CN109406551B - Analysis method for testing internal structure characteristics of asphalt mixture - Google Patents
Analysis method for testing internal structure characteristics of asphalt mixture Download PDFInfo
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- CN109406551B CN109406551B CN201811511741.0A CN201811511741A CN109406551B CN 109406551 B CN109406551 B CN 109406551B CN 201811511741 A CN201811511741 A CN 201811511741A CN 109406551 B CN109406551 B CN 109406551B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/03—Investigating materials by wave or particle radiation by transmission
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/101—Different kinds of radiation or particles electromagnetic radiation
- G01N2223/1016—X-ray
Abstract
The invention discloses an analysis method for testing the internal structure characteristics of an asphalt mixture, which comprises the following steps: firstly, establishing a quantitative analysis CT number database of Marshall test piece materials; determining and marking the scanning angle of a test piece before scanning, ensuring that the same test piece is scanned at each time with unchanged angle, then scanning according to the marking sequence to obtain a 3D high-precision CT scanning image, sequentially immersing the Marshall test piece into a potassium iodide solution in a vacuum water saturation instrument, completing water saturation through the vacuum water saturation instrument, immediately plastically packaging the water-saturated Marshall test piece in a plastic bag filled with the potassium iodide solution, and immediately scanning through a CT scanner to obtain the 3D high-precision CT scanning image. The invention accurately detects the internal structure and the defect condition of the asphalt mixture by means of a high-precision CT scanner, and visually displays the detected result by utilizing the characteristics of the brightening agent of the potassium iodide solution, thereby solving the problems of inaccuracy and non-intuition in detecting the structure of the asphalt mixture in the prior art.
Description
Technical Field
The invention relates to the technical field of testing and analyzing of an internal structure of an asphalt mixture, in particular to an analysis method for testing internal structure characteristics of the asphalt mixture.
Background
The asphalt mixture consists of aggregate, asphalt mucilage, gaps and the like, and the mechanical behavior of the asphalt mixture is jointly determined by the volume content and the spatial distribution of three-phase component materials. The gaps have important influence on the anti-rutting capability, water permeability, fatigue life, strength and other performances of the asphalt pavement. Therefore, the research on the structure of the asphalt mixture is very key to the accurate prediction of the road and the safety performance of the road.
The existing method for researching the internal structure of the asphalt mixture is mainly to divide the cross section of an asphalt mixture test piece into four small areas with equal areas, calculate parameters such as the quantity of aggregates in each area, the position of a mass center, the area ratio and the like, and evaluate the uniformity of the asphalt mixture test piece. Errors are generated in calculating the position of the center of mass of the aggregate because the integrity of a small part of coarse aggregate is inevitably damaged when the region is divided. Furthermore, only the effect of coarse aggregates on the homogeneity of the bituminous mixture is taken into account, the effect of mortar and voids is neglected, and this method is inaccurate for the study of the structure.
Therefore, it is an urgent need to solve the problem of the art to provide an analysis method capable of accurately detecting the internal structure of the asphalt mixture and accurately displaying the detection result.
Disclosure of Invention
In view of the above, the present invention provides an analysis method for testing the internal structure characteristics of an asphalt mixture, which accurately detects the internal structure and the defect condition of the asphalt mixture by means of a high-precision CT scanner, and visually displays the detected result by using the characteristics of a brightener of a potassium iodide solution, thereby solving the problems of inaccuracy and non-intuition in the detection of the asphalt mixture structure in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an analysis method for testing the internal structure characteristics of an asphalt mixture is characterized by comprising the following steps:
the method comprises the following steps: establishing a quantitative analysis CT number database of a plurality of Marshall test piece test materials;
step two: grouping the Marshall test pieces, marking each Marshall test piece, scanning the Marshall test pieces by a CT scanner in sequence, and ensuring that the scanning angles of the Marshall test pieces are the same every time according to the marks to obtain a 3D high-precision CT scanning image;
step three: and completely immersing the Marshall test piece into a potassium iodide solution in a vacuum water saturation instrument in sequence, completing water saturation through the vacuum water saturation instrument, immediately plastically packaging the Marshall test piece after water saturation into a plastic bag filled with the potassium iodide solution, and immediately scanning through a CT scanner to obtain a 3D high-precision CT scanning image.
Preferably, the marshall test piece test material in the first step comprises: asphalt matrix, SBS asphalt, aggregate, air, basalt fiber, pores, asphalt cement and potassium iodide solution.
It should be noted that the marshall test piece test material includes all the elemental materials that make up the marshall test piece.
Preferably, the marking method in the second step specifically comprises the following steps:
and arranging a T-shaped mark passing through the circle center on the surface of the Marshall test piece according to the horizontal and vertical axes of ray scanning.
