CN103969138A - Evaluation device and method for reflection crack resistance of asphalt mixture - Google Patents
Evaluation device and method for reflection crack resistance of asphalt mixture Download PDFInfo
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- CN103969138A CN103969138A CN201410181240.6A CN201410181240A CN103969138A CN 103969138 A CN103969138 A CN 103969138A CN 201410181240 A CN201410181240 A CN 201410181240A CN 103969138 A CN103969138 A CN 103969138A
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Abstract
The invention discloses an evaluation device and method for reflection crack resistance of an asphalt mixture. The evaluation device comprises a vertical loading device, a fixed plate, a sliding plate, a horizontal sliding device and a workbench; the fixed plate and the sliding plate are mounted on the workbench; the horizontal sliding device is mounted on the workbench and connected to the sliding plate; the vertical loading device is vertically mounted on the workbench and is positioned above a bearing plate; a test piece is placed on the fixed plate and the sliding plate, and below the vertical loading device. Through the adoption of the evaluation device and method, the number of reflection cracks in an asphalt pavement is reduced, the service life of the asphalt pavement is prolonged, and the evaluation device and method are of great significance.
Description
Technical field
The invention belongs to road engineering field, relate in particular to a kind of asphalt Reflection Cracking valuator device and method.
Background technology
Reflection crack is one of Major Diseases type of current bituminous pavement, and the structural sheet under asphalt mat exists incipient crack, will produce stress and concentrate, thereby upwards the cracking that causes brea bed is expanded in reflection under driving effect.Under asphalt mat, the incipient crack of structural sheet generally comprises two aspects: while adopting semi-rigid type base, because the semi-rigid materials such as cement stabilized macadam are the processes of a volumetric contraction in intensity forming process, therefore can produce unavoidably the cracking of some.Next is to adopt roller compacted concrete, cement concrete as basic unit, or Old cement road face is while overlaying brea bed, and basic unit is for avoiding inhomogeneous cracking need cut in advance crack.
Once bituminous pavement generation reflection crack, in the time of rainfall, moisture easily infiltrates inside, road surface, washes away ground surface material and causes later stage serious plant disease, such as purt mud, hole groove, loose etc. in the time that vehicle cycle rolls.Therefore how to reduce reflection crack by structural sheet or design of material optimization when semi-rigid asphalt pavement or overlay bituminous pavement occur, become the key of improving Pavement Condition.Conventionally adopt to semi-rigid sub-base material is carried out match ratio adjustment, thickeies asphalt mat, Reflection Cracking layer is set, is carried out the measures such as asphalt Reflective Cracking Resistance optimization at present.
China there is no standardization valuator device and the method for asphalt Reflective Cracking Resistance at present.
So far in China's related specifications code, method is not used for evaluating asphalt Reflective Cracking Resistance, and this makes the research shortage effective means of this aspect carry out quantitative test, is also difficult to different achievements in research to carry out across comparison.
The asphalt Reflective Cracking Resistance evaluation method of setting up in existing achievement in research, road pavement reflection crack influence factor is considered still not comprehensive.
Bituminous pavement generation reflection crack, gathers by theoretical analysis and on going result, and known major influence factors should comprise: layer fracture width that ftractureed, number of loading, load load-carrying, material type etc.And in the achievement that current domestic correlative study proposes, comprise and Feng Xinjun, Hu youngest brother etc. all each major influence factors is not carried out to system consideration, cause evaluation result to have certain query.
Summary of the invention
The object of the present invention is to provide a kind of asphalt Reflection Cracking valuator device and method, be intended to solve the current Reflective Cracking Resistance evaluation method of system without comparison of China, make correlation technique select and use the problem with blindness.
The present invention is achieved in that a kind of asphalt Reflection Cracking valuator device comprises vertical loading device, fixed head, sliding panel, location iron block, transverse slide, worktable; Fixed head and sliding panel are arranged on described worktable, described location iron block is positioned between fixed head and sliding panel, to form default crack, already present crack in simulation basic unit, transverse slide is arranged on worktable and one end of being arranged on loading plate is connected with sliding panel, vertical loading device is vertically arranged on worktable and is positioned at loading plate top, and test specimen is placed between charger and fixed head, sliding panel.
Further, described fixed head and the cutting of sliding panel upper surface, sliding panel makes, with asphalt plate, slippage does not occur when movable under charger and binding material effect, and fixed head is fixed, and sliding panel is slidably.
