CN115479884A - Test and evaluation method considering influence of freeze thawing and aging on asphalt mixture performance - Google Patents
Test and evaluation method considering influence of freeze thawing and aging on asphalt mixture performance Download PDFInfo
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Abstract
A test and evaluation method considering the influence of freeze thawing and aging on the performance of an asphalt mixture belongs to the technical field of engineering materials, and the specific scheme comprises the following steps: preparing an asphalt mixture test piece; determining freeze-thaw cycle and aging test parameters; performing an aging test in the thawing process of the freeze-thaw cycle; carrying out a frequency scanning test on the asphalt mixture test piece subjected to the freeze-thaw cycle and aging test to obtain a change curve of the complex modulus of the asphalt mixture along with the loading frequency; and fitting the obtained complex modulus change curve along with the loading frequency by using a theoretical formula of the complex modulus, and defining high-temperature stability influence parameters and low-temperature crack resistance influence parameters GW (n, t) and DW (n, t), wherein the larger the values of GW (n, t) and DW (n, t) are, the larger the influence of freeze-thaw cycle and aging on the durability of the asphalt mixture is, the more unstable the performance of the asphalt mixture is and the poorer the durability is.
Description
Technical Field
The invention belongs to the technical field of engineering materials, and particularly relates to a test and evaluation method considering the influence of freeze thawing and aging on the performance of an asphalt mixture.
Background
Asphalt mixtures are an important pavement material. Due to the existence of asphalt in the asphalt mixture composition material, the material performance of the asphalt mixture has higher temperature sensitivity. The properties of asphalt mixes are closely related to temperature. This correlation includes two main aspects, namely high temperature stability and low temperature crack resistance. The high-temperature stability means that the asphalt mixture cannot be too soft in high-temperature seasons in summer, can resist the action of vehicle load and cannot generate track diseases; the low-temperature crack resistance means that the asphalt mixture cannot be too hard in winter in low-temperature seasons, and the asphalt mixture has certain deformability at low temperature so as not to cause crack diseases. Therefore, in evaluating the performance of asphalt mixtures, both high temperature stability and low temperature crack resistance should be considered.
The asphalt mixture in the actual service period is greatly influenced by external environmental factors, and the influence of the environmental factors mainly comprises two aspects, namely, the freeze-thaw cycle effect caused by high-temperature and low-temperature alternation; secondly, the aging of the asphalt material is caused by the action of high temperature and ultraviolet rays. The effects of these two effects are long-lasting and simultaneous during the service life of the asphalt mix. The freeze-thaw cycle and the aging effect can cause damage to the structure and the material of the asphalt mixture, affect the high-temperature stability and the low-temperature crack resistance of the asphalt mixture and further affect the durability of the asphalt mixture, so that the influence of the freeze-thaw cycle and the aging effect on the durability of the asphalt mixture can be comprehensively analyzed only by considering the high-temperature stability and the low-temperature crack resistance at the same time. At present, the following problems mainly exist in the aspects of durability test research and evaluation of the asphalt mixture. Problem 1: there is no simultaneous consideration of the freeze-thaw cycles and aging effects for both aspects of durability. At present, the freeze-thaw cycle and the aging effect are considered separately under the general condition, namely the freeze-thaw cycle and the aging effect are respectively tested and researched. In fact, the freeze-thaw cycle and the aging effect are both present and the two effects interact with each other, for example, cracks caused by the freeze-thaw cycle may further exacerbate the aging effect. Problem 2: the aging effect includes two aspects: thermal aging and ultraviolet aging. At present, the two aging effects are generally considered separately, namely, the thermal aging effect and the ultraviolet aging effect are considered separately. The actual heat aging and ultraviolet aging effects are generated simultaneously. Problem 3: in the aspect of evaluating the durability of the asphalt mixture, a plurality of test methods are adopted, and only one of the performances of the asphalt mixture, namely the high-temperature stability and the low-temperature crack resistance, can be evaluated through one test. An effective evaluation method capable of comprehensively evaluating the high-temperature stability and the low-temperature crack resistance of the asphalt mixture through one test is lacked.
