CN116482165B - High-temperature performance evaluation method of SBS modified asphalt - Google Patents
High-temperature performance evaluation method of SBS modified asphalt Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 118
- 238000011156 evaluation Methods 0.000 title abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 111
- 238000010008 shearing Methods 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 38
- 230000009471 action Effects 0.000 claims abstract description 22
- 230000001186 cumulative effect Effects 0.000 claims abstract description 14
- 238000012417 linear regression Methods 0.000 claims abstract description 11
- 238000011068 loading method Methods 0.000 claims abstract description 8
- 238000001304 sample melting Methods 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 230000004044 response Effects 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 description 13
- 239000000203 mixture Substances 0.000 description 12
- 238000005457 optimization Methods 0.000 description 9
- 239000003607 modifier Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 239000003381 stabilizer Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 241000132007 Bahia Species 0.000 description 1
- 229930194845 Bahia Natural products 0.000 description 1
- 235000017858 Laurus nobilis Nutrition 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention relates to the technical field of asphalt detection and evaluation, in particular to a method for evaluating high-temperature performance of SBS modified asphalt, which comprises the following steps: respectively applying stress sigma by dynamic shear rheometer 1 、σ 2 Continuously performing repeated creep test on the sample to be tested to obtain the acting stress sigma of the sample to be tested 1 、σ 2 Cumulative strain ε under 1i 、ε 2j The method comprises the steps of carrying out a first treatment on the surface of the Will accumulate strain ε 1i 、ε 2j Performing linear regression on the times of action in the repeated creep test to obtain the slope K of the curve after linear regression σ1 、K σ2 The method comprises the steps of carrying out a first treatment on the surface of the Calculating to obtain the shearing resistance coefficient S of the sample to be measured c According to the shearing coefficient S c The high temperature performance of SBS modified asphalt was evaluated. The method has higher sensitivity to the change of the action stress according to the SBS modified asphalt, and can accurately represent the response of the SBS modified asphalt to the loading stress, so that the high-temperature performance of the SBS modified asphalt is accurately evaluated, and the method has higher precision and reliability and wide application range.
Description
Technical Field
The invention relates to the technical field of asphalt detection and evaluation, in particular to a method for evaluating high-temperature performance of SBS modified asphalt.
Background
Currently, there are three main types of classification criteria for road asphalt, namely penetration classification, viscosity classification, and performance classification. Among them, the empirical penetration classification method has been adopted by most countries and regions, and the empirical viscosity classification method has been adopted by only some countries and regions although the empirical viscosity classification method has been advanced over the penetration classification method, whereas the linear viscoelastic theory based performance classification method is adopted by only some countries because of expensive equipment on the one hand and insufficient high temperature performance classification on the other hand.
Aiming at the defect of rutting factor G/sin delta in evaluating the high-temperature performance of modified asphalt, plazek and Shenoy obtain the irrecoverable compliance (1-1/(tan delta sin delta))/G of the modified asphalt based on a frequency scanning test, and then G/(sin delta) is also provided 9 And the high-temperature performance of the modified asphalt is used as an evaluation index. Bahia et al propose a Repeated Creep Recovery Test (RCRT) method and evaluate the high temperature performance of modified asphalt with its viscosity component Gv of creep compliance. In recent years, D' Angelo et al also proposed a multi-stress creep recovery (MSCR) test method based on the RCRT method, and used a modified asphalt creep recovery rate (R) and an unrecoverable creep compliance (Jnr) as evaluation indexes of high temperature performance. The MSCR test can better reflect the nonlinear viscoelastic response of the modified asphalt, and the nonlinear mechanical behavior has close relation with the permanent deformation of the asphalt pavement. In fact, in the case of the multi-stress creep recovery (MSCR) test, the creep recovery rate (R) gradually increases with increasing cycle number, and the unrecoverable creep compliance (Jnr) gradually decreases, both under 0.1KPa stress and under 3.2KPa stress. But the magnitude of the increase and decrease differs for different modified asphalts. The creep recovery (R) and the unrecoverable creep compliance (Jnr) obtained by the Multiple Stress Creep Recovery (MSCR) test are only average values over 10 cycles and do not show a true response of the viscoelasticity of the modified asphalt to the stress effect.
