CN101571466B - Indoor small size load testing method for asphalt mixture - Google Patents
Indoor small size load testing method for asphalt mixture Download PDFInfo
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- CN101571466B CN101571466B CN2009100722929A CN200910072292A CN101571466B CN 101571466 B CN101571466 B CN 101571466B CN 2009100722929 A CN2009100722929 A CN 2009100722929A CN 200910072292 A CN200910072292 A CN 200910072292A CN 101571466 B CN101571466 B CN 101571466B
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- 238000012360 testing method Methods 0.000 title claims abstract description 127
- 239000010426 asphalt Substances 0.000 title claims abstract description 36
- 239000000203 mixture Substances 0.000 title claims abstract description 18
- 230000003068 static effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 31
- 238000000465 moulding Methods 0.000 claims description 12
- 230000033228 biological regulation Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 230000014759 maintenance of location Effects 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 238000004026 adhesive bonding Methods 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 206010037660 Pyrexia Diseases 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 9
- 239000002131 composite material Substances 0.000 description 6
- 238000004379 similarity theory Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004141 dimensional analysis Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides an indoor small size load testing method for asphalt mixture, which relates to a load testing method for asphalt mixture. The invention aims at solving the problem that the existing rutting test can not accurately simulate the stressed state of an actual asphalt pavement. The invention first makes a test needed rutting specimen which is 300 mm in length, 300 mm in width and 140 mm in thickness, and wheel static pressure carbon paper is tested after a specified 700N load is added so as to obtain the area of wheel pressure on millimeter squared paper, thereby ground pressure is resolved; an automatic recording instrument for rutting deformation is started, and then a testing machine is started to make test wheels move back and forth until 45 to 70 minutes elapse or maximum deformation reaches 25 mm. During the test, the recording instrument automatically records a deformation curve and specimen temperature. The invention enables the rutting test to more accord withthe stressed condition of the actual pavement, more actually simulate the stressed state of the asphalt pavement under the action of an actual wheel load, and more accurately evaluate the high temper ature stability of the asphalt mixture.
Description
Technical field
The present invention relates to a kind of load test method of asphalt.
Background technology
At present, the method for estimating stability at high temperature of asphalt mixture is a lot, and wherein, asphalt indoor small size load testing (wheel tracking test) has become the most frequently used shop experiment method.Wheel tracking test be test specimen under set point of temperature and loading condition, the determination test wheel formed rutting deformation speed that goes and back running is that dynamic stability DS represents with the walking number of times of every generation 1mm distortion.Its advantage is that the load mode that applies has reflected the actual loading situation on the road surface, and test findings and road surface actual state have correlativity preferably, and instrument is relatively cheap, easy operating.
But the existing standard wheel tracking test exists following deficiency: 1, wheel tracking test in China " highway engineering pitch and asphalt testing regulations JTJO52-2000 ", the sample dimensions of required standard is 300mm * 300mm * 50mm, thickness 50mm and brea bed surface layer thickness are similar, but material and the variation of structural thickness and the change of the actual operation condition of road along with modern bituminous pavement, adopt the wheel tracking test of standard specimen to show situation about not being inconsistent with physical condition, have engineering practice to show: serious rut problem has also appearred in the asphalt that the result that the standard wheel tracking test records is good; 2, in wheel tracking test, the lamina that rut test piece is made up of single asphalt, and actual pavement structure is the composite structure that different materials is formed; 3, the wheel load of standard wheel tracking test is the single-wheel load, and the standard wheel is the two-wheel group, replaces the rationality of two-wheel to await checking with single-wheel.
Therefore, existing wheel tracking test model awaits improving, and makes wheel tracking test can better simulate the stress of actual bituminous pavement, better estimates the high-temperature stability of asphalt.
