CN113008738B - Method for determining short-term aging test parameters of SBS modified asphalt - Google Patents
Method for determining short-term aging test parameters of SBS modified asphalt Download PDFInfo
- Publication number
- CN113008738B CN113008738B CN202110256764.7A CN202110256764A CN113008738B CN 113008738 B CN113008738 B CN 113008738B CN 202110256764 A CN202110256764 A CN 202110256764A CN 113008738 B CN113008738 B CN 113008738B
- Authority
- CN
- China
- Prior art keywords
- modified asphalt
- sbs modified
- aging
- penetration
- recovered
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000010426 asphalt Substances 0.000 title claims abstract description 273
- 230000032683 aging Effects 0.000 title claims abstract description 172
- 238000012360 testing method Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000035515 penetration Effects 0.000 claims abstract description 84
- 239000000203 mixture Substances 0.000 claims abstract description 55
- 238000010276 construction Methods 0.000 claims abstract description 20
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims description 53
- 238000004821 distillation Methods 0.000 claims description 52
- 238000009423 ventilation Methods 0.000 claims description 48
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 39
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims description 39
- 238000001514 detection method Methods 0.000 claims description 20
- 238000011084 recovery Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 7
- 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
- 238000005119 centrifugation Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000010998 test method Methods 0.000 description 13
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000000605 extraction Methods 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000036314 physical performance Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
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 simulated by indoor short-term aging and the field aging degree have no correlation when the conventional short-term aging test parameters are applied to the measurement 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 as is; s3: measuring the penetration as is and the penetration of residues; s4: establishing a nonlinear aging equation of SBS modified asphalt; s5: sampling the SBS modified asphalt mixture; s6: recovering SBS modified asphalt from the SBS modified asphalt mixture; s7: measuring penetration of the recovered SBS modified asphalt; s8: and determining short-term aging test parameters of the SBS modified asphalt. The invention simulates the site construction condition of the SBS modified asphalt mixture to the maximum extent, and the short-term aging test parameters of the SBS modified asphalt determined by the method can accurately evaluate 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 pavement asphalt can be divided into aging in the processes of mixing, transporting, paving and rolling of the mixture and aging in the process of using the pavement, and short-term aging can be considered to be completed when the asphalt is paved and rolled. In the current test procedure of highway engineering asphalt and asphalt mixture (JTG E20-2001), asphalt film heating test (T0609-2011) and asphalt rotating film heating test (T0610-2011) are adopted to age asphalt for a short period, and the changes of the penetration, ductility, softening point, viscosity and other properties of residues after film heating are measured to evaluate the aging resistance of the asphalt. The test parameters of short-term aging such as test temperature, aging time and the like 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 measurement of SBS modified asphalt: because components, production and construction processes of the SBS modified asphalt are greatly different from those of the common asphalt, and the temperature of construction links such as mixing, paving, rolling and the like of the SBS modified asphalt mixture is far higher than that of the common asphalt mixture, if a short-term aging test method based on the construction conditions of the common asphalt mixture is adopted, the short-term aging test method obviously does not accord with the site construction conditions of the modified asphalt, so that the aging degree of the SBS modified asphalt simulated by indoor short-term aging is inevitably irrelevant to the site, misjudgment of the aging degree of the pavement modified asphalt is caused, and even design errors of the durability of the pavement are caused. Based on the above, it is necessary to design a method for determining short-term aging test parameters of SBS modified asphalt, which is used for determining short-term aging test parameters applicable to specific SBS modified asphalt, and accurately evaluating the aging resistance of SBS modified asphalt by using the test parameters, so as to know the aging condition of the modified asphalt pavement in time, and provide a basis for making an asphalt pavement maintenance decision scheme.
Disclosure of Invention
The invention provides a method for determining short-term aging test parameters of SBS modified asphalt, which aims to solve the problem that the aging degree of indoor short-term aging simulation and the field aging degree have no correlation when the conventional short-term aging test parameters are applied to the determination of SBS modified asphalt.
