CN114486609A - Detection method for segregation degree of asphalt mixture - Google Patents
Detection method for segregation degree of asphalt mixture Download PDFInfo
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- CN114486609A CN114486609A CN202111576309.1A CN202111576309A CN114486609A CN 114486609 A CN114486609 A CN 114486609A CN 202111576309 A CN202111576309 A CN 202111576309A CN 114486609 A CN114486609 A CN 114486609A
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- 239000000203 mixture Substances 0.000 title claims abstract description 92
- 239000010426 asphalt Substances 0.000 title claims abstract description 91
- 238000005204 segregation Methods 0.000 title claims abstract description 54
- 238000001514 detection method Methods 0.000 title claims description 8
- 239000002245 particle Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000002791 soaking Methods 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract description 7
- 239000003960 organic solvent Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000012216 screening Methods 0.000 claims abstract description 3
- 239000000945 filler Substances 0.000 claims description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 8
- 239000011707 mineral Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims description 4
- 239000003350 kerosene Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 9
- 239000011384 asphalt concrete Substances 0.000 abstract description 8
- 238000010998 test method Methods 0.000 abstract description 3
- 238000011002 quantification Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 239000004575 stone Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000012615 aggregate Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
-
- 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
- G01N1/40—Concentrating samples
- G01N1/4055—Concentrating samples by solubility techniques
-
- 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
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Road Paving Structures (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention provides a method for detecting the segregation degree of an asphalt mixture, which comprises the following steps: sorting aggregate particles with the particle size of more than or equal to 4.75mm from a sample; soaking the aggregate particles by using an organic solvent, and stirring until the asphalt in the aggregate particles is completely dissolved; then extracting, drying and weighing, and recording the weight as m 1; screening and drying the weighed aggregate particles to obtain aggregate particles with the particle size larger than 2.36mm, weighing and recording as mass m 2; the resolution L, L ═ ((m1-m2)/m1) × 100 was calculated. The invention provides a test method from the perspective of testing the segregation degree quantification of the asphalt mixture, and provides a test basis for controlling the segregation of the asphalt mixture, so that the working performance of the asphalt mixture is improved, and the quality of an asphalt concrete finished product is further ensured.
Description
Technical Field
The invention relates to the technical field of highway engineering materials, in particular to a method for detecting the segregation degree of an asphalt mixture.
Background
The asphalt mixture is a widely used pavement material, the pavement performance of the asphalt concrete is closely related to the working performance (construction workability) of the asphalt mixture, the asphalt mixture is composed of coarse and fine aggregates, fillers, asphalt cement and the like, before the asphalt concrete is not formed, the hot-mixed asphalt mixture is in a loose state with certain cohesiveness after being mixed, due to the characteristics of the composition of the asphalt mixture, if the design and the composition of the mixing proportion are improper or the construction control in the construction process is improper, the problems of thickness segregation, temperature segregation and the like of the mixture can occur, these segregation will cause the uniformity of the formed asphalt concrete pavement structure to have larger deviation, the deformation resistance, rutting resistance, water damage resistance and fatigue resistance of the asphalt concrete will be affected, and the damage to the asphalt concrete pavement structure will be aggravated with the increase of the segregation degree of the asphalt mixture.
The control of the working performance of the asphalt mixture in a good state is a common problem faced by vast asphalt pavement technicians, but a quantitative test method is lacked for testing the working performance-segregation degree of the asphalt mixture.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for detecting the segregation degree of an asphalt mixture, which provides a test basis for controlling the segregation of the asphalt mixture, thereby improving the working performance of the asphalt mixture and further ensuring the quality of the finished asphalt concrete product.
In order to achieve the purpose, the invention provides a method for detecting the segregation degree of an asphalt mixture.
The method for detecting the segregation degree of the asphalt mixture comprises the following steps:
sorting aggregate particles with the particle size of more than or equal to 4.75mm from a sample;
soaking the aggregate particles by using an organic solvent, and stirring until the asphalt in the aggregate particles is completely dissolved; then extracting, drying and weighing, and recording the weight as m 1;
screening and drying the weighed aggregate particles to obtain aggregate particles with the particle size larger than 2.36mm, weighing and recording as mass m 2;
the resolution L, L ═ ((m1-m2)/m1) × 100 was calculated.
Further, sampling the asphalt mixture according to a quartering method to obtain a sample; wherein the asphalt mixture is a fine-grain type, medium-grain type or coarse-grain type mixture.
