CN114486580A - Graphene microcapsule asphalt self-healing test evaluation method - Google Patents

Graphene microcapsule asphalt self-healing test evaluation method Download PDF

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CN114486580A
CN114486580A CN202111619261.8A CN202111619261A CN114486580A CN 114486580 A CN114486580 A CN 114486580A CN 202111619261 A CN202111619261 A CN 202111619261A CN 114486580 A CN114486580 A CN 114486580A
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asphalt
graphene
microcapsule
healing
modulus
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CN114486580B (en
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单丽岩
张恩浩
刘爽
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Harbin Institute of Technology
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    • 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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    • 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
    • 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
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    • G01—MEASURING; TESTING
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    • 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
    • G01N2203/0073—Fatigue
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    • G01—MEASURING; TESTING
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    • 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
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract

A self-healing test evaluation method for graphene microcapsule asphalt comprises the steps of firstly determining a fatigue test control load value range based on an intersection point of strain scanning test curves of matrix asphalt and graphene microcapsule asphalt; then carrying out fatigue test on the graphene microcapsule asphalt in a continuous loading mode, and recording the initial modulus G0End modulus G1Number of times of application of sum load N1(ii) a Then, carrying out fatigue test on the graphene microcapsule asphalt in an intermittent loading mode, and recording an initial modulus G0', termination modulus G1' and number of times of load application N2(ii) a Finally, the failure rates of the fatigue curves under two different loading modes are calculated respectively
Figure DDA0003437343570000011
And
Figure DDA0003437343570000012
to be provided with
Figure DDA0003437343570000013
As the healing index, the self-healing properties of the graphene microcapsule asphalt were evaluated. The method is beneficial to accurate evaluation of the self-healing performance of the graphene microcapsule asphalt, and has very important significance on material design and engineering application of the graphene microcapsule asphalt.

