CN111487155B - Method for testing frost heaving stress resolution effect of asphalt mixture communicated pores - Google Patents

Method for testing frost heaving stress resolution effect of asphalt mixture communicated pores Download PDF

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CN111487155B
CN111487155B CN202010268206.8A CN202010268206A CN111487155B CN 111487155 B CN111487155 B CN 111487155B CN 202010268206 A CN202010268206 A CN 202010268206A CN 111487155 B CN111487155 B CN 111487155B
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asphalt mixture
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陈俊
王俊鹏
张文明
陈景雅
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Abstract

The invention provides a method for testing the resolution effect of communicated pores of an asphalt mixture on frost heaving stress, which comprises the following steps: 1. scanning a test piece by using a CT (computed tomography) instrument, reconstructing a three-dimensional connected pore structure of the test piece, and extracting the number m of vertical connected pores and the number n of radial connected pores; 2. after the asphalt mixture test piece is saturated with water in vacuum, frost heaving stress test is carried out on the test piece to obtain initial frost heaving stress sigma in horizontal and vertical directionsH1And σV1(ii) a 3. After the test piece is thawed to normal temperature, cutting the test piece into four pieces along the horizontal symmetrical plane and the vertical symmetrical plane, inserting a plastic plate into a cutting plane, and adhering the cutting pieces in situ by using glue; 4. respective test of horizontal and vertical frost heaving stress sigma of the gel test pieceH2And σV2(ii) a 5. And calculating the resolution ratio.