In addition, gao Junfeng, wang Hainian et al, when studying the high temperature rheology of SBS modified bio-asphalt binders, recognized that the stress magnitude has a significant impact on the cumulative strain, i.e., the deformation of the asphalt has an important relationship with the stress magnitude. And it is believed that studying the effect of different stress magnitudes on cumulative strain helps to select stress levels consistent with actual traffic loads for better use in practice. However, the research does not further explore the specific relationship between strain and stress magnitude and asphalt high temperature performance. Therefore, how to provide a method for rapidly and accurately evaluating the high-temperature performance of modified asphalt is still a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a high-temperature performance evaluation method of SBS modified asphalt, which overcomes the defects of the prior art and can effectively solve the problems of complex operation and low accuracy of the conventional high-temperature performance evaluation method of modified asphalt.
The technical scheme of the invention is realized by the following measures: the high-temperature performance evaluation method of the SBS modified asphalt comprises the following steps:
s1, respectively applying stress sigma by adopting a dynamic shear rheometer at the required test temperature 1 、σ 2 Continuously performing repeated creep test on the sample to be tested to obtain the acting stress sigma of the sample to be tested 1 、σ 2 Cumulative strain ε under 1i 、ε 2j ；
S2, accumulating strain epsilon 1i 、ε 2j Performing linear regression on the times of action in the repeated creep test to obtain the slope K of the curve after linear regression σ1 、K σ2 ；
S3, according to the slope K σ1 、K σ2 Calculating to obtain the shearing resistance coefficient S of the sample to be measured c According to the obtained shearing resistance coefficient S c The high temperature performance of SBS modified asphalt was evaluated.
The following are further optimizations and/or improvements to the above-described inventive solution:
in the step S1, the preparation of the sample test piece to be tested in the creep test is repeated, and the following steps are performed:
and (3) carrying out constant-temperature sample stirring on the SBS modified asphalt sample at a required sample melting temperature, pouring a 25mm parallel plate test die after the sample is uniform and bubbles are removed, and cooling to normal temperature to prepare a sample test piece to be tested for later use, wherein the sample melting temperature is 150-180 ℃, and the sample melting time is 0.5-2.5 h.
The sample melting temperature is 160-170 ℃, and the sample constant temperature period is 1.0-1.5 h.
In the above step S1, the creep test is repeated to continuously apply the stress sigma 1 、σ 2 Respectively carrying out repeated tests of 10 cycles, wherein each cycle is divided into a loading creep stage of 1s and an unloading recovery stage of 9s, the total test time is 200s, and the action stress sigma of the sample to be tested is obtained 1 、σ 2 Cumulative strain ε after the i and j th stresses under 1i 、ε 2j Wherein i=1, 2, 3..9, 10, j=1, 2, 3..9, 10.
In the step S1, the test temperature is 52 ℃ to 82 ℃ and the stress sigma is applied 1 、σ 2 0.05KPa to 1.0KPa, 3.0KPa to 6.0KPa, respectively.
In the step S1, the test temperature is 64 ℃ to 76 ℃ and the stress sigma is applied 1 、σ 2 0.1KPa to 0.5KPa, 4.0KPa to 5.0KPa, respectively.
In the step S1, the test temperature is 64 ℃; or/and, the test temperature is 70 ℃; or/and, the test temperature was 76 ℃.
In the above step S3, according to the slope K σ1 、K σ2 The shearing resistance coefficient S of the sample to be measured is obtained by calculation according to the following formula c ，
1 (1)
Wherein S is c K is the shear coefficient of the sample to be tested σ1 、K σ2 Respectively, cumulative strain epsilon 1i 、ε 2j Slope of the curve for the number of actions, A is a coefficient.
In the step S3, the shearing coefficient S c The value is inversely related to the high temperature performance of SBS modified asphalt.