Description

Graphene microcapsule asphalt self-healing test evaluation method
Technical Field
The invention belongs to the technical field of asphalt self-healing test evaluation methods, and particularly relates to a graphene microcapsule asphalt self-healing test evaluation method.
Background
The graphene microcapsule is a composite structure which is composed of a repairing agent as a core material, a resin material and graphene as a wall material. The asphalt mixed with a proper amount of graphene microcapsules is called graphene microcapsule asphalt. The self-repairing healing mechanism of the graphene microcapsule asphalt is realized by microcapsule rupture and repairing agent outflow after asphalt damage. Due to the fact that the control load value is selected improperly in the existing asphalt self-healing test method, the graphene microcapsules can be broken in advance in the test process, and therefore the self-healing evaluation result is inaccurate. Therefore, it is necessary to design a self-healing test evaluation method specially for graphene microcapsule asphalt to improve the accuracy of judging the self-healing of the graphene microcapsule asphalt. The technology has important significance for development and performance evaluation of graphene microcapsule asphalt.
Disclosure of Invention
The invention aims to solve the problem that the existing asphalt self-healing evaluation method is not suitable for evaluating the self-healing performance of the graphene microcapsule asphalt, provides a test evaluation method for the self-healing performance of the graphene microcapsule asphalt and provides corresponding evaluation indexes.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a self-healing test evaluation method for graphene microcapsule asphalt comprises the following steps:
respectively carrying out a strain scanning test on the asphalt before and after the graphene microcapsule is doped by using a dynamic shear rheometer, then respectively drawing dynamic modulus-strain relation curves of the matrix asphalt and the graphene microcapsule asphalt by using a strain abscissa and a dynamic modulus G as an ordinate, using the strain corresponding to the intersection point of the two curves as a control load threshold value, and taking the strain smaller than the threshold value as a control load value range;
step two, in order to save the testing time, based on the result in the step one, the strain close to the threshold value is selected as the control load, the fatigue test in the continuous loading mode is carried out on the graphene microcapsule asphalt to evaluate the self-healing performance of the graphene microcapsule asphalt, and the graphene micro-scale in the loading process is testedThe dynamic modulus of the capsule asphalt changes along with the frequency of the load action, the loading is stopped when the dynamic modulus drops to a specified value, and the initial modulus G is recorded0End modulus G1Number of times of application of sum load N1；
Step three, evaluating the self-healing performance of the graphene microcapsule asphalt through a fatigue test in an intermittent loading mode, setting fixed loading time and intermittent time, repeatedly loading the sample, stopping loading when the dynamic modulus is reduced to a specified value, and recording the initial modulus G0', termination modulus G1' and number of times of load application N2；
Step four, respectively calculating the failure rate of the fatigue test curve in the continuous loading mode
Figure BDA0003437343550000021
And failure rate of fatigue test curve in intermittent loading mode
Figure BDA0003437343550000022
In the ratio of the two
Figure BDA0003437343550000023
As an index of healing;
and fifthly, evaluating the self-healing property of the graphene microcapsule asphalt based on the healing index, wherein the larger the healing index is, the stronger the self-healing property is.
Further, in the first step, the matrix asphalt is No. 70 matrix asphalt, the content of the graphene microcapsules in the graphene microcapsule asphalt is 5%, the test temperature of strain scanning is 25 ℃, the load application frequency is 10Hz, and the value range of the control load is 0-4.3%.
Further, in step two, the strain at the point of the close intersection is 3% or 4%.
Further, in the second step, the test temperature is 25 ℃, the load application frequency is 10Hz, and the test is stopped when the modulus is reduced to 40% -50% of the initial modulus.
Furthermore, in the third step, the loading time of the fatigue test in the intermittent loading mode is 1s, the intermittent time range is 0 s-6 s, and the test is stopped when the modulus is reduced to 40% -50% of the initial modulus.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a novel method for testing the self-healing property of graphene microcapsule asphalt and evaluation indexes, which aims at solving the problems that the self-healing property of the graphene microcapsule cannot be accurately evaluated because the graphene microcapsule is broken in advance due to overlarge control load in the conventional asphalt self-healing property testing method.
Drawings
FIG. 1 is a schematic diagram of a strain sweep test;
FIG. 2 is a schematic view of a sequential loading mode;
FIG. 3 is a schematic view of an intermittent loading mode;
FIG. 4 is a schematic of the fatigue test in continuous loading mode (modulus down to 40%);
FIG. 5 is a schematic of the fatigue test in intermittent loading mode (modulus down to 40%);
FIG. 6 is a schematic of the fatigue test in continuous loading mode (modulus down to 50%);
fig. 7 is a schematic of the fatigue test in intermittent loading mode (modulus down to 50%).
Detailed Description
The technical solution of the present invention is further described below with reference to the drawings and the embodiments, but the present invention is not limited thereto, and modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit of the technical solution of the present invention, and the technical solution of the present invention is covered by the protection scope of the present invention.
Example 1:
a self-healing test evaluation method for graphene microcapsule asphalt comprises the following specific operation processes:
the method comprises the following steps: under the test conditions of 25 ℃ and 10Hz, respectively carrying out strain scanning tests on the matrix asphalt and the 5% graphene microcapsule asphalt by using a dynamic shear rheometer by using an 8mm flat plate, then respectively drawing dynamic modulus-strain relation curves (shown in figure 1) of the matrix asphalt and the graphene microcapsule asphalt by using strain abscissa and dynamic modulus as ordinate, wherein 4.3% of the intersection point of the two relation curves is a strain threshold value, and the value range of the control load is 0-4.3%;
step two: according to the result of the first step, 4% strain is selected as control load, a fatigue test (shown in figure 2) is carried out on 5% graphene microcapsule asphalt by adopting an 8mm flat plate and utilizing a dynamic shear rheometer in a continuous loading mode under the test conditions of 25 ℃ and 10Hz, the change of the dynamic modulus of the graphene microcapsule asphalt along with the load action frequency is tested, the test is stopped when the modulus is reduced to 40% of the initial modulus, and the initial modulus G is recorded0End modulus G1Number of times of application of sum load N1；
Step three: and (3) carrying out fatigue test on the graphene microcapsule asphalt in an intermittent loading mode under the same conditions as those in the second step (as shown in figure 3), wherein the loading time is 1s, the intermittent time is 3s, the loading is repeated until the modulus is reduced to 40% of the initial modulus, and the initial modulus G is recorded0', termination modulus G1' and number of times of load application N2；
Step four: respectively calculating the failure rate of the fatigue test curve in the continuous loading mode
Figure BDA0003437343550000031
And failure rate of fatigue test curve in intermittent loading mode
Figure BDA0003437343550000032
(as shown in FIGS. 4 and 5) in the ratio of the two
Figure BDA0003437343550000033
As an index of healing;
step five: the self-healing property of the graphene microcapsule asphalt is evaluated based on the healing index, and the larger the healing index is, the stronger the self-healing property is.
Example 2:
a self-healing test evaluation method for graphene microcapsule asphalt comprises the following specific operation processes:
the method comprises the following steps: respectively carrying out a strain scanning test on No. 70 matrix asphalt and 5% graphene microcapsule asphalt by using a dynamic shear rheometer under the test conditions of 25 ℃ and 10Hz by using an 8mm flat plate, then respectively drawing dynamic modulus-strain relation curves (shown in figure 1) of the matrix asphalt and the graphene microcapsule asphalt by using a strain abscissa and a dynamic modulus as an ordinate, wherein 4.3% of an intersection point of the two relation curves is a strain threshold value, and the value range of a control load is 0-4.3%;
step two: according to the result of the first step, 3% strain is selected as control load, a fatigue test (shown in figure 2) is carried out on 5% graphene microcapsule asphalt by adopting an 8mm flat plate and utilizing a dynamic shear rheometer in a continuous loading mode under the test conditions of 25 ℃ and 10Hz, the change of the dynamic modulus of the graphene microcapsule asphalt along with the load action frequency is tested, the test is stopped when the dynamic modulus is reduced to 50% of the initial modulus, and the initial modulus G is recorded0End modulus G1Number of times of application of sum load N1；
Step three: performing fatigue test on the graphene microcapsule asphalt in an intermittent loading mode under the same conditions as those in the second step (as shown in figure 3), wherein the loading time is 1s, the intermittent time is 1s, the loading is repeated until the modulus is reduced to 50% of the initial modulus, and the initial modulus G is recorded0', termination modulus G1' and number of times of load application N2；
Step four: respectively calculating the failure rate of the fatigue test curve in the continuous loading mode
Figure BDA0003437343550000041
And failure rate of fatigue test curve in intermittent loading mode
Figure BDA0003437343550000042
(as shown in FIGS. 6 and 7) in the ratio of the two
Figure BDA0003437343550000043
As an index of healing;
step five: the self-healing property of the graphene microcapsule asphalt is evaluated based on the healing index, and the larger the healing index is, the stronger the self-healing property is.

