CN107401095B - Polypropylene high-strength geotextile and construction method applying same to pavement - Google Patents
Polypropylene high-strength geotextile and construction method applying same to pavement Download PDFInfo
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- CN107401095B CN107401095B CN201611115058.6A CN201611115058A CN107401095B CN 107401095 B CN107401095 B CN 107401095B CN 201611115058 A CN201611115058 A CN 201611115058A CN 107401095 B CN107401095 B CN 107401095B
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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
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
Abstract
The invention discloses a polypropylene high-strength geotextile, wherein the lower end of a waterproof anti-cracking base fabric is provided with a water permeable groove, and the waterproof anti-cracking base fabric is characterized in thatThe waterproof anti-cracking base fabric is polypropylene soil fiber net geotextile made of HDPE (high-density polyethylene) colloidal particles or PP (polypropylene) colloidal particles, and the construction method applied to the pavement comprises the following steps: s1, tamping the road surface by a tamper; s2, uniformly paving the broken stone on the roadbed, adding the fly ash, pouring the cement, and leveling; s3, paving the waterproof anti-cracking base cloth on the undried roadbed water stabilization layer, and filling asphalt oil in the water permeable grooves; s4, spraying 1.0-1.2Kg/m on the upper end of the paved waterproof and anti-cracking base cloth2The asphalt pavement layer (4); s5, before the asphalt pavement layer is cooled and solidified, spreading a layer of load-bearing granolites; and S6, embedding the load-bearing granolites into the asphalt pavement layer through rolling to form a hardened pavement. The invention has the characteristics of simple structure, good waterproof effect, suitability for alpine regions and the like.
Description
Technical Field
The invention relates to the technical field of geotextile, in particular to polypropylene high-strength geotextile and a construction method thereof applied to a pavement.
Background
Under the promotion of the policy of reformation and opening of geosynthetics in China, although products have certain foundations and scales, the low-level repetition phenomenon is serious, the products are not paid attention to product development and domestic and foreign market investigation, great gaps exist compared with developed countries, the development of various fields is unbalanced, and relevant specifications of some design and construction are not followed up. A complete disciplinary group for raw material, production, manufacture, detection and construction application is not formed in scientific research institutions yet.
Meanwhile, the domestic geosynthetic industry has vague raw material selection, and especially has insufficient understanding on the chemical properties of terylene and polypropylene. The terylene product which is easy to hydrolyze to generate salt under the alkaline condition and gradually loses efficacy is widely applied to alkaline environment, seepage prevention in metallurgy and chemical industry or other environments in direct contact with alkaline substances such as cement lime and the like. The polypropylene fiber is soaked in calcium chloride solution with the pH value of 12.3, and the strength is hardly reduced; the strength of the polyester fiber is reduced by 25% by soaking the polyester fiber in a calcium chloride + 0.03% FeSO4 solution with the pH value of 12.3, so that the direct contact of the polyester fiber with engineering materials is limited, and therefore, a polypropylene high-strength geotextile suitable for alpine regions is provided.
Disclosure of Invention
The invention aims to provide a polypropylene high-strength geotextile to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a polypropylene geotechnique's cloth that excels in, includes waterproof crack control base cloth, the recess that permeates water has been seted up to the lower extreme of waterproof crack control base cloth, waterproof crack control base cloth is the polypropylene earth fibre net geotechnique's cloth of being made by HDPE micelle or PP micelle.
Preferably, waterproof crack control base cloth is used on the road surface, including the road bed, the stable layer of road bed water has been laid to the upper end of road bed, waterproof crack control base cloth has been laid to the upper end of the stable layer of road bed water, the upper end of waterproof crack control base cloth has been paved with the bituminous paving layer, the recess intussuseption that permeates water is filled with asphalt oil, and asphalt oil's lower extreme is connected with the stable layer of road bed water.
Preferably, the roadbed water stabilization layer is formed by mixing cement, fly ash and broken stones, wherein the weight ratio of the cement is 4% -8% of the total weight ratio, the weight ratio of the fly ash is 9% -15% of the total weight ratio, and the broken stones are filled.