Disclosure of Invention
The durability of the asphalt mixture is an important factor influencing the pavement performance of the asphalt mixture, and the durability of the asphalt mixture mainly comprises the influence of freeze-thaw cycles and asphalt aging on the performance of the asphalt mixture. The freeze-thaw cycle can cause the change of the composition structure of the asphalt mixture and generate frost cracking; aging effects can cause changes in the properties of the asphalt material. The freeze-thaw cycle and the aging effect respectively cause the change of the microstructure of the asphalt mixture and the change of the performance of the composition material, thereby further influencing the durability of the asphalt mixture. Therefore, when the durability of the asphalt mixture is considered, the influence of freeze-thaw cycle and aging should be comprehensively considered, the invention provides a test method for simultaneously considering the influence of freeze-thaw cycle and aging (simultaneously considering thermal aging and ultraviolet aging) on the durability of the asphalt mixture, and provides a method for simultaneously evaluating the high-temperature stability and the low-temperature crack resistance. The invention thus comprises two parts: the method comprises a test method for simultaneously considering freeze-thaw cycle and aging effect and an integrated evaluation method for high-temperature stability and low-temperature crack resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a test method considering influence of freeze thawing and aging on asphalt mixture performance comprises the following steps:
step one, preparing an asphalt mixture test piece;
determining freeze-thaw cycle and aging test parameters;
and step three, simultaneously carrying out an aging test in the melting process of the freeze-thaw cycle.
Further, in the second step, the parameters of the freeze-thaw cycle comprise the number of the freeze-thaw cycles and the freezing temperature, the freezing time, the thawing temperature and the thawing time in each cycle; the aging test parameters include: ultraviolet aging strength, heat aging temperature and aging time.
Further, the aging time and the melting time are the same.
An evaluation method considering influence of freeze thawing and aging on the performance of an asphalt mixture comprises the following steps:
step 1, performing a frequency scanning test on an asphalt mixture test piece subjected to a freeze-thaw cycle and an aging test to obtain a variation curve of the complex modulus of the asphalt mixture along with a loading frequency;
step 2, the Burger viscoelastic mechanics model comprises four elements, namely a spring I, a spring II, a sticky pot I and a sticky pot II, and a theoretical formula for obtaining a plurality of moduli based on the Burger viscoelastic mechanics model
Fitting the complex modulus obtained in the step 1 with a change curve of the loading frequency by using the theoretical formula to respectively obtain parameters in the formula, wherein in the formula, E and E 1 The elastic modulus of the spring I and the spring II are respectively; eta, eta 1 Viscosity of the sticky kettle I and viscosity of the sticky kettle II are respectively, and omega is loading frequency;
step 3, when E is reduced along with the increase of the number of freeze-thaw cycles and the aging time, defining the high-temperature stability influence parameter as GW (n, t) =1-E (n, t)/E (0, 0); defining a high temperature stability influencing parameter as GW (n, t) =1-E (0, 0)/E (n, t) when E increases with increasing number of freeze-thaw cycles and aging time; the low temperature crack resistance influencing parameter defines DW (n, t) =1- η (n, t)/η (0, 0) when η decreases with increasing number of freeze-thaw cycles and aging time; when eta is increased along with the increase of the number of freeze-thaw cycles and the aging time, the low-temperature crack resistance influence parameter defines DW (n, t) = 1-eta (0, 0)/eta (n, t), wherein E (n, t) and eta (n, t) are respectively the values of E and eta when the number of freeze-thaw cycles is n and the aging time is t; e (0, 0) and eta (0, 0) are respectively the E and eta values when the number of times of freeze-thaw cycles is 0 and the aging time is 0, and the larger the GW (n, t) and DW (n, t) values are, the larger the influence of the freeze-thaw cycles and the aging on the durability of the asphalt mixture is, the more unstable the performance of the asphalt mixture is and the worse the durability is.
