CN102494961A - Asphalt surface layer structure anti-rutting performance evaluation method - Google Patents
Asphalt surface layer structure anti-rutting performance evaluation method Download PDFInfo
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- CN102494961A CN102494961A CN2011103597078A CN201110359707A CN102494961A CN 102494961 A CN102494961 A CN 102494961A CN 2011103597078 A CN2011103597078 A CN 2011103597078A CN 201110359707 A CN201110359707 A CN 201110359707A CN 102494961 A CN102494961 A CN 102494961A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 81
- 239000002344 surface layer Substances 0.000 title abstract description 15
- 238000011156 evaluation Methods 0.000 title abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 79
- 239000008186 active pharmaceutical agent Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 16
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 238000013461 design Methods 0.000 description 9
- 238000010998 test method Methods 0.000 description 7
- 238000005457 optimization Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000002715 modification method Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000011218 segmentation Effects 0.000 description 3
- QTXHFDHVLBDJIO-UHFFFAOYSA-N Prothoate Chemical compound CCOP(=S)(OCC)SCC(=O)NC(C)C QTXHFDHVLBDJIO-UHFFFAOYSA-N 0.000 description 2
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- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
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Abstract
The invention discloses an asphalt surface layer structure anti-rutting performance evaluation method which is characterized by firstly setting rutting test conditions, carrying out full-thickness rutting test on an asphalt surface layer combined structure test piece, and calculating according to the following formula to obtain the overall dynamic stability DS of the asphalt surface layer structureT，
In the formula: d3、d4-rolling 1890 th and 2520 th respective displacement deformations; finally, according to the set dynamic stability control standard [ DS ] of the asphalt surface layer structure]TTesting the anti-rutting performance of the asphalt surface layer composite structure, if DST＞[DS]TAnd the asphalt surface layer structure meets the requirement of anti-rutting performance. The method for evaluating the rutting resistance of the asphalt surface layer structure can accurately reflect the rutting resistance of the asphalt surface layer structure and can be used as a beneficial guide for designing asphalt pavements.
Description
Technical field
The present invention relates to the anti-rut method of evaluating performance of a kind of asphalt mat structure.
Background technology
China's code requirement is formed the anti-rut performance of design link check asphalt at asphalt mixture material; But this only can reflect the anti-rut performance of asphalt; And the asphalt mat structure of forming by the asphalt that is up to the standards, how its whole anti-rut performance has no way of learning.Engineering practice also shows, after the asphalt that is up to the standards applies to engineering, but finds the rut disease repeatedly.That is to say that the anti-rut method of evaluating performance of current specifications is difficult to guarantee the anti-rut performance of pavement structure, need estimate asphalt pavement rut from the angle of structure.
Summary of the invention
Technical matters to be solved by this invention provides the anti-rut method of evaluating performance of a kind of asphalt mat structure; The anti-rut method of evaluating performance of this asphalt mat structure can accurately reflect the anti-rut performance of asphalt mat structure, can be used as the useful guidance of bituminous pavement design.
The technical solution of invention is following:
The anti-rut method of evaluating performance of a kind of asphalt mat structure is at first set the wheel tracking test condition, and asphalt mat unitized construction test specimen is carried out complete thick formula wheel tracking test, obtains asphalt mat structural entity dynamic stability DS according to computes
T,
In the formula:
d
3, d
4-be respectively rolling the 1890th time and the 2520th corresponding displacement deformation, promptly the wheel load place is with respect to the displacement of the surperficial depression of test specimen, and unit is mm;
C
1-testing machine type correction factor, the speed change walking manner that drives test specimen for crank connecting link is 1.0, the chain drive mode be 1.5;
C
2-test specimen coefficient, standard specimen are 1.0;
At last, according to the asphalt mat structure dynamic stability control criterion of setting [DS]
TCheck the anti-rut performance of each asphalt mat unitized construction, if DS
T＞[DS]
T, then this asphalt mat structure satisfies anti-rut performance requirement.
Described wheel tracking test adopts complete thick formula asphalt mat test specimen, on complete thick formula wheel rutting test machine, carries out.
[DS]
TValue be 3200 times/mm.
Have only the anti-rut method of evaluating performance to asphalt at present, it requires actual measurement dynamic stability DS
C＞[DS]
C, wherein [DS]
CRepresent asphalt dynamic stability evaluation criterion.The present invention still continues to use this thinking, promptly requires actual measurement asphalt mat structural entity dynamic stability DS
T＞[DS]
T, wherein [DS]
TRepresent asphalt mat structural entity dynamic stability evaluation criterion.
