ultrathin covering mixture, improves the flexibility of covering concrete, has good fatigue resistance and cracking resistance, is produced by directly putting the additive into a mixing station, does not need special equipment, is simple in process, and is beneficial to wide popularization and application.
Description
Technical Field
The invention belongs to the technical field of preventive maintenance of asphalt pavements, and particularly relates to preventive maintenance of an asphalt pavement.
Background
The ultrathin cover is mainly used for recovering the anti-skid performance of the old road surface, can also be used for building a new road, and has the advantages of safe and comfortable driving, low noise level and conservation of maintenance and construction cost. Meanwhile, the pavement thickness is small, the whole bearing capacity of the road surface is improved slightly, and the ultrathin cover surface only plays a functional role, and is suitable for old road cover surfaces, functional layers of various newly-built roads and surface layers of roads with low traffic and low manufacturing cost. The hot-mix ultra-thin wearing layer novachi is a typical representation of the ultra-thin overlay technology, which was introduced into china in 2003 and is mainly used for preventive maintenance of high-grade highways and corrective maintenance of minor diseases. The method is applied to large areas in China from 2006, and the annual application amount is between 300 and 600 ten thousand square meters to date. However, the adhesive layer asphalt and asphalt binder adopted by the ultra-thin wearing layer both need to adopt special asphalt, and a construction machine must adopt a special thin layer paver, so that the construction cost is high, and the further popularization and application of the technology are restricted.
As a surface functional layer, the mechanical requirement and the mixture mixing proportion design of the ultrathin overlay are equal to those of a conventional asphalt concrete surface layer, so that the ultrathin overlay has great difference and is reflected in the following five aspects:
(1) The interlayer combination is important, under the traffic load action, the shear stress between the ultrathin overlay and the lower overlay is far greater than that of the conventional asphalt overlay, the requirement on interlayer combination is higher, and high-viscosity emulsified asphalt or rubber asphalt is generally required;
(2) The strength requirement is not high: the ultrathin overlay is generally used for preventive maintenance engineering of asphalt pavements with higher road bearing capacity and more complete surface layers, the lower bearing layer has higher strength, the layer thickness is small, and the aggregate can exert the strength more easily, so that the ultra-thin overlay is not required to have overhigh strength, particularly the elasticity and the high-temperature performance of a cementing material are not required to be too high, and the fatigue cracking resistance of the ultra-thin overlay is more concerned;
(3) The material requirement is high: coarse aggregates require good attrition to avoid premature degradation of the slip resistance. The cement requires good adhesion and avoids flying. In the construction process, the temperature of the ultrathin cover surface is quickly reduced, and vibration compaction is not easy to adopt, so that a cementing material with an excessively high softening point is not recommended, and the workability of a mixture is very important;
(4) The grading type is special, in order to facilitate demulsification of viscous layer oil and avoid oil flooding, discontinuous grading or open grading is generally adopted, and continuous grading is used with caution. Meanwhile, in order to ensure the matching with the layer thickness, the nominal maximum particle size is also limited and generally does not exceed 11mm.
Therefore, the development of an ultrathin cover surface technology with higher cost performance is of great significance, aiming at the problem, an additive which can improve the flying-off resistance and the water loss resistance of a mixture, improve the flexibility of surface concrete and have good fatigue resistance and cracking resistance is developed, and particularly, the mixture technology made by the additive is needed in the world.
Disclosure of Invention
In view of the above disadvantages, one of the objectives of the present invention is to provide a preventive maintenance ultra-thin overlay additive for asphalt pavement, which has a reasonable formulation, can improve the anti-scattering ability and the anti-water loss ability of the mixture, simultaneously improve the flexibility of the overlay concrete, and has good fatigue resistance and crack resistance.
The invention also aims to provide the asphalt pavement preventive maintenance ultrathin overlay mixture which is reasonable in formula, and has good structural depth and fatigue and cracking resistance.
The invention also aims to provide a preparation method of the ultrathin maintenance overlay additive for the preventive maintenance of the asphalt pavement, and the preparation method is simple in process, easy to implement and high in production efficiency.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an ultrathin overlay additive for preventive maintenance of an asphalt pavement comprises the following components in percentage by mass:
an ultrathin overlay mixture for preventive maintenance of an asphalt pavement comprises the following components in percentage by mass:
the preparation method of the ultrathin overlay mixture for preventive maintenance of the asphalt pavement is characterized by comprising the following steps of:
(1) Preparing raw materials: the raw materials comprise the following components in percentage by mass: 80-90% of aggregate, 5-15% of mineral powder and 4-4.8% of asphalt, wherein the additive for the preventive maintenance ultrathin top coat of the asphalt pavement is 0.15-0.6%;
(2) Heating: heating the aggregate to 160-170 ℃ and sending the aggregate into a hot material bin of an asphalt mixing station;
(3) Stirring: adding the asphalt pavement preventive maintenance ultrathin overlay additive into a hot material bin of an asphalt mixing station, and stirring for 5-10 seconds;
(4) Mixing: and adding asphalt and mineral powder into a hot material bin of an asphalt mixing station, and continuously stirring for 30-40 seconds to prepare the asphalt pavement preventive maintenance ultrathin overlay mixture.
