CN111272575A - Method for determining relationship between low-temperature performance of asphalt cement and low-temperature performance of asphalt mixture - Google Patents
Method for determining relationship between low-temperature performance of asphalt cement and low-temperature performance of asphalt mixture Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 143
- 239000000203 mixture Substances 0.000 title claims abstract description 55
- 239000004568 cement Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012360 testing method Methods 0.000 claims abstract description 110
- 238000006073 displacement reaction Methods 0.000 claims abstract description 27
- 238000011056 performance test Methods 0.000 claims abstract description 13
- 238000005452 bending Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 12
- 230000003068 static effect Effects 0.000 claims abstract description 11
- 238000005056 compaction Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000009864 tensile test Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 1
- 238000004154 testing of material Methods 0.000 claims 1
- 239000002344 surface layer Substances 0.000 description 9
- 238000005336 cracking Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 2
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 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
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
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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
- G01N2203/0067—Fracture or rupture
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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
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
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Abstract
The method for determining the relationship between the low-temperature performance of the asphalt cement and the low-temperature performance of the asphalt mixture comprises the following steps: step 1, performing a low-temperature performance test on the asphalt cement by using a bending beam rheometer; step 2, calculating the creep stiffness modulus and creep rate of the asphalt cement at different temperatures; step 3, manufacturing a test piece by adopting a rotary compaction forming method; step 4, installing a transverse needle type electromagnetic displacement sensor and a vertical needle type electromagnetic displacement sensor for measuring displacement changes in two directions; step 5, mounting a test piece; step 6, applying a static load to the test piece through a material test system to obtain the creep compliance and the Poisson ratio of the asphalt mixture; and 7, comparing and analyzing the creep stiffness modulus of the asphalt cement obtained in the step 2 and the creep compliance of the asphalt mixture obtained in the step 6 to obtain a relational expression. The method establishes the relationship between the asphalt cement and the low-temperature performance of the asphalt mixture, and realizes the simple, convenient and accurate acceptance method of the low-temperature performance of the asphalt pavement.
Description
Technical Field
The invention belongs to the technical field of low-temperature crack resistance verification of asphalt pavements, and particularly relates to a method for determining a relation between low-temperature performance of an asphalt cement and low-temperature performance of an asphalt mixture.
Background
The low-temperature shrinkage crack of the asphalt pavement is quite common not only in cold areas but also in warm areas, is a road disease which is not completely solved in the world at present, the generation of the low-temperature shrinkage crack not only destroys the continuity and the integrity of the pavement, but also influences the attractiveness of the pavement, but also often further worsens the road condition, and aggravates the development and the expansion of the crack under the combined action of vehicle load and water, so that large-area crack and net crack are formed, and the service quality and the service life of the road are seriously threatened.
The transverse cracking of the asphalt surface layer in the seasonally frozen area, which is caused by the constraint of low-temperature shrinkage, is caused by the incompatibility of the deformation properties of the asphalt and the asphalt mixture with the changes of the environmental temperature (low temperature and cooling rate). Under the given environment temperature condition, the control of the occurrence of low-temperature shrinkage cracking of the asphalt surface layer and the cracking density (cracking amount) of the asphalt surface layer mainly depends on the selection of asphalt and asphalt mixture adaptive to the environment temperature, and the structural characteristics (the thickness, age and roadbed type) of the asphalt pavement only influence the cracking amount of the low-temperature shrinkage cracking of the asphalt surface layer.
The low-temperature performance of the asphalt is a key factor influencing the low-temperature shrinkage crack of the asphalt surface layer, and the low-temperature performance of the asphalt mixture has great influence on the low-temperature shrinkage crack of the asphalt surface layer. The main indexes for evaluating the low-temperature performance of the asphalt mixture are low-temperature creep stiffness (creep flexibility), low-temperature tensile strength and temperature shrinkage coefficient. The critical cracking temperature of the asphalt mixture can be calculated and analyzed according to the three parameters, and whether the performance of the asphalt mixture can meet the requirements or not is judged after the critical cracking temperature is compared with the lowest temperature of the local pavement.