When the test temperature is 70 ℃ and the coefficient A is 0.001, the test temperature is based on the shearing resistance coefficient S c The high temperature performance of SBS modified asphalt is divided into the following five grades:
when the shearing resistance coefficient S of the sample to be tested c When less than or equal to 5, itThe performance grade is a first grade;
when the shearing resistance coefficient of the sample to be tested is 5 < S c When the performance grade is less than or equal to 20, the performance grade is two-stage;
when the shearing resistance coefficient of the sample to be tested meets 20 < S c When the performance grade is less than or equal to 50, the performance grade is three-grade;
when the shearing resistance coefficient of the sample to be tested meets 50 < S c When the performance grade is less than or equal to 100, the performance grade is four grades;
when the shearing resistance coefficient of the sample to be tested meets S c At > 100, the performance rating is five.
The invention provides a high-temperature performance evaluation method of SBS modified asphalt, which has higher sensitivity to the change of acting stress according to the SBS modified asphalt, and can accurately represent the response of the SBS modified asphalt to loading stress, so that the high-temperature performance of the SBS modified asphalt is accurately evaluated, and the method has higher precision and reliability and wide application range.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention. The various chemical reagents and chemical supplies mentioned in the invention are all commonly known and used in the prior art unless specified otherwise; the room temperature and the room temperature in the present invention generally refer to temperatures ranging from 15 ℃ to 25 ℃, and are generally defined as 25 ℃.
The invention is further described below with reference to examples:
example 1: the method for evaluating the high-temperature performance of the SBS modified asphalt comprises the following steps:
s1, respectively applying stress sigma by adopting a dynamic shear rheometer at the required test temperature 1 、σ 2 Continuously performing repeated creep test on the sample to be tested to obtain the acting stress sigma of the sample to be tested 1 、σ 2 Cumulative strain ε under 1i 、ε 2j ；
S2, accumulating strain epsilon 1i 、ε 2j Performing linear regression on the times of action in the repeated creep test to obtain the slope K of the curve after linear regression σ1 、K σ2 ；
S3, according to the slope K σ1 、K σ2 Calculating to obtain the shearing resistance coefficient S of the sample to be measured c According to the obtained shearing resistance coefficient S c The high temperature performance of SBS modified asphalt was evaluated.
The invention provides a high-temperature performance evaluation method of SBS modified asphalt, which defines a shearing resistance coefficient S based on the difference of the linear viscoelastic response of SBS modified asphalt to low stress and the nonlinear viscoelastic response to high stress c And the sensitivity of the SBS modified asphalt to stress change is represented by the evaluation index, and the high-temperature performance of the SBS modified asphalt is evaluated. The linear regression mode in the method step S2 is unitary linear regression.
Example 2: as an optimization of the above embodiment, in step S1, the preparation of the sample specimen to be tested in the creep test is repeated, and the following steps are performed:
and (3) carrying out constant-temperature sample stirring on the SBS modified asphalt sample at a required sample melting temperature, pouring a 25mm parallel plate test die after the sample is uniform and bubbles are removed, and cooling to normal temperature to prepare a sample test piece to be tested for later use, wherein the sample melting temperature is 150-180 ℃, and the sample melting time is 0.5-2.5 h.
Example 3: as an optimization of the above example 2, the sample temperature was 160 ℃ to 170 ℃ and the sample duration was 1.0h to 1.5h.
In the invention, the SBS modified asphalt sample to be tested is SBS modified asphalt which needs to be subjected to multi-stress repeated creep test. The SBS modified asphalt sample can be SBS modified asphalt prepared in a laboratory, SBS modified asphalt obtained from an industrial production device and a storage tank, or SBS modified asphalt obtained from a construction site. When the sample to be measured is prepared, the sample melting temperature is 150-180 ℃, and the sample constant temperature period is 0.5-2.5 h. Further, the more preferable sample temperature is 160 ℃ to 170 ℃, and the more preferable sample duration of constant temperature is 1.0h to 1.5h. If individual samples are difficult to melt at 160-170 ℃, the temperature of the oven can be properly adjusted to 175-180 ℃, but care needs to be taken to control the sample melting time, so that overlong sample melting time is not needed, and the uniformity and the bubble free of the sample to be measured are ensured.
