CN110988314A - SBS modified asphalt functionalization effect evaluation method based on viscous flow activation energy - Google Patents
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- 239000010426 asphalt Substances 0.000 title claims abstract description 239
- 230000000694 effects Effects 0.000 title claims abstract description 25
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- 239000002131 composite material Substances 0.000 claims description 14
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- 230000004048 modification Effects 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- GJKZSOHUVOQISW-UHFFFAOYSA-N buta-1,3-diene;2-methylbuta-1,3-diene;styrene Chemical compound C=CC=C.CC(=C)C=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 GJKZSOHUVOQISW-UHFFFAOYSA-N 0.000 claims 1
- 239000002086 nanomaterial Substances 0.000 claims 1
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 8
- 238000011160 research Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract 1
- FACXGONDLDSNOE-UHFFFAOYSA-N buta-1,3-diene;styrene Chemical compound C=CC=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 FACXGONDLDSNOE-UHFFFAOYSA-N 0.000 description 120
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 114
- 101100518501 Mus musculus Spp1 gene Proteins 0.000 description 22
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- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
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- SYHGEUNFJIGTRX-UHFFFAOYSA-N methylenedioxypyrovalerone Chemical compound C=1C=C2OCOC2=CC=1C(=O)C(CCC)N1CCCC1 SYHGEUNFJIGTRX-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a method based on viscous flow activation energy (E)a) Belonging to the technical field of road engineering. Aiming at the characteristic that SBS is easy to age, the invention prepares a series of SBS functionalized modified asphalt with optimized structure to age in different modes, and tests the rheological property. By EaEvaluating the functionalization effect and the ageing resistance of SBS modified asphalt and utilizing EaAmplitude (AI) and E ofaAnd the correlation with the construction temperature guides the construction of the functional SBS modified asphalt. The method can effectively avoid the aging of the asphalt caused by overhigh temperature selection in the processing process, and designs the material of the SBS modified asphalt,The research on the ageing resistance and the reasonable selection of the mixing and compacting temperature of the asphalt provide a new method, and the pavement performance of the asphalt pavement is indirectly improved.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to a viscous flow activation energy (E)a) An evaluation method for the functionalized effect of the SBS modified asphalt with the optimized structure.
Background
In order to improve the road performance of asphalt pavement, it is a trend to add modified materials to the base asphalt. Styrene-butadiene-styrene (SBS) and base asphalt form a two-phase continuous three-dimensional network structure, changes the rheological property and mechanical property of the asphalt, and is one of the most commonly used polymer modifiers. However, SBS containing unsaturated double bonds is prone to aging, affecting the durability of asphalt pavement. Therefore, optimizing the chemical structure of SBS is an effective way to improve the performance of SBS modified asphalt and improve the durability of asphalt pavement. The temperature sensitivity and the ageing resistance of the SBS modified asphalt can be improved through SBS functionalization. The hydrogenated derivative of SBS, styrene-ethylene/butylene-styrene block copolymer (SEBS), maleic anhydride to graft modify SEBS (SEBS-g-MAH), and SBS and organic montmorillonite composite modified asphalt (SBS/OMMT) improve the compatibility of SBS and asphalt components, and can also relieve thermal oxidation aging of SBS modified asphalt and improve the aging resistance of SBS modified asphalt.
