CN109100246A - A kind of road surface Reflection Cracking performance test methods and track plate test piece mould - Google Patents
A kind of road surface Reflection Cracking performance test methods and track plate test piece mould Download PDFInfo
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- CN109100246A CN109100246A CN201810734862.5A CN201810734862A CN109100246A CN 109100246 A CN109100246 A CN 109100246A CN 201810734862 A CN201810734862 A CN 201810734862A CN 109100246 A CN109100246 A CN 109100246A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of road surface Reflection Cracking performance test methods.Production track plate test specimen is required first, in accordance with the size of wheel tracking test, the track plate test specimen is made of the finishing coat of the basal layer of lower layer and upper layer, the finishing coat is ground surface material to be tested, the basal layer is divided into two pieces of left and right by the gap that about one front and back penetrates through entirely, and the fastener for limiting the displacement of track plate test piece end is provided in the two pieces of basal layers in left and right；After being laid with elastic cushion block under the track plate test specimen, the Reflection Cracking performance for the development road pavement material that the track plate test specimen is carried out round-trip rut test, and applied according to crack on the finishing coat with load using vehicle tracking test instrument is evaluated.The invention also discloses a kind of track plate test piece mould and its application methods.Compared with prior art, the present invention has simple and easy, the low advantage of cost of implementation.
Description
Technical field
The present invention relates to a kind of road surface Reflection Cracking performance test methods.
Background technique
When carrying out Old cement concrete transformation, one layer of asphalt overlay usually is overlayed on its surface, and works as concrete
When the tensile stress that displacement generates is more than the tensile strength of asphaltum concrete cover-layer, finishing coat just will form reflection crack.Reflection crack one
Denier generates, and not only will affect the beauty and driving comfort level of bituminous pavement, can also greatly shorten the service life on road surface.Therefore,
The performance for capableing of accurate evaluation road surface Reflection Cracking is particularly important.
Currently, for bituminous pavement Reflection Cracking performance evaluation method there are mainly two types of.One of which is using road
Surface analysis instrument APA carries out simulation fatigue test.The instrument somewhat expensive, complicated operation, and needs to be separately formed muti-piece examination
Part is to carry out parallel test.Another kind is to carry out simulation laboratory test according to Finite element analysis results.This method is also to use
Dedicated pilot system is simulated, but load is using bar shaped evenly load, poor with the wheel load on practical road surface
It is different, and be also required to be separately formed multiple test specimens progress parallel tests.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a kind of road surface Reflection Crackings
Energy test method, has simple and easy, the low advantage of cost of implementation.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of road surface Reflection Cracking performance test methods require production track plate test specimen first, in accordance with the size of track experiment,
The track plate test specimen is made of the finishing coat of the basal layer of lower layer and upper layer, and the finishing coat is road surface material to be tested
Material, the basal layer is divided into two pieces of left and right by the gap that about one front and back penetrates through entirely, and is all provided in the two pieces of basal layers in left and right
It is equipped with the fastener for limiting track plate end displacement；After being laid with elastic cushion block under the track plate test specimen, track is used
Tester carries out wheel tracking test to the track plate test specimen, and increased with number of loading according to crack on the finishing coat
The Reflection Cracking performance of development road pavement material is evaluated.
Preferably, the material of the basal layer is cement concrete.
Preferably, the fastener includes the two rows of spirals being symmetrically disposed in the two pieces of basal layers in left and right, screw-thread steel
The interspersed direction of muscle is perpendicular to the extension direction in the gap, and in basal layer, the other end stretches out substrate for one end of spiral
Layer is outer, and the one end stretched out outside basal layer is fixed with bolt.
Preferably, the elastic cushion block is rubber cushion blocks.It is further preferred that the elasticity modulus of the rubber cushion blocks is 50
~70Mpa.
Preferably, drawing on two end faces that the finishing coat corresponds to the gap both ends has grid.It is further excellent
Selection of land, the grid are white bottom, black line.
Preferably, crack passes through in following data extremely with the increased development of number of loading on the finishing coat
Lack one kind to characterize:
Just occurs wheel tracking test load number when crack on finishing coat；
Crack on finishing coat penetrates through wheel tracking test load number when entire finishing coat just；
Crack extends to wheel tracking test load number when any vertical position；
Wheel tracking test when crack on finishing coat penetrates through entire finishing coat just loads the ratio of number and overcoat layer thickness；
Wheel tracking test load number when crack on finishing coat penetrates through entire finishing coat just has just been split on finishing coat
The difference between wheel tracking test load number when seam；
When wheel tracking test arbitrarily loads number, position of the crack terminal with respect to preset slot.