Furthermore, in order to analyze the comprehensive influence of the freeze-thaw cycle and the aging effect on the durability of the asphalt mixture, a comprehensive influence parameter ZH (n, t) = α GW (n, t) + β DW (n, t) is defined, α and β are weight coefficients of high-temperature stability and low-temperature crack resistance, α + β =1, a change curve of ZH (n, t) along with the number n of freeze-thaw cycles and the aging time t is drawn, and the durability of the asphalt mixture can be analyzed and evaluated according to the change trend of the curve.
Furthermore, the pavement diseases in northern areas are mainly caused by low-temperature cracking, and alpha is taken to be less than beta; the pavement diseases in southern areas are mainly high-temperature tracks, and alpha is greater than beta.
Furthermore, in the step 2, E and eta respectively represent the high-temperature stability and the low-temperature crack resistance of the asphalt mixture, the larger E represents the better high-temperature stability of the asphalt mixture, and the smaller eta represents the better low-temperature crack resistance of the asphalt mixture.
Furthermore, in step 3, a variation curve of GW (n, t) and DW (n, t) along with the number n of freeze-thaw cycles and the aging time t is drawn, and the influence and the difference of the freeze-thaw cycles and the aging on the high-temperature stability and the low-temperature crack resistance of the asphalt mixture are further analyzed.
Further, in the step 1, the frequency range is 0-100 Hz, the frequency interval is 0.1-1Hz, and the test temperature is 25-30 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the test method provided by the invention can be used for simultaneously carrying out a freeze-thaw cycle test and an aging test, organically combining two different tests together, and simultaneously considering the coupling influence of the freeze-thaw cycle and the aging on the durability of the asphalt mixture. And based on the same mechanical property test, a method capable of simultaneously evaluating the high-temperature stability and the low-temperature crack resistance of the asphalt mixture is provided, and the method can comprehensively and quickly evaluate the durability of the asphalt mixture.
Drawings
FIG. 1 is a schematic representation of a Burgers viscoelasticity model;
FIG. 2 is a graph of frequency sweep test results and formula fit;
FIG. 3 is a graph of the variation of high temperature stability influencing parameters and low temperature crack resistance influencing parameters with the number of freeze-thaw cycles n and the aging time t;
FIG. 4 is a graph of the combined influencing parameter ZH (n, t) as a function of the number of freeze-thaw cycles n and the aging time t.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings and embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.
Detailed description of the invention
The freeze-thaw cycle and the aging effect can cause the change of the microstructure and the material properties of the components of the asphalt mixture, and cause the damage of the microstructure and the material damage of the asphalt mixture, and the macro of the two damage effects is the change of the macro mechanical properties of the asphalt mixture. Therefore, the main technical idea of the invention is to firstly carry out a freeze-thaw cycle test and an aging test on the asphalt mixture, carry out a frequency scanning test on the asphalt mixture after the freeze-thaw cycle test and the aging test, carry out theoretical analysis on the basis of the frequency scanning test result and in combination with the mechanical property of the viscoelastic material of the asphalt mixture to obtain material parameters representing the high-temperature stability and the low-temperature crack resistance of the asphalt mixture, and evaluate the influence of the freeze-thaw cycle and the aging action on the durability of the asphalt mixture according to the change rule of the material parameters along with the number of freeze-thaw cycles and the aging time. Based on the thought, the test and performance evaluation method provided by the invention mainly comprises the following steps:
a test method considering influence of freeze thawing and aging on the performance of an asphalt mixture comprises the following steps:
the method comprises the following steps: preparation of asphalt mixture test piece
Manufacturing an asphalt mixture test piece according to the designed material proportion, wherein the test piece is preferably cylindrical; the test piece size is: the diameter is 100mm, the height is 60mm, and the total number of test pieces is 15;
step two: determination of freeze-thaw cycle and aging test parameters
Freeze-thaw cycle test parameters include: the number of freeze-thaw cycles and the freezing temperature, freezing time, thawing temperature and thawing time in each cycle; the aging test parameters include: ultraviolet aging strength, heat aging temperature and aging time; specific test parameters are determined according to actual requirements; considering the simultaneity of the freeze-thaw cycle test and the aging test, the aging test is carried out simultaneously in the thawing process of the freeze-thaw cycle, namely the aging and the thawing processes are carried out simultaneously; the temperature and the ultraviolet intensity are controlled simultaneously in the aging process, the aging time is controlled, the high-temperature effect is utilized to play a role in melting a test piece and aging the test piece simultaneously, and simultaneously ultraviolet rays are adopted to irradiate the test piece to generate an ultraviolet aging effect; the 15 test pieces are divided into 5 groups, and tests with different freezing and thawing cycle times and different aging times can be respectively carried out so as to analyze the influence of the freezing and thawing cycle times and the aging times on the durability of the asphalt mixture;
step three: freeze-thaw cycle and aging test
The road comprehensive environment simulation test box is adopted to carry out freeze-thaw cycle and aging test on the asphalt mixture, and is required to have the function of carrying out freeze-thaw cycle and aging test simultaneously, so that the freezing temperature, freezing time, melting temperature and melting time, the number of freeze-thaw cycles, ultraviolet aging strength, heat aging temperature and aging time (the same as the melting time, and aging and melting are carried out simultaneously) can be accurately controlled; and (3) performing freeze-thaw cycling and aging tests according to set test parameters, wherein each group comprises 3 test pieces.
