CN107576579A - A kind of cement pavement calking shearing strength test method - Google Patents
A kind of cement pavement calking shearing strength test method Download PDFInfo
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- CN107576579A CN107576579A CN201710760352.0A CN201710760352A CN107576579A CN 107576579 A CN107576579 A CN 107576579A CN 201710760352 A CN201710760352 A CN 201710760352A CN 107576579 A CN107576579 A CN 107576579A
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- calking
- cement
- shearing strength
- cement block
- shear
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Abstract
The present invention provides a kind of cement pavement calking shearing strength test method, belong to cement pavement calking pavement performance technical field of measurement and test, solving current calking shearing strength test method, can not to simulate cement pavement seam crossing calking actual by scissor state, it is difficult to the problem of directly perceived, its shearing strength of accurate evaluation.The present invention first prepares cement block calking composite member, then vertical pressure load is applied to middle cement block, so as to simulate the actual shear action being subject to of calking, shearing strength is calculated in the cross-sectional area finally contacted according to failure by shear maximum pressure and calking with cement block, takes shearing strength of the average value as calking of the shearing strength of three groups of parallel test specimens.Method of testing provided by the invention simulates calking actual loading situation, clearly obtain the size of its shearing strength, the perfect research system of cement pavement calking structural behaviour, is of great significance to improving the performance of calking and extending cement pavement service life tool.
Description
Technical field
The present invention is a kind of cement pavement calking shearing strength test method, belongs to cement pavement calking pavement performance
Technical field of measurement and test.
Background technology
Cement pavement and bituminous paving are current most important two kinds of paving forms, because cement pavement is with higher
Intensity, its typically all be used for undertake heavier communications and transportation.Seam is one of cement pavement most important components, simultaneously
And weakest part.Seam is sealed using calking, but calking load, environment etc. effect under can produce extrusion,
Come off, stress concentration, aging, cracking etc. destroy, cause calking to fail, cause cement pavement to produce faulting of slab ends, purt mud, disconnected plate etc.
Disease, so as to influence the performance of road and durability.It is therefore desirable to using retractility is good, anti-embeddability, durability are preferable
Calking sealing joints.
What calking was mainly subject in actual use is the effect such as stretching, compression, shearing.Stretching action mainly by
Being reduced in temperature causes cement road surface plate to shrink generation tensile stress；Compression is then the cement road surface plate because temperature raises
Expansion, extrude calking；Shear action is that the road deck by load in vehicle travel process produces with the road deck not by load
Raw vertical displacement is poor, the calking of seam crossing is acted on by shear stress.The research of calking focuses primarily upon the performance of material
Research, the research of the elasticity, heat endurance, durability performance of such as material, the research for mechanical property focus primarily upon material
Expect the research of tensile strength, stretch modulus, compressive strength and modulus of compressibility.Under normal circumstances, stretching and compression performance use
It is that tensile testing machine and compression test are tested, tensile strength, the pressure of material is determined by stress, strain or power and displacement
Contracting intensity etc..
The shear behavior of calking seldom accounts for when mechanical property is studied, but also has a few studies person to it
Analyzed.There is the mould that researcher establishes cement-concrete road joint and calking using large-strain finite element method
Type, joint concrete wall is assumed into rigid body, calking at coagulating cement panel top termination contact with being assumed to be stress concentration
Situation, the unit that calking is divided into very little analyzed, and has returned the pass between the maximum shear stress and shear strain
It is formula.Some scholars have carried out shearing test, but what they mainly studied is pitch class calking, using dynamic shear rheological
Test instrument carries out shearing test to such calking, passes through the cutting performance of complex shear modulus Indirect evaluation caulking material.
It can be seen that calking shear behavior concerns the Load-transfer Capacity of cement pavement seam, the also destruction with cement pavement ceases
Correlation, most of pavement destructions are relevant with the shear action that calking is subject to, and being unsatisfactory for requirement mainly due to shearing strength causes
Calking peels off, departs from and ftractureed, and then causes a series of cement pavement breakoff phenomenons, so proposing cement pavement shearing strength
New method of testing is most important.But current test method can not simulate cement pavement seam crossing calking and actually be cut
Cut state to test its shearing strength, it is difficult to the directly perceived, shearing strength of accurate evaluation calking, cause calking to occur tight
The failure by shear of weight, influences calking service life.The present invention prepares cement block-calking composite member, simulates cement pavement
Calking real work stress, shear strength test is carried out to it, shearing strength that is directly perceived, evaluating calking exactly,
Reduce calking causes to destroy because shear stress is excessive, improves calking durability.
