CN113250031A - On-site rapid regeneration and repair method for semi-rigid base disease of asphalt pavement - Google Patents
On-site rapid regeneration and repair method for semi-rigid base disease of asphalt pavement Download PDFInfo
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- CN113250031A CN113250031A CN202110612139.1A CN202110612139A CN113250031A CN 113250031 A CN113250031 A CN 113250031A CN 202110612139 A CN202110612139 A CN 202110612139A CN 113250031 A CN113250031 A CN 113250031A
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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
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/187—Repairing bituminous covers, e.g. regeneration of the covering material in situ, application of a new bituminous topping
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
- Road Repair (AREA)
Abstract
The invention discloses a method for rapidly regenerating and repairing a semi-rigid base layer disease of an asphalt pavement on site. The method comprises the following steps: 1) determining a treatment range, breaking the whole surface layer and the whole base layer, and crushing the whole surface layer and the whole base layer by crushing equipment to produce backfill granules; 2) mixing the granules with emulsified asphalt; 3) spraying an interface adhesive on an excavation interface; 4) paving the stirred granules back to the damaged part, leveling and rolling to form a large-gap emulsified asphalt mixture; 5) filling geopolymer or rapid hardening cement slurry into the gaps of the backfill material; 6) and paving an asphalt surface layer and opening traffic after the curing time is reached. The repairing method is simple and rapid, has small traffic influence, and is energy-saving and environment-friendly. The semi-flexible composite material with the elasticity modulus equivalent to that of the semi-rigid base layer of the original pavement is obtained by recycling the original pavement material on site, and is bonded with the original pavement material through an interface chemical reaction, so that the service life is prolonged.
Description
Technical Field
The invention relates to a method for rapidly regenerating and repairing a semi-rigid base layer disease of an asphalt pavement on site.
Background
At present, over 80% of asphalt pavement base course and subbase course in China adopt semi-rigid materials. Although the semi-rigid base layer has high strength and bearing capacity, the strength and modulus of the semi-rigid base layer gradually attenuate due to fatigue under the action of dry and wet cycles, freeze-thaw cycles and repeated loads in the using process. Due to its inherent disadvantages, localized damage to the semi-rigid substrate is inevitable and prone to multiple occurrences, while repair strategies in actual maintenance management are not numerous. The repair is usually done by excavation, i.e. removing the damaged loose base and sub-base, and after finishing the bedding, re-laying the base and top layers. According to the maintenance method, on one hand, the original pavement material is abandoned and cannot be reused, and then new materials are paved, so that the maintenance cost is high; on the other hand, the laying of a new semi-rigid base material needs long-time maintenance, which causes traffic jam and even traffic safety accidents.
In order to reduce the influence of construction on traffic and society, there are construction units which adopt materials such as quick-hardening and quick-setting concrete or poor concrete for repair. However, the repair material has poor adhesion to the original semi-rigid substrate and the interface is prone to release under vehicle loading, thereby causing sagging of the repair substrate and the facing. In addition, the elastic modulus of the material is much larger than that of the original base material, which may cause transverse fracture of the repair structure itself, and further cause damage to the surface layer, such as cracking and breaking. Therefore, a maintenance method which is simple, has little influence on traffic, realizes the field recycling of the original pavement materials and has excellent quality is necessary and urgent.
Disclosure of Invention
The invention aims to solve the technical problems that aiming at the defects in the prior art, the invention provides a method for quickly repairing the semi-rigid base diseases of the asphalt pavement, so that the diseases of the asphalt pavement are quickly repaired, and the traffic is quickly opened; the semi-flexible repairing material with the elasticity modulus equivalent to that of the semi-rigid base layer of the original pavement is obtained by recycling the original pavement material, and is bonded with the original pavement material through an interface chemical reaction, so that the integrity of the pavement structure is ensured.
