CN111351717A - Composite test piece for temperature stress test of constrained test piece and test method - Google Patents
Composite test piece for temperature stress test of constrained test piece and test method Download PDFInfo
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- CN111351717A CN111351717A CN202010196379.3A CN202010196379A CN111351717A CN 111351717 A CN111351717 A CN 111351717A CN 202010196379 A CN202010196379 A CN 202010196379A CN 111351717 A CN111351717 A CN 111351717A
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- 238000012360 testing method Methods 0.000 title claims abstract description 105
- 238000010998 test method Methods 0.000 title claims abstract description 15
- 239000002131 composite material Substances 0.000 title claims description 16
- 239000011384 asphalt concrete Substances 0.000 claims abstract description 42
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 17
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000007613 environmental effect Effects 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000013101 initial test Methods 0.000 claims description 2
- 230000000452 restraining effect Effects 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 2
- 230000001070 adhesive effect Effects 0.000 claims 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 12
- 239000007767 bonding agent Substances 0.000 description 6
- 238000005336 cracking Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
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Classifications
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0057—Generation of the force using stresses due to heating, e.g. conductive heating, radiative heating
-
- 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
- G01N2203/0067—Fracture or rupture
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0694—Temperature
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a novel test method in the field of civil engineering, in particular to a temperature stress test of an asphalt concrete constraint test piece under the action of an additional temperature load and a test piece manufacturing method. The test method utilizes the characteristic of large linear shrinkage coefficient of High Density Polyethylene (HDPE) to realize the application of additional temperature load on the asphalt concrete sample in the environmental box of the constraint sample temperature stress tester through the shrinkage deformation of the HDPE block, and the low-temperature crack resistance of the asphalt concrete is evaluated. The method can evaluate the low-temperature crack resistance of the asphalt concrete under different additional temperature load levels, and provides reference for the material design and the structure optimization of the asphalt concrete layer of the high-speed railway. The test method is simple to operate, good in effect and low in cost.
Description
Technical Field
The invention relates to a composite test piece for a temperature stress test of a constraint test piece and a test method, belonging to the technical field of railways.
Background
Asphalt concrete is a typical temperature sensitive material, and low temperature cracking is one of the main disease forms of asphalt concrete pavements in cold regions. The asphalt concrete pavement is of a strip-shaped continuous structure, and asphalt concrete shrinks under the condition of cooling to generate temperature stress inside. When the temperature stress gradually builds up to its tensile strength, the asphalt concrete layer fractures and transverse cracks develop. The generation of transverse cracks provides a channel for road surface underwater seepage, and is extremely unfavorable for road base stability.
In recent years, the application of the full-section asphalt concrete waterproof sealing layer in the ballastless track of the high-speed railway in China has a better effect. Compared with the common cement concrete waterproof sealing layer, the asphalt concrete waterproof sealing layer has better crack resistance and can effectively prevent the surface water from infiltrating, thereby reducing freeze-thaw damage and improving the stability of the roadbed and the driving safety of the high-speed railway. However, in the practical application process, the asphalt concrete waterproof sealing layer also has the problem of low-temperature cracking, and the cracks are mainly concentrated at the expansion joint of the base plate. Due to the structural particularity of the ballastless track of the high-speed railway, particularly the discontinuity of the base plate covering the waterproof sealing layer of the asphalt concrete, the waterproof sealing layer of the asphalt concrete bears the self temperature stress under the cooling condition and is simultaneously subjected to the additional temperature stress applied by the contraction of the upper structure (the track plate and the base plate). Therefore, the cracking of the waterproof sealing layer of the asphalt concrete at the expansion joint of the base plate is the result of the combined action of the temperature stress of the waterproof sealing layer of the asphalt concrete and the additional temperature stress of the upper structure.
The appearance of the additional temperature stress puts new requirements on the crack resistance of the waterproof sealing layer of the asphalt concrete. A temperature stress test (freezing test) of a constrained test piece is one of typical test methods for evaluating the low-temperature performance of asphalt concrete in the field of road engineering, and is used for testing the crack resistance of the asphalt concrete in a real cooling environment. The existing temperature stress test method for the constrained test piece is designed for the temperature stress environment of asphalt concrete on an asphalt pavement, only the temperature stress generated by the self shrinkage of the asphalt concrete in a cooling environment is considered, and the method has great limitation on the evaluation of the cracking performance of the waterproof closed layer of the asphalt concrete under the action of the additional temperature stress of the upper structure.
