CN113008738A - Determination method for short-term aging test parameters of SBS (styrene butadiene styrene) modified asphalt - Google Patents
Determination method for short-term aging test parameters of SBS (styrene butadiene styrene) modified asphalt Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 262
- 230000032683 aging Effects 0.000 title claims abstract description 175
- 238000012360 testing method Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 51
- FACXGONDLDSNOE-UHFFFAOYSA-N buta-1,3-diene;styrene Chemical compound C=CC=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 FACXGONDLDSNOE-UHFFFAOYSA-N 0.000 title description 172
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 title description 172
- 230000035515 penetration Effects 0.000 claims abstract description 66
- 239000000203 mixture Substances 0.000 claims abstract description 59
- 238000010276 construction Methods 0.000 claims abstract description 20
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 238000004821 distillation Methods 0.000 claims description 54
- 238000010438 heat treatment Methods 0.000 claims description 46
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 38
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims description 38
- 238000001514 detection method Methods 0.000 claims description 20
- 238000005273 aeration Methods 0.000 claims description 19
- 238000011084 recovery Methods 0.000 claims description 18
- 238000013022 venting Methods 0.000 claims description 12
- 238000005119 centrifugation Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 11
- 238000000605 extraction Methods 0.000 claims description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 7
- 239000011707 mineral Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 230000001133 acceleration Effects 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000004088 simulation Methods 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 27
- 239000010408 film Substances 0.000 description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000010998 test method Methods 0.000 description 6
- 239000002904 solvent Substances 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000036314 physical performance Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000012465 retentate Substances 0.000 description 1
- 238000012546 transfer 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
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/12—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring rising or falling speed of the body; by measuring penetration of wedged gauges
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Abstract
The invention particularly relates to a method for determining short-term aging test parameters of SBS modified asphalt, which solves the problem that the aging degree of indoor short-term aging simulation does not have correlation with the field aging degree when the existing short-term aging test parameters are applied to the determination of SBS modified asphalt. A method for determining short-term aging test parameters of SBS modified asphalt comprises the following steps of S1: sampling SBS modified asphalt; s2: indoor aging of the original sample; s3: measuring original penetration and residual penetration; s4: establishing a non-linear aging equation of SBS modified asphalt; s5: sampling the SBS modified asphalt mixture; s6: recycling SBS modified asphalt from SBS modified asphalt mixture; s7: measuring the penetration of the recycled SBS modified asphalt; s8: and (4) determining short-term aging test parameters of the SBS modified asphalt. The method provided by the invention furthest simulates the site construction conditions of the SBS modified asphalt mixture, and the short-term aging test parameters of the SBS modified asphalt determined by the method can be used for accurately evaluating the short-term aging performance of the SBS modified asphalt.
Description
Technical Field
The invention relates to a method for determining parameters for road engineering, in particular to a method for determining short-term aging test parameters of SBS modified asphalt.
Background
In road engineering, the aging process of the asphalt on the road surface can be divided into aging in the processes of mixing, transporting, paving and rolling of a mixture and aging in the using process of the road surface, and the short-term aging of the asphalt can be considered to be completed when the paving and rolling of the asphalt are completed. In the current road engineering asphalt and asphalt mixture test regulation (JTG E20-2001) in China, an asphalt film heating test (T0609-. Wherein, test parameters such as test temperature, aging time and the like of short-term aging are provided based on the temperature and time of the common asphalt mixture in the conventional production process.
However, practice shows that the existing short-term aging test parameters have the following problems when applied to the determination of SBS modified asphalt: because the components, production and construction processes of the SBS modified asphalt are greatly different from those of common asphalt, and the temperature of construction links such as mixing, paving and rolling of the SBS modified asphalt mixture is far higher than that of the common asphalt mixture, if the short-term aging test method provided based on the construction conditions of the common asphalt mixture is obviously inconsistent with the field construction conditions of the modified asphalt, the aging degree of the SBS modified asphalt simulated by indoor short-term aging is inevitably not related to the field, so that misjudgment of the aging degree of the road surface modified asphalt can be caused, and even the design error of the durability of the road surface can be caused. Therefore, a method for determining short-term aging test parameters of SBS modified asphalt is needed, the method is used for determining the short-term aging test parameters suitable for specific SBS modified asphalt, the aging resistance of SBS modified asphalt is accurately evaluated by using the test parameters, the aging condition of modified asphalt pavement is known in time, and a basis is provided for making a decision scheme for maintaining asphalt pavement.
Disclosure of Invention
The invention provides a method for determining short-term aging test parameters of SBS modified asphalt, aiming at solving the problem that the aging degree simulated by indoor short-term aging when the existing short-term aging test parameters are applied to the determination of SBS modified asphalt has no correlation with the field aging degree.