When the parallel plate test mold with the thickness of 25mm is poured, a plurality of test molds can be poured at one time, and the poured test molds are horizontally placed in a clean room temperature environment for cooling for standby. If the silica gel test mould is insufficient, the cast test mould can be horizontally placed in an air-clean freezer with the temperature of minus 18 ℃ for quick cooling, after cooling for 5 minutes, the solidified test piece is demoulded, the demoulded test piece is stored in a clean container, and meanwhile, the container for containing the test piece is continuously placed in the air-clean freezer with the temperature of minus 18 ℃ for standby, and the test piece is taken and used immediately during the test. And after the first batch of test pieces are demolded, the second batch of test pieces can be manufactured. In order to prevent the SBS modified asphalt from further reacting in the sample heating and melting process to cause the property change, the time required by the whole operation process from the beginning of heating the sample to the completion of all silica gel test casting is not more than 2.5 hours, and the sample to be tested cannot be heated for the second time.
Example 4: as an optimization of the above embodiment, in step S1, the creep test is repeated to continuously apply stress sigma 1 、σ 2 Respectively carrying out repeated tests of 10 cycles, wherein each cycle is divided into a loading creep stage of 1s and an unloading recovery stage of 9s, the total test time is 200s, and the action stress sigma of the sample to be tested is obtained 1 、σ 2 Cumulative strain ε after the i and j th stresses under 1i 、ε 2j Wherein i=1, 2, 3..9, 10, j=1, 2, 3..9, 10.
Example 5: as an optimization of the above embodiment, in step S1, the test temperature is 52 ℃ to 82 ℃, and the stress sigma is applied 1 、σ 2 0.05KPa to 1.0KPa, 3.0KPa to 6.0KPa, respectively.
Example 6: as an optimization of the above embodiment, in step S1, the test temperature is 64 ℃ to 76 ℃, and the stress sigma is applied 1 、σ 2 0.1KPa to 0.5KPa, 4.0KPa to 5.0KPa, respectively.
Example 7: as an optimization of the above example, in step S1, the test temperature was 64 ℃; or/and, the test temperature is 70 ℃; or/and, the test temperature was 76 ℃.
Example 8: as the aboveOptimization of the embodiment, in step S3, according to the slope K σ1 、K σ2 The shearing resistance coefficient S of the sample to be measured is obtained by calculation according to the following formula c ，
1 (1)
Wherein S is c K is the shear coefficient of the sample to be tested σ1 、K σ2 Respectively, cumulative strain epsilon 1i 、ε 2j Slope of the curve for the number of actions, A is a coefficient. In the present invention, for the convenience of classification based on the value of the shearing resistance coefficient, the coefficient A may be set to 0.1, 0.01, 0.001, 0.0001, as required.
Example 9: as an optimization of the above embodiment, in step S3, the shearing resistance coefficient S c The value is inversely related to the high temperature performance of SBS modified asphalt.
According to the definition and calculation formula of the shear coefficient Sc, when the grade of the matrix asphalt used by the SBS modified asphalt is lower, the polymer dosage is higher, the polymer molecular weight is higher, and the polymer is fully melt-mixed in the matrix asphalt, the shear coefficient Sc value is smaller, which means that the sensitivity of the SBS modified asphalt to the action stress is smaller, and the high-temperature performance of the SBS modified asphalt sample to be detected is reflected to be better. Otherwise, the worse.
Example 10: as an optimization of the above examples, when the test temperature is 70℃and the coefficient A is 0.001, the shear resistance coefficient S is determined c The high temperature performance of SBS modified asphalt is divided into the following five grades:
when the shearing resistance coefficient S of the sample to be tested c When the performance grade is less than or equal to 5, the performance grade is first grade;
when the shearing resistance coefficient of the sample to be tested is 5 < S c When the performance grade is less than or equal to 20, the performance grade is two-stage;
when the shearing resistance coefficient of the sample to be tested meets 20 < S c When the performance grade is less than or equal to 50, the performance grade is three-grade;
when the shearing resistance coefficient of the sample to be tested meets 50 < S c When the performance grade is less than or equal to 100, the performance grade is four grades;
when the sample to be measuredThe shearing resistance coefficient of the product meets S c At > 100, the performance rating is five.
In the invention, according to the shearing resistance coefficient S c The value divides the high temperature performance of SBS modified asphalt into five grades, wherein the optimal grade is one grade.