At present, in a new edition of 'road asphalt pavement design Specification' (JTG D50-2017), the checking calculation of low-temperature performance in a pavement design stage is definitely specified, the most important parameter is the low-temperature creep stiffness modulus of asphalt, when the low-temperature performance of an asphalt pavement is verified in a paved pavement, as the core drilling and sampling are carried out on a pavement surface layer for testing the low-temperature bending stiffness modulus of a surface layer asphalt cement, and the asphalt cement test can be carried out after the asphalt is extracted and distilled, the operation process is complicated, and part of trichloroethylene can remain in the extracted asphalt, so that the method has poor applicability to the paved pavement and influences the accuracy of the test result. In view of the above, a method for determining the relationship between the low-temperature performance of the asphalt cement and the low-temperature performance of the asphalt mixture is provided.
Disclosure of Invention
The invention aims to establish a method for verifying the low-temperature crack resistance of a road surface of an on-site coring core sample, and establish the relationship between the low-temperature performance of asphalt and the low-temperature performance of an asphalt mixture, so that the low-temperature performance of an asphalt cement is evaluated by adopting the low-temperature performance of an asphalt mixture test piece, the problem that the low-temperature bending stiffness modulus of the asphalt cement of a test surface layer is poor in applicability to the paved road surface is solved, and the simplicity and accuracy of the method for verifying the low-temperature performance of the asphalt road surface are realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for determining the relationship between the low-temperature performance of the asphalt cement and the low-temperature performance of the asphalt mixture comprises the following steps:
step 4, selecting a part with a uniform middle from the test piece formed by the rotary compaction in the step 3, cutting two sections along the radial direction by a double-faced saw, and selecting the part with the uniform middle as a representative test piece; firstly, respectively adhering four sensor support columns on two end faces of a test piece by using a positioning gauge plate, and then installing transverse needle type electromagnetic displacement sensors on two transverse sensor support columns; vertical needle type electromagnetic displacement sensors are arranged on the two vertical sensor supporting columns, and the vertical needle type electromagnetic displacement sensors and the transverse needle type electromagnetic displacement sensors are arranged in a crossed manner and cannot be contacted with each other, and are used for measuring displacement changes in two directions;
step 5, selecting an indirect tensile test pressing strip according to the height and diameter of a tested representative test piece, placing the assembled representative test piece in the center of a clamp of a material test system and clamping the assembled representative test piece, then installing the pressing strip on the upper surface of the assembled representative test piece, enabling a vertical needle type electromagnetic displacement sensor and a loading rod of the material test system to be in the same plane, firstly measuring the indirect tensile ultimate strength, then determining the static load applied by a creep test according to the ultimate strength, ensuring that the magnitude of the static load value is below a certain value to ensure that the mechanical behavior of the asphalt mixture is in a linear viscoelastic range, immediately stopping the test if the horizontal transverse strain at the moment of 100s exceeds 500 mu epsilon, standing the test piece for a period of time, testing again until the magnitude of a certain static load value meets the level strain below a certain value, then carrying out the next step;
step 6, after the test in the step 5 is ready, firstly applying a static load to a representative test piece through a material test system; secondly, setting the loading time of the test piece; setting a test temperature, wherein the temperature interval of the low-temperature performance test in the step is the same as that of the low-temperature performance test of the asphalt beam in the step 2, measuring strain values in the horizontal direction and the vertical direction around the center of the end face of the test piece at different temperatures by using a transverse pin type electromagnetic sensor and a vertical pin type electromagnetic sensor respectively, calculating by using formulas (1), (2) and (3) to obtain creep compliance D (t) of the asphalt mixture, and calculating by using a formula (4) to obtain a Poisson ratio v of the asphalt mixture;
wherein: d (t) is creep compliance (kPa) at time t; bgva、DavgAnd PavgThe average thickness (mm), diameter (mm) and creep load value (N) of a plurality of groups of parallel test specimens are obtained; Δ Xtm,tIs the trimmed mean (mm) of horizontal deformation; x is a strain value (mm) in the horizontal direction at time t; y is a strain value (mm) in the vertical direction at time t; ccmplIs an intermediate variable;
respectively calculating C according to the horizontal displacement and the vertical displacement at the t moment obtained by a plurality of groups of balance testscmplThen, the average value C of the intermediate variable is calculated and is substituted into the formula (3) to calculate the value of creep compliance D (t); if CcmplFails to satisfy equation (2), discarding the set of test data;
and 7, comparing and analyzing the creep stiffness modulus of the asphalt cement obtained in the step 2 and the creep compliance of the asphalt mixture obtained in the step 6 to obtain a relational expression of the creep stiffness modulus of the asphalt cement and the creep compliance of the asphalt mixture.