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 of SBS modified asphalt: taking an SBS modified asphalt sample from a construction site to obtain an original sample;
s2: indoor aging as is: preparing seven detection samples by the original samples obtained in the step S1, and putting each detection sample into a film heating oven for film heating test to obtain residues after film heating, wherein the test temperature of the seven detection samples is 180 ℃, and the aging time t of the seven detection samples is 85min, 180min, 270min, 300min, 360min, 450min and 540min respectively;
S3: determination of as-received penetration and residual penetration: determining the as-received penetration P 0 and the respective residue penetration P i, i=1, … …,7 in step S2;
S4: building a nonlinear aging equation of SBS modified asphalt: substituting the aging time t i in step S2, the as-received penetration P 0 measured in step S3, and the residual penetration P i into the following formulas, i=1, … …,7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the unit of the aging time t is min, and the units of the original penetration P 0 and the residual penetration P i are 0.1mm;
obtaining constants r and L, thereby obtaining a SBS modified asphalt nonlinear aging equation;
S5: sampling of SBS modified asphalt mixture: mixing and rolling the SBS modified asphalt mixture 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 enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 12-20 hours, 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 relative centrifugal acceleration 7000G during centrifugation, and removing mineral powder in the trichloroethylene solution of the SBS modified asphalt for 30min or more to obtain an extract;
c) Firstly pouring the extract into a clean distillation flask, then cleaning an extract container with a small amount of trichloroethylene, pouring the cleaning liquid into the distillation flask, and then adding 20 glass beads with the particle size of 3mm into the distillation flask; finally, connecting the distillation flask to an Abelsen method distillation device;
d) Heating the distillation flask, and when the extracting solution starts to boil, adjusting the heating temperature of the oil bath heater to keep the distillation recovery speed of the extracting solution at 6ml/min-10ml/min; when the temperature of the extracting solution reaches 135 ℃, opening a ventilation valve, extending into a CO 2 ventilation pipe downwards until the CO 2 ventilation pipe contacts with the bottle bottom, then adjusting the CO 2 ventilation valve, and controlling the CO 2 ventilation rate to be 180ml/min-220ml/min;
e) When the temperature of the extracting solution reaches 157-160 ℃, a CO 2 ventilation valve is regulated, so that the CO 2 ventilation rate is increased to 1550-1650 ml/min; simultaneously, the heating temperature of the oil bath heater is regulated to 160-166 ℃ so as to keep the temperature of the extracting solution at 160-166 ℃;
f) When no liquid drops drip in the condensing tube, keeping the ventilation rate and the heating temperature of the CO 2 unchanged, and continuing to introduce CO 2 gas for 40min to remove the liquid drops attached to the inner wall of the distillation flask; stopping introducing CO 2 gas, stopping heating, and pouring out the recovered SBS modified asphalt in the distillation flask while the recovered SBS modified asphalt is hot, thereby obtaining the recovered SBS modified asphalt;
S7: determination of penetration of recovered SBS modified asphalt: measuring the penetration P t of the recycled SBS modified asphalt;
S8: determination of short-term aging test parameters of SBS modified asphalt: substituting the penetration P t of the recovered SBS modified asphalt obtained in the step S7 into the SBS modified asphalt nonlinear aging equation established in the step S4, and calculating to obtain the aging time T of the recovered 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 the SBS modified asphalt in the step S1 is executed by referring to the T0601-2011 asphalt sampling method in the Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011); the operation method of the film heating test in the step S2 and the measuring method of the penetration in the step S3 and the step S7 are all executed by referring to the Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011); the sampling method of the SBS modified asphalt mixture in the step 5 is executed by referring to the sampling method of the T0701-2011 asphalt mixture in the Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011); the method for recovering asphalt from asphalt mixture (Abelsen method) in step S6 is carried out by referring to T0726-2011 in Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011).
According to the invention, the needle penetration index is selected to establish a SBS modified asphalt nonlinear aging equation, and the selection reasons are as follows: generally, the penetration, ductility and road performance physical performance indexes and aging conditions of the SBS modified asphalt have good regularity, and the workload of asphalt extraction and recovery test is increased and the human operation error is increased by considering that the ductility asphalt is used in a large amount. Therefore, the penetration is selected as an index to establish a non-linear aging equation of the SBS modified asphalt, and the accuracy of the short-term aging test parameters of the SBS modified asphalt determined by the method is further improved.
The invention optimizes the test conditions and steps of the SBS modified asphalt recovery, and firstly: because the dissolution rate of the SBS modified asphalt is slower than that of the common asphalt, the invention prolongs the dissolution 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, optimizing the conditions of the centrifugal extraction of the trichloroethylene solution of the SBS modified asphalt, and ensuring that mineral powder can be completely separated and removed; thirdly, the control of CO 2 ventilation rate and the control of heating temperature in the distillation process are optimized, the recovery effect of the recovered SBS modified asphalt is improved, the accuracy of ageing time T calculated by the recovered SBS modified asphalt is increased, and the accuracy of short-term ageing test parameters of the SBS modified asphalt determined by the method is further improved.
In step S8, after the ageing time T of the recovered SBS modified asphalt is calculated, the ageing time T is rounded by adopting a nearby rounding process to obtain a rounded ageing time T 1, where the rounding principle is as follows: t 1 = 0.5n, n being a positive integer greater than 1, and the units of |t 1-T|≤0.25;T、T1 are all h; the ageing time T 1 after rounding is the short-term ageing test parameter of the SBS modified asphalt.
The rounding treatment is convenient for standardized operation of short-term aging test of SBS modified asphalt.