The asphalt pavement preventive maintenance ultrathin overlay additive is directly added into an asphalt mixture in a direct-throwing mode and is used for improving the comprehensive pavement performance of the mixture. At present, only a high-viscosity additive adopted by 'easy compaction' is added into an ultrathin overlay, but the additive has the biggest problem that the high-temperature performance and strength of the material are considered too much, so that the melting point of the material is higher, the aggregate can be melted and uniformly dispersed when being heated to 190 ℃, and the requirements on the temperature of production, paving and rolling of a mixture are higher. The biggest risk of the ultrathin cover surface is that the temperature loss is quick, so that the rolling difficulty is increased, and the compaction degree is not easy to achieve. Therefore, although the material has better performance, the final pavement performance is not ideal, so the 'easy compaction' technology needs to add rolling aids or warm mixing additives to improve the rolling performance during construction. On the other hand, as mentioned above, the ultra-thin cover is not so high in mechanical strength of the material, and the deformation coordination capability of the material and the cracking resistance capability should be considered. The modified material developed based on the knowledge of the additive for the preventive maintenance ultrathin overlay of the asphalt pavement properly reduces the high-temperature performance and the strength requirement of the material, and improves the low-temperature flexibility and the bonding performance of the material. The corresponding adjustment greatly reduces the manufacturing cost of the material.
As a preferable scheme of the invention, the aggregate is one or a mixture of more of machine-made sand, stone chips, basalt and diabase. The particle size of the machine-made sand and the stone chips is less than 3mm. The aggregate is divided into two grades, and the grading specification is divided according to the grain diameter of less than 3mm and 3-5mm, wherein the basalt and diabase with higher strength and good wear resistance are preferably selected for the grain diameter of 3-5 mm. The maximum particle size of the aggregate with the specification of 3-5mm is two purposes: firstly, the stone material is the material with the least use amount in all asphalt mixtures but the production amount of stone factories is not small, so the overall price is the lowest; secondly, the stone material can effectively break through the requirement of the conventional ultrathin cover on the layer thickness, and the thickness is reduced from more than 1.5cm to more than 1 cm. The aggregate of 0.10-3 mm can be made of machine-made sand or stone chips, and must be 100% crushed and processed, and should be clean, dry, weatherproof, free of impurities, and have good binding capacity with asphalt.
As a preferable scheme of the invention, the asphalt is 70# or 90# heavy traffic road petroleum asphalt.
The invention has the beneficial effects that: the additive for the asphalt pavement preventive maintenance ultrathin covering is reasonable in formula, properly reduces the high-temperature performance and strength requirement of the material, improves the low-temperature flexibility and bonding performance of the material, greatly reduces the manufacturing cost of the material by corresponding adjustment, can improve the flying-off resistance and water loss resistance of an asphalt pavement preventive maintenance ultrathin covering mixture, improves the flexibility of the covering concrete, and has good fatigue resistance and cracking resistance; the preparation method of the asphalt pavement preventive maintenance ultrathin overlay additive provided by the invention adopts a mixture direct-throwing mode, has the advantages of simple process, easiness in realization and high production efficiency, can quickly prepare an asphalt pavement preventive maintenance ultrathin overlay mixture product with excellent performance, and is beneficial to wide popularization and application.
The present invention will be further described with reference to the following examples.
Detailed Description
Example 1: the embodiment provides a preparation method of an ultrathin top facing mixture for preventive maintenance of an asphalt pavement, which comprises the following steps:
(1) Preparing raw materials: the raw materials comprise the following components in percentage by mass: 85% of aggregate, 10% of mineral powder, 4.6% of asphalt and 0.4% of asphalt pavement preventive maintenance ultrathin finishing coat additive;
the ultrathin overlay additive for preventive maintenance of the asphalt pavement comprises the following components in percentage by mass: 45% of thermoplastic elastomer, 40% of 4006 industrial white oil, 2% of polyethylene wax and 10% of C5 petroleum resin;
(2) Heating: heating the aggregate to 160-170 ℃ and sending the aggregate into a hot stock bin of an asphalt mixing station;
(3) Stirring: adding the ultrathin overlay additive for preventive maintenance of the asphalt pavement into a hot storage bin of an asphalt mixing station, and stirring for 5-10 seconds, preferably 10 seconds;
(4) Mixing: and adding the asphalt and the mineral powder into a hot material bin of an asphalt mixing station, and continuously stirring for 30-40 seconds, preferably 10-40 seconds to prepare the asphalt pavement preventive maintenance ultrathin covering mixture.