Description

Method for testing frost heaving stress resolution effect of asphalt mixture communicated pores
Technical Field
The invention relates to the field of asphalt mixture performance testing, in particular to a method for testing the resolution effect of communicated pores of an asphalt mixture on frost heaving stress.
Background
The road occupies an important part in modern traffic, wherein the asphalt pavement is widely applied in China due to the characteristics of high driving comfort, good stability, low noise and the like. Asphalt pavements, however, also have a number of problems, wherein the freeze-thaw durability of the pavement has been of constant interest to many researchers. The performance and the quality of the asphalt pavement are improved, so that the performance of the pavement material is adaptive to the environmental requirements, and the asphalt pavement material is the key point of research on road work.
In road engineering in cold areas, under the action of rainfall or snowfall weather, water can permeate into pores of the asphalt concrete pavement; when the air temperature is reduced, under the condition that the pore water saturation (the ratio of water to pore volume) of the asphalt concrete pavement is large, the pore water ice-condensation volume expands, the pore wall is subjected to frost heaving pressure stress of ice, and when the asphalt mixture is restrained, the pressure stress cannot be effectively released and dissipated, so that frost heaving stress is generated in the whole mixture structure, and frost heaving damage is caused; the frost heaving damage generated by the asphalt concrete can damage the pavement structure, the service life of the asphalt pavement is reduced, and the pavement is seriously damaged by freeze thawing; the damage of frost heaving stress to the asphalt concrete can reduce the pavement performance of the asphalt concrete, so the low-temperature performance of the asphalt concrete has very important research significance. In recent years, around the problem of freeze-thaw durability of asphalt mixtures, many road workers have conducted some researches on indoor simulation methods in the freeze-thaw cycle process, the performance decay law of the mixtures after freeze-thaw, aggregate and asphalt interface damage caused by freeze-thaw, and the like, and have achieved certain results.
However, in the current experimental research, the digestion effect of the asphalt concrete communicated pores on the frost heaving stress is not linked with the low-temperature performance of the asphalt concrete, and a test method for the digestion effect of the asphalt concrete communicated pores on the frost heaving stress is not provided; therefore, a test method is needed for researching the digestion effect of the communicated pores on the frost heaving stress, so that the performance of the asphalt mixture can be better evaluated.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a method for testing the digestion effect of communicated pores of an asphalt mixture on frost heaving stress.
The technical scheme adopted by the invention is as follows:
a method for testing the resolution effect of communicated pores of an asphalt mixture on frost heaving stress comprises the following steps:
the method comprises the following steps: scanning an asphalt mixture test piece by using a CT (computed tomography) instrument, reconstructing a three-dimensional connected pore structure of the test piece according to a scanning result, and extracting the number m of vertical connected pores and the number n of radial connected pores;
step two: after the asphalt mixture test piece is saturated with water in vacuum, frost heaving stress test is carried out on the test piece to obtain initial frost heaving stress sigma in horizontal and vertical directionsH1And σV1；
Step three: unfreezing the test piece, cutting the test piece into four pieces along a horizontal symmetrical plane and a vertical symmetrical plane after the test piece is at normal temperature, inserting a plastic plate into the cut surface, and bonding the four pieces inserted into the plastic plate according to the original relative positions by using glue;
step four: respectively testing the frost heaving stress sigma in the horizontal direction and the vertical direction of the cemented asphalt mixture test pieceH2And σV2；
Step five: calculating the resolution ratios of the communicating holes in the horizontal direction and the communicating holes in the vertical direction to the frost heaving stress, wherein the resolution ratios are respectively alpha and beta, and the formula is as follows:
Figure BDA0002442135470000021
Figure BDA0002442135470000022
according to the invention, the expansion volume of water ice moves along the communication direction of the communication pore, so that the frost heaving stress is reduced, the frost heaving stress has a certain digestion effect, and the digestion effect of the communication pore on the frost heaving stress is evaluated by using the ratio alpha and beta obtained by comparing the frost heaving stress before and after the communication pore of the test piece is cut off.
As a further improvement of the present invention, the vertical cutting plane in step three is perpendicular to the radial direction selected in step one.
As a further improvement of the invention, the determination point of the frost heaving stress of the asphalt mixture after cementation in the fourth step is consistent with the determination point of the asphalt mixture before cutting in the second step.
As a further improvement of the invention, the frost heaving stress test is carried out in the second step and the fourth step by adopting the same test conditions.
As a further improvement of the invention, the test apparatus used is kept at the test ambient temperature before and after the test.
As a further improvement of the invention, the plastic plate adopts a hard plastic thin plate with the thickness of less than 1mm, and the shape and the size of the plastic thin plate are consistent with the cutting surface of the asphalt mixture.
