CN110609008A - Rapid assessment method for RAP (rapid asphalt ratio) mixing amount in recycled asphalt mixture based on infrared spectrum - Google Patents
Rapid assessment method for RAP (rapid asphalt ratio) mixing amount in recycled asphalt mixture based on infrared spectrum Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 133
- 239000000203 mixture Substances 0.000 title claims abstract description 110
- 238000002156 mixing Methods 0.000 title claims abstract description 70
- 238000002329 infrared spectrum Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 43
- 238000011156 evaluation Methods 0.000 claims abstract description 36
- 238000013210 evaluation model Methods 0.000 claims abstract description 34
- 239000000725 suspension Substances 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 claims abstract description 13
- 238000010276 construction Methods 0.000 claims abstract description 13
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 13
- 239000010432 diamond Substances 0.000 claims abstract description 13
- 238000004566 IR spectroscopy Methods 0.000 claims abstract description 11
- 239000013078 crystal Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000010521 absorption reaction Methods 0.000 claims description 26
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 24
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 18
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 16
- 238000001228 spectrum Methods 0.000 claims description 16
- 238000005102 attenuated total reflection Methods 0.000 claims description 12
- 150000003462 sulfoxides Chemical class 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 6
- 238000012417 linear regression Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 6
- 239000003960 organic solvent Substances 0.000 claims description 6
- 238000004898 kneading Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 125000003375 sulfoxide group Chemical group 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000003908 quality control method Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 9
- 230000008929 regeneration Effects 0.000 description 7
- 238000011069 regeneration method Methods 0.000 description 7
- 238000011160 research Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 240000002791 Brassica napus Species 0.000 description 1
- 229920000715 Mucilage Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 125000000524 functional group Chemical group 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000012844 infrared spectroscopy analysis Methods 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
- 239000000843 powder Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000012492 regenerant Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012795 verification Methods 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
- 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
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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
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N2021/3595—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using FTIR
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
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- G01N2201/129—Using chemometrical methods
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Abstract
The invention relates to a method for quickly evaluating the RAP mixing amount in a recycled asphalt mixture based on infrared spectroscopy, which comprises the following steps of preparing a recycled asphalt mixture suspension for infrared spectroscopy testing, using a liquid-moving suction pipe to drop 2 ~ 3 drops of the recycled asphalt mixture suspension on the surface of a diamond crystal, placing for 1 ~ 2min, and then adopting a Fourier transform infrared spectrometer to collect infrared spectrograms of hot recycled asphalt mixture suspension samples of plants mixed with different RAP mixing amounts so as to obtain the samplesI CO 、I SO AndI CO +I SO as an evaluation index, establishing an evaluation model between the RAP mixing amount and the evaluation index; performing infrared spectrum data acquisition on plant-mixed hot recycled asphalt mixture suspension liquid with unknown RAP mixing amount, and calculating to obtainA predicted value of RAP mixing amount in the regenerated asphalt mixture; and fourthly, comparing the on-site measured RAP mixing amount estimated value with the actual value of the RAP mixing amount in the regenerated asphalt mixture required in the construction scheme. The invention has simple operation and accurate and reliable result, and can realize the quality control detection of the on-site reclaimed materials.
Description
Technical Field
The invention relates to the technical field of research on quality control and detection of a regenerated asphalt mixture, in particular to a rapid evaluation method for RAP mixing amount in the regenerated asphalt mixture based on infrared spectroscopy.
Background
Fourier transform infrared spectroscopy (FTIR) is a kind of molecular spectrum, and its principle is that infrared rays with different frequencies are used to irradiate a test sample, when the frequency of the infrared rays is the same as the vibration frequency of chemical bonds in molecules, the molecules in the sample can absorb infrared light, and different functional groups in the molecules can be analyzed by measuring the absorbed infrared light. The infrared spectroscopic analysis technology has the advantages of high sensitivity, good repeatability and the like, and provides a reliable chemical structure research means for sample test analysis. The Fourier transform infrared spectrometer attenuated total reflection Accessory (ATR) has the advantages of simple operation, simple sample preparation, high detection precision, short test time, capability of realizing in-situ nondestructive test and the like, so the ATR is widely applied to road building materials. The diamond has the highest hardness and is not easy to scratch, is the most common ATR crystal material and is suitable for testing various samples such as liquid, powder, mucilage and the like.
