CN110672647B - Evaluation method for grouting effect of poured asphalt concrete - Google Patents
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Abstract
The invention discloses an evaluation method of grouting effect of poured asphalt concrete, which comprises the steps of carrying out CT scanning on a grouted Marshall test piece to obtain a three-dimensional structure for communicating a gap and slurry; intercepting a cubic range of 60mm multiplied by 60mm at a three-dimensional structure as an object, calculating the volume of a communicated gap and the volume of slurry in the range, and further calculating grouting fullness as one of indexes for evaluating grouting effect; and 3D printing a slurry distribution structure and a structure except the asphalt mixture solid in a cubic range, measuring the resistance values of the slurry distribution structure and the structure except the asphalt mixture solid, and taking the ratio of the two as another index for evaluating the grouting effect. According to the evaluation method for the grouting effect of the poured asphalt concrete, the grouting effect of the poured asphalt concrete is well evaluated by combining CT scanning and 3D printing, and the practicability is high.
Description
Technical Field
The invention belongs to the field of grouting effect testing, and particularly relates to an evaluation method of grouting effect of poured asphalt concrete.
Background
The flexible asphalt pavement is extremely sensitive to the external temperature, and serious diseases such as rut deformation and the like often appear in high-temperature seasons in summer, so that the driving safety is reduced, and the pavement maintenance cost is increased. In order to reduce the temperature sensitivity of the asphalt pavement and increase the rigidity of the pavement under the high-temperature condition, in recent years, a pouring type is adopted to pour cement-based slurry into a flexible porous asphalt pavement, and a semi-flexible pavement with higher rigidity is obtained by combining the rigidity of hardened cement slurry and the flexibility of an asphalt mixture, so that the method is one of the technical means for preventing and alleviating rutting of the asphalt pavement in high-temperature areas in China.
The method for pouring cement slurry into the porous asphalt pavement is mainly characterized by preparing cement slurry with high fluidity, spreading the cement slurry on the surface layer of the paved porous asphalt pavement, and pouring the cement slurry into the asphalt pavement through a large number of communicated pores of the asphalt pavement. The filling effect of the cement paste in the communicated pores, namely the volume ratio of the cement paste to the communicated pores determines the improvement range of the rigidity of the asphalt pavement to a great extent and determines the prevention and control effect of the tracks on the semi-flexible pavement. However, no index and test method for evaluating the cement slurry perfusion effect exists in the field of road engineering at present.
Moreover, in recent years, various functional asphalt pavements are diversified, wherein the asphalt pavements which are snowmelt and iced in winter can actively delay the condensation of surface water, so that the asphalt pavements are primarily applied to northern areas in China; the phase-change heat storage material is adopted in the high-temperature phase-change asphalt pavement, so that the internal temperature of the pavement in a high-temperature season is effectively reduced. The functional materials (snow melting agent and phase change material) of the two road surfaces are both added into the asphalt mixture by adopting the traditional 'doping type' and are paved on the surface layer of the asphalt road surface. However, in order to ensure good road surface snow melting and ice melting or high-temperature phase change heat storage functions, the doping amount of the functional material cannot be too low, but a larger doping amount significantly affects the performance of the asphalt pavement, particularly causes great reduction in the cohesiveness of asphalt and mineral aggregate, and causes insufficient water loss resistance of the asphalt pavement, so that road workers are very cautious when adopting the 'doping type' functional asphalt pavement at present. Under the background, the porous asphalt pavement is in a pouring type, and functional materials are poured into communicated pores so as to realize the functionality of the pavement, which draws higher attention. However, no unified evaluation method for the filling effect in the communicated pores of the porous pavement is formed in the current road engineering major, so that the snow and ice melting capability in winter and the cooling capability in summer of the 'filling type' functional pavement cannot be effectively guaranteed.
In conclusion, the performance of the "pouring" semi-flexible pavement and the functional pavement cannot be effectively guaranteed due to the lack of the "pouring" effect evaluation method, and the grouting effect of the asphalt concrete pavement needs to be evaluated after grouting. The existing method reflects grouting fullness through modes such as poor quality of a concrete sample before and after grouting, neglects the influence of a hollow space structure in concrete, and cannot directly reflect the actual concrete performance effect after grouting. Therefore, the method for evaluating the pouring effect of the porous asphalt mixture has important practical significance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the method for evaluating the grouting effect of the pouring type asphalt concrete, which better evaluates the grouting effect by combining CT scanning and 3D printing modes, and the relation between the void content ratio and the resistance value change.
