CN102183409B - Test method for performance of aged asphalt in waste asphalt concrete - Google Patents
Test method for performance of aged asphalt in waste asphalt concrete Download PDFInfo
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Abstract
The invention provides a test method for shear performance of asphalt concrete, which is characterized in that the method comprises the following steps: step 1: cutting a cylindric asphalt concrete specimen with a specified dimension from a pavement core; step 2: forming a cylindric standard specimen with the same parameters and dimensions as the specimen; step 3: heating the asphalt concrete specimen in a constant-temperature air bath till the interior of the specimen reaches a required temperature for the test; step 4: combining the specimen, a mould, a rubber film and a displacement sensor according to a specified method and centering; step 5: applying a static pressure which increases at a certain speed to a pressure head by power equipment till the specimen is destroyed; recording the vertical displacement and the load of the specimen by a data acquisition system during the test; keeping the temperature of the test environment at a required temperature during the test. The test method and the test index provided by the invention can evaluate the hardening and embrittlement characteristics of asphalt materials in aged asphalt concrete effectively and accurately.
Description
Technical field
The present invention relates to technical field of performance test after the ageing of asphalt.
Background technology
Over year, the highway in China construction develops rapidly surplus in the of nearly ten, and to the end of the year 2007, national mileage in highway open to traffic has reached 3,570,000 kilometers, and the highway mileage open to traffic surpasses 50,000 kilometers and occupies the second in the world; Wherein bituminous pavement has occupied the ratio more than 90%, and the SBS modified bitumen uses in high-grade highway again in a large number.See that from China's practical situation most of bituminous pavement short 2～3 years, just got into large tracts of land maintenance and transformation phase in long 5～6 years after operation.Therefore, China when highway is rapidly built, has got into a lasting extensive maintenance phase at present.Not only will practice thrift a large amount of natural resourcess to waste asphalt mixture, and can effectively practice thrift engineering cost and social cost simultaneously, along with the enhancing of environmental consciousness and the anxiety of petroleum resources, regeneration has become the important development direction of asphalt pavement conserving engineering.When waste asphalt mixture is carried out regeneration, at first to estimate the aging conditions of old pitch.Wearing out of pitch mainly shows two aspects, and promptly sclerosis and embrittlement appear in pitch.See that from the pitch index asphalt hardening shows as the pen. reduction, softening point reduces and viscosity improves, the pitch embrittlement shows as ductility and reduces; See that from the compound angle asphalt hardening shows as intensity and improves; High-temperature stability improves, and splitting resistance reduces, and fatigue behaviour reduces.At present, China adopts " extracting recoverys " method during to the evaluation of old asphalt concrete degree of aging, promptly at first with triclene the pitch in the waste asphalt mixture is dissolved in the triclene recovery liquid of formation " triclene+old pitch "; And then triclene is distilled, thereby obtain to reclaim pitch from reclaim liquid through recovery test.Through the performance (pen., softening point, ductility, viscosity) that estimate to reclaim pitch reflect the waste asphalt mixture medium pitch degree of aging.A large amount of researchs show that existing drawer recovery test exists various problems estimating on the plain asphalt compound degree of aging; These problems are more outstanding when estimating modified asphalt mixture, summarize it here.
(1) present, the extraction solvent of defined is a triclene in the standard, and when waste asphalt mixture was the matrix pitch consolidating material, triclene can dissolve it in the short period of time fully, and the pitch extracting that is about in the waste asphalt mixture is clean.When waste asphalt mixture is the modified bitumen cementitious matter; If will modified bitumen wherein be dissolved fully; Then need the long period;, when dissolving SBS modifier content is 5% aging modified bitumen, need more than the 10h like triclene, could it be dissolved basically (modifier that has some impurity or fail to dissolve).Generally speaking; Extraction test can not be carried out the so long time; Therefore, mostly the pitch that can cause institute's extracting to go out is to be wrapped in the outer pitch on the compound, thereby makes the pitch of final acquisition and the asphalt performance in the waste asphalt mixture produce certain difference.
(2) in extractive process, be difficult to accomplish breeze and solution are separated fully, even staticly settle, also have the part breeze and be present in the extracted solution through high speed centrifugation or 24h.Extracted solution is through after the distillation, and breeze can remain in and reclaim in the pitch.No matter have research data to show, when containing breeze in the pitch, be that matrix pitch or its character of modified bitumen will produce bigger variation, and promptly residual breeze can produce considerable influence to the character that reclaims pitch.