Further, the asphalt mixture is a fine-grain mixture, and is prepared by mixing coarse aggregates, fine aggregates, mineral powder filler and asphalt at 130-170 ℃ and then cooling to room temperature.
Further, the coarse aggregate is formed by combining a first-particle-size coarse aggregate, a second-particle-size coarse aggregate and a third-particle-size coarse aggregate;
wherein the particle sizes of the first-particle-size coarse aggregate, the second-particle-size coarse aggregate and the third-particle-size coarse aggregate are 10-15 mm, 6-10 mm and 3-6 mm in sequence.
Further, in the asphalt mixture, the mass percentages of the first-particle-size coarse aggregate, the second-particle-size coarse aggregate and the third-particle-size coarse aggregate are 15-25%, 17-30% and 13-25% in sequence.
Further, the particle size of the fine aggregate is less than 2.36mm, and the mass percentage of the fine aggregate in the asphalt mixture is 26-36%.
Further, the mass percentage of the mineral powder filler in the asphalt mixture is 2-6%, and the mass percentage of the asphalt is 3.84-5.66%.
Furthermore, the mass of the sample is 1000-1500 g.
Further, the organic solvent is trichloroethylene solution or kerosene, and the soaking time is more than or equal to 30 min.
Further, the drying temperature is 105 +/-5 ℃, and the time is 3-5 hours.
The invention provides a test method from the perspective of testing the segregation degree quantification of the asphalt mixture, and provides a test basis for controlling the segregation of the asphalt mixture, so that the working performance of the asphalt mixture is improved, and the quality of an asphalt concrete finished product is further ensured.
The detection method is simple and quick, and can indirectly judge whether the oilstone ratio of the asphalt mixture is in the optimal value range by detecting the segregation degree, thereby providing guidance for the practical application of the asphalt mixture.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart of a method for detecting segregation degree of asphalt mixture according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The invention designs a quantitative method for testing the segregation degree of the asphalt mixture by utilizing the adhesiveness of the asphalt cementing material at high temperature (130-170 ℃), the thickness of an oil film coated on the surfaces of broken stones and fillers by the cementing material in the mixture and other conditions.
As shown in fig. 1, the method for detecting the segregation degree of the asphalt mixture comprises the following steps:
sampling the asphalt mixture according to a quartering method to obtain a sample; wherein the mass of the sample is within the range of 1000-1500 g.
The asphalt mixture may be a fine-grained, medium-grained or coarse-grained mixture, the fine-grained mixture may be, for example, an AC-10, AC-13 asphalt mixture; the medium particle mixture can be, for example, AC-16, AC-20 asphalt; the coarse mix may be, for example, an AC-25 or AC-30 asphalt mix. When a fine-grained blend is used, the mass of the sample may be 1000 g; when a medium grain mix is used, the mass of the sample may be 1200 g; when a coarse-grained blend is used, the mass of the sample may be 1500 g.
In the embodiment of the invention, the AC-13 fine grain type mixture is adopted, and specifically, the AC-13 fine grain type mixture is prepared by mixing coarse aggregates, fine aggregates, mineral powder filler and asphalt at 130-170 ℃ and then cooling to room temperature.
Wherein, the coarse aggregate is formed by combining the coarse aggregate with the first particle size, the coarse aggregate with the second particle size and the coarse aggregate with the third particle size.
The particle sizes of the first-particle-size coarse aggregate, the second-particle-size coarse aggregate and the third-particle-size coarse aggregate are 10-15 mm, 6-10 mm and 3-6 mm in sequence.
The mass percentages of the first-particle-size coarse aggregate, the second-particle-size coarse aggregate and the third-particle-size coarse aggregate are 15-25%, 17-30% and 13-25% in sequence.
The particle size of the fine aggregate is less than 2.36mm, and the mass percentage of the fine aggregate is 26-36%.
The mass percentage of the mineral powder filler is 2-6%.
The mass percentage of the asphalt is 3.84-5.66%.
Sorting aggregate particles with the particle size of more than or equal to 4.75mm from a sample; note that during sorting, the action is gentle, and the fine aggregate adhered to the aggregate particles is prevented from falling off.
Soaking coarse aggregate particles in trichloroethylene solution or kerosene for more than or equal to 30min, and properly stirring the mixture by a glass rod until asphalt is completely dissolved, wherein no asphalt on the aggregate surface is taken as a standard.
