CN113188971B - Non-reactive asphalt regenerant permeability evaluation method - Google Patents
Non-reactive asphalt regenerant permeability evaluation method Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 150
- 239000012492 regenerant Substances 0.000 title claims abstract description 105
- 230000035699 permeability Effects 0.000 title claims abstract description 17
- 238000011156 evaluation Methods 0.000 title claims abstract description 12
- 230000035515 penetration Effects 0.000 claims abstract description 88
- 238000012360 testing method Methods 0.000 claims abstract description 60
- 238000001228 spectrum Methods 0.000 claims abstract description 42
- 238000002329 infrared spectrum Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000002156 mixing Methods 0.000 claims abstract description 24
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 125000000524 functional group Chemical group 0.000 claims abstract description 17
- 238000011069 regeneration method Methods 0.000 claims abstract description 10
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 238000005056 compaction Methods 0.000 claims abstract description 7
- 230000009467 reduction Effects 0.000 claims abstract description 6
- 238000001764 infiltration Methods 0.000 claims abstract description 3
- 230000008595 infiltration Effects 0.000 claims abstract description 3
- 238000010521 absorption reaction Methods 0.000 claims description 26
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 229920002545 silicone oil Polymers 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 230000003595 spectral effect Effects 0.000 claims description 8
- 238000004064 recycling Methods 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000002835 absorbance Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 241000973497 Siphonognathus argyrophanes Species 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims 3
- 230000032683 aging Effects 0.000 claims 1
- 238000002386 leaching Methods 0.000 claims 1
- 230000008929 regeneration Effects 0.000 abstract description 7
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- 238000000862 absorption spectrum Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003716 rejuvenation Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 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
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
-
- 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
- G01N21/3563—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing solids; Preparation of samples therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
-
- 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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention relates to a method for evaluating the permeability of a non-reactive asphalt regenerant, which comprises the following steps: preparing an aged asphalt sample and a regenerant sample, and acquiring infrared spectrums of the two samples; acquiring actual mixing, transportation, paving, compacting and a whole-course cooling curve of a later stage; preparing a penetration test tube of the aged asphalt and the regenerant; carrying out heat preservation on the test tube in a water bath kettle; preparing FTIR samples of the aged asphalt after infiltration; calculating the penetration parameter of the aged asphalt sample after the penetration of the regenerant, and calculating the wave number penetration spectrum on the basis of the penetration parameterS(k)‑kCurve, depth penetration spectrumS(d)‑dCurve, time permeation spectrumS(t)‑tA curve; the method directly judges the permeation condition of each component in the regenerant in the aged asphalt from the angle of a functional group, introduces the whole-course temperature reduction curve concepts of actual mixing, transportation, paving, compaction and later stages in sample heat preservation, is suitable for evaluating the permeation capability of the non-reactive asphalt regenerant in thermal regeneration, and enables the evaluation result to be more in line with the actual engineering.
Description
Technical Field
The invention relates to a method for evaluating the permeability of a non-reactive asphalt regenerant, belonging to the field of road engineering.
Background
The nonreactive asphalt regenerant basically does not have chemical reaction with aged asphalt in the regeneration process, and is a regenerant commonly used in the thermal regeneration of asphalt mixtures.
In the existing method, three tests such as indexes, viscosity and the like are mostly carried out on the aged asphalt slices after the regenerant permeates, the permeation condition of the regenerant in each layer is indirectly reflected through the change of the macroscopic indexes of the samples, meanwhile, the heat preservation temperature of the samples during permeation is mostly set as the mixing temperature of the regenerant and the old asphalt mixture during actual thermal regeneration, the change of the temperature field of the aged asphalt in the whole process of subsequent transportation, paving and compaction until the regenerated asphalt mixture is cooled to the environmental temperature is not considered, and the test result is deviated from the actual condition. Therefore, it is highly desirable to provide a new evaluation method to make the evaluation result more consistent with the actual engineering.