Has the advantages that: the invention has the following advantages:
(1) the invention skillfully links the performance test of the asphalt mixture and the digestion effect of the communicated pores on the frost heaving stress, and evaluates the performance of the asphalt mixture from the communicated pores.
(2) According to the invention, the number n of the communicated pores in the horizontal direction and the number m of the communicated pores in the vertical direction are related to the digestion rates alpha and beta, so that the digestion effect of different numbers of the communicated pores on the frost heaving stress can be measured.
(3) The method utilizes the digestion rates alpha and beta to evaluate the digestion effect of the communicated pores on the frost heaving stress, and the digestion effect evaluation on the frost heaving stress is more pertinent.
Drawings
FIG. 1 is a schematic flow chart of a testing method of the present invention;
FIG. 2 is a frost heaving stress test chart of an uncut asphalt mixture;
FIG. 3 is a frost heaving stress test chart of the asphalt mixture after cementation;
FIG. 4 is a cross-sectional view of a frost heaving stress test of the asphalt mixture after cementation;
FIG. 5 is a constraint diagram of a frost heaving stress test specimen
Description of reference numerals: 1-asphalt mixture test piece, 2-pressure box, 3-communicating pore, 4-closed pore, 5-aggregate, 6-external constraint mechanism, 7-cementation test piece and 8-plastic plate.
Detailed Description
The invention is further described below with reference to the accompanying drawings; the following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby. The invention is implemented by the following steps:
(1) firstly, forming an asphalt mixture test piece 1 (hereinafter referred to as a test piece 1) in a rotary compaction mode; the method comprises the steps of scanning a test piece 1 by using a CT scanner to generate 162 vertical cross section images and 101 horizontal cross section images, importing the generated images into a Mimics image processing software to reconstruct a three-dimensional pore structure, and then acquiring characteristic parameters (information such as a starting point coordinate, an end point coordinate and a cross section average hydraulic radius of each pore) of the pores by using software OGFC (open glass flow control) asphalt mixture internal pore identification software), so that the number m of communicated pores 3 in the vertical direction and the number n of communicated pores 3 in the radial direction of the test piece 1 are extracted from the software.
(2) And (3) sequentially carrying out vacuum water saturation for 15min and normal-pressure soaking for 30min on the test piece 1 to obtain a normal-temperature water-saturated test piece. Then, carrying out freeze thawing treatment by adopting air-freezing water melting; firstly, carrying out low-temperature pretreatment on a frost heaving stress testing device, placing the frost heaving stress testing device in a low-temperature box at the temperature of minus 18 ℃ for 3 hours, then placing a test piece 1 in the frost heaving stress testing device at the temperature of minus 18 ℃, placing the testing device in the low-temperature box at the temperature of minus 18 ℃, carrying out frost heaving stress test on the test piece 1, recording the frost heaving stress of the test piece 1 in the horizontal direction and the vertical direction, and recording the frost heaving stress as sigmaH1And σV1. The structure of the device used in the test is shown in fig. 5: an external restraint mechanism 6 capable of clamping the pressure box 2 is arranged on the outer side of the test piece, a steel cylinder is adopted as the external restraint mechanism 6, gaps for placing the pressure box 2 are formed between the side surface, the upper surface and the lower surface of the steel cylinder and the placed test piece, and the pressure box 2 is fixed between the steel cylinder and the test piece. In the testing process, the steel cylinder is kept in an environment of 18 ℃ below zero in advance before the test piece 1 is placed in the steel cylinder, so that the influence of shrinkage stress generated by the steel cylinder at a low temperature is eliminated, and accurate frost heaving stress data of the asphalt mixture test piece 1 are obtained.
(3) After the frost heaving stress test is finished, dissolving the test piece 1 in normal temperature water for 4 hours; after the test piece is at normal temperature, cutting the dissolved asphalt mixture 1 into four blocks along the horizontal symmetrical surface and the vertical symmetrical surface, washing the cutting surface with water in the cutting process, and preventing the aggregate 5 scraps from splashing in the cutting process; wherein the vertical cutting surface of the test piece is perpendicular to the radial direction selected in the step one; the ABS hard plastic thin plate 8 with the thickness of 1mm is inserted into a cutting surface of the asphalt mixture, the size and the shape of the ABS plastic thin plate 8 are the same as those of the cutting surfaces of the asphalt mixture in the horizontal direction and the vertical direction, glue is uniformly and thinly coated on two sides of the ABS hard plastic thin plate 8, and the four blocks are bonded according to the original relative positions; the hard plastic plate can effectively block the communicating pores of the asphalt mixture, eliminate the digestion effect of the communicating pores on frost heaving stress, and the thin plate with the thickness of 1mm can not cause great changes in the volume and the quality of a cemented asphalt mixture test piece.