The thermoplastic elastomer is preferably thermoplastic styrene-butadiene rubber (SBS), and the technical indexes of the thermoplastic elastomer are shown in the following table 1;
TABLE 1
Preferably, the 4006 industrial white oil has the technical indexes shown in the following table 2.
TABLE 2
Preferably, the polyethylene wax is white particles, and the technical indexes of the polyethylene wax are shown in the following table 3.
TABLE 3
Preferably, the C5 petroleum resin is a milky yellow transparent particle, the C5 petroleum resin not only has good tackifying effect, but also has good operability and stable product performance, and the technical indexes are shown in the following table 4.
TABLE 4
| Item | Quality index | Detection method |
| Softening point (R)&B),℃ | 120±5℃ | ASTM-E28 |
| Specific gravity 60 ℃ F. (15.6 ℃ C.) | 1.05～1.10 | ASTM-D71 |
| Ash content | ＜0.05％ | ASTM-D2415 |
| Acid value (mg KOH/g) | ＜0.1 | ASTM-D-974-64 |
| Bromine number (cg/g) | ＜25 | ASTM-D1159 |
The performance indexes of the ultrathin overlay additive for preventive maintenance of the asphalt pavement, which is prepared by the invention, and the easily-compacted products on the market are shown in the following table 5:
TABLE 5
The indexes of the ultrathin overlay mixture for preventive maintenance of the asphalt pavement are shown in the following table 6:
example 2, this example provides a method for preparing an asphalt pavement preventive maintenance ultrathin finishing mixture, which is substantially the same as example 1 except that the components and the mass percentages of the asphalt pavement preventive maintenance ultrathin finishing additive and the asphalt pavement preventive maintenance ultrathin finishing mixture are different. The components and the mass percentage of the ultrathin overlay mixture for preventive maintenance of the asphalt pavement are as follows: 90% of aggregate, 5% of mineral powder, 4.5% of asphalt and 0.5% of asphalt pavement preventive maintenance ultrathin finishing coat additive; the asphalt pavement preventive maintenance ultrathin overlay additive comprises the following components in percentage by mass: 40% of thermoplastic elastomer, 45% of 4006 industrial white oil, 10% of polyethylene wax and 5% of C5 petroleum resin.
Example 3: the additive for the ultrathin top coat for preventive maintenance of the asphalt pavement and the preparation method thereof provided by the embodiment are basically the same as those in the embodiment 1, and the difference is that the components and mass percentages of the additive for the ultrathin top coat for preventive maintenance of the asphalt pavement and the mixture for the ultrathin top coat for preventive maintenance of the asphalt pavement are different. The components and the mass percentage of the ultrathin overlay mixture for the preventive maintenance of the asphalt pavement are as follows: 80% of aggregate, 15% of mineral powder, 4.4% of asphalt and 0.6% of asphalt pavement preventive maintenance ultrathin finishing additive; the asphalt pavement preventive maintenance ultrathin overlay additive comprises the following components in percentage by mass: 50% of thermoplastic elastomer, 35% of 4006 industrial white oil, 8% of polyethylene wax and 7% of C5 petroleum resin.
Example 4: the additive for the ultrathin top coat for preventive maintenance of the asphalt pavement and the preparation method thereof provided by the embodiment are basically the same as those in the embodiment 1, and the difference is that the components and mass percentages of the additive for the ultrathin top coat for preventive maintenance of the asphalt pavement and the mixture for the ultrathin top coat for preventive maintenance of the asphalt pavement are different. The components and the mass percentage of the ultrathin overlay mixture for the preventive maintenance of the asphalt pavement are as follows: 83% of aggregate, 11.95% of mineral powder, 4.8% of asphalt and 0.15% of asphalt pavement preventive maintenance ultrathin finishing coat additive; the asphalt pavement preventive maintenance ultrathin overlay additive comprises the following components in percentage by mass: 48% of thermoplastic elastomer, 36% of 4006 industrial white oil, 1% of polyethylene wax and 15% of C5 petroleum resin.
Example 5: the additive for the asphalt pavement preventive maintenance ultrathin finishing coat and the preparation method thereof provided by the embodiment are basically the same as those in the embodiment 1, and the difference is that the components and the mass percentages of the additive for the asphalt pavement preventive maintenance ultrathin finishing coat and the mixture for the asphalt pavement preventive maintenance ultrathin finishing coat are different. The components and the mass percentage of the ultrathin overlay mixture for the preventive maintenance of the asphalt pavement are as follows: 89.4% of aggregate, 6.3% of mineral powder, 4% of asphalt and 0.3% of asphalt pavement preventive maintenance ultrathin finishing additive; the asphalt pavement preventive maintenance ultrathin overlay additive comprises the following components in percentage by mass: 44% of thermoplastic elastomer, 42% of 4006 industrial white oil, 6% of polyethylene wax and 8% of C5 petroleum resin.