The construction method of applying the polypropylene high-strength geotextile to the pavement comprises the following steps:
s1, tamping the road surface by a tamper;
s2, uniformly paving the broken stones on the roadbed, uniformly adding the fly ash, finally pouring the cement, and leveling;
s3, paving the waterproof anti-cracking base cloth on the undried roadbed water stable layer, and filling asphalt oil in the water permeable grooves after the roadbed water stable layer is dried completely;
s4, spraying 1.0-1.2Kg/m on the upper end of the paved waterproof and anti-cracking base cloth2The asphalt pavement layer (4);
s5, before the asphalt pavement layer is cooled and solidified, sprinkling a layer of clean and dustless bearing granolites with uniform grain diameter of 0.8-1.2 cm;
and S6, embedding the load-bearing granolites into the asphalt pavement layer through rolling to form a hardened pavement.
Preferably, the thickness of the asphalt pavement layer is between 3 and 5cm, and the thickness of the waterproof anti-cracking base cloth is between 1 and 1.5 cm.
Preferably, the load-bearing granolites are basalt or granite granolites.
Preferably, the temperature of the asphalt pavement layer is kept between 120 and 140 ℃ during the spraying process.
Compared with the prior art, the invention has the beneficial effects that: the polypropylene high-strength geotextile is particularly suitable for alpine regions, the waterproof anti-cracking base cloth and the asphalt oil form an asphalt composite waterproof layer, the asphalt composite waterproof layer takes the high-strength polypropylene fiber base cloth as a carrier, asphalt permeates into all fine spaces of fibers, the waterproof effect is extremely stable, the composite waterproof layer also has a horizontal drainage function, underground water can be discharged from two horizontal sides after being blocked by the asphalt composite waterproof layer in the upward direction, the water pressure in a road structure is reduced, the important effect is played on the stability of the whole structure, and through two proportioning experiments of sand, gravel and cement as aggregate and fly ash, gravel and cement as aggregate in a roadbed water stabilization layer, the result shows that the cement stabilization mixture doped with fly ash has better workability and is easy to form test blocks Good waterproof effect, and is suitable for high and cold areas.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the construction of the present invention applied to a road surface;
fig. 3 is a schematic side view of the present invention applied to a road surface.
In the figure: 1 roadbed, 2 roadbed water stabilization layers, 3 waterproof anti-cracking base cloth, 31 water permeable grooves, 32 asphalt oil and 4 asphalt pavement layers.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Please refer to FIGS. 1-3
Example 1
A polypropylene high-strength geotextile comprises a waterproof anti-cracking base fabric 3, wherein the lower end of the waterproof anti-cracking base fabric 3 is provided with a water permeable groove 31, and the waterproof anti-cracking base fabric 3 is polypropylene soil fiber net geotextile made of HDPE (high-density polyethylene) colloidal particles or PP (polypropylene) colloidal particles.
On waterproof crack control base cloth 3 was used the road surface, including road bed 1, the stable layer 2 of road bed water has been laid to the upper end of road bed 1, and waterproof crack control base cloth 3 has been laid to the upper end of the stable layer 2 of road bed water, and the upper end of waterproof crack control base cloth 3 has been fully laid asphalt pavement layer 4, and the recess 31 that permeates water is filled with asphalt oil 32, and asphalt oil 32's lower extreme and the stable layer 2 of road bed water are connected.
The roadbed water stabilization layer 2 is formed by mixing cement, fly ash and broken stones, wherein the weight ratio of the cement is 4%, the weight ratio of the fly ash is 9%, and the broken stones are filled.
The construction method of applying the polypropylene high-strength geotextile to the pavement comprises the following steps:
s1, tamping the road surface by a tamper;
s2, uniformly paving the broken stones on the roadbed 1, uniformly adding the fly ash, finally pouring the cement, and leveling;
s3, paving the waterproof and anti-cracking base cloth 3 on the undried roadbed water stabilization layer 2, and filling the asphalt oil 32 in the water permeable groove 31 after the roadbed water stabilization layer 2 is dried completely;
s4, spraying 1.0Kg/m on the upper end of the paved waterproof and anti-cracking base cloth 32 Asphalt pavement layer 4;
s5, before the asphalt pavement layer 4 is cooled and solidified, scattering a layer of clean and dustless bearing granolites with uniform grain diameter and thickness of 0.8 cm;
and S6, embedding the load-bearing granolites into the asphalt pavement layer 4 through rolling to form a hardened pavement.
The thickness of the asphalt pavement layer 4 is between 3cm, and the thickness of the waterproof and anti-cracking base cloth 3 is between 1 cm.