Disclosure of Invention
The invention provides a method for evaluating the permeability of a non-reactive asphalt regenerant, which directly judges the permeability of each component in the regenerant in aged asphalt from the perspective of a functional group, and introduces the whole-process cooling curve concepts of actual mixing, transportation, paving, compacting and later stages in sample heat preservation, so that the evaluation result is more in line with the actual engineering.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for evaluating the permeability of a non-reactive asphalt regenerant comprises the following steps:
firstly, preparing an aged asphalt sample and a regenerant sample, and acquiring infrared spectrums of the aged asphalt sample and the regenerant sample;
secondly, adding a regenerant sample into the aged asphalt sample to obtain a whole-process temperature reduction curve of actual mixing, transportation, paving, compaction and a later stage;
thirdly, preparing a penetration test tube of the aged asphalt and the regenerant;
fourthly, preserving the heat of the test tube in a water bath kettle;
fifthly, preparing an FTIR sample of the aged asphalt after permeation;
sixthly, calculating the penetration parameter of the aged asphalt sample after the penetration of the regenerant, and defining the penetration parameter as S (k, d)i,tq) Calculating wavenumber penetration spectrum S (k) -k curve, depth penetration spectrum S (d) -d curve and time penetration spectrum S (t) -t curve for evaluatingPenetration performance of asphalt regenerant;
as a further preferred embodiment of the present invention, in the first step, Fourier transform infrared absorption spectroscopy scanning is applied to the aged asphalt sample and the regenerant sample to obtain infrared spectra of the aged asphalt sample and the regenerant sample with wave numbers between k1 and k2, wherein the infrared spectrum absorptivity of the aged asphalt sample is denoted as X1(k) The infrared spectral absorption of the regenerant sample is recorded as X2(k)；
In a further preferred embodiment of the present invention, in the second step, a regenerant sample is added to the aged asphalt sample and mixed, and the mixing temperature T is set during the mixing0Setting the whole-course temperature-reducing curve as T when the temperature in the transportation, paving, compacting and later stages is reduced along with the increase of timea(t)；
Wherein, the mixing completion time is defined as t 00, i.e. the cooling curve satisfies Ta(t0)＝T0Timing to t1When the temperature of the asphalt mixture is reduced to the on-site environment temperature of T1I.e. the cooling curve satisfies Ta(t1)＝T1Simulation of obtaining t in actual thermal regeneration0To t1Whole section cooling curve T betweena(t)；
As a further preferable aspect of the present invention, in the third step, a test tube having a diameter D is taken, aged asphalt, a regenerating agent and fresh asphalt are sequentially injected from the bottom to the top of the test tube, and the temperature is previously heated to T at the time of injecting the aged asphalt, the regenerating agent and the fresh asphalt0；
As a further preferred aspect of the present invention, in the fourth step, the test tube is vertically placed in the water bath, the test tube opening is opened, and the whole temperature reduction curve T obtained in the second step is useda(t) reducing the temperature of the silicone oil in the water bath;
when the time is t1While the temperature of the silicone oil is reduced to T1Then keeping the temperature of the silicone oil in the water bath at T1Keeping constant, keeping the temperature until the moment is t2Stopping heat preservation, namely the temperature T (t) of the silicon oil in the water bath kettle meets the following formula:
as a further preferred aspect of the present invention, in the fifth step, the specific process for preparing FTIR test samples of the aged asphalt after infiltration is as follows:
at the 51 st step, at the time tqTaking out the test tube, placing the test tube in flowing cold water, rapidly cooling to room temperature, breaking the test tube after the aged asphalt section is solidified and molded, removing the new asphalt and regenerant section, taking out the aged asphalt section, cleaning the aged asphalt section with clear water, and wiping the aged asphalt section to dry;
step 52, averagely cutting the aged asphalt section into m sections, wherein the part positioned in the test tube and next to the regenerant section is marked as a section 1, and the part positioned at the bottom in the test tube is marked as an mth section;
step 53, taking the central part of each section of m sections to prepare a sample, and defining the depth of the sampling center as d1—dmWherein the depth of the contact surface of the aged asphalt and the regenerant is defined as 0;
step 54, scanning the obtained samples by a Fourier transform infrared absorption spectrometer to obtain the infrared spectrum of each sample, wherein the abscissa of the obtained infrared spectrum is k (cm)-1) The ordinate is the spectral absorbance X (%);
at tqThe water bath is taken out at the end of the time to a depth diThe infrared spectrum absorption rate of the aged asphalt sample after penetrating the regenerant is X after scanning by a Fourier transform infrared absorption spectrometer3(k,di,tq) Wherein, 0<tq≤t2I is any segment from 1 to m;
as a further preferred aspect of the present invention, in the sixth step, the penetration parameter S (k, d) of the aged asphalt sample after penetration of the rejuvenating agenti,tq) The calculating method comprises the following steps:
for the infrared spectrum absorption value X of the aged asphalt after permeation of the non-reactive regenerant and the regenerant at the wave number k3i(k) Considered as the original aged asphalt absorption value X1(k) And the regenerant absorption value X2(k) As a result of linear superposition, i.e.
