CN113030449A - Experimental method for self-repairing microcapsules in pressure-triggered asphalt - Google Patents
Experimental method for self-repairing microcapsules in pressure-triggered asphalt Download PDFInfo
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- CN113030449A CN113030449A CN202110266542.3A CN202110266542A CN113030449A CN 113030449 A CN113030449 A CN 113030449A CN 202110266542 A CN202110266542 A CN 202110266542A CN 113030449 A CN113030449 A CN 113030449A
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- 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
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
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- 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
- G01N2001/366—Moulds; Demoulding
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Abstract
The invention relates to an experimental method for self-repairing microcapsules in pressure-triggered asphalt, which comprises the following steps of (1) manufacturing a cylindrical die with an opening at the upper end and a closed lower end; (2) the self-repairing microcapsule is doped into molten asphalt and is uniformly stirred to prepare an asphalt binder; pouring the asphalt binder into a cylindrical mold, covering an opening at the upper end of the cylindrical mold with a glass sheet, standing at room temperature for 1.5h, and then demolding to obtain an asphalt test piece; (3) vertically placing an asphalt test piece on an operation table top of a press machine, and rolling the asphalt test piece to be flat by using the press machine to obtain the asphalt test piece after triggering the self-repairing microcapsules; (4) and re-melting the asphalt test piece after triggering the self-repairing microcapsules, respectively pouring the re-melted asphalt binder into the needle penetration test mold, the softening point test mold and the ductility test mold, and measuring the needle penetration, the softening point and the ductility of the asphalt. The experimental method is simple and convenient to operate, and the research range of the self-repairing performance of the microcapsule is expanded.
Description
Technical Field
The invention belongs to the technical field of traffic engineering, and particularly relates to an experimental method for self-repairing microcapsules in pressure-triggered asphalt, which is used for analyzing a basic rule of influence of the self-repairing microcapsules in matrix asphalt on the performance of the self-repairing microcapsules, and is beneficial to deep research on the self-repairing rule of the microcapsules in the asphalt.
Background
The traffic transportation system plays a very important role in national economic development, and the asphalt pavement is widely applied in China due to the advantages of convenient construction, comfortable running, low manufacturing cost and the like. After the asphalt pavement is put into use, cracks, ruts and other phenomena occur due to aging, and the traffic and driving safety is seriously affected by the damage. The essence of the aging of the asphalt pavement is that the asphalt is subjected to a series of changes along with external factors such as temperature, illumination and the like to cause the reduction of viscoelasticity and the increase of brittleness, so that the service life of the asphalt pavement is greatly reduced, and the maintenance and repair tasks of the asphalt pavement are increasingly aggravated.
The microcapsule containing the repairing agent is doped in the asphalt, so that the pavement cracks can be repaired at the initial stage of the pavement cracks, and the maintenance cost is greatly reduced. However, the research on the self-repairing performance of the microcapsules is not deep enough at present, most domestic and foreign scholars trigger the microcapsules in the asphalt by breaking the asphalt test piece through external force, the method can only break the microcapsules on the broken surface, cannot integrally trigger the microcapsules, and is not consistent with the compression and tension conditions in the practical use of the asphalt pavement.
Because the research on the self-repairing performance of the microcapsules in the asphalt does not have uniform experimental specifications, the invention provides the experimental method for the pressure-triggered self-repairing microcapsules in the asphalt, which is used for researching the self-repairing performance and the self-repairing rule of the microcapsules in the asphalt, thereby being beneficial to deeply researching the self-repairing microcapsules in the asphalt.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an experimental method for self-repairing microcapsules in pressure-triggered asphalt.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an experimental method for self-repairing microcapsules in pressure-triggered asphalt is characterized by comprising the following steps:
(1) manufacturing a mold: manufacturing a cylindrical mold with an opening at the upper end and a closed lower end;
(2) preparing an asphalt test piece: the self-repairing microcapsule is doped into molten asphalt and is uniformly stirred to prepare an asphalt binder; pouring the asphalt binder into a cylindrical mold, covering an opening at the upper end of the cylindrical mold with a glass sheet, standing at room temperature for 1.5h, and then demolding to obtain an asphalt test piece;
(3) pressure triggered self-healing microcapsules in asphalt: vertically placing an asphalt test piece on an operation table top of a press machine, and rolling the asphalt test piece to be flat by using the press machine to obtain the asphalt test piece after triggering the self-repairing microcapsules;
(4) and re-melting the asphalt test piece after triggering the self-repairing microcapsules, respectively pouring the re-melted asphalt binder into the needle penetration test mold, the softening point test mold and the ductility test mold, and measuring the needle penetration, the softening point and the ductility of the asphalt.