And extracting the aggregate, drying at 105 +/-5 ℃ for 3-5 hours, weighing, and recording as mass m 1.
The weighed aggregate particles were screened and dried to give aggregate particles with a particle size > 2.36mm and weighed and reported as mass m 2.
The resolution L, L ═ ((m1-m2)/m1) × 100 was calculated.
Generally, the larger the segregation degree L value is, the better the segregation resistance of the asphalt mixture is.
But the segregation degree L has an upper limit value, the maximum asphalt consumption of the mixture is firstly measured according to the maximum asphalt consumption testing method of the asphalt mixture, then the asphalt mixture is obtained by mixing the maximum asphalt consumption, and finally the segregation degree L measured by the method is the upper limit value.
The optimal oilstone ratio of the asphalt mixture corresponds to the optimal segregation degree, and whether the oilstone ratio of the asphalt mixture is in the optimal range value can be indirectly judged by detecting the segregation degree of the asphalt mixture. And for a certain kind of asphalt mixture, the optimal oilstone ratio is determined according to a mix proportion design method, and in the fluctuation range (plus or minus 0.3%) of the optimal oilstone ratio, the corresponding segregation degree L is the optimal range value of the asphalt mixture.
The method for detecting the segregation degree of the asphalt mixture according to the present invention will be described in detail with reference to specific examples.
Example 1:
1. taking the stirred fine-grain asphalt mixture meeting the blending temperature (130-170 ℃), sampling by a quartering method, taking two samples from opposite angles, and taking the sample with the mass of 1000 g.
2. Putting the sample into a clean stainless steel square plate, slightly spreading the mixture by using a material shovel to form a thin layer with separated and non-overlapped aggregate phases, and cooling to room temperature.
3. From the cooled sample, aggregate particles having a particle size of 4.75mm or more were sorted out.
4. Placing the sorted aggregate particles into a glass beaker, soaking the glass beaker with trichloroethylene for 30min, stirring the glass beaker by a glass rod to dissolve asphalt, and separating fine aggregates from the surface of aggregate; then, the mixture was extracted, dried at 105 ℃ for 3 hours, and weighed, and the mass was recorded as m 1.
5. The dried and weighed mixture was sieved through a 2.36mm square mesh sieve, and the remaining crushed stones on the sieve were weighed to obtain a mass m 2.
6. To ensure accuracy, the above test was performed in parallel twice, the segregation degree was calculated and noted as L, the calculation formula L ═(m1-m2)/m1) × 100, and the results of the two calculations could not exceed 3% of the average value.
In the invention, the segregation degree L represents the proportion of asphalt adhered to coarse aggregate, fine aggregate below 2.36mm and mineral powder filler in the total mass of the asphalt mixture.
Examples 2 to 3 adopt the same test method as example 1, except that the mass percentages of the coarse aggregate, the fine aggregate, the mineral powder filler and the asphalt in the asphalt mixture, the oil-stone ratio and the process parameters in the respective steps are different. The parameters of the steps of the detection methods of examples 1-3 are summarized and shown in tables 1-2.
TABLE 1 summary of the respective constituent materials of asphalt mixtures of examples 1 to 3
TABLE 2 summary of the Process parameters in the detection methods of examples 1-3
Meanwhile, the segregation degree L is calculated according to the detection method in the embodiments 1 to 3, the oilstone ratio in the embodiments 1 to 3 is calculated by adopting an industry conventional calculation method, and the result is detailed in a table 3.
TABLE 3 results of the oilstone ratio and the resolution in examples 1 to 3
| Group of | Oil-to-stone ratio (%) | Degree of segregation L |
| Example 1 | 4.0 | 15.8 |
| Example 2 | 5.3 | 32.3 |
| Example 3 | 5.6 | 34 |
As can be seen from Table 3, the segregation L is obtained by the detection method of the present invention, and whether the oilstone ratio of the asphalt mixture is within the optimum value range is indirectly judged by the segregation L. If it is found by inspection that the oilstone ratio of 5.3% in example 2 is the optimum value and the corresponding segregation degree L32.3 is the optimum segregation value, the range value (27-34) of the segregation degree L corresponding to the range of oilstone ratio of 5.0-5.6% is further obtained as the preferred segregation value (including the preferred range value of 32.4, corresponding to the oilstone ratio of 5.0-5.6%).