X3(k,di,tq)＝(1-S(k,di,tq))X1(k)+S(k,di,tq)X2(k) (2)
In the formula (2), S (k) represents the mass fraction of the regenerant in the regenerated aged asphalt at the component corresponding to the wave number k;
the penetration parameter is determined by the formula (2), i.e.
As a further preference of the invention, based on the permeation parameters S (k, d)i,tq) Acquiring a wavenumber penetration spectrum S (k) -k curve for analyzing tqAt a certain depth d in the regenerantiThe penetration degree difference of various functional groups in the aged asphalt is as follows:
611 th step, test tube is taken at tqThe water bath is ended at this point, according to the fifth step, the test tube is taken out to a depth diThe infrared spectrum of the sample is detected, and the penetration parameter S (k, d) at different wave numbers k in the infrared spectrum of the sample is calculated according to the formula (3)i,tq) Due to di,tqAre all constant values, the wave number k is variable, so S (k, d)i,tq) It can be abbreviated as S (k);
step 612, drawing S (k) values under different wavenumbers k in a rectangular coordinate system to obtain a wavenumber penetration spectrum S (k) -k curve;
as a further preference of the invention, based on the permeation parameters S (k, d)i,tq) Obtaining a depth penetration spectrum S (d) -d curve for analyzing tqThe penetration degree difference of the functional group in the regenerant at different depths in the aged asphalt comprises the following specific steps:
621, taking test tube at tqThe water bath is ended at this point, according to the fifth step, the test tube is taken out to a depth d1—dmRespectively detecting the infrared spectra of the samples, and calculating the wave number k in the infrared spectrum of the sample with the depth d according to the formula (3)aThe permeation parameter of (A) is S (k)a,d,tq) Wherein d is1≤d≤dmDue to ka,tqAll are constant values, and the sample depth d is variable, so S (k)a,d,tq) It can be abbreviated as S (d);
step 622, drawing S (d) values at different depths d in a rectangular coordinate system, wherein d1≤d≤dmObtaining a depth penetration spectrum S (d) -d curve;
as a further preference of the invention, based on the permeation parameters S (k, d)i,tq) Acquiring a time permeability spectrum S (t) -t curve for analyzing the difference of the penetration degree of the functional group in the regenerant at different moments in the aged asphalt at a certain depth, wherein the specific method comprises the following steps:
631, taking multiple test tubes at different times t, wherein 0<t≤t2Ending the water bath, according to the fifth step, taking the test tubes to the same depth diRespectively detecting the infrared spectra of the samples, wherein d1≤di≤dmFrom equation (3), the depth d can be calculatediWave number k in infrared spectrum of sampleaPenetration parameter S (k) of (C)a,diT) in which d1≤di≤dmDue to ka,diAll are constant values, the end time t of the water bath is variable, and therefore S (k)a,diT) can be abbreviated as S (t);
632, drawing the S (t) values under different water bath time t in a rectangular coordinate system, wherein 0<t≤t2And obtaining a depth penetration spectrum S (t) -t curve.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the method can directly judge the penetration condition of each component in the regenerant in the aged asphalt from the perspective of the functional group, and is suitable for evaluating the penetration capability of a non-reactive asphalt regenerant in thermal regeneration;
2. the evaluation method provided by the invention introduces the whole-course cooling curve concept of actual mixing, transportation, paving, compacting and later stages, so that the evaluation result is more in line with the actual engineering.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a wavenumber permeance spectrum of a first preferred embodiment provided by the present invention;
FIG. 2 is a depth penetration spectrum of a second preferred embodiment provided by the present invention;
FIG. 3 is a time-permeance spectrum of a third preferred embodiment of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. In the description of the present application, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
Aiming at the current situation that the test result is deviated from the actual situation because the change of an aged asphalt temperature field in the whole process of subsequent transportation, paving and compaction until the regenerated asphalt mixture is cooled to the environmental temperature is not considered in the prior art, the application aims to provide the non-reactive asphalt regenerant permeability evaluation method, so that the problems pointed out in the background art are solved.