The temperature sensitivity of asphalt is one of the important indicators for evaluating the use performance of asphalt. Temperature sensitivity indexes such as a penetration index PI, a penetration viscosity index PVN, a viscosity-temperature index VTS and the like are generally expressed by the behavior of viscosity along with temperature, but the indexes cannot sufficiently reflect the service performance of the asphalt in the whole temperature range from low temperature to high temperature, and simultaneously have the problem of inadaptation to modified asphalt. Different requirements are put on the temperature sensitivity of the asphalt in different use stages of the asphalt. EaThe method has strong correlation with the thermal sensitivity of the asphalt, and the linear regression is carried out according to the chemical reaction kinetic theory and the asphalt viscosity in a temperature interval, so that the method not only has high accuracy, but also is suitable for all asphalt. By using EaThe functional performance of the functional SBS modified asphalt can be better evaluated according to the relation between the asphalt temperature sensitivity. Meanwhile, the judgment of the aging degree of the asphalt is an important reference basis for evaluating the performance of the asphalt. E of asphaltaIncreases with increasing degree of aging, EaCan be used as an index for quantitatively evaluating the aging resistance of the asphalt. The polymer modified asphalt can be processed by overheating during construction, which leads to excessive aging of the asphalt. Therefore, it is crucial to select the mixing and compacting temperatures of the modified asphalt properly for practical production and construction. Quantitative study EaThe method has better correlation with the construction temperature, guides construction, saves energy consumption and reduces the aging of SBS modified asphalt.
The invention researches different functional SBS changesRheological properties of the bitumen under different aging conditions. By E in different temperature intervalsaAnd the research on temperature sensitivity accurately evaluates the high-temperature rheological property, the construction workability and the ageing resistance of the functionalized SBS modified asphalt. The method provides a new idea for material design and aging resistance research of SBS modified asphalt and reasonable mixing and compaction temperature selection of asphalt, and can indirectly improve the road performance of asphalt pavement.
Disclosure of Invention
The invention aims to provide a method based on EaThe method for evaluating the functionalization effect of SBS modified asphalt. Selecting SBS series modified asphalt systems (SEBS, SEBS-g-MAH and SBS/OMMT composite modification), obtaining viscosities of different temperature ranges with different aging degrees according to a rotational rheological test (RV) and a dynamic shear rheological test (DSR), and obtaining E of modified asphalt with different modification modes, different temperature ranges and different aging states according to an Arrhenius equationa. By using EaAnd evaluating the selection of the construction temperature of the high-temperature performance and the anti-aging performance of the functional SBS modified asphalt according to the relation with the asphalt temperature sensitivity.
The invention provides a method based on EaThe SBS modified asphalt functionalization effect evaluation method comprises the following steps:
(1) aiming at the characteristic that SBS is easy to age, a series of SBS modified asphalt with optimized structure is prepared, and the modified asphalt is aged in different modes;
(2) and DSR: carrying out temperature scanning on the functionalized SBS modified asphalt in different aging modes by adopting a dynamic shear rheometer to measure a complex modulus (G) and a phase angle (delta);
(3) based on G and delta, the viscosity of the functionalized SBS modified asphalt in different aging modes within the DSR test temperature range is obtained by conversion according to equation (1):
in the formula (1), ω is the loading frequency, 10 rad/s.
(4) RV: measuring the viscosity values of the functional SBS modified asphalt at different temperatures in different aging modes by adopting a rotary viscometer;
(5) respectively calculating the E of the functionalized SBS modified asphalt in the RV test temperature range and the DSR test temperature range under different aging modes according to the Arrhenius equation in the equation (2)aThe ln η -1/T is plotted by Origin software, and the slope and intercept obtained by linear regression represent E in equation (3)aThe slope is multiplied by the universal gas constant (8.314J/(mol.k)) to obtain Ea；
Equation (2) can be linearized by taking the following natural logarithm:
in the formula (3), A is a pre-exponential factor; eakJ. mol as viscous flow activation energy-1(ii) a T is absolute temperature, K; r is the general gas constant, 8.314J/(mol.k).
(6) Calculating to obtain the E of the functional SBS modified asphalt in different aging modes in different temperature ranges according to the equation (3)aBy using EaAnd the high-temperature rheological property and the construction workability of the functionalized SBS modified asphalt are evaluated by linking with the asphalt temperature sensitivity.
