CN112362498B - Test method for determining optimal intermittent time of intermittent heating self-healing of steel bridge deck pavement - Google Patents
Test method for determining optimal intermittent time of intermittent heating self-healing of steel bridge deck pavement Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 79
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 57
- 239000010959 steel Substances 0.000 title claims abstract description 57
- 238000010998 test method Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 77
- 239000010426 asphalt Substances 0.000 claims abstract description 36
- 238000013001 point bending Methods 0.000 claims abstract description 15
- 230000006698 induction Effects 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000012935 Averaging Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 9
- 238000009826 distribution Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
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- 230000000875 corresponding effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 230000035876 healing Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N3/02—Details
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- G—PHYSICS
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- 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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- 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
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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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
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Abstract
The invention relates to the technical field of steel bridge deck asphalt self-healing, and provides a test method for determining the optimal intermittent time for intermittent heating and self-healing of a steel bridge deck pavement, which aims to solve the problems that the temperature of the lower part of the existing steel bridge deck asphalt pavement is difficult to directly obtain and the optimal intermittent time for intermittent heating cannot be accurately obtained through calculation; s2, taking out 2 Xm prepared trabecular test pieces, and respectively carrying out three-point bending tests by a three-point bending tester to obtain initial breaking strength F 0; and S3, respectively splicing and stacking the 2 broken trabecular test pieces in m groups, fastening by using a clamp, and performing an intermittent heating self-healing test. The invention is especially suitable for self-healing detection of the asphalt paving layer of the steel bridge surface, and has higher social use value and application prospect.
Description
Technical Field
The invention relates to the technical field of steel bridge deck asphalt self-healing, in particular to a test method for determining the optimal intermittent time for intermittent heating self-healing of a steel bridge deck pavement.
Background
The pavement cracking damage of the steel bridge deck is the most typical disease type of asphalt pavement, after the pavement of the steel bridge deck has the diseases such as cracks, the bonding layer between the pavement and the steel bridge deck is easy to erode by rainwater, and under the action of running load and the like, the pavement can crack and deteriorate or even cause the corrosion of the steel bridge deck, so that the service life of the steel bridge deck is reduced, the pavement performance of the steel bridge deck is not only influenced, but also the stress on the steel bridge deck is quite unfavorable. However, steel bridge deck pavement is often used on an overhead bridge with busier lanes and fewer lanes, and the traditional repairing process such as asphalt pavement method and the like can have great influence on traffic due to long sealing maintenance period.
In order to solve the problem, the special properties of the steel bridge deck plate are fully utilized, and an induction heating technology is introduced into the field of repairing the pavement cracks of the steel bridge deck to: when the alternating magnetic field passes through the deck slab pavement to reach the steel deck slab, vortex flow is generated in the steel plate, so that heat is rapidly generated to heat the upper asphalt pavement, and the pavement temperature rises. When the deck pavement reaches a certain temperature, the asphalt binder begins to behave as a newtonian fluid, and the asphalt binder flows through any possible cracks in the asphalt concrete, allowing the fatigue cracks created in the deck pavement to be effectively repaired.
However, since asphalt is a poor conductor of heat, it is extremely easy to cause the temperature of each layer of the steel deck to be inconsistent during heating, so that a gradient healing phenomenon occurs. Under the condition of continuous heating, the condition that the temperature of the local asphalt mixture close to the steel bridge deck is too high and the paving surface is still low easily occurs, so that huge energy waste is generated, and the self-healing repair of the steel bridge deck is also very unfavorable.
Therefore, in the construction process of steel bridge surface induction heating self-healing repair, in order to avoid local overheating and improve the temperature gradient healing condition, the balance of the relation between the heat generation of the steel bridge surface and the heat transfer of the asphalt pavement should be fully considered, and an equal-time intermittent heating method is adopted. However, in the practical application process, because the temperature of the lower part of the asphalt pavement is difficult to directly obtain, the optimal intermittent time of intermittent heating cannot be accurately obtained through calculation, and therefore, we propose a test method for determining the optimal intermittent time of intermittent heating self-healing of the steel bridge pavement.