Detailed description of the invention
An evaluation method considering influence of freeze thawing and aging on asphalt mixture performance comprises the following steps:
step 1: frequency sweep test
Performing a frequency scanning test on the asphalt mixture test piece subjected to the freeze-thaw cycle and aging test in the first embodiment; performing frequency scanning by using a material performance tester, wherein the test frequency range is 0-100 Hz, the frequency interval is 0.1-1Hz, and the test temperature is 25-30 ℃; obtaining a change curve of the complex modulus of the asphalt mixture along with the loading frequency through a frequency scanning test;
and 2, step: acquisition of characterization parameters of high-temperature stability and low-temperature crack resistance of asphalt mixture
A classical burgers viscoelasticity model is shown in fig. 1, which includes four elements, namely a spring I, a spring II, a viscous pot I and a viscous pot II, and a theoretical formula of complex modulus can be obtained based on the viscoelasticity model,
in the formula E, E 1 、η、η 1 Is a material parameter for representing the viscoelasticity mechanical property of the asphalt mixture. E. E 1 The elastic modulus of the spring I and the spring II is respectively expressed in Pa; eta, eta 1 Respectively the viscosity of the clay pot I and the clay pot II, and the unit is Pa.s; ω is the loading frequency in Hz; fitting the complex modulus obtained in the step 1 with a change curve of the loading frequency by using the theoretical formula to respectively obtain the numerical values of the parameters E and eta in the formula; e and eta can respectively represent the high-temperature stability and the low-temperature crack resistance of the asphalt mixture. The larger E represents the better high-temperature stability of the asphalt mixture, and the smaller eta represents the better low-temperature crack resistance of the asphalt mixture. Therefore, the influence of the freezing-thawing cycle and the aging effect on the durability of the asphalt mixture can be analyzed through the change of the E and the eta along with the freezing-thawing cycle times and the aging time;
and step 3: asphalt mixture durability characterization considering freeze-thaw cycle and aging effect
The material parameters E and eta obtained by the steps can comprehensively reflect the influence of freeze-thaw cycle and aging on the high-temperature stability and low-temperature crack resistance of the asphalt mixture; influence parameters of high-temperature stability and low-temperature crack resistance of the asphalt mixture can be respectively defined through the changes of E and eta along with the times of freeze-thaw cycles and the aging time; defining a high-temperature stability-affecting parameter as GW (n, t) =1-E (n, t)/E (0, 0) when E decreases with increasing number of freeze-thaw cycles and aging time, and as GW (n, t) =1-E (0, 0)/E (n, t) when E increases with increasing number of freeze-thaw cycles and aging time; the low-temperature cracking resistance influence parameter is defined as DW (n, t) = 1-eta (n, t)/eta (0, 0) when eta decreases along with the increase of the number of freeze-thaw cycles and the aging time, and is defined as DW (n, t) = 1-eta (0, 0)/eta (n, t) when eta increases along with the increase of the number of freeze-thaw cycles and the aging time; in the above formula, E (n, t) and eta (n, t) are respectively the values of E and eta when the number of freeze-thaw cycles is n and the aging time is t; e (0, 0) and eta (0, 0) are respectively the E and eta values when the number of freeze-thaw cycles is 0 and the aging time is 0; from the above definitions of the influencing parameters GW (n, t) and DW (n, t), it is clear that the larger the GW (n, t) and DW (n, t) ranges from 0 to 1, and the larger the GW (n, t) and DW (n, t) values are, the larger the influence of freeze-thaw cycles and aging on the durability of the asphalt mixture is, the more unstable the performance of the asphalt mixture is, and the worse the durability is.