(7) Functional SBS modified asphalt E under different aging modesaThe amplification of (2) is defined as an Aging Index (AI), and the aging resistance of different functionalized SBS modified asphalt is evaluated according to the equation (4);
in the formula (4), AI is an aging index;
as unaged bitumen Ea；
As E of aged bitumena。
Preferably, the different kinds of modifiers in the step (1) comprise SBS, SEBS-g-MAH and SBS/OMMT composite modification;
preferably, the different ways of aging in step (1) include RTFOT, PAV and UV aging;
preferably, in the step (2), a dynamic shear rheometer is used for temperature scanning to measure G and delta at 52-82 ℃;
preferably, said base is based on EaThe SBS modified asphalt functionalization effect evaluation method is characterized in that rotational viscosity tests in the step (4) respectively measure rotational viscosity values at 80 ℃, 90 ℃, 100 ℃, 135 ℃ and 175 ℃;
preferably, said base is based on EaThe SBS modified asphalt functionalization effect evaluation method is characterized in that E in the step (6)aThe relationship with the temperature sensitivity of the asphalt is EaThe larger the temperature sensitivity of the asphalt is, the smaller the temperature sensitivity of the asphalt is, the high-temperature stability of the asphalt is facilitated, but the workability of construction is not facilitated; at the same time, using EaCorrelation with construction temperature further discussion EaAnd (5) guidance for the construction of SBS series modified asphalt.
Preferably, said base is based on EaThe method for evaluating the functionalization effect of the SBS modified asphalt is characterized in that the functionalized SBS modified asphalt comprises a series of SBS functionalized modified asphalt such as SBS, SEBS-g-MAH and SBS/OMMT composite modified asphalt. For the selection of SBS functional modified asphalt, when E is adoptedaWhen the asphalt material with the ratio of 90kJ/mol or more and the AI of 10% or less is put into use, the service life of the asphalt pavement can be greatly prolonged. For the construction guidance of SBS functional modified asphalt, when EaThe mixing and compacting temperatures are controlled to be 175-185 ℃ and 150 ℃ respectively in the ranges of 80kJ/mol and 65 kJ/mol; when E isaIn the range of 80kJ/mol or less and 65kJ/mol or less, respectively, 175 ℃ or less and 150 ℃ or less, corresponding to the kneading temperature, are blended.
Compared with the existing asphalt performance evaluation method, the method has the beneficial effects that:
(1) the invention provides a base EaThe functional effect evaluation method of the SBS modified asphalt aims at researching the rheological property and the aging property of the functional SBS modified asphalt and adopts the E of the functional SBS modified asphalt in different aging modesaAnd the high-temperature rheological property, the ageing resistance and the construction workability of the functionalized SBS modified asphalt are evaluated according to the relationship among the temperature sensitivity and the construction temperature. Relating the temperature sensitivity of SBS modified asphalt to the use performance of asphalt, and using EaAs the evaluation index of the SBS modified asphalt functionalization effect, the evaluation result is reliable;
(2) by comparing E of functionalized SBS modified asphalt under different aging degreesaThe functionalization effect of the SBS modified asphalt can be evaluated. By evaluating the construction workability and the road performance of the functionalized SBS modified asphalt, theoretical guidance is provided for material design and use of the functionalized SBS modified asphalt and research on asphalt anti-aging performance, effective information is provided for pertinently adopting corresponding anti-aging measures, and the durability of the asphalt pavement is indirectly improved.