Disclosure of Invention
(One) solving the technical problems
Aiming at the defects of the prior art, the invention provides a test method for determining the optimal intermittent time for intermittent heating self-healing of a steel bridge deck pavement, which overcomes the defects of the prior art, has reasonable design and compact structure, and aims to solve the problems that the temperature of the lower part of the existing steel bridge deck asphalt pavement is difficult to directly obtain and the optimal intermittent time for intermittent heating cannot be accurately obtained through calculation.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme:
The test method for determining the optimal intermittent time for intermittent heating and self-healing of the pavement of the steel bridge deck comprises the following steps,
S1, forming a plurality of groups of rutting plate test pieces by a wheel rolling method according to the thickness of the pavement design of the steel bridge deck asphalt mixture and the target mixing ratio of the material design, cutting Cheng Xiaoliang the rutting plate test pieces, and simulating a pavement layer structure of the steel bridge deck;
S2, taking out 2 Xm prepared trabecular test pieces, and respectively carrying out three-point bending tests by a three-point bending tester to obtain initial breaking strength F 0;
S3, respectively and correspondingly splicing and stacking 2 broken trabecular test pieces in m groups, fastening by using a clamp, placing the two pieces in a heating range of induction heating equipment taking a steel plate as a bottom plate, and performing an intermittent heating self-healing test, wherein the total heating time is t 0, and the intermittent heating period is t i＝t0/i (i=1, 2, and m);
S4, standing the self-healing 2 Xm trabecular test pieces obtained in the step S3 for 24 hours, taking out, performing a second three-point bending test, obtaining upper Fang Xiaoliang fracture strength F 1i and lower Fang Xiaoliang fracture strength F 2i, and comparing and calculating F 1i、F2i and F 0 to obtain the strength recovery rates eta 1i and eta 2i of the test pieces;
S5, calculating the temperature gradient coefficient gamma i of each group according to the intensity recovery rates eta 1i and eta 2i, and obtaining the optimal intermittent induction heating period.
Preferably, in the step S3, in the first half time period t 0/2 i of the intermittent heating period, the heating device is operated at the set output frequency f and output power p, and the second half time period is closed.
Preferably, the trabecular test pieces used in the same test group are all formed by cutting a track plate, all the tests are provided with three parallel test groups, and the parameters are obtained by averaging the three test data.
Preferably, in the step S1, the specific method for shaping the trabecular test piece includes the following steps:
s1-1, pouring asphalt mixture with the same mixing ratio as the pavement of the steel bridge surface into a mould to form a lower asphalt mixture, cooling for 24 hours, pouring the same asphalt mixture into the mould, rolling for 2-4 times, cooling for 24 hours to form an upper asphalt mixture, and forming a rut board with the thickness of 300 multiplied by 50 mm;
S1-2, cutting the rut board into blocks to form a trabecular test piece with the size of 300 multiplied by 30 multiplied by 50 mm;
S1-3, controlling the failure position during the fracture test, cutting a pre-sawn kerf with the width of 6mm and the depth of 3mm from the center of the trabecular test piece, and setting the pre-sawn kerf downwards during the test.
Preferably, in the step S2, the loading speed of the three-point bending test is kept between 40 and 60mm/min.
Preferably, in the step S4, the intensity recovery rates η 1i and η 2i are expressed as follows:
And/>
Preferably, in the step S5, the temperature gradient coefficient γ i is expressed as follows:
Preferably, in step S5, the intermittent heating period t i corresponding to the group of tests with the smallest gradient improvement coefficient γ i and the gradient improvement coefficient γ i is the optimal intermittent time for intermittent heating self-healing under the parameters of the current pavement structure and the induction heating device.
(III) beneficial effects
The embodiment of the invention provides a test method for determining the optimal intermittent time for intermittent heating self-healing of a steel bridge deck pavement, which has the following beneficial effects:
1. Compared with the conventional continuous heating mode, the intermittent heating mode is adopted in the steel bridge pavement induction heating self-healing operation, so that the uniform distribution of the longitudinal temperature of the pavement is facilitated, the problems of asphalt aging and the like caused by overlarge longitudinal temperature gradient can be effectively overcome, and the test method can obtain the important parameter of the optimal intermittent time of intermittent heating, thereby having important significance for the improvement and development of the steel bridge pavement asphalt pavement induction heating self-healing process.
2. According to the test method disclosed by the invention, the total starting-up time of the induction heating equipment is fixed, a plurality of groups of tests are carried out and compared by changing the intermittent period time of intermittent heating, the optimal intermittent time of intermittent heating self-healing of the steel bridge deck pavement and corresponding actual working condition can be determined only by carrying out one test before construction, and the self-healing effect of the asphalt paving layer can be effectively improved by changing the relevant parameters of the heating equipment according to the test result. The method is simple and visual, and has good operability and practicality.