The invention discloses a method for quickly repairing semi-rigid base diseases of an asphalt pavement, which comprises the following steps:
step 1, determining a treatment range according to the disease investigation condition of the asphalt pavement; breaking a base asphalt surface layer and a semi-rigid base layer by using a gun head excavator, and putting a pavement material into a crusher by using the excavator to produce granules with the maximum particle size not larger than d;
step 2, putting the crushed granules into a horizontal concrete mixer, adding emulsified asphalt and mixing;
step 3, spraying an interface adhesive at the excavation interface by using a handheld spraying device;
and 4, paving the granules wrapped by the emulsified asphalt in the step 2 to a damaged position, leveling and rolling to form a large-gap emulsified asphalt mixture.
And 5, mixing geopolymer slurry or quick-hardening cement slurry according to the designed mixing proportion by using a pulping machine. And (4) conveying the mixed slurry to a disease part by using a slurry pump, and filling the slurry into gaps of a backfill material.
And 6, after the curing time is up, spraying emulsified asphalt and paving an asphalt surface layer.
In the step 1, the maximum particle diameter d of the crushed granules is less than or equal to 37.5 mm.
The emulsified asphalt is SBS modified emulsified asphalt, the adding amount of the SBS modified emulsified asphalt is 2-5% of the total mass of the granules, and the mixing time is 3-5 min.
The interface adhesive is sodium water glass solution or potassium water glass solution, the modulus is 1.2-2.0, and the spraying amount is 0.6-0.9 Kg/m2。
In the step 4, a road roller of 10t is adopted for rolling, and the rolling times are 3-5 times.
The geopolymer slurry or the rapid hardening cement slurry has the compression resistance of not less than 10MPa within 2 hours, the fluidity of 14-20 s and the initial setting time of 15-30 min; the grout is poured to fill the backfill material surface and ensure that the exposed stone portion of the surface is not less than 1/2 of the volume.
The health preserving time is not more than 3 h.
For the maintenance of the semi-rigid base layer of the asphalt road, the conventional maintenance method has high maintenance cost, complex process, large traffic influence and no environmental protection. The main advantages of the invention are:
(1) the new material aggregate paved after excavation completely utilizes the semi-rigid base layer and the asphalt surface layer material after the original pavement is crushed, and the on-site recycling of the original pavement material is realized without using new stone. The method is energy-saving and environment-friendly, and is beneficial to realizing the national 'carbon neutralization and carbon peak reaching' goal.
(2) Mixing the crushed stone with emulsified asphalt, wrapping the surface with asphalt, backfilling the excavated disease to form a large-gap emulsified asphalt mixture, and pouring geopolymer or rapid hardening cement slurry to form a semi-flexible base layer. Compared with materials such as cement concrete and the like, the elastic modulus of the material is greatly smaller, and the compressive strength is about 5-10 MPa and is close to that of a semi-rigid base layer. The problems of fracture and the like of the repair material in the later period can not be caused due to the modulus difference.
(3) In order to increase the bonding force of the repairing material and the original pavement semi-rigid base layer at the interface, an interface bonding agent alkaline water glass solution is sprayed at the interface before the paving material is paved. The material can excite the active silicon-aluminum-based substances such as SiO contained in the stone, cement, sandy soil and the like in the backfill material and the original pavement material2、Al2O3And chemical reaction is carried out, so that the new material is bonded with the original pavement at the interface through a chemical bond, and the interface is prevented from cracking and peeling in the traditional maintenance method.
(4) The construction method is simple, links such as material transportation, mixing in a mixing station and the like are omitted, the materials are directly mixed on the road in the construction site, and the construction time and the cost are saved. And the geopolymer and the rapid-hardening cement material can quickly form strength, so that long-time health maintenance of the traditional material is avoided, and the influence on traffic caused by road maintenance is reduced to the maximum extent.
Drawings
FIG. 1 is a flow chart of the method for rapidly repairing the semi-rigid base damage of the asphalt pavement.