The left end point of the temperature interval of the low-temperature performance test in the step 2 is the lowest design temperature of the pavement plus 10 ℃; the right endpoint is selected manually based on the number of temperature groups and the adjacent temperature interval.
The number of the groups with different temperatures in the step 2 is 6-10 groups, and the different temperatures are selected to be equidistant or non-equidistant.
And 4, controlling the height of each test piece in the step 4 to be 40-42 mm.
Selecting the static load in the step 6, wherein the horizontal strain is required to be ensured to be between 33 and 500 mu epsilon within 100s, and the horizontal strain is required to be between 250 and 750 mu epsilon within 1000 s; meanwhile, the calculated Poisson ratio is within the range of 0.05-0.5, and the data is valid.
And 6, the test piece loading time is 100-300 s.
The invention has the beneficial effects that:
after the corresponding relation between the low-temperature performance of the asphalt cement and the low-temperature performance of the asphalt mixture is established, the on-site core sample can be used for testing the low-temperature performance of the asphalt mixture, the low-temperature performance of the asphalt cement is reflected by the low-temperature performance of the asphalt mixture, and an effective method is provided for the low-temperature crack resistance checking and accepting work of the asphalt pavement in the engineering field. The operation method has good applicability to the pavement core sample, simplifies the test process, greatly reduces the test cost, and has wide application space and great application potential.
The method and the index for testing the low temperature of the asphalt mixture are researched to establish the relationship between the low temperature performance of the asphalt cement and the low temperature performance of the asphalt mixture, and the simplicity, convenience and accuracy of the method for checking and accepting the low temperature performance of the asphalt pavement are realized.
Drawings
FIG. 1 is a schematic diagram of an installation of a bituminous mixture test piece sensor;
FIG. 2 is a graph showing the relationship between the asphalt cement and the low-temperature performance of the asphalt mixture in example 1;
FIG. 3 is a graph showing the relationship between the asphalt binder and the low temperature performance of the asphalt mixture of example 2.
The method comprises the following steps of 1-sensor support column, 2-transverse pin type electromagnetic sensor and 3-vertical pin type electromagnetic sensor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
The method for determining the relationship between the low-temperature performance of the asphalt cement and the low-temperature performance of the asphalt mixture comprises the following steps:
step 4, cutting the SMA-13 test piece subjected to the rotary compaction forming in the step 3 by a double-sided saw, reserving a part with a uniform middle, cutting the test piece into two sections along the radial direction, and selecting the part with the uniform middle as a representative test piece to obtain the representative test piece with the height of 40 mm; firstly, respectively bonding four sensor support columns 1 on two end faces of a representative test piece by using a positioning gauge plate, wherein two adjacent sensor support columns 1 are arranged at 90 degrees; then installing transverse needle type electromagnetic displacement sensors 2 on the two transverse sensor supporting columns 1; vertical needle type electromagnetic displacement sensors 3 are arranged on the two vertical sensor supporting columns 1, the vertical needle type electromagnetic displacement sensors 3 and the transverse needle type electromagnetic displacement sensors 2 are arranged in a cross mode and cannot be contacted, and the vertical needle type electromagnetic displacement sensors and the transverse needle type electromagnetic displacement sensors are used for measuring displacement changes in two directions, as shown in figure 1;
step 5, selecting an indirect tensile test pressing strip according to the height 40mm and the diameter 150mm of the representative test piece, placing the assembled representative test piece in the center of a clamp of a material test system and clamping, then installing the pressing strip on the upper surface of the assembled representative test piece, enabling the vertical needle type electromagnetic displacement sensor 3 and a loading rod of the material test system to be in the same plane, measuring the indirect tensile ultimate strength, and determining the load applied in the creep test to be 20N according to the ultimate strength;