3. According to the breaking strength obtained by two three-point bending tests before and after the small Liang Yangjian self-healing test, the strength recovery rate eta is innovatively provided by comparing the two breaking strength. Because the energy absorbed by the self-healing of the test piece is all derived from the induction heating heat of the test piece, and the temperature of the test piece is positively correlated with the induction heating heat, the intensity recovery rate of the asphalt mixture between different layers can intuitively reflect the comparison of the temperature distribution conditions between different layers.
4. According to the invention, according to the asphalt pavement structure of the steel bridge surface, the longitudinal complex temperature gradient distribution of the asphalt pavement is simplified into the comparison of the temperature distribution of an upper layer and a lower layer, and the comparison of the self-healing strength recovery rate which is in positive correlation with temperature is utilized to provide the temperature gradient coefficient gamma, when the absolute value of gamma is closer to 1, the closer the temperatures of an upper surface layer and a lower surface layer are, and the more uniform the longitudinal temperature distribution of the pavement during heating is shown. The gamma simply and intuitively reflects the overall temperature distribution condition of the heated pavement, but has good accuracy, and has reference significance for determining the optimal intermittent time of intermittent heating self-healing of the steel bridge deck pavement.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The test method for determining the optimal intermittent time for intermittent heating and self-healing of the pavement of the steel bridge deck comprises the following steps,
S1, forming a plurality of groups of rutting plate test pieces by a wheel rolling method according to the thickness of the pavement design of the steel bridge deck asphalt mixture and the target mixing ratio of the material design, cutting Cheng Xiaoliang the rutting plate test pieces, and simulating a pavement layer structure of the steel bridge deck;
In this embodiment, in the step S1, the specific method for shaping the trabecular test piece includes the following steps:
s1-1, pouring asphalt mixture with the same mixing ratio as the pavement of the steel bridge surface into a mould to form a lower asphalt mixture, cooling for 24 hours, pouring the same asphalt mixture into the mould, rolling for 2-4 times, cooling for 24 hours to form an upper asphalt mixture, and forming a rut board with the thickness of 300 multiplied by 50 mm;
S1-2, cutting the rut board into blocks to form a trabecular test piece with the size of 300 multiplied by 30 multiplied by 50 mm;
S1-3, controlling the failure position during the fracture test, cutting a pre-sawn kerf with the width of 6mm and the depth of 3mm from the center of the trabecular test piece, and setting the pre-sawn kerf downwards during the test.
S2, taking out 2 Xm prepared trabecular test pieces, and respectively carrying out three-point bending tests by a three-point bending tester to obtain initial breaking strength F 0;
The loading speed of the three-point bending test is kept at 40-60mm/min;
S3, respectively and correspondingly splicing and stacking 2 broken trabecular test pieces in m groups, fastening by using a clamp, placing the two pieces in a heating range of induction heating equipment taking a steel plate as a bottom plate, and performing an intermittent heating self-healing test, wherein the total heating time is t 0, and the intermittent heating period is t i＝t0/i (i=1, 2, and m);
In the step S3, in the first half time period t 0/2 i of the intermittent heating period, the heating device operates at the set output frequency f and output power p, and the second half time period is closed;
S4, standing the self-healing 2 Xm trabecular test pieces obtained in the step S3 for 24 hours, taking out, performing a second three-point bending test, obtaining upper Fang Xiaoliang fracture strength F 1i and lower Fang Xiaoliang fracture strength F 2i, and comparing and calculating F 1i、F2i and F 0 to obtain the strength recovery rates eta 1i and eta 2i of the test pieces;
In this embodiment, in the step S4, the intensity recovery rates η 1i and η 2i are expressed as follows:
And/>
S5, calculating the temperature gradient coefficient gamma i of each group according to the intensity recovery rates eta 1i and eta 2i, and obtaining the optimal intermittent induction heating period;
in this embodiment, in the step S5, the temperature gradient coefficient γ i is expressed as follows:
Comparing the gradient improvement coefficients gamma i of the m groups of tests, wherein the intermittent heating period t i corresponding to the group of tests with the minimum gradient improvement coefficient gamma i is the optimal intermittent time for intermittent heating self-healing under the parameters of the current pavement structure and the induction heating equipment.
In this embodiment, the trabecular test pieces used in the same group of test groups are all formed by cutting a track slab, all the tests are provided with three parallel test groups, and the parameters are obtained by averaging the test data of the three groups.