The bearing granolites are basalt or granite granolites.
The temperature of the asphalt pavement layer 4 is maintained at 120 ℃ during the spraying process.
Example 2
A polypropylene high-strength geotextile comprises a waterproof anti-cracking base fabric 3, wherein the lower end of the waterproof anti-cracking base fabric 3 is provided with a water permeable groove 31, and the waterproof anti-cracking base fabric 3 is polypropylene soil fiber net geotextile made of HDPE (high-density polyethylene) colloidal particles or PP (polypropylene) colloidal particles.
On waterproof crack control base cloth 3 was used the road surface, including road bed 1, the stable layer 2 of road bed water has been laid to the upper end of road bed 1, and waterproof crack control base cloth 3 has been laid to the upper end of the stable layer 2 of road bed water, and the upper end of waterproof crack control base cloth 3 has been fully laid asphalt pavement layer 4, and the recess 31 that permeates water is filled with asphalt oil 32, and asphalt oil 32's lower extreme and the stable layer 2 of road bed water are connected.
The roadbed water stabilization layer 2 is formed by mixing cement, fly ash and broken stones, wherein the weight ratio of the cement is 6%, the weight ratio of the fly ash is 12%, and the broken stones are filled.
The construction method of applying the polypropylene high-strength geotextile to the pavement comprises the following steps:
s1, tamping the road surface by a tamper;
s2, uniformly paving the broken stones on the roadbed 1, uniformly adding the fly ash, finally pouring the cement, and leveling;
s3, paving the waterproof and anti-cracking base cloth 3 on the undried roadbed water stabilization layer 2, and filling the asphalt oil 32 in the water permeable groove 31 after the roadbed water stabilization layer 2 is dried completely;
s4, spraying 1.1Kg/m on the upper end of the paved waterproof and anti-cracking base cloth 32 Asphalt pavement layer 4;
s5, before the asphalt pavement layer 4 is cooled and solidified, scattering a layer of clean and dustless bearing granolites with uniform grain size and thickness of 1 cm;
and S6, embedding the load-bearing granolites into the asphalt pavement layer 4 through rolling to form a hardened pavement.
The thickness of the asphalt pavement layer 4 is between 4cm, and the thickness of the waterproof and anti-cracking base cloth 3 is between 1.2 cm.
The bearing granolites are basalt or granite granolites.
The temperature of the asphalt pavement layer 4 is maintained at 130 c during the spraying process.
Example 3
A polypropylene high-strength geotextile comprises a waterproof anti-cracking base fabric 3, wherein the lower end of the waterproof anti-cracking base fabric 3 is provided with a water permeable groove 31, and the waterproof anti-cracking base fabric 3 is polypropylene soil fiber net geotextile made of HDPE (high-density polyethylene) colloidal particles or PP (polypropylene) colloidal particles.
On waterproof crack control base cloth 3 was used the road surface, including road bed 1, the stable layer 2 of road bed water has been laid to the upper end of road bed 1, and waterproof crack control base cloth 3 has been laid to the upper end of the stable layer 2 of road bed water, and the upper end of waterproof crack control base cloth 3 has been fully laid asphalt pavement layer 4, and the recess 31 that permeates water is filled with asphalt oil 32, and asphalt oil 32's lower extreme and the stable layer 2 of road bed water are connected.
The roadbed water stabilization layer 2 is formed by mixing cement, fly ash and broken stones, wherein the weight ratio of the cement accounts for 8 percent of the total weight, the weight ratio of the fly ash accounts for 15 percent of the total weight, and the broken stones are filled.
The construction method of applying the polypropylene high-strength geotextile to the pavement comprises the following steps:
s1, tamping the road surface by a tamper;
s2, uniformly paving the broken stones on the roadbed 1, uniformly adding the fly ash, finally pouring the cement, and leveling;
s3, paving the waterproof and anti-cracking base cloth 3 on the undried roadbed water stabilization layer 2, and filling the asphalt oil 32 in the water permeable groove 31 after the roadbed water stabilization layer 2 is dried completely;
s4, spraying 1.2Kg/m on the upper end of the paved waterproof and anti-cracking base cloth 32 Asphalt pavement layer 4;
s5, before the asphalt pavement layer 4 is cooled and solidified, scattering a layer of clean and dustless bearing granolites with uniform grain size and thickness of 1.2 cm;
and S6, embedding the load-bearing granolites into the asphalt pavement layer 4 through rolling to form a hardened pavement.