More than 90% of high-grade roads built in China are asphalt pavements, a large amount of waste asphalt mixtures (RAPs) are generated in the process of overhaul, maintenance and repair every year, in order to solve the problem of environmental pollution caused by waste material discarding and realize recycling of waste resources, more and more waste asphalt mixtures are recycled for construction and repair of regenerated asphalt pavements, and the asphalt pavement regeneration technology also plays a crucial role in road construction.
At present, China guarantees the quality of a regenerated asphalt pavement through testing and research on macroscopic properties such as water stability, high-temperature stability and low-temperature crack resistance of a regenerated asphalt mixture under corresponding RAP mixing amount in a laboratory and control on construction technologies such as on-site paving and rolling. The regeneration technology has mature regeneration technology for the regenerated asphalt mixture with the RAP content of less than 25 percent, and the theoretical basis and the technical guidance for the high RAP content regenerated asphalt mixture in the aspects of design, construction and the like are lacked. Because the RAP material has larger variability, the mixing amount of the RAP in the regenerated asphalt mixture has obvious influence on the pavement performance, and determines the quality of the regenerated asphalt pavement. Therefore, the realization of real-time monitoring of the RAP mixing amount in the recycled asphalt mixture on the construction site is a key means for ensuring the quality of the recycled materials, and the application attention of the existing research on the aspect is deficient.
In conclusion, the existing research technology cannot rapidly evaluate and detect the RAP doping amount in the recycled asphalt mixture on the construction site, cannot realize quality monitoring on the recycled materials on the construction site, and infrared spectroscopy has achieved great results in the aspects of theoretical analysis, testing methods and the like since the application research of road building materials is introduced. Therefore, it is necessary to search a rapid evaluation method for RAP doping amount in the reclaimed asphalt mixture based on the infrared spectrum analysis technology as a theoretical basis.
Disclosure of Invention
The invention aims to provide an accurate and reliable rapid evaluation method for RAP mixing amount in a recycled asphalt mixture based on infrared spectroscopy.
In order to solve the problems, the method for rapidly evaluating the RAP mixing amount in the reclaimed asphalt mixture based on the infrared spectrum comprises the following steps:
preparing a regenerated asphalt mixture suspension for infrared spectrum testing:
kneading the mixed regenerated asphalt mixtures with different RAP mixing amounts respectively to completely separate regenerated materials with different particle sizes, screening the kneaded mixtures by adopting a standard square-hole sieve, selecting the regenerated asphalt mixtures under a sieve hole of 2.36mm to prepare a spectrum test sample, putting the sample into a volumetric flask, adding a trichloroethylene organic solvent with the mass-to-volume ratio of the regenerated materials to the solution of 2:1, manually shaking the volumetric flask for 2 ~ 4min to completely dissolve asphalt in the mixtures by trichloroethylene, standing for 15min to precipitate suspended filler particles, and thus obtaining a regenerated asphalt mixture suspension for infrared spectrum testing;
secondly, 2 ~ 3 drops of the recycled asphalt mixture suspension are dropped on the surface of the diamond crystal by using a liquid-moving suction pipe, the diamond crystal is placed for 1 ~ 2min, after trichloroethylene is fully volatilized, a Fourier transform infrared spectrometer is used for collecting infrared spectrograms of plant-mixed hot recycled asphalt mixture suspension samples with different RAP mixing amounts, and according to Lambert-Beer law, carbonyl indexes are used for collecting infrared spectrogramsI CO Index of sulfoxide groupI SO AndI CO +I SO as an evaluation index, establishing an evaluation model between the RAP doping amount and the evaluation index by a unitary linear regression fitting method;
thirdly, infrared spectrum data acquisition is carried out on the plant-mixed hot recycled asphalt mixture suspension liquid with unknown RAP mixing amount, the required evaluation index is calculated and is substituted into the established RAP mixing amount evaluation model, and the pre-estimated value of the RAP mixing amount in the recycled asphalt mixture is calculated;
and fourthly, comparing the on-site measured RAP mixing amount estimated value with the actual value of the RAP mixing amount in the regenerated asphalt mixture required in the construction scheme.
