CN104749239A - Asphalt mixture surface crack monitoring method - Google Patents
Asphalt mixture surface crack monitoring method Download PDFInfo
- Publication number
- CN104749239A CN104749239A CN201510144503.0A CN201510144503A CN104749239A CN 104749239 A CN104749239 A CN 104749239A CN 201510144503 A CN201510144503 A CN 201510144503A CN 104749239 A CN104749239 A CN 104749239A
- Authority
- CN
- China
- Prior art keywords
- test specimen
- test
- galvanic circle
- monitoring method
- computer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses an asphalt mixture surface crack monitoring method. An asphalt mixture surface crack monitoring device comprises a conducting material, leading-out sheets, a conductor, a data acquiring device and a computer. The conducting material is coated on a test-piece surface to form an unclosed conducting loop, the leading-out sheets are respectively connected with the unclosed conducting loop and the conductor at two ends of the unclosed conducting loop, and then accessed into the data acquiring device and communicated with the computer to form an electrified loop, the data acquiring device is used for real-time monitoring the surface crack of the test-piece through the on-off of the circuit and displaying on the computer. The device and method disclosed by the invention have the characteristics of being high in sensitivity, available under a complex condition, low in cost and convenient for popularization and application, the problems that the existing test device and method are complex in operation, expensive in instrument, inconvenient for use under a complex condition, and limited in use range are solved; and the method has important significance for researching road material mechanical property and preventing pavement structure damage.
Description
Technical field
The invention belongs to field of road, be specially a kind of asphalt surface crack monitoring method.
Background technology
Since reform and opening-up, highway be always China's year dynamics of investment maximum, with the fastest developing speed focus the consruction on field; By the end of the year 2014, China will build the highway be open to traffic and will breach 100,000 kilometers.According to development plan, in the after this more than ten years, also want newly-built tens thousand of kilometers of highways and gigameter common road, more have several a large amount of bituminous pavement to need repairing transformation.
China, in highway construction practice, have accumulated rich experience, solves many key technical problems.But from the highway behaviour in service put into effect in recent years, major part does not reach and has namely occurred more serious function decay and structural failure tenure of use, many design periods are the pavement structure of 15 years, namely occur in 5 ~ 8 years destroying on a large scale after open to traffic, cause huge economic loss and bad social influence.
When studying surface feature decay and structural failure, determine that destruction source is crucial.And field measurement is comparatively complicated, need human and material resources and the financial resources of at substantial, and higher to the requirement of instrument and equipment.Therefore, road work person devises series of indoor mechanical test, as direct tensile test, bending test, uniaxial compression test, diametral compression test, asphalt triaxial test carry out certain stress of simulated roadway structure, and judged the mechanical property of ground surface material by the intensity level measured.Under normal circumstances, when carrying out indoor intensity test, the destruction of test specimen can be defined with the appearance of ultimate bearing capacity or initial crack.To the difference destroying definition, by causing, the intensity of material is different.Such as in asphalt bending test, test specimen ftractures at first bottom span centre.If destroy with Initial Cracking definition, the intensity recorded destroys with ultimate bearing capacity definition the intensity recorded by being less than.And strength of materials value is different, the design of pavement structure can be affected again significantly.
At present, road scientific research personnel adopts the method for pasting foil gauge to judge the generation of surface crack usually.But, when surface of test piece is complex-shaped or space is comparatively narrow and small, is difficult to paste foil gauge, governs the usable range of foil gauge.As asphalt triaxial test adopts overall diameter to be 100mm, interior diameter is 20mm, height is 100mm hollow circular cylinder test specimen, if will judge that test specimen still destroys at outer cylinder surface at inner periphery at first, will paste foil gauge at inner periphery and outer cylinder surface simultaneously.Obviously, it is comparatively difficult that the hollow cylinder intrados being 20mm at interior diameter pastes foil gauge.In addition, in engineer applied, be also not easy to adopt foil gauge test in the corner of structure.In recent years, in order to detect generation, the rule of development of specimen crack, road researchist brings into use CT scan technology, is obtained the image of test specimen section by CT scan imaging.But CT pilot system is expensive, complicated operation, spend millions of unit easily, be difficult to apply.In addition, mostly CT scan is that the test specimen before destruction and after destroying is put into industry CT to be scanned, and is difficult to the Real-Time Monitoring realized in process of the test.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art provide a kind of highly sensitive, simple, be convenient to promote, be suitable for Load materials and foil gauge test and the asphalt surface crack monitoring method of CT scan defect can be overcome.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of asphalt surface crack monitoring method, comprises the following steps:
S100, surface of test piece process, and make its surface keep smooth, closely knit;
S200, the conductive material selecting a kind of extensibility close with test specimen, spread upon the surface of test specimen uniformly by groove, form the not loop of conduction;
S300, formation galvanic circle; Lead-out tablet is placed on the two ends not closing galvanic circle, what formed with described conductive material respectively does not close galvanic circle and is connected rear access data harvester and computer with described wire, forms galvanic circle;
The connected state of S400, inspection galvanic circle, open data collector and computer, whether check circuit is in connected state; If be in connected state, just can test; Otherwise, check galvanic circle, till circuit is in connected state;
S500, test specimen to be tested, if surface of test piece occur crack, galvanic circle will disconnect, connection data collector computer will accurately real time record circuit disconnection time, this time is the cracking time of surface of test piece, thus realizes the Real-Time Monitoring to surface of test piece crackle.