Step S5, step S6, step S7 and step S8 are respectively provided with parallel samples, and the number of the parallel samples is eight groups; in the step S8, the aging time T i of eight groups of parallel samples of the recovered SBS modified asphalt is averaged to obtainI=1, … …,8; the average value/>The aging time T of the recovered SBS modified asphalt is obtained.
Eight groups of parallel samples improve the accuracy of the short-term aging test parameters of the SBS modified asphalt determined by the method, and reduce the influence of recovery test operation errors on the accuracy of the short-term aging test parameters of the SBS modified asphalt.
In the step S6, the SBS modified asphalt mixture dissolved by trichloroethylene is stirred and dissolved at normal temperature.
The invention provides a method for determining short-term aging test parameters of SBS modified asphalt, which simulates the site construction condition of an SBS modified asphalt mixture to the greatest extent, solves the problem that the aging degree of indoor short-term aging simulation and the site aging degree have no correlation when the conventional short-term aging test parameters are applied to the determination of SBS modified asphalt, and can accurately evaluate the short-term aging performance of the SBS modified asphalt by utilizing the short-term aging test parameters of the SBS modified asphalt determined by the method, know the aging condition of a modified asphalt pavement in time and provide a basis for the establishment 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 of SBS modified asphalt: taking an SBS modified asphalt sample from a construction site to obtain an original sample;
s2: indoor aging as is: preparing seven detection samples by the original samples obtained in the step S1, and putting each detection sample into a film heating oven for film heating test to obtain residues after film heating, wherein the test temperature of the seven detection samples is 180 ℃, and the aging time t of the seven detection samples is 85min, 180min, 270min, 300min, 360min, 450min and 540min respectively;
S3: determination of as-received penetration and residual penetration: determining the as-received penetration P 0 and the respective residue penetration P i, i=1, … …,7 in step S2;
S4: building a nonlinear aging equation of SBS modified asphalt: substituting the aging time t i in step S2, the as-received penetration P 0 measured in step S3, and the residual penetration P i into the following formulas, i=1, … …,7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the unit of the aging time t is min, and the units of the original penetration P 0 and the residual penetration P i are 0.1mm;
obtaining constants r and L, thereby obtaining a SBS modified asphalt nonlinear aging equation;
S5: sampling of SBS modified asphalt mixture: mixing and rolling the SBS modified asphalt mixture 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 stirring and dissolving at normal temperature, the adding amount of the trichloroethylene is enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 12 hours, 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 relative centrifugal acceleration 7000G during centrifugation, and removing mineral powder in the trichloroethylene solution of the SBS modified asphalt for 30min to obtain an extract;
c) Firstly pouring the extract into a clean distillation flask, then cleaning an extract container with a small amount of trichloroethylene, pouring the cleaning liquid into the distillation flask, and then adding 20 glass beads with the particle size of 3mm into the distillation flask; finally, connecting the distillation flask to an Abelsen method distillation device;
d) Heating the distillation flask, and when the extracting solution starts to boil, adjusting the heating temperature of the oil bath heater to keep the distillation recovery speed of the extracting solution at 6ml/min; when the temperature of the extracting solution reaches 135 ℃, opening a ventilation valve, extending into a CO 2 ventilation pipe downwards until the CO 2 ventilation pipe contacts with the bottle bottom, then adjusting the CO 2 ventilation valve, and controlling the CO 2 ventilation rate to be 180ml/min;
e) When the temperature of the extracting solution reaches 157 ℃, a CO 2 ventilation valve is adjusted, so that the CO 2 ventilation rate is increased to 1550ml/min; simultaneously, the heating temperature of the oil bath heater is regulated to 160 ℃ so as to keep the temperature of the extracting solution at 160 ℃;
f) When no liquid drops drip in the condensing tube, keeping the ventilation rate and the heating temperature of the CO 2 unchanged, and continuing to introduce CO 2 gas for 40min to remove the liquid drops attached to the inner wall of the distillation flask; stopping introducing CO 2 gas, stopping heating, and pouring out the recovered SBS modified asphalt in the distillation flask while the recovered SBS modified asphalt is hot, thereby obtaining the recovered SBS modified asphalt;
S7: determination of penetration of recovered SBS modified asphalt: measuring the penetration P t of the recycled SBS modified asphalt;
S8: determination of short-term aging test parameters of SBS modified asphalt: firstly substituting the penetration P t of the recovered SBS modified asphalt obtained by measurement in the step S7 into the SBS modified asphalt nonlinear aging equation established in the step S4, and calculating to obtain the aging time T of the recovered SBS modified asphalt; then, the aging time T is subjected to nearby rounding treatment to obtain rounded aging time T 1, wherein the rounding principle is as follows: t 1 = 0.5n, n being a positive integer greater than 1, and the units of |t 1-T|≤0.25;T、T1 are all h; the ageing time T 1 after rounding is the short-term ageing test parameter of the SBS modified asphalt.