Following technical scheme can also be obtained based on identical invention thinking:
A kind of track plate test piece mould, for realizing any technical solution the method as above, which includes
Dismountable forward and backward baffle and left and right baffle and bottom plate；Be provided on the bottom plate one piece be parallel to left and right baffle every
Plate, divider height are lower than the height of forward and backward baffle and left and right baffle；It is logical that a row has been symmetrically arranged in left and right baffle
Hole, the lead to the hole site are about the half of the divider height.
Forward and backward baffle and left and right baffle and bottom plate assembly be by the application method of track plate test piece mould as described above
One entirety is inserted into spiral in the through-hole of left and right baffle and is secured with nuts respectively in medial and lateral；Then wherein
Form basal layer identical with divider height；Basal layer upper surface spread emulsified asphalt sticking layer oil after shaping, and above
Form finishing coat；Track plate test specimen is obtained after demoulding.
Compared with prior art, technical solution of the present invention has the advantages that
The present invention directlys adopt the test evaluation that existing widely used vehicle tracking test instrument carries out road surface Reflection Cracking performance, and one
Aspect is not needed using fc-specific test FC device, and easy to operate, cost of implementation is low, has a wide range of application；On the other hand, of the invention
Test result is visual and clear, and can a variety of different evaluation indexes of flexible design according to actual needs.
Detailed description of the invention
Fig. 1 is the schematic perspective view after track plate test piece mould of the present invention assembles in specific embodiment；
Fig. 2 is the scale diagrams after track plate test piece mould of the present invention assembles in specific embodiment；
Fig. 3 is obtained test specimen structural schematic diagram after demoulding；
Fig. 4 is the track plate test specimen side view obtained after cutting；
Fig. 5 is test philosophy schematic diagram.
Specific embodiment
In view of the deficiencies of the prior art, thinking of the invention is to utilize the widely used vehicle tracking test instrument of road engineering industry
Carry out the test evaluation of road surface Reflection Cracking performance, on the one hand, do not need using fc-specific test FC device, easy to operate, realization
It is at low cost, have a wide range of application；On the other hand, gained test result is visual and clear, and can according to actual needs flexible design it is more
The different evaluation index of kind.
Specifically, road surface Reflection Cracking performance test methods of the invention, are wanted first, in accordance with the size of wheel tracking test
Production track plate test specimen is sought, the track plate test specimen is made of the finishing coat of the basal layer of lower layer and upper layer, and the finishing coat is
Institute's ground surface material to be tested, the basal layer are divided into two pieces of left and right by the gap that about one front and back penetrates through entirely, and in left and right
The fastener for limiting track plate end displacement is provided in two pieces of basal layers；Elasticity is laid under the track plate test specimen
After cushion block, round-trip rut test is carried out to the track plate test specimen using vehicle tracking test instrument, and split according on the finishing coat
Seam is evaluated with the Reflection Cracking performance of the increased development road pavement material of number of loading.
Wherein, basal layer uses corresponding base material preferably based on practical the case where road is transformed, to simulate as far as possible
Actual conditions, but in view of China's sub-surface is mostly cement stabilized soil material or cement concrete, and coagulating cement earth forming
It is fast and convenient, therefore, for simplicity, cement concrete can be used uniformly as base layer material.
Due to not fully consolidated between track plate test specimen and track mold baffle, track plate test specimen under the action of wheel load
End will appear vertical displacement, not be inconsistent with practical pavement behavior, and be unable to reach test purpose, to solve this problem, this hair
The bright fastener that limitation rut test piece end displacement is provided in the two pieces of basal layers in left and right.Preferably, the fastener packet
The two rows of spirals being symmetrically disposed in the two pieces of basal layers in left and right are included, the interspersed direction of spiral is perpendicular to the gap
Extension direction, in basal layer, the other end stretches out outside basal layer for one end of spiral, and stretches out one end spiral shell outside basal layer
Bolt is fixed.
In order to simulate the actual conditions of road stress as far as possible, when carrying out wheel tracking test, need in track plate test specimen
The lower elastic cushion block being laid with for simulating practical roadbed, theoretically the elasticity of the elastic cushion block should be with the roadbed feelings of tested road
Condition is consistent；For ease of operation, by analyzing a large amount of road foundation situations, discovery can be used uniformly elasticity modulus and be
The rubber cushion blocks of 50~70MPa simulate most of roadbeds.