At present both at home and abroad still not about the anti-rut performance of asphalt mat structural entity DS
TTest method.
The anti-rut method of evaluating performance of asphalt mat structure of the present invention comprises following content:
(1) novel rut test method
" novel rut test method " is made up of the modification method of novel wheel rutting test machine+wheel tracking test duration and dynamic stability computing formula, and be specific as follows:
1. " novel wheel rutting test machine
Compare with standard wheel rutting test machine (the wheel tracking test equipment of China's specification recommends); Loading variable size, the loading velocity of " novel wheel rutting test machine " is variable, the rut test piece variable thickness, can be in the inner formation temperature gradient of rut test piece, purpose is a simulated roadway actual state as much as possible.(patent No. ZL200910042874.2; ZL200920063519.9 speed change variable load thickening degree wheel rutting test machine)
2. wheel tracking test duration modification method
The test duration of setting in the standard wheel tracking test method is constant to be 1 hour, and corresponding loading velocity is 42 times/minute.After the adjustment of wheel tracking test loading velocity, still to continue to use 1 hour if test duration this moment, the number of times that rolls that will certainly cause rut test piece to receive has changed, and will directly have influence on the accumulation of rutting deformation.For this reason; The present invention proposes the modification method of following wheel tracking test duration: when loading velocity changes; Should experimental wheel the total rolling number of times of test specimen not become principle when guaranteeing to test at every turn; When being the 1/n of standard rolling speed, test n that duration should be adjusted into the code test time so doubly when rolling speed.
3. the modification method of dynamic stability (be called for short DS) computing formula
Current specifications is following about the computing formula of DS:
In the formula:
t
1, t
2Be respectively the 45th minute and the 60th minute;
d
1, d
2Be respectively of the displacement (mm) of the corresponding wheel load place in the 45th minute and the 60th minute with respect to the surperficial depression of test specimen;
C
1-testing machine type correction factor, the speed change walking manner that drives test specimen (referring to existing standard) for crank connecting link is 1.0, the chain drive mode be 1.5;
C
2-test specimen coefficient, standard specimen are 1.0.[definition of standard specimen is referring to existing standard.】
Calculation level in the formula (1) is taken at the 45th minute and the 60th minute, and 42 * (t
2-t
1) what represent is the rolling number of times that increases between these two calculation time.After rolling speed changes, continue to adopt the 45th minute just not too suitable with the 60th minute as calculation level.
Correction principle with reference to the test duration; The present invention proposes the change modification method of back DS computing formula of following rolling speed: calculation level is fixed as rolling the 1890th time and rolling the 2520th time (the rolling number of times when corresponding respectively in the standard wheel tracking test method the 45th minute and the 60th minute); When being 1/2 standard rolling speed like the experimental wheel rolling speed, calculation level the 1890th time and the 2520th time corresponding the 90th minute and the 120th minute respectively.。According to the method, 42 * (t in the formula (1)
2-t
1) will become 630 (because 2520-1890=630).At this moment, the dynamic stability computing formula of correction is following:
In the formula:
d
3, d
4-be respectively rolling the 1890th time and the displacement (mm) of the 2520th corresponding wheel load place with respect to the surperficial depression of test specimen;
(2) the anti-rut performance test of asphalt mat structural entity
1. confirm representative wheel tracking test condition
According to the actual linear condition (the longitudinal gradient gradient, length of grade) of road, pavement temperature field situation, traffic (volume of traffic, axle carry size and form), confirm " representativeness " wheel tracking test condition, comprising: loading velocity, thermograde, trial load.
2. carry out complete thick formula asphalt mat wheel tracking test under " representativeness " test condition
Be combined into different asphalt mat structures by the qualified asphalt of the anti-rut service check of material; Utilize " novel rut test method "; Under " representativeness " test condition, carry out the complete thick formula wheel tracking test of each asphalt mat unitized construction, obtain asphalt mat structural entity dynamic stability DS
T
(3) estimate the anti-rut performance of asphalt mat structure
According to the asphalt mat structure dynamic stability control criterion of setting [DS]
TCheck the anti-rut performance of each asphalt mat unitized construction, if DS
T＞[DS]
T, then this asphalt mat structure satisfies anti-rut performance requirement;
From a plurality of alternativess that satisfy above-mentioned requirements, comprehensively compare with economy two aspects through technical, optimize the best asphalt mat structure of anti-rut performance: promptly select the whole dynamic stability DS of actual measurement on the one hand technically
TSurpass [DS]
TAnd near [DS]
TThe asphalt mat structure, on the other hand from the minimum asphalt mat structure of the required investment of the angle Selection of economy.