(3) in removal process, clean as will triclene being reclaimed, then need continue the heating long period more than 150 ℃, this can make pitch further aging again; If recovery time is not enough, and triclene is remained in the pitch, the ductility that reclaims pitch is significantly improved.And the SBS modified bitumen is after via dissolution with solvents, and the original structure of modified bitumen (like hub-and-spoke configuration, linear structure) is destroyed.This structure be since in the SBS modified asphalt manufacturing process SBS modifier swelling take place and form through high speed shear, and there are greatest differences in the SBS modified bitumen structure and the original structure that reclaim, this will be to the certain influence of evaluation generation of old pitch.
In a word, the method for testing of estimating the bituminous concrete degree of aging at present exists the deficiency of above several aspects, and promptly outstanding method of testing need satisfy the following aspects:
A is carrying out when the bituminous concrete degree of aging estimates, and can avoid that the character of aged asphalt changes in the waste asphalt mixture.
B can avoid the structure of aged asphalt to send out into variation, is applicable to modified bitumen.
C mainly shows the character that hardening becomes fragile after the ageing of asphalt, this method wants to estimate out accurately the change of properties of aged asphalt in the waste asphalt concrete, reduces test error, avoids it to receive breeze, the influence of extraction solvent etc.
D, test method is simpler, and equipment requirements is not high, and operating process is easy, and the core test is got at the scene of being convenient to, and is beneficial to test method and promotes.
Summary of the invention
Technical matters: the technical matters that the present invention will solve provides aged asphalt performance test methods in a kind of waste asphalt concrete; Can estimate the degree of aging of waste asphalt concrete medium pitch more exactly; Can obtain the sclerosis embrittlement situation of aged asphalt simply and easily; Can eliminate the asphalt performance variation that the structural change of test process medium pitch and other factor cause, testing equipment is less demanding simultaneously, is applicable to modified bitumen.
Technical scheme: for solving the problems of the technologies described above, the technical scheme that the present invention adopts is:
Step 1: bore the road surface structare layer core that core is fetched needs regeneration from the scene, core is cut, the test specimen after requiring to cut is a right cylinder bituminous concrete test specimen, and its diameter is 150mm ± 2.0mm, highly is 40～60mm ± 2.0mm; And guarantee that two end faces of this test specimen are parallel to each other and level;
Step 2: the core heated that the scene is fetched also is dispersed to less agglomerate, and avoid aggregate crusher, measures the bitumen aggregate ratio of asphalt with firing method or extraction process, and removes pitch and keep and gather materials; With the bitumen aggregate ratio identical and grating with former road surface core with old gather materials with reengineer in used pitch mix moulding gyratory compaction test specimen and guarantee that institute's shaping test piece porosity is identical with the road surface core; This test specimen is cut; Make its size identical, be standard specimen with right cylinder bituminous concrete test specimen;
Step 3: right cylinder bituminous concrete test specimen, standard specimen are placed the constant temperature air bath of regulation, meet the requirements of test temperature until bituminous concrete test specimen internal temperature; Open testing machine, make the environment temperature case meet the requirements of test temperature; Wherein test temperature is 10 ℃;
Step 4: centralising device is put into the circular hole of the base of loading equipemtn, cushion block is placed on the base and the centralising device exposed portions serve is inserted in the groove of cushion block so that a whole set of mould centering; The hollow circuit cylinder mould is placed cushion block top; Make the hollow circuit cylinder mould be enclosed within the prominence on cushion block top; Vaseline or other lubricant evenly are applied between the first annular rubber film and the second round rubber film two-layer, the first annular rubber film is placed on the hollow circuit cylinder mould;
Step 5: displacement transducer is placed first mould, and the circular hole that makes data line pass through hollow circuit cylinder mould (3) sidewall links to each other propulsion system with data acquisition system (DAS);
Step 6: the bituminous concrete test specimen is taken out from constant temperature air bath, be placed in the symmetrical cylindrical shape first mould top immediately and guarantee coincident; Simultaneously the load pressure head is put in the standard specimen top center, places second rubber film in the middle of standard specimen and the pressure head, smear one deck vaseline in the middle of the film equably;
Step 7: the axial static pressure load that utilizes power-equipment to apply to increase with given pace is on pressure head; And axle pressure, the vertical displacement of standard specimen and the related data of load time of utilizing the data acquisition system (DAS) record to load, test ambient temperature remains on 10 ℃ in the process of the test.