Summary of the invention
The objective of the invention is can accurately not simulate the problem of the stress of actual bituminous pavement, a kind of indoor small size load testing method for asphalt mixture is provided for solving existing wheel tracking test.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: the detailed process of indoor small size load testing method for asphalt mixture is as follows:
Step 1: adopt the used rut test piece of rolling method of forming preparation test: the special-purpose metal test mould of test is adopted in the rut test piece moulding, the material structure of asphalt rut test piece is identical with actual top course material structure, and dwindle according to the ratio of actual top course thickness, and the forming method of employing layered rolling, at first according to the rut panel forming method moulding bottom plate of regulation and stipulation, brushing one deck gluing layer on the surface of bottom plate, again according to the rut panel forming method moulding last layer of regulation and stipulation, with as above two～three layers of asphalt of method moulding, the time interval of every layer of making is 18～30 hours, finally makes the rut test piece of the required long 300mm * wide 300mm * thick 140mm of test;
Step 2: experimental wheel ground connection pressure is measured: carry out before being determined at test, on testing table, place the steel plate that 50mm is thick, millimeter square paper in shop on steel plate, new transfer paper in shop on the millimeter square paper, experimental wheel is with the 700N load static pressure transfer paper of regulation, can on the millimeter square paper, draw the wheel load area, and try to achieve ground connection pressure thus;
Step 3: with rut test piece together with metal test mould, place the constant temperature enclosure of 60 ± 1 ℃ of test temperatures, be incubated 7～24 hours, on the position that the experimental wheel of rut test piece is not walked, paste a thermocouple thermometer, control rut test piece temperature stabilization is at 60 ± 0.5 ℃;
Step 4: with rut test piece together with the metal test mould dislocation on the testing table of rut testing machine, experimental wheel is at the central part of rut test piece, its direction of travel roll with rut test piece or direction of traffic consistent; Start the rutting deformation self-recording device, the starting characteristics test machine goes and back running experimental wheel then, and the time is 60 minutes, or the maximum distortion of rut test piece when reaching 25mm till, during test, registering instrument writes down deformation curve and test specimen temperature automatically.
The present invention at first applications similar theory draws similarity relation between bituminous pavement and each parameter of wheel tracking test improved model, via these relations, and then make the material parameter of this model, the size of imposed load etc., simultaneously model experiment results is reverted in the actual road surface; Next selects three kinds of typical pavement structures for use, utilizes common finite element software ABAQUS to carry out finite element numerical simulation, draws the load coverage under the dual wheel loading effect, is obtained the rut model size of full structure by geometric similarity; In view of the above, according to the principle of mechanical response equivalence, the ground connection width of final confirmed test wheel is the single-wheel load of 48mm; Select for use three kinds of rut model to carry out the wheel tracking test analysis at last, verified the correctness of composite plate rut model by model experiment results.
The model that the maturation of similarity theory and finite element makes us seek realistic condition becomes possibility.Similarity theory is the theory of the various physical process principles of similitude in research nature and the engineering, as with the various physical processes of Test Research with intactly put in order and the conventional method of composite score, similarity theory has been widely used in many fields such as hydraulics, thermal conduction study, thermodynamics and physical chemistry.Important application of similarity theory is to be used to refer to the guided mode test, and promptly the method with dimensional analysis derives similarity criterion, carries out model test according to similarity theory.
The invention has the beneficial effects as follows: by improvement wheel tracking test moulded dimension and structure composition, promptly replace 50mm thickness with 140mm thickness, the composite plate rut model of forming with actual pavement structure replaces the lamina rut model only be made up of the upper layer material, the feasible force-bearing situation that improves the more realistic road surface of wheel tracking test, the stress of the bituminous pavement under the real simulated actual wheel load action more, thus the high-temperature stability of asphalt estimated more accurately.
Embodiment
Embodiment one: the process of present embodiment load test method is as follows:
Step 1: adopt the used rut test piece of rolling method of forming preparation test: the special-purpose metal test mould of test is adopted in the rut test piece moulding, the material structure of asphalt rut test piece is identical with actual top course material structure, and dwindle according to the ratio of actual top course thickness, and the forming method of employing layered rolling, at first according to the rut panel forming method moulding bottom plate of regulation and stipulation, brushing one deck gluing layer on the surface of bottom plate, again according to the rut panel forming method moulding last layer of regulation and stipulation, with as above two～three layers of asphalt of method moulding, the time interval of every layer of making is 18～30 hours, finally make the rut test piece of the required long 300mm * wide 300mm * thick 140mm of test, above-mentioned standard is pitch and asphalt testing regulations (JTJ052-2000);
Step 2: experimental wheel ground connection pressure is measured: carry out before being determined at test, on testing table, place the steel plate that 50mm is thick, millimeter square paper in shop on steel plate, new transfer paper in shop on the millimeter square paper, experimental wheel is with the 700N load static pressure transfer paper of regulation, can on the millimeter square paper, draw the wheel load area, and try to achieve ground connection pressure thus;
Step 3: with rut test piece together with metal test mould, place the constant temperature enclosure of 60 ± 1 ℃ of test temperatures, be incubated 7～24 hours, on the position that the experimental wheel of rut test piece is not walked, paste a thermocouple thermometer, control rut test piece temperature stabilization is at 60 ± 0.5 ℃;
Step 4: with rut test piece together with the metal test mould dislocation on the testing table of rut testing machine, experimental wheel is at the central part of rut test piece, its direction of travel roll with rut test piece or direction of traffic consistent; Start the rutting deformation self-recording device, the starting characteristics test machine goes and back running experimental wheel then, and the time is 60 minutes, or the maximum distortion of rut test piece when reaching 25mm till, during test, registering instrument writes down deformation curve and test specimen temperature automatically.
