CN107560954B - Method for testing self-healing effect of sand-containing fog sealing layer with shape memory performance - Google Patents
Method for testing self-healing effect of sand-containing fog sealing layer with shape memory performance Download PDFInfo
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- CN107560954B CN107560954B CN201710767469.1A CN201710767469A CN107560954B CN 107560954 B CN107560954 B CN 107560954B CN 201710767469 A CN201710767469 A CN 201710767469A CN 107560954 B CN107560954 B CN 107560954B
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Abstract
The invention provides a method for testing a self-healing effect of a sand-containing fog sealing layer with shape memory performance, solves the problem that a method for testing the self-healing effect of a sand-containing fog sealing layer material is lacked at present, and belongs to the technical field of asphalt pavement durability. Firstly, preparing a sand-containing fog sealing layer material with shape memory performance according to a certain formula, injecting the sand-containing fog sealing layer material into a dumbbell-shaped silicon rubber mold, cooling and demolding to obtain a tensile test piece; then, pre-carving two seams on the left side and the right side of the test piece, and then carrying out a tensile test on the test piece by adopting an asphalt direct tensile tester until the whole section cracks; heating the test piece to perform self-healing, and inspecting the self-healing condition of the crack by adopting a scanning electron microscope and an energy spectrometer; and finally, repeating a tensile test on the healed test piece, evaluating the self-healing effect of the sand-containing fog sealing layer material according to the ratio of the breaking strength of two times, and determining the optimal mixing amount of the shape memory fiber and the thermoplastic particles, thereby providing an intuitive and effective method for evaluating the self-healing effect of the sand-containing fog sealing layer material.
Description
Technical Field
The invention discloses a method for testing a self-healing effect of a sand-containing fog seal with shape memory performance, and belongs to the technical field of asphalt pavement durability.
Background
As early as the 19 th century and 60 s, researchers discovered that asphalt mixtures have self-healing properties, and then researches on the self-healing properties of asphalt materials have received wide attention from road workers, the self-healing properties of asphalt materials are increasingly applied to pavement paving and preventive maintenance technologies. Researchers hope that by knowing the forming mechanism and influencing factors of the self-healing of the asphalt material, a proper method is found to improve the self-healing performance of the asphalt material so as to resist fatigue cracking and prolong the service life of the asphalt pavement. However, due to the asphalt material and its complicated and varied physical and chemical properties, the self-healing effect is difficult to understand and quantify by researchers, which results in that it is difficult for road workers to accurately predict the performance and life of the asphalt pavement and effectively improve the self-healing performance of the asphalt pavement.
Therefore, the research on the self-healing effect of the asphalt material is urgent day by day, and in recent years, researchers at home and abroad try to test and research influence factors and characterization methods of the self-healing effect of various asphalt materials by various methods. Researchers study the influence of the size of the mineral powder particles on the fatigue and low-temperature fracture modes of asphalt and polymer modified asphalt mucilage through a constant strain torsion shear fatigue test; researchers quantitatively evaluate the self-healing of the asphalt material in the loading period by adopting a dissipation energy theory, and verify the influence of the intermission period in the loading period on the fatigue life and the ultimate bearing capacity of the asphalt; the researchers also simulated the condition that the asphalt film is adhered to the aggregate through a tensile test that the asphalt film between the glass balls is pulled out, and defined the self-healing rate of the asphalt through the measurement and conversion of ultrasonic waves penetrating through the test piece. The researchers also adopt a dynamic shear rheometer to select different asphalt cements as research objects, and take the composite shear modulus attenuation and recovery degree of the asphalt cements as self-healing evaluation indexes to perform fatigue-healing-reliving tests on the basis of fatigue tests, so as to compare the self-healing performance of the asphalt cements.
