CN108663284B - Rapid evaluation method for compaction uniformity of asphalt mixture - Google Patents
Rapid evaluation method for compaction uniformity of asphalt mixture Download PDFInfo
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- CN108663284B CN108663284B CN201810664768.7A CN201810664768A CN108663284B CN 108663284 B CN108663284 B CN 108663284B CN 201810664768 A CN201810664768 A CN 201810664768A CN 108663284 B CN108663284 B CN 108663284B
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- 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
- G01N5/045—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 for determining moisture content
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Abstract
The invention discloses a method for quickly evaluating compaction uniformity of an asphalt mixture, belongs to the field of quality detection and evaluation of the asphalt mixture, and particularly relates to a method for quickly evaluating the compaction uniformity of the asphalt mixture. The invention aims to solve the problems that the existing evaluation method is expensive in equipment price and needs to have a more advanced image analysis means. The method comprises the following steps: the asphalt mixture test piece is molded through compaction equipment, the molded test piece is soaked in water to be in a sufficient water saturation state, the test piece is wrapped by a film to prevent the migration and the loss of water, and the water saturation test piece wrapped by the film is placed in a low temperature to be frozen and then taken out. And equally cutting the asphalt mixture. Weighing each mixture sample, then placing each mixture sample in an oven to dry until the sample is constant weight, weighing the constant weight mass of each asphalt mixture sample again, respectively calculating the water content coefficient of each sample, and evaluating the compaction uniformity of the asphalt mixture by calculating the discreteness of N water content coefficients.
Description
Technical Field
The invention belongs to the field of quality detection and evaluation of asphalt mixtures, and particularly relates to a rapid evaluation method for compaction uniformity of an asphalt mixture.
Background
Asphalt mixes are very complex heterogeneous composites. In the road construction process, the compaction degree of the asphalt mixture is an important link of engineering quality control, and in fact, research shows that the compaction uniformity of the asphalt also has important influence on the service life of an asphalt pavement. The establishment of a reasonable and rapid evaluation method for the compaction degree and uniformity of the asphalt mixture has important significance for road surface quality control.
At present, a CT image processing method is generally adopted in the uniformity evaluation method of the asphalt mixture, and the porosity distribution in an image is identified to evaluate the uniformity of the asphalt mixture. However, evaluation methods based on CT images require the presence of a corresponding CT scanner. The equipment is expensive and needs to have a more advanced image analysis means, and the technical problems prevent the popularization of evaluating the uniformity of the asphalt mixture based on the CT image to a certain extent.
Therefore, the method for quickly and effectively judging the uniformity of the asphalt mixture has important significance for controlling the engineering quality of the asphalt mixture.
Disclosure of Invention
The invention provides a rapid evaluation method for compaction uniformity of an asphalt mixture, aiming at solving the problems that the existing evaluation method is expensive in equipment price and needs to have a more advanced image analysis means.
A method for quickly evaluating the compaction uniformity of an asphalt mixture is carried out according to the following steps:
firstly, according to construction requirements, selecting asphalt and aggregate to mix according to a mixing ratio design, and then compacting a mixture to obtain an asphalt mixture test piece;
secondly, immersing the asphalt mixture test piece into water, wrapping the asphalt mixture by using a film after the asphalt mixture test piece reaches a water saturation state, taking out, and then transferring to a low-temperature environment for freezing to obtain a frozen asphalt mixture;
equally cutting the frozen asphalt mixture into N small blocks to obtain N asphalt mixtures, respectively weighing the mass of each single asphalt mixture, then putting the asphalt mixtures into an oven to a constant weight state, and recording the mass of each single asphalt mixture in the constant weight state; and calculating the water content coefficient of each single asphalt mixture according to the mass before and after drying, calculating the discreteness of the N water content coefficients, and evaluating the compaction uniformity of the asphalt mixture.
The invention has the beneficial effects that:
the invention does not need to adopt a high-precision instrument such as CT to carry out image scanning on the asphalt mixture so as to judge the compaction uniformity of the mixture, and provides a quick and effective compaction uniformity judging method. The invention ensures the uniformity of the porosity connectivity to a certain extent, and can quickly prejudge the forming quality when researching the porous asphalt mixture.
Drawings
FIG. 1 is a flow chart of the evaluation method of the present invention;
FIG. 2 is a schematic view of the cutting mode of the asphalt mixture.
Detailed Description
The first embodiment is as follows: the rapid evaluation method for the compaction uniformity of the asphalt mixture is implemented according to the following steps:
firstly, according to construction requirements, selecting asphalt and aggregate to mix according to a mixing ratio design, and then compacting a mixture to obtain an asphalt mixture test piece;
secondly, immersing the asphalt mixture test piece into water, wrapping the asphalt mixture by using a film after the asphalt mixture test piece reaches a water saturation state, taking out, and then transferring to a low-temperature environment for freezing to obtain a frozen asphalt mixture;
equally cutting the frozen asphalt mixture into N small blocks to obtain N asphalt mixtures, respectively weighing the mass of each single asphalt mixture, then putting the asphalt mixtures into an oven to a constant weight state, and recording the mass of each single asphalt mixture in the constant weight state; and calculating the water content coefficient of each single asphalt mixture according to the mass before and after drying, calculating the discreteness of the N water content coefficients, and evaluating the compaction uniformity of the asphalt mixture.
The higher the degree of dispersion the worse the uniformity.