In the embodiment, compared with the traditional continuous heating, the intermittent heating method provided by the test method for determining the optimal intermittent time for intermittent heating and self-healing of the pavement of the steel bridge surface can lead the pavement to be heated more uniformly, ensure heat transfer, overcome the defect of continuous heating and perfect the induction heating and self-healing process of the asphalt pavement of the steel bridge surface; and meanwhile, a temperature gradient coefficient gamma is provided, and when gamma is increased, the longitudinal temperature distribution of the pavement during heating is more uniform. The gamma intuitively reflects the lifting effect of intermittent heating on the whole self-healing effect of the pavement, and has reference significance for determining the optimal intermittent time of intermittent heating and self-healing of the pavement of the steel bridge surface.
The embodiments of the present invention are disclosed as preferred embodiments, but not limited thereto, and those skilled in the art will readily appreciate from the foregoing description that various extensions and modifications can be made without departing from the spirit of the present invention.
Claims (6)
1. The test method for determining the optimal intermittent time for intermittent heating and self-healing of the steel bridge deck pavement is characterized by comprising the following steps,
S1, forming a plurality of groups of rutting plate test pieces by a wheel rolling method according to the thickness of the pavement design of the steel bridge deck asphalt mixture and the target mixing ratio of the material design, cutting Cheng Xiaoliang the rutting plate test pieces, and simulating a pavement layer structure of the steel bridge deck;
S2, taking out 2 Xm prepared trabecular test pieces, and respectively carrying out three-point bending tests by a three-point bending tester to obtain initial breaking strength F 0;
S3, respectively splicing and stacking 2 broken trabecular test pieces in m groups, fastening by using a clamp, placing the two pieces in a heating range of induction heating equipment taking a steel plate as a bottom plate, and performing an intermittent heating self-healing test, wherein the total heating time is t 0, the intermittent heating period is t i=t0/i, and i=1, 2.
S4, standing the self-healing 2 Xm trabecular test pieces obtained in the step S3 for 24 hours, taking out, performing a second three-point bending test, obtaining upper Fang Xiaoliang fracture strength F 1i and lower Fang Xiaoliang fracture strength F 2i, comparing F 1i、F2i with F 0, and calculating to obtain strength recovery rates eta 1i and eta 2i of the test pieces, wherein the calculation formula is as follows;
，/>；
S5, according to the intensity recovery rates eta 1i and eta 2i, calculating a temperature gradient coefficient gamma i of each group, wherein the calculation formula is as follows:
And thereby an optimal intermittent induction heating period.
2. The test method for determining the optimal intermittent time for intermittent heating self-healing of a steel deck pavement according to claim 1, wherein: in the step S3, in the first half time period t 0/2 i of the intermittent heating period, the heating device is operated at the set output frequency f and output power p by the set output heating device, and the second half time period is closed.
3. The test method for determining the optimal intermittent time for intermittent heating self-healing of a steel deck pavement according to claim 1, wherein: and the trabecular test pieces used in the same test group are formed by cutting a track plate, all the tests are provided with three parallel test groups, and the parameters are obtained by averaging the three test data.
4. A test method for determining the optimal batch time for intermittent heating self-healing of a steel bridge deck pavement according to claim 1, wherein: in the step S1, the specific method for shaping the trabecular test piece includes the following steps:
S1-1, pouring asphalt mixture with the same mixing ratio as the pavement of the steel bridge surface into a mould to form a lower asphalt mixture, cooling for 24 hours, pouring the same asphalt mixture into the mould, rolling for 2-4 times, cooling for 24 hours to form an upper asphalt mixture, and forming a rut board with the thickness of 300 multiplied by 50 mm;
S1-2, cutting the rut board into blocks to form a trabecular test piece with the size of 300 multiplied by 30 multiplied by 50 mm;
S1-3, controlling the failure position during the fracture test, cutting a pre-sawn kerf with the width of 6mm and the depth of 3mm from the center of the trabecular test piece, and setting the pre-sawn kerf downwards during the test.
5. A test method for determining the optimal batch time for intermittent heating self-healing of a steel bridge deck pavement according to claim 1, wherein: in the step S2, the loading speed of the three-point bending test is kept at 40-60mm/min.
6. A test method for determining the optimal batch time for intermittent heating self-healing of a steel bridge deck pavement according to claim 1, wherein: in the step S5, the temperature gradient coefficient γi of the m groups of tests is compared, and the intermittent heating period ti corresponding to the group of tests with the smallest temperature gradient coefficient γi is the optimal intermittent time for intermittent heating self-healing under the parameters of the current pavement structure and the induction heating equipment.
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