step 6, after the test in the step 5 is ready, applying a static load of 20N to the representative test piece through a material test system, firstly performing a creep test on the asphalt mixture, wherein the test loading time is 300s, and the creep compliance is calculated by selecting a half value of the loading time which is 150 s; setting test temperature of time, wherein the temperature interval of the low-temperature performance test in the step is the same as that of the low-temperature performance test of the asphalt beam in the step 2, and the test temperatures are 7 groups of-18 ℃, 17 ℃, 16 ℃, 15 ℃, 14 ℃, 13 ℃ and-12 ℃ at intervals of 1 ℃; strain values in the horizontal direction and the vertical direction around the center of the end face of the test piece at different test temperatures are measured through a transverse needle type electromagnetic sensor and a vertical needle type electromagnetic sensor, creep compliance D (t) of the asphalt mixture is obtained through calculation of formulas (1), (2) and (3), and Poisson ratio v of the asphalt mixture is obtained through calculation of a formula (4);
wherein: x is a strain value in the horizontal direction at the time t; y is a strain value in the vertical direction at the time t; ccmplIs an intermediate variable; d (t) is creep compliance (kPa) at time t;gbva、Davgand PavgThe average thickness (mm), diameter (mm) and creep load value (N) of three groups of parallel test specimens are obtained; Δ Xtm,tIs the trimmed mean (mm) of horizontal deformation; x is a strain value (mm) in the horizontal direction at time t; y is a strain value (mm) in the vertical direction at time t; c is the mean value of three groups of intermediate variables which accord with the formula (2);
by three groupsRespectively calculating the horizontal displacement and the vertical displacement at the time t obtained by the balance test to obtain CcmplValues of (C), three groups in this examplecmplAll satisfy the formula (2), and then three C values are obtainedcmplSubstituting the average value C into the formula (3) to obtain the value of creep compliance D (t); then calculating the Poisson's ratio through a formula (4);
and 7, in order to reflect the low-temperature performance of the asphalt cement through the low-temperature performance of the asphalt mixture, comparing and analyzing the creep stiffness modulus of the asphalt cement obtained in the step 2 with the creep compliance of the asphalt mixture obtained in the step 6, taking the creep stiffness modulus of the asphalt cement as a horizontal coordinate and the creep compliance of the asphalt mixture as a vertical coordinate, and obtaining a relational graph as shown in figure 2, wherein the relational expression of the creep stiffness modulus of the asphalt cement and the creep compliance of the asphalt mixture is as follows:
y＝0.0129x-0.0782
wherein y is the creep compliance of the asphalt mixture, and x is the creep stiffness modulus of the asphalt cement; goodness of fit R2The value is 0.9242, with a larger value indicating a better fit.
And 8, in the process of checking and accepting the low-temperature crack resistance of the asphalt pavement, testing the taken core sample according to the steps 3-6 to obtain creep compliance, substituting the creep compliance into the relational expression obtained in the step 8 to obtain the creep stiffness modulus of the asphalt cement, and comparing the creep stiffness modulus with a design value to realize that the checking and accepting of the low-temperature performance of the asphalt cement is completed according to the low-temperature creep compliance of the asphalt mixture.
Example 2
The difference between the example 2 and the example 1 is that in the example 2, the iron pavement 1 standard SBS modified asphalt cement is adopted, and the relation between the creep stiffness modulus of the obtained asphalt cement and the creep compliance of the asphalt mixture is shown in figure 3, and the relation is as follows: y is 0.0157x +0.1307, wherein R2＝0.9501。
Claims (6)
1. A method for determining the relationship between the low-temperature performance of asphalt cement and the low-temperature performance of asphalt mixture is characterized by comprising the following steps:
step 1, performing an asphalt cement low-temperature performance test by adopting a bending beam rheometer, manufacturing the asphalt cement into an asphalt beam, applying a constant load to the asphalt beam by using the bending beam rheometer, and controlling and recording the test load of the asphalt beam and the change situation of midspan deflection of the asphalt beam along with time in the whole test process by using a computer acquisition system;
step 2, performing low-temperature bending beam rheological test on the asphalt beam under different test temperature conditions; the test should satisfy: 60s of creep stiffness modulus not exceeding 300MPa, the value of creep rate being greater than or equal to 0.3; calculating the creep stiffness modulus and creep rate of the asphalt cement at different test temperatures;
step 3, performing a low-temperature indirect tensile creep test on the asphalt mixture by using a material test system, and manufacturing a rotary compaction forming test piece by using a rotary compaction forming method;
step 4, selecting a part with a uniform middle from the rotary compaction forming test piece in the step 3, cutting two sections in the radial direction by a double-faced saw, and selecting the part with the uniform middle as a representative test piece; firstly, respectively adhering four sensor support columns on two end faces of a representative test piece by using a positioning gauge plate, and then installing transverse needle type electromagnetic displacement sensors on two transverse sensor support columns; vertical needle type electromagnetic displacement sensors are arranged on the two vertical sensor supporting columns, and the vertical needle type electromagnetic displacement sensors and the transverse needle type electromagnetic displacement sensors are arranged in a crossed manner and cannot be contacted with each other, and are used for measuring displacement changes in two directions;