The method comprises the steps that the grade of the trichloroethylene is analytically pure AR, and the content is 99.0%.
In the second step, the Fourier transform infrared spectrometer adopts an attenuated total reflection accessory made of diamond crystal with the refractive index of 2.4, and the optical path of the infrared spectrometer is single reflection.
The working range of the Fourier transform infrared spectrometer in the step two is 4000 ~ 400cm-1Within wave number, the scanning times are 32 times, and the resolution is 4cm-1。
And step II, performing 6 repeated tests on each group of samples during the acquisition of the mid-infrared spectrum, and taking the average value of 6 results as the test value of the infrared spectrum data acquisition of the samples.
The step of dispersing the carbonyl indexI CO Is calculated by the formula(ii) a WhereinA C=O 1727 ~ 1654cm-1Integral of absorption peaks of carbonyl groupsArea;∑A v to remove 943 ~ 400cm-1The sum of the integral areas of all absorption peaks in the spectrum working range after the influence of the trichloroethylene absorption peak in the wave band.
The step of dispersing the sulfoxide group index in the waterI SO Is calculated by the formula(ii) a WhereinA S=O Is 1126 ~ 943cm-1Integral area of sulfoxide absorption peak;∑A v to remove 943 ~ 400cm-1The sum of the integral areas of all absorption peaks in the spectrum working range after the influence of the trichloroethylene absorption peak in the wave band.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, an infrared spectrum analysis technology is applied to an evaluation test of RAP mixing amount in the regenerated asphalt mixture, an attenuated total reflection method is adopted to collect an infrared spectrogram of a regenerated asphalt mixture sample, and a set of RAP mixing amount evaluation model is established in advance.
2. The invention provides a whole set of preparation method suitable for collecting the sample required by the infrared spectrum of the recycled asphalt mixture by an infrared spectrometer, and the preparation method defines the operation requirement of the sample in the spectrum collection process and effectively avoids the influence on the sample spectrum collection result.
3. The evaluation index adopted by the invention has good linear correlation with the RAP mixing amount in the recycled asphalt mixture, the standard deviation between parallel tests is small, and the test data has better repeatability and accuracy.
4. The method is simple to operate, can realize the rapid evaluation of the RAP doping amount in the recycled asphalt mixture on the construction site, only needs 15 ~ 20min in the whole process from the preparation of the mixture test sample to the acquisition, evaluation and calculation of the spectrogram, has small deviation between the evaluation value and the actual value of the RAP doping amount, and has accurate and reliable test data.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is an infrared spectrum of a reclaimed asphalt mixture with different RAP contents prepared by using SK90# (SK for short) as new asphalt, wherein (a) is 4000 ~ 400cm-1(b) is 3800 ~ 2600cm-1(c) 2000 ~ 600cm-1The (d) is the carbonyl area integral limit, and the (e) is the sulfoxide area integral limit.
FIG. 2 shows an RAP doping amount evaluation model (SK 90# (SK for short) as a reclaimed material prepared from new asphalt) established by using different evaluation indexes. Wherein: (a) to be composed ofI CO An evaluation model is established, (b) isI SO An evaluation model is established, and (c) isI CO +I SO And (5) establishing an evaluation model.