Example 6: the additive for the asphalt pavement preventive maintenance ultrathin finishing coat and the preparation method thereof provided by the embodiment are basically the same as those in the embodiment 1, and the difference is that the components and the mass percentages of the additive for the asphalt pavement preventive maintenance ultrathin finishing coat and the mixture for the asphalt pavement preventive maintenance ultrathin finishing coat are different. The components and the mass percentage of the ultrathin overlay mixture for the preventive maintenance of the asphalt pavement are as follows: 86.8% of aggregate, 8.6% of mineral powder, 4.2% of asphalt and 0.4% of asphalt pavement preventive maintenance ultrathin finishing coat additive; the asphalt pavement preventive maintenance ultrathin overlay additive comprises the following components in percentage by mass: 43% of thermoplastic elastomer, 38% of 4006 industrial white oil, 7% of polyethylene wax and 12% of C5 petroleum resin.
The above examples are only preferred embodiments of the present invention, and the present invention is not limited to all the embodiments, and any technical solution using one of the above examples or equivalent changes made according to the above examples are within the scope of the present invention.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (5)
1. The ultrathin overlay mixture for preventive maintenance of the asphalt pavement is characterized by comprising the following components in percentage by mass:
80 to 90 percent of aggregate,
5 to 15 percent of mineral powder,
4 to 4.8 percent of asphalt,
0.15 to 0.6 percent of ultrathin finishing coat additive for preventive maintenance of asphalt pavement,
the ultrathin overlay additive for preventive maintenance of the asphalt pavement comprises the following components in percentage by mass:
the aggregate is one or a mixture of a plurality of kinds of machine-made sand, stone chips, basalt and diabase, the aggregate is divided into two grades, and the grading specification is divided according to the grain diameter of less than 3mm and 3-5 mm.
2. The ultra-thin overlay compound for preventive maintenance of asphalt pavement according to claim 1, wherein the asphalt is 70# or 90# heavy traffic road petroleum asphalt.
3. A method for preparing an ultra-thin overlay mixture for preventive maintenance of asphalt pavement according to claim 1 or 2, comprising the steps of:
(1) Preparing raw materials: the raw materials comprise the following components in percentage by mass: 80-90% of aggregate, 5-15% of mineral powder, 4-4.8% of asphalt and 0.15-0.6% of the additive for the preventive maintenance ultrathin finishing coat of the asphalt pavement according to claim 1;
(2) Heating: heating the aggregate to 160-170 ℃ and sending the aggregate into a hot stock bin of an asphalt mixing station;
(3) Stirring: adding the asphalt pavement preventive maintenance ultrathin finishing additive into a hot material bin of an asphalt mixing station, and stirring for 5-10 seconds;
(4) Mixing: and adding asphalt and mineral powder into a hot material bin of an asphalt mixing station, and continuously stirring for 30-40 seconds to prepare the asphalt pavement preventive maintenance ultrathin overlay mixture.
4. The method for preparing the ultra-thin overlay mixture for preventive maintenance of asphalt pavements according to claim 3, wherein the aggregate is one or more of machine-made sand, stone chips, basalt and diabase.
5. The method for preparing the ultra-thin overlay mixture for preventive maintenance of asphalt pavement according to claim 3, wherein the asphalt is petroleum asphalt for 70# or 90# heavy traffic roads.
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| CN114163830B (en) * | 2021-11-19 | 2023-03-10 | 中路交科科技股份有限公司 | Direct-adding instant asphalt modifier and preparation method thereof |
| CN117003512A (en) * | 2023-08-17 | 2023-11-07 | 广州方华交通技术有限公司 | Super-tough asphalt concrete for paving ultrathin overlay and preparation method thereof |
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| CN105271949A (en) * | 2015-11-17 | 2016-01-27 | 江苏中路新材料科技发展有限公司 | Design method and preparing method for dense-gradation ultrathin paving asphalt mixture and application of asphalt mixture |
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| CN111286207A (en) * | 2020-02-26 | 2020-06-16 | 成都交通投资集团有限公司 | Modified asphalt composition for warm-mix thin-layer overlay and preparation method thereof |
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| KR101496628B1 (en) * | 2013-02-19 | 2015-02-26 | 허정도 | Compositions of new, highly visco-elastic, warm-mix modifiers and their manufacturing methods, and compositions of warm, modified, virgin and recycled asphalt concrete mixes and their manufacturing methods |
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| CN109650781A (en) * | 2018-12-29 | 2019-04-19 | 中设设计集团股份有限公司 | A kind of high frictional resistance thin overlay asphalt of middle low temperature warm mix and preparation method thereof |
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