Beneficial effect:
The anti-rut method of evaluating performance of asphalt mat structure of the present invention has the following advantages:
1. can the asphalt mat structure be used as an integral body and estimate its anti-rut performance, instruct the asphalt pavement structure combination more intuitively;
2. can carry out anti-rut performance design and optimization targetedly according to the physical condition (as grow up upgrade car low speed driving highway section, heavily loaded traffic etc.) of road;
3. utilize the present invention, can realize the structure optimization of the anti-rut performance of asphalt mat, never, have huge economic implications and then social benefit with optimizing the most economical pavement structure that satisfies anti-rut performance requirement in the textural association of road surface.
Embodiment
Below will combine specific embodiment that the present invention is explained further details:
Applicant embodiment 1:
The initial surface layer structure of certain highway uphill way does
4.5cmSMA-16+5.5cmAC-20+6cmAC-25。Former road surface traction engine ratio is bigger, after the half a year that is open to traffic, has produced serious rut at uphill way; Afterwards the punishment scheme of resurfacing after the milling had been taked on former road surface, the pavement structure after the punishment is 4.5cmFAC-13+5.5cm FAC-20+6cmFAC-25, and three layers are all adopted modified bitumen to make binder.After the maintenance, the pavement track disease seldom.
If the standard of employing wheel tracking test method is carried out wheel tracking test respectively to above-mentioned six kinds of asphalts, test condition is a standard test conditions: load 0.7Mpa, loading velocity 42 times/minute, 60 ℃ of homogeneous temperature fields.Test findings is seen table 1.
Each layer of table 1 surface layer asphalt standard wheel tracking test result
The related specifications of contrast China, the listed each item DS of table 1 surpasses the respective standard that standard is set, and that is to say the rut control method according to standard, and material is (method of standard can only have been accomplished so at present) that can resist rut.In this sense, the asphalt mat that is formed by these combinations of materials should also can satisfy anti-rut performance, but that the application of entity project demonstrates the anti-rut performance of initial bitumen surface layer structure is obviously not enough.That is to say, can not reflect the anti-rut performance of heavily loaded uphill way asphalt mat according to standard wheel tracking test condition gained test findings.
Utilize method of the present invention, set " representativeness " wheel tracking test condition and be: rolling load and loading velocity are respectively 1.1Mpa and 14 times/minute, and thermograde is 45 ℃ of surperficial 60 ℃, bottom surface, and change the individual layer wheel tracking test into complete thick formula wheel tracking test.Test findings is seen table 2.
The complete thick formula wheel tracking test result of table 2 asphalt mat
3200 times/mm of asphalt mat structure dynamic stability control criterion according to setting checks; Table 2 shows that clearly the SMA-16+AC-20+AC-25 structure is not enough to resist rut; And the FAC-13+FAC-20+FAC-25 structure can be resisted rut, and the effect of entity project has also proved this point.
This embodiment shows that method of the present invention can be used in anti-rut performance evaluation of structure and textural association optimization is carried out in the upward slope road surface of growing up.
Embodiment 2:
Certain highway has nearly 50 kilometers continuous uphill ways, and former Pavement Design surface layer structure is 4cmSMA-13+5cm modified bitumen AC-20+6cmAC-20.Because the defective of standard, former design through the check of the anti-rut performance of structure, does not say it is most economical so can not guarantee this structure from the angle of anti-rut performance.In addition, this highway section discrepancy in elevation very big (the toe elevation is 920m, and sloping crest level is 2350m); Difference of elevation causes the temperature difference also very big, according to meteorological principle, and the every rising 100m of height above sea level, temperature descends 0.6 ℃, and the top, slope differs with the toe temperature and is about 9 ℃ so; Climbing also will cause Vehicle Speed more and more slower continuously, and heavy-duty vehicle is especially serious.