FIG. 3 is an infrared spectrum of a reclaimed asphalt mixture with different RAP contents prepared by using Zhehai No. 90 (ZH for short) as a new asphalt according to the present invention, wherein (a) is 4000 ~ 400cm-1(b) is 3800 ~ 2600cm-1(c) 2000 ~ 600cm-1The (d) is the carbonyl area integral limit, and the (e) is the sulfoxide area integral limit.
FIG. 4 shows an RAP doping amount evaluation model (reclaimed material prepared by Zhenhai No. 90 (ZH for short) as new asphalt) established by using different evaluation indexes. Wherein: (a) to be composed ofI CO An evaluation model is established, (b) isI SO An evaluation model is established, and (c) isI CO +I SO And (5) establishing an evaluation model.
FIG. 5 is an infrared spectrum of a reclaimed asphalt mixture with different RAP contents prepared by using KL 90# as new asphalt in the invention, wherein (a) is 4000 ~ 400cm-1(b) is 3800 ~ 2600cm-1(c) 2000 ~ 600cm-1The (d) is the carbonyl area integral limit, and the (e) is the sulfoxide area integral limit.
FIG. 6 is a diagram of RA established using different evaluation criteria according to the present inventionP mixing amount evaluation model (using refining 90# (KL for short) as reclaimed material prepared by new asphalt). Wherein: (a) to be composed ofI CO An evaluation model is established, (b) isI SO An evaluation model is established, and (c) isI CO +I SO And (5) establishing an evaluation model.
Detailed Description
The rapid evaluation method of RAP mixing amount in the recycled asphalt mixture based on infrared spectroscopy comprises the following steps:
preparing a regenerated asphalt mixture suspension for infrared spectrum testing:
kneading the mixed regenerated asphalt mixtures with different RAP mixing amounts respectively to completely separate regenerated materials with different particle sizes, screening the kneaded mixtures by using a standard square-hole sieve, selecting the regenerated asphalt mixtures under a sieve hole of 2.36mm to prepare a spectrum test sample, putting the sample into a volumetric flask, adding a trichloroethylene organic solvent with the mass-to-volume ratio of the regenerated materials to the solution of 2:1, manually shaking the volumetric flask for 2 ~ 4min to completely dissolve asphalt in the mixtures by trichloroethylene, standing for 15min to precipitate suspended filler particles, and thus obtaining the regenerated asphalt mixture suspension for infrared spectrum testing.
Wherein: trichloroethylene is produced by Shanghai chemical reagent company, and is of the grade of analytically pure AR, the content of which is 99.0 percent, and the specification of which is 500 mL.
Secondly, 2 ~ 3 drops of recycled asphalt mixture suspension are dropped on the surface of a diamond crystal by using a liquid-moving suction pipe, the diamond crystal is placed for 1 ~ 2min until trichloroethylene is fully volatilized, a Fourier transform infrared spectrometer is used for collecting infrared spectrograms of plant-mixed hot recycled asphalt mixture suspension samples with different RAP mixing amounts, each group of samples are subjected to 6 repeated tests, the average value of 6 results is taken as the test value of infrared spectrogram data collection of the samples, and the RAP mixing amount evaluation index is a relevant index for representing the aging degree of asphalt according to Lambert-Beer law, namely, the carbonyl index is taken as a relevant index for representing the aging degree of the asphaltI CO Index of sulfoxide groupI SO AndI CO +I SO as an evaluation index, establishing an evaluation model between the RAP doping amount and the evaluation index by a unitary linear regression fitting method; and (4) carrying out significance test on the regression equation obtained by fitting by using a correlation coefficient test method, and determining a coefficient critical value when the significance level is alpha =0.05。
Wherein: the Fourier transform infrared spectrometer adopts an attenuated total reflection accessory made of diamond crystal with the refractive index of 2.4, and the optical path of the accessory is single reflection.