Claims (5)

1. A self-healing test evaluation method for graphene microcapsule asphalt is characterized by comprising the following steps: the method comprises the following steps:
respectively carrying out a strain scanning test on the asphalt before and after the graphene microcapsule is doped by using a dynamic shear rheometer, then respectively drawing dynamic modulus-strain relation curves of the matrix asphalt and the graphene microcapsule asphalt by using a strain abscissa and a dynamic modulus G as an ordinate, using the strain corresponding to the intersection point of the two curves as a control load threshold value, and taking the strain smaller than the threshold value as a control load value range;
step two, selecting the strain close to the threshold value as a control load based on the result in the step one, carrying out fatigue test on the graphene microcapsule asphalt in a continuous loading mode to evaluate the self-healing performance of the graphene microcapsule asphalt, testing the change of the dynamic modulus of the graphene microcapsule asphalt along with the number of times of loading in the loading process, stopping loading when the dynamic modulus drops to a specified value, and recording the initial modulus G0End modulus G1Number of times of application of sum load N1；
Step three, evaluating the self-healing performance of the graphene microcapsule asphalt through a fatigue test in an intermittent loading mode, setting fixed loading time and intermittent time, repeatedly loading the sample, stopping loading when the dynamic modulus is reduced to a specified value, and recording the initial modulus G0', termination modulus G1' and number of times of load application N2；
Step four, respectively calculating the failure rate of the fatigue test curve in the continuous loading mode
Figure FDA0003437343540000011
And failure rate of fatigue test curve in intermittent loading mode
Figure FDA0003437343540000012
In the ratio of the two
Figure FDA0003437343540000013
As an index of healing;
and fifthly, evaluating the self-healing property of the graphene microcapsule asphalt based on the healing index.
2. The graphene microcapsule asphalt self-healing test evaluation method according to claim 1, characterized in that: in the first step, the matrix asphalt is No. 70 matrix asphalt, the content of the graphene microcapsules in the graphene microcapsule asphalt is 5%, the test temperature of strain scanning is 25 ℃, the load application frequency is 10Hz, and the value range of the controlled load is 0-4.3%.
3. The graphene microcapsule asphalt self-healing test evaluation method according to claim 1, characterized in that: in step two, the strain at the point of the close intersection is 3% or 4%.
4. The graphene microcapsule asphalt self-healing test evaluation method according to claim 1, characterized in that: in the second step, the test temperature is 25 ℃, the load application frequency is 10Hz, and the test is stopped when the modulus is reduced to 40-50% of the initial modulus.
5. The graphene microcapsule asphalt self-healing test evaluation method according to claim 1, characterized in that: in the third step, the loading time of the fatigue test in the intermittent loading mode is 1s, the intermittent time range is 0 s-6 s, and the test is stopped when the modulus is reduced to 40% -50% of the initial modulus.
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Cited By (1)

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