During wheel tracking test, with load number increase, finishing coat can from the gap generate crack
And gradually extend, for the ease of observation and statistical measurement, two end faces at the gap both ends can be corresponded in finishing coat in advance
Upper drafting grid, the position coordinates and system of crack endpoint when can orient different number of loading easily with visual type
Count out the data such as crack extended length.The Reflection Cracking performance of final finishing coat can be designed according to test data many indexes come
It is evaluated, for example, wheel tracking test when just having occurred crack on finishing coat loads number；Crack on finishing coat penetrates through just
Wheel tracking test when entire finishing coat loads number；Crack extends to wheel tracking test load number when any vertical position；Cover
Wheel tracking test when crack in surface layer penetrates through entire finishing coat just loads the ratio of number and overcoat layer thickness；On finishing coat
Wheel tracking test load number and finishing coat of the crack when penetrating through entire finishing coat just on track when just having there is crack try
Test the difference between load number；When wheel tracking test arbitrarily loads number, the position in the relatively described gap of crack terminal.
Track plate test specimen needed for quickly preparing above-mentioned test method for convenience, the present invention also further devise one
Kind track plate test piece mould, including dismountable forward and backward baffle and left and right baffle and bottom plate；One is provided on the bottom plate
Block is parallel to the partition of left and right baffle, and divider height is lower than the height of forward and backward baffle and left and right baffle；In left and right baffle
It is symmetrically arranged an exhausting hole, the lead to the hole site is about the half of the divider height.
When preparing track plate test specimen using track plate test piece mould, forward and backward baffle and left and right baffle and bottom plate are filled
With for an entirety, and partition is inserted into forward and backward baffle, be then inserted into the through-hole of left and right baffle spiral and
Medial and lateral are secured with nuts respectively；Then basal layer identical with divider height is formed wherein；Basal layer health after molding
Surface spread emulsified asphalt sticking layer oil on it after the completion, and finishing coat is formed above；Track plate test specimen is obtained after demoulding.
To carry out technical solution of the present invention with a specific embodiment and in conjunction with attached drawing below convenient for public understanding
It is described in detail:
Track plate test piece mould employed in the present embodiment is as shown in Figure 1 and Figure 2 (dimensional units are mm in figure) comprising
Dismountable forward and backward baffle and left and right baffle and bottom plate；It is fixed with one piece among the bottom plate and is parallel to left and right baffle
Partition, for generating the gap.In the present embodiment, as the cement concrete layer of basal layer with a thickness of 4cm, centre is utilized
Partition reserves the seam of 1cm wide with simulation fracture, is parallel to the reserved 2 φ 1cm's of every 10cm among two side baffles in partition direction
The spiral of hole and interspersed φ 1cm, the spacing of 2 holes are 4cm, are fixed on the outside of reinforcing bar with bolt, on the inside of baffle and outer
The setting length of side reinforcing bar is respectively 8cm and 3cm.Track plate test piece mould in the present embodiment is multiple using disposably preparing
The size design of test specimen.
When preparing track plate test specimen using mold shown in Fig. 1, Fig. 2, first by forward and backward baffle and left and right baffle and bottom
Plate assembly is an entirety, and partition is inserted into forward and backward baffle, is then inserted into spiral in the through-hole of left and right baffle
And it is secured with nuts respectively in medial and lateral；Then the cement concrete slab of 4cm thickness is first formed, and is uniformly spraying 0.8- above
1.0kg/m2Emulsified asphalt sticking layer oil, then above form 4cm thickness asphalt concrete layer (specific material and thickness can roots
It is adjusted according to the surface conditions of actual test)；Will forward and backward baffle and left and right baffle and bottom plate remove after can be obtained as
Test specimen shown in Fig. 3.
After specimen molding, the test specimen is averagely cut into 3 pieces along the direction perpendicular to crack, the track obtained after cutting
Plate test specimen side view is as shown in Figure 4；For the ease of observing and measuring, with white paint by each parallel with section of asphalt concrete layer
Face is whitewashed, and black line grid division is used as unit of 2mm, i.e., disposably obtains 3 pieces of final track plate test specimens.
It (is tried in the present embodiment using the track plate as shown in figure 5, one of track plate test specimen is put back to test fixture
Part also serves as test fixture) middle position, and in advance mold bottom be laid with rubber cushion blocks to simulate soil matrix, the bullet of rubber cushion blocks
Property modulus be 60MPa；Wheel tracking test is carried out using vehicle tracking test instrument, observes the development of asphalt concrete layer reflection crack,
The Reflection Cracking performance of the development road pavement material finally applied according to reflection crack with load is evaluated.
Also it can replace parallel test specimen after test is taken turns in completion one and repeat to test, so that evaluation result is truer
Reliably.