The content of the invention
(1) technical problem
It is an object of the present invention to provide a kind of cement pavement calking shearing strength test method, solves current calking shearing resistance
Strength test method be difficult to simulate cement pavement seam crossing calking it is actual by shearing condition, can not intuitively, accurate evaluation filleting
The problem of shearing strength of material, reduce calking and failure by shear occur, extend calking service life, it is durable to improve cement pavement
Property and service level.
(2) technical scheme
In order to solve current calking shearing strength test method be difficult to simulate cement pavement seam crossing calking it is actual by
Shear stress state, can not intuitively, accurate evaluation calking shearing strength the problem of, the present invention is actual according to cement pavement calking
Stress, prepare cement block-calking composite member simulation calking real work stress, there is provided a kind of cement pavement
Calking shearing strength test method.Technical solution of the present invention is as follows：First by three cement blocks and two calking test specimen intervals
Arrangement, such as Fig. 1, carries out bonding combination using epoxy resin adhesive, applies vertical pressure load to middle cement block, makes cement block
The calking on both sides produces vertical displacement, so as to simulate cement pavement calking under carload effect by the cement plate of load
With not shear action caused by by vertical displacement difference caused by the cement plate of load.Stress when being destroyed according to composite member and
The cross-sectional area that calking contacts with cement block can try to achieve the shearing strength of calking in test specimen, then same two groups of test specimens are entered
The same experiment of row, the average value of three groups of obtained effective shearing strengths are the shearing strength for surveying calking.
(3) beneficial effect
With the continuous development of cement pavement, calking is also increasingly taken seriously.The destruction of cement pavement is largely
It is as caused by damaging calking, being easily accessible debris in seam after calking damage influences the retractility of cement road surface plate, easily
Cause panel to arch upward, be crowded broken.In addition, rainwater can penetrate into sub-surface after calking damage, the bearing capacity of basic unit is influenceed, is caused
Concrete slab damages, so as to influence the performance of cement pavement and durability.Cause the source of damage of calking except material
It is also indefinite to the actual forced status of calking outside the problem of material itself.Cement pavement calking provided by the invention
Shearing strength test method, simulation calking actual loading situation, which carries out experiment, can clearly obtain the size of its shearing strength, complete
Be apt to the research system of cement pavement calking structural behaviour, to the material of calking preferably, physical dimension determine, stress
Improvement etc. has obvious effect, so as to improve the performance of calking and durability, reduces cement pavement maintenance cost
And its influence to road normal traffic operation, extend cement pavement service life, more preferably development is established faster for cement pavement
Basis is determined.
Brief description of the drawings
Fig. 1 cement pavement calking shear strength test schematic diagrames
1- presses load；2- calkings；3-U clamps；Cement block among 4-；5- sides cement block；6- cement tile heights；7- water
Clod width
Embodiment
The present invention provides a kind of cement pavement calking shearing strength test method, and specific implementation step is as follows：
(1) cement block-calking composite member prepared by is successively by side cement block, calking, middle cement block, filleting
Material and side cement block gap composition, the size of two of which side cement block is 12.7 (width) × 12.7 (thickness) × 25.4 (height)
mm3, the size of middle cement block is 12.7 (width) × 12.7 (thickness) × 12.7 (height) mm3, the size of two calking test specimens is
6.3 (width) × 12.7 (thickness) × 12.7 (height) mm3；
(2) cement block among two side cement blocks, two calkings and one is sequentially arranged at intervals, the arrangement of side cement block
In outermost, all cement blocks are concordant with calking top, bonding with epoxy resin adhesive between any two, treat that adhesive is complete
All solidstate, cement, calking shear strength test composite member be made, three same composite members are prepared using this method,
Carry out parallel test；
(3) U-clamp is had opening up, a composite member is vertically put into fixture, and adjust U clamp jaw widths, in water
Square to fixed Combination test specimen, vertical pressure lotus is applied with 20mm/min speed to the center of middle cement block above composite member
Carry, until calking test specimen destruction in composite member, record maximum pressure and vertical displacement；
(4) calking maximum pressure divided by two calkings contacted with cement block measured during failure by shear
Cross-sectional area sum, obtains the shearing strength of calking, and by vertical maximum displacement divided by calking width, obtains maximum shear
Strain；
(5) using same shearing strength test method and computational methods, the shearing resistance for obtaining two other parallel test specimen is strong
Degree strains with maximum shear, under conditions of the margin of error is met, takes the shearing strength measured three times and maximum shear should
The average value of change strains as the shearing strength and maximum shear of calking.