The invention is realized by adopting the following technical scheme:
a method for determining short-term aging test parameters of SBS modified asphalt is realized by the following steps:
s1: sampling SBS modified asphalt: taking an SBS modified asphalt sample from a construction site to obtain an original sample;
s2: indoor aging as received: preparing seven detection samples by using the original sample obtained in the step S1, and putting each detection sample into a film heating oven for film heating test to obtain residues after the films are heated, wherein the test temperatures of the seven detection samples are all 180 ℃, and the aging times t of the seven detection samples are respectively 85min, 180min, 270min, 300min, 360min, 450min and 540 min;
s3: determination of the needle penetration as received and of the residue: measuring the penetration P0And the penetration P of each residue in step S2i，i＝1，……，7；
S4: establishing a non-linear aging equation of SBS modified asphalt: aging time t in step S2iThe needle penetration P measured in step S30Penetration P of residueiSubstituting the following formula, i is 1, … …, 7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the aging time t is expressed in min, and the penetration P is0Penetration P of residueiThe units of (A) are all 0.1 mm;
obtaining constants r and L, thereby obtaining a SBS modified asphalt nonlinear aging equation;
s5: sampling of the SBS modified asphalt mixture: taking the SBS modified asphalt mixture which is mixed and rolled from a construction site;
s6: the SBS modified asphalt is recovered from the SBS modified asphalt mixture, and the recovery process is realized by adopting the following steps:
a) dissolving the SBS modified asphalt mixture by using trichloroethylene, wherein the addition amount of the trichloroethylene is proper to be enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 12-20 h, so as to obtain a trichloroethylene solution of the SBS modified asphalt;
b) centrifuging the trichloroethylene solution of the SBS modified asphalt by using a centrifugal extractor, applying a relative centrifugal acceleration of 7000G during centrifugation, wherein the centrifugation time is more than or equal to 30min, so as to remove mineral powder in the trichloroethylene solution of the SBS modified asphalt and obtain an extraction solution;
c) pouring the extract into a clean distillation flask, cleaning an extract container by using a small amount of trichloroethylene, pouring the cleaning solution into the distillation flask, and adding 20 glass beads with the particle size of 3mm into the distillation flask; finally, connecting the distillation flask to an Abonsen method distillation device;
d) heating the distillation flask, and adjusting the heating temperature of the oil bath heater when the extracting solution begins to boil so as to keep the distillation recovery speed of the extracting solution at 6ml/min-10 ml/min; when the temperature of the extractive solution reaches 135 deg.C, the vent valve is opened, and CO is introduced downwards2Venting to CO2The vent pipe is contacted with the bottom of the bottle, and then CO is regulated2Vent valve, control of CO2The aeration rate is 180ml/min-220 ml/min;
e) when the temperature of the extracting solution reaches 157-160 ℃, adjusting CO2Venting valve to make CO2The aeration rate is increased to 1550ml/min-1650 ml/min; simultaneously adjusting the heating temperature of the oil bath heaterThe temperature of the extracting solution is kept between 160 and 166 ℃, and the temperature of the extracting solution is kept between 160 and 166 ℃;
f) when no droplet is dropped in the condenser tube, CO is retained2Keeping the aeration rate and the heating temperature unchanged, and continuously introducing CO2Gas is used for 40min to remove liquid drops attached to the inner wall of the distillation flask; then stopping introducing CO2Stopping heating, and pouring out the recovered SBS modified asphalt in the distillation flask when the gas is hot, thereby obtaining the recovered SBS modified asphalt;
s7: and (3) measuring the penetration of the recycled SBS modified asphalt: determination of needle penetration P of recycled SBS modified asphaltt；
S8: determining short-term aging test parameters of SBS modified asphalt: the penetration P of the recycled SBS modified asphalt obtained in the step S7 is measuredtSubstituting the aging time T into the SBS modified asphalt nonlinear aging equation established in the step S4 to calculate and obtain the aging time T of the recycled SBS modified asphalt, wherein the aging time T is the short-term aging test parameter of the SBS modified asphalt.
In the invention, the sampling method of SBS modified asphalt in the step S1 is executed by referring to the T0601-2011 asphalt sampling method in road engineering asphalt and asphalt mixture test specification (JTG E20-2011); the operation method of the thin film heating test in the step S2, the method for measuring the penetration in the steps S3 and S7 are executed by referring to the test specification of asphalt and asphalt mixture for road engineering (JTG E20-2011); the sampling method of the SBS modified asphalt mixture in the step 5 is executed according to a T0701-2011 asphalt mixture sampling method in road engineering asphalt and asphalt mixture test procedures (JTG E20-2011); the connection mode and requirement of the distillation unit of the Abelson method in the step S6 are executed by referring to a method (the Abelson method) for recovering asphalt from an asphalt mixture by T0726-.