The thickness of the asphalt pavement layer 4 is between 5cm, and the thickness of the waterproof and anti-cracking base cloth 3 is between 1.5 cm.
The bearing granolites are basalt or granite granolites.
The temperature of the asphalt pavement layer 4 is maintained at 140 ℃ during the spraying process.
Example 4
Freezing and thawing experiment of roadbed water stable layer 2 structure:
experimental groups: mixing the components of the roadbed water stable layer 2 in the embodiment 1 to prepare an experimental water stable layer, cooling and solidifying for 15 days at the temperature of 10 ℃, and cutting 5 blocks with the length, width and height of 10cm by using a cutting machine;
control group: the aggregate is sand, gravel and cement according to the proportion in the embodiment 1, the fly ash is changed into sand to prepare a contrast water stable layer, the contrast water stable layer is prepared, cooled and solidified for 15 days at the temperature of 10 ℃, and 5 blocks with the length, width and height of 10cm x 10cm are cut by a cutting machine;
freeze-thaw experiments: putting the experimental group and the control group into a freeze-thaw tester with the same specification, starting the freeze-thaw tester, reducing the temperature to-15 ℃, keeping the temperature for 2 hours, then increasing the temperature to 6 ℃, keeping the temperature for 2 hours, taking out and applying pressure to the experimental group and the control group until cracking, respectively freezing and thawing the rest experimental group and the control group for 2, 3, 4 and 5 times according to the experimental method, and then applying pressure to the experimental group and the control group to obtain the following table:
TABLE 1
| Freeze thawing for 1 time | Freeze thawing for 2 times | Freeze thawing for 3 times | Freeze thawing for 4 times | Freeze thawing for 5 times | |
| Experimental group | 617KPa | 603KPa | 597KPa | 589KPa | 571KPa |
| Control group | 504KPa | 428KPa | 346KPa | 307KPa | 273KPa |
From the above table, it can be seen that: from the above table, the bearing pressure of the experimental group is not changed greatly along with the increase of the freeze-thaw times, the bearing pressure of the comparison group is reduced sharply along with the increase of the freeze-thaw times, and through two proportioning experiments of taking sand, gravel and cement as the aggregate and taking fly ash, gravel and cement as the aggregate to the roadbed water stabilization layer (2), the result shows that the cement stabilization mixture doped with fly ash has better workability, stable structure and easy molding of a test block.
The same results as in example 1 were obtained by conducting the above experiments according to the procedures of example 2 and example 3.
Example 5
Waterproof and anti-cracking bearing experiment of applying polypropylene high-strength geotextile to road surface
Experimental groups: preparing a pavement according to the pavement construction method in the embodiment 1, and naturally solidifying for 15 days;
control group: according to the pavement construction method in the embodiment 1, the asphalt composite waterproof layer is removed, the polyester fiber waterproof layer with the same thickness is added, and the mixture is naturally solidified for 15 days;
the experimental and control groups were then soaked in an alkaline environment for 5h and then tested for their bearing capacity, giving the following table.
TABLE 2
| Ph＝9.5 | Ph＝10.5 | Ph＝11.5 | Ph＝12.5 | |
| Experimental group | 638KPa | 611KPa | 586KPa | 562KPa |
| Control group | 597KPa | 506KPa | 438KPa | 371KPa |
From table 2, it can be seen: the strength of the experimental group is slightly reduced along with the increase of alkalinity, and the strength of the comparison group is obviously reduced along with the increase of alkalinity, so that the polypropylene geotextile is more practical to apply on roads, is not easy to be subjected to the alkaline environment, has reduced strength and stronger durability.
The same results as in example 1 were obtained by conducting the above experiments according to the procedures of example 2 and example 3.