Accompanying drawing explanation
Fig. 1 is periphery establishes schematic diagram for not closing conduction, and wherein (a) represents that not closing conduction is periphery and establishes front elevational schematic, and (b) represents that not closing conduction is periphery and establishes schematic top plan view;
Fig. 2 is planar compression/axial compression test curve and surface of test piece cracking time.
Embodiment
The present invention is illustrated below in conjunction with accompanying drawing 1 to Fig. 2 and further detailed description in detail.It is pointed out that following explanation is only illustrating the technical scheme that application claims is protected, any restriction not to these technical schemes.The content that protection scope of the present invention is recorded with appended claims is as the criterion.
A kind of asphalt surface crack monitoring method, comprises the following steps:
S100, surface of test piece process, and make its surface keep smooth, closely knit;
S200, the conductive material selecting a kind of extensibility close with test specimen, spread upon the surface of test specimen uniformly by groove, form the not loop of conduction;
S300, formation galvanic circle; Lead-out tablet is placed on the two ends not closing galvanic circle, what formed with described conductive material respectively does not close galvanic circle and is connected rear access data harvester and computer with described wire, forms galvanic circle;
The connected state of S400, inspection galvanic circle, open data collector and computer, whether check circuit is in connected state; If be in connected state, just can test; Otherwise, check galvanic circle, till circuit is in connected state;
S500, test specimen to be tested, if surface of test piece occur crack, galvanic circle will disconnect, connection data collector computer will accurately real time record circuit disconnection time, this time is the cracking time of surface of test piece, thus realizes the Real-Time Monitoring to surface of test piece crackle.
Preferably, in S100, described test specimen be through static pressure or gyratory compaction molding diameter be 100mm, the high asphalt right cylinder for 100mm, be 100mm to obtaining overall diameter after described asphalt right cylinder test specimen core boring sampling again, interior diameter is 20mm, and height is 100mm asphalt hollow circular cylinder test specimen; The position of described test specimen inside and outside circle damaged surface height 20mm, 40mm, 60mm, 80mm has width to be the datum line of 0.6mm, is convenient to smear conductive material, also can makes datum line in other positions as required.
Preferably, in s 200, the close conductive material of a kind of and described test specimen extensibility is selected to be that the groove uniform application of 0.6mm is in the position of test specimen inside and outside circle damaged surface height 20mm, 40mm, 60mm, 80mm by width, form multiple first and do not close galvanic circle, simultaneously, between test specimen upper surface internal diameter and external diameter, smear conductive material, form the second galvanic circle do not closed; Described conductive material is low temperature normal temperature cure conductive silver glue, and its constituent is mainly silver powder, and mass percent is about 80%; Other components are resin, promoter, hardening agent and thinning agent etc., add up to mass percent to be about 20%.It is low that this conductive silver paste has solidification temperature, easily the feature of bonding, electric performance stablity.Well can be attached to surface of test piece, and solidify faster.Specifically consist of: flake silver powder 80%, organic resin 8%, thinning agent 6%, hardening agent 4% and curing accelerator 2%; To be particle diameter the be flake silver powder of 0.1 ~ 4 μm, purity >=99.9% of flake silver powder wherein.Above-mentioned organic resin is polyacrylic resin, and thinning agent is 2-Butoxyethyl acetate, and hardening agent is 1-cyanoethyl-2-phenylimidazole, and curing accelerator is 4,4-diaminobenzene methylimidazole.
Preferably, in S400, described data collector has 16 independently test channel, and each test channel has independently power supply, and test channel quantity can continue expansion.