The invention selects penetration index to establish SBS modified asphalt nonlinear aging equation, the selection reason is as follows: generally, the physical performance indexes and aging conditions of penetration and ductility road performance of SBS modified asphalt have good regularity, and considering that ductility asphalt is large in use amount, the workload of asphalt extraction and recovery tests is increased, and the manual operation error is increased. Therefore, the penetration degree is selected as an index to establish the SBS modified asphalt nonlinear aging equation, and the accuracy of the SBS modified asphalt short-term aging test parameters determined by the method is further improved.
In the invention, the test conditions and steps for recycling SBS modified asphalt are optimized, and one of the steps is as follows: because the dissolving speed of the SBS modified asphalt is slower than that of the common asphalt, the invention prolongs the dissolving time of the SBS modified asphalt mixture, ensures that the SBS modified asphalt can be completely dissolved, and improves the recovery rate of the recovered SBS modified asphalt; secondly, the centrifugal extraction conditions of the trichloroethylene solution of the SBS modified asphalt are optimized, so that the mineral powder can be completely separated and removed; thirdly, to CO in the distillation process2The control process of the aeration rate and the heating temperature is optimized, the recovery effect of the recovered SBS modified asphalt is improved, the accuracy of the aging time T calculated by the recovered SBS modified asphalt is improved, and the accuracy of the short-term aging test parameters of the SBS modified asphalt determined by the method is improved.
In step S8, after the aging time T of the recycled SBS modified asphalt is obtained through calculation, the aging time T is subjected to nearest rounding processing to obtain rounded aging time T1Wherein, the rounding principle is as follows: t is10.5N, N is a positive integer greater than 1, and | T1-T|≤0.25；T、T1The unit of (A) is h; the rounded aging time T1Namely the parameters of the short-term aging test of the SBS modified asphalt.
The rounding treatment facilitates the standardized operation of the short-term aging test of the SBS modified asphalt.
Step S5, step S6, step S7, and step S8 are all provided with eight sets of parallel samples; aging time T of recovered SBS modified asphalt of eight groups of parallel samples in step S8iTaking an average to obtain
1, … …, 8; the average value
Namely the aging time T of the recycled SBS modified asphalt.
The accuracy of the SBS modified asphalt short-term aging test parameters determined by the method is improved by the eight groups of parallel samples, and the influence of the recovery test operation errors on the accuracy of the SBS modified asphalt short-term aging test parameters is reduced.
In step S6, the method of dissolving the SBS modified asphalt mixture with trichloroethylene by stirring at normal temperature.
The invention provides a method for determining short-term aging test parameters of SBS modified asphalt, which simulates the site construction conditions of SBS modified asphalt mixture to the maximum extent, solves the problem that the aging degree and the site aging degree of the indoor short-term aging simulation of the existing short-term aging test parameters are not correlated when the existing short-term aging test parameters are applied to the determination of SBS modified asphalt, can accurately evaluate the short-term aging performance of SBS modified asphalt, timely knows the aging condition of modified asphalt pavement, and provides basis for the formulation of an asphalt pavement maintenance decision scheme.
Detailed Description
Example 1
A method for determining short-term aging test parameters of SBS modified asphalt is realized by the following steps:
s1: sampling SBS modified asphalt: taking an SBS modified asphalt sample from a construction site to obtain an original sample;
s2: indoor aging as received: preparing seven detection samples by using the original sample obtained in the step S1, and putting each detection sample into a film heating oven for film heating test to obtain residues after the films are heated, wherein the test temperatures of the seven detection samples are all 180 ℃, and the aging times t of the seven detection samples are respectively 85min, 180min, 270min, 300min, 360min, 450min and 540 min;
s3: determination of the needle penetration as received and of the residue: measuring the penetration P0And the penetration P of each residue in step S2i，i＝1，……，7；
S4: establishing a non-linear aging equation of SBS modified asphalt: aging time t in step S2iThe needle penetration P measured in step S30And the residuePenetration P of the retentateiSubstituting the following formula, i is 1, … …, 7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the aging time t is expressed in min, and the penetration P is0Penetration P of residueiThe units of (A) are all 0.1 mm;
obtaining constants r and L, thereby obtaining a SBS modified asphalt nonlinear aging equation;
