CN111501467B - Method for improving initial anti-skid performance of asphalt mastic macadam wearing layer - Google Patents
Method for improving initial anti-skid performance of asphalt mastic macadam wearing layer Download PDFInfo
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- CN111501467B CN111501467B CN202010283800.4A CN202010283800A CN111501467B CN 111501467 B CN111501467 B CN 111501467B CN 202010283800 A CN202010283800 A CN 202010283800A CN 111501467 B CN111501467 B CN 111501467B
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- stone
- asphalt
- asphalt mastic
- spreading
- wearing layer
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- 239000010426 asphalt Substances 0.000 title claims abstract description 67
- 239000013521 mastic Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000004575 stone Substances 0.000 claims abstract description 42
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 238000010276 construction Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 239000003208 petroleum Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 2
- 238000005299 abrasion Methods 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 11
- 238000001514 detection method Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 6
- 238000005056 compaction Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
- E01C7/353—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with exclusively bituminous binders; Aggregate, fillers or other additives for application on or in the surface of toppings with exclusively bituminous binders, e.g. for roughening or clearing
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4806—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing
- E01C19/482—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely rollers for consolidating or finishing the materials being uncoated stone or similar granular materials, e.g. sand
-
- 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
- Y02A30/60—Planning or developing urban green infrastructure
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a method for improving initial anti-skid performance of an asphalt mastic macadam wearing layer, and belongs to the field of road engineering. The method comprises the following steps: a. spreading a certain amount of stone on the surface of the loose asphalt mastic macadam mixture after spreading; b. and (3) rolling and forming the stone and the asphalt mastic stone mixture. Compared with the prior art, the method for improving the initial anti-skid performance of the asphalt mastic broken stone wearing layer can solve the problem of insufficient initial anti-skid coefficient of a newly paved asphalt mastic broken stone concrete pavement, improves the initial anti-skid performance of the pavement, and has good popularization and application values.
Description
Technical Field
The invention relates to the field of road engineering, and particularly provides a method for improving initial anti-skid performance of an asphalt mastic macadam wearing layer.
Background
In recent years, along with the rapid development of the economy in China, the road traffic infrastructure has been well developed. In the construction of highways, the asphalt mastic broken stone mixture becomes a wearing layer of most high-grade pavements with excellent comprehensive properties. However, because the asphalt membrane of the asphalt mastic macadam mixture is thicker, the anti-skid performance of the newly-repaired pavement is poorer before the asphalt membrane is worn by vehicles, and the driving safety of road vehicles is directly affected. In order to ensure the initial anti-skid performance of the pavement, the prior art usually takes a larger value for the void ratio of the asphalt mixture, which easily causes water seepage of the pavement, thereby causing diseases such as pits, looseness and the like on the pavement, seriously affecting the service life of the pavement and increasing the use and maintenance cost of the pavement.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for improving the initial anti-skid performance of an asphalt mastic macadam wearing layer, so as to solve the problem of insufficient initial anti-skid coefficient of a newly paved asphalt mastic macadam concrete pavement and improve the initial anti-skid performance of the pavement.
The technical scheme adopted for solving the technical problems is as follows: a method for improving the initial skid resistance of an asphalt mastic macadam wearing layer, comprising the following steps:
a. spreading a certain amount of stone on the surface of the loose asphalt mastic macadam mixture after spreading;
b. and (3) rolling and forming the stone and the asphalt mastic stone mixture.
In order to improve the bonding strength of the stone with the asphalt, the stone is preferably dedusted and pre-asphalt coated before being spread. Preferably, the stone can be subjected to dust removal and pre-asphalt coating treatment by adding 0.3-0.5% of road petroleum asphalt into the stone through a batch asphalt mixing station.
The spreading amount of the stone is preferably 1-2kg/m 2 . The excessive spreading amount can cause insufficient bonding of stone and asphalt mastic mixture, and the stone falls off under the action of running; too small, insufficient initial anti-skid properties may occur.
Preferably, the stone has a particle size of 3-5mm, a crushing value of not more than 26% and a wear loss of not more than 28; the content of needle-shaped particles is not more than 15%, the content of soft stone is not more than 3%, the adhesiveness is not less than 4 grades, the dust content is not more than 1%, and the number of broken surfaces is more than 4.
The method of the invention is to spread stones on the road surface which is not rolled, and then roll the stones together. The three steps of paving, spreading and rolling can be respectively finished by respective existing construction equipment, and the existing construction equipment can be integrated, for example, a spreading device is additionally arranged at the rear end of the paving device; a spreading device is additionally arranged at the front end of the rolling device. Preferably, the stone spreading device is fixed at the front end of the rolling device to synchronously perform stone spreading and rolling forming so as to ensure that the rolling can be performed immediately after the stone spreading is completed.
The rolling device is preferably a road roller, in particular a double steel wheel road roller.