In order to achieve the technical purpose, the invention is realized by the following technical scheme:
a grouting effect evaluation method of a poured asphalt concrete comprises the following steps:
step one, carrying out CT (computed tomography) tomography scanning on a grouted porous asphalt mixture Marshall test piece to obtain two-dimensional tomography pictures of communicated gaps and slurry, and respectively establishing three-dimensional structures of the communicated gaps and the grouted slurry in the mixture test piece;
step two, taking a cubic range of 60mm multiplied by 60mm as an object in the three-dimensional structure, and calculating the volume of the connected void in the rangeV 1 Volume of slurryV 2 By the following formula:
obtaining the grouting fullnessD 1 As one of the indexes for evaluating the grouting effect;
thirdly, 3D printing a slurry structure within the range of 60mm multiplied by 60mm and a structure except the asphalt mixture solid, wherein the structure comprises communicated gaps and slurry;
step four, respectively measuring the structure of the slurry obtained by printing and the knots except the solid of the asphalt mixtureResistance of structureNAndMfrom
Calculating the resistance ratioD 2 As another index for evaluating the grouting effect, the grouting effect of the grouted asphalt concrete is comprehensively evaluated from the grouting saturation and the resistance ratio.
Further, CT tomography adopts 200KV voltage and 0.56mA current, and the Marshall test piece is integrally scanned from top to bottom based on a sector scanning mode.
Further, in the first step, the establishment of the three-dimensional structure involves determination of a grayscale image threshold, and the method for determining the grayscale image threshold includes: setting a plurality of threshold values, respectively establishing a three-dimensional structure under each threshold value, calculating the void ratio of each structure, and taking the threshold value of the structure as the threshold value when the true void ratio of the test piece is equivalent.
Further, the identification method of the communication gap comprises the following steps: the three-dimensional cubic gap network is divided into a plurality of unconnected parts by using computer MIMICS, wherein the larger part penetrating the length of the cubic body is a connected gap, and the other smaller parts in the mixture are closed gaps, so that the identification of the connected gap is realized.
Further, in the second step, the three-dimensional structure of the concrete sample is obtained by intercepting the three-dimensional structure of the concrete sample by MIMICS image processing software within the cubic range of 60mm × 60mm × 60 mm.
Further, in the second step, in the three-dimensional reconstruction process, the structure surface is divided by a triangle generated by MIMICS software, and the volume of the communicated gap is obtained by using the volume enclosed by the triangular curved surface meshV 1 Volume of slurryV 2 。
Further, in the third step, a 3D printer is used to print a paste structure within the range of 60mm × 60mm × 60mm, and the printing material preferably uses metal powder with good conductivity.
Further, in the fourth step, the resistance value is measured in the normal direction of three surfaces perpendicular to each other in the slurry structure by the two-electrode method, and the average value of the resistance values in the three directions is taken asResistance value of the structureN。
Further, in the fourth step, the resistance value of the structure except the asphalt mixture solid is measured by a two-electrode method, and the average value of the resistances in the normal directions of three surfaces of the slurry structure perpendicular to each other is taken as the resistance value of the structureM。
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses an evaluation method of grouting effect of poured asphalt concrete, which comprises the following steps: CT fault scanning is carried out on a grouted porous asphalt mixture Marshall test piece to obtain two-dimensional fault pictures of communicated gaps and slurry, and three-dimensional structures of the communicated gaps and the grouted slurry in the mixture test piece are respectively established; intercepting a cubic range of 60mm multiplied by 60mm at a three-dimensional structure as an object, calculating the volume of a communicated gap and the volume of slurry in the range, and further calculating grouting fullness as one of indexes for evaluating grouting effect; and 3D printing a slurry distribution structure and a structure except the asphalt mixture solid in a cubic range, measuring the resistance values of the slurry distribution structure and the structure except the asphalt mixture solid, and taking the ratio of the two as another index for evaluating the grouting effect. According to the evaluation method for the grouting effect of the poured asphalt concrete, the grouting effect of the poured asphalt concrete is well evaluated by combining CT scanning and 3D printing, and the practicability is high.