The working range of the Fourier transform infrared spectrometer is 4000 ~ 400cm-1Within wave number, the scanning times are 32 times, and the resolution is 4cm-1。
Index of carbonyl groupI CO Is calculated by the formula(ii) a WhereinA C=O 1727 ~ 1654cm-1Integral area of carbonyl absorption peak between;∑A v to remove 943 ~ 400cm-1The sum of the integral areas of all absorption peaks in the spectrum working range after the influence of the trichloroethylene absorption peak in the wave band.
Index of sulfoxide groupI SO Is calculated by the formula(ii) a WhereinA S=O Is 1126 ~ 943cm-1Integral area of sulfoxide absorption peak;∑A v to remove 943 ~ 400cm-1The sum of the integral areas of all absorption peaks in the spectrum working range after the influence of the trichloroethylene absorption peak in the wave band.
Index of carbonyl groupI CO And index of sulfoxide groupI SO The integral area of the absorption peak is calculated by taking the tangent line of the lowest point at both sides of the absorption peak as a correction base line.
Thirdly, infrared spectrum data acquisition is carried out on the plant-mixed hot recycled asphalt mixture suspension liquid with unknown RAP mixing amount, 6 repeated tests are carried out on each group of samples, and the average value of the 6 results is taken as the test value of infrared spectrum data acquisition of the samples. Calculating required evaluation indexes, and substituting the evaluation indexes into the established RAP mixing amount evaluation model to calculate and obtain a predicted value of the RAP mixing amount in the regenerated asphalt mixture;
and fourthly, comparing the on-site measured RAP mixing amount estimated value with the actual value of the RAP mixing amount in the regenerated asphalt mixture required in the construction scheme, realizing real-time monitoring of the RAP mixing amount in the regenerated material used in the construction site, and strictly controlling the quality of the regenerated asphalt mixture.
In the following examples, a Nicolet iS5 type fourier transform infrared spectrometer manufactured by seimer feishell scientific and technology, and a matched iD5 ATR accessory were used to collect the infrared spectrogram of the prepared reclaimed asphalt mixture suspension.
Example 1
Taking plant-mixed hot recycled asphalt mixtures (AC-20) with different RAP mixing amounts prepared by taking SK90# (SK for short) as new asphalt as an example, the testing and evaluating steps of the RAP mixing amount are as follows:
1. selecting SK as new asphalt, preparing plant-mixed hot recycled asphalt mixtures with different RAP mixing amounts in a laboratory according to technical Specification for road asphalt pavement regeneration (JTG F41-2008), kneading the mixed recycled asphalt mixtures to completely separate the recycled materials with different particle sizes, screening the kneaded mixtures by using a standard square hole screen, and selecting the optimal particle size to prepare a spectrum collection suspension sample of the recycled asphalt mixture.
2. Placing the recycled asphalt mixture with the required particle size into a volumetric flask, then adding a trichloroethylene organic solvent in a corresponding proportion, manually shaking the volumetric flask for 2 ~ 4min to completely dissolve asphalt in the mixture by trichloroethylene, standing for 15min to precipitate suspended filler particles, and preparing a recycled asphalt mixture suspension sample for infrared spectroscopy test.
3. Before sample testing, the spectrometer is required to be opened for preheating, instrument performance is confirmed, a diamond ATR accessory is installed, and light is emitted after automatic identification of the instrumentCollimation of the optical bench, setting the number of acquisition and scanning times to be 32 times after the collimation is finished, and setting the resolution to be 4cm-1And automatic atmospheric background subtraction is selected. Firstly, acquiring a background spectrogram, then acquiring infrared spectrograms of regenerated asphalt mixture suspension samples with different RAP mixing amounts prepared by taking SK as new asphalt, acquiring 6-time parallel spectrograms of each group of samples, and taking the average value of the parallel spectrograms as a test spectrogram, wherein the average value is shown in figure 1 (a).