Claims (10)
1. a kind of road surface Reflection Cracking performance test methods, which is characterized in that require system first, in accordance with the size of wheel tracking test
Make track plate test specimen, the track plate test specimen is made of the finishing coat of the basal layer of lower layer and upper layer, and the finishing coat is is wanted
The ground surface material of test, the basal layer is divided by the gap that about one front and back penetrates through entirely controls two pieces, and is controlling two pieces
The fastener for limiting track plate end displacement is provided in basal layer；Elastic cushion block is laid under the track plate test specimen
Afterwards, round-trip rut test carried out to the track plate test specimen using vehicle tracking test instrument, and according to crack on the finishing coat with
The Reflection Cracking performance of the increased development road pavement material of number of loading is evaluated.
2. method as described in claim 1, which is characterized in that the material of the basal layer is cement concrete.
3. method as described in claim 1, which is characterized in that the fastener includes being symmetrically disposed in the two pieces of basal layers in left and right
Two rows of spirals, the interspersed direction of spiral is perpendicular to the extension direction in the gap, and one end of spiral is in base
In bottom, the other end stretches out outside basal layer, and the one end stretched out outside basal layer is fixed with bolt.
4. method as described in claim 1, which is characterized in that the elastic cushion block is rubber cushion blocks.
5. method as claimed in claim 4, which is characterized in that the elasticity modulus of the rubber cushion blocks is 50~70MPa.
6. method as described in claim 1, which is characterized in that correspond to two end faces at the gap both ends in the finishing coat
Upper drafting has grid.
7. method as claimed in claim 6, which is characterized in that the grid is white bottom, black line.
8. method as described in claim 1, which is characterized in that crack is with the increased development of number of loading on the finishing coat
Situation is characterized by least one of following data:
Just occurs wheel tracking test load number when crack on finishing coat；
Crack on finishing coat penetrates through wheel tracking test load number when entire finishing coat just；
Crack extends to wheel tracking test load number when any vertical position；
Wheel tracking test when crack on finishing coat penetrates through entire finishing coat just loads the ratio of number and overcoat layer thickness；
Wheel tracking test load number when crack on finishing coat penetrates through entire finishing coat just has just been split on finishing coat
The difference between wheel tracking test load number when seam；
When wheel tracking test arbitrarily loads number, the position in the relatively described gap of crack terminal.
9. a kind of track plate test piece mould, for realizing any one of such as claim 1~8 the method, which is characterized in that the vehicle
Rut plate test piece mould includes dismountable forward and backward baffle and left and right baffle and bottom plate；One piece is provided on the bottom plate in parallel
In the partition of left and right baffle, divider height is lower than the height of forward and backward baffle and left and right baffle；It is right respectively in left and right baffle
Title is provided with an exhausting hole, and the lead to the hole site is about the half of the divider height.
10. the application method of track plate test piece mould as claimed in claim 9, which is characterized in that by forward and backward baffle and left and right
Baffle and bottom plate assembly are an entirety, and partition is inserted into forward and backward baffle, is then inserted into the through-hole of left and right baffle
Spiral is simultaneously secured with nuts in medial and lateral respectively；Then basal layer identical with divider height is formed wherein；It is forming
Basal layer upper surface spread emulsified asphalt sticking layer oil afterwards, and finishing coat is formed above；Track plate test specimen is obtained after demoulding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810734862.5A CN109100246B (en) | 2018-07-06 | 2018-07-06 | Pavement anti-reflection crack performance testing method and track plate test piece mold |
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| CN201810734862.5A CN109100246B (en) | 2018-07-06 | 2018-07-06 | Pavement anti-reflection crack performance testing method and track plate test piece mold |
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| CN109100246B CN109100246B (en) | 2021-03-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520749A (en) * | 2019-01-08 | 2019-03-26 | 北京市城市管理研究院（北京市环境卫生监测中心） | A kind of Modular trial road surface |
| CN110927367A (en) * | 2019-11-06 | 2020-03-27 | 齐鲁交通发展集团有限公司 | Method and equipment for evaluating anti-reflection crack performance of cold-recycling structural layer of asphalt pavement |
| CN113376037A (en) * | 2021-06-08 | 2021-09-10 | 宜昌砼富公路养护有限公司 | Test method and test device for simulating pavement reflection cracks |
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| CN113376037A (en) * | 2021-06-08 | 2021-09-10 | 宜昌砼富公路养护有限公司 | Test method and test device for simulating pavement reflection cracks |
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| CN109100246B (en) | 2021-03-16 |
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