Drawings
FIG. 1 is a plot of an ln η -1/T linear regression of the matrix asphalt in different aging modes in example 1 over the respective temperature ranges for RV and DSR tests;
FIG. 2 is a linear regression plot of ln η -1/T for SBS modified asphalt at different aging modes in example 2 over the temperature ranges for RV test and DSR test, respectively;
FIG. 3 is a linear regression graph of ln η -1/T of SEBS modified asphalt in different aging modes in example 3 at the temperature ranges of RV test and DSR test respectively;
FIG. 4 is a linear regression plot of ln η -1/T for the ranges of RV test and DSR test for SEBS-g-MAH modified asphalt in different aging modes in example 4;
FIG. 5 is a plot of the ln η -1/T linear regression of SBS/OMMT modified asphalt in the RV test and DSR test ranges for different aging modes in example 5;
FIG. 6 shows different aging modes in example 6E of the base asphalt and the functionalized SBS modified asphalt in the RV test temperature rangea；
FIG. 7 is E of the unaged base asphalt and functionalized SBS modified asphalt of example 7aCorrelation with the mixing temperature of the asphalt mixture;
FIG. 8 is E of the unaged base asphalt and functionalized SBS modified asphalt of example 7aCorrelation with asphalt compaction temperature.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The invention provides a method based on EaThe SBS modified asphalt functionalization effect evaluation method comprises the following steps:
(1) respectively adding different modifiers into the matrix asphalt to prepare a series of functionalized SBS modified asphalt;
(2) respectively carrying out RTFOT, PAV and UV aging on the functionalized SBS modified asphalt;
(3) and DSR: scanning the temperature of the functionalized SBS modified asphalt in the step (2) by using a dynamic shear rheometer, and measuring G and delta of the functionalized SBS modified asphalt in different aging modes within the temperature range of 52-82 ℃;
(4) converting the G and the delta of the functionalized SBS modified asphalt obtained by the DSR test in the step (3) in different aging modes according to an equation (1) to obtain the viscosity of the functionalized SBS modified asphalt in different aging modes;
(5) RV: measuring the rotational viscosity values of the functionalized SBS modified asphalt in the step (2) at 5 temperatures of 80, 90, 100, 135 and 175 ℃ by using a rotational viscometer;
(6) respectively calculating the temperature range of the functional SBS modified asphalt under different aging modes and the DSR test according to the Arrhenius equation in the equation (2)Temperature range EaThe ln η -1/T graph is plotted, and the slope and intercept obtained by linear regression represent E in equation (3)aThe slope is multiplied by the universal gas constant (8.314J/(mol.k)) to obtain EaThen, the equation (2) is linearized to obtain the equation (3) to carry out EaThe calculation of (2):
(7) calculating to obtain the E of the modified asphalt under different aging modes according to the equation (3)aBy using EaThe high-temperature rheological property and the construction workability of the functionalized SBS modified asphalt are evaluated according to the relation between the asphalt temperature sensitivity and the construction temperature;
(8) functional SBS modified asphalt E under different aging modesaThe increase of (a) is defined as the Aging Index (AI), and the aging resistance of the different functionalized SBS modified asphalts is evaluated according to equation (4).
The invention is further described with reference to the following figures and specific examples.
Example 1
The ln η -1/T linear regression results for the base asphalt in different aging modes based on the RV test and DSR test temperature ranges using the base asphalt as a control group for the functionalized SBS modified asphalt are shown in table 1.
TABLE 1 Linear regression results of ln η -1/T for base asphalt in different aging modes
Note: VG is unaged asphalt, RTFOT is short-term aged asphalt, PAV is long-term aged asphalt, UV is ultraviolet aged asphalt, and the following is the same as the above.
FIG. 1 is a plot of an ln η -1/T linear fit of a base asphalt at different aging regimes based on RV and DSR test temperature ranges with a slope magnitude reflecting the E of the base asphalta. As can be seen from Table 1 and FIG. 1, E for the unaged base asphalta(RV test) was only 77.19kJ/mol, and E of the base asphalt was found to be high under short-term aging, long-term aging and UV aging in the temperature range of RV test and DSR testaThe temperature of the asphalt increases in different ranges along with the increase of the aging degreeThe sensitivity decreases.
Example 2
The ln η -1/T linear regression results of SBS modified asphalt (4.5 wt% SBS) under different aging modes based on RV test and DSR test temperature ranges are shown in Table 2.