Specifically, the method comprises the following steps of,
firstly, preparing an aged asphalt sample and a regenerant sample, and acquiring infrared spectrums of the aged asphalt sample and the regenerant sample;
fourier transform infrared absorption spectrometer (FTIR) scanning is applied to the aged asphalt sample and the regenerant sample to obtain infrared spectra of the aged asphalt sample and the regenerant sample with wave numbers between k1 and k2, wherein the abscissa is defined as k (cm)-1) The ordinate is defined as the spectral absorbance X (%); it is composed ofThe infrared spectrum absorption rate of the aged asphalt sample is recorded as X1(k) The infrared spectral absorption of the regenerant sample is recorded as X2(k)；
For convenience of statistics, k1 was set at 200-500cm-1K2 is set at 4000-5000cm-1。
Secondly, adding a regenerant sample into the aged asphalt sample to obtain a whole-process temperature reduction curve of actual mixing, transportation, paving, compaction and a later stage;
adding a regenerant sample into the aged asphalt sample, mixing, and setting the mixing temperature to be T during the mixing process because the hot regeneration mixing time is short and the mixing temperature is considered to be constant during the mixing0The temperature in the transportation, paving, compacting and later stages after mixing is reduced along with the increase of time, and the whole-course temperature reduction curve is set as Ta(t)；
Wherein, the time for the asphalt mixture to be cooled to the on-site temperature in the processes of transportation, paving, compaction and later mixing is far longer than the hot regeneration mixing time, so the mixing stage can be omitted, and the mixing finishing moment is directly defined as t 00, i.e. the cooling curve satisfies Ta(t0)＝T0Timing to t1When the temperature of the asphalt mixture is reduced to the site environment temperature of T1I.e. the cooling curve satisfies Ta(t1)＝T1Simulation of obtaining t in actual thermal regeneration0To t1Whole section cooling curve T betweena(t)；
It should be noted that the whole-course cooling curve of the actual mixing, transporting, paving, compacting and later stages can be obtained by establishing a finite element thermodynamic model.
Thirdly, preparing a penetration test tube of the aged asphalt and the regenerant;
specifically, a test tube with the diameter D is taken, aged asphalt, regenerant and new asphalt are sequentially injected from the bottom to the top of the test tube, and the temperature is preheated to T when the aged asphalt, the regenerant and the new asphalt are injected0(ii) a In the experiment, in order to measure conveniently, a test tube with the diameter D of 1cm-3cm can be selected, and the height value of the aged asphalt sectionThe range is 4cm-6 cm.
Fourthly, preserving the heat of the test tube in a water bath kettle;
vertically placing the test tube in a water bath, opening the test tube mouth, and obtaining a full-section cooling curve T according to the second stepa(t) reducing the temperature of the silicone oil in the water bath;
when the time is t1While the temperature of the silicone oil is reduced to T1Then keeping the temperature of the silicone oil in the water bath at T1Keeping constant, and keeping the temperature until the moment is t2When (i.e. the continuous heat preservation time is (t)2-t1) Terminating the heat preservation, namely the temperature T (t) of the silicon oil in the water bath kettle meets the following formula:
fifthly, preparing an FTIR sample of the aged asphalt after permeation;
the specific procedure for preparing FTIR samples of post-penetration aged bitumen was:
at the 51 st step, at the time tqTaking out the test tube, placing the test tube in flowing cold water, rapidly cooling to room temperature, breaking the test tube after the aged asphalt section is solidified and molded, removing the new asphalt and regenerant section, taking out the aged asphalt section, cleaning the aged asphalt section with clear water, and wiping the aged asphalt section to dry;
step 52, averagely cutting the aged asphalt section into m sections, wherein the part positioned in the test tube and next to the regenerant section is marked as a section 1, and the part positioned at the bottom in the test tube is marked as an mth section;
step 53, taking the central part of each section of m sections to prepare a sample, and defining the depth of the sampling center as d1—dmWherein the depth of the contact surface of the aged asphalt and the regenerant is defined as 0; the reason for taking the central part of each section is that the surface tension of the regenerant at the edge is close to the wall of the test tube to prevent the regenerant from permeating downwards, so that the experimental result is misaligned;
step 54, scanning the obtained samples by a Fourier transform infrared absorption spectrometer (FTIR) to obtain the infrared spectrum of each sample, wherein the abscissa of the obtained infrared spectrum is k (cm)-1) The ordinate is the spectral absorption X (%), the spectral wavenumber range measured by the test needs to be consistent with that in the first step, i.e. k1 is set at 200--1K2 is set at 4000-5000cm-1；
At tqThe water bath is taken out at the end of the time to a depth diThe infrared spectrum absorption rate of the aged asphalt sample after penetrating the regenerant is X after scanning by a Fourier transform infrared absorption spectrometer3(k,di,tq) Wherein, 0<tq≤t2And i is any section of 1-m, and the height value of the aged asphalt obtained by cutting and segmenting each section of the regenerant after permeation is 0.5-1 cm for convenient detection.