Example 11:
(1) preparation of samples 1 to 4
According to weight percentage, 95.7% (1435.5 g) of 70 # road asphalt of Shell company, 90 # road asphalt of Dalian Sitei petrochemical company, 70 # road asphalt of medium petroleum Yunnan petrochemical company, 90 # road asphalt of medium petroleum Krama petrochemical company, and 4.3% (64.5 g) of T6302H type SBS modifier of Chinese petroleum Dushan petrochemical company are mixed and heated to 180 ℃, sheared for 15min at 12000rpm/min by adopting FLUKOFM300 shearing instrument, so as to prepare a first mixture. Then adding a WD-2 stabilizer of 1.0 per mill (1.5 g) of Clamamanite Limited liability company into the first mixture, heating and keeping the temperature to 190 ℃, stirring, and reacting for 6 hours to obtain samples to be tested, wherein the samples are numbered from sample 1 to sample 4.
(2) Preparation of test piece to be tested
Placing the SBS modified asphalt sample to be tested in an electrothermal blowing drying oven at 165-170 ℃ for 1.0-1.5 h at constant temperature, slightly stirring, pouring a 25mm parallel plate test die after the sample is uniform and bubbles are removed, and cooling to normal temperature to prepare a test piece to be tested for later use.
(3) Testing high-temperature performance of a sample to be tested and processing data:
s1, continuously performing repeated creep tests for 10 periods on a sample to be tested at the test temperature of 70 ℃ by adopting an HR-1 type dynamic shear rheometer of TA Instruments under the action stress of 0.1KPa and the action stress of 4.0KPa to obtain the accumulated strain epsilon of the sample to be tested under the action stress of 0.1KPa and the action stress of 4.0KPa 1i 、ε 2j The test data are shown in Table 1;
s2, based on the experimental data in Table 1, the cumulative strain ε 1i 、ε 2j Performing linear regression on the times of action in the repeated creep test to obtain a linear regressionSlope K of curve σ1 、K σ2 ；
S3, respectively calculating shearing resistance coefficients S of the samples to be tested according to the formula 1 c According to the obtained shearing resistance coefficient S c Evaluating the high temperature performance of SBS modified asphalt; cumulative strain ε 1i 、ε 2j Linear fit equation, slope K, for the number of actions σ1 、K σ2 Shear coefficient S at A of 0.001 c The data are shown in Table 2. Meanwhile, according to the high temperature performance evaluation level of the SBS modified asphalt in example 10, the SBS modified asphalt of sample 1 and sample 2 may be ranked as two levels, and the SBS modified asphalt of sample 3 and sample 4 may be ranked as one level.
In addition, the softening point, rotational viscosity and rutting factor of samples 1 to 4 are respectively measured by adopting an asphalt softening point test (annular ball method) T0606-2011, an asphalt rotational viscosity test (Brookfield viscometer method) T0621-2011 and an asphalt rheological property test (dynamic shear rheometer method) T0628-2011 in highway engineering asphalt and asphalt mixture test procedure JTGE20-2011, and the test result and the shearing resistance coefficient S obtained by adopting the SBS modified asphalt high-temperature performance evaluation method of the invention are tested c See table 3.
As can be seen from table 3, the shear coefficients of the four SBS modified asphalts of samples 1 to 4 are consistent with the corresponding 135 ℃ rotational viscosity and rut factor test results, and have good correlation. Meanwhile, according to the method for evaluating high-temperature performance of SBS modified asphalt of the present invention, SBS modified asphalt of sample 1 and sample 2 may be ranked as two-stage, and SBS modified asphalt of sample 3 and sample 4 may be ranked as one-stage. Compared with the technical indexes of rotational viscosity, rutting resistance factor and shearing resistance coefficient at 135 ℃, the high-temperature performance of the SBS modified asphalt for evaluating samples 1 to 4 by adopting the technical indexes of softening points is inconsistent with the other three test results, which shows that the accuracy of evaluating the high-temperature performance of the SBS modified asphalt for samples 1 to 4 by adopting the asphalt softening point test method is poor.