Step S5, step S6, step S7 and step S8 are respectively provided with parallel samples, and the number of the parallel samples is eight groups; in the step S8, the aging time T i of eight groups of parallel samples of the recovered SBS modified asphalt is averaged to obtainI=1, … …,8; the average value/>The aging time T of the recovered SBS modified asphalt is obtained.
Example 2
A method for determining short-term aging test parameters of SBS modified asphalt is realized by the following steps:
s1: sampling of SBS modified asphalt: taking an SBS modified asphalt sample from a construction site to obtain an original sample;
s2: indoor aging as is: preparing seven detection samples by the original samples obtained in the step S1, and putting each detection sample into a film heating oven for film heating test to obtain residues after film heating, wherein the test temperature of the seven detection samples is 180 ℃, and the aging time t of the seven detection samples is 85min, 180min, 270min, 300min, 360min, 450min and 540min respectively;
S3: determination of as-received penetration and residual penetration: determining the as-received penetration P 0 and the respective residue penetration P i, i=1, … …,7 in step S2;
S4: building a nonlinear aging equation of SBS modified asphalt: substituting the aging time t i in step S2, the as-received penetration P 0 measured in step S3, and the residual penetration P i into the following formulas, i=1, … …,7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the unit of the aging time t is min, and the units of the original penetration P 0 and the residual penetration P i are 0.1mm;
obtaining constants r and L, thereby obtaining a SBS modified asphalt nonlinear aging equation;
S5: sampling of SBS modified asphalt mixture: mixing and rolling the SBS modified asphalt mixture 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 stirring and dissolving at normal temperature, the adding amount of the trichloroethylene is enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 20 hours, 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 relative centrifugal acceleration 7000G during centrifugation, and removing mineral powder in the trichloroethylene solution of the SBS modified asphalt for 45min to obtain an extract;
c) Firstly pouring the extract into a clean distillation flask, then cleaning an extract container with a small amount of trichloroethylene, pouring the cleaning liquid into the distillation flask, and then adding 20 glass beads with the particle size of 3mm into the distillation flask; finally, connecting the distillation flask to an Abelsen method distillation device;
d) Heating the distillation flask, and when the extracting solution starts to boil, adjusting the heating temperature of the oil bath heater to keep the distillation recovery speed of the extracting solution at 10ml/min; when the temperature of the extracting solution reaches 135 ℃, opening a ventilation valve, extending into a CO 2 ventilation pipe downwards until the CO 2 ventilation pipe contacts with the bottle bottom, then adjusting the CO 2 ventilation valve, and controlling the CO 2 ventilation rate to be 220ml/min;
e) When the temperature of the extracting solution reaches 160 ℃, a CO 2 ventilation valve is regulated, so that the CO 2 ventilation rate is increased to 1650ml/min; simultaneously, the heating temperature of the oil bath heater is regulated to 166 ℃ so as to keep the temperature of the extracting solution at 166 ℃;
f) When no liquid drops drip in the condensing tube, keeping the ventilation rate and the heating temperature of the CO 2 unchanged, and continuing to introduce CO 2 gas for 40min to remove the liquid drops attached to the inner wall of the distillation flask; stopping introducing CO 2 gas, stopping heating, and pouring out the recovered SBS modified asphalt in the distillation flask while the recovered SBS modified asphalt is hot, thereby obtaining the recovered SBS modified asphalt;
S7: determination of penetration of recovered SBS modified asphalt: measuring the penetration P t of the recycled SBS modified asphalt;
S8: determination of short-term aging test parameters of SBS modified asphalt: firstly substituting the penetration P t of the recovered SBS modified asphalt obtained by measurement in the step S7 into the SBS modified asphalt nonlinear aging equation established in the step S4, and calculating to obtain the aging time T of the recovered SBS modified asphalt; then, the aging time T is subjected to nearby rounding treatment to obtain rounded aging time T 1, wherein the rounding principle is as follows: t 1 = 0.5n, n being a positive integer greater than 1, and the units of |t 1-T|≤0.25;T、T1 are all h; the ageing time T 1 after rounding is the short-term ageing test parameter of the SBS modified asphalt.
Step S5, step S6, step S7 and step S8 are respectively provided with parallel samples, and the number of the parallel samples is eight groups; in the step S8, the aging time T i of eight groups of parallel samples of the recovered SBS modified asphalt is averaged to obtainI=1, … …,8; the average value/>The aging time T of the recovered SBS modified asphalt is obtained.