Test specimen insulation under the temperature that the experimenter sets at least 2 hours.
A whole set of mould palpus centering, and rubber diaphragm can not be too thick, scribbles lubricating oil between the rubber film.
The load of said step 7 applies mode: propulsion system apply the axial static pressure that increases with given pace through pressure head to test specimen.
Beneficial effect: the performance test methods of aged asphalt is through the mixture performance test in the waste asphalt concrete provided by the invention, the performance variation of reflection aged asphalt.At first, this method can accurately be estimated out sclerosis, the embrittlement degree of aged asphalt in the waste asphalt concrete, can accurately reflect aged asphalt character.Secondly, the asphaltic nature that this method has been avoided causing owing to effect of factors such as solvent, breeze, heat time heating times in the drawer removal process changes, and has reflected the character of aged asphalt in original road surface really and can be applicable to modified bitumen.Once more, the preparation of aged asphalt compound test specimen adopts the road surface to bore core and cutting, and the preparation of standard specimen is adopted and old gathering materials added the mode of new pitch, and material source is simple and easy to do.At last, test method is simpler, and equipment requirements is not high, and operating process is easy, and the core test is got at the scene of being convenient to, and is beneficial to test method and promotes.
Description of drawings
Fig. 1 is various accessory combination synoptic diagram.
Have among the figure: pressure head 1; Right cylinder bituminous concrete test specimen 2, standard specimen 2 '; Hollow circuit cylinder mould 3; Cushion block 4; Centralising device 5; Propulsion system 6; Displacement transducer 7; Data acquisition system (DAS) 8; The first annular rubber film 9; The second round rubber film 10.
Embodiment
The mentality of designing of asphalt concrete shearing performance test method provided by the invention is, through estimating the performance of aged asphalt compound, the performance of reflection aged asphalt.When parameters such as the bitumen aggregate ratio of bitumen mixture specimen, grating, porosity are identical and have only pitch not simultaneously, the character of bitumen mixture specimen is promptly represented the character of pitch.Its characteristic mainly shows as hardening and becomes fragile after the ageing of asphalt, therefore, should be able to reflect the sclerosis and the embrittlement degree of aged asphalt to the test of bitumen mixture specimen.Aged asphalt compound test specimen is applied dead load by a certain loading speed, and when test temperature was 10 ℃, the destruction of bituminous concrete test specimen was brittle rupture.The ageing of asphalt degree is serious more, and the asphalt hardening degree is high more, and the load when bitumen mixture specimen destroys is big more; Pitch embrittlement degree is high more, and the vertical deformation of bitumen mixture specimen is big more.No matter use firing method test or extraction test; The old relatively easy and old stable in properties of gathering materials of gathering materials that from waste asphalt mixture, obtains; Therefore; Can be with the old new pitch mix that institute will add when gathering materials with regeneration that obtains, as standard specimen, parameters such as the bitumen aggregate ratio of assurance standard specimen, grating, porosity are identical with aged asphalt compound test specimen with gyratory compaction test moulding.Vertical deformation when load is with destruction during the destruction of contrast aged asphalt compound test specimen and standard specimen can reflect the sclerosis and the embrittlement degree of aged asphalt.Through such test design, can reach the purpose of following two aspects:
1. through estimating the character that the character of boring the bitumen mixture specimen of core acquisition from the road surface reflects the road surface medium pitch; Can avoid in the conventional method aged asphalt character being changed, can avoid causing evaluation result inaccurate because of residual solvent and breeze because extracting is reclaimed.Intensity through relatively aged asphalt compound test specimen and standard specimen and the hardening that vertical deformation the obtains aged asphalt degree that becomes fragile.
2. old acquisition of gathering materials is more much easier than the acquisition of old pitch, and oldly gathers materials more stablely, and aged asphalt compound test specimen directly bores core from the road surface and obtains, and the aspect, source of material is easier and accurate than conventional method.Method of testing is simple and easy to do, has avoided the complicated and operation consuming time of extracting removal process, and is not high to equipment requirements, is convenient to promote.