Detailed Description
The present invention is further illustrated by the following detailed description, which is to be construed as merely illustrative and not limitative of the remainder of the disclosure, and modifications and variations such as those ordinarily skilled in the art are intended to be included within the scope of the present invention as defined in the appended claims.
As shown in figure 1, the on-site rapid regeneration and repair method for the semi-rigid base layer diseases of the asphalt pavement comprises the following steps:
(1) and determining the treatment range according to the disease investigation condition of the asphalt pavement. Breaking a base asphalt surface layer and a semi-rigid base layer by using a gun head excavator, and putting a pavement material into a crusher by using the excavator to ensure that the maximum particle size of crushed aggregates is not more than 37.5 mm;
(2) putting the crushed granules into a horizontal concrete mixer, adding emulsified asphalt accounting for 5 percent of the total mass of the granules by an emulsified asphalt distributor, and forcibly mixing for 5 min;
(3) spraying sodium water glass solution with the modulus of 1.5 at the excavation interface by using a handheld spraying device, wherein the spraying amount is 0.8Kg/m2And the spraying is ensured to be even; the spraying amount is too small to play a role in bonding, and the spraying amount is too large to increase the construction cost.
(4) And (4) paving the granules wrapped by the emulsified asphalt in the step (2) to the position of the disease, and leveling. And then, rolling for 3-5 times by using a 10t road roller to form a large-gap emulsified asphalt mixture with the void ratio of more than 20%.
(5) And (4) mixing the quick-hardening cement slurry according to the designed mixing proportion by using a pulping machine. And (4) conveying the mixed slurry to a damaged part by using a slurry pump, and filling the slurry into gaps of the backfill material. The grout is poured to fill the backfill material surface and ensure that the stone on the outermost surface exposes 1/2 of its volume. After the slurry is solidified, a semi-flexible base layer is formed.
(6) And after the slurry is poured for 2 hours, spraying emulsified asphalt on the surface of the slurry, backfilling a surface layer asphalt mixture, and opening traffic when the temperature of the pavement is reduced to 50 ℃.
Claims (6)
1. The method for quickly repairing the semi-rigid base damage of the asphalt pavement comprises the following steps:
step 1, determining a treatment range according to the disease investigation condition of the asphalt pavement; breaking the base asphalt surface layer and the semi-rigid base layer, and breaking the pavement material to produce granules with the maximum particle size not greater than d;
step 2, adding emulsified asphalt into the crushed granules and stirring to obtain granules wrapped by the emulsified asphalt;
step 3, spraying an interface adhesive on the excavation interface;
step 4, paving the granules wrapped by the emulsified asphalt in the step 2 to a damaged position, leveling and rolling to form a large-gap emulsified asphalt mixture;
step 5, mixing geopolymer slurry or quick-hardening cement slurry according to a designed mixing ratio by using a pulping machine; conveying the mixed slurry to a disease part by using a slurry pump, and filling the slurry into gaps of a backfill material;
and 6, after the curing time is up, spraying emulsified asphalt and paving an asphalt surface layer.
2. The method for rapidly repairing the semi-rigid base layer disease of the asphalt pavement according to claim 1, which is characterized by comprising the following steps: the maximum particle size d of the crushed granules is less than or equal to 37.5 mm.
3. The method for rapidly repairing the semi-rigid base layer disease of the asphalt pavement according to claim 1, which is characterized by comprising the following steps: the emulsified asphalt is SBS modified emulsified asphalt, the adding amount of the SBS modified emulsified asphalt is 2-5% of the total mass of the granules, and the mixing time is 3-5 min.
4. The method for rapidly repairing the semi-rigid base layer disease of the asphalt pavement according to claim 1, which is characterized by comprising the following steps: the interface adhesive is sodium water glass solution or potassium water glass solution, the modulus is 1.2-2.0, and the spraying amount is 0.6-0.9 Kg/m2。
5. The method for rapidly repairing the semi-rigid base layer disease of the asphalt pavement according to claim 1, which is characterized by comprising the following steps: the geopolymer slurry or the rapid hardening cement slurry has the compression resistance of not less than 10MPa within 2 hours, the fluidity of 14-20 s and the initial setting time of 15-30 min.