step 5, selecting an indirect tensile test pressing strip according to the height and diameter size of a tested representative test piece, placing the assembled representative test piece in the center of a clamp of a material test system and clamping the test piece, then installing the pressing strip on the upper surface of the assembled representative test piece, enabling a vertical needle type electromagnetic displacement sensor and a loading rod of the material test system to be in the same plane, firstly measuring the indirect tensile ultimate strength, then determining the static load applied by a creep test according to the ultimate strength, ensuring that the mechanical behavior of the asphalt mixture is in the linear viscoelasticity range if the horizontal transverse strain at the moment of 100s exceeds 500 mu epsilon, immediately stopping the test, after the test piece is kept still for a period of time, testing again until the certain value of the static load meets the condition that the horizontal strain is below a certain value, then carrying out the next step;
step 6, after the preparation of the step 5, firstly applying a static load to a representative test piece through a material testing system; secondly, setting the loading time of the test piece; setting a test temperature, wherein the temperature interval of the low-temperature performance test in the step is the same as that of the low-temperature performance test of the asphalt beam in the step 2, measuring strain values in the horizontal direction and the vertical direction around the center of the end face of the test piece at different temperatures by using a transverse pin type electromagnetic sensor and a vertical pin type electromagnetic sensor respectively, calculating by using formulas (1), (2) and (3) to obtain creep compliance D (t) of the asphalt mixture, and calculating by using a formula (4) to obtain a Poisson ratio v of the asphalt mixture;
wherein: d (t) is creep compliance (kPa) at time t; bgva、DavgAnd PavgThe average thickness (mm), diameter (mm) and creep load value (N) of a plurality of groups of parallel test specimens are obtained; Δ Xtm,tIs the trimmed mean (mm) of horizontal deformation; x is a strain value (mm) in the horizontal direction at time t; y is a strain value (mm) in the vertical direction at time t; ccmplIs an intermediate variable, and C is an intermediate variable mean value;
and 7, comparing and analyzing the creep stiffness modulus of the asphalt cement obtained in the step 2 and the creep compliance of the asphalt mixture obtained in the step 6 to obtain a relational expression of the creep stiffness modulus of the asphalt cement and the creep compliance of the asphalt mixture.
2. The method for determining the relationship between the low-temperature performance of the asphalt cement and the low-temperature performance of the asphalt mixture according to claim 1, which is characterized in that: the left end point of the temperature interval of the low-temperature performance test in the step 2 is the lowest design temperature of the pavement plus 10 ℃; the right endpoint is selected manually based on the number of temperature groups and the adjacent temperature interval.
3. The method for determining the relationship between the low-temperature performance of the asphalt cement and the low-temperature performance of the asphalt mixture according to claim 1, which is characterized in that: the number of the groups with different temperatures in the step 2 is 6-10 groups, and the different temperatures are selected to be equidistant or non-equidistant.
4. The method for determining the relationship between the low-temperature performance of the asphalt cement and the low-temperature performance of the asphalt mixture according to claim 1, which is characterized in that: and 4, controlling the height of each test piece in the step 4 to be 40-42 mm.
5. The method for determining the relationship between the low-temperature performance of the asphalt cement and the low-temperature performance of the asphalt mixture according to claim 1, which is characterized in that: selecting the static load in the step 5, wherein the horizontal strain is required to be ensured to be between 33 and 500 mu epsilon within 100s, and the horizontal strain is required to be between 250 and 750 mu epsilon within 1000 s; meanwhile, the calculated Poisson ratio is within the range of 0.05-0.5, and the data is valid.
6. The method for determining the relationship between the low-temperature performance of the asphalt cement and the low-temperature performance of the asphalt mixture according to claim 1, which is characterized in that: and 6, the test piece loading time is 100-300 s.
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Application publication date: 20200612 |