4. The RAP doping amount is respectively 0%, 20%, 40%, 60% and 80% to establish an evaluation model, corresponding evaluation indexes are calculated before the model is established, the adopted evaluation indexes are calculated by peak area ratios, corresponding absorption peak integral areas in a spectrogram are shown in figures 1 (b) and (c), and area integral limits of carbonyl and sulfoxide group absorption peaks are marked in figures 1 (d) and (e).
According to the formulaAnd formulaCalculating spectral data acquired by using SK as new asphalt to prepare recycled asphalt mixtureI CO AndI SO see table 1.
TABLE 1I CO AndI SO calculation result (SK regeneration material)
5. By usingI CO 、I SO AndI CO +I SO as evaluation indexes, respectively establishing evaluation models of RAP mixing amount in the recycled asphalt mixture by a unitary linear regression fitting method, as shown in a figure 2 (a) ~ (c), selecting the recycled asphalt mixture with the RAP mixing amount respectively being 10%, 30% and 50% which does not participate in the establishment of the evaluation models to verify the models, and calculating the calculated RAP estimated value and the actual value thereof by different evaluation modelsThe results are shown in Table 2.
TABLE 2 estimation of RAP doping by different evaluation models (SK regrind)
Example 2
Taking plant-mixed hot recycled asphalt mixture (AC-20) with different RAP mixing amounts prepared by using Zhehai 90# (ZH for short) as new asphalt as an example, the testing and evaluating steps of the RAP mixing amount are as follows:
1. ZH is selected as new asphalt, plant-mixed hot recycled asphalt mixtures with different RAP mixing amounts are prepared in a laboratory according to technical Specification for road asphalt pavement regeneration (JTG F41-2008), the mixed recycled asphalt mixtures are kneaded to completely separate recycled materials with different particle sizes, the kneaded mixtures are screened by a standard square-hole screen, and the required optimal particle size is selected for preparing a spectrum collection suspension sample of the recycled asphalt mixtures.
2. Placing the recycled asphalt mixture with the required particle size into a volumetric flask, then adding a trichloroethylene organic solvent in a corresponding proportion, manually shaking the volumetric flask for 2 ~ 4min to completely dissolve asphalt in the mixture by trichloroethylene, standing for 15min to precipitate suspended filler particles, and preparing a recycled asphalt mixture suspension sample for infrared spectroscopy test.
3. Opening a spectrometer for preheating and confirming the performance of the spectrometer before testing a sample, installing a diamond ATR accessory, carrying out collimation on an optical table after automatic identification of the spectrometer, and setting the acquisition scanning times to be 32 times and the resolution to be 4cm after the collimation is finished-1And automatic atmospheric background subtraction is selected. Firstly, collecting a background spectrogram, then collecting infrared spectrograms of regenerated asphalt mixture suspension samples with different RAP mixing amounts prepared by taking ZH as new asphalt, and collecting 6 parallel spectrograms of each group of samples and taking the average value thereof as a test spectrogram, as shown in figure 3 (a).
4. The RAP doping amount is respectively 0%, 20%, 40%, 60% and 80% to establish an evaluation model, corresponding evaluation indexes are calculated before the model is established, the adopted evaluation indexes are calculated by peak area ratios, corresponding absorption peak integral areas in a spectrogram are shown in fig. 3 (b) and (c), and area integral limits of carbonyl and sulfoxide group absorption peaks are marked in fig. 3 (d) and (e).
According to the formulaAnd formulaCalculating the spectral data collected from the regenerated asphalt mixture prepared by using ZH as new asphaltI CO AndI SO see table 3.
TABLE 3I CO AndI SO calculation results (ZH regrind)
5. By usingI CO 、I SO AndI CO +I SO as evaluation indexes, evaluation models of the RAP contents in the reclaimed asphalt mixture are respectively established by a unitary linear regression fitting method, as shown in fig. 4 (a) ~ (c), the reclaimed asphalt mixture with the RAP contents of 10%, 30% and 50% respectively, which is not involved in the establishment of the evaluation models, is selected for model verification, and comparison results between the predicted RAP value and the actual RAP value obtained by calculation through different evaluation models are shown in table 4.