Drawings
FIG. 1 is a two-dimensional tomographic image of interconnected voids and slurry obtained by CT tomography of the present invention;
FIG. 2 is a three-dimensional structure of a Marshall specimen from a CT scan of the present invention;
FIG. 3 is a three-dimensional structure of connected voids resulting from a CT scan of the present invention;
FIG. 4 is a schematic view of a cubic range of 60mm by 60mm of the present invention;
FIG. 5 is a schematic illustration of the present invention dividing a structured surface;
FIG. 6 is a schematic of the two-electrode process of the present invention.
Detailed Description
The following describes the implementation of the technical solution in further detail with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
A grouting effect evaluation method of a poured asphalt concrete comprises the following steps:
step one, carrying out CT (computed tomography) scanning on a grouted porous asphalt mixture Marshall test piece to obtain a two-dimensional tomographic picture for communicating a gap and slurry, as shown in figure 1, wherein figure 1 is a cross-sectional image in a vertical three-direction during CT scanning of the porous asphalt mixture Marshall test piece, carrying out corresponding processing on the image and carrying out three-dimensional reconstruction, respectively establishing a three-dimensional structure for communicating the gap inside the mixture Marshall test piece and the slurry filled in, as shown in figures 2 and 3, respectively, figure 2 is a solid part three-dimensional structure model of the Marshall test piece reconstructed from figure 1, figure 3 is a cross-sectional view of a total pore structure in the Marshall test piece of figure 1, adopting MIMICS (micro integrated piping system) software to divide the surface of the three-dimensional structure by adopting a plurality of triangles, and generating an STL (Standard template library).
Step two, intercepting a cubic range of 60mm multiplied by 60mm in the three-dimensional structure as an object, as shown in fig. 4, calculating to obtain the volume of the slurry by MIMICS software according to the space volume of the triangular package on the surface of the three-dimensional structure, as shown in fig. 5V 1 And communicating the void volumeV 2 Calculating grouting fullness according to the volume of the communicated gap and the volume of the slurryD 1 Degree of fullness in groutingD 1 The calculation formula of (2) is as follows:
wherein the content of the first and second substances, V 1 in order to communicate the volume of the void,V 2 is the volume of the slurry.
And step three, importing the STL file with the three-dimensional structure into a computer control system of a 3D printer, and printing a slurry structure within the range of 60mm multiplied by 60mm and a structure (including communicated gaps and slurry) except the asphalt mixture solid.
Step four, adopting a two-electrode method to respectively measure the resistance of the slurry structureNAnd a structure other than the solid of the bituminous mixtureMBy the formula
Calculating the resistance ratioD 2 As shown in fig. 6, the grouting effect of the poured asphalt concrete was comprehensively evaluated by the grouting saturation and the resistivity ratio.
In the invention, the CT tomography in the step one adopts scanning voltage and current of 200KV and 0.56mA, and the tomography is to integrally scan the Marshall test piece from top to bottom based on a sector scanning mode; the establishment of the three-dimensional structure involves the determination of a grayscale image threshold by: setting a plurality of threshold values, respectively establishing a three-dimensional structure under each threshold value, calculating the void ratio of each structure, and taking the threshold value of the structure as the threshold value when the true void ratio of the test piece is equivalent.
The three-dimensional structure reconstruction in the invention is carried out by leading the CT scanning image into a Materialized Interactive Medical Image Control System (MIMICS), and the leading-in method can be seen in a published paper:
10.1080/10298436.2018.1555330, chemical distribution of three-dimensional connected potentials in pore space texture and flow mapping of property and identity, DOI; chen Jun, et al, Expansion and transformation of cloned open graded circulation to freeze-thaw cycles and grading of mechanical performance, Construction and Building Materials, 2018, 182: 167-. And will not be described in detail herein.
The identification method of the communication gap comprises the following steps: the cubic three-dimensional network of voids is divided into a number of unconnected portions, with the larger portion throughout the length of the cube being connected voids and the other smaller portions of the mixture being closed voids. FIG. 4 is a graph showing the separation of open porosity and closed porosity in the total porosity of a 6cm cubic area on a side of a Marshall specimen.
In the second step, in the three-dimensional reconstruction process, the space is subjected to surface mesh division by using the automatically generated triangles, and the volumes of the slurry and the communicated gaps are calculated by using the volume enclosed by the triangular curved surface meshes, as shown in fig. 5.
The three-dimensional model data in the third step must be converted into an STL format before being imported into the 3D printer; the material used for 3D printing is a material with good conductivity, and metal powder is preferred.