Embodiment two: the layer-built time interval described in the present embodiment step 1 is 20～26 hours.The selection of time of present embodiment is in a preferred range, and its test findings is comparatively desirable, and other method is identical with embodiment one.
Embodiment three: the layer-built time interval described in the present embodiment step 1 is 24 hours.The selection of time of present embodiment is best, and its test findings is ideal, and other method is identical with embodiment two.
Embodiment four: the tack coat described in the present embodiment step 1 is an emulsified asphalt.Emulsified asphalt is most economical practicality as the tack coat (agent) of composite plate rut model interlayer, and test effect is good, and other method is identical with embodiment one.
Embodiment five: the ground connection width of the experimental wheel described in the present embodiment step 2 is the single-wheel load of 48mm.It is accurate that the ground connection width of experimental wheel is that the single-wheel load of 48mm meets the testing requirements and the test findings of " composite plate rut model ", and other method is identical with embodiment one.
Embodiment six: the temperature retention time described in the present embodiment step 3 is 9～21 hours.Other method is identical with embodiment one.
Embodiment seven: the temperature retention time described in the present embodiment step 3 is 11～19 hours.Other method is identical with embodiment six.
Embodiment eight: the temperature retention time described in the present embodiment step 3 is 13～17 hours.Other method is identical with embodiment seven.
Embodiment nine: the temperature retention time described in the present embodiment step 3 is 14 hours.Other method is identical with embodiment eight.
Above-mentioned embodiment six to nine, the scope of its temperature retention time is descending, and effect is also become better and better.
Claims (9)
1. indoor small size load testing method for asphalt mixture, it is characterized in that: the process of load test method is as follows:
Step 1: adopt the used rut test piece of rolling method of forming preparation test: the special-purpose metal test mould of test is adopted in the rut test piece moulding, the material structure of asphalt rut test piece is identical with actual top course material structure, and dwindle according to the ratio of actual top course thickness, and the forming method of employing layered rolling, at first according to the rut panel forming method moulding bottom plate of regulation and stipulation, brushing one deck gluing layer on the surface of bottom plate, again according to the rut panel forming method moulding last layer of regulation and stipulation, with as above two～three layers of asphalt of method moulding, the time interval of every layer of making is 18～30 hours, finally makes the rut test piece of the required long 300mm * wide 300mm * thick 140mm of test;
Step 2: experimental wheel ground connection pressure is measured: carry out before being determined at test, on testing table, place the steel plate that 50mm is thick, millimeter square paper in shop on steel plate, new transfer paper in shop on the millimeter square paper, experimental wheel is with the 700N load static pressure transfer paper of regulation, can on the millimeter square paper, draw the wheel load area, and try to achieve ground connection pressure thus;
Step 3: with rut test piece together with metal test mould, place the constant temperature enclosure of 60 ± 1 ℃ of test temperatures, be incubated 7～24 hours, on the position that the experimental wheel of rut test piece is not walked, paste a thermocouple thermometer, control rut test piece temperature stabilization is at 60 ± 0.5 ℃;
Step 4: with rut test piece together with the metal test mould dislocation on the testing table of rut testing machine, experimental wheel is at the central part of rut test piece, its direction of travel roll with rut test piece or direction of traffic consistent; Start the rutting deformation self-recording device, the starting characteristics test machine goes and back running experimental wheel then, and the time is 60 minutes, or the maximum distortion of rut test piece when reaching 25mm till, during test, registering instrument writes down deformation curve and test specimen temperature automatically.