TABLE 4 estimation of RAP incorporation by different evaluation models (ZH regrind)
Example 3
Taking plant-mixed hot recycled asphalt mixture (AC-20) with different RAP mixing amounts prepared by taking KL 90# (KL for short) as new asphalt as an example, the testing and evaluating steps of the RAP mixing amount are as follows:
1. selecting KL as new asphalt, preparing plant-mixed hot recycled asphalt mixtures with different RAP mixing amounts in a laboratory according to technical Specification for road asphalt pavement regeneration (JTG F41-2008), kneading the mixed recycled asphalt mixtures to completely separate the recycled materials with different particle sizes, screening the kneaded mixtures by using a standard square-hole screen, and selecting the required optimal particle size to prepare a spectrum collection suspension sample of the recycled asphalt mixture.
2. Placing the recycled asphalt mixture with the required particle size into a volumetric flask, then adding a trichloroethylene organic solvent in a corresponding proportion, manually shaking the volumetric flask for 2 ~ 4min to completely dissolve asphalt in the mixture by trichloroethylene, standing for 15min to precipitate suspended filler particles, and preparing a recycled asphalt mixture suspension sample for infrared spectroscopy test.
3. Opening a spectrometer for preheating and confirming the performance of the spectrometer before testing a sample, installing a diamond ATR accessory, carrying out collimation on an optical table after automatic identification of the spectrometer, and setting the acquisition scanning times to be 32 times and the resolution to be 4cm after the collimation is finished-1And automatic atmospheric background subtraction is selected. Firstly, a background spectrogram is collected, then infrared spectrograms of regenerated asphalt mixture suspension samples with different RAP mixing amounts prepared by taking KL as new asphalt are collected, and each group of samples collects 6 times of parallel spectrograms and takes the average value thereof as a test spectrogram, which is shown in figure 5 (a).
4. The RAP doping amount is respectively 0%, 20%, 40%, 60% and 80% to establish an evaluation model, corresponding evaluation indexes are calculated before the model is established, the adopted evaluation indexes are calculated by peak area ratios, corresponding absorption peak integral areas in a spectrogram are shown in fig. 5 (b) and (c), and area integral limits of carbonyl and sulfoxide group absorption peaks are marked in fig. 5 (d) and (e).
According to the formulaAnd formulaCalculating the spectrum data collected by the regenerated asphalt mixture prepared by taking KL as new asphaltI CO AndI SO see table 5.
TABLE 5I CO AndI SO calculation results (KL regrind)
5. By usingI CO 、I SO AndI CO +I SO as evaluation indexes, evaluation models of the RAP content in the reclaimed asphalt mixture are respectively established by a unitary linear regression fitting method, as shown in fig. 6 (a) - (c). And selecting the recycled asphalt mixture with the RAP mixing amounts respectively being 10%, 30% and 50% and not participating in the establishment of the evaluation model to verify the model, and calculating comparison results between the obtained RAP predicted value and the actual value through different evaluation models, wherein the comparison results are shown in Table 6.
TABLE 6 estimation of RAP doping by different evaluation models (KL regenerant)
The above embodiments are only for explaining the present invention in detail, and are not meant to limit the scope of the invention, and all alternatives and modifications based on other related technical means and operation methods are included in the scope of the invention.