TABLE 2 SBS modified asphalt ln η -1/T linear regression results under different aging modes
FIG. 2 is a plot of an ln η -1/T linear fit of SBS modified asphalt at different aging regimes based on RV and DSR test temperature ranges with slope magnitudes reflecting the E of SBS modified asphalta. As can be seen from Table 2 and FIG. 2, the E of the SBS modified asphalt was found to be short term aged, long term aged and UV aged in the RV test and DSR test temperature rangesaThe temperature sensitivity of the asphalt is reduced as the aging degree is increased in different ranges.
From Table 2(RV test), it can be seen that E of the unaged SBS-modified asphalta84.03kJ/mol, EaLarger means that the SBS modified asphalt needs more energy to generate flow, and the heat energy generated by higher construction temperature can deepen the aging degree and is not beneficial to the construction workability. Compared with the matrix asphalt, the SBS modified asphalt has improved high-temperature stability and ageing resistance.
Example 3
The linear regression results of ln η -1/T of SEBS modified asphalt (4.5 wt% SEBS) based on different aging modes of RV test and DSR test temperature ranges are shown in Table 3.
TABLE 3 SEBS modified asphalt ln η -1/T linear regression results under different aging modes
FIG. 3 is a plot of ln η -1/T linear fit of SEBS modified asphalt under different aging modes based on RV test and DSR test temperature ranges, and the slope magnitude reflects the E of the SEBS modified asphalta. As can be seen from Table 3 and FIG. 3, the E of the SEBS-modified asphalt was determined under short-term aging, long-term aging and ultraviolet aging in the temperature range of RV test and DSR testaThe temperature sensitivity of the asphalt is reduced as the aging degree is increased in different ranges.
As can be seen from Table 3(RV test), E of the unaged SEBS-modified asphaltaIs 90.98kJ/mol, EaLarger means that the SEBS modified asphalt needs more energy to generate flow, and the heat energy generated by higher construction temperature can deepen the aging degree and is not beneficial to the construction workability. Compared with the matrix asphalt and the SBS modified asphalt, the SEBS modified asphalt has obviously improved high-temperature stability and ageing resistance, and shows that the SEBS functional effect is good.
Example 4
The linear regression results of ln η -1/T of SEBS-g-MAH modified asphalt (4.5 wt% SEBS-g-MAH) based on different aging modes of RV test and DSR test temperature ranges are shown in Table 4.
TABLE 4 SEBS-g-MAH modified asphalt ln η -1/T linear regression results under different aging modes
FIG. 4 is an ln η -1/T linear fitting graph of SEBS-g-MAH modified asphalt under different aging modes based on RV test and DSR test temperature ranges, and the slope of the linear fitting graph reflects the E of the SEBS-g-MAH modified asphalta. As can be seen from Table 4 and FIG. 4, the E of the SEBS-g-MAH modified asphalt under short-term aging, long-term aging and ultraviolet aging in the temperature range of RV test and DSR testaAppear as the aging degree increasesThe temperature sensitivity of the asphalt decreases with different increases.
As shown in Table 4(RV test), E of the unaged SEBS-g-MAH-modified asphalta(RV test) 81.00kJ/mol, EaThe SEBS-g-MAH modified asphalt is larger, which means that more energy is needed for flowing, and the heat energy generated by higher construction temperature can deepen the aging degree, thus being not beneficial to the construction workability. Compared with the matrix asphalt, the SEBS-g-MAH modified asphalt has improved high-temperature stability and ageing resistance, and general SEBS-g-MAH functional effect.
Example 5
The compatibility of the asphalt and SBS is improved because the surface of the organically modified montmorillonite is covered by the alkyl long chain on the organic ion, the addition of OMMT reduces the cracking of SBS molecular chain, and blocks the negative effect of thermal oxidation on the asphalt, so that the anti-aging performance is greatly improved, the linear regression results of ln η -1/T of SBS/OMMT composite modified asphalt (SBS: OMMT ═ 1:5, 4.5 wt% SBS) based on different aging modes of RV test and DSR test temperature range are shown in Table 5.