(4) And (3) performing frost heaving stress test on the test piece which is inserted into the plastic thin plate 8 and cemented by adopting the same conditions and treatment process as those in the step (2), and recording the frost heaving stress of the cemented test piece 7 in the horizontal direction and the vertical direction as sigmaH2And σV2(ii) a The purpose of low-temperature pretreatment on the frost heaving stress testing device is to eliminate the influence of shrinkage stress generated by the steel cylinder at a low temperature, so that accurate data of the frost heaving stress of the cemented test piece 7 after cementation can be obtained; in order to obtain more accurate resolution of the communicated pores 3 to the frost heaving stress before and after the test, the measurement point for measuring the frost heaving stress of the cemented test piece 7 after the cementation should be consistent with the measurement point of the test piece 1 before the cutting; and will be
Figure BDA0002442135470000041
Defined as the resolution ratio of single connected pore in the n connected pores 3 in the horizontal direction to the frost heaving stress
Figure BDA0002442135470000042
The resolution ratio of single communicated pores in the vertical direction to the frost heaving stress is defined, and then the resolution effect of the asphalt mixture communicated pores on the frost heaving stress is evaluated through alpha and beta.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1.一种沥青混合料连通孔隙对冻胀应力消解效应的测试方法，其特征在于，包括以下步骤：1. a method for testing the connected pores of asphalt mixture to the frost heave stress dissipating effect, is characterized in that, comprises the following steps: 步骤一：利用CT仪扫描沥青混合料试件，根据扫描结果重构试件的三维连通孔隙结构，提取竖向连通孔隙数量m和一个径向上连通孔隙数量n；Step 1: Scan the asphalt mixture sample with a CT scanner, reconstruct the three-dimensional connected pore structure of the sample according to the scanning results, and extract the number m of vertical connected pores and the number n of connected pores in a radial direction; 步骤二：将沥青混合料试件真空饱水后，对试件进行冻胀应力测试，获得水平和竖直方向的初始冻胀应力
Figure DEST_PATH_IMAGE001
和
Figure 377041DEST_PATH_IMAGE002
；Step 2: After the asphalt mixture specimen is vacuum saturated with water, the frost heave stress test is performed on the specimen to obtain the initial frost heave stress in the horizontal and vertical directions.
Figure DEST_PATH_IMAGE001
and
Figure 377041DEST_PATH_IMAGE002
; 步骤三：将试件解冻，待试件常温后，沿水平对称面和竖向对称面将试件切割成四块，并将塑料板插入切割面，用胶水将插入塑料板的四个块体按其原有相对位置粘结；Step 3: Thaw the test piece, and after the test piece is at room temperature, cut the test piece into four pieces along the horizontal and vertical symmetrical planes, insert the plastic plate into the cutting surface, and glue the four blocks inserted into the plastic plate. Bond according to its original relative position; 步骤四：分别测试胶结后沥青混合料试件的水平和竖直方向冻胀应力
Figure DEST_PATH_IMAGE003
和
Figure 747978DEST_PATH_IMAGE004
；Step 4: Test the horizontal and vertical frost heave stress of the cemented asphalt mixture specimens respectively
Figure DEST_PATH_IMAGE003
and
Figure 747978DEST_PATH_IMAGE004
; 步骤五：计算水平方向的连通孔和竖直方向上的连通孔对冻胀应力的消解率，分别为
Figure DEST_PATH_IMAGE005
和
Figure 776983DEST_PATH_IMAGE006
， 公式为：Step 5: Calculate the digestion rates of the connected holes in the horizontal direction and the connected holes in the vertical direction to the frost heave stress, respectively:
Figure DEST_PATH_IMAGE005
and
Figure 776983DEST_PATH_IMAGE006
, the formula is:
Figure 985241DEST_PATH_IMAGE008
，
Figure 985241DEST_PATH_IMAGE008
,
Figure DEST_PATH_IMAGE009
。
Figure DEST_PATH_IMAGE009
. 2.根据权利要求1所述的一种沥青混合料连通孔隙对冻胀应力消解效应的测试方法，其特征在于：步骤三中的竖向切割面垂直于步骤一中所选取的径向方向。2 . The test method for the frost heave stress dissipating effect of the interconnected pores of an asphalt mixture according to claim 1 , wherein the vertical cutting plane in the step 3 is perpendicular to the radial direction selected in the step 1. 3 . 3.根据权利要求1所述的一种沥青混合料连通孔隙对冻胀应力消解效应的测试方法，其特征在于：步骤四中测定胶结后沥青混合料冻胀应力的测定点与步骤二中切割前的沥青混合料冻胀应力的测定点一致。3. the test method of a kind of asphalt mixture connected pores according to claim 1 to the frost heave stress dissipating effect, it is characterized in that: in step 4, measure the measuring point of asphalt mixture frost heave stress after cementation and cut in step 2 The measurement points of the frost heave stress of the previous asphalt mixture are the same. 4.根据权利要求1所述的一种沥青混合料连通孔隙对冻胀应力消解效应的测试方法，其特征在于：步骤二和步骤四采用相同的测试条件进行冻胀应力测试。4 . The method for testing the frost heave stress dissipating effect of the interconnected pores of an asphalt mixture according to claim 1 , wherein step 2 and step 4 use the same test conditions to perform frost heave stress test. 5 . 5.根据权利要求4所述的一种沥青混合料连通孔隙对冻胀应力消解效应的测试方法，其特征在于：测试前后，所使用的测试装置保持在测试环境温度中。5 . The method for testing the frost heave stress dissipating effect of the interconnected pores of an asphalt mixture according to claim 4 , wherein the test device used is kept at the test environment temperature before and after the test. 6 . 6.根据权利要求1所述的一种沥青混合料连通孔隙对冻胀应力消解效应的测试方法，其特征在于，所述的塑料板采用厚度低于1mm的质硬塑料薄板，其形状大小与沥青混合料切割面一致。6. the test method for the frost heave stress dissipating effect of a kind of asphalt mixture connected pores according to claim 1, is characterized in that, described plastic plate adopts the hard plastic sheet with thickness lower than 1mm, and its shape and size are the same as 1mm. The cutting surface of the asphalt mixture is consistent.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2339457A1 (en) * 2001-03-07 2002-09-07 Raymond H. Gordon Gas and energy generation system
CN208109839U (en) * 2018-04-27 2018-11-16 徐州工程学院 Concrete frozen process experiment frost heave monitoring device
KR101925512B1 (en) * 2018-04-17 2018-12-05 한국건설기술연구원 Complex Reinforcing Material with Glass Fiber, And Method for Pavement of Asphalt Road Using the Same
CN109868803A (en) * 2019-03-28 2019-06-11 哈尔滨工业大学 A kind of frost heave stress detection device and its detection method
CN110375685A (en) * 2019-04-24 2019-10-25 南京林业大学 A kind of test method of big gap bituminous concrete freeze thawing front and back asphalt filmthickness variable quantity
CN110596357A (en) * 2019-08-02 2019-12-20 江苏宿迁交通工程建设有限公司 Device and method for testing frost heaving stress and release characteristic of porous asphalt mixture