It is also not difficult to see by combining example 1 and example 3, the oilstone ratio in example 1 is 4.0%, and the segregation degree L15.2 is detected to be lower than the preferable segregation degree range value, which indicates that the segregation degree L value is lower and the asphalt content is lower; the oilstone ratio in example 3 was 5.6%, and the segregation degree L34 was measured as the upper limit of the segregation degree range, and a value greater than this would result in a higher asphalt content in the mix.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A detection method for the segregation degree of an asphalt mixture is characterized by comprising the following steps:
sorting aggregate particles with the particle size of more than or equal to 4.75mm from a sample;
soaking the aggregate particles by using an organic solvent, and stirring until the asphalt in the aggregate particles is completely dissolved; then extracting, drying and weighing, and recording as mass m 1;
screening and drying the weighed aggregate particles to obtain aggregate particles with the particle size larger than 2.36mm, weighing and recording as mass m 2;
the resolution L, L ═ ((m1-m2)/m1) × 100 was calculated.
2. The method for detecting the segregation degree of the asphalt mixture according to claim 1, wherein the sample is obtained by sampling the asphalt mixture by a quartering method; wherein the asphalt mixture is a fine-grain type, medium-grain type or coarse-grain type mixture.
3. The method for detecting the segregation degree of the asphalt mixture according to claim 1 or 2, wherein the asphalt mixture is a fine-grained mixture, and is prepared by mixing coarse aggregates, fine aggregates, mineral powder filler and asphalt at 130-170 ℃ and then cooling to room temperature.
4. The method for detecting the segregation degree of the asphalt mixture according to claim 3, wherein the coarse aggregate is formed by combining a first-particle-size coarse aggregate, a second-particle-size coarse aggregate and a third-particle-size coarse aggregate;
wherein the particle sizes of the first-particle-size coarse aggregate, the second-particle-size coarse aggregate and the third-particle-size coarse aggregate are 10-15 mm, 6-10 mm and 3-6 mm in sequence.
5. The method for detecting the segregation degree of the asphalt mixture according to claim 4, wherein the mass percentages of the first-particle-size coarse aggregate, the second-particle-size coarse aggregate and the third-particle-size coarse aggregate in the asphalt mixture are 15-25%, 17-30% and 13-25% in sequence.
6. The method for detecting the segregation degree of the asphalt mixture according to claim 3, wherein the particle size of the fine aggregate is less than 2.36mm, and the mass percentage of the fine aggregate in the asphalt mixture is 26-36%.
7. The method for detecting the segregation degree of the asphalt mixture according to claim 3, wherein the mass percentage of the mineral powder filler in the asphalt mixture is 2-6%, and the mass percentage of the asphalt is 3.84-5.66%.
8. The method for detecting the segregation degree of the asphalt mixture according to claim 1, wherein the mass of the sample is 1000-1500 g.
9. The method for detecting the segregation degree of the asphalt mixture according to claim 1, wherein the organic solvent is trichloroethylene solution or kerosene, and the soaking time is not less than 30 min.
10. The method for detecting the segregation degree of the asphalt mixture according to claim 1, wherein the drying temperature is 105 +/-5 ℃ and the drying time is 3-5 hours.
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| CN202111576309.1A CN114486609B (en) | 2021-12-21 | 2021-12-21 | Method for detecting segregation degree of asphalt mixture |
| PCT/CN2022/096258 WO2023115827A1 (en) | 2021-12-21 | 2022-05-31 | Method for detecting segregation degree of asphalt mixture |
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| CN202111576309.1A CN114486609B (en) | 2021-12-21 | 2021-12-21 | Method for detecting segregation degree of asphalt mixture |
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| WO2023115827A1 (en) * | 2021-12-21 | 2023-06-29 | 中交一公局集团有限公司 | Method for detecting segregation degree of asphalt mixture |
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| CN117218126B (en) * | 2023-11-09 | 2024-02-13 | 安徽省交通规划设计研究总院股份有限公司 | Asphalt mixture uniformity calculation method in image processing vision field |
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- 2021-12-21 CN CN202111576309.1A patent/CN114486609B/en active Active
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023115827A1 (en) * | 2021-12-21 | 2023-06-29 | 中交一公局集团有限公司 | Method for detecting segregation degree of asphalt mixture |
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| CN114486609B (en) | 2024-02-09 |
| WO2023115827A1 (en) | 2023-06-29 |
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