Example 12:
(1) preparation of samples 5 to 7:
the first mixture was prepared by mixing and heating 90 # road asphalt corresponding to 95.5% (1432.5 g), 96.0% (1440.0 g) and 96.0% (1440.0 g) of medium petroleum caramek petrochemical company, respectively, with 4.5% (67.5 g) of T6302L SBS of China petroleum mountain petrochemical company, 4.0% (60.0 g) of SBS modifier of 1301-1 (YH-791H) of China petrochemical company, baling petrochemical company, and 4.0% (60.0 g) of T6302H SBS of China petroleum mountain petrochemical company, to 180℃and shearing at 12000rpm/min for 15min using FLUKOMM 300 shearing machine. Then, respectively adding WD-2 stabilizer of middle petroleum Clamamanite Limited liability company into the three first mixtures at a ratio of 1.2%1.8 g, heating and keeping the temperature to 195 ℃, stirring, and reacting for 6 hours to obtain samples to be tested, wherein the samples are numbered as sample 5 to sample 7.
(2) Preparing a test piece to be tested: same as in example 11.
(3) Testing high-temperature performance of a sample to be tested and processing data: same as in example 11.
In addition, the softening point, rotational viscosity, rutting factor of samples 5 to 7 were tested in the same manner as in example 11, and the test result and the shear coefficient S obtained by the SBS modified asphalt high temperature performance evaluation method of the present invention c See table 4.
As can be seen from table 4, compared with the T6302L-type SBS modifier used in sample 5, the YH-791H, T6302H-type SBS modifier used in samples 6 and 7 has a larger molecular weight, and the softening point and rotational viscosity of the SBS-modified asphalt are larger and the shear coefficient is smaller, even though the amount of the SBS-modified asphalt is relatively smaller. The test results of the softening point, the rotational viscosity and the shearing resistance coefficient show consistency, and the high-temperature performance of the SBS modified asphalt is reasonably evaluated by adopting the shearing resistance coefficient. In the embodiment, the test result of the rutting factor is inconsistent with the results obtained by other three test modes, which shows that compared with the technical index of rotational viscosity at 135 ℃ and shearing resistance coefficient, the high-temperature performance of the SBS modified asphalt in the embodiment is evaluated by adopting the rutting factor to have a certain defect.
Example 13:
(1) preparation of samples 8 to 11:
the first mixture was prepared by mixing 90 # road asphalt corresponding to 96% (1440 g), 95.7% (1435.5 g), 95.3% (1429.5 g), 95% (1425 g) of medium petroleum claima petrochemical company of limited responsibility with 4.0% (60 g), 4.3% (64.5 g), 4.7% (70.5 g), 5.0% (75 g) of the T6302L type SBS modifier of China petroleum soliton petrochemical company, respectively, and heating to 180℃and shearing at 12000rpm/min for 15min using FLUKOFM300 shearing machine. Then 0.6 per mill (0.9 g) WD-2 stabilizer of Clamamanite Limited liability company is added into the first mixture, heated and kept at 190 ℃, stirred, and reacted for 6 hours to obtain samples to be tested, the samples being numbered from sample 8 to sample 11.
(2) Preparing a test piece to be tested: same as in example 11.
(3) Testing high-temperature performance of a sample to be tested and processing data: same as in example 11.
In addition, the softening point, rotational viscosity, rutting factor of samples 5 to 7 were tested in the same manner as in example 11, and the test result and the shear coefficient S obtained by the SBS modified asphalt high temperature performance evaluation method of the present invention c See table 5.
As can be seen from table 5, in samples 8 to 11, when the SBS modifier usage increased from 4.0% to 4.3%, 4.7% and 5.0%, the rotational viscosity at 135 ℃ and the rutting resistance factor of the SBS modified asphalt increased gradually, and the shear coefficient decreased gradually, indicating that the high temperature performance of the SBS modified asphalt became better gradually. Compared with the technical indexes of rotational viscosity at 135 ℃, rutting resistance factor and shearing resistance coefficient, the test result of the asphalt softening point test method in the embodiment is not identical with the test result of the other three technical indexes.