2. indoor small size load testing method for asphalt mixture according to claim 1 is characterized in that: the layer-built time interval described in the step 1 is 20～26 hours.
3. indoor small size load testing method for asphalt mixture according to claim 2 is characterized in that: the layer-built time interval described in the step 1 is 24 hours.
4. indoor small size load testing method for asphalt mixture according to claim 1 is characterized in that: the gluing layer described in the step 1 is an emulsified asphalt.
5. indoor small size load testing method for asphalt mixture according to claim 1 is characterized in that: the ground connection width of the experimental wheel described in the step 2 is the single-wheel load of 48mm.
6. indoor small size load testing method for asphalt mixture according to claim 1 is characterized in that: the temperature retention time described in the step 3 is 9～21 hours.
7. indoor small size load testing method for asphalt mixture according to claim 6 is characterized in that: the temperature retention time described in the step 3 is 11～19 hours.
8. indoor small size load testing method for asphalt mixture according to claim 7 is characterized in that: the temperature retention time described in the step 3 is 13～17 hours.
9. indoor small size load testing method for asphalt mixture according to claim 8 is characterized in that: the temperature retention time described in the step 3 is 14 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100722929A CN101571466B (en) | 2009-06-15 | 2009-06-15 | Indoor small size load testing method for asphalt mixture |
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| CN2009100722929A CN101571466B (en) | 2009-06-15 | 2009-06-15 | Indoor small size load testing method for asphalt mixture |
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| CN101571466B true CN101571466B (en) | 2011-02-02 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721396A (en) * | 2012-06-28 | 2012-10-10 | 中钢集团马鞍山矿山研究院有限公司 | Novel method for measuring area of rock point load test fracture surface |
| CN102944488B (en) * | 2012-11-19 | 2015-04-22 | 长安大学 | Method for testing rut resistance of multi-layered combined structure mixtures of bituminous pavements |
| CN103091179B (en) * | 2013-01-10 | 2014-08-13 | 长安大学 | Interlamination shear-resisting track test mould of large longitudinal-slope asphalt pavement |
| CN104048886B (en) * | 2014-06-26 | 2016-04-27 | 东南大学 | A kind of Permafrost Area asphalt Frozen-thawed cycled fatigue test method |
| CN105241749B (en) * | 2015-11-10 | 2019-02-12 | 昆山市交通工程试验检测中心有限公司 | A kind of modified asphalt mixture in track test device |
| CN106153446A (en) * | 2016-08-31 | 2016-11-23 | 南京林业大学 | A kind of method of testing of permanent deformation for asphalt pavement |
| CN107884294B (en) * | 2017-11-10 | 2020-06-30 | 江苏中路工程技术研究院有限公司 | Method for testing fatigue performance of pavement material |
| CN108318323B (en) * | 2018-01-04 | 2020-04-21 | 长安大学 | Method for controlling plastic deformation performance of graded crushed stone based on PDI index |
| CN108508190A (en) * | 2018-04-18 | 2018-09-07 | 长沙理工大学 | A kind of vehicle tracking test instrument under simulation braking state |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641901A (en) * | 1995-11-06 | 1997-06-24 | Powell; Raymond | Asphalt concrete sample rutting machine |
| CN2335140Y (en) * | 1998-07-29 | 1999-08-25 | 吴素钦 | Automatic vehicle tracking test instrument |
| US6799471B1 (en) * | 2003-06-12 | 2004-10-05 | Instrotek, Inc. | System and method for conditioning and detection of moisture damage in asphalt mixes |
-
2009
- 2009-06-15 CN CN2009100722929A patent/CN101571466B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641901A (en) * | 1995-11-06 | 1997-06-24 | Powell; Raymond | Asphalt concrete sample rutting machine |
| CN2335140Y (en) * | 1998-07-29 | 1999-08-25 | 吴素钦 | Automatic vehicle tracking test instrument |
| US6799471B1 (en) * | 2003-06-12 | 2004-10-05 | Instrotek, Inc. | System and method for conditioning and detection of moisture damage in asphalt mixes |
Non-Patent Citations (2)
| Title |
|---|
| 李一鸣.沥青混合料车辙试验研究.《重庆交通学院学报》.1992,第11卷(第1期),95-103. * |
| 谭忆秋等.沥青混凝土路面车辙形成机理及主要因素分析.《公路》.2008,(第11期),19-24. * |
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