s5: sampling of the SBS modified asphalt mixture: taking the SBS modified asphalt mixture which is mixed and rolled from a construction site;
s6: the SBS modified asphalt is recovered from the SBS modified asphalt mixture, and the recovery process is realized by adopting the following steps:
a) dissolving the SBS modified asphalt mixture by using trichloroethylene, wherein the dissolving mode is that the mixture is stirred and dissolved at normal temperature, the adding amount of the trichloroethylene is proper to be enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 12 hours, so that a trichloroethylene solution of the SBS modified asphalt is obtained;
b) centrifuging the trichloroethylene solution of the SBS modified asphalt by using a centrifugal extractor, applying a relative centrifugal acceleration of 7000G during centrifugation, wherein the centrifugation time is 30min, so as to remove mineral powder in the trichloroethylene solution of the SBS modified asphalt and obtain an extraction solution;
c) pouring the extract into a clean distillation flask, cleaning an extract container by using a small amount of trichloroethylene, pouring the cleaning solution into the distillation flask, and adding 20 glass beads with the particle size of 3mm into the distillation flask; finally, connecting the distillation flask to an Abonsen method distillation device;
d) heating the distillation flask, and when the extracting solution begins to boil, adjusting the heating temperature of the oil bath heater to keep the distillation recovery speed of the extracting solution at 6 ml/min; when the temperature of the extractive solution reaches 135 deg.C, the vent valve is opened, and CO is introduced downwards2Venting to CO2The vent pipe is contacted with the bottom of the bottle, and then CO is regulated2Vent valve, control of CO2The aeration rate is 180 ml/min;
e) when the temperature of the extract reached 157 c,CO regulation2Venting valve to make CO2The aeration rate was increased to 1550 ml/min; simultaneously adjusting the heating temperature of the oil bath heater to 160 ℃ to keep the temperature of the extracting solution at 160 ℃;
f) when no droplet is dropped in the condenser tube, CO is retained2Keeping the aeration rate and the heating temperature unchanged, and continuously introducing CO2Gas is used for 40min to remove liquid drops attached to the inner wall of the distillation flask; then stopping introducing CO2Stopping heating, and pouring out the recovered SBS modified asphalt in the distillation flask when the gas is hot, thereby obtaining the recovered SBS modified asphalt;
s7: and (3) measuring the penetration of the recycled SBS modified asphalt: determination of needle penetration P of recycled SBS modified asphaltt；
S8: determining short-term aging test parameters of SBS modified asphalt: firstly, the penetration P of the recycled SBS modified asphalt measured in the step S7tSubstituting the aging time T into the non-linear aging equation of the SBS modified asphalt established in the step S4 to calculate and obtain the aging time T of the recycled SBS modified asphalt; then, the aging time T is subjected to the nearby rounding treatment to obtain the rounded aging time T1Wherein, the rounding principle is as follows: t is10.5N, N is a positive integer greater than 1, and | T1-T|≤0.25；T、T1The unit of (A) is h; the rounded aging time T1Namely the parameters of the short-term aging test of the SBS modified asphalt.
Step S5, step S6, step S7, and step S8 are all provided with eight sets of parallel samples; aging time T of recovered SBS modified asphalt of eight groups of parallel samples in step S8iTaking an average to obtain
1, … …, 8; the average value
Namely the aging time T of the recycled SBS modified asphalt.
Example 2
A method for determining short-term aging test parameters of SBS modified asphalt is realized by the following steps:
s1: sampling SBS modified asphalt: taking an SBS modified asphalt sample from a construction site to obtain an original sample;
s2: indoor aging as received: preparing seven detection samples by using the original sample obtained in the step S1, and putting each detection sample into a film heating oven for film heating test to obtain residues after the films are heated, wherein the test temperatures of the seven detection samples are all 180 ℃, and the aging times t of the seven detection samples are respectively 85min, 180min, 270min, 300min, 360min, 450min and 540 min;
s3: determination of the needle penetration as received and of the residue: measuring the penetration P0And the penetration P of each residue in step S2i，i＝1，……，7；
S4: establishing a non-linear aging equation of SBS modified asphalt: aging time t in step S2iThe needle penetration P measured in step S30Penetration P of residueiSubstituting the following formula, i is 1, … …, 7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the aging time t is expressed in min, and the penetration P is0Penetration P of residueiThe units of (A) are all 0.1 mm;
obtaining constants r and L, thereby obtaining a SBS modified asphalt nonlinear aging equation;
s5: sampling of the SBS modified asphalt mixture: taking the SBS modified asphalt mixture which is mixed and rolled from a construction site;