TABLE 5 SBS/OMMT composite modified asphalt ln η -1/T linear regression results under different aging modes
FIG. 5 is a plot of ln η -1/T linear fits of SBS/OMMT composite modified asphalt at different aging modes based on RV and DSR test temperature ranges, with slope magnitude reflecting E of SBS/OMMT composite modified asphalta. As can be seen from Table 5(DSR test) and FIG. 5, the E of the SBS/OMMT composite modified asphalt is within the temperature range of the DSR testaAnd does not increase with increasing age. The intercalation structure formed by SBS/OMMT effectively blocks the action of hot oxygen, reduces the oxidation of asphalt and improves the ageing resistance. As can be seen from Table 5(RV test) and FIG. 5, the E of the SBS/OMMT composite modified asphalt is determined under short-term aging, long-term aging and ultraviolet aging in the RV test temperature rangeaThe aging degree increases in different rangesThe temperature sensitivity of cyan decreases.
From Table 5(RV test), the E of the unaged SBS/OMMT-modified asphaltaIs 90.97kJ/mol, EaThe larger the size, means that the SBS/OMMT composite modified asphalt needs more energy to generate flow, and the higher construction temperature generates heat energy which can result in the deepening of the aging degree and is not beneficial to the workability of construction. Compared with the matrix asphalt and the SBS modified asphalt, the high-temperature stability and the ageing resistance of the SBS/OMMT modified asphalt are obviously improved, which shows that the SEBS/OMMT functional effect is good.
As can be seen from FIG. 6, the E of the SEBS-modified asphalt is obtained under 3 aging modes of RTFOT, PAV and UVaThe most important is the SBS/OMMT composite modified asphalt, the SBS modified asphalt, the SEBS-g-MAH modified asphalt and the E of the matrix asphaltaAt a minimum, this is the most sensitive to temperature changes. The SBS functional effect of the SEBS and SBS/OMMT modified asphalt is best, and the temperature sensitivity, the high-temperature rheological property and the aging resistance are obviously improved.
Example 6
The aging resistance of SBS functionalization is analyzed through calculation of AI of asphalt under RTFOT aging and UV aging, and as can be seen from Table 6, the AI is from large to small, BASE < SEBS-g-MAH < SBS < SEBS < SBS/OMMT, and the smaller the AI is, the better the aging resistance is, so that the better the aging resistance of SBS/OMMT composite modified asphalt is, and the worse the aging resistance of the BASE asphalt is, and the next is SEBS, SBS and SEBS-g-MAH modified asphalt. The AI of the modified asphalt under PAV aging is obviously larger because the network structure in the modified asphalt completely loses efficacy due to long-term aging, and the degradation of the functionalized SBS polymer molecules and the aging of the matrix asphalt are carried out simultaneously, so that the AI of the modified asphalt is obviously increased and even is larger than that of the matrix asphalt.
For the choice of pavement material, E is chosen so as to be sufficiently insensitive to temperature changes during use of the asphalt pavement to effectively mitigate the aging of the asphaltaThe SBS functional asphalt material with the value of more than or equal to 90kJ/mol and the AI value of more than or equal to 10 percent can effectively improve the durability of the asphalt pavement. By using EaNot only can reasonably evaluate the service performance of the SBS functionalized modified asphalt, but also can evaluate the anti-aging performance of the SBS series modified asphalt,therefore, the asphalt pavement material is correctly selected and the SBS functionalization effect is accurately evaluated.