Preferably, in S500, in described hollow cylinder test specimen, insert interior air bag, then vertical load is applied by MTS Material Testing Machine, loading velocity is 2mm/min, makes test specimen inside surface be in plane tension and compression/axial compression stress, until test specimen destroys.The make-and-break time of the described closed galvanic circle gathered can be as accurate as 0.01 second.
Adopt a monitoring device for said method, it comprises conductive material, lead-out tablet, wire, data acquisition system (DAS) and computer.The extensibility of described conductive material should close to the extensibility of test specimen, and conductive material spreads upon the surface of test specimen equably by the groove of customization; Described have 16 independently test channel according to harvester, and each passage has independently power supply, and port number can continue expansion, has strong interference immunity, highly sensitive feature; Described conductive material is connected with computer with lead-out tablet, wire, data collector in turn by the two ends not closing conducting ring all formed, form galvanic circle, after turn-on data harvester and computer, the time disconnected by circuit, judge the cracking of surface of test piece.
The most basic embodiment of the present invention is to propose a kind of asphalt surface crack monitoring device, comprises test specimen, lead-out tablet, wire, data collector and computer; Smear conductive material at described test specimen outside surface and form multiple first not closed galvanic circle; Meanwhile, between test specimen upper surface internal diameter and external diameter, smear conductive material, form the one or more second galvanic circle do not closed; Described lead-out tablet is positioned at does not close the two ends of galvanic circle, is connected to form conductive path by wire and data collector and computer; Finally, the generation of crackle is judged by the break-make of conductive path.
Embodiment 1
Below for asphalt plane tension and compression/axial compression test, introduce and how to use Load materials surface crack monitoring device and method to judge the cracking of surface of test piece:
(1) static pressure or gyratory compaction molding diameter are 100mm, the high right cylinder bitumen mixture specimen for 100mm, and obtaining overall diameter after core boring sampling is 100mm, and interior diameter is 20mm, and height is 100mm hollow circular cylinder test specimen.
(2), after polishing process being carried out to surface of test piece, make a mark at test specimen inside surface and outside surface height 20mm, 40mm, 60mm, 80mm place picture horizontal line respectively.
(3) a kind of conductive material close with test specimen extensibility or conducting solution (as conductive silver) is selected, be the groove of 0.6mm by width, uniform application, in the position of test specimen inner periphery and outer cylinder surface height 20mm, 40mm, 60mm, 80mm, forms multiple conductive ring do not closed.Meanwhile, between test specimen upper surface internal diameter and external diameter, smear conductive material, form a conductive ring do not closed, as shown in Figure 1.
(4) lead-out tablet, wire, data collector and computer is connected in turn at the conductive ring two ends do not closed.Each passage not closing conductive ring access data harvester is connected with computer, and turn-on data acquisition system and computer, form a power circuit.
(5) check whether power circuit occurs open circuit.If there is open circuit, adopt the break-make of multimeter test circuit piecemeal; Check lead-out tablet and the conductive ring do not closed and wire whether compact siro spinning technology; Till conductive ring, lead-out tablet, wire, data collector and the computer do not closed form power circuit.
(6) by hollow cylinder test specimen 15 DEG C temperature control box inside holding 6 hours with, and in the assembling of test specimen inner chamber the constant air pressure of the after-applied 0.5MPa of air bag, then vertical load is applied by MTS Material Testing Machine, loading velocity is 2mm/min, test specimen inside surface is made to be in plane tension and compression/axial compression stress, until test specimen destroys, and record the make-and-break time of each galvanic circle.By MTS Material Testing Machine obtain test specimen load time-curves of stress-strain relationship, by the cracking time gauge point of the test specimen inside surface of Load materials surface crack monitoring device record, upper surface, outside surface on trial curve, obtain Fig. 2.
(7) as can be seen from Figure 2, some A is the time that crackle appears in test specimen inside surface, is 63.81 after on-test second; Point B is the time that crackle appears in test specimen upper surface, is 64.47 after on-test second; Point C is the time that crackle appears in test specimen inside surface, is 65.53 after on-test second.That is, in asphalt plane tension and compression/axial compression test, there is crackle in test specimen inside surface at first; Along with the increase of load, crackle is expanded rapidly from inside to outside, destroys until test specimen loses load-bearing capacity.
(9) stress state of test specimen inside surface corresponding for A time point is defined as the ultimate strength of material, obtains the plane tension and compression/axial compression strength (σ of asphalt
1, σ
2, σ
3) be (0.542MPa ,-0.5MPa ,-5.414MPa).