In the preparation of test specimen:
Reasonably can eliminate size effect during sample dimensions, according to The experimental results, the minimum sample dimensions that can eliminate the asphalt size effect is the size that is not less than 3 times of asphalt nominal maximum particle diameters.According to present the most frequently used asphalt mixture gradation type AC13, AC20 and AC25,, do not wait the test specimen height so being 40～60mm.The compound of standard specimen is old gathering materials to add new pitch used when regenerating, and through gyratory compaction test moulding, moulding highly is 160～170mm behind the mix, so that cutting obtains 2～3 parallel test specimens.Concrete shop experiment job step is:
1. aged asphalt concrete sample 2 is cylindrical, bore core through the road surface and obtain, and core diameter 150mm ± 2.0mm, with the core cutting, making it highly is 40～60mm ± 2.0mm.The size of standard specimen is identical with the aged asphalt concrete sample, at first obtains old gathering materials through firing method or extraction test, and with new pitch mix used in the reengineer, grating and the bitumen aggregate ratio of controlling this compound are identical with the aged asphalt concrete; According to mix in " asphalt concrete construction technical manual " and moulding requirement, through the gyratory compaction shaping test piece, control gyratory compaction height (can confirm through calculating and pressure testing) makes the porosity of test specimen identical with aged asphalt concrete sample 2.This test specimen is cut, make its height identical, promptly obtain standard specimen 2 ' with aged asphalt concrete sample 2.
2. cut surface should be perpendicular to the side of bituminous concrete test specimen.It is qualified test specimen that the cut surface ruling grade is no more than 1% test specimen, otherwise need utilize the sanding machine polishing to meeting the requirements, and the cut surface ruling grade surpasses 2% test specimen and is not useable for test.The parallel test specimen of every group of test is no less than 3.
3. the maximum particle diameter of gathering materials of asphalt should be not more than 26.5mm.
Aspect measuring instrument tool and material:
1. Material Testing Machine, but the ground surface material testing equipment of other load applications and test distortion also can use, but must satisfy following condition:
(a) power-equipment (6) can be by certain loading speed load application, satisfies the required peak load of experimenter and should satisfy and be no more than 80% of its range, and be not less than 20% requirement of range.Testing machine should have the dress system of waiing upon, can control loaded power at loading procedure, guarantee that loading force can increase with a constant rate of speed in loading procedure, and general controlled loading force scope is that 0kN～25kN minimum division value is 10N.
(b) load pressure head 1, should be steel material, hollow circuit cylinder mould 3; Cushion block 4; Centralising device 5; Propulsion system 6 can be steel material or aluminum alloy materials.
(c) has the environment insulation can, 0.5 ℃ of temperature control accuracy, at least 70 ℃ of temperature-control range maximal values;
(d) deformation measuring device 7 is vertical displacement sensor, requires to measure deformation accuracy and is at least 0.1mm, and range is greater than the test piece deformation amount of estimating, and general range 5mm is enough.
2. data acquisition system (DAS) 8: can gather the electromotive signal of load transducer and displacement transducer automatically, in data acquisition system (DAS), store or on X-Y recorder, draw the relation curve of load application and vertical deformation.When testing machine has the measuring instrument of automatic mensuration load and vertical deformation, can directly use, needn't be equipped with deformation measuring device in addition, be at least 0.1mm but require to measure deformation accuracy, range is greater than the test piece deformation amount of estimating, and general range 5mm is enough.
3. constant temperature oven: be used to be incubated test specimen, the scalable temperature range should be able to satisfy testing requirements, and the temperature control degree is ± 0.5 ℃, should have air circulation system.
4. i.e. first rubber film 9, second rubber film 10 of bilayer film rubber blanket is polyester material or similar material, and its thickness can not excessive influence and the vertical load measuring accuracy.Smear vaseline or other lubricants between the two-layer rubber blanket, avoid producing transverse force between right cylinder bituminous concrete test specimen 2 and standard specimen 2 ' and the hollow circuit cylinder mould.
Should satisfy following condition aspect method of testing and the step:
1, preliminary work:
1. make test specimen on request, test parallel test specimen for every group and be no less than 3, measure and write down the height and the diameter of test specimen simultaneously, average, and need satisfy the given size requirement.Each test specimen must utilize density measuring method measurement test specimen density in " highway engineering pitch and asphalt testing regulations " (JTJ 052-2000) simultaneously; And the calculating voidage, and make aged asphalt right cylinder bituminous concrete test specimen 2 identical with standard specimen 2 ' porosity.