TABLE 6 AI after aging of functionalized SBS modified asphalt
Example 7
The mixing and compacting temperature of the functionalized SBS modified asphalt obtained through the viscosity-temperature curve meets the construction temperature requirement of the polymer modified asphalt. As can be seen from FIGS. 7 and 8, E of the functionalized SBS modified asphaltaThe larger the mixing and compacting temperatures are. EaAnd the construction temperature, so that the construction of the asphalt is guided by using the correlation. Combining the recommended construction temperature of the polymer modified asphalt to obtain E with the recommended mixing temperature range (175-185 ℃) of the functionalized SBS modified asphaltaE in the range of 80 to 100kJ/mol and a compaction temperature of ≧ 150 ℃ is recommendeda≧ 65 kJ/mol. Thus, if EaRespectively in the range of 80-100 kJ/mol and ≧ 65kJ/mol, and the mixing and compacting temperatures are correspondingly controlled in the range of 175-185 ℃ and ≧ 150 ℃; if EaIn the range of 80kJ/mol or less and 65kJ/mol or less, respectively, 175 ℃ or less and 150 ℃ or less, corresponding to the kneading temperature, are blended. By using EaThe construction of the functional SBS modified asphalt mixture is guided, and unnecessary additive and asphalt aging and energy waste are avoided.
By modifying asphalt E with functionalized SBSaAnalysis of (E)aThe method can evaluate the high-temperature stability, the aging resistance and the construction workability of the SBS series modified asphalt, and provides a new idea for the functional evaluation of the SBS series modified asphalt, the aging resistance evaluation of the asphalt and the guidance of construction.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. It will be apparent to those skilled in the art that various modifications and changes may be made without departing from the spirit and scope of the invention.
Claims (6)
1. Based on viscous flow activation energy (E)a) The SBS modified asphalt functionalization effect evaluation method is characterized by comprising the following steps:
(1) aiming at the characteristic that SBS is easy to age, a series of functionalized SBS modified asphalt is prepared;
(2) carrying out short-term aging (rotary film oven test, RTFOT), long-term aging (pressure aging test, PAV) and ultraviolet aging (UV) on the modified asphalt obtained in the step (1);
(3) performing rheological property test on the functionalized SBS modified asphalt in the step (2) in different temperature ranges;
(4) calculating the E of the functionalized SBS modified asphalt according to the rheological parameters measured in the step (3)a；
(5) By using EaEvaluating the rheological property of the functionalized SBS modified asphalt;
(6) by using EaEvaluating the construction workability of the functionalized SBS modified asphalt;
(7) by using EaAnd evaluating the ageing resistance of the functionalized SBS modified asphalt.
2. The E-based of claim 1aThe SBS modified asphalt functionalization effect evaluation method is characterized in that the rheological property tests in the step (3) at different temperature ranges comprise dynamic shear rheological tests (DSR), rotational viscosity tests (RV) and other related tests.
3. The E-based of claim 1aThe method for evaluating the functionalization effect of SBS modified asphalt is characterized in that the step (5) utilizes EaThe rheological property of the functionalized SBS modified asphalt is evaluated to pass through EaAnd the relationship between the temperature sensitivity and the asphalt temperature sensitivity evaluates the high-temperature rheological property of the functionalized SBS modified asphalt.
4. The E-based of claim 1aThe method for evaluating the functionalization effect of SBS modified asphalt is characterized in that the step (6) of utilizing EaEvaluation of workability of functionalized SBS modified asphaltTo pass through EaAnd the construction condition of the SBS modified asphalt is evaluated according to the relation between the SBS modified asphalt and the construction temperature.
5. The E-based of claim 1aThe method for evaluating the functionalization effect of SBS modified asphalt is characterized in that the step (7) of utilizing EaThe anti-aging performance of the functionalized SBS modified asphalt is evaluated by E before and after the asphalt is agedaAnd (Al) amplification (Aging Index, AI for short), evaluating the Aging resistance of the functionalized SBS modified asphalt:
in the formula (1), AI is an aging index;
as unaged bitumen Ea；
As E of aged bitumena。
6. The E-based of claim 1aThe method for evaluating the functionalization effect of the SBS modified asphalt is characterized in that the functionalized SBS modified asphalt comprises a series of SBS functionalized modified asphalt such as SBS, hydrogenated derivatives (SEBS) of SBS, SEBS-g-MAH (styrene-butadiene-styrene-isoprene) grafted modification by maleic anhydride, SBS and nano material composite modification (SBS/OMMT).
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