Sixthly, calculating the penetration parameter of the aged asphalt sample after the penetration of the regenerant, and defining the penetration parameter as S (k, d)i,tq) Calculating a wavenumber penetration spectrum S (k) -k curve, a depth penetration spectrum S (d) -d curve and a time penetration spectrum S (t) -t curve on the basis of the wave number penetration spectrum S (k) -k curve and the depth penetration spectrum S (d) -d curve for evaluating the penetration performance of the asphalt regenerating agent;
in particular, the penetration parameter S (k, d) of the aged asphalt sample after penetration of the rejuvenating agenti,tq) The calculating method comprises the following steps:
for the infrared spectrum absorption value X of the aged asphalt after permeation of the non-reactive regenerant and the regenerant at the wave number k3i(k) Considered as the original aged asphalt absorption value X1(k) With regenerator absorption value X2(k) As a result of linear superposition, i.e.
X3(k,di,tq)＝(1-S(k,di,tq))X1(k)+S(k,di,tq)X2(k) (2)
In the formula (2), S (k) represents the mass fraction of the regenerant in the regenerated aged asphalt at the component corresponding to the wave number k;
the penetration parameter is determined by the formula (2), i.e.
Then based on the penetration parameter S (k, d)i,tq) Three indexes for performance evaluation are obtained, and specific explanation is given below:
acquiring a wave number penetration spectrum S (k) -k curve for analyzing tqAt a certain depth d in the regenerantiThe penetration degree difference of various functional groups in the aged asphalt is as follows:
611 th step, test tube is taken at tqEnding the water bath at the moment, according to the fifth step, taking the test tube to a depth diThe infrared spectrum of the sample is detected, and the penetration parameter S (k, d) at different wave numbers k in the infrared spectrum of the sample is calculated according to the formula (3)i,tq) Due to di,tqAre all constant values, the wave number k is variable, so S (k, d)i,tq) S (k) for short;
and step 612, drawing the S (k) values under different wavenumbers k in a rectangular coordinate system to obtain a wavenumber penetration spectrum S (k) -k curve.
Secondly, acquiring a depth penetration spectrum S (d) -d curve for analyzing tqThe penetration degree difference of the functional group in the regenerant at different time in the aged asphalt with different depths comprises the following specific steps:
621, taking test tube at tqThe water bath is ended at this point, according to the fifth step, the test tube is taken out to a depth d1—dmRespectively detecting the infrared spectra of the samples, and calculating the wave number k in the infrared spectrum of the sample with the depth d according to the formula (3)aThe permeation parameter of (A) is S (k)a,d,tq) Wherein d is1≤d≤dmDue to ka,tqAll are constant values, and the sample depth d is variable, so S (k)a,d,tq) It can be abbreviated as S (d);
step 622, drawing S (d) values at different depths d in a rectangular coordinate system, wherein d1≤d≤dmAnd obtaining a depth penetration spectrum S (d) -d curve.