Whether destroy at inside surface at first under the combined action of interior air bag and vertical load to prove hollow cylinder test specimen, carried out corresponding mcta analysis: Li Jianlin to external diameter be 220mm, internal diameter is 100mm, the high hollow cylinder test specimen for 250mm has carried out three axial compressions-pressure-tensile strength and tested.He is by pasting foil gauge to test specimen inside surface and outside surface, be aided with the method that Acoustic radiating instrument differentiates incipient crack, draw under the acting in conjunction of chamber pressure and axial stress, cylinder test specimen is at first from the conclusion of inside surface cracking, and this is consistent with the test findings adopting Load materials surface crack monitoring method to obtain.
But if asphalt adopts large scale test specimen to test, required vertical load will, more than MTS Material Testing Machine range, will cause test to be difficult to carry out; And adopting overall diameter to be 100mm, interior diameter is 20mm, and high is that 100mm hollow circular cylinder test specimen is difficult to again by pasting foil gauge monitoring surface crack, and the present invention solves this technological deficiency well.If Load materials surface crack monitoring device and method are applied to pavement structure, can satisfy the need and show the crackle that occurs from top to down and carry out Real-Time Monitoring, this to research Load materials mechanical characteristic and pavement structure breakage and prevent significant.
In sum, the invention solves the problem that traditional foil gauge test usable range is limited; Overcome CT scan complicated operation, testing equipment expensive, be difficult in process of the test Real-Time Monitoring, be difficult to the shortcoming applied.The present invention forms power circuit by the conductive material of surface of test piece, lead-out tablet, wire, data acquisition system (DAS) and computer, generation, the rule of development of surface crack is judged by the break-make of circuit, have simple, with low cost, highly sensitive, be applicable to complex conditions, can Real-Time Monitoring, feature easy to utilize, significant to the mechanical characteristic of research Load materials, the destruction source finding pavement structure and pavement structure breakage and prevent.
Embodiment 2
Conductive silver glue of the present invention completes according to following processing step:
First following raw material is prepared according to mass percent:
Flake silver powder 80%, organic resin 8%, thinning agent 6%, hardening agent 4% and curing accelerator 2%; To be particle diameter the be flake silver powder of 0.1 ~ 4 μm, purity >=99.9% of flake silver powder wherein.Above-mentioned organic resin is polyacrylic resin, and thinning agent is 2-Butoxyethyl acetate, and hardening agent is 1-cyanoethyl-2-phenylimidazole, and curing accelerator is 4,4-diaminobenzene methylimidazole.
The preparation method of curing conductive elargol is as follows:
1) weighing particle diameter first is by mass percentage 0.1 ~ 4 μm, and the flake silver powder of purity >=99.9% is stand-by;
2) weigh organic resin and thinning agent by aforementioned mass percent, heat under 60 DEG C of conditions, after resin dissolves completely, be cooled to room temperature stand-by;
3) aforesaid flake silver powder is joined in the potpourri of organic resin and thinning agent, add hardening agent and curing accelerator, carry out mixing with colloid mill and pulverize, controlling rotating speed and the working time of colloid mill, until fineness is less than 5 μm obtain curing conductive elargol finished product.
Gained curing conductive elargol product is less than 0.1% with the extensibility deviation of pitch test material after testing; And in the detection application more than 500 times, after there is not conductive silver glue solidification, there is the situation in crack.
Above to method provided by the present invention, be described in detail, apply specific case herein and set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (7)
1. an asphalt surface crack monitoring method, comprises the following steps:
S100, surface of test piece process, and make its surface keep smooth, closely knit;
S200, the conductive material selecting a kind of extensibility close with test specimen, spread upon the surface of test specimen uniformly by groove, form the not loop of conduction;
S300, formation galvanic circle; Lead-out tablet is placed on the two ends not closing galvanic circle, what formed with described conductive material respectively does not close galvanic circle and is connected rear access data harvester and computer with described wire, forms galvanic circle;
The connected state of S400, inspection galvanic circle, open data collector and computer, whether check circuit is in connected state; If be in connected state, just can test; Otherwise, check galvanic circle, till circuit is in connected state;
S500, test specimen to be tested, if surface of test piece occur crack, galvanic circle will disconnect, connection data collector computer will accurately real time record circuit disconnection time, this time is the cracking time of surface of test piece, thus realizes the Real-Time Monitoring to surface of test piece crackle.