Claims (7)
1. The rapid evaluation method of RAP mixing amount in the recycled asphalt mixture based on infrared spectroscopy comprises the following steps:
preparing a regenerated asphalt mixture suspension for infrared spectrum testing:
kneading the mixed regenerated asphalt mixtures with different RAP mixing amounts respectively to completely separate regenerated materials with different particle sizes, screening the kneaded mixtures by adopting a standard square-hole sieve, selecting the regenerated asphalt mixtures under a sieve hole of 2.36mm to prepare a spectrum test sample, putting the sample into a volumetric flask, adding a trichloroethylene organic solvent with the mass-to-volume ratio of the regenerated materials to the solution of 2:1, manually shaking the volumetric flask for 2 ~ 4min to completely dissolve asphalt in the mixtures by trichloroethylene, standing for 15min to precipitate suspended filler particles, and thus obtaining a regenerated asphalt mixture suspension for infrared spectrum testing;
secondly, 2 ~ 3 drops of the recycled asphalt mixture suspension are dropped on the surface of the diamond crystal by using a liquid-moving suction pipe, the sample is placed for 1 ~ 2min, after trichloroethylene is fully volatilized, the infrared spectrometer with Fourier transform is adopted to collect infrared spectrograms of plant-mixed hot recycled asphalt mixture suspension samples with different RAP mixing amounts, and according to the Lambert-beer law, the carbonyl index is used for collecting the infrared spectrogramsI CO Index of sulfoxide groupI SO AndI CO +I SO as an evaluation index, establishing an evaluation model between the RAP doping amount and the evaluation index by a unitary linear regression fitting method;
thirdly, infrared spectrum data acquisition is carried out on the plant-mixed hot recycled asphalt mixture suspension liquid with unknown RAP mixing amount, the required evaluation index is calculated and is substituted into the established RAP mixing amount evaluation model, and the pre-estimated value of the RAP mixing amount in the recycled asphalt mixture is calculated;
and fourthly, comparing the on-site measured RAP mixing amount estimated value with the actual value of the RAP mixing amount in the regenerated asphalt mixture required in the construction scheme.
2. The method for rapidly evaluating the RAP mixing amount in the reclaimed asphalt mixture based on the infrared spectrum as set forth in claim 1, wherein the RAP mixing amount is: the method comprises the steps that the grade of the trichloroethylene is analytically pure AR, and the content is 99.0%.
3. The method for rapidly evaluating the RAP mixing amount in the reclaimed asphalt mixture based on the infrared spectrum as set forth in claim 1, wherein the RAP mixing amount is: in the second step, the Fourier transform infrared spectrometer adopts an attenuated total reflection accessory made of diamond crystal with the refractive index of 2.4, and the optical path of the infrared spectrometer is single reflection.
4. The method for rapidly evaluating the RAP mixing amount in the reclaimed asphalt mixture based on the infrared spectroscopy as claimed in claim 1, characterized in that the Fourier transform infrared spectrometer has a working range of 4000 ~ 400cm in the step II-1Within wave number, the scanning times are 32 times, and the resolution is 4cm-1。
5. The method for rapidly evaluating the RAP mixing amount in the reclaimed asphalt mixture based on the infrared spectrum as set forth in claim 1, wherein the RAP mixing amount is: and step II, performing 6 repeated tests on each group of samples during the acquisition of the mid-infrared spectrum, and taking the average value of 6 results as the test value of the infrared spectrum data acquisition of the samples.
6. The method for rapidly evaluating the RAP mixing amount in the reclaimed asphalt mixture based on the infrared spectrum as set forth in claim 1, wherein the RAP mixing amount is: the step of dispersing the carbonyl indexI CO Is calculated by the formula(ii) a WhereinA C=O 1727 ~ 1654cm-1Integral area of carbonyl absorption peak between;∑A v to remove 943 ~ 400cm-1The sum of the integral areas of all absorption peaks in the spectrum working range after the influence of the trichloroethylene absorption peak in the wave band.
7. The method for rapidly evaluating the RAP mixing amount in the reclaimed asphalt mixture based on the infrared spectrum as set forth in claim 1, wherein the RAP mixing amount is: the step of dispersing the sulfoxide group index in the waterI SO Is calculated by the formula(ii) a WhereinA S=O Is 1126 ~ 943cm-1Integral area of sulfoxide absorption peak;∑A v to remove 943 ~ 400cm-1The sum of the integral areas of all absorption peaks in the spectrum working range after the influence of the trichloroethylene absorption peak in the wave band.
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