Disclosure of Invention
The invention aims to solve the defects of the existing test method, and provides a composite test piece and a test method for a test of temperature stress of a constraint test piece, which are used for simulating the stress condition of a high-speed railway ballastless track asphalt concrete waterproof sealing layer at a base plate expansion joint in a cooling environment, testing and evaluating the low-temperature crack resistance of an asphalt concrete material under the action of the additional temperature stress of an upper structure, and providing a reference for the engineering application of the high-speed railway asphalt concrete waterproof sealing layer.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a composite test piece for restraining temperature stress of a test piece is formed by bonding an asphalt concrete test piece and a high-density polyethylene (HDPE) test piece, wherein the middle part of the composite test piece is a 40cm by 150cm asphalt concrete test piece, two ends of the composite test piece are respectively bonded with a 50cm by 50cm HDPE test piece, the HDPE is a polymer material with high strength and large linear shrinkage coefficient, and the linear shrinkage coefficient can reach 200 × 10-6m/m ℃ is approximately equal to the linear shrinkage coefficient of the asphalt concrete material (21 × 10)-6m/m < 10 deg. > C, a large shrinkage deformation will be generated in the cooling process. The test piece manufacturing method is simple to manufacture and convenient to use, and the sizes of the asphalt concrete test block and the HDPE test block can be adjusted according to needs.
The invention also discloses a test method for the temperature stress test of the constrained test piece, which comprises the following steps:
(1) bonding the composite test piece in a test piece chuck by using a bonding agent, standing at room temperature for about 24 hours after bonding, solidifying the bonding agent, and paying attention to not deform the test piece in the test piece placing process;
(2) mounting a test piece on a TSRST tester, mounting a displacement sensor and a temperature sensor, controlling the temperature in an environmental box at the initial test temperature, and keeping the temperature constant for l hours;
(3) setting test parameters in a test program and starting a test, automatically testing and recording the temperature, the stress and the displacement by an instrument, and drawing a temperature stress curve;
(4) when the test piece breaks at a certain temperature (i.e. the stress suddenly decreases to a small value), the temperature decrease is stopped, and the test is ended.
(5) And determining the freeze-fracture temperature, the temperature stress during fracture and the like of the test piece according to a temperature-stress curve automatically drawn by the test equipment.
As a modification of the present invention, the test initiation temperature in step (2) is 4 ℃.
The test piece installation process and the test steps are the same as those of the temperature stress test of the conventional asphalt concrete constraint test piece, the test fixture and the loading program are not required to be modified, and the additional temperature stress is applied to the asphalt mixture test piece by means of the shrinkage deformation of the HDPE test block in the cooling process. The additional temperature stress generated by HDPE shrinkage deformation increases with the decreasing temperature amplitude. By adjusting the size of the HDPE test block in the composite test piece, the amplitude of the additional temperature stress in the experimental process can be controlled, so that the requirements of different use environments are met.
Compared with the prior art, the invention has the beneficial effects that:
the test method provided by the invention is simple to operate, good in test effect, low in manufacturing cost of the composite test piece and convenient to use, the sizes of the asphalt concrete test block and the HPDE test block in the composite test piece can be adjusted according to test requirements, the low-temperature crack resistance of the asphalt concrete under different additional temperature stress levels is simulated, and reference is provided for design and structure optimization of the high-speed railway asphalt concrete waterproof sealing layer material.
Drawings
FIG. 1 is a schematic diagram of the dimensions of a composite test piece according to the present invention.
FIG. 2 is a graph comparing test results obtained by the test method of the present invention with conventional TSRST test results.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The method comprises the steps of firstly mixing and preparing a hot-mix asphalt mixture according to a design mixing proportion, molding an asphalt concrete slab by a wheel rolling method, cutting the asphalt concrete slab into 40cm 150cm asphalt concrete test blocks for manufacturing composite test pieces, respectively bonding 50cm HDPE test blocks at two ends of the asphalt concrete test blocks, wherein HDPE is a polymer material with high strength and large linear shrinkage coefficient, the linear shrinkage coefficient of the HDPE can reach 200 × 10-6 m/m, is about 10 times of the linear shrinkage coefficient (21 × 10-6 m/m ℃), and can generate large shrinkage deformation in the cooling process.
And bonding the processed HDPE test block at two ends of the asphalt concrete test block by using a special bonding agent, fixing, and standing at room temperature for about 24 hours to cure the bonding agent, wherein the interface bonding strength reaches the highest level. One set for each three composite specimens.
And bonding the prepared composite test piece in a test piece chuck by using a bonding agent, and standing at room temperature for about 24 hours after bonding to cure the bonding agent. Care was taken not to deform the test piece during placement.
The test piece is installed on a constrained test piece temperature stress tester (TSRST) produced by American OEM company, a displacement sensor and a temperature sensor are installed, the temperature in an environment box is controlled at a test starting temperature (generally 4 ℃), and the temperature is kept constant for l hours.
Setting test parameters in a test program and starting a test, automatically testing and recording the temperature, the stress and the displacement by an instrument, and drawing a temperature stress curve. When the test piece breaks at a certain temperature (i.e. the stress suddenly decreases to a small value), the temperature decrease is stopped, and the test is ended.