This shows that the continuous uphill way of this overlength is difficult to adopt unified wheel tracking test condition, needs segmentation to handle.Here be divided into three sections, corresponding elevation scope is respectively 920m～1320m (highway section, the end, slope), 1320m～1830m (in the slope highway section), 1830m～2350m (Po Ding highway section).The representative test condition that segmentation is confirmed is seen table 3, and the combination of (temperature, speed, load) is respectively (55,20,11), (52,14,11), (49,14,11).[load unit is Mpa, loading velocity unit is time/minute, temperature is degree centigrade]
According to method of the present invention, under the representative test condition, carried out the whole wheel tracking test of different surface layer unitized constructions, test findings is seen table 3.
Table 3 different pitches combined facing layer structure wheel tracking test condition and test findings
3200 times/mm of asphalt mat structure dynamic stability control criterion according to setting checks; Former Pavement Design structure SMA-13+ modified bitumen AC-20+AC-20 is used in highway section, the end, slope, and (corresponding (temperature, speed, load) is (55; 20; 11) be to resist rut fully), but its anti-rut performance have obvious having more than needed, and must cause uneconomical; Though the SMA-13+AC-20+AC-20 structure is economical, rut never can resist; The anti-rut performance bound of SMA-13+2 ‰ anti-rut agent AC-20+AC-20 structure has reached the balance of anti-rut performance and economy between above-mentioned two kinds of structures, become optimum surface layer structure assembled scheme.Equally, 3200 times/mm estimates according to the dynamic stability control criterion, and highway section and Po Ding highway section asphalt mat optimum structure assembled scheme are respectively SMA-13+1 ‰ anti-rut agent AC-20+AC-20 and SMA-13+AC-20+AC-20 in the slope.
This embodiment shows that method of the present invention can be used in to overlength the segmentation of going up a slope continuously and carries out anti-rut performance evaluation of pavement structure and textural association optimization.
Embodiment 3:
The former design asphalt mat of certain highway structure is 4cmSBS modified bitumen AC-13+6cmSBS modified bitumen AC-20+7cm AC-25; Because the defective of standard; Former design through the check of the anti-rut performance of structure, does not say it is most economical so can not guarantee this structure from the angle of anti-rut performance.In addition, this road up direction and down direction volume of traffic difference are bigger, will utilize method of the present invention to carry out structure optimization here, for the uplink and downlink direction is confirmed optimum structure combination separately respectively.
Representative wheel tracking test condition: because up direction is bigger than down direction traction engine ratio; Corresponding wheel tracking test load is respectively 1.1MPa and 0.9MP: the temperature conditions on uplink and downlink direction road surface is identical; Thermograde is taken as 60 ℃ of asphalt mat end faces, 46 ℃ of bottom surfaces; This road longitudinal gradient is less, so it is identical to get the road speed on uplink and downlink direction road surface, is 42 times/minute.
Utilize method of the present invention, under the representative test condition, carried out the wheel tracking test of various combination asphalt mat structure, test findings is seen table 4.
The anti-rut performance test of the various pavement structures of table 4 result
3200 times/the mm of asphalt mat structure dynamic stability control criterion that sets according to us checks; It is can resist rut fully that former Pavement Design structure " modified bitumen AC-13+ modified bitumen AC-20+AC-25 " is used in down direction; But its anti-rut performance has obviously more than needed, must cause uneconomical; And the anti-rut performance of modified bitumen AC-13+0.15% anti-rut agent AC-20+AC-25 structure had both met the demands, and very near the structure dynamic stability control criterion of setting, obviously economy is fine, can be as optimal case again.Up direction adopts 0.35% anti-rut agent AC-13+0.25% anti-rut agent AC-20+AC-25 structure can reach the balance of anti-rut performance and economy, can be used as the optimum structure scheme.
This embodiment shows and carries out anti-rut performance evaluation in road surface and textural association optimization when method of the present invention can be used in the different traffic of highway up-downgoing.
Claims (3)
1. the anti-rut method of evaluating performance of asphalt mat structure is characterized in that, at first sets the wheel tracking test condition, and asphalt mat unitized construction test specimen is carried out complete thick formula wheel tracking test, obtains asphalt mat structural entity dynamic stability DS according to computes
T,
In the formula:
d
3, d
4-be respectively rolling the 1890th time and the 2520th corresponding displacement deformation, promptly the wheel load place is with respect to the displacement of the surperficial depression of test specimen, and unit is mm;
C
1-testing machine type correction factor, the speed change walking manner that drives test specimen for crank connecting link is 1.0, the chain drive mode be 1.5;
C
2-test specimen coefficient, standard specimen are 1.0;
At last, according to the asphalt mat structure dynamic stability control criterion of setting [DS]
TCheck the anti-rut performance of each asphalt mat unitized construction, if DS
T＞[DS]
T, then this asphalt mat structure satisfies anti-rut performance requirement.