Further, described transverse slide regulates the sliding distance of sliding panel by top and side direction screw.
Further, described transverse slide, realizes the adjusting of slip number of times by leverage.
A kind of asphalt Reflection Cracking evaluation method comprises the following steps:
Step 1, according to road actual state determine default fracture width, sliding panel sliding distance, slip number of times, the vertical loading force of sliding panel in the unit interval;
Step 2, by rolling method (T0703 in highway engineering pitch and Asphalt Mixture Experiment code) moulding asphalt plate, each side cut 75mm, whitewash is smeared in side, epoxy resin is smeared in bottom surface, be placed in back up pad, to guarantee test specimen and back up pad bonds well;
Step 3, vertical loading device is placed on to sample end face, pressure rings reads power value, is realized and is accurately controlled vertical loading force by lifting jack adjustment;
Step 4, by the handle reinforcing of transverse slide, realize sliding panel and do shift reciprocately, sliding panel maximum displacement relies on transverse slide top and side screw accurately to control, loading number of times when calculating generation incipient crack, asphalt plate side and thoroughly rupturing, using this as asphalt Reflective Cracking Resistance evaluation index.
Asphalt Reflection Cracking valuator device of the present invention and method, will, to reducing asphalt pavement reflective cracking, extend bituminous pavement serviceable life, have great importance.
Brief description of the drawings
Fig. 1 is the structural representation of the asphalt Reflection Cracking valuator device that provides of the embodiment of the present invention;
Fig. 2 is the process flow diagram of the asphalt Reflection Cracking evaluation method that provides of the embodiment of the present invention;
In figure: 1, vertical loading device; 2, test specimen; 3, fixed head; 4, sliding panel; 5, location iron block, 6, transverse slide; 7, worktable.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 and Fig. 2 show asphalt Reflection Cracking valuator device of the present invention structure, as shown in the figure, the present invention is achieved in that a kind of asphalt Reflection Cracking valuator device comprises vertical loading device 1, fixed head 3, sliding panel 4, location iron block 5, transverse slide 6, worktable 7; Fixed head 3 and sliding panel 4 are arranged on described worktable 7, location iron block 5 is put between fixed head and sliding panel, transverse slide 6 is arranged on worktable 7 and with sliding panel and is connected, vertical loading device 1 is vertically arranged on worktable 7 and is positioned at fixed head 3 and sliding panel 4 tops, is of a size of 300*150*50mm test specimen 2 and is placed between vertical loading device 1 and fixed head 3 and sliding panel 4.
Fixed head 3 of the present invention and sliding panel 4 upper surface cuttings, fixed head 3 is fixing, and sliding panel 4 is slidably.Transverse slide 6 regulates the sliding distance of sliding panel 4 by top and side screw.Transverse slide 6, realizes the adjusting of slip number of times by leverage.
As shown in Figure 2, a kind of asphalt Reflection Cracking evaluation method comprises the following steps:
S101: according to road actual state determine default fracture width, sliding panel sliding distance, slip number of times, the vertical loading force of sliding panel in the unit interval;
S102: by rolling method (T0703 in highway engineering pitch and Asphalt Mixture Experiment code) moulding asphalt plate, each side cut 75mm, whitewash is smeared in side, epoxy resin is smeared in bottom surface, be placed on fixed head and sliding panel, to guarantee test specimen and its bonds well;
S103: vertical loading device is placed on to sample end face, and pressure rings reads power value, is realized and is accurately controlled vertical loading force by lifting jack adjustment;
S104: by the handle reinforcing of transverse slide, realize sliding panel and do shift reciprocately, sliding panel maximum displacement relies on transverse slide top and side screw accurately to control, loading number of times when calculating generation incipient crack, asphalt plate side and thoroughly rupturing, using this as asphalt Reflective Cracking Resistance evaluation index.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that performing creative labour can make or distortion still within protection scope of the present invention.
Claims (5)
1. an asphalt Reflection Cracking valuator device, is characterized in that, described asphalt Reflection Cracking valuator device comprises vertical loading device, fixed head, sliding panel, location iron block, transverse slide, worktable; Fixed head and sliding panel are arranged on described worktable, described transverse slide is arranged on worktable and with sliding panel and is connected, location iron block is put between fixed head and sliding panel, vertical loading device is vertically arranged on worktable and is positioned at fixed head and sliding panel top, test specimen be placed on fixed head and sliding panel and vertical loading device under.