Example 3
A method for determining short-term aging test parameters of SBS modified asphalt is realized by the following steps:
s1: sampling of SBS modified asphalt: taking an SBS modified asphalt sample from a construction site to obtain an original sample;
s2: indoor aging as is: preparing seven detection samples by the original samples obtained in the step S1, and putting each detection sample into a film heating oven for film heating test to obtain residues after film heating, wherein the test temperature of the seven detection samples is 180 ℃, and the aging time t of the seven detection samples is 85min, 180min, 270min, 300min, 360min, 450min and 540min respectively;
S3: determination of as-received penetration and residual penetration: determining the as-received penetration P 0 and the respective residue penetration P i, i=1, … …,7 in step S2;
S4: building a nonlinear aging equation of SBS modified asphalt: substituting the aging time t i in step S2, the as-received penetration P 0 measured in step S3, and the residual penetration P i into the following formulas, i=1, … …,7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the unit of the aging time t is min, and the units of the original penetration P 0 and the residual penetration P i are 0.1mm;
obtaining constants r and L, thereby obtaining a SBS modified asphalt nonlinear aging equation;
S5: sampling of SBS modified asphalt mixture: mixing and rolling the SBS modified asphalt mixture 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 stirring and dissolving at normal temperature, the adding amount of the trichloroethylene is enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 15 hours, 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 relative centrifugal acceleration 7000G during centrifugation, and removing mineral powder in the trichloroethylene solution of the SBS modified asphalt for 35min to obtain an extract;
c) Firstly pouring the extract into a clean distillation flask, then cleaning an extract container with a small amount of trichloroethylene, pouring the cleaning liquid into the distillation flask, and then adding 20 glass beads with the particle size of 3mm into the distillation flask; finally, connecting the distillation flask to an Abelsen method distillation device;
d) Heating the distillation flask, and when the extracting solution starts to boil, adjusting the heating temperature of the oil bath heater to keep the distillation recovery speed of the extracting solution at 7ml/min; when the temperature of the extracting solution reaches 135 ℃, opening a ventilation valve, extending into a CO 2 ventilation pipe downwards until the CO 2 ventilation pipe contacts with the bottle bottom, then adjusting the CO 2 ventilation valve, and controlling the CO 2 ventilation rate to be 195ml/min;
e) When the temperature of the extracting solution reaches 158 ℃, a CO 2 ventilation valve is regulated, so that the CO 2 ventilation rate is increased to 1580ml/min; simultaneously, the heating temperature of the oil bath heater is regulated to 162 ℃ so as to keep the temperature of the extracting solution at 162 ℃;
f) When no liquid drops drip in the condensing tube, keeping the ventilation rate and the heating temperature of the CO 2 unchanged, and continuing to introduce CO 2 gas for 40min to remove the liquid drops attached to the inner wall of the distillation flask; stopping introducing CO 2 gas, stopping heating, and pouring out the recovered SBS modified asphalt in the distillation flask while the recovered SBS modified asphalt is hot, thereby obtaining the recovered SBS modified asphalt;
S7: determination of penetration of recovered SBS modified asphalt: measuring the penetration P t of the recycled SBS modified asphalt;
S8: determination of short-term aging test parameters of SBS modified asphalt: firstly substituting the penetration P t of the recovered SBS modified asphalt obtained by measurement in the step S7 into the SBS modified asphalt nonlinear aging equation established in the step S4, and calculating to obtain the aging time T of the recovered SBS modified asphalt; then, the aging time T is subjected to nearby rounding treatment to obtain rounded aging time T 1, wherein the rounding principle is as follows: t 1 = 0.5n, n being a positive integer greater than 1, and the units of |t 1-T|≤0.25;T、T1 are all h; the ageing time T 1 after rounding is the short-term ageing test parameter of the SBS modified asphalt.
Step S5, step S6, step S7 and step S8 are respectively provided with parallel samples, and the number of the parallel samples is eight groups; in the step S8, the aging time T i of eight groups of parallel samples of the recovered SBS modified asphalt is averaged to obtainI=1, … …,8; the average value/>The aging time T of the recovered SBS modified asphalt is obtained.
Example 4
A method for determining short-term aging test parameters of SBS modified asphalt is realized by the following steps:
S1: selecting a certain highway construction site shell SBS finished product modified asphalt, and performing TFOT 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 procedure (JTGE 20-2011), wherein the test temperature is 180 ℃, and the aging test time is 85min, 180min, 270min, 360min, 450min and 540min respectively. Then, performance tests of penetration at 25 ℃, ductility at 5 ℃ and softening point were performed, and the test results are shown in table 1:
TABLE 1 Performance index of SBS modified asphalt before and after aging under different aging conditions in example 4
As shown in Table 1, the physical performance indexes of road performance such as penetration, ductility and the like of the SBS modified asphalt have good regularity with aging conditions, and the softening point is affected by the SBS content, the self-properties of the matrix asphalt, the compatibility and the like, so that the change rule is not uniform. Considering that the using amount of the ductility asphalt is large, the workload of asphalt extraction and test is increased, and the manual operation error is increased. Therefore, the penetration is selected as an index to establish a nonlinear simulation equation of the SBS modified asphalt binder.