In addition, a dynamic shear rheometer is adopted by others to compare the self-healing capabilities of different modified asphalts, and on the basis of research, a modulus ratio and a cyclic loading number ratio are taken as proper self-healing and indexes. The test results provide self-healing phenomena, evaluation indexes of self-healing effects or factors influencing the self-healing effects of different materials, but have the disadvantage that the tests are influenced by various complex factors including self-healing time, self-healing temperature, failure stages and the like, and most of the tests are carried out through fatigue tests, which are time-consuming and complex. In addition, most researchers focus on asphalt, asphalt mixture and asphalt mortar, and are not suitable for evaluating slurry materials including fine aggregates such as sand-containing fog seals, and no research is carried out on a self-healing effect test method of the sand-containing fog seal materials at present. Therefore, a method for testing the self-healing effect of the sand-containing fog sealing layer needs to be developed, so that the self-healing effect of the sand-containing fog sealing layer material is evaluated, and a method more suitable for testing the self-healing performance of the sand-containing fog sealing layer material is provided.
Disclosure of Invention
(1) Technical problem
The invention aims to provide a method for testing the self-healing effect of a sand-containing fog sealing layer with shape memory performance, so that the problems that the existing method for testing the self-healing effect of the sand-containing fog sealing layer material is lacked, the similar method is complex, the operation is complicated, the test time consumption is long, and the repeatability and the reproducibility of the test result are poor are solved.
(2) Technical scheme
In order to solve the problem that a self-healing effect testing method of a sand-containing fog sealing layer material is lacked at present, the invention provides a method for testing the self-healing effect of the sand-containing fog sealing layer with shape memory performance, so that the self-healing effect of the sand-containing fog sealing layer material with the shape memory performance is evaluated by a simple, convenient and effective method. The technical scheme of the invention is as follows: firstly, preparing a sand-containing fog sealing layer material with shape memory performance according to a certain formula; then, injecting the newly prepared sand-containing fog seal material into a dumbbell-shaped silicon rubber mold, demulsifying the emulsified asphalt, standing and demolding to obtain a tensile test piece of the material; reserving two seams with the depth of 1mm on the surfaces of the left side and the right side of the test piece, performing a tensile test on the test piece by adopting an asphalt direct tensile tester, stopping the tensile test when a crack penetrating through the whole section is observed by adopting a fluorescence microscope, and putting the test piece into a mold again for heating and healing; observing and testing the self-healing test piece by adopting a scanning electron microscope and an EDS (electronic data System) spectrometer, and inspecting the change condition of the shape memory fiber and the thermoplastic particles in the test piece in the healing process; and finally, repeating a tensile test on the healed test piece, taking the ratio of the secondary fracture strength to the initial fracture strength as the evaluation of the self-healing capacity of the sand-containing fog sealing layer material, comparing the shape memory performance of the sand-containing fog sealing layer material with different shapes of memory fibers and thermoplastic particles, and determining the optimal mixing amount of the shape memory fibers and the thermoplastic particles.
(3) Advantageous effects
With the continuous and intensive research on the self-healing performance of asphalt materials by road workers, more and more technologies and materials are needed to improve the service performance and durability by enhancing the self-healing performance of asphalt, such as preventive maintenance technologies like sand-containing fog seals. This puts higher demands on the method for testing the self-healing effect of the asphalt material. The method for testing the self-healing effect of the sand-containing fog sealing layer with the shape memory performance can test the self-healing effect of the sand-containing fog sealing layer by a simple and effective method, greatly saves a large amount of time required by a fatigue test, and fills the gap in the aspect of the method for testing the self-healing effect of the sand-containing fog sealing layer material.
According to the patent technology provided by the invention, the testing method of the self-healing effect of the sand-containing fog sealing layer with the shape memory performance can be provided, the self-healing effect of the fog sealing layer material can be visually and effectively evaluated in a quantitative manner, the traditional testing method which needs a large amount of time to carry out a fatigue test is simplified, a large amount of time and energy are saved, and good economic benefits are achieved; the method lays a foundation for researching and developing the sand-containing fog seal and evaluating the self-healing performance of the sand-containing fog seal, provides a theoretical basis for the preventive maintenance technology of the sand-containing fog seal adopted by the asphalt pavement, and has high application value.