s6: the SBS modified asphalt is recovered from the SBS modified asphalt mixture, and the recovery process is realized by adopting the following steps:
a) dissolving the SBS modified asphalt mixture by using trichloroethylene, wherein the dissolving mode is that the mixture is stirred and dissolved at normal temperature, the adding amount of the trichloroethylene is proper to be enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 20 hours, so that a trichloroethylene solution of the SBS modified asphalt is obtained;
b) centrifuging the trichloroethylene solution of the SBS modified asphalt by using a centrifugal extractor, applying a relative centrifugal acceleration of 7000G during centrifugation for 45min, and thus removing mineral powder in the trichloroethylene solution of the SBS modified asphalt to obtain an extraction solution;
c) pouring the extract into a clean distillation flask, cleaning an extract container by using a small amount of trichloroethylene, pouring the cleaning solution into the distillation flask, and adding 20 glass beads with the particle size of 3mm into the distillation flask; finally, connecting the distillation flask to an Abonsen method distillation device;
d) heating the distillation flask, and when the extracting solution begins to boil, adjusting the heating temperature of the oil bath heater to keep the distillation recovery speed of the extracting solution at 10 ml/min; when the temperature of the extractive solution reaches 135 deg.C, the vent valve is opened, and CO is introduced downwards2Venting to CO2The vent pipe is contacted with the bottom of the bottle, and then CO is regulated2Vent valve, control of CO2The aeration rate was 220 ml/min;
e) adjusting CO when the temperature of the extractive solution reaches 160 deg.C2Venting valve to make CO2The aeration rate was increased to 1650 ml/min; simultaneously adjusting the heating temperature of the oil bath heater to 166 ℃ to keep the temperature of the extracting solution at 166 ℃;
f) when no droplet is dropped in the condenser tube, CO is retained2Keeping the aeration rate and the heating temperature unchanged, and continuously introducing CO2Gas is used for 40min to remove liquid drops attached to the inner wall of the distillation flask; then stopping introducing CO2Stopping heating, and pouring out the recovered SBS modified asphalt in the distillation flask when the gas is hot, thereby obtaining the recovered SBS modified asphalt;
s7: and (3) measuring the penetration of the recycled SBS modified asphalt: determination of needle penetration P of recycled SBS modified asphaltt；
S8: determining short-term aging test parameters of SBS modified asphalt: firstly, the penetration P of the recycled SBS modified asphalt measured in the step S7tSubstituting the aging time T into the non-linear aging equation of the SBS modified asphalt established in the step S4 to calculate and obtain the aging time T of the recycled SBS modified asphalt; then, the aging time T is subjected to the nearby rounding treatment to obtain the rounded aging time T1Wherein, the rounding principle is as follows: t is10.5N, N is a positive integer greater than 1, and | T1-T|≤0.25；T、T1The unit of (A) is h; the rounded aging time T1Namely the parameters of the short-term aging test of the SBS modified asphalt.
Step S5, step S6, step S7, and step S8 are all provided with eight sets of parallel samples; aging time T of recovered SBS modified asphalt of eight groups of parallel samples in step S8iTaking an average to obtain
1, … …, 8; the average value
Namely the aging time T of the recycled SBS modified asphalt.
Example 3
A method for determining short-term aging test parameters of SBS modified asphalt is realized by the following steps:
s1: sampling SBS modified asphalt: taking an SBS modified asphalt sample from a construction site to obtain an original sample;
s2: indoor aging as received: preparing seven detection samples by using the original sample obtained in the step S1, and putting each detection sample into a film heating oven for film heating test to obtain residues after the films are heated, wherein the test temperatures of the seven detection samples are all 180 ℃, and the aging times t of the seven detection samples are respectively 85min, 180min, 270min, 300min, 360min, 450min and 540 min;
s3: determination of the needle penetration as received and of the residue: measuring the penetration P0And the penetration P of each residue in step S2i，i＝1，……，7；
S4: establishing a non-linear aging equation of SBS modified asphalt: aging time t in step S2iThe needle penetration P measured in step S30Penetration P of residueiSubstituting the following formula, i is 1, … …, 7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the aging time t is expressed in min, and the penetration P is0And residues thereofPenetration degree PiThe units of (A) are all 0.1 mm;
obtaining constants r and L, thereby obtaining a SBS modified asphalt nonlinear aging equation;
s5: sampling of the SBS modified asphalt mixture: taking the SBS modified asphalt mixture which is mixed and rolled from a construction site;