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101153850A (en) * 2006-09-30 2008-04-02 长安大学 A detection method and system for asphalt mixture
CN107462471B (en) * 2017-09-11 2020-11-13 交通运输部公路科学研究所 Method for evaluating water stability of asphalt mixture based on complex modulus damage of slice test piece

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2339457A1 (en) * 2001-03-07 2002-09-07 Raymond H. Gordon Gas and energy generation system
KR101925512B1 (en) * 2018-04-17 2018-12-05 한국건설기술연구원 Complex Reinforcing Material with Glass Fiber, And Method for Pavement of Asphalt Road Using the Same
CN208109839U (en) * 2018-04-27 2018-11-16 徐州工程学院 Concrete frozen process experiment frost heave monitoring device
CN109868803A (en) * 2019-03-28 2019-06-11 哈尔滨工业大学 A kind of frost heave stress detection device and its detection method
CN110375685A (en) * 2019-04-24 2019-10-25 南京林业大学 A kind of test method of big gap bituminous concrete freeze thawing front and back asphalt filmthickness variable quantity
CN110596357A (en) * 2019-08-02 2019-12-20 江苏宿迁交通工程建设有限公司 Device and method for testing frost heaving stress and release characteristic of porous asphalt mixture

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
A constitutive model for simulation of water to ice phase change in asphalt mixtures;Aikaterini Varveri 等;《researchgate》;20140630;全文 *
张洪刚.水_温冻融条件下沥青路面病害特征及发展机理.《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》.2011,(第06期),全文. *

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