Detailed Description
The invention provides a method for testing a self-healing effect of a sand-containing fog sealing layer with shape memory performance, which comprises the following specific implementation steps of:
(1) shape memory short fibers and thermoplastic particles with phase transition temperature matched with the highest temperature field of the road surface are preferably selected, wherein the fibers are used as a reinforcement material and are pre-deformed through three stages of high-temperature loading and stretching, constant load keeping, temperature reduction and room-temperature unloading, so that the fibers are endowed with a shape memory function;
(2) preparing a sand-containing fog sealing layer material with a self-healing function at normal temperature by adopting modified emulsified asphalt, pre-deformed shape memory fibers, thermoplastic particles, basalt fine aggregates with the maximum particle size of 1.18mm and water according to a certain proportion;
(3) injecting the sand-containing fog sealing layer material into a dumbbell-shaped silicon rubber mold which is preheated at 50 ℃ and has the length of 100mm, the width of 20mm and the depth of 6mm, standing for 24 hours, cooling a sample in a refrigerator for 30min after emulsified asphalt is demulsified, demolding, and storing a test piece in a direct tensile tester temperature chamber at 0 ℃ for 2 hours;
(4) respectively carving a reserved seam with the depth of 1mm at the symmetrical position between the left side and the right side of the test piece, preserving heat for 3 hours in an environment box at the temperature of 0 ℃, adopting a direct tensile tester to test at the temperature of 0 ℃, wherein the tensile speed is 100mm/min, observing by using a microscope in the tensile process until cracks penetrating through the whole section appear on the other two side surfaces of the test piece, and recording the stress and the strain of the test piece;
(5) placing the test piece with cracks into a drying oven with the highest temperature consistent with the highest temperature of the road surface, curing for 1 hour to enable the pre-deformed shape memory short fibers and thermoplastic particles to fully play a self-healing role, and analyzing the self-healing condition of the cracks by adopting a scanning electron microscope and an energy spectrometer;
(6) and (3) putting the self-healed sample into a temperature chamber at 0 ℃ for 3 hours again, repeating the tensile test in the step (4) until the test piece is fractured, recording the stress and the strain of the test piece, evaluating the self-healing effect of the sand-containing fog sealing layer material according to the ratio of the fracture strength to the initial fracture strength of the unstretched healing test piece, comparing the self-healing effects of the sand-containing fog sealing layer materials with different shapes of memory fibers and thermoplastic particle contents, and determining the optimal mixing amount of the sand-containing fog sealing layer material.