And step four, measuring the resistance value of the cubic model in three dimensional directions by using a two-electrode method, taking the average value of the three dimensions as the resistance value of the structure, wherein the two-electrode method comprises the following operation steps: two copper sheet electrodes 2 are respectively attached to the bottom surface of a test piece 1 (a slurry structure or a structure excluding asphalt mixture solids), a universal meter 3 is used for measuring the voltage value between the two copper sheet electrodes 2, and the resistance R is calculated by using ohm's law R = U/I, as shown in FIG. 6. Specifically, in the fourth step, the resistance value of the paste structure is measured in the normal direction of three mutually perpendicular surfaces by the two-electrode method, and the average value of the resistances in the three directions is taken as the resistance value of the structureN. Measuring the resistance value of the structure except the solid of the asphalt mixture in three directions by a two-electrode method, and taking the average value of the resistances in the normal directions of three surfaces of the slurry structure which are perpendicular to each other as the resistance value of the structureM。
The above embodiments do not limit the present invention in any way, and all technical solutions obtained by means of equivalent substitution or equivalent transformation fall within the scope of the present invention.
Claims (9)
1. The evaluation method of the grouting effect of the poured asphalt concrete is characterized by comprising the following steps:
step one, carrying out CT (computed tomography) tomography scanning on a grouted porous asphalt mixture Marshall test piece to obtain a two-dimensional tomography picture, and respectively establishing a three-dimensional structure of a communicated gap and grouted slurry inside the mixture Marshall test piece;
step two, taking a cubic range in the three-dimensional structure obtained in the step one as an object, calculating the volume of a communicated gap and the volume of slurry in the range, and calculating grouting fullness according to the volume of the communicated gap and the volume of the slurry;
thirdly, adopting a conductive material to print a slurry structure in the cubic range and a structure except the asphalt mixture solid in a 3D mode, wherein the structure except the asphalt mixture solid comprises communicated gaps and slurry;
respectively measuring the resistances of the printed slurry structure and the structure except the solid of the asphalt mixture, calculating a resistance ratio, and comprehensively evaluating the grouting effect of the poured asphalt concrete according to the grouting saturation and the resistance ratio;
in the second step, the grouting fullnessD 1 The calculation formula of (2) is as follows:
wherein the content of the first and second substances, V 1 in order to communicate the volume of the void,V 2 is the volume of the slurry.
2. The method for evaluating the grouting effect of the poured asphalt concrete according to claim 1, wherein in the second step, a cubic range of 60mm x 60mm is taken as an object in the three-dimensional structure obtained in the first step, and the connected void volume and the slurry volume in the range are calculated.
3. The method for evaluating the grouting effect of the poured asphalt concrete according to claim 1, wherein in the second step, in the three-dimensional reconstruction process, the structure surface is divided by the generated triangle, and the volume of the slurry and the volume of the communicated gap are obtained by using the volume enclosed by the triangular curved surface mesh.
4. The method for evaluating the grouting effect of the poured asphalt concrete according to claim 1, wherein the identification method of the connected gap is as follows: the cubic three-dimensional network of voids is divided into a number of unconnected portions, with the larger portion throughout the length of the cube being connected voids and the other smaller portions of the mixture being closed voids.
5. The method for evaluating grouting effect of the filled asphalt concrete according to claim 1, wherein in the third step, a slurry structure in the range of 60mm x 60mm and a structure except the asphalt mixture solid are 3D printed.
6. The method for evaluating the grouting effect of the poured asphalt concrete according to claim 1, wherein in the fourth step, the calculation method of the resistance ratio comprises the following steps: the resistance of the printed slurry structure and the resistance of the structure excluding the solid asphalt mixture were measured, respectively, and the resistance ratio was obtained from the following formulaD 2 ：
Wherein the content of the first and second substances,Nin order to obtain a resistance of the resulting slurry structure,Mis the resistance of the structure except the solid of the asphalt mixture.
7. The method for evaluating the grouting effect of the poured asphalt concrete according to claim 1, wherein in the first step, the establishment of the three-dimensional structure involves the determination of a gray level image threshold value, and the threshold value is determined by the following method: setting a plurality of threshold values, respectively establishing a three-dimensional structure under each threshold value, calculating the void ratio of each structure, and taking the threshold value of the structure as the threshold value when the true void ratio of the test piece is equivalent.
8. The method for evaluating the grouting effect of the poured asphalt concrete according to claim 1, wherein in the third step, the material adopted by the 3D printing is metal powder.
9. The method for evaluating grouting effect of the poured asphalt concrete according to claim 1, wherein in the first step, CT tomography adopts 200KV voltage and 0.56mA current.