s6: the SBS modified asphalt is recovered from the SBS modified asphalt mixture, and the recovery process is realized by adopting the following steps:
a) dissolving the SBS modified asphalt mixture by using trichloroethylene, wherein the dissolving mode is that the mixture is stirred and dissolved at normal temperature, the adding amount of the trichloroethylene is proper to be enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 15 hours, so that a trichloroethylene solution of the SBS modified asphalt is obtained;
b) centrifuging the trichloroethylene solution of the SBS modified asphalt by using a centrifugal extractor, applying a relative centrifugal acceleration of 7000G during centrifugation, wherein the centrifugation time is 35min, so as to remove mineral powder in the trichloroethylene solution of the SBS modified asphalt and obtain an extraction solution;
c) pouring the extract into a clean distillation flask, cleaning an extract container by using a small amount of trichloroethylene, pouring the cleaning solution into the distillation flask, and adding 20 glass beads with the particle size of 3mm into the distillation flask; finally, connecting the distillation flask to an Abonsen method distillation device;
d) heating the distillation flask, and when the extracting solution begins to boil, adjusting the heating temperature of the oil bath heater to keep the distillation recovery speed of the extracting solution at 7 ml/min; when the temperature of the extractive solution reaches 135 deg.C, the vent valve is opened, and CO is introduced downwards2Venting to CO2The vent pipe is contacted with the bottom of the bottle, and then CO is regulated2Vent valve, control of CO2The aeration rate was 195 ml/min;
e) adjusting CO when the temperature of the extractive solution reaches 158 deg.C2Venting valve to make CO2The aeration rate is increased to 1580 ml/min; simultaneously adjusting the heating temperature of the oil bath heater to 162 ℃ to keep the temperature of the extracting solution at 162 ℃;
f) when no droplet is dropped in the condenser tube, CO is retained2Keeping the aeration rate and the heating temperature unchanged, and continuously introducing CO2Gas is used for 40min to remove liquid drops attached to the inner wall of the distillation flask; then stopping introducing CO2Stopping heating, and pouring out the recovered SBS modified asphalt in the distillation flask when the gas is hot, thereby obtaining the recovered SBS modified asphalt;
s7: and (3) measuring the penetration of the recycled SBS modified asphalt: determination of needle penetration P of recycled SBS modified asphaltt；
S8: determining short-term aging test parameters of SBS modified asphalt: firstly, the penetration P of the recycled SBS modified asphalt measured in the step S7tSubstituting the aging time T into the non-linear aging equation of the SBS modified asphalt established in the step S4 to calculate and obtain the aging time T of the recycled SBS modified asphalt; then, the aging time T is subjected to the nearby rounding treatment to obtain the rounded aging time T1Wherein, the rounding principle is as follows: t is10.5N, N is a positive integer greater than 1, and | T1-T|≤0.25；T、T1The unit of (A) is h; the rounded aging time T1Namely the parameters of the short-term aging test of the SBS modified asphalt.
Step S5, step S6, step S7, and step S8 are all provided with eight sets of parallel samples; aging time T of recovered SBS modified asphalt of eight groups of parallel samples in step S8iTaking an average to obtain
1, … …, 8; the average value
Namely the aging time T of the recycled SBS modified asphalt.
Example 4
A method for determining short-term aging test parameters of SBS modified asphalt is realized by the following steps:
s1: selecting a shell brand SBS (styrene butadiene styrene) finished product modified asphalt for a certain highway construction site, and carrying out TFOT (thermal energy transfer) aging on the selected modified asphalt according to the requirements of an asphalt film heating test (T0609-2011) in highway engineering asphalt and asphalt mixture test procedures (JTGE20-2011), wherein the test temperature is 180 ℃, and the aging test time is 85min, 180min, 270min, 360min, 450min and 540min respectively. Then, the performance tests of the penetration degree at 25 ℃, the ductility at 5 ℃ and the softening point are carried out, and the test results are shown in table 1:
TABLE 1 Performance indicators before and after aging of SBS modified asphalt under different aging conditions in example 4
As can be seen from Table 1, the physical performance indexes of the SBS modified asphalt, such as penetration, ductility and the like, of the pavement performance and the aging conditions have good regularity, and the softening point is influenced by SBS content, the self-property of the matrix asphalt, compatibility and the like, so that the change regularity is not uniform. Considering that the ductility asphalt has larger consumption, the workload of asphalt extraction back to the test is increased, and the manual operation error is increased. Therefore, the penetration is selected as an index to establish a non-linear simulation equation of the SBS modified asphalt binder.