Preferably, the second step further specifically comprises:
and selecting a section on a 3D high-precision CT scanning image obtained after scanning, and recording the depth of the section from the top surface.
Preferably, the step three includes the following specific steps of passing through a vacuum water saturation meter:
the vacuum water saturation instrument is started firstly, the vacuum degree reaches 97.3kpa, the duration is 15min +/-2 min, and then vibration is carried out until no bubbles appear on the surface of the Marshall test piece.
Preferably, the third step further specifically includes:
and D, selecting a section on the 3D high-precision CT scanning image obtained by scanning after water saturation, wherein the depth of the selected section from the top surface is consistent with the depth of the section selected in the step two.
Preferably, the concentration of iodide ions in the potassium iodide solution in the third step is not lower than 10%.
Preferably, the plastic bag is filled with 10ml of potassium iodide solution in advance.
Preferably, the order and angle of the scans in step two and step three are kept constant.
According to the technical scheme, compared with the prior art, the invention discloses an analysis method for testing the internal structure characteristics of the asphalt mixture, the invention scans a Marshall test piece by means of a high-precision CT scanner to obtain the CT number, and the CT number is utilized to quantitatively analyze the gaps of the asphalt mixture and the change condition of the gaps in the test, the accuracy is high, the effect is good, in addition, the characteristics of the brightening agent of the potassium iodide solution are utilized, the Marshall test piece is saturated with the potassium iodide solution, the non-closed pores in the test piece are filled with the potassium iodide solution, namely, the bright part observed on the 3DCT image obtained after scanning is the non-closed pore space of the Marshall test piece to be tested, the method can observe the internal structure of the Marshall test piece more intuitively, and solves the problems of inaccuracy and non-intuition of the detection method for the internal structure of the asphalt mixture in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of a CT image obtained after scanning a Marshall test piece provided by the present invention without being immersed in a potassium iodide solution;
FIG. 2 is a scanning CT image of a Marshall specimen immersed in a potassium iodide solution according to the present invention after scanning.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses an analysis method for testing the internal structure characteristics of an asphalt mixture, which comprises the following steps:
the method comprises the following steps: establishing a quantitative analysis CT number database of a plurality of Marshall test piece test materials;
further, the marshall test piece test material in step one comprises: asphalt matrix, SBS asphalt, aggregate, air, basalt fiber, pores, asphalt mucilage, potassium iodide solution and the like.
It should be noted that: respectively scanning the Marshall test piece test materials, measuring the CT number of any point in the 3D scanning image through efilm software after obtaining the 3DCT scanning image so as to obtain a complete CT number database, and determining the internal structure composition of the asphalt mixture through comparing the CT number at any position with the CT number database.
The CT number is in a certain interval due to the non-uniformity of the materials formed by the asphalt mixture. The change area of the mucilage is larger, because the mucilage belongs to a mixture of asphalt and fine aggregates, the CT number of the pores is in the middle of the asphalt mixture, X-rays are attenuated when passing through the mixture, and the CT numbers of the pores with different sizes are different but are negative values. Since potassium iodide is prepared in a liquid and strict ratio, the CT number is stabilized at the same value. The measured CT numbers are shown in Table 1 below:
TABLE 1
| Material | Asphalt matrix | SBS asphalt | Aggregate | Air (a) |
| CT number | 0—20 | -20—0 | 2500—3000 | -1000 |
| Material | Basalt fiber | Pores of | Asphalt mastic (Fine aggregate) | Potassium iodide solution |
| CT number | 250-350 | -200—-1000 | 1000—2500 | 3071 |
Step two: grouping Marshall test pieces, marking each Marshall test piece, scanning the Marshall test pieces by a CT scanner in sequence, and ensuring that the scanning angles of the Marshall test pieces are the same every time according to the marks to obtain a 3D high-precision CT scanning image;
further, the marking method in the second step specifically comprises:
and arranging a T-shaped mark passing through the center of a circle on the surface of the Marshall test piece by using paint according to the horizontal and vertical axes of ray scanning.
Further, the second step further specifically includes:
and (3) completely scanning the Marshall test piece, selecting a cross section, recording the depth of the cross section from the top surface, and scanning the cross sections at different depths.
It should be noted that: and selecting a plurality of sections with more gaps after the test piece is completely scanned, recording the depth of the sections from the top surface, and comparing the marked same sections in each scanning. The section with more pores is selected from the upper layer, the middle layer and the lower layer respectively, the first layer is selected from the layer with more pores according to the surface and the common, and the middle layer and the lower layer are also selected from the layer with more pores respectively.