Thirdly, obtaining a time permeability spectrum S (t) -t curve for analyzing the difference of the penetration degree of the functional group in the regenerant at different moments in the aged asphalt at a certain depth, wherein the specific method comprises the following steps:
631, taking multiple test tubesAt different times t, wherein 0<t≤t2Ending the water bath, according to the fifth step, taking the test tubes to the same depth diRespectively detecting the infrared spectra of the samples, wherein d1≤di≤dmFrom equation (3), the depth d can be calculatediSample infrared spectrum wavenumber kaPenetration parameter S (k) ofa,diT) in which d1≤di≤dmDue to ka,diAll are constant values, and the end time t of the water bath is variable, so that S (k)a,diT) can be abbreviated as S (t);
step 632, plotting the S (t) values under different water bath time t in a rectangular coordinate system, wherein 0<t≤t2And obtaining a depth penetration spectrum S (t) -t curve.
In order to better verify the penetration evaluation method of the non-reactive asphalt recycling agent provided by the application, the applicant also provides a part of representative examples of the application.
The first embodiment is as follows:
and for a certain non-reactive regenerant, in the fifth step, the mass weight ratio of the aged asphalt to the regenerant to the new asphalt is 100:12:100 during sample preparation, the height of the aged asphalt is 5cm, and the aged asphalt is uniformly cut into 5 sections from top to bottom. Temperature lowering curve Ta(t) holding the sample for 2.5 hours until the temperature of the sample is reduced to the set ambient temperature, as obtained by finite element numerical simulation. Calculating the wavenumber permeance spectrum S (k) -k curve of the sample in the aged asphalt after the section 1 (the section adjacent to the regenerant) is permeated, and detecting the wavenumber range of 500-4000cm-1As shown in FIG. 1, it can be seen that the peak value at 500-4000cm-1The value of the wave number penetration spectrum at each wave number is about 5-8%, which reflects that the penetration ratio of the regenerant in the aged asphalt of the section 1 (the section adjacent to the regenerant) is about 5-8%, but two obvious peaks appear in the penetration spectrum, and the two peaks respectively correspond to bending vibration of methyl and methylene and stretching vibration of the methyl and methylene, so that the regenerant contains multiple components, the penetration degree of each component is different, and the penetration degree of small molecular hydrocarbons containing more methyl and methylene is known to be differentThe penetration depth is deeper.
Example two:
and for a certain non-reactive regenerant, in the fifth step, the mass weight ratio of the aged asphalt to the regenerant to the new asphalt is 100:15:100 during sample preparation, the height of the aged asphalt is 5cm, and the aged asphalt is uniformly cut into 5 sections from top to bottom. Temperature lowering curve Ta(t) holding the sample for 2.5 hours until the temperature of the sample is reduced to the set ambient temperature, as obtained by finite element numerical simulation. The peak wave number of the absorption spectrum of a certain functional group is 2919cm-1The number of samples taken from the aged asphalt after penetration from the upper to the lower stages 1 to 5 (stage 1 being the stage adjacent to the regenerant) was calculated to be 2919cm-1The FTIR samples taken from the upper section to the lower section 1-5 are the centers of the samples in each section, the depths are respectively 0.5, 1.5, 2.5, 3.5 and 4.5cm, and the depth penetration spectrum is shown in figure 2, from which it can be seen that the penetration ratio of the regenerant molecules containing the functional groups in the aged asphalts in the sections 1-5 is different, and the deeper the penetration is lower, the penetration in the aged asphalts in the sections 1-5 is reduced from 11.1% to less than 1%.