2. asphalt Reflection Cracking valuator device as claimed in claim 1, it is characterized in that, described fixed head and the cutting of sliding panel upper surface, sliding panel can make, with asphalt plate, slippage does not occur when movable under charger and binding material effect, and fixed head and sliding panel size are 150*150*13mm.
3. asphalt Reflection Cracking valuator device as claimed in claim 1, it is characterized in that, between described fixed head and sliding panel, there is default crack, in order to simulate already present crack in basic unit, the crack of realizing different in width by insert the mode of detent rail piece between fixed head and sliding panel, iron block specification is 50*n*7mm, and wherein n can value be 1mm, 2mm, determines according to the actual crack of roadbase situation.
4. asphalt Reflection Cracking valuator device as claimed in claim 1, it is characterized in that, described transverse slide realizes the slip of interlock sliding panel by leverage, and passes through the horizontal sliding distance of the Joint regulation sliding panel of top screw and side direction screw.
5. an asphalt Reflection Cracking evaluation method, is characterized in that, described asphalt Reflection Cracking evaluation method comprises the following steps:
Step 1, according to road actual state determine default fracture width, sliding panel sliding distance, slip number of times, the vertical loading force of sliding panel in the unit interval;
Step 2, by rolling method moulding asphalt plate, each side cut 75mm, whitewash is smeared in side, epoxy resin is smeared in bottom surface, is placed on fixed head and sliding panel, to guarantee test specimen and its bonds well;
Step 3, vertical loading device is placed on to sample end face, pressure rings reads power value, is realized and is accurately controlled vertical loading force by lifting jack adjustment;
Step 4, by the handle reinforcing of transverse slide, realize sliding panel and do shift reciprocately, sliding panel maximum displacement relies on transverse slide top and side screw accurately to control, loading number of times when calculating generation incipient crack, asphalt plate side and thoroughly rupturing, using this as asphalt Reflective Cracking Resistance evaluation index.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410181240.6A CN103969138A (en) | 2014-04-30 | 2014-04-30 | Evaluation device and method for reflection crack resistance of asphalt mixture |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410181240.6A CN103969138A (en) | 2014-04-30 | 2014-04-30 | Evaluation device and method for reflection crack resistance of asphalt mixture |
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| CN103969138A true CN103969138A (en) | 2014-08-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738230A (en) * | 2016-04-30 | 2016-07-06 | 山西省交通科学研究院 | Asphalt mixture anti-reflection crack property testing device and testing method |
| CN106124320A (en) * | 2016-08-16 | 2016-11-16 | 同济大学 | A kind of composite runway pavement structure reflection crack assay device |
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| CN101178340A (en) * | 2007-11-21 | 2008-05-14 | 长安大学 | Asphalt pavement reflection crack propagation analog experiment device |
| CN102393339A (en) * | 2011-11-24 | 2012-03-28 | 长安大学 | Test method and apparatus for simulating actual pavement cracking through crack |
| CN103175747A (en) * | 2013-03-06 | 2013-06-26 | 湖北国创高新材料股份有限公司 | Pavement reflective cracking resistance testing method and testing device |
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2014
- 2014-04-30 CN CN201410181240.6A patent/CN103969138A/en active Pending
Patent Citations (3)
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| CN101178340A (en) * | 2007-11-21 | 2008-05-14 | 长安大学 | Asphalt pavement reflection crack propagation analog experiment device |
| CN102393339A (en) * | 2011-11-24 | 2012-03-28 | 长安大学 | Test method and apparatus for simulating actual pavement cracking through crack |
| CN103175747A (en) * | 2013-03-06 | 2013-06-26 | 湖北国创高新材料股份有限公司 | Pavement reflective cracking resistance testing method and testing device |
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| 冯新军 等: "沥青稳定碎石基层抗反射裂缝能力评价方法", 《中国公路学报》, vol. 24, no. 2, 31 March 2011 (2011-03-31) * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738230A (en) * | 2016-04-30 | 2016-07-06 | 山西省交通科学研究院 | Asphalt mixture anti-reflection crack property testing device and testing method |
| CN105738230B (en) * | 2016-04-30 | 2018-09-14 | 山西省交通科学研究院 | A kind of asphalt Reflection Cracking performance testing device and test method |
| CN106124320A (en) * | 2016-08-16 | 2016-11-16 | 同济大学 | A kind of composite runway pavement structure reflection crack assay device |
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