CN107560951A - Half-flexible pavement asphalt skeleton and cement mortar boundary strength method of testing - Google Patents
Half-flexible pavement asphalt skeleton and cement mortar boundary strength method of testing Download PDFInfo
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- CN107560951A CN107560951A CN201710760224.6A CN201710760224A CN107560951A CN 107560951 A CN107560951 A CN 107560951A CN 201710760224 A CN201710760224 A CN 201710760224A CN 107560951 A CN107560951 A CN 107560951A
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Abstract
The present invention provides a kind of half-flexible pavement asphalt skeleton and cement mortar boundary strength method of testing, belong to pavement material intensity technical field of measurement and test, solve the problems, such as that current test method is difficult to test half-flexible pavement asphalt skeleton and cement mortar interface mechanicses intensity.The present invention uses nano-indenter test method, makes half-flexible pavement test specimen by laboratory test first；Then, to half-flexible pavement according to tester require carry out test sample cutting process, and chosen material interfacial characteristics it is representative sample it is standby；Finally, impression test is carried out to sample characteristic interface using nano-hardness tester, obtains the mechanics parameters such as the hardness of material interface, modulus of elasticity, creep function, fracture toughness, interface binding power and characterize half-flexible pavement interface mechanicses strength characteristics.The present invention has easy feature directly perceived, extends to the evaluation of built pavement usage situation, and test parameter can dock with method for numerical simulation, promotes method for numerical simulation development.
Description
Technical field
The present invention is a kind of half-flexible pavement asphalt skeleton and cement mortar boundary strength method of testing, belongs to road
Plane materiel material strength test technical field.
Background technology
Half-flexible pavement is a kind of using open gradation Asphalt mix for open-graded friction course as matrix, and perfusion good fluidity, intensity are high
Special cement mortar and a kind of NEW TYPE OF COMPOSITE Pavement Structure formed.Half-flexible pavement has flexible pavement seamless, OK concurrently
The advantages of car comfortableness is high and the advantages of rigid pavement bearing capacity is strong, wear-resisting, good endurance.
Half-flexible pavement is because its making mode and constituent material are increasingly complex compared with prevailing roadway, its Strength Forming Mechanism
There is bigger difference with bituminous paving and cement pavement, wherein interface mechanical behavior is even more complexity.
The research of half-flexible pavement occurs abroad earliest, is used for the experiment of jetway, as heat-resisting road
Face carries out experiment making, and research confirms that half-flexible pavement can improve the high-temperature stability on road surface in the case of not increase expense
And prolonging service life of pavement.The country of China proceeds by half-flexible pavement research from the 1990s.1986, Tongji University was big
Learn professor Lin Xiuxian and presided over the problem of the parties concerned, and Experiment Road built on Guangdong Province's favour depth line in the end of the year then, pass through
The driving for spending 2 years uses, and works well.The mechanical strength research both at home and abroad to half-flexible pavement is mainly distributed on matrix at present
Three aspects of measure of the improvement of asphalt, the optimization of cement mortar and pavement performance.
Different from plain asphalt road surface, half-flexible pavement is on the basis of making Asphalt mix for open-graded friction course skeleton, again
The perfusion of cement mortar has been carried out, and has needed the health ability final molding of a period of time, this method makes half-flexible pavement
Overall structure is very closely knit.From rubber cement theory analysis, half-flexible pavement structure is a kind of multistage spacial framework system,
Slightly, in thin, micro- three-level dispersed system, formed with the Behavior of Hardened Cement Paste of the gel structure of asphalt mastic, cement mortar crystal and gel double
Weight network structure system, show very big compactness and higher c,Value, therefore have flexible and rigid material duality concurrently
Energy.Theoretical analysis method is analyzed the structural system of half-flexible pavement, but is limited to current progress, it is difficult to will be managed
Popularization proof is carried out by with actual combine.
Analyzed from microcosmic angle, pitch passes through pitch with hydrated cementitious intergranular mutually absorption and hydrated cementitious crystal
The combination of film and mineral aggregate is the distinctive interface constituted mode of half-flexible pavement, and cement can increase the gelinite quantity in pitch
Add, rubber cement compact structure is strengthened, and hydrated product is formed network structure with pitch in a manner of physical bond, and can make up mixing
Expect internal flaw and improve asphalt and aggregate adhesiveness.The analytical proof of micro-scale cement mortar and asphalt bone
There is increasingly complex combination between frame interface, but the specific mechanical strength size in interface can not be obtained.
Cement mortar with asphalt matrix after being combined, to the effect of being greatly improved of the intensity of structure in itself,
And as the interface portion between two kinds of materials, there is direct influence to the bulk strength of half-flexible pavement.Asphalt
Classical mechanics study method be mostly tested by Marshall, wheel tracking test the methods of carry out the experiments of macro-mechanical characters,
Pair still lack with the research of the mesomechanics of ground surface material and specific to characterize test method.