S2: building a nonlinear aging equation of SBS modified asphalt: substituting the aging time t i, the as-received penetration P 0, and the residual penetration P i in step S1 into the following formulas, i=1, … …,7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the unit of the aging time t is min, and the units of the original penetration P 0 and the residual penetration P i are 0.1mm;
The constant r= -0.00145, l=1.77 was found to obtain the nonlinear aging equation as follows:
P(t)＝103.899/(1+0.77e0.00145t)
S3: sampling of SBS modified asphalt mixture: mixing and rolling the SBS modified asphalt mixture 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 stirring and dissolving at normal temperature, the adding amount of the trichloroethylene is enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 18 hours, 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 relative centrifugal acceleration 7000G during centrifugation, and removing mineral powder in the trichloroethylene solution of the SBS modified asphalt for 41min to obtain an extract;
c) Firstly, pouring 350-400ml of extract into a clean 500ml distillation flask, washing with a small amount of solvent, pouring into the flask, putting 20 glass beads with the particle size of 3mm into the flask, preventing bumping in the later heating process, and connecting Abelsen recovery equipment according to the requirements of T0726-2011 in the test procedure of highway engineering asphalt and asphalt mixture (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 ensure that the distillation recovery speed of the extracting solution is kept to be 9ml/min; when the temperature of the extracting solution reaches 135 ℃, opening a ventilation valve, extending into a CO 2 ventilation pipe downwards until the CO 2 ventilation pipe contacts with the bottle bottom, then adjusting the CO 2 ventilation valve, and controlling the CO 2 ventilation rate to be 205ml/min;
e) When the temperature of the extracting solution reaches 159 ℃, a CO 2 ventilation valve is regulated, so that the CO 2 ventilation rate is increased to 1600ml/min; simultaneously controlling the heating temperature of the oil bath to keep the temperature of the solution at 164 ℃; keeping the carbon dioxide aeration rate unchanged, continuously heating for 15min, if solvent is dripped in a condenser tube or solvent vapor droplets are attached to the inner wall of the upper part of the distillation flask after 15min, continuously blowing carbon dioxide for 40min after the trichloroethylene solvent stops dripping, and removing solvent vapor on the inner wall of the distillation flask. During this process, the heating temperature remains unchanged;
f) When the distillation is finished, stopping introducing carbon dioxide and heating, pouring the recovered SBS modified asphalt in the distillation flask into a container while the distilled asphalt is hot, and testing the penetration of the recovered SBS modified asphalt.
TABLE 2 penetration of SBS modified asphalt recovered by extraction in example 4 and its original penetration
S5: 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 recovered SBS modified asphalt respectively as follows: 537.14min, 520.17min, 562.80min, 545.66min, 522.99min, 537.14min, 517.35min, 539.98min; averaging the aging time of eight groups of parallel samples of the recovered SBS modified asphalt, and calculating to obtain 535.40min; the average value 535.40min is the aging time T of the recovered SBS modified asphalt; in order to facilitate the control of test time, indoor aging test conditions of SBS modified asphalt binder are recommended to be controlled as follows: standing for 540min at 180 ℃ in an indoor film oven.
S6: and (3) selecting the as-constructed SBS modified asphalt at the construction site to carry out an indoor film oven (TFOT) aging test, and selecting test conditions determined in the step (S5): and placing the mixture for 540min at 180 ℃ of an indoor film oven, 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 validation 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 to stand at 180℃for 540 minutes. The highway engineering asphalt and asphalt mixture test procedure specifies that the allowable error of penetration repeatability test is less than or equal to 2, and the penetration difference between the verification test result and the recovered asphalt is within 2. Considering the self errors of penetration test and extraction recovery test, the aging degree of the modified asphalt aged by 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 a short-term aging test according to the test procedure in the test procedure of highway engineering asphalt and asphalt mixture (JTG E20-2011), wherein the test conditions are as follows: aging temperature is 180 ℃ and aging time is 540min. After the aging, the penetration, ductility, softening point, viscosity and other changes of the residue after the short-term aging were 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 of SBS modified asphalt: taking an SBS modified asphalt sample from a construction site to obtain an original sample;