The film used in step two of this embodiment has good sealability and light weight.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: in the step one, the compaction is a Marshall compaction method, a rotary compaction method or a shearing compaction method. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: in the second step, the low-temperature environment is-10 ℃. The others are the same as in the first or second embodiment.
The low-temperature cracking and other damage phenomena of the mixture can not occur in the freezing process of the asphalt mixture in the embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: and in the third step, the equally dividing and cutting is to transversely equally divide and cut the frozen asphalt mixture. The rest is the same as one of the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: and in the third step, the minimum size of each small block is more than or equal to the designed maximum nominal grain diameter of the asphalt mixture test piece. The rest is the same as one of the first to fourth embodiments.
And the N value in the third step can be automatically adjusted according to the evaluation precision.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: the temperature of the oven in the third step is controlled below 100 ℃. The rest is the same as one of the first to fifth embodiments.
The embodiment can prevent the asphalt mixture from being in a loose state.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the calculation method of the water content coefficient of each small block in the third step comprises the following steps:
wherein: wiIs a water content coefficient, MiMass of each piece, m, before placing in the oveniThe mass of each nub is a constant weight condition. The rest is the same as one of the first to sixth embodiments.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: the method for calculating the discreteness of the N water-containing coefficients in the third step comprises the following steps:
The following examples were used to demonstrate the beneficial effects of the present invention:
example (b): a method for rapidly evaluating compaction uniformity of an asphalt mixture comprises the following steps:
step one, mixing asphalt and aggregate according to the AC13 mixing ratio, and compacting and molding the asphalt mixture by adopting a rotary compactor to obtain an asphalt mixture test piece with the diameter of 15cm and the height of 11 cm.
Immersing the asphalt mixture test piece into water, wrapping the asphalt mixture by using a preservative film for daily use before taking out the test piece after the test piece reaches a water saturation state, and then freezing the test piece in a low-temperature refrigerator at 5 ℃ for four hours;
step three, as shown in fig. 2, equally cutting the mixture into 5 parts by using a cutting machine;
weighing the mass of each block of asphalt mixture, and then putting the blocks into an oven to a constant weight state;
step five, calculating the water content coefficient of each asphalt mixture, and then calculating 5 water content coefficient discreteness to evaluate the compaction uniformity of the asphalt mixture;
the parameters measured and calculated in this example are as follows:
the invention does not need to adopt a high-precision instrument such as CT to carry out image scanning on the asphalt mixture so as to judge the compaction uniformity of the mixture, and provides a quick and effective compaction uniformity judging method. The invention ensures the uniformity of the porosity connectivity to a certain extent, and can quickly prejudge the forming quality when researching the porous asphalt mixture.
Claims (6)
1. A rapid evaluation method for the compaction uniformity of an asphalt mixture is characterized by comprising the following steps:
firstly, according to construction requirements, selecting asphalt and aggregate to mix according to a mixing ratio design, and then compacting a mixture to obtain an asphalt mixture test piece;
secondly, immersing the asphalt mixture test piece into water, wrapping the asphalt mixture by using a film after the asphalt mixture test piece reaches a water saturation state, taking out, and then transferring to a low-temperature environment for freezing to obtain a frozen asphalt mixture;
equally cutting the frozen asphalt mixture into N small blocks to obtain N asphalt mixtures, respectively weighing the mass of each single asphalt mixture, then putting the asphalt mixtures into an oven to a constant weight state, and recording the mass of each single asphalt mixture in the constant weight state; calculating the water content coefficient of each single asphalt mixture according to the mass before and after drying, calculating the discreteness of N water content coefficients, and evaluating the compaction uniformity of the asphalt mixture;
the calculation method of the water content coefficient of each small block comprises the following steps:
wherein: wiIs a water content coefficient, MiMass of each piece, m, before placing in the oveniThe mass of each nub is in a constant weight state;
the method for calculating the discreteness of the N water-containing coefficients comprises the following steps:
2. The method for rapidly evaluating the compaction uniformity of the asphalt mixture according to claim 1, wherein the compaction in the first step is a Marshall compaction method, a rotary compaction method or a shear compaction method.
3. The method for rapidly evaluating the compaction uniformity of the asphalt mixture according to claim 1, wherein the low temperature environment in the second step is-10 ℃.
4. The method for rapidly evaluating the compaction uniformity of the asphalt mixture according to claim 2, wherein the equally dividing in the third step is to perform transversely equally dividing on the frozen asphalt mixture.
5. The method for rapidly evaluating the compaction uniformity of the bituminous mixture according to claim 4, wherein the minimum size of each small block in the third step is greater than or equal to the designed maximum nominal particle size of the bituminous mixture test piece.
6. The method for rapidly evaluating the compaction uniformity of the asphalt mixture according to claim 4, wherein the temperature of the oven in the third step is controlled below 100 ℃.
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| CN102507382B (en) * | 2011-11-22 | 2013-08-14 | 武汉理工大学 | Testing method for evaluating working performance of self-compacting concrete |
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| CN105806861A (en) * | 2016-04-25 | 2016-07-27 | 浙江大学 | Visual uniaxial penetrating test-based bituminous mixture homogeneity evaluation method |
| CN107036933B (en) * | 2017-04-20 | 2020-01-14 | 阜阳师范学院 | Fine detection and evaluation method for compaction uniformity of asphalt pavement |
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