Macromechanics experiment is similar therewith, adhesion of pitch class material generally use water-boiling method or water seaoning evaluation pitch etc.
The boundary strength of asphalt material is reflected in level, side.This method is a kind of empirical method, can not obtain material interface in an experiment
The specific numerical value such as intensity, creep parameters, the at present acquisition of pitch class material interface intensity never have preferable method of testing.
Therefore, for half-flexible pavement asphalt skeleton and difficult cement mortar boundary strength test the problem of, this
Invention uses a kind of nano-indenter test method, by the evaluation to detecting location load and displacement relation in instrument test,
The data such as asphalt skeleton and cement mortar boundary strength, creep parameters are obtained, are that the boundary strength of pitch class material is surveyed
Examination provides a kind of new approaches.This new method can be applied in multiple material, and can be generalized to built pavement usage shape
In the evaluation of condition, there is important reference to research ground surface material boundary strength, there is application value.
The content of the invention
(1) technical problem
It is an object of the present invention to provide a kind of half-flexible pavement asphalt skeleton and cement mortar boundary strength test side
Method, by carrying out nano-indenter test analysis to existing half-flexible pavement test specimen section interface, it is difficult to solve current test method
It is the thin micro object of ground surface material to test the problem of half-flexible pavement asphalt skeleton is with cement mortar interface mechanicses intensity
Learn research and new approaches are provided.
(2) technical scheme
In order to solve to test difficulty currently for half-flexible pavement asphalt skeleton and cement mortar boundary strength
Problem, the present invention use nano-indenter test method, make half-flexible pavement test specimen by laboratory test first；Then, half-and-half
Flexible pavement requires to carry out the cutting process of test sample according to tester, and chosen material interfacial characteristics is representative
Sample is standby；Finally, impression test is carried out to sample characteristic interface using nano-hardness tester, obtains the springform of material interface
The mechanics parameters such as amount, creep, interface binding power, and parameter is analyzed and processed.
(3) beneficial effect
The advantages of half-flexible pavement has flexible pavement seamless concurrently, and road-ability is high and rigid pavement bearing capacity are strong, resistance to
The advantages of mill, good endurance.For half-flexible pavement compared with plain asphalt road surface, its high temperature stability performance is stronger than plain asphalt road surface
Several times, so being adapted in the places such as highway tollgate, port and pier, goods station and steep slope road section of growing up use.Bituminous paving
The skeleton structure of material and the main factor that interface binding intensity is influence pavement strength, but in the past to asphalt pavement material
Mostly research is that ground surface material interface binding intensity is improved in terms of the viscosity of pitch is improved, for interface between the different materials of road surface
Mechanical strength, which lacks a kind of intuitively method, to be tested.
The nano-indenter test method that the present invention uses not only can be in half-flexible pavement asphalt skeleton and cement bonded sand
Slurry interface can use, and can be generalized between other road surface different materials in interface detection, be also applied for being completed road
The boundary strength test in face.Nano-indenter test parameters obtained is a kind of micro- rill evolution, is popularized in current method for numerical simulation
Background under, the parameter that this mode gathers is also easy to combine with numerical simulation rill evolution, mutually checking, promote numerical value
Analogy method develops.
Embodiment
The present invention provides a kind of half-flexible pavement asphalt skeleton and cement mortar boundary strength method of testing, specifically
Implementation steps are as follows：
(1) preferably basalt aggregate is used to prepare half-flexible pavement porous asphalt mixture skeleton, determines that the pitch mixes
The match ratio of gathering materials of material, asphalt optimum content, rotary compactor is used to prepare voidage as 28% bitumen mixture specimen, with
Just cement injection mortar；
(2) ratio of mud, the additive of cement mortar are determined, prepares cement grouting mortar, make its fluidity 9~11 seconds it
Between, cement mortar fully, is uniformly filled into porous asphalt mixture test specimen on flat vibrating table, it is ensured that cement mortar grouting
Full porous asphalt mixture test specimen, in standard curing room health 28 days；
(3) half-flexible pavement test specimen is prepared by sample according to nano-hardness tester test request using cutting machine and sander,
Select surfacing, sample that is complete and clearly showing asphalt skeleton and cement mortar interfacial structure is used for nano impress
Experiment；
(4) the interface hardness of the sample, modulus of elasticity, creep function, fracture toughness, interface are tied using nano-hardness tester
Make a concerted effort to be tested, each target interface is at least chosen three positions and tested, to eliminate the target interface inhomogeneities pair
Result of the test influences；
(5) each target interface diverse location hardness, modulus of elasticity, creep function, fracture toughness, interface binding power are taken
Result of the test mean values, half-flexible pavement asphalt skeleton and water are levied in microcosmic level upper table with the average value of these parameters
Cement mortar interface mechanicses strength characteristics.