S2: establishing a non-linear aging equation of SBS modified asphalt: aging time t in step S1iOriginal penetration P0Penetration P of residueiSubstituting the following formula, i is 1, … …, 7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the aging time t is expressed in min, and the penetration P is0Penetration P of residueiThe units of (A) are all 0.1 mm;
the constant r-0.00145 and L-1.77 were obtained, and the nonlinear aging equation was obtained as follows:
P(t)＝103.899/(1+0.77e0.00145t)
s3: sampling of the SBS modified asphalt mixture: taking the SBS modified asphalt mixture which is mixed and rolled from a construction site;
s4: the SBS modified asphalt is recovered from the SBS modified asphalt mixture, and the recovery process is realized by adopting the following steps:
a) dissolving the SBS modified asphalt mixture by using trichloroethylene, wherein the dissolving mode is that the mixture is stirred and dissolved at normal temperature, the adding amount of the trichloroethylene is proper to be enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 18 hours, so that a trichloroethylene solution of the SBS modified asphalt is obtained;
b) centrifuging the trichloroethylene solution of the SBS modified asphalt by using a centrifugal extractor, applying a relative centrifugal acceleration of 7000G during centrifugation, wherein the centrifugation time is 41min, so as to remove mineral powder in the trichloroethylene solution of the SBS modified asphalt and obtain an extraction solution;
c) firstly, pouring 400ml of extract into a clean 500ml distillation flask, cleaning the extract by using a small amount of solvent, pouring the extract into the flask together, putting 20 glass beads with the particle size of 3mm, preventing bumping in the later heating process, and connecting an Abelson recovery device according to the requirements of T0726-2011 in road engineering asphalt and asphalt mixture test procedures (JTG E20-2001);
d) heating the flask, boiling and evaporating the solution when the temperature reaches 88-92 ℃, and adjusting the heating temperature of an oil bath heater to keep the distillation recovery speed of the extracting solution at 9 ml/min; when the temperature of the extractive solution reaches 135 deg.C, the vent valve is opened, and CO is introduced downwards2Venting to CO2The vent pipe is contacted with the bottom of the bottle, and then CO is regulated2Vent valve, control of CO2The aeration rate was 205 ml/min;
e) adjusting CO when the temperature of the extractive solution reaches 159 deg.C2Venting valve to make CO2The aeration rate is increased to 1600 ml/min; meanwhile, controlling the heating temperature of the oil bath to keep the temperature of the solution at 164 ℃; keeping the aeration rate of carbon dioxide unchanged, continuously heating for 15min, continuously blowing carbon dioxide for 40min after the solvent dropping in a condenser or the solvent vapor dropping attached to the inner wall of the upper part of the distillation flask stops dropping, and removing the solvent vapor on the inner wall of the distillation flask. During the process, the heating temperature is kept unchanged;
f) and stopping introducing carbon dioxide and heating when the distillation is finished, pouring the recovered SBS modified asphalt in the distillation flask into a container while the distillation flask is hot, and testing the penetration degree of the recovered SBS modified asphalt.
TABLE 2 penetration and penetration as received of SBS modified asphalt extracted and recovered in example 4
S5: and (3) respectively substituting the data in the table 2 in the step S4 into the nonlinear aging equation in the step S2 to obtain the aging time of the recycled SBS modified asphalt as follows: 537.14min, 520.17min, 562.80min, 545.66min, 522.99min, 537.14min, 517.35min and 539.98 min; averaging the aging time of the recovered SBS modified asphalt of the eight groups of parallel samples, and calculating to obtain 535.40 min; the average value of 535.40min is the aging time T of the recycled SBS modified asphalt; in order to facilitate the control of the test time, the recommended indoor aging test conditions of the SBS modified asphalt binder are as follows: placing in an indoor film oven at 180 deg.C for 540 min.
S6: selecting the SBS modified asphalt on the construction site as it is to perform an indoor Thin Film Oven (TFOT) aging test, wherein the test conditions are selected from the test conditions determined in the step S5: placing the mixture in an indoor film oven for 540min at 180 ℃, detecting the penetration index of the aged SBS modified asphalt, and comparing the penetration index with the penetration index of the recycled asphalt, wherein the test result is shown in Table 3.
TABLE 3 short term aging method verification test results
| Asphalt sampling number | Aging temperature (. degree.C.) | Aging time (min) | Penetration after aging | Penetration of recycled asphalt |
| 1 | 180 | 540 | 39.9 | 38.8 |
| 2 | 180 | 540 | 40.2 | 39.4 |
| 3 | 180 | 540 | 36.5 | 37.9 |
| 4 | 180 | 540 | 38.2 | 38.5 |
| 5 | 180 | 540 | 38.8 | 39.3 |
| 6 | 180 | 540 | 39.3 | 38.8 |
As can be seen from Table 3, the penetration value after aging was very close to the residual penetration of the recycled asphalt when the film oven was left at 180 ℃ for 540 min. The allowable error of the penetration repeatability test is less than or equal to 2, and the penetration difference between the result of the verification test and the recycled asphalt is within 2 according to the regulations in highway engineering asphalt and asphalt mixture test procedures. Considering the self errors of penetration test and extraction recovery test, the aging degree of the modified asphalt aged by adopting the SBS modified asphalt short-term aging test method is equivalent to the short-term aging degree in the asphalt construction process.
S7: selecting an SBS modified asphalt sample to be evaluated, and carrying out short-term aging test according to the test steps in road engineering asphalt and asphalt mixture test protocol (JTG E20-2011), wherein the test conditions are as follows: the aging temperature is 180 ℃, and the aging time is 540 min. After aging, the change in properties such as penetration, ductility, softening point, viscosity, etc. of the residue after short-term aging was measured and the test results are shown in table 4.