After obtaining the values of GW (n, t) and DW (n, t), the variation curves of GW (n, t) and DW (n, t) along with the number n of freeze-thaw cycles and the aging time t can be drawn, and the influence and the difference of the freeze-thaw cycles and the aging on the high-temperature stability and the low-temperature crack resistance of the asphalt mixture are further analyzed.
And 4, step 4: evaluation of asphalt mixture durability considering freeze-thaw cycle and aging effect
In order to analyze the comprehensive influence of freeze-thaw cycle and aging on the durability of the asphalt mixture, a comprehensive influence parameter ZH (n, t) = alpha GW (n, t) + beta DW (n, t) is introduced for evaluation, alpha and beta are high-temperature stability and low-temperature crack resistance weight coefficients, alpha + beta =1, the pavement diseases in northern areas are mainly low-temperature cracking, and alpha < beta can be selected at the moment; in southern area, the road surface disease is mainly high temperature rut, and alpha is more than beta. According to ZH (n, t), the durability of the asphalt mixture can be further analyzed, and the difference of the durability of different asphalt mixtures can be analyzed in a comparison way.
Example 1
A test and evaluation method considering influence of freeze thawing and aging on the performance of an asphalt mixture comprises the following steps:
step 1: preparation of asphalt mixture test piece
According to the material ratio of design, preparation bituminous mixture test piece, the test piece shape is the cylinder test piece, and the test piece size is: the diameter is 100mm, the height is 60mm, and the total number of test pieces is 15.
Step 2: determination of freeze-thaw cycle and aging test parameters
Freeze-thaw cycle test parameters: the freezing temperature in each cycle is-25 ℃ and the freezing time is 4h; the number of freeze-thaw cycles is 0, 5, 10, 15 and 20 respectively;
aging test parameters: considering the actual temperature inside the pavement in summer, the aging temperature is set to be 80 ℃, and the ultraviolet aging strength is set to be 20W/cm 2 Single aging time was 8h (i.e. melting time per cycle was 8 h);
and step 3: freeze-thaw cycle and aging test
And (3) carrying out freeze-thaw cycling and aging tests on the asphalt mixture by adopting a road comprehensive environment simulation test box. Freezing temperature: -25 ℃ for freezing time; 4h, melting temperature: 80 deg.C (simultaneously ultraviolet intensity: 20W/m) 2 ) Melting time (aging time): 8h, this is a cycle. Respectively circulating the test pieces of different groups for 0, 5, 10, 15 and 20 times, wherein the corresponding total aging time is respectively 0, 40, 80, 120 and 160h, and each group tests 3 parallel test pieces;
and 4, step 4: frequency sweep test
And (3) performing a frequency scanning test on the asphalt mixture test piece subjected to the freeze-thaw cycle and aging test, and performing the frequency scanning test by using a material performance tester, wherein the test frequency range is 0-60 Hz, the frequency interval is 0.1Hz, and the test temperature is 25 ℃. Obtaining a change curve of the complex modulus of the asphalt mixture along with the loading frequency through a frequency scanning test;
and 5: obtaining of characterization parameters of high-temperature stability and low-temperature crack resistance of asphalt mixture
By using a theoretical formula of the complex modulus,
and 6: asphalt mixture durability characterization considering freeze-thaw cycle and aging effects