The pavement temperature is preferably not lower than 150 ℃ during stone spreading and rolling forming, so that the problems that the spread stone is difficult to adhere to the asphalt mastic macadam mixture and the pavement is difficult to compact due to the excessively low temperature are avoided.
The depth of construction of the finished pavement after rolling is preferably 0.9-1.1, and the transverse force coefficient SFC is not less than 56.
Compared with the prior art, the method for improving the initial anti-skid performance of the asphalt mastic macadam wearing layer has the following outstanding beneficial effects:
firstly, the method is simple and easy to operate and has low cost;
secondly, the thickness of the surface asphalt film can be reduced, the problems of small initial anti-skid coefficient and insufficient anti-skid performance of the surface layer of the newly paved asphalt mastic stabilized macadam pavement are greatly improved, and the initial anti-skid performance of the pavement is enhanced;
and thirdly, the damping of the friction coefficient of the surface of the asphalt mastic broken stone mixture can be delayed, the safety performance of the road surface is improved, the driving safety and comfort are ensured, and the service life of the road is prolonged.
Drawings
FIG. 1 is a graph showing the grading of an example mastic asphalt mixture;
FIG. 2 is a flow chart of an example method of improving the initial skid resistance of an asphalt mastic macadam wearing layer;
fig. 3 is a schematic structural view of an embodiment rolling device.
Detailed Description
The invention will now be further described with reference to the drawings and specific examples, which are not intended to limit the invention.
[ example ]
1. Asphalt mastic asphalt mixture composition
1.1 raw materials
(1) Asphalt SBS modified asphalt;
(2) Coarse aggregate 10-15mm and coarse aggregate 5-10mm;
(3) Fine aggregate of 0-3mm;
(4) And (3) filling: mineral powder and lime powder.
1.2 grading composition
Target fit ratios are shown in table 1; the passing rates of the mesh holes for the design target grading are shown in fig. 1 and table 2.
Table 1 design target mix ratio
Table 2 design target grading Each Screen mesh pass Rate
1.3 design index of mixture
The optimum asphalt content of the asphalt mastic macadam mixture was 6.0% (the asphalt content test results are shown in Table 3).
Table 3 results of asphalt content determination test
| Test index | Test results |
| Test index | Adding wood fiber accounting for 0.3 percent of the total weight of the mixture |
| Asphalt content, percent | 6.0 |
| Void ratio VV,% | 4.1 |
| Mineral aggregate gap ratio VMA% | 17.3 |
| Asphalt saturation VFA, percent | 76.0 |
| Xie Lunbao asphalt leakage, percent | 0.069 |
| Kentaburg fly-away, percent | 5.78 |
1.4 others
In order to improve the water damage resistance of the mixture, quicklime powder accounting for 1.3+/-0.3 percent of the total weight of the mixture is added to replace part of mineral powder.
2. Rolling of asphalt mastic asphalt mixture
The rolling process is shown in fig. 2:
(1) Spreading asphalt mixture with 3-5mm pre-mixed asphalt macadam with asphalt content of 0.3% (macadam is pre-mixed and dedusted by mixing road petroleum asphalt in a mixing station of an intermittent asphalt mixing station) with spreading amount of 1.8kg/m 2 。
The technical indexes of the stone breaking are as follows:
(2) Compacting technology (actual measurement pavement temperature 150 ℃ C.)
Initially: the compaction adopts high-frequency compaction, the higher the frequency is, the more suitable for thin layer compaction, and the amplitude is selected to be low. At the speed of 3 km/h, the track is overlapped with the track when the vehicle moves backward and the track is overlapped with each other when the vehicle moves forward, and the adjacent track is overlapped by about 1/3 to 1/4 of the track;
and (3) re-pressing: repeating the process for 4 times according to the initial compaction process;
final pressure: the steel wheel road roller is used for polishing for 2 times.
The steps (1) and (2) can be completed by adopting the double-steel-wheel road roller 1 with the front end provided with the spreading device 2 as shown in figure 3, so as to ensure that the stone can be rolled immediately after spreading. The spreading device 2 may be any stone spreading device known in the art.
3. Transverse force coefficient detection
After the final pressure is finished, the road surface layer is subjected to transverse force coefficient detection by using a method for testing the friction coefficient of the road surface by using a single-wheel transverse force coefficient testing system, and the detection result is shown in table 5.
Table 5 detection of transverse force coefficient raw records
[ comparative example ]
1. Asphalt mastic asphalt mixture design
The design results of the asphalt mastic asphalt mixture are the same as in the examples.
2. Rolling of asphalt mastic asphalt mixture
The rolling process is as follows:
(1) Immediately rolling after the asphalt mixture is paved, and measuring the rolling temperature to 150 ℃.
(2) Compacting process
The compaction process is the same as in the examples.