2. the anti-rut method of evaluating performance of asphalt mat structure according to claim 1 is characterized in that, described wheel tracking test adopts complete thick formula asphalt mat test specimen, on complete thick formula wheel rutting test machine, carries out.
3. the anti-rut method of evaluating performance of asphalt mat structure according to claim 1 and 2 is characterized in that [DS]
TValue be 3200 times/mm.
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Cited By (9)
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|---|---|---|---|---|
| CN103822594A (en) * | 2014-02-28 | 2014-05-28 | 华南理工大学 | Workpiece scanning imaging method based on laser sensor and robot |
| CN105651977A (en) * | 2015-08-28 | 2016-06-08 | 武汉理工大学 | Asphalt pavement aging simulating method |
| CN108107194A (en) * | 2017-11-30 | 2018-06-01 | 厦门华特公路沥青技术有限公司 | A kind of method and application for measuring asphalt suitable for open to traffic |
| CN109696367A (en) * | 2019-02-28 | 2019-04-30 | 苏州规划设计研究院股份有限公司 | A method of calculating modified asphalt mixture dynamic stability |
| CN110095352A (en) * | 2019-04-24 | 2019-08-06 | 西南交通大学 | A kind of bituminous pavement interlayer performance test method and device |
| CN110186953A (en) * | 2019-07-04 | 2019-08-30 | 交通运输部公路科学研究所 | A kind of temperature correction of the road surface pendulum value index based on asphalt surface course equivalent temperature |
| CN110411873A (en) * | 2019-08-12 | 2019-11-05 | 长沙理工大学 | A kind of method of preferred Rigid-flexible composite of the road wheel tracking test |
| CN114197262A (en) * | 2021-11-19 | 2022-03-18 | 山东省交通科学研究院 | Method for treating combination of full-thickness asphalt pavement and roadbed |
| CN114324143A (en) * | 2021-12-14 | 2022-04-12 | 东南大学 | Method for measuring three-dimensional shape characteristic index of asphalt pavement texture |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822594A (en) * | 2014-02-28 | 2014-05-28 | 华南理工大学 | Workpiece scanning imaging method based on laser sensor and robot |
| CN105651977A (en) * | 2015-08-28 | 2016-06-08 | 武汉理工大学 | Asphalt pavement aging simulating method |
| CN108107194A (en) * | 2017-11-30 | 2018-06-01 | 厦门华特公路沥青技术有限公司 | A kind of method and application for measuring asphalt suitable for open to traffic |
| CN109696367A (en) * | 2019-02-28 | 2019-04-30 | 苏州规划设计研究院股份有限公司 | A method of calculating modified asphalt mixture dynamic stability |
| CN109696367B (en) * | 2019-02-28 | 2021-03-30 | 苏州规划设计研究院股份有限公司 | Method for calculating dynamic stability of modified asphalt mixture |
| CN110095352A (en) * | 2019-04-24 | 2019-08-06 | 西南交通大学 | A kind of bituminous pavement interlayer performance test method and device |
| CN110186953B (en) * | 2019-07-04 | 2021-06-25 | 交通运输部公路科学研究所 | Temperature correction method of pavement pendulum value index based on equivalent temperature of asphalt surface layer |
| CN110186953A (en) * | 2019-07-04 | 2019-08-30 | 交通运输部公路科学研究所 | A kind of temperature correction of the road surface pendulum value index based on asphalt surface course equivalent temperature |
| CN110411873A (en) * | 2019-08-12 | 2019-11-05 | 长沙理工大学 | A kind of method of preferred Rigid-flexible composite of the road wheel tracking test |
| CN110411873B (en) * | 2019-08-12 | 2022-02-08 | 长沙理工大学 | Method for optimizing rut test of rigid-flexible composite pavement |
| CN114197262A (en) * | 2021-11-19 | 2022-03-18 | 山东省交通科学研究院 | Method for treating combination of full-thickness asphalt pavement and roadbed |
| CN114324143A (en) * | 2021-12-14 | 2022-04-12 | 东南大学 | Method for measuring three-dimensional shape characteristic index of asphalt pavement texture |
| CN114324143B (en) * | 2021-12-14 | 2023-12-12 | 东南大学 | Measuring method for three-dimensional shape characteristic index of asphalt pavement texture |
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