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| CN111925156A (en) * | 2020-08-05 | 2020-11-13 | 长安大学 | Pouring type phase change energy storage asphalt concrete pavement material and preparation method thereof |
| CN113655209A (en) * | 2021-08-13 | 2021-11-16 | 同济大学 | Method for determining grouting saturation of cement mortar of semi-flexible pavement |
| CN117571698B (en) * | 2024-01-15 | 2024-03-22 | 中交一公局西南工程有限公司 | Filling type saturation detection method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105801058A (en) * | 2016-06-03 | 2016-07-27 | 江苏东交工程设计顾问有限公司 | Durable rapid repair material for pavement around inspection well and preparation and detection method of durable rapid repair material for pavement around inspection well |
| CN106053168A (en) * | 2016-05-20 | 2016-10-26 | 长安大学 | Concrete microscopic three-phase structure visualization method based on 3D printing technology |
| CN106182330A (en) * | 2016-06-27 | 2016-12-07 | 长安大学 | A kind of hypostazation method of the concrete pore structural model printed based on 3D |
| KR101815513B1 (en) * | 2016-07-11 | 2018-01-30 | 서울시립대학교 산학협력단 | Polymer Cement Concrete 3D Printer And Concrete Structures Manufacturing Method Using Thereof |
| CN107991348A (en) * | 2017-12-29 | 2018-05-04 | 中冶建筑研究总院有限公司 | A kind of grouting material plumpness detection method and device |
| CN109959683A (en) * | 2019-04-18 | 2019-07-02 | 南通大学 | A kind of detection method of sleeve Grouted density quality |
| CN110174324A (en) * | 2019-05-30 | 2019-08-27 | 河海大学 | The solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation test device and method |
| CN209387658U (en) * | 2018-12-28 | 2019-09-13 | 杨春白雪 | A kind of band fractures the sleeve grouting plumpness observer of structure |
| CN110285867A (en) * | 2019-07-29 | 2019-09-27 | 北京中建建筑科学研究院有限公司 | Prefabricated concrete structure reinforced bar sleeve grouting plumpness monitoring device and method |
-
2019
- 2019-09-29 CN CN201910930037.7A patent/CN110672647B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053168A (en) * | 2016-05-20 | 2016-10-26 | 长安大学 | Concrete microscopic three-phase structure visualization method based on 3D printing technology |
| CN105801058A (en) * | 2016-06-03 | 2016-07-27 | 江苏东交工程设计顾问有限公司 | Durable rapid repair material for pavement around inspection well and preparation and detection method of durable rapid repair material for pavement around inspection well |
| CN106182330A (en) * | 2016-06-27 | 2016-12-07 | 长安大学 | A kind of hypostazation method of the concrete pore structural model printed based on 3D |
| KR101815513B1 (en) * | 2016-07-11 | 2018-01-30 | 서울시립대학교 산학협력단 | Polymer Cement Concrete 3D Printer And Concrete Structures Manufacturing Method Using Thereof |
| CN107991348A (en) * | 2017-12-29 | 2018-05-04 | 中冶建筑研究总院有限公司 | A kind of grouting material plumpness detection method and device |
| CN209387658U (en) * | 2018-12-28 | 2019-09-13 | 杨春白雪 | A kind of band fractures the sleeve grouting plumpness observer of structure |
| CN109959683A (en) * | 2019-04-18 | 2019-07-02 | 南通大学 | A kind of detection method of sleeve Grouted density quality |
| CN110174324A (en) * | 2019-05-30 | 2019-08-27 | 河海大学 | The solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation test device and method |
| CN110285867A (en) * | 2019-07-29 | 2019-09-27 | 北京中建建筑科学研究院有限公司 | Prefabricated concrete structure reinforced bar sleeve grouting plumpness monitoring device and method |
Non-Patent Citations (3)
| Title |
|---|
| "Numerical study on seepage flow in pervious concrete based on 3D CT imaging";Jiong Zhang 等;《Construction and Building Materials》;20180210;全文 * |
| "Performance verification of various bulk density measurement methods for open- and gap-graded asphalt mixtures using X-ray computed tomography";Zhang, Yuan 等;《CONSTRUCTION AND BUILDING MATERIALS》;20180615;全文 * |
| "多孔沥青混合料渗水性能的方向差异性及其受孔隙结构的影响";陈俊 等;《东南大学学报》;20180930;全文 * |
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