And determining the freeze-fracture temperature, the temperature stress during fracture and the like of the test piece according to a temperature-stress curve automatically drawn by the test equipment. As shown in fig. 2, the experimental results obtained by the experimental method described in this example are shown in fig. 2 in comparison with the results of the conventional TSRST experiment.
Claims (3)
1. The utility model provides a compound test piece for retraining test piece temperature stress test which characterized in that is formed by asphalt concrete test piece and the bonding of high density polyethylene piece, asphalt concrete test piece set up in the intermediate position, high density polyethylene piece be in through sticky setting asphalt concrete test piece's both sides.
2. A test method for restraining temperature stress of a test piece is characterized by comprising the following steps:
(1) bonding the composite test piece of claim 1 in a test piece chuck by using an adhesive, standing at room temperature for about 24 hours after bonding to cure the adhesive, and taking care not to deform the test piece during the test piece placement process;
(2) mounting a test piece on a TSRST tester, mounting a displacement sensor and a temperature sensor, controlling the temperature in an environmental box at the initial test temperature, and keeping the temperature constant for l hours;
(3) setting test parameters in a test program and starting a test, automatically testing and recording the temperature, the stress and the displacement by an instrument, and drawing a temperature stress curve;
(4) when the test piece is broken at a certain temperature, stopping cooling, and ending the test;
(5) and determining the freeze-breaking temperature and the temperature stress during fracture of the test piece according to a temperature-stress curve automatically drawn by the test equipment.
3. A test method for constraining the temperature stress of a test piece according to claim 2, wherein: the test in step (2) was started at 4 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010196379.3A CN111351717A (en) | 2020-03-19 | 2020-03-19 | Composite test piece for temperature stress test of constrained test piece and test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010196379.3A CN111351717A (en) | 2020-03-19 | 2020-03-19 | Composite test piece for temperature stress test of constrained test piece and test method |
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|---|---|
| CN111351717A true CN111351717A (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010196379.3A Pending CN111351717A (en) | 2020-03-19 | 2020-03-19 | Composite test piece for temperature stress test of constrained test piece and test method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710818A (en) * | 2020-12-23 | 2021-04-27 | 中冶路桥建设有限公司 | Method and device for evaluating low-temperature performance of asphalt pavement crack repairing material |
| CN114002261A (en) * | 2021-11-29 | 2022-02-01 | 广西交科集团有限公司 | Asphalt mixture linear shrinkage coefficient measuring device and using method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100715623B1 (en) * | 2007-01-10 | 2007-05-08 | 한국투수개발 주식회사 | Asphalt concrete mixture for porous and quiet pavement & method of preparation |
| CN102109441A (en) * | 2010-12-21 | 2011-06-29 | 东南大学 | Method for evaluating low-temperature crack-resisting performance of asphalt mixture |
| CN104278598A (en) * | 2014-09-22 | 2015-01-14 | 东南大学 | Self-compacting bituminous concrete waterproof seal and construction method thereof |
| CN108894062A (en) * | 2018-05-11 | 2018-11-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of bituminous concrete ballastless track structure |
-
2020
- 2020-03-19 CN CN202010196379.3A patent/CN111351717A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100715623B1 (en) * | 2007-01-10 | 2007-05-08 | 한국투수개발 주식회사 | Asphalt concrete mixture for porous and quiet pavement & method of preparation |
| CN102109441A (en) * | 2010-12-21 | 2011-06-29 | 东南大学 | Method for evaluating low-temperature crack-resisting performance of asphalt mixture |
| CN104278598A (en) * | 2014-09-22 | 2015-01-14 | 东南大学 | Self-compacting bituminous concrete waterproof seal and construction method thereof |
| CN108894062A (en) * | 2018-05-11 | 2018-11-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of bituminous concrete ballastless track structure |
Non-Patent Citations (4)
| Title |
|---|
| 冯卡等: "用低温约束冻断试验方法评价沥青混合料低温抗裂性能", 《公路交通科技》 * |
| 李泰灃等: "严寒地区高速铁路全断面沥青混凝土防水封闭结构温度效应研究", 《铁道建筑》 * |
| 洪海、程培峰: "温度作用下HDPE-橡胶粉改性沥青应力吸收层防止反射裂缝性能", 《中国公路学报》 * |
| 王伟等: "环氧树脂－ 混凝土叠合结构的热应力分析", 《公路交通科技》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112710818A (en) * | 2020-12-23 | 2021-04-27 | 中冶路桥建设有限公司 | Method and device for evaluating low-temperature performance of asphalt pavement crack repairing material |
| CN114002261A (en) * | 2021-11-29 | 2022-02-01 | 广西交科集团有限公司 | Asphalt mixture linear shrinkage coefficient measuring device and using method thereof |
| CN114002261B (en) * | 2021-11-29 | 2024-02-20 | 广西交科集团有限公司 | Asphalt mixture line shrinkage coefficient measuring device and using method thereof |
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Application publication date: 20200630 |