Claims (1)
1. A method for testing the self-healing effect of a sand-containing fog seal with shape memory performance is characterized by comprising the following specific steps:
(1) shape memory short fibers and thermoplastic particles with phase transition temperature matched with the highest temperature field of the road surface are preferably selected, wherein the fibers are used as a reinforcement material and are pre-deformed through three stages of high-temperature loading and stretching, constant load keeping, temperature reduction and room-temperature unloading, so that the fibers are endowed with a shape memory function;
(2) preparing a sand-containing fog sealing layer material with a self-healing function at normal temperature by adopting modified emulsified asphalt, pre-deformed shape memory fibers, thermoplastic particles, basalt fine aggregates with the maximum particle size of 1.18mm and water according to a certain proportion;
(3) injecting the sand-containing fog sealing layer material into a dumbbell-shaped silicon rubber mold which is preheated at 50 ℃ and has the length of 100mm, the width of 20mm and the depth of 6mm, standing for 24 hours, cooling a sample in a refrigerator for 30min after emulsified asphalt is demulsified, demolding, and storing a test piece in a direct tensile tester temperature chamber at 0 ℃ for 2 hours;
(4) pre-carving a 1 mm-long crack on each of the left side and the right side of a sample, performing a tensile test on the sample at 0 ℃ by adopting an asphalt direct tensile tester, wherein the tensile speed is 100mm/min, observing the sample by using a microscope in the tensile process until cracks penetrating through the whole section appear on the upper surface and the lower surface of the sample, and recording the stress and the strain of the sample at the moment;
(5) placing the test piece with cracks into a drying oven with the highest temperature consistent with the highest temperature of the road surface, curing for 1 hour to enable the pre-deformed shape memory short fibers and thermoplastic particles to fully play a self-healing role, and analyzing the self-healing condition of the cracks by adopting a scanning electron microscope and an energy spectrometer;
(6) and (3) putting the self-healed sample into a temperature chamber at 0 ℃ again for 2 hours, repeating the tensile test in the step (4) until the test piece is fractured, recording the stress and the strain of the test piece, evaluating the self-healing effect of the sand-containing fog sealing layer material according to the ratio of the fracture strength to the initial fracture strength of the unstretched healing test piece, comparing the self-healing effects of the sand-containing fog sealing layer materials with different shapes of memory fibers and thermoplastic particle contents, and determining the optimal mixing amount of the sand-containing fog sealing layer materials.
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| CN108375657A (en) * | 2018-03-21 | 2018-08-07 | 广东电网有限责任公司电力科学研究院 | A kind of Plural Evaluation Methods of self-healing material |
| CN108613993B (en) * | 2018-05-11 | 2021-05-25 | 交通运输部公路科学研究所 | Self-healing capability evaluation method and system for asphalt mixture |
| CN111196733B (en) * | 2020-01-09 | 2021-06-04 | 青岛理工大学 | Oxidation induced shape memory fiber and preparation method and application thereof |
| CN111982712A (en) * | 2020-08-19 | 2020-11-24 | 南京林业大学 | Evaluation method for self-healing performance of shape memory gutta-percha modified asphalt |
| CN113433304B (en) * | 2021-06-24 | 2022-03-29 | 哈尔滨工业大学 | Method for testing and evaluating self-healing performance of asphalt |
| CN113789695B (en) * | 2021-10-21 | 2022-08-19 | 安徽建筑大学 | Material composition design method for microwave heating self-healing pavement in frozen soil area |
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| CN106426903B (en) * | 2016-09-06 | 2018-09-11 | 南京林业大学 | A kind of pre- deformation method assigning cement pavement calking shape memory function |
| CN106337349A (en) * | 2016-09-14 | 2017-01-18 | 南京林业大学 | Method for self-repairing shape memory effect based joint sealant for concrete pavement through two steps |
| CN206143560U (en) * | 2016-11-02 | 2017-05-03 | 山西省交通科学研究院 | Bituminous paving with self -diagnosis and self -repairing function |
| CN106525583A (en) * | 2016-11-10 | 2017-03-22 | 南京林业大学 | Test method applying compressing load and stretching load in vertical direction and horizontal direction simultaneously |
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Application publication date: 20180109 Assignee: Hefei Shuang Dao run Highway Engineering Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2020320000369 Denomination of invention: Test method for self healing effect of sand fog seal with shape memory property Granted publication date: 20200313 License type: Common License Record date: 20201212 Application publication date: 20180109 Assignee: Zhenjiang Heng An Civil Technology Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2020320000365 Denomination of invention: Test method for self healing effect of sand fog seal with shape memory property Granted publication date: 20200313 License type: Common License Record date: 20201212 Application publication date: 20180109 Assignee: BEIJING JIUTONGQU TESTING TECHNOLOGY Co.,Ltd. Assignor: NANJING FORESTRY University Contract record no.: X2020320000364 Denomination of invention: Test method for self healing effect of sand fog seal with shape memory property Granted publication date: 20200313 License type: Common License Record date: 20201212 |
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