Example three:
and for a certain non-reactive regenerant, in the fifth step, the mass weight ratio of the aged asphalt to the regenerant to the new asphalt is 100:14:100 during sample preparation, the height of the aged asphalt is 5cm, and the aged asphalt is uniformly cut into 5 sections from top to bottom. Temperature lowering curve Ta(t) from the finite element numerical simulation, it was found that it took 2.5 hours for the sample temperature to drop to the set ambient temperature. The peak wave number of the absorption spectrum of a certain functional group is 2919cm-1Calculating the wave number of a sample taken from the aged asphalt after the penetration of the section 1 (the section 1 is adjacent to the regenerant) to be 2919cm-1Taking the time permeation spectrum S (t) -t curve of each group of samples, the holding time is 0.5, 1.0, 1.5, 2.0 and 2.5 hours respectively, the time permeation spectrum is shown in figure 3, and it can be seen that the permeation proportion of the regenerant molecules containing the functional group in the aged asphalt of the stage 1 is increased along with the increase of time, from 0.5 to 2.5 hours, the permeation amount of the regenerant in the aged asphalt of the stage 1 is increased from 3.8% to 11.1%, and the shape of the increase of the time permeation spectrum curve shows that the regenerant molecules containing the functional group are in the aged asphalt of the stage 1The rate of increase in the penetration ratio in the aged asphalt of stage 1 slowed down with time.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components through other components.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. A non-reactive asphalt regenerant permeability evaluation method is characterized by comprising the following steps: the method comprises the following steps:
firstly, preparing an aged asphalt sample and a regenerant sample, and acquiring infrared spectrums of the aged asphalt sample and the regenerant sample;
secondly, adding a regenerant sample into the aged asphalt sample to obtain a whole-process temperature reduction curve of actual mixing, transportation, paving, compaction and a later stage;
thirdly, preparing a penetration test tube of the aged asphalt and the regenerant;
fourthly, preserving the heat of the test tube in a water bath kettle;
the fifth step, preparing the aging leaching solution after infiltrationA green FTIR sample; scanning the obtained samples by using a Fourier transform infrared absorption spectrometer to obtain the infrared spectrum of each sample, wherein the abscissa of the obtained infrared spectrum is k (cm)-1) The ordinate is the spectral absorbance X (%);
at tqThe water bath is taken out at the end of the time to a depth diThe infrared spectrum absorption rate of the aged asphalt sample after penetrating the regenerant is X after scanning by a Fourier transform infrared absorption spectrometer3(k,di,tq) Wherein, 0<tq≤t2I is any segment from 1 to m;
sixthly, calculating the penetration parameter of the aged asphalt sample after the penetration of the regenerant, and defining the penetration parameter as S (k, d)i,tq) Calculating a wave number penetration spectrum S (k) -k curve, a depth penetration spectrum S (d) -d curve and a time penetration spectrum S (t) -t curve on the basis, and evaluating the penetration performance of the asphalt regenerant;
penetration parameter S (k, d) of aged asphalt sample after penetration of regeneranti,tq) The calculating method comprises the following steps:
for the infrared spectrum absorption value X of the aged asphalt after permeation of the non-reactive regenerant and the regenerant at the wave number k3i(k) Considered as the original aged asphalt absorption value X1(k) With regenerator absorption value X2(k) As a result of linear superposition, i.e.
X3(k,di,tq)＝(1-S(k,di,tq))X1(k)+S(k,di,tq)X2(k) (2)
In the formula (2), S (k) represents the mass fraction of the regenerant in the regenerated aged asphalt at the component corresponding to the wave number k;
the penetration parameter is determined by the formula (2), i.e.
Based on the penetration parameter S (k, d)i,tq) Acquiring a wavenumber penetration spectrum S (k) -k curve for analyzing tqIn the regenerant at the momentA certain depth diThe penetration degree difference of various functional groups in the aged asphalt is as follows:
611 th step, test tube is taken at tqThe water bath is ended at this point, according to the fifth step, the test tube is taken out to a depth diThe infrared spectrum of the sample is detected, and the penetration parameter S (k, d) at different wave numbers k in the infrared spectrum of the sample is calculated according to the formula (3)i,tq) Due to di,tqAre all constant values, the wave number k is variable, so S (k, d)i,tq) It can be abbreviated as S (k);
step 612, drawing S (k) values under different wavenumbers k in a rectangular coordinate system to obtain a wavenumber penetration spectrum S (k) -k curve;
based on the penetration parameter S (k, d)i,tq) Obtaining a depth penetration spectrum S (d) -d curve for analyzing tqThe penetration degree difference of the functional group in the regenerant at different depths in the aged asphalt comprises the following specific steps:
621, taking test tube at tqThe water bath is ended at this point, according to the fifth step, the test tube is taken out to a depth d1—dmRespectively detecting the infrared spectra of the samples, and calculating the wave number k in the infrared spectrum of the sample with the depth d according to the formula (3)aThe permeation parameter of (b) is S (k)a,d,tq) Wherein d is1≤d≤dmDue to ka,tqAll are constant values, and the sample depth d is variable, so S (k)a,d,tq) It can be abbreviated as S (d);
step 622, drawing S (d) values at different depths d in a rectangular coordinate system, wherein d1≤d≤dmObtaining a depth penetration spectrum S (d) -d curve;
based on the penetration parameter S (k, d)i,tq) Acquiring a time permeability spectrum S (t) -t curve for analyzing the difference of the penetration degree of the functional group in the regenerant at different moments in the aged asphalt at a certain depth, wherein the specific method comprises the following steps:
631, taking multiple test tubes at different times t, wherein 0<t≤t2Ending the water bath, according to the fifth step, taking the test tubes to the same depth diRespectively detecting the infrared spectra of the samples, wherein d1≤di≤dmFrom equation (3), the depth d can be calculatediWave number k in infrared spectrum of sampleaPenetration parameter S (k) ofa,diT) in which d1≤di≤dmDue to ka,diAll are constant values, and the end time t of the water bath is variable, so that S (k)a,diT) can be abbreviated as S (t);
632, drawing the S (t) values under different water bath time t in a rectangular coordinate system, wherein 0<t≤t2And obtaining a depth penetration spectrum S (t) -t curve.