The method also comprises the step of taking the ductility as an index for representing the repair rate omega of the self-repairing microcapsules, and calculating the repair rate of the self-repairing microcapsules by the formula (1):
in the formula, l is the ductility of the matrix asphalt, and l' is the ductility of the asphalt after triggering the self-repairing microcapsules.
The diameter of the cylindrical die is 6cm, and the height of the cylindrical die is 5.5 cm; the cylindrical mold is made of silica gel.
The height of the asphalt test piece was 5cm, and the diameter was 6 cm.
The diameter of the self-repairing microcapsule is 30-50 μm.
The specific process for preparing the asphalt binder in the step (2) is as follows: and doping the self-repairing microcapsules into molten asphalt and stirring by using a high-speed shearing machine, wherein the rotating speed of the high-speed shearing machine is 1000-1200 rad/min, and the stirring time is 20min until the self-repairing microcapsules and the molten asphalt are uniformly mixed to obtain the asphalt binder.
And (4) in the step (3), the pressure of the press is 100KN, and the speed is 1000N/s.
Compared with the prior art, the invention has the following advantages:
1. on one hand, the repairing function of the self-repairing microcapsules in the asphalt is triggered by rolling the whole, namely all the self-repairing microcapsules in the asphalt are triggered at the same time, so that the research scope of the self-repairing performance of the microcapsules is expanded; on the other hand, the self-repairing microcapsules are triggered in a rolling mode and are closer to the compression and tension conditions of the self-repairing microcapsules in the asphalt pavement, so that the research result is closer to the real condition.
2. The experimental method is simple, convenient to operate, accurate in experimental result, small in error, convenient for deep and detailed analysis of the microcapsule self-repairing condition and beneficial to the standardized development of research on the microcapsule self-repairing performance.
Drawings
FIG. 1 is a schematic structural view of a cylindrical mold of the present invention;
FIG. 2 is a schematic structural diagram of an asphalt test piece of the present invention;
FIG. 3 is a schematic diagram of the repair of self-healing microcapsules of the present invention;
FIG. 4 is a graph of the repair rate of different mass fractions of self-healing microcapsules of the present invention.
Detailed Description
The following further describes the technical solution of the present invention with reference to the specific embodiments and the accompanying drawings, which are not intended to limit the scope of the present application.
The invention relates to an experimental method (method for short) for self-repairing microcapsules in pressure-triggered asphalt, which specifically comprises the following steps:
(1) manufacturing a mold: manufacturing a cylindrical mold with an opening at the upper end and a closed lower end;
(2) preparing an asphalt test piece: the self-repairing microcapsule is doped into molten asphalt and is uniformly stirred to prepare an asphalt binder; pouring the asphalt binder into a cylindrical mold, covering an opening at the upper end of the cylindrical mold with a glass sheet, standing at room temperature for 1.5h, and then demolding to obtain an asphalt test piece;
(3) pressure triggered self-healing microcapsules in asphalt: vertically placing an asphalt test piece on an operation table top of a press machine, and rolling the asphalt test piece to be flat by using the press machine to obtain the asphalt test piece after triggering the self-repairing microcapsules;
(4) and re-melting the asphalt test piece after triggering the self-repairing microcapsules, respectively pouring the re-melted asphalt binder into the needle penetration test mold, the softening point test mold and the ductility test mold, and measuring the needle penetration, the softening point and the ductility of the asphalt.