TABLE 4 short term aging test results
Claims (4)
1. A method for determining short-term aging test parameters of SBS modified asphalt is characterized by comprising the following steps: the method is realized by the following steps:
s1: sampling SBS modified asphalt: taking an SBS modified asphalt sample from a construction site to obtain an original sample;
s2: indoor aging as received: preparing seven detection samples by using the original sample obtained in the step S1, and putting each detection sample into a film heating oven for film heating test to obtain residues after the films are heated, wherein the test temperatures of the seven detection samples are all 180 ℃, and the aging times t of the seven detection samples are respectively 85min, 180min, 270min, 300min, 360min, 450min and 540 min;
s3: determination of the needle penetration as received and of the residue: measuring the penetration P0And the penetration P of each residue in step S2i，i＝1，……，7；
S4: establishing a non-linear aging equation of SBS modified asphalt: aging time t in step S2iThe needle penetration P measured in step S30Penetration P of residueiSubstituting the following formula, i is 1, … …, 7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the aging time t is expressed in min, and the penetration P is0Penetration P of residueiThe units of (A) are all 0.1 mm;
obtaining constants r and L, thereby obtaining a SBS modified asphalt nonlinear aging equation;
s5: sampling of the SBS modified asphalt mixture: taking the SBS modified asphalt mixture which is mixed and rolled from a construction site;
s6: the SBS modified asphalt is recovered from the SBS modified asphalt mixture, and the recovery process is realized by adopting the following steps:
a) dissolving the SBS modified asphalt mixture by using trichloroethylene, wherein the addition amount of the trichloroethylene is proper to be enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 12-20 h, so as to obtain a trichloroethylene solution of the SBS modified asphalt;
b) centrifuging the trichloroethylene solution of the SBS modified asphalt by using a centrifugal extractor, applying a relative centrifugal acceleration of 7000G during centrifugation, wherein the centrifugation time is more than or equal to 30min, so as to remove mineral powder in the trichloroethylene solution of the SBS modified asphalt and obtain an extraction solution;
c) pouring the extract into a clean distillation flask, cleaning an extract container by using a small amount of trichloroethylene, pouring the cleaning solution into the distillation flask, and adding 20 glass beads with the particle size of 3mm into the distillation flask; finally, connecting the distillation flask to an Abonsen method distillation device;
d) heating the distillation flask, and adjusting the heating temperature of the oil bath heater when the extracting solution begins to boil so as to keep the distillation recovery speed of the extracting solution at 6ml/min-10 ml/min; when the temperature of the extractive solution reaches 135 deg.C, the vent valve is opened, and CO is introduced downwards2Venting to CO2The vent pipe is contacted with the bottom of the bottle and then adjustedSave CO2Vent valve, control of CO2The aeration rate is 180ml/min-220 ml/min;
e) when the temperature of the extracting solution reaches 157-160 ℃, adjusting CO2Venting valve to make CO2The aeration rate is increased to 1550ml/min-1650 ml/min; meanwhile, the heating temperature of the oil bath heater is adjusted to be 160-166 ℃, so that the temperature of the extracting solution is kept at 160-166 ℃;
f) when no droplet is dropped in the condenser tube, CO is retained2Keeping the aeration rate and the heating temperature unchanged, and continuously introducing CO2Gas is used for 40min to remove liquid drops attached to the inner wall of the distillation flask; then stopping introducing CO2Stopping heating, and pouring out the recovered SBS modified asphalt in the distillation flask when the gas is hot, thereby obtaining the recovered SBS modified asphalt;
s7: and (3) measuring the penetration of the recycled SBS modified asphalt: determination of needle penetration P of recycled SBS modified asphaltt；
S8: determining short-term aging test parameters of SBS modified asphalt: the penetration P of the recycled SBS modified asphalt obtained in the step S7 is measuredtSubstituting the aging time T into the SBS modified asphalt nonlinear aging equation established in the step S4 to calculate and obtain the aging time T of the recycled SBS modified asphalt, wherein the aging time T is the short-term aging test parameter of the SBS modified asphalt.
2. The method for determining the short-term aging test parameters of SBS modified asphalt as claimed in claim 1, wherein the method comprises the following steps: in step S8, after the aging time T of the recycled SBS modified asphalt is obtained through calculation, the aging time T is subjected to nearest rounding processing to obtain rounded aging time T1Wherein, the rounding principle is as follows: t is10.5N, N is a positive integer greater than 1, and | T1-T|≤0.25；T、T1The unit of (A) is h; the rounded aging time T1Namely the parameters of the short-term aging test of the SBS modified asphalt.
3. The method for determining the short-term aging test parameters of SBS modified asphalt as claimed in claim 1, wherein the method comprises the following steps: the steps S5, S6, S7 and S8 are all provided with parallelsThe number of the parallel samples is eight groups; aging time T of recovered SBS modified asphalt of eight groups of parallel samples in step S8iTaking an average to obtain
1, … …, 8; the average value
Namely the aging time T of the recycled SBS modified asphalt.
4. The method for determining the short-term aging test parameters of SBS modified asphalt as claimed in claim 1, wherein the method comprises the following steps: in step S6, the method of dissolving the SBS modified asphalt mixture with trichloroethylene by stirring at normal temperature.
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