2. right cylinder bituminous concrete test specimen 2 is placed more than the stable constant temperature air bath 4h of regulation, till right cylinder bituminous concrete test specimen 2 and standard specimen 2 ' internal temperature meet the requirements of test temperature ± 0.5 ℃.Right cylinder bituminous concrete test specimen 2 and standard specimen 2 ' should be placed on the sheet glass propped or the plank or the sheet metal of surfacing during insulation, and the distance between the test specimen should be not less than 10mm, and air bath should have the air circulation system support.
3. 30min before the test opens testing machine, opens temperature control system, makes its environment temperature case meet the requirements of test temperature.
4. with hollow circuit cylinder mould 3; Cushion block 4; Centralising device 5; Be put on the testing table in order, and centering.Vaseline or other lubricants evenly are applied between first rubber film 9, second rubber film 10 two-layer, first rubber film 9 is placed on the hollow circuit cylinder mould and guarantees justified margin, displacement transducer is placed in the hollow circuit cylinder mould.
2, testing procedure
1. bituminous concrete test specimen 2 is taken out from constant temperature air bath; Be placed in immediately on the hollow circuit cylinder mould 3 that has been placed with rubber film; The cylinder anchor clamps 1 that will be placed with bituminous concrete test specimen 2 then place on the testing table; And pressure head 1 placed test specimen upper surface center, place second rubber film 10 between pressure head 1 and the test specimen.As occurring sticking couplet situation between the double-layer rubber film, then should continue coating lubricating oil and make it keep lubricated in the process of the test.
2. vertical displacement sensor 7 is linked to each other with data acquisition system (DAS) 8.If experiment loading unit has the function of automatic measurement vertical deformation, this step is omitted.
3. start power-equipment, apply dead load with certain speed and destroy until test specimen.
4. utilize data acquisition system (DAS) 8 to be recorded in load and apply in the test specimen destructive process, the vertical deformation of test specimen and load size.Require the data acquisition precision to do, the time is accurate to 0.1s, and vertical deformation is accurate to 0.1mm.
3, test principle
Proof can reflect the performance of its medium pitch through the performance test of bituminous concrete test specimen:
The material composite theory is regarded as a multiphase system with compound substance, and composite property is followed certain law of mixtures equation, like compound rule:
In the formula: K
c---performance of composites;
K
i---component material i and K
cCorresponding performance;
φ
i---the volumetric parameter of component material i;
N---complex effect constant.
Shown in above-mentioned formula, when other materials character in the compound substance was fixed and changed wherein a kind of material, performance of composites depended on the material property of this variation, and promptly the Changing Pattern of composite property is consistent with the performance variation law of this kind material.In the bituminous concrete test specimen, when grating, bitumen aggregate ratio, porosity etc. were consistent, concrete performance variation depended on the variation of asphalt performance, promptly can reflect the performance variation of pitch through the performance test of bituminous concrete.
Claims (3)
1. a bituminous concrete ageing properties method of testing is characterized in that this method of testing comprises the steps:
Step 1: bore the road surface structare layer core that core is fetched needs regeneration from the scene, core is cut, the test specimen after requiring to cut is a right cylinder bituminous concrete test specimen (2), and its diameter is 150mm ± 2.0mm, highly is 40 ~ 60mm ± 2.0mm; And guarantee that two end faces of this test specimen are parallel to each other and level;
Step 2: the core heated that the scene is fetched also is dispersed to less agglomerate, and avoid aggregate crusher, measures the bitumen aggregate ratio of asphalt with firing method or extraction process, and removes pitch and keep and gather materials; With the bitumen aggregate ratio identical and grating with former road surface core with old gather materials with reengineer in used pitch mix moulding gyratory compaction test specimen and guarantee that institute's shaping test piece porosity is identical with the road surface core; This test specimen is cut; Make its size identical, be standard specimen (2 ') with right cylinder bituminous concrete test specimen (2);