The polypropylene high-strength geotextile, the waterproof anti-cracking base cloth 3 and the asphalt oil 32 form an asphalt composite waterproof layer, because the asphalt composite waterproof layer takes the polypropylene fiber base cloth with high strength as a carrier, the asphalt permeates into the fine space of the fiber, the waterproof effect is extremely stable, the composite waterproof layer also has a horizontal drainage function, underground water can be drained from two horizontal sides after being blocked by the asphalt composite waterproof layer in the upward direction, the water pressure in the road structure is reduced, plays an important role in stabilizing the whole structure, and through two proportioning experiments of taking sand, gravel and cement as aggregates and taking fly ash, gravel and cement as aggregates for the roadbed water stabilization layer 2, the result shows that the cement stabilization mixture doped with fly ash not only has better workability, the test block is easy to form, and the invention has the characteristics of simple structure, good waterproof effect, and is particularly suitable for alpine regions. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The construction method of applying the polypropylene high-strength geotextile to the pavement comprises a waterproof anti-cracking base fabric (3), and is characterized in that: the waterproof and anti-cracking base cloth is characterized in that a water permeable groove (31) is formed in the lower end of the waterproof and anti-cracking base cloth (3), the waterproof and anti-cracking base cloth (3) is polypropylene soil net geotextile made of HDPE (high-density polyethylene) colloidal particles or PP (polypropylene) colloidal particles, the waterproof and anti-cracking base cloth (3) is applied to a road surface and comprises a roadbed (1), a roadbed water stabilizing layer (2) is laid at the upper end of the roadbed (1), the waterproof and anti-cracking base cloth (3) is laid at the upper end of the roadbed water stabilizing layer (2), an asphalt pavement layer (4) is fully laid at the upper end of the waterproof and anti-cracking base cloth (3), asphalt oil (32) is filled in the water permeable groove (31), the lower end of the asphalt oil (32) is connected with the roadbed water stabilizing layer (2), the roadbed water stabilizing layer (2) is formed by mixing cement, fly ash and crushed stone, the weight ratio of the cement is 4, the method is characterized by comprising the following steps of filling broken stones, wherein the thickness of the asphalt pavement layer (4) is 3-5cm, and the thickness of the waterproof anti-cracking base cloth (3) is 1-1.5 cm:
s1, tamping the road surface by a tamper;
s2, uniformly paving the broken stones on the roadbed (1), uniformly adding the fly ash, and finally pouring cement for leveling;
s3, paving the waterproof and anti-cracking base cloth (3) on the undried roadbed water stabilization layer (2), and filling asphalt oil (32) in the water permeable groove (31) after the roadbed water stabilization layer (2) is dried completely;
s4, spraying 1.0-1.2Kg/m on the upper end of the paved waterproof and anti-cracking base cloth (3)2The asphalt pavement layer (4);
s5, before the asphalt pavement layer (4) is not cooled and solidified, sprinkling a layer of clean and dustless load-bearing granules with uniform grain diameter and thickness of 0.8-1.2 cm;
s6, embedding the load-bearing granolites into the asphalt pavement layer (4) through rolling to form a hardened pavement.
2. The construction method of applying the polypropylene high-strength geotextile to a pavement according to claim 1, which is characterized in that: the bearing granolites are basalt or granite granolites.
3. The construction method of applying the polypropylene high-strength geotextile to a pavement according to claim 1, which is characterized in that: the temperature of the asphalt pavement layer (4) is kept between 120 and 140 ℃ in the spraying process.
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Citations (4)
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|---|---|---|---|---|
| CN2442835Y (en) * | 2000-08-15 | 2001-08-15 | 张守彬 | Multi-layer high-molecular water-proof rolled material |
| CN1411525A (en) * | 1999-12-17 | 2003-04-16 | 三井化学株式会社 | Road reinforcing sheet, structure of asphalt reinforced pavement and method for paving road |
| CN101649592A (en) * | 2009-09-07 | 2010-02-17 | 北京仁创科技集团有限公司 | Road drainage system |
| KR20130064192A (en) * | 2011-12-08 | 2013-06-18 | 김철각 | Road pavement methods and structure of using stone basket |
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2016
- 2016-12-07 CN CN201611115058.6A patent/CN107401095B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1411525A (en) * | 1999-12-17 | 2003-04-16 | 三井化学株式会社 | Road reinforcing sheet, structure of asphalt reinforced pavement and method for paving road |
| CN2442835Y (en) * | 2000-08-15 | 2001-08-15 | 张守彬 | Multi-layer high-molecular water-proof rolled material |
| CN101649592A (en) * | 2009-09-07 | 2010-02-17 | 北京仁创科技集团有限公司 | Road drainage system |
| KR20130064192A (en) * | 2011-12-08 | 2013-06-18 | 김철각 | Road pavement methods and structure of using stone basket |
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