Examples
The embodiment is an experimental method of self-repairing microcapsules in pressure-triggered asphalt, which comprises the following steps:
(1) manufacturing a mold: a cylindrical mold with an opening at the upper end and a closed lower end is manufactured by adopting high-temperature-resistant silica gel, the diameter of the cylindrical mold is 6cm, the height of the cylindrical mold is 5.5cm (see figure 1), and the silica gel is favorable for demolding after the asphalt is placed at room temperature;
(2) preparing an asphalt test piece: selecting No. 70 asphalt, and placing the asphalt in an oven to heat to 160 ℃ to obtain molten asphalt; weighing a certain amount of self-repairing microcapsules with the diameter of 30-50 microns by using an electronic balance;
the weighed self-repairing microcapsules are doped into molten asphalt and stirred by a high-speed shearing machine, and a thermometer is used for measuring the temperature in the process to ensure that the temperature is within 160 ℃; the rotating speed of the high-speed shearing machine is 1000-1200 rad/min, the stirring time is 20min, until the self-repairing microcapsules and molten asphalt are uniformly mixed, and an asphalt binder with the mass fraction of the self-repairing microcapsules being 0.15% is prepared; pouring the asphalt binder into the cylindrical mold, and stopping pouring when the asphalt binder reaches the 5cm scale mark of the cylindrical mold; then covering the upper end of the cylindrical mold with a glass sheet, standing at room temperature for 1.5h, and demolding to obtain an asphalt test piece with the height of 5cm and the diameter of 6cm, as shown in figure 2;
(3) pressure triggered self-healing microcapsules in asphalt: vertically placing an asphalt test piece on an operation table board of a press machine, respectively paving a rubber sheet on the upper end surface and the lower end surface of the asphalt test piece, and rolling the asphalt test piece to be flat by using the press machine to obtain the asphalt test piece after triggering the self-repairing microcapsules; as shown in fig. 3, all the self-repairing microcapsules in the asphalt test piece are cracked through rolling, the repairing agent is released, the repairing agent enables the asphalt to recover the original performance of the asphalt in a mode of supplementing oil to the asphalt, the asphalt is softened, and the self-repairing purpose is achieved by utilizing the viscosity of the asphalt; the press machine adopts a force control mode, the pressure is 100KN, and the speed is 1000N/s;
(4) and (3) removing the film on the asphalt test piece after the self-repairing microcapsules are triggered, putting the asphalt test piece after the self-repairing microcapsules are triggered into an oven for remelting, pouring the remelted asphalt binder into a needle penetration test mold, a softening point test mold and a ductility test mold respectively, and measuring the needle penetration, the softening point and the ductility of the asphalt according to an experimental method in road engineering asphalt and asphalt mixture test regulations (JTG-2011).
According to the invention, asphalt binders with the mass fractions of 0.15%, 0.35%, 0.55% and 0.75% of self-repairing microcapsules are respectively prepared, and the penetration, softening point and ductility of the asphalt doped with the self-repairing microcapsules with different mass fractions and triggered by the self-repairing microcapsules are measured according to an experimental method in JTG-2011, so as to obtain the performance indexes of the asphalt triggered by the self-repairing microcapsules shown in the table 1.
TABLE 1 Performance index of Pitch after triggering self-healing microcapsules
Comparative experiment
The comparative experiment step (1) is the same as the step (1) of the example, except that the asphalt binder with the mass fraction of 0.15% of the self-repairing microcapsules prepared in the step (2) of the example is respectively poured into a penetration test mould, a softening point test mould and a ductility test mould, and the penetration, the softening point and the ductility of the asphalt are measured according to an experiment method in road engineering asphalt and asphalt mixture test procedure (JTG-2011).
Respectively preparing 0.15 percent, 0.35 percent, 0.55 percent and 0.75 percent of self-repairing microcapsules by mass, and measuring the penetration, softening point and ductility of the asphalt doped with the self-repairing microcapsules with different mass fractions and not triggering the self-repairing microcapsules according to an experimental method in JTG-2011 to obtain the performance index of the non-triggering self-repairing microcapsule asphalt shown in the table 2, namely the performance index of the matrix asphalt.
TABLE 2 Performance index of base asphalt
And (3) analyzing an experimental result:
comparing table 1 with table 2, it can be seen that the penetration and ductility of the asphalt after the self-repairing microcapsule in the asphalt is triggered by pressure are both increased, the softening point is decreased, and the performance of the asphalt is improved, wherein the ductility is most obvious; as can be seen from Table 1, with the increase of the mass fraction of the self-repairing microcapsules, the penetration degree of the asphalt is firstly reduced and then increased, the softening point and the ductility are gradually reduced, and the ductility reduction trend is most obvious; as can be seen from Table 2, with the increase of the mass fraction of the self-repairing microcapsules, the penetration degree of the matrix asphalt is slightly reduced, the ductility is greatly reduced, and the influence on the softening point of the matrix asphalt is small; the self-repairing microcapsules in the asphalt are not triggered, which is equivalent to adding impurities into the asphalt, so that the performance of the matrix asphalt is reduced.
The ductility is taken as an index for representing the repair rate omega of the self-repairing microcapsules, and the repair rate of the self-repairing microcapsules is calculated by the formula (1):
in the formula, l is the ductility of the matrix asphalt, and l' is the ductility of the asphalt after triggering the self-repairing microcapsule;
FIG. 4 is a graph of the repair rate of self-repairing microcapsules of different mass fractions, from which it can be seen that as the mass fraction of the self-repairing microcapsules increases, the repair rate of the self-repairing microcapsules increases first and then decreases; for the No. 70 asphalt, when the mass fraction of the self-repairing microcapsules is 0.55%, the repairing rate of the self-repairing microcapsules is the best.