s2: indoor aging as is: preparing seven detection samples by the original samples obtained in the step S1, and putting each detection sample into a film heating oven for film heating test to obtain residues after film heating, wherein the test temperature of the seven detection samples is 180 ℃, and the aging time t of the seven detection samples is 85min, 180min, 270min, 300min, 360min, 450min and 540min respectively;
S3: determination of as-received penetration and residual penetration: determining the as-received penetration P 0 and the respective residue penetration P i, i=1, … …,7 in step S2;
S4: building a nonlinear aging equation of SBS modified asphalt: substituting the aging time t i in step S2, the as-received penetration P 0 measured in step S3, and the residual penetration P i into the following formulas, i=1, … …,7;
P(t)＝(LP0)/[1+(L-1)e-rt]，
wherein the unit of the aging time t is min, and the units of the original penetration P 0 and the residual penetration P i are 0.1mm;
obtaining constants r and L, thereby obtaining a SBS modified asphalt nonlinear aging equation;
S5: sampling of SBS modified asphalt mixture: mixing and rolling the SBS modified asphalt mixture 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 enough to completely dissolve the SBS modified asphalt in the SBS modified asphalt mixture, and the dissolving time is 12-20 hours, 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 relative centrifugal acceleration 7000G during centrifugation, and removing mineral powder in the trichloroethylene solution of the SBS modified asphalt for 30min or more to obtain an extract;
c) Firstly pouring the extract into a clean distillation flask, then cleaning an extract container with a small amount of trichloroethylene, pouring the cleaning liquid into the distillation flask, and then adding 20 glass beads with the particle size of 3mm into the distillation flask; finally, connecting the distillation flask to an Abelsen method distillation device;
d) Heating the distillation flask, and when the extracting solution starts to boil, adjusting the heating temperature of the oil bath heater to keep the distillation recovery speed of the extracting solution at 6ml/min-10ml/min; when the temperature of the extracting solution reaches 135 ℃, opening a CO 2 ventilation valve, extending into a CO 2 ventilation pipe downwards until the CO 2 ventilation pipe contacts with the bottle bottom, then adjusting the CO 2 ventilation valve, and controlling the CO 2 ventilation rate to be 180ml/min-220ml/min;
e) When the temperature of the extracting solution reaches 157-160 ℃, a CO 2 ventilation valve is regulated, so that the CO 2 ventilation rate is increased to 1550-1650 ml/min; simultaneously, the heating temperature of the oil bath heater is regulated to 160-166 ℃ so as to keep the temperature of the extracting solution at 160-166 ℃;
f) When no liquid drops drip in the condensing tube, keeping the ventilation rate and the heating temperature of the CO 2 unchanged, and continuing to introduce CO 2 gas for 40min to remove the liquid drops attached to the inner wall of the distillation flask; stopping introducing CO 2 gas, stopping heating, and pouring out the recovered SBS modified asphalt in the distillation flask while the recovered SBS modified asphalt is hot, thereby obtaining the recovered SBS modified asphalt;
S7: determination of penetration of recovered SBS modified asphalt: measuring the penetration P t of the recycled SBS modified asphalt;
S8: determination of short-term aging test parameters of SBS modified asphalt: substituting the penetration P t of the recovered SBS modified asphalt obtained in the step S7 into the SBS modified asphalt nonlinear aging equation established in the step S4, and calculating to obtain the aging time T of the recovered 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 the SBS modified asphalt according to claim 1, wherein the method comprises the following steps of: in step S8, after the ageing time T of the recovered SBS modified asphalt is calculated, the ageing time T is rounded by adopting a nearby rounding process to obtain a rounded ageing time T 1, where the rounding principle is as follows: t 1 = 0.5n, n being a positive integer greater than 1, and the units of |t 1-T|≤0.25;T、T1 are all h; the ageing time T 1 after rounding is the short-term ageing test parameter of the SBS modified asphalt.
3. The method for determining the short-term aging test parameters of the SBS modified asphalt according to claim 1, wherein the method comprises the following steps of: step S5, step S6, step S7 and step S8 are respectively provided with parallel samples, and the number of the parallel samples is eight groups; in the step S8, the aging time T i of eight groups of parallel samples of the recovered SBS modified asphalt is averaged to obtainThe average value/>The aging time T of the recovered SBS modified asphalt is obtained.