3. Transverse force coefficient detection
After the final pressure is finished, the road surface layer is subjected to transverse force coefficient detection by using a method for testing the friction coefficient of the road surface by using a single-wheel transverse force coefficient testing system, and the detection result is shown in table 6.
TABLE 6 detection of transverse force coefficients raw records
The detection result shows that the initial transverse force coefficient value of the asphalt mastic broken stone wearing layer processed by the method is obviously improved from 49.9 to 59.9 after finishing the final pressing, so that the friction coefficient of the asphalt mastic broken stone wearing layer meets the requirements of the construction technical specifications of highway asphalt pavement, and the initial anti-skid performance of the asphalt mastic broken stone wearing layer is obviously improved.
Claims (2)
1. A method for improving the initial skid resistance of an asphalt mastic macadam wearing layer, which is characterized by comprising the following steps:
a. spreading a certain amount of stone on the surface of the loose asphalt mastic stone mixture with the spreading amount of 1-2kg/m 2 The stone material is subjected to dust removal and pre-coating asphalt treatment by doping 0.3-0.5% of road petroleum asphalt in an intermittent asphalt mixing station, the particle size of the stone material is 3-5mm, the crushing value is not more than 26%, and the abrasion loss is not more than 28; the content of needle-shaped sheets is not more than 15%, the content of soft stones is not more than 3%, the adhesiveness is not less than 4 grades, the dust content is not more than 1%, and the number of broken surfaces is more than 4;
b. rolling and molding stone and asphalt mastic stone mixture, wherein the transverse force coefficient SFC of the rolled finished road surface is not less than 56, the road surface construction depth is 0.9-1.1,
when stone is spread and rolled, the pavement temperature is not lower than 150 ℃,
the rolling device with the stone spreading device fixed at the front end synchronously completes stone spreading and rolling forming.
2. The method for improving the initial skid resistance of an asphalt mastic macadam wearing layer according to claim 1, wherein: the rolling device is a double-steel-wheel road roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010283800.4A CN111501467B (en) | 2020-04-13 | 2020-04-13 | Method for improving initial anti-skid performance of asphalt mastic macadam wearing layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010283800.4A CN111501467B (en) | 2020-04-13 | 2020-04-13 | Method for improving initial anti-skid performance of asphalt mastic macadam wearing layer |
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| Publication Number | Publication Date |
|---|---|
| CN111501467A CN111501467A (en) | 2020-08-07 |
| CN111501467B true CN111501467B (en) | 2023-12-22 |
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| CN112523025A (en) * | 2020-11-02 | 2021-03-19 | 广东冠粤路桥有限公司 | Sand spraying process for improving initial skid resistance of SMA pavement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104233918A (en) * | 2014-09-26 | 2014-12-24 | 南京同安道路工程有限公司 | Large-grain-diameter rubber block-modified asphalt mastic and gravel sealing layer and preparation method thereof |
| CN106948235A (en) * | 2017-04-07 | 2017-07-14 | 北京特希达交通勘察设计院有限公司 | A kind of bituminous paving interlayer construction method |
| CN108103875A (en) * | 2017-12-13 | 2018-06-01 | 江苏中路工程技术研究院有限公司 | Antiskid crushed stone sealing road surface and its construction method |
| CN108517734A (en) * | 2018-03-05 | 2018-09-11 | 中交公局第五工程有限公司 | Synchronize the smooth coarse asphalt pavement construction method that paves |
| CN109705589A (en) * | 2018-12-27 | 2019-05-03 | 山东高速建设材料有限公司 | It is exclusively used in the high solids content emulsified asphalt and its preparation and construction method of road surface sealing |
-
2020
- 2020-04-13 CN CN202010283800.4A patent/CN111501467B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104233918A (en) * | 2014-09-26 | 2014-12-24 | 南京同安道路工程有限公司 | Large-grain-diameter rubber block-modified asphalt mastic and gravel sealing layer and preparation method thereof |
| CN106948235A (en) * | 2017-04-07 | 2017-07-14 | 北京特希达交通勘察设计院有限公司 | A kind of bituminous paving interlayer construction method |
| CN108103875A (en) * | 2017-12-13 | 2018-06-01 | 江苏中路工程技术研究院有限公司 | Antiskid crushed stone sealing road surface and its construction method |
| CN108517734A (en) * | 2018-03-05 | 2018-09-11 | 中交公局第五工程有限公司 | Synchronize the smooth coarse asphalt pavement construction method that paves |
| CN109705589A (en) * | 2018-12-27 | 2019-05-03 | 山东高速建设材料有限公司 | It is exclusively used in the high solids content emulsified asphalt and its preparation and construction method of road surface sealing |
Non-Patent Citations (1)
| Title |
|---|
| 热压式沥青混凝土路面施工关键控制参数的试验模拟;黄晚清、游宏、陆阳;《公路》;10-15 * |
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