Example 14:
(1) preparation of samples 12 to 15:
96% (1440 g) of road asphalt No. 90 of China Clarituxite Limited company was mixed with 4.0% (60 g) of T6302L type SBS modifier of China Petroleum Dushan petrochemical Co Ltd, heated to 180℃and sheared at 12000rpm/min for 15min using FLUKOFM300 shearing machine to prepare a first mixture. And then 0.6 per mill (0.9 g), 0.8 per mill (1.2 g), 1.0 per mill (1.5 g) and 1.2 per mill (1.8 g) of WD-2 stabilizer of the middle petroleum and cramar petrochemical company of Limited are respectively added into the four first mixtures with the same proportion, and the mixture is heated and kept at the constant temperature to 190 ℃ and stirred for 6 hours to prepare samples to be tested, wherein the samples are numbered from sample 12 to sample 15.
(2) Preparing a test piece to be tested: same as in example 11.
(3) Testing high-temperature performance of a sample to be tested and processing data: same as in example 11.
In addition, the softening point, rotational viscosity, rutting factor of samples 5 to 7 were tested in the same manner as in example 11, and the test result and the shear coefficient S obtained by the SBS modified asphalt high temperature performance evaluation method of the present invention c See table 6.
Example 15:
(1) preparation of samples 16 to 20:
95.7% (1435.5 g) of 90 # road asphalt of China petroleum Yunnan petrochemical Co., ltd was mixed with 4.3% (64.5 g) of T6302H type SBS modifier of China petroleum Dushan petrochemical Co., ltd and heated to 180℃and sheared for 15min at 12000rpm/min by using FLUKOFM300 shearing machine to prepare a first mixture. Then, 1.5%o (2.25 g) of WD-2 stabilizer of Clamamanite Limited liability company was added to the first mixture, heated and kept at a constant temperature of 195℃and stirred to react for 2.5 hours, 3.5 hours, 4.5 hours, 5.5 hours and 6.5 hours, respectively, to prepare samples to be tested, which were numbered from sample 16 to sample 20.
(2) Preparing a test piece to be tested: same as in example 11.
(3) Testing high-temperature performance of a sample to be tested and processing data: same as in example 11.
In addition, the softening point, rotational viscosity, rutting factor of samples 16 to 20 were measured by the same method as in example 11, and the test result and the shear coefficient S obtained by the SBS modified asphalt high temperature performance evaluation method of the present invention c See table 7.
In tables 6 and 7, the test results of samples 12 to 15 and samples 16 to 20 show that, as the usage amount of the stabilizer is gradually increased, the reaction time is gradually prolonged, the softening point, the rotational viscosity at 135 ℃ and the rutting resistance factor of the SBS modified asphalt are gradually increased, and the shearing resistance coefficient is gradually reduced, so that the high-temperature performance of the SBS modified asphalt is regularly and gradually improved, and the high-temperature performance evaluation method of the SBS modified asphalt has high consistency with the traditional evaluation method.
From the aspect of instrument precision, the temperature control precision of the dynamic shear rheometer adopted by the invention can reach 0.1 ℃, the test frequency is accurate to 0.1rad/s, the strain amplitude is accurate to 0.1%, the action stress is accurate to 0.01N, and the precision is higher. From the test process, the invention has few test steps, and only the preparation process of the test die is influenced by human factors, so that the reliability of the test is higher. From the test results, the SBS modified asphalt has higher sensitivity to the change of the action stress, and can accurately represent the response of the SBS modified asphalt to the loading stress, so that the high-temperature performance of the SBS modified asphalt can be accurately evaluated. In contrast, the traditional asphalt softening point test (ring ball method) T0606-2011, asphalt rotational viscosity test (Brookfield viscometer method T0625-2011) and asphalt rheological property test (dynamic shear rheometer method T0628-2011) are adopted to evaluate the high temperature performance of the SBS modified asphalt, and the loading mode and the stress mode of a sample to be tested are difficult to simulate the action process of a real vehicle on an actual pavement in the test process, so that the high temperature performance of the SBS modified asphalt is difficult to evaluate accurately.
In summary, the invention provides a high-temperature performance evaluation method of SBS modified asphalt, which has higher sensitivity to the change of acting stress according to the SBS modified asphalt, and can accurately represent the response of the SBS modified asphalt to loading stress, so that the high-temperature performance of the SBS modified asphalt can be accurately evaluated, the operation steps are simple, precise and accurate, the method has higher precision and reliability, and the method can be widely applied to the fields of SBS modified asphalt quality detection, formula research, production and processing, construction application and the like.