2. The method for evaluating the permeability of the non-reactive asphalt recycling agent according to claim 1, wherein: in the first step, Fourier transform infrared absorption spectrometer scanning is applied to the aged asphalt sample and the regenerant sample to obtain infrared spectrums of the aged asphalt sample and the regenerant sample with wave numbers between k1 and k2, wherein the infrared spectrum absorption rate of the aged asphalt sample is recorded as X1(k) The infrared spectral absorption of the regenerant sample is recorded as X2(k)。
3. The method for evaluating the permeability of the non-reactive asphalt recycling agent according to claim 1, wherein: in the second step, adding a regenerant sample into the aged asphalt sample, and stirring, wherein the stirring temperature is set to be T in the stirring process0Setting the whole-course temperature-reducing curve as T when the temperature in the transportation, paving, compacting and later stages is reduced along with the increase of timea(t)；
Wherein, the mixing completion time is defined as t00, i.e. the cooling curve satisfies Ta(t0)＝T0Timing to t1When the temperature of the asphalt mixture is reduced to the site environment temperature of T1I.e. the cooling curve satisfies Ta(t1)＝T1Simulation of obtaining t in actual thermal regeneration0To t1Whole section cooling curve T betweena(t)。
4. The method for evaluating the permeability of the non-reactive asphalt recycling agent according to claim 1, wherein: in the third step, a test tube with the diameter D is taken, aged asphalt, regenerant and new asphalt are injected from the bottom to the top of the test tube in sequence, and the temperature is preheated to T when the aged asphalt, the regenerant and the new asphalt are injected0。
5. The method for evaluating the permeability of the non-reactive asphalt recycling agent according to claim 4, wherein: in the fourth step, vertically arrange the test tube in the water bath, the test tube mouth is opened, according to the whole section cooling curve T that obtains in the second stepa(t) reducing the temperature of the silicone oil in the water bath;
when the time is t1While the temperature of the silicone oil is reduced to T1Then keeping the temperature of the silicone oil in the water bath at T1Keeping constant, keeping the temperature until the moment is t2Stopping heat preservation, namely the temperature T (t) of the silicon oil in the water bath kettle meets the following formula:
6. the method for evaluating the permeability of the non-reactive asphalt recycling agent according to claim 5, wherein: in the fifth step, the specific process for preparing the FTIR sample of the aged asphalt after infiltration is as follows:
at the 51 st step, at the time tqTaking out the test tube, placing the test tube in flowing cold water, rapidly cooling to room temperature, breaking the test tube after the aged asphalt section is solidified and molded, removing the new asphalt and regenerant section, taking out the aged asphalt section, cleaning the aged asphalt section with clear water, and wiping the aged asphalt section to dry;
step 52, averagely cutting the aged asphalt section into m sections, wherein the part positioned in the test tube and next to the regenerant section is marked as a section 1, and the part positioned at the bottom in the test tube is marked as an mth section;
step 53, taking the central part of each section of m sections to prepare a sample, and defining the depth of the sampling center as d1—dmWherein the depth of the contact surface of the aged asphalt and the regenerant is defined as 0.
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