Claims (1)
1. half-flexible pavement asphalt skeleton and cement mortar boundary strength method of testing, it is characterised in that the tool of this method
Body step is as follows：
(1) preferably basalt aggregate is used to prepare half-flexible pavement porous asphalt mixture skeleton, determines the asphalt
Gather materials match ratio, asphalt optimum content, uses rotary compactor to prepare voidage as 28% bitumen mixture specimen, to fill
Water filling cement mortar；
(2) ratio of mud, the additive of cement mortar are determined, prepares cement grouting mortar, makes its fluidity between 9~11 seconds,
Cement mortar fully, is uniformly filled into porous asphalt mixture test specimen on flat vibrating table, it is ensured that cement mortar is filled
Porous asphalt mixture test specimen, in standard curing room health 28 days；
(3) half-flexible pavement test specimen is prepared according to nano-hardness tester test request by sample using cutting machine and sander, selected
Surfacing, sample that is complete and clearly showing asphalt skeleton and cement mortar interfacial structure try for nano impress
Test；
(4) using nano-hardness tester to the interface hardness of the sample, modulus of elasticity, creep function, fracture toughness, interface binding power
Tested, each target interface is at least chosen three positions and tested, to eliminate the target interface inhomogeneities to experiment
As a result influence；
(5) experiment of each target interface diverse location hardness, modulus of elasticity, creep function, fracture toughness, interface binding power is taken
As a result average value, half-flexible pavement asphalt skeleton and cement bonded sand are levied in microcosmic level upper table with the average value of these parameters
Starch interface mechanicses strength characteristics.
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| CN110243706A (en) * | 2019-05-24 | 2019-09-17 | 浙江省水利河口研究院 | It can avoid the mass concrete interfacial transition zone hardness measuring method of machining damage |
| CN110272227A (en) * | 2019-05-31 | 2019-09-24 | 武汉理工大学 | Cement pitch combined type is from snow melt ground surface material and preparation method thereof |
| CN112082863A (en) * | 2020-09-11 | 2020-12-15 | 山东大学 | Method for testing microcosmic bonding strength and elastic modulus of transition zone of concrete interface |
| CN112147054A (en) * | 2020-09-25 | 2020-12-29 | 青岛路桥建设集团有限公司 | Rapid test method for matrix communication porosity of semi-flexible pavement |
| CN113310800A (en) * | 2021-05-14 | 2021-08-27 | 扬州大学 | Asphalt and cement mortar interface tensile strength testing device and testing method |
| CN113484173A (en) * | 2021-06-25 | 2021-10-08 | 武汉理工大学 | Method for evaluating microscopic three-phase medium distinguishing and characteristic parameters of asphalt mixture |
| CN114117615A (en) * | 2021-12-02 | 2022-03-01 | 中国科学院武汉岩土力学研究所 | Method and device for determining performance of roadbed of highway section and processing equipment |
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| CN110272227A (en) * | 2019-05-31 | 2019-09-24 | 武汉理工大学 | Cement pitch combined type is from snow melt ground surface material and preparation method thereof |
| CN112082863A (en) * | 2020-09-11 | 2020-12-15 | 山东大学 | Method for testing microcosmic bonding strength and elastic modulus of transition zone of concrete interface |
| CN112082863B (en) * | 2020-09-11 | 2021-06-11 | 山东大学 | Method for testing microcosmic bonding strength and elastic modulus of transition zone of concrete interface |
| CN112147054A (en) * | 2020-09-25 | 2020-12-29 | 青岛路桥建设集团有限公司 | Rapid test method for matrix communication porosity of semi-flexible pavement |
| CN113310800A (en) * | 2021-05-14 | 2021-08-27 | 扬州大学 | Asphalt and cement mortar interface tensile strength testing device and testing method |
| CN113484173A (en) * | 2021-06-25 | 2021-10-08 | 武汉理工大学 | Method for evaluating microscopic three-phase medium distinguishing and characteristic parameters of asphalt mixture |
| CN113484173B (en) * | 2021-06-25 | 2023-10-03 | 武汉理工大学 | Asphalt mixture microscopic three-phase medium distinguishing and characteristic parameter evaluation method |
| CN114117615A (en) * | 2021-12-02 | 2022-03-01 | 中国科学院武汉岩土力学研究所 | Method and device for determining performance of roadbed of highway section and processing equipment |
| CN114117615B (en) * | 2021-12-02 | 2022-09-20 | 中国科学院武汉岩土力学研究所 | Method and device for determining performance of roadbed of highway section and processing equipment |
| US11847383B2 (en) | 2021-12-02 | 2023-12-19 | Institute Of Rock And Soil Mechanics, Chinese Academy Of Sciences | Method for determining a performance of an unsaturated subgrade of a multi-layered expressway section and processing device thereof |
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