The technical characteristics form the embodiment of the invention, have stronger adaptability and implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (6)
1. A method for evaluating the high-temperature performance of SBS modified asphalt is characterized by comprising the following steps:
s1, respectively applying stress sigma by adopting a dynamic shear rheometer at the required test temperature 1 、σ 2 Continuously performing repeated creep test on the sample to be tested to obtain the acting stress sigma of the sample to be tested 1 、σ 2 Cumulative strain ε under 1i 、ε 2j The test temperature is 52-82 ℃, and the action stress sigma 1 、σ 2 0.05KPa to 1.0KPa, 3.0KPa to 6.0KPa, respectively, the repeated creep test being a continuous in-service stress sigma 1 、σ 2 Respectively carrying out repeated tests of 10 cycles, wherein each cycle is divided into a loading creep stage of 1s and an unloading recovery stage of 9s, the total test time is 200s, and the action stress sigma of the sample to be tested is obtained 1 、σ 2 Cumulative strain ε after the i and j th stresses under 1i 、ε 2j Wherein i=1, 2, 3..9, 10, j=1, 2, 3..9, 10;
s2, accumulating strain epsilon 1i 、ε 2j Performing linear regression on the times of action in the repeated creep test to obtain the slope K of the curve after linear regression σ1 、K σ2 ；
S3, according to the slope K σ1 、K σ2 Calculating to obtain the shearing resistance coefficient S of the sample to be measured c According to the obtained shearing resistance coefficient S c Evaluating the high temperature performance of SBS modified asphalt; shear coefficient S of the sample to be tested c Calculated as follows:
1 (1)
Wherein S is c To be the shearing resistance coefficient, K of the sample to be tested σ1 、K σ2 Respectively, cumulative strain epsilon 1i 、ε 2j Slope of the action frequency curve, A is a coefficient; the Sc value of the shearing resistance coefficient is inversely related to the high-temperature performance of the SBS modified asphalt.
2. The method for evaluating the high-temperature performance of the SBS modified asphalt according to claim 1, wherein in the step S1, the preparation of a sample test piece to be tested in the creep test is repeated, and the method comprises the following steps: and (3) carrying out constant-temperature sample stirring on the SBS modified asphalt sample at a required sample melting temperature, pouring a 25mm parallel plate test die after the sample is uniform and bubbles are removed, and cooling to normal temperature to prepare a sample test piece to be tested for later use, wherein the sample melting temperature is 150-180 ℃, and the sample melting time is 0.5-2.5 h.
3. The method for evaluating the high-temperature performance of the SBS modified asphalt according to claim 2, wherein the sample melting temperature is 160-170 ℃, and the sample melting time is 1.0-1.5 h.
4. The method for evaluating high-temperature performance of SBS-modified asphalt according to claim 1, wherein in step S1, the test temperature is 64 ℃ to 76 ℃, and the stress sigma is applied 1 、σ 2 0.1KPa to 0.5KPa, 4.0KPa to 5.0KPa, respectively.
5. The method for evaluating high-temperature performance of SBS modified asphalt according to claim 1, wherein in step S1, the test temperature is 64 ℃; or/and, the test temperature is 70 ℃; or/and, the test temperature was 76 ℃.
6. The method for evaluating the high-temperature performance of SBS modified asphalt according to claim 1, wherein when the test temperature is 70 ℃ and the coefficient A is 0.001, the high-temperature performance of SBS modified asphalt is classified into the following five grades according to the Sc value of the shearing resistance coefficient:
when the shearing resistance coefficient S of the sample to be tested c When the performance grade is less than or equal to 5, the performance grade is first grade;
when the shearing resistance coefficient of the sample to be tested is 5 < S c When the performance grade is less than or equal to 20, the performance grade is two-stage;
when the shearing resistance coefficient of the sample to be tested meets 20 < S c When the performance grade is less than or equal to 50, the performance grade is three-grade;
when the shearing resistance coefficient of the sample to be tested meets 50 < S c When the performance grade is less than or equal to 100, the performance grade is four grades;
when the shearing resistance coefficient of the sample to be tested meets S c At > 100, the performance rating is five.
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