The 3DCT image obtained by step two is shown in fig. 1.
Step three: and completely immersing the Marshall test piece into a potassium iodide solution in a vacuum water saturation instrument in sequence, completing water saturation through the vacuum water saturation instrument, immediately plastically packaging the Marshall test piece after water saturation into a plastic bag filled with the potassium iodide solution, and immediately scanning through a CT scanner to obtain a 3D high-precision CT scanning image.
Furthermore, the step three includes the specific steps of passing through a vacuum water saturation instrument:
the vacuum water saturation instrument is started firstly, the vacuum degree reaches 97.3kpa, the duration is 15min, and then vibration is carried out until no bubble appears on the surface of the Marshall test piece.
Furthermore, the potassium iodide solution in the third step is prepared by mixing 500g of potassium iodide and 1000ml of water.
The 3DCT image obtained through step three is shown in fig. 2.
Further, the order and angle of the scans in step two and step three remain unchanged.
The working principle of the invention is as follows:
the CT numbers of Marshall test pieces which are not immersed in the potassium iodide solution and are immersed in the potassium iodide solution can be obtained through scanning in the second step and the third step, each test piece is analyzed through comparing data in the table 1 to obtain the internal composition of each test piece, according to the situation of a scanned 3DCT image, a white bright point is shown on a 3DCT image picture when the part of an opening pore immersed in the potassium iodide solution is seen, the CT number shows 3071, and when the black part is seen to be changed into a bright white part through comparing the images in the first step and the second step, the lighted pore belongs to an unclosed pore.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An analysis method for testing the internal structure characteristics of an asphalt mixture is characterized by comprising the following steps:
the method comprises the following steps: establishing a quantitative analysis CT number database of a plurality of Marshall test piece test materials; the Marshall test piece testing material in the first step comprises: asphalt matrix, SBS asphalt, aggregate, air, basalt fiber, pores, asphalt mucilage and potassium iodide solution;
respectively scanning the Marshall test piece test materials, after obtaining a 3D CT scanning image, measuring the CT number of any point in the 3D CT scanning image through efilm software to obtain a complete CT number database, and determining the internal structure composition of the asphalt mixture through comparing the CT number at any position with the CT number database;
the measured CT numbers are shown in Table 1 below:
TABLE 1
Step two: grouping Marshall test pieces, marking each Marshall test piece, scanning the Marshall test pieces by a CT scanner in sequence, and ensuring that the scanning angles of the Marshall test pieces are the same every time according to the marks to obtain a 3D high-precision CT scanning image;
the second step further comprises the following steps:
selecting a section on a 3D high-precision CT scanning image obtained after scanning, and recording the depth of the section from the top surface;
step three: completely immersing the Marshall test piece into a potassium iodide solution in a vacuum water saturation instrument in sequence, completing water saturation through the vacuum water saturation instrument, immediately plastically packaging the Marshall test piece after water saturation into a plastic bag filled with the potassium iodide solution, immediately scanning through a CT scanner to obtain a 3D high-precision CT scanning image, and filling non-closed pores in the test piece with the potassium iodide solution;
the concrete steps of completing water saturation through the vacuum water saturation instrument in the third step are as follows:
starting the vacuum water saturation instrument to enable the vacuum degree to reach 97.3kpa, continuing for 15min +/-2 min, and then vibrating until no bubbles appear on the surface of the Marshall test piece;
and obtaining CT numbers of Marshall test pieces which are not immersed in the potassium iodide solution and are immersed in the potassium iodide solution through scanning in the second step and the third step, and analyzing each test piece by comparing data in the table 1 to obtain the internal composition of each test piece.
2. The analysis method for testing the internal structural characteristics of the bituminous mixture according to claim 1, wherein the marking method in step two specifically comprises:
and arranging a T-shaped mark passing through the circle center on the surface of the Marshall test piece according to the horizontal and vertical axes of ray scanning.
3. The analysis method for testing the internal structural characteristics of the asphalt mixture according to claim 1, wherein the third step further comprises:
and D, selecting a section on the 3D high-precision CT scanning image obtained by scanning after water saturation, wherein the depth of the selected section from the top surface is consistent with the depth of the section selected in the step two.
4. The analytical method for testing internal structural characteristics of asphalt mixtures according to claim 1, wherein the concentration of iodide ions in the potassium iodide solution in step three is not less than 10%.
5. The analysis method for testing internal structural characteristics of asphalt mixture according to claim 1, wherein the plastic bag is pre-filled with 10ml of potassium iodide solution.
6. The method for analyzing the internal structural characteristics of the bituminous mixture according to any one of claims 1-5, wherein the scanning sequence and angle in step two and step three are kept constant.
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