The E values under different freezing-thawing cycle times and aging time conditions are respectively E (0, 0), E (5, 40) E (10, 80), E (15, 120) and E (20, 160) obtained by the steps; the eta values are eta (0, 0), eta (5, 40), eta (10, 80), eta (15, 120) and eta (20, 160) respectively; assuming that E decreases with increasing number of freeze-thaw cycles and aging time, the formulas GW (n, t) =1-E (n, t)/E (0, 0) are defined according to the high temperature stability-affecting parameter, GW (0, 0) =1-E (0, 0)/E (0, 0) =0, GW (5, 40) =1-E (5, 40)/E (0, 0), GW (10, 80) =1-E (10, 80)/E (0, 0), GW (15, 120) =1-E (15, 120)/E (0, 0), GW (20, 160) =1-E (20, 160)/E (0, 0); assuming that η increases with the number of freeze-thaw cycles and the aging time, DW (0, 0) =1- η (0, 0)/η (n, t) is defined according to the low-temperature crack resistance influence parameter, DW (0, 0) =1- η (0, 0)/η (0, 0) =0, DW (5, 40) =1- η (0, 0)/η (5, 40), DW (10, 80) =1- η (0, 0)/η (10, 80), DW (15, 120) =1- η (0, 0)/η (15, 120), DW (20, 160) =1- η (0, 0)/η (20, 160) can be obtained;
and 7: evaluation of asphalt mixture durability considering freeze-thaw cycle and aging effect
After obtaining the values of GW (n, t) and DW (n, t), the variation curves of GW (n, t) and DW (n, t) along with the times of freeze-thaw cycles n and the aging time t can be drawn, as shown in FIG. 3, it can be seen that the influence of the freeze-thaw cycles and the aging action on the high-temperature stability is larger than the influence on the low-temperature crack resistance, which indicates that the low-temperature crack resistance of the material is relatively stable, according to the comprehensive influence parameter formula ZH (n, t) = alpha GW (n, t) + β DW (n, t), assuming that in northern areas, road surface diseases are mainly caused by low-temperature cracking, α =0.3, β =0.7 may be taken, and at this time, comprehensive influence parameters ZH (0, 0) =0.3GW (0, 0) +0.7DW (0, 0), ZH (5, 40) =0.3GW (5, 40) +0.7DW (5, 40), ZH (10, 80) =0.3GW (10, 80) +0.7DW (10, 80), ZH (15, 120) =0.3GW (15, 120) +0.7DW (15, 120), ZH (20, 160) =0.3GW (20, 160) +0.7DW (20, 160) are obtained; a curve of ZH (n, t) along with the change of the number of freeze-thaw cycles n and the aging time t can be drawn, as shown in fig. 4, the curve is relatively gentle, which indicates that the influence of freeze-thaw cycles and aging on the material performance of the asphalt mixture is relatively small, the durability of the asphalt mixture is relatively good, and when the curve is relatively steep, the influence of freeze-thaw cycles and aging on the material performance of the asphalt mixture is relatively large, and the durability of the asphalt mixture is relatively poor.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (9)
1. A test method considering influence of freeze thawing and aging on asphalt mixture performance is characterized by comprising the following steps:
step one, preparing an asphalt mixture test piece;
step two, determining freeze-thaw cycle and aging test parameters;
and step three, simultaneously carrying out an aging test in the thawing process of the freeze-thaw cycle.
2. The test method considering the influence of freeze-thaw and aging on the performance of the asphalt mixture according to claim 1, wherein the test method comprises the following steps: in the second step, the parameters of the freeze-thaw cycle comprise the number of the freeze-thaw cycles and the freezing temperature, the freezing time, the thawing temperature and the thawing time in each cycle; the aging test parameters include: ultraviolet aging strength, heat aging temperature and aging time.
3. The test method for considering the influence of freeze-thaw and aging on the performance of the asphalt mixture according to claim 2, wherein the test method comprises the following steps: the aging time and melting time were the same.