Step 3: right cylinder bituminous concrete test specimen (2), standard specimen (2 ') are placed the constant temperature air bath of regulation, meet the requirements of test temperature until right cylinder bituminous concrete test specimen (2), standard specimen (2 ') internal temperature; Open testing machine, make the environment temperature case meet the requirements of test temperature; Wherein test temperature is 10 ℃;
Step 4: centralising device (5) is put into the circular hole of the base of loading equipemtn, cushion block (4) is placed on the base and centralising device (5) exposed portions serve is inserted in the groove of cushion block (4) so that a whole set of mould centering; Hollow circuit cylinder mould (3) is placed cushion block (4) top; Make hollow circuit cylinder mould (3) be enclosed within the prominence on cushion block (4) top; Vaseline or other lubricant evenly are applied between the first annular rubber film (9) and the second round rubber film (10), the first annular rubber film (9) is placed on the hollow circuit cylinder mould (3);
Step 5: displacement transducer (7) is placed hollow circuit cylinder mould (3), the data line of propulsion system (6) circular hole through hollow circuit cylinder mould (3) sidewall is linked to each other with data acquisition system (DAS) (8);
Step 6: right cylinder bituminous concrete test specimen (2) is taken out from constant temperature air bath, be placed in hollow circuit cylinder mould (3) top immediately and guarantee coincident; Simultaneously load pressure head (1) is put in right cylinder bituminous concrete test specimen (2) top center, right cylinder bituminous concrete test specimen (2) and the middle second round rubber film (10) of placing of pressure head (1) are smeared one deck vaseline equably in the middle of the film;
Step 7: the axial static pressure load that utilizes power-equipment (6) to apply to increase with given pace is on pressure head (1); And axle pressure, the vertical displacement of right cylinder bituminous concrete test specimen (2) and the related data of load time of utilizing data acquisition system (DAS) (8) record to load, test ambient temperature remains on 10 ℃ in the process of the test.
Step 8: intensity through relatively aged asphalt compound test specimen and standard specimen and the hardening that vertical deformation the obtains aged asphalt degree that becomes fragile.
2. bituminous concrete ageing properties method of testing as claimed in claim 1 is characterized in that, test specimen insulation under the temperature that the experimenter sets at least 2 hours.
3. bituminous concrete ageing properties method of testing as claimed in claim 1 is characterized in that, a whole set of mould palpus centering scribbles lubricating oil between the rubber film.
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| CN102507315A (en) * | 2011-10-14 | 2012-06-20 | 东南大学 | Testing device and testing method for ageing performance of asphalt mixture |
| CN102728095A (en) * | 2012-06-20 | 2012-10-17 | 江苏山水建设集团有限公司 | Recovering method of asphalt in asphalt mixture |
| CN103344473A (en) * | 2013-07-15 | 2013-10-09 | 东南大学 | Method for molding asphalt mixture specimen for test by using rotary compaction method |
| CN105758732B (en) * | 2016-03-24 | 2018-05-08 | 北京盛广拓公路科技有限公司 | A kind of cold renewal scene core sample Strength Testing Methods |
| CN108760615B (en) * | 2018-03-07 | 2024-04-16 | 宁夏大学 | Asphalt concrete tester simulating natural conditions |
| CN108535104A (en) * | 2018-03-20 | 2018-09-14 | 苏州市信测标准技术服务有限公司 | A kind of rubber synthesis aging testing method |
| CN108646007B (en) * | 2018-04-17 | 2020-07-24 | 东南大学 | Test evaluation method for caking characteristic of recycled old material of asphalt pavement |
| CN110514559A (en) * | 2019-08-30 | 2019-11-29 | 中国航发动力股份有限公司 | A kind of abrasive Flow abrasive material viscosity matching measurement device and measurement method |
| CN113514347B (en) * | 2021-05-14 | 2023-05-19 | 长安大学 | In-situ shearing test device and method in hole |
| CN113092312A (en) * | 2021-06-09 | 2021-07-09 | 长沙理工大学 | Evaluation method for aging gradient behavior of SBS modified asphalt |
| CN114965168B (en) * | 2022-05-23 | 2023-05-16 | 东北林业大学 | Test instrument and method for evaluating physical hardening of asphalt |
| CN116103978B (en) * | 2023-02-16 | 2024-05-03 | 滨州市公路勘察设计院有限公司 | Aged asphalt regenerating unit based on used engine oil |
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| CN100561178C (en) * | 2007-07-13 | 2009-11-18 | 东南大学 | Asphalt concrete elevated temperature property testing method |
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Inventor after: Zhao Yongli Inventor after: Ma Tao Inventor after: Wang Zhen Inventor after: Yan Zheng Inventor before: Zhao Yongli Inventor before: Wang Zhen Inventor before: Huang Xiaoming |
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