Claims (1)
1. a kind of cement pavement calking shearing strength test method, it is characterised in that this method comprises the following steps that：
(1) cement block-calking composite member prepared by successively by side cement block, calking, middle cement block, calking and
Side cement block gap forms, and the size of two of which side cement block is 12.7 (width) × 12.7 (thickness) × 25.4 (height) mm3, in
Between the size of cement block be 12.7 (width) × 12.7 (thickness) × 12.7 (height) mm3, the size of two calking test specimens is 6.3
(width) × 12.7 (thickness) × 12.7 (height) mm3；
(2) cement block among two side cement blocks, two calkings and one is sequentially arranged at intervals, side cement block is arranged in most
Outside, all cement blocks are concordant with calking top, bonding with epoxy resin adhesive between any two, treat that adhesive is completely solid
Change, cement, calking shear strength test composite member is made, three same composite members are prepared using this method, carried out
Parallel test；
(3) U-clamp is had opening up, a composite member is vertically put into fixture, and adjust U clamp jaw widths, in level side
To fixed Combination test specimen, vertical pressure load is applied with 20mm/min speed to the center of middle cement block above composite member,
Until calking test specimen destruction in composite member, maximum pressure and vertical displacement are recorded；
(4) calking maximum pressure divided by two calkings contacted with cement block measured during failure by shear is transversal
Area sum, obtains the shearing strength of calking, and by vertical maximum displacement divided by calking width, obtaining maximum shear should
Become；
(5) same shearing strength test method and computational methods are used, obtain the shearing strength of two other parallel test specimen with
Maximum shear strains, and under conditions of the margin of error is met, takes what the shearing strength measured three times and maximum shear strained
Average value strains as the shearing strength and maximum shear of calking.
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| CN201710760352.0A CN107576579A (en) | 2017-08-23 | 2017-08-23 | A kind of cement pavement calking shearing strength test method |
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| CN201710760352.0A CN107576579A (en) | 2017-08-23 | 2017-08-23 | A kind of cement pavement calking shearing strength test method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108254267A (en) * | 2018-04-23 | 2018-07-06 | 深圳市仟亿建筑技术有限公司 | There are skin anti-shear concrete strength test test specimen, testing equipment and test method |
| CN110823717A (en) * | 2019-11-01 | 2020-02-21 | 广州大学 | Semi-flexible pavement shear strength testing device and testing method |
| CN112268817A (en) * | 2020-10-26 | 2021-01-26 | 长安大学 | Rock shear fracture judging method in normal unloading direct shear test |
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| CN1818611A (en) * | 2006-03-21 | 2006-08-16 | 武汉理工大学 | Method for measuring adhering material shearing performance and its experimental device thereof |
| CN101509868A (en) * | 2009-02-18 | 2009-08-19 | 西北农林科技大学 | Method for testing interface shear strength of sample bonded by sealant and bonded substrate |
| CN102426143A (en) * | 2011-09-22 | 2012-04-25 | 中国建筑科学研究院 | Method and device for detecting compressive strength of concrete by shearing resistance method |
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| CN203396655U (en) * | 2013-08-19 | 2014-01-15 | 王文明 | Shearing instrument for detecting concrete compression strength |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108254267A (en) * | 2018-04-23 | 2018-07-06 | 深圳市仟亿建筑技术有限公司 | There are skin anti-shear concrete strength test test specimen, testing equipment and test method |
| CN110823717A (en) * | 2019-11-01 | 2020-02-21 | 广州大学 | Semi-flexible pavement shear strength testing device and testing method |
| CN112268817A (en) * | 2020-10-26 | 2021-01-26 | 长安大学 | Rock shear fracture judging method in normal unloading direct shear test |
| CN112268817B (en) * | 2020-10-26 | 2024-04-09 | 长安大学 | Rock shearing fracture discrimination method in normal unloading direct shear test |
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