4. The method for determining the short-term aging test parameters of the SBS modified asphalt according to claim 1, wherein the method comprises the following steps of: in the step S6, the SBS modified asphalt mixture dissolved by trichloroethylene is stirred and dissolved at normal temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110256764.7A CN113008738B (en) | 2021-03-09 | 2021-03-09 | Method for determining short-term aging test parameters of SBS modified asphalt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110256764.7A CN113008738B (en) | 2021-03-09 | 2021-03-09 | Method for determining short-term aging test parameters of SBS modified asphalt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113008738A CN113008738A (en) | 2021-06-22 |
| CN113008738B true CN113008738B (en) | 2024-04-19 |
Family
ID=76403232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110256764.7A Active CN113008738B (en) | 2021-03-09 | 2021-03-09 | Method for determining short-term aging test parameters of SBS modified asphalt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113008738B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU78316U1 (en) * | 2008-07-08 | 2008-11-20 | Общество с ограниченной ответственностью "Строительная лаборатория" (ООО "Строительная лаборатория") | DEVICE FOR DETERMINING THE AGING OF BITUMENS |
| CN104048985A (en) * | 2014-06-06 | 2014-09-17 | 西安公路研究院 | Method for determining mixing amount of modifying agent in SBS modified asphalt |
| CN110455740A (en) * | 2019-07-17 | 2019-11-15 | 武汉科技大学 | A kind of ageing of asphalt time-histories prediction technique |
| CN110987855A (en) * | 2019-11-25 | 2020-04-10 | 苏交科集团股份有限公司 | Rapid asphalt aging detection method based on ATR-FTIR |
| CN111426650A (en) * | 2020-03-19 | 2020-07-17 | 湖南大学 | Evaluation method for aging law of SBS modified asphalt |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7317045B2 (en) * | 2005-09-06 | 2008-01-08 | Natalino Zanchetta | Polyethylene modified asphalt compositions |
| AU2017378888A1 (en) * | 2016-12-19 | 2019-07-04 | Blacklidge Emulsions Inc. | Age resistant coatings and methods for treating roadway substrates |
-
2021
- 2021-03-09 CN CN202110256764.7A patent/CN113008738B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU78316U1 (en) * | 2008-07-08 | 2008-11-20 | Общество с ограниченной ответственностью "Строительная лаборатория" (ООО "Строительная лаборатория") | DEVICE FOR DETERMINING THE AGING OF BITUMENS |
| CN104048985A (en) * | 2014-06-06 | 2014-09-17 | 西安公路研究院 | Method for determining mixing amount of modifying agent in SBS modified asphalt |
| CN110455740A (en) * | 2019-07-17 | 2019-11-15 | 武汉科技大学 | A kind of ageing of asphalt time-histories prediction technique |
| CN110987855A (en) * | 2019-11-25 | 2020-04-10 | 苏交科集团股份有限公司 | Rapid asphalt aging detection method based on ATR-FTIR |
| CN111426650A (en) * | 2020-03-19 | 2020-07-17 | 湖南大学 | Evaluation method for aging law of SBS modified asphalt |
Non-Patent Citations (2)
| Title |
|---|
| Influence of SBS Modifier on Aging Behaviors of SBS-Modified Asphalt;Chuanwen Wei et al.;《J. Mater. Civ. Eng.》;第1-8页 * |
| SBS改性沥青老化温度与老化时间的关系;李兰 等;《山西建筑》;第43卷(第8期);第126-127页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113008738A (en) | 2021-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113008738B (en) | Method for determining short-term aging test parameters of SBS modified asphalt | |
| Wang et al. | Experimental characterization of storage stability of crumb rubber modified bitumen with warm-mix additives | |
| CN101694450A (en) | Method for detecting dose of polymers in modified asphalt based on viscosity-temperature curve | |
| US10449502B2 (en) | Methods for analyzing hydrocarbons and hydrocarbon blends for chemical compositions | |
| NO312466B1 (en) | Bituminous Mixture | |
| Lu et al. | Analysis of asphaltenes and maltenes before and after long-term aging of bitumen | |
| Plata-Gryl et al. | An improved scalable method of isolating asphaltenes | |
| US20110056271A1 (en) | Method for measurement of crude oil and bitumen dead oil viscosity and density | |
| CN104498291A (en) | Method for controlling automatic liquor blending by virtue of real-time smell detection technology | |
| Haghshenas et al. | Research on High-RAP Asphalt Mixtures with Rejuvenators-Phase II | |
| NO166978B (en) | PROCEDURE FOR DETERMINING THE OIL SEATING OF AN EARTH FORM. | |
| Motamed et al. | Emulsified asphalt residue recovery and characterization: Combined use of moisture analyzer balance and dynamic shear rheometer | |
| GB2446867A (en) | Method for determining Total Acid Number (TAN) | |
| Hoiberg et al. | Analytical fractionation of asphalts | |
| Turuga | Effect of Solvent Deasphalting Process on the Properties of Deasphalted Oil and Asphaltenes From Bitumen | |
| Delfosse et al. | Performance control of bituminous mixtures with a high RAP content | |
| CN114354680A (en) | PAG quenching medium cooling performance analysis method | |
| Błażejowski et al. | Bitumen handbook | |
| CN112630419B (en) | Method for judging asphalt aging degree in asphalt mixture | |
| da Silva Lopes et al. | Impact of aging protocols on asphalt binder behavior: A laboratory and field study | |
| CN105758897A (en) | White peony fragrance grade discriminating method based on electronic nose detection information | |
| CN113970500B (en) | Rapid determination method for oil content of greasy dirt solid waste | |
| Manolis et al. | Asphalt Extraction and Recovery Procedures an Introduction | |
| Sirin et al. | Evaluation of an improved Rotavapor aging apparatus using a Morton flask for simulation of hot-mixing on modified asphalts | |
| CN111521578A (en) | Infrared spectrum-based modified asphalt stability rapid prejudging method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |