CN101323512A - Method for avoiding asphalt pavement reflection crack - Google Patents
Method for avoiding asphalt pavement reflection crack Download PDFInfo
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- CN101323512A CN101323512A CNA2008100227522A CN200810022752A CN101323512A CN 101323512 A CN101323512 A CN 101323512A CN A2008100227522 A CNA2008100227522 A CN A2008100227522A CN 200810022752 A CN200810022752 A CN 200810022752A CN 101323512 A CN101323512 A CN 101323512A
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- cement
- asphalt
- stabilized macadam
- foundation material
- broken stone
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Abstract
A method used for preventing referencion cracks of asphalt pavements is an improvement to the semi-rigid cement stabilized macadam foundation material and is characterized in that 2.2 to 2.8wt percent of emulsified asphalt is added into the cement stabilized macadam foundation material according to the matched macadam quantity, or simultaneously the 3.0 to 3.5 wt percent of cement use level is reduced. The cement-emulsified asphalt stabilized macadam foundation material is successfully applied to constructions and the foundation material can effectively prevent the referencion cracks of asphalt pavement so as to largely save maintaining cost and prolong service life.
Description
One, technical field
The present invention relates to a kind of raising road construction method for quality, particularly improve the method for asphalt road construction quality, specifically a kind of method of preventing and treating asphalt pavement reflective cracking.
Two, background technology
The highway of bituminous pavement accounts for more than 80% of highway in China total kilometrage.Bituminous pavement generally has early disease, just occurs diseases such as crack, hole groove after many newly-built road surfaces were open to traffic 2～3 years, and transformation needs repairing.Its one of the main reasons is generally to adopt semi-rigid sub-base material under the oil mat, does basic unit as cement stabilized macadam (the steady rubble of water), lime fly ash rubble (two-ash broken stones) etc.Semi-rigid type base is the main level that bears tensile stress fatigue, be characterized in that tensile strength is much smaller than ultimate compression strength, drying shrinkage, temperature contract and the acting in conjunction of load fatigue effect under make base course crack, cause the oil mat cracking on the correspondence position, form reflection crack, especially remarkable to the thin person's influence of brea bed.
The external flexbile base that uses with the control reflection crack more.
China generally is that improvement by semi-rigid type base is with the control reflection crack.For example, the interpolation WS high-efficient retarder (" Guangxi transport science and techonologies " the 4th phase in 2003) in base material that has.What have adds fiber (" highway communication science and technology " the 3rd phase in 2006) at base material.By pass through to aggregate grading form, percentage of water loss, exposure duration etc. control (" highway communication science and technology " the 4th phase in 2006).The steady crushed rock base course of use framework compact water that has (" engineering construction and design " the 9th phase in 2005)." East China highway " the 2nd phase in 2006 discloses a kind of new departure of preventing and treating the semi-rigid type base reflection crack, reduce cement consumption to 2.5% (conventional amount used 4～6%) in the steady rubble material of water on the one hand, add 1.8% emulsified bitumen simultaneously, this scheme shows at the contrast highway section comparative result of 1.5km test road and 500m, its rebound deflection has increase, also have to reduce, but typical value difference is little, just the deviation of test section is less; Its modulus of resilience test section comparison is low according to the highway section; Basic unit's desciccation crack is observed and is shown, the contrast highway section has more than ten, and the test section still has three.
Three, summary of the invention
The present invention is intended to prevent and treat cover bituminous reflection crack on the steady crushed rock base course of semi-rigid water, and technical problem to be solved is to make base material both keep certain intensity, and flexibility and non-deformability are preferably arranged again.
In the steady macadam base material of water, the rubble of grating is a framework material, and cement is stablizer, mainly works to form ultimate compression strength.The present invention improves the steady macadam base material of water, its technical scheme is 2.2～2.8wt% (mass percent of adding the graded broken stone amount under the constant prerequisite of graded broken stone and cement consumption, emulsified bitumen down together), described emulsified bitumen is the emulsified bitumen of asphalt content 40～60wt%.
Further improved technical scheme is under the constant prerequisite of graded broken stone, reduces the 3.0～3.5wt% of cement consumption to the graded broken stone amount, and the asphalt content of adding 2.2～2.8wt% of graded broken stone amount simultaneously is the emulsified bitumen of 40～60wt%.
Preferred cement consumption 3.0wt%, emulsified bitumen consumption 2.2～2.5wt%.
This Cement-Emulsified Asphalt stabilization gravel material has been successfully applied to engineering practice, and total kilometrage reaches more than 40 kilometer.The 1000 meters road reflection Number of Fractures of statistics after half a year that are open to traffic, the bituminous pavement that does not use this material to do basic unit has 61 cracks, and the asphalt pavement crack number that uses this material to do basic unit is 0; Through adding up after half a year, the former increases to 91 again, and rate of increase reaches 62.3%, and the latter only has 3.As seen use this material to save maintenance cost greatly, increase the service life.
Further detection to basic unit shows, suitably reduces cement consumption, and remaining basically stable of its ultimate compression strength and conventional amount reaches 2.29MPa, and it is about 73% that the deformation when destroying does not add the increase of emulsified bitumen, shows that it has flexibility and ability of anti-deformation preferably.Its combined effect is embodied in the reflection crack of effective control bituminous pavement.
Add dispersing uniformity and the construction that has improved base material behind a small amount of emulsified bitumen in addition and be property.
Four, embodiment
With the rubble is benchmark, the material of percentage composition proportioning by weight.
The rubble grading limit
| Size of mesh (mm) | 31.5 | 26.5 | 19.0 | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 |
| Percent of pass (%) | 100 | 90～100 | 72～89 | 47～67 | 29～49 | 17～35 | 8～22 | 0～7 |
Rubble carries out grading composition, satisfies current specifications " highway road surface construction technique normalizing " related request (JTJ034-2000).
The technical indicator of rubble, by current specifications " highway engineering gather materials testing regulation " (JTGE42-2005) correlation method carry out, mainly comprise: crush values, apparent density, bituminous adhesion, silt content, sand equivalent.
The technical indicator of cement is undertaken, is mainly comprised by current specifications " highway engineering cement and cement concrete testing regulation " (JTG E30-2005) correlation method: time of coagulation, intensity.
The technical indicator of emulsified bitumen by current specifications " highway engineering asphalt testing regulation " (JTJ052-2000) correlation method carry out, mainly comprise: residual content on the sieve, de-emulsification speed, evaporation residue content, with the adhesion of rubble, mix and stir test, electric charge.
The Cement-Emulsified Asphalt stabilized macadam base material is formed:
Rubble: 100wt%; Emulsified bitumen (asphalt content 40～60%): 2.2wt%, 2.5wt%, 2.8wt%; Cement: 3.0wt%, 3.2wt%, 3.5wt%; Add water: 2.8wt%, 3.2wt%, 3.5wt%.
Rubble, emulsified bitumen, cement, the water of grading composition are made up the back mixing by above arbitrary percentage and mixes and stirs, and the compound that mixes and stirs promptly is the Cement-Emulsified Asphalt stabilized macadam base material.
Claims (3)
1, a kind of method of preventing and treating asphalt pavement reflective cracking, be that semi-rigid cement stabilized macadam base material is improved, it is characterized in that: the asphalt content that adds 2.2～2.8wt% of graded broken stone amount in cement stabilized macadam base material is the emulsified bitumen of 40～60wt%.
2, method according to claim 1 is characterized in that: the asphalt content of 2.2～2.8wt% of the cement of 3.0～3.5wt% of adding graded broken stone amount and graded broken stone amount is the emulsified bitumen of 40～60wt% in the cement stabilized macadam material.
3, method according to claim 2 is characterized in that: the asphalt content of 2.2～2.5wt% of the cement of the 3.0wt% of adding graded broken stone amount and graded broken stone amount is the emulsified bitumen of 50wt% in cement stabilized macadam base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100227522A CN101323512A (en) | 2008-07-10 | 2008-07-10 | Method for avoiding asphalt pavement reflection crack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100227522A CN101323512A (en) | 2008-07-10 | 2008-07-10 | Method for avoiding asphalt pavement reflection crack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101323512A true CN101323512A (en) | 2008-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100227522A Pending CN101323512A (en) | 2008-07-10 | 2008-07-10 | Method for avoiding asphalt pavement reflection crack |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320861A (en) * | 2011-06-10 | 2012-01-18 | 刘建平 | The working method of glued healing crack stone material |
| CN102503258A (en) * | 2011-10-15 | 2012-06-20 | 交通运输部公路科学研究所 | High-intensity low-crack cement-stabilized graded macadam and preparation method thereof |
| CN103224351A (en) * | 2013-05-13 | 2013-07-31 | 东南大学 | Anti-fatigue type cement stabilized gravel |
| CN105198316A (en) * | 2015-09-17 | 2015-12-30 | 同济大学 | Emulsified asphalt cement stabilized macadam |
| CN105801058A (en) * | 2016-06-03 | 2016-07-27 | 江苏东交工程设计顾问有限公司 | Durable rapid repair material for pavement around inspection well and preparation and detection method of durable rapid repair material for pavement around inspection well |
| CN106431140A (en) * | 2016-09-22 | 2017-02-22 | 广东华路交通科技有限公司 | Novel roller compacted concrete base material and preparation method thereof |
-
2008
- 2008-07-10 CN CNA2008100227522A patent/CN101323512A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320861A (en) * | 2011-06-10 | 2012-01-18 | 刘建平 | The working method of glued healing crack stone material |
| CN102320861B (en) * | 2011-06-10 | 2013-01-02 | 刘建平 | Method for producing cementation healing fussure stone |
| CN102503258A (en) * | 2011-10-15 | 2012-06-20 | 交通运输部公路科学研究所 | High-intensity low-crack cement-stabilized graded macadam and preparation method thereof |
| CN102503258B (en) * | 2011-10-15 | 2013-03-27 | 交通运输部公路科学研究所 | High-intensity low-crack cement-stabilized graded macadam and preparation method thereof |
| CN103224351A (en) * | 2013-05-13 | 2013-07-31 | 东南大学 | Anti-fatigue type cement stabilized gravel |
| CN105198316A (en) * | 2015-09-17 | 2015-12-30 | 同济大学 | Emulsified asphalt cement stabilized macadam |
| CN105801058A (en) * | 2016-06-03 | 2016-07-27 | 江苏东交工程设计顾问有限公司 | Durable rapid repair material for pavement around inspection well and preparation and detection method of durable rapid repair material for pavement around inspection well |
| CN106431140A (en) * | 2016-09-22 | 2017-02-22 | 广东华路交通科技有限公司 | Novel roller compacted concrete base material and preparation method thereof |
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Open date: 20081217 |