2. monitoring method according to claim 1, it is characterized in that, preferably, in S100, described test specimen be through static pressure or gyratory compaction molding diameter be 100mm, the high asphalt right cylinder for 100mm, be 100mm to obtaining overall diameter after described asphalt right cylinder test specimen core boring sampling again, interior diameter is 20mm, and height is 100mm asphalt hollow circular cylinder test specimen; The position of described test specimen inside and outside circle damaged surface height 20mm, 40mm, 60mm, 80mm has width to be the datum line of 0.6mm.
3. monitoring method according to claim 1, it is characterized in that, in s 200, the close conductive material of a kind of and described test specimen extensibility is selected to be that the groove uniform application of 0.6mm is in the position of test specimen inside and outside circle damaged surface height 20mm, 40mm, 60mm, 80mm by width, form multiple first and do not close galvanic circle, meanwhile, between test specimen upper surface internal diameter and external diameter, smear conductive material, form the second galvanic circle do not closed.
4. monitoring method according to claim 3, is characterized in that, described conductive material is low temperature normal temperature cure conductive silver glue, and its constituent is flake silver powder 80%, organic resin 8%, thinning agent 6%, hardening agent 4% and curing accelerator 2%; To be particle diameter the be flake silver powder of 0.1 ~ 4 μm, purity >=99.9% of flake silver powder wherein.
5. monitoring method according to claim 4, is characterized in that, described in state organic resin be polyacrylic resin, thinning agent is 2-Butoxyethyl acetate, and hardening agent is 1-cyanoethyl-2-phenylimidazole, and curing accelerator is 4,4-diaminobenzene methylimidazole.
6. monitoring method according to claim 1, is characterized in that, in S400, described data collector has 16 independently test channel, and each test channel has independently power supply, and test channel quantity can continue expansion.
7. monitoring method according to claim 1, it is characterized in that, in S500, interior air bag is inserted in described hollow cylinder test specimen, then apply vertical load by MTS Material Testing Machine, loading velocity is 2mm/min, makes test specimen inside surface be in plane tension and compression/axial compression stress, until test specimen destroys, the make-and-break time of the described closed galvanic circle of collection can be as accurate as 0.01 second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510144503.0A CN104749239B (en) | 2015-03-30 | 2015-03-30 | A kind of asphalt face crack monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510144503.0A CN104749239B (en) | 2015-03-30 | 2015-03-30 | A kind of asphalt face crack monitoring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104749239A true CN104749239A (en) | 2015-07-01 |
| CN104749239B CN104749239B (en) | 2017-12-12 |
Family
ID=53589234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510144503.0A Active CN104749239B (en) | 2015-03-30 | 2015-03-30 | A kind of asphalt face crack monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104749239B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866006A (en) * | 2016-05-25 | 2016-08-17 | 中国石油天然气股份有限公司 | Tight sandstone crack detecting device and method |
| CN107894445A (en) * | 2017-10-30 | 2018-04-10 | 江阴市恒润重工股份有限公司 | A kind of flange available for end face of flange crack monitoring |
| CN107907409A (en) * | 2017-11-10 | 2018-04-13 | 中国地质大学（武汉） | A kind of method, equipment and the storage device of definite rock crack initiation stress |
| CN113447388A (en) * | 2021-06-29 | 2021-09-28 | 重庆市潼南区九橡化大环保科技有限公司 | Asphalt ductility instrument calibration test piece and preparation method and calibration method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2149045A1 (en) * | 1995-12-21 | 2000-10-16 | Univ Catalunya Politecnica | Direct traction test procedure applied to the characterisation of bituminous mixtures |
| CN1645119A (en) * | 2004-12-31 | 2005-07-27 | 福州大学 | Automatic testing method, apparatus and use for slit appear time |
| KR20050114571A (en) * | 2004-06-01 | 2005-12-06 | 허정도 | A penetration testing equipment, a property measuring method and a specimen preparation method for roadway pavement materials |
| CN101178340A (en) * | 2007-11-21 | 2008-05-14 | 长安大学 | Asphalt pavement reflection crack propagation analog experiment device |
| CN102775729A (en) * | 2011-05-13 | 2012-11-14 | 惠州市富济电子材料有限公司 | Conductive silver glue with raising yellowing resistance for blue LED and production technology thereof |
| CN103076238A (en) * | 2012-12-28 | 2013-05-01 | 长沙理工大学 | Testing device and method for bend-shear performance of asphalt mixture |