Nothing in this specification is said to apply to the prior art.
Claims (7)
1. An experimental method for self-repairing microcapsules in pressure-triggered asphalt is characterized by comprising the following steps:
(1) manufacturing a mold: manufacturing a cylindrical mold with an opening at the upper end and a closed lower end;
(2) preparing an asphalt test piece: the self-repairing microcapsule is doped into molten asphalt and is uniformly stirred to prepare an asphalt binder; pouring the asphalt binder into a cylindrical mold, covering an opening at the upper end of the cylindrical mold with a glass sheet, standing at room temperature for 1.5h, and then demolding to obtain an asphalt test piece;
(3) pressure triggered self-healing microcapsules in asphalt: vertically placing an asphalt test piece on an operation table top of a press machine, and rolling the asphalt test piece to be flat by using the press machine to obtain the asphalt test piece after triggering the self-repairing microcapsules;
(4) and re-melting the asphalt test piece after triggering the self-repairing microcapsules, respectively pouring the re-melted asphalt binder into the needle penetration test mold, the softening point test mold and the ductility test mold, and measuring the needle penetration, the softening point and the ductility of the asphalt.
2. The experimental method for self-repairing microcapsules in pressure-triggered asphalt according to claim 1, further comprising calculating the repair rate of the self-repairing microcapsules by formula (1) with ductility as an index for characterizing the repair rate ω of the self-repairing microcapsules:
in the formula, l is the ductility of the matrix asphalt, and l' is the ductility of the asphalt after triggering the self-repairing microcapsules.
3. The experimental method for self-repairing microcapsules in pressure-triggered asphalt according to claim 1, wherein the diameter of the cylindrical mold is 6cm, and the height of the cylindrical mold is 5.5 cm; the cylindrical mold is made of silica gel.
4. The experimental method for self-repairing microcapsules in pressure-triggered asphalt according to claim 3, wherein the height of an asphalt test piece is 5cm, and the diameter of the asphalt test piece is 6 cm.
5. The experimental method for self-repairing microcapsules in pressure-triggered asphalt according to claim 1, wherein the diameter of the self-repairing microcapsules is 30 μm to 50 μm.
6. The experimental method for self-repairing microcapsules in asphalt triggered by pressure according to claim 1, wherein the concrete process for preparing the asphalt binder in the step (2) is as follows:
and doping the self-repairing microcapsules into molten asphalt and stirring by using a high-speed shearing machine, wherein the rotating speed of the high-speed shearing machine is 1000-1200 rad/min, and the stirring time is 20min until the self-repairing microcapsules and the molten asphalt are uniformly mixed to obtain the asphalt binder.
7. The experimental method for self-repairing microcapsules in pressure-triggered asphalt according to claim 1, wherein the pressure of the press in the step (3) is 100KN, and the speed is 1000N/s.
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| CN202110266542.3A CN113030449A (en) | 2021-03-10 | 2021-03-10 | Experimental method for self-repairing microcapsules in pressure-triggered asphalt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280823A (en) * | 2021-12-21 | 2022-04-05 | Tcl华星光电技术有限公司 | Display panel, preparation method of display panel and repair method of display panel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106832969A (en) * | 2016-12-31 | 2017-06-13 | 山西省交通科学研究院 | A kind of asphalt material with self-repair function and preparation method thereof |
| CN111650073A (en) * | 2020-06-15 | 2020-09-11 | 河北工业大学 | Method for testing snow melting and ice melting capability of phase-change asphalt mixture |
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2021
- 2021-03-10 CN CN202110266542.3A patent/CN113030449A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106832969A (en) * | 2016-12-31 | 2017-06-13 | 山西省交通科学研究院 | A kind of asphalt material with self-repair function and preparation method thereof |
| CN111650073A (en) * | 2020-06-15 | 2020-09-11 | 河北工业大学 | Method for testing snow melting and ice melting capability of phase-change asphalt mixture |
Non-Patent Citations (2)
| Title |
|---|
| 孙梦阳等: "内蒙沥青公路中面层低温性能分析", 《公路》 * |
| 郑木莲等: "沥青材料微胶囊自修复技术研究进展", 《中国科技论文》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280823A (en) * | 2021-12-21 | 2022-04-05 | Tcl华星光电技术有限公司 | Display panel, preparation method of display panel and repair method of display panel |
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Application publication date: 20210625 |