6. The method for rapidly repairing the semi-rigid base layer disease of the asphalt pavement according to claim 1, which is characterized by comprising the following steps: the health preserving time is not more than 3 h.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110612139.1A CN113250031A (en) | 2021-06-02 | 2021-06-02 | On-site rapid regeneration and repair method for semi-rigid base disease of asphalt pavement |
| PCT/CN2021/135554 WO2022252531A1 (en) | 2021-06-02 | 2021-12-03 | On-site rapid regeneration and repair method for damage for semi-rigid base of asphalt pavement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110612139.1A CN113250031A (en) | 2021-06-02 | 2021-06-02 | On-site rapid regeneration and repair method for semi-rigid base disease of asphalt pavement |
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| Publication Number | Publication Date |
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| CN113250031A true CN113250031A (en) | 2021-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110612139.1A Pending CN113250031A (en) | 2021-06-02 | 2021-06-02 | On-site rapid regeneration and repair method for semi-rigid base disease of asphalt pavement |
Country Status (2)
| Country | Link |
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| CN (1) | CN113250031A (en) |
| WO (1) | WO2022252531A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022252531A1 (en) * | 2021-06-02 | 2022-12-08 | 英达热再生有限公司 | On-site rapid regeneration and repair method for damage for semi-rigid base of asphalt pavement |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115748354A (en) * | 2022-12-19 | 2023-03-07 | 河南城建学院 | Design method for combination of inverted semi-rigid base asphalt pavement structural layers |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1125799A (en) * | 1994-12-31 | 1996-07-03 | 王远华 | Quick road-building agent and its preparation method and usage |
| KR20070095661A (en) * | 2006-03-22 | 2007-10-01 | 주식회사 스페이스 | Hybrid paving materials and method for paving of road |
| AU2009101336A4 (en) * | 2009-12-22 | 2010-02-25 | Jiangxi Ganyue Expressway Co Ltd | Cold-recycling emulsified asphalt mixture and method for pavement reconstruction |
| CN102677567B (en) * | 2012-05-03 | 2014-12-31 | 华南理工大学 | Asphalt pavement structure regenerated from concrete pavement and construction method of asphalt pavement structure |
| CN104762861A (en) * | 2015-03-23 | 2015-07-08 | 华南理工大学 | Semi-flexible pavement based on cold-recycling base of bituminous pavement and construction method of semi-flexible pavement |
| CN205329451U (en) * | 2015-12-08 | 2016-06-22 | 上海颖川佳固信息工程股份有限公司 | Foamed asphalt cold in -place recycling mixture pavement |
| CN108409214A (en) * | 2018-03-28 | 2018-08-17 | 平顶山市公路交通勘察设计院 | A kind of ground polymers injecting paste material and preparation method thereof |
| CN109797624B (en) * | 2019-01-17 | 2020-12-08 | 上海力阳道路加固科技股份有限公司 | Semi-flexible modified geopolymer lower seal material for road and construction method thereof |
| CN111636282A (en) * | 2020-07-13 | 2020-09-08 | 长安大学 | Method for implementing pavement maintenance based on in-situ softening technology of semi-rigid pavement base |
| CN113250031A (en) * | 2021-06-02 | 2021-08-13 | 英达热再生有限公司 | On-site rapid regeneration and repair method for semi-rigid base disease of asphalt pavement |
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2021
- 2021-06-02 CN CN202110612139.1A patent/CN113250031A/en active Pending
- 2021-12-03 WO PCT/CN2021/135554 patent/WO2022252531A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022252531A1 (en) * | 2021-06-02 | 2022-12-08 | 英达热再生有限公司 | On-site rapid regeneration and repair method for damage for semi-rigid base of asphalt pavement |
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| WO2022252531A1 (en) | 2022-12-08 |
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