4. An evaluation method considering influence of freeze thawing and aging on asphalt mixture performance is characterized by comprising the following steps:
step 1, performing a frequency scanning test on an asphalt mixture test piece subjected to a freeze-thaw cycle and aging test to obtain a variation curve of the complex modulus of the asphalt mixture along with the loading frequency;
step 2, the Burger viscoelastic mechanics model comprises four elements, namely a spring I, a spring II, a sticky pot I and a sticky pot II, and a theoretical formula for obtaining a plurality of moduli based on the Burger viscoelastic mechanics model
Fitting the complex modulus variation curve along with the loading frequency obtained in the step 1 by using the theoretical formula to respectively obtain parameters in the formula, wherein E and E in the formula 1 The elastic modulus of the spring I and the spring II are respectively; eta, eta 1 Viscosity of the sticky kettle I and viscosity of the sticky kettle II are respectively, and omega is loading frequency;
step 3, when E is reduced along with the increase of the number of freeze-thaw cycles and the aging time, defining the high-temperature stability influence parameter as GW (n, t) =1-E (n, t)/E (0, 0); defining a high temperature stability influencing parameter as GW (n, t) =1-E (0, 0)/E (n, t) when E increases with the increase of the number of freeze-thaw cycles and the aging time; the low temperature crack resistance influencing parameter is defined as DW (n, t) = 1-eta (n, t)/eta (0, 0) when eta decreases with increasing number of freeze-thaw cycles and aging time; when eta increases along with the increase of the number of freeze-thaw cycles and the aging time, defining the low-temperature crack resistance influence parameter as DW (n, t) = 1-eta (0, 0)/eta (n, t), wherein E (n, t) and eta (n, t) are respectively the values of E and eta when the number of freeze-thaw cycles is n and the aging time is t; e (0, 0) and eta (0, 0) are respectively the values of E and eta when the number of freeze-thaw cycles is 0 and the aging time is 0, and the larger the values of GW (n, t) and DW (n, t), the larger the influence of the freeze-thaw cycles and the aging on the durability of the asphalt mixture is, the more unstable the performance of the asphalt mixture is and the poorer the durability is.
5. The evaluation method considering the influence of freeze-thaw and aging on the performance of the asphalt mixture according to claim 4, wherein the evaluation method comprises the following steps: in order to analyze the comprehensive influence of the freeze-thaw cycle and the aging effect on the durability of the asphalt mixture, a comprehensive influence parameter ZH (n, t) = alpha GW (n, t) + beta DW (n, t), wherein alpha and beta are weight coefficients of high-temperature stability and low-temperature crack resistance, alpha + beta =1 is defined, a change curve of ZH (n, t) along with the number n of freeze-thaw cycles and the aging time t is drawn, and the durability of the asphalt mixture can be analyzed and evaluated according to the change trend of the curve.
6. The evaluation method considering the influence of freeze-thaw and aging on the performance of the asphalt mixture according to claim 5, wherein the evaluation method comprises the following steps: the pavement diseases in northern areas are mainly caused by low-temperature cracking, and alpha is taken to be less than beta; the pavement diseases in southern areas are mainly high-temperature tracks, and alpha is greater than beta.
7. The evaluation method considering the influence of freeze-thaw and aging on the performance of the asphalt mixture according to claim 4, wherein the evaluation method comprises the following steps: in the step 2, E and eta respectively represent the high-temperature stability and the low-temperature crack resistance of the asphalt mixture, the larger E represents the better high-temperature stability of the asphalt mixture, and the smaller eta represents the better low-temperature crack resistance of the asphalt mixture.
8. The evaluation method considering the influence of freeze-thaw and aging on the performance of the asphalt mixture according to claim 4, wherein the evaluation method comprises the following steps: in step 3, variation curves of GW (n, t) and DW (n, t) along with the number n of freeze-thaw cycles and the aging time t are drawn, and the influence and the difference of the freeze-thaw cycles and the aging on the high-temperature stability and the low-temperature crack resistance of the asphalt mixture are further analyzed.
9. The evaluation method considering the influence of freeze-thawing and aging on the performance of the asphalt mixture according to claim 4, wherein the evaluation method comprises the following steps: in the step 1, the frequency range is 0-100 Hz, the frequency interval is 0.1-1Hz, and the test temperature is 25-30 ℃.
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