| CN103245542A (en) * | 2013-05-16 | 2013-08-14 | 东南大学 | Test method of compound cracking of asphalt mixture |
-
2015
- 2015-03-30 CN CN201510144503.0A patent/CN104749239B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2149045A1 (en) * | 1995-12-21 | 2000-10-16 | Univ Catalunya Politecnica | Direct traction test procedure applied to the characterisation of bituminous mixtures |
| KR20050114571A (en) * | 2004-06-01 | 2005-12-06 | 허정도 | A penetration testing equipment, a property measuring method and a specimen preparation method for roadway pavement materials |
| CN1645119A (en) * | 2004-12-31 | 2005-07-27 | 福州大学 | Automatic testing method, apparatus and use for slit appear time |
| CN101178340A (en) * | 2007-11-21 | 2008-05-14 | 长安大学 | Asphalt pavement reflection crack propagation analog experiment device |
| CN102775729A (en) * | 2011-05-13 | 2012-11-14 | 惠州市富济电子材料有限公司 | Conductive silver glue with raising yellowing resistance for blue LED and production technology thereof |
| CN103076238A (en) * | 2012-12-28 | 2013-05-01 | 长沙理工大学 | Testing device and method for bend-shear performance of asphalt mixture |
| CN103245542A (en) * | 2013-05-16 | 2013-08-14 | 东南大学 | Test method of compound cracking of asphalt mixture |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866006A (en) * | 2016-05-25 | 2016-08-17 | 中国石油天然气股份有限公司 | Tight sandstone crack detecting device and method |
| CN107894445A (en) * | 2017-10-30 | 2018-04-10 | 江阴市恒润重工股份有限公司 | A kind of flange available for end face of flange crack monitoring |
| CN107907409A (en) * | 2017-11-10 | 2018-04-13 | 中国地质大学（武汉） | A kind of method, equipment and the storage device of definite rock crack initiation stress |
| CN113447388A (en) * | 2021-06-29 | 2021-09-28 | 重庆市潼南区九橡化大环保科技有限公司 | Asphalt ductility instrument calibration test piece and preparation method and calibration method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104749239B (en) | 2017-12-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104749239A (en) | Asphalt mixture surface crack monitoring method | |
| CN203275401U (en) | Novel road soil engineering compaction rapid thickness measuring accommodometer | |
| Yiqiu et al. | Quality control of asphalt pavement compaction using fibre Bragg grating sensing technology | |
| Han et al. | Nickel particle-based self-sensing pavement for vehicle detection | |
| CN102345269B (en) | Rubber asphalt compacting technology based on pavement quality indicator | |
| CN105866382B (en) | For reinforcing the consolidation by electroosmosis experimental rig of Soft Clay Foundation and method | |
| Liu et al. | Self-monitoring application of conductive asphalt concrete under indirect tensile deformation | |
| CN103323537B (en) | Coupling device for realizing acquisition of acoustic emission signals in triaxial pressure cell | |
| CN106989995A (en) | A kind of adjustable Rock And Soil of lateral spacing condition vertically compresses ancillary test device | |
| CN211374759U (en) | Fiber concrete early-age shrinkage crack test device | |
| Cheng et al. | Development of a capacitive sensor for concrete structure health monitoring | |
| CN111236011A (en) | Road surface compaction quality monitoring system based on intelligent aggregate | |
| CN103335752A (en) | Remotely and dynamically surveying system and method for road pre-buried shear stress | |
| CN103364457A (en) | Real-time monitoring device and method for freezing-thawing damage of rock | |
| CN101246157A (en) | Asphalt concrete pavement stress-strain detecting method and system | |
| CN111982955A (en) | Unsaturated roadbed soil freeze-thaw cycle model test system | |
| CN203519527U (en) | Temperature field and heat conductivity coefficient tester applicable to multilayer pavement structure | |
| CN106840253B (en) | A kind of confined concrete arch steel reinforced concrete coupled characteristic evaluation method | |
| CN102967520A (en) | Method for measuring aggregate crushing value | |
| Zhang et al. | Experimental study of fracture geometry characteristics on rock mass strength and crack propagation evolution law | |
| CN111443190A (en) | Steel slag asphalt mixture volume expansion tester and test method | |
| CN106092728A (en) | The control method of each point three-dimensional stress in asphalt circle ring column test specimen | |
| Monteiro et al. | Carbon nanoparticles cement-based materials for service life monitoring | |
| CN105716954B (en) | Fracture pattern electricity monitoring method towards hydraulic fracturing simulation test | |
| Kim et al. | Non-destructive analysis of power insulators by frequency response function and three dimensional-computed tomography |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |