CN111351696A - Method for accelerated test of long-term creep performance of asphalt concrete under small strain condition - Google Patents
Method for accelerated test of long-term creep performance of asphalt concrete under small strain condition Download PDFInfo
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Abstract
The invention relates to a novel test method in the field of civil engineering, in particular to an accelerated test method for long-term creep performance of asphalt concrete under a small strain condition. The method for testing the long-term creep performance of the asphalt concrete under the small-strain condition is based on the viscoelastic mechanical characteristics of the asphalt concrete, fully utilizes the time-temperature equivalent principle and the time-stress equivalent principle of a viscoelastic material, and predicts the long-term creep performance of the asphalt concrete under the small-strain condition through a short-term creep test. The method can effectively overcome the defects of high requirement on test progress, long test time and the like of the traditional test method under the condition of small strain, and can accurately predict the long-term creep property of the asphalt concrete under the condition of small strain only through a short-term test.
Description
Technical Field
The invention relates to a novel asphalt concrete test technology, and belongs to the technical field of railways.
Background
The phenomenon of strain increase with time under load with viscoelastic properties under constant stress is called creep. Asphalt concrete is a typical viscoelastic material with significant creep properties. Creep behavior is a key factor affecting the long-term stability of asphalt concrete structures. In recent years, the asphalt concrete foundation bed surface layer is taken as a new asphalt concrete structure form, and has a better application effect in the ballastless track of the high-speed railway in China. The asphalt concrete foundation bed top layer is laid below the base plate in the ballastless track structure and serves as a supporting layer and a waterproof layer, the waterproof performance of the ballastless track structure can be obviously enhanced, the stability of the roadbed is improved, and the maintenance cost is reduced. Different from the traditional asphalt pavement structure, the asphalt concrete foundation bed surface layer simultaneously bears the continuous action of the self-weight load of the upper structure and the continuous action of the dynamic load of the train during the service period. The two load forms cause the creep behavior of the asphalt concrete, and further generate permanent deformation, and influence the smoothness and the stability of the ballastless track structure. Due to the fact that the ballastless track structure is long in design service life, long-term creep behaviors of the surface layer of the asphalt concrete foundation bed in a service life cycle need to be predicted and controlled, and stability of the ballastless track structure and train operation safety can be guaranteed.
The creep behavior of the asphalt concrete material under the long-term load action is always a research hotspot and a research difficult problem in the field of road engineering. At present, the permanent deformation of the asphalt concrete pavement is generally predicted by methods of empirical formula estimation, accelerated loading test, dynamic creep test, finite element numerical simulation and the like in road engineering research. However, the creep behavior of the asphalt concrete material is influenced by various factors such as stress level, temperature condition, material aging and the like, and the asphalt concrete material shows different creep compliance under different stress levels and environmental conditions, and has remarkable nonlinear characteristics. Due to the particularity of the track structure, the service environment of the surface layer of the asphalt concrete foundation bed in the ballastless track is obviously different from that of an asphalt pavement, the design service life is long, the service stress level is low, the creep rate is very low, and the accumulative effect is obvious.
For the special service environment of the small strain condition, due to the limitation of factors such as testing precision, computer computing resources and computing time, the common asphalt concrete creep behavior evaluation methods such as long-term creep test and finite element numerical simulation have poor applicability, and the creep behavior of the asphalt concrete in the service environment of the track structure cannot be evaluated and predicted well.
Disclosure of Invention
The invention aims to overcome the defects of long test time, high requirement on test progress and the like in the traditional test method, and provides an accelerated test method for the long-term creep performance of asphalt concrete under a small strain condition. The method provides reference for engineering application of the asphalt concrete foundation bed surface layer of the high-speed railway.
In order to solve the technical problems, the invention is realized by the following technical scheme: an accelerated test method for long-term creep performance of asphalt concrete under a small strain condition comprises the following steps:
(1) developing a creep test under the equal stress condition and different temperature levels, and solving a time-temperature shift factor by using a creep compliance curve family obtained by the test to obtain a main creep compliance curve of the asphalt mixture;
(2) and (3) developing a creep test under the equal temperature condition and different stress levels, and solving a time-stress shift factor by using a creep compliance curve family obtained by the test to obtain a main creep compliance curve of the asphalt mixture.
(3) Checking the creep compliance main curves of the asphalt mixtures in the step (1) and the step (2) at the same temperature and stress level;
(4) and finally, a time-temperature-stress equivalent equation is deduced by combining the assumption that the free volume is influenced by the temperature condition and the stress level at the same time.
As an improvement of the present invention, the step (1) specifically comprises:
(1-1) firstly, calculating creep compliance according to a creep test result, and drawing a time-creep compliance curve family under the conditions of equal stress level and different temperatures in a logarithmic coordinate system;
(1-2) selecting a reference temperature level from a time-creep compliance curve chart, and horizontally moving creep compliance curves at other temperature levels along a time axis through manual translation to enable all curve sections to be smoothly lapped so as to obtain a horizontal shift factor pre-estimated value;
(1-3) carrying out regression analysis on the obtained horizontal shifting factor estimated value based on the time-temperature equivalent principle to obtain C in a WLF (Williams-Landel-Ferry) formula1、C2Parameter value, horizontal displacement α on time axis in time-temperature equivalent equation conversionTThe following relationship is satisfied:
in the formula, αTAs a shift factor, τ and τrThe relaxation times of the viscoelastic material at temperatures T and Tr, respectively, C1、C2As empirical parameter, T is the transition temperature, TrIs a reference temperature;
(1-4) Using C1、C2And (4) recalculating horizontal shift factors corresponding to different temperature levels by the parameters, and shifting in a semi-logarithmic coordinate to obtain a creep compliance main curve under the stress condition.
As an improvement of the present invention, the step (2) specifically includes:
(2-1) firstly, calculating creep compliance according to a creep test result, and drawing a time-creep compliance curve family under the conditions of equal temperature and different stresses in a logarithmic coordinate system;
(2-2) obtaining D in the time-stress equivalent expression by manual lapping and regression analysis1、D2The parameter value, the time-stress equivalent equation is:
in the formula, ασIs a displacement factor, D1、D2As empirical parameter, σ is the conversion temperature, σrIs the reference temperature.
And (2-3) recalculating vertical displacement factors corresponding to different stress vertical directions by using the D1 and D2 parameter values, and performing displacement in a semilogarithmic coordinate to obtain a creep compliance main curve under the temperature condition.
Similar to the derivation process of the time-temperature equivalent effect and the time-stress equivalent effect, assuming that the free volume is affected by both the temperature condition and the stress level, the time-temperature-stress equivalent equation (equation 3) is finally derived. Therefore, as long as a time-temperature creep main curve or a time-stress main curve is obtained, the time-temperature-stress combined shift factor can be used for obtaining the creep main curve under any stress level or temperature condition.
In the formula, phiT,σIs a temperature-stress joint shift factor; f (T)r,σr) Is a reference temperature TrReference stress sigmarFractional free volume at conditions, αT、ασRespectively, free volume thermal expansion coefficient and stress expansion coefficient; b is a constant and numerous experimental results indicate that B ≈ 1 for almost all materials.
Compared with the prior art, the invention has the beneficial effects that:
the accelerated test method fully utilizes the time-temperature equivalent principle of the viscoelastic material, and predicts the long-term creep performance of the asphalt concrete under the condition of small strain through a short-term creep test. The method can effectively overcome the defects of high requirement on test progress, long test time and the like of the traditional test method under the condition of small strain, can accurately predict the long-term creep performance of the asphalt concrete under the condition of small strain only through a short-term creep test, and can more effectively evaluate the deformation damage resistance of the asphalt concrete. The method can provide a certain reference for the deformation damage resistance evaluation and the optimization design of the surface layer of the high-speed railway ballastless track asphalt concrete foundation bed.
Drawings
FIG. 1 shows the fitting result of the creep compliance master curve of a certain asphalt mixture under the condition of equal stress and different temperature levels under the condition of static loading.
FIG. 2 is a main creep compliance curve fitting result of a certain asphalt mixture under static loading conditions under the same temperature condition and different stress levels in the invention.
Detailed Description
Firstly, forming a cylindrical test piece with the diameter of 15cm and the height of 17cm by using a rotary compaction instrument for the mixed asphalt mixture, controlling the void ratio of the asphalt mixture to be 3% by adopting a height control method, then drilling a core sample with the thickness of 10cm × 17cm from the cylindrical test piece with the thickness of 15cm × 17cm by adopting a core drilling machine, finally cutting off 1cm at two ends respectively by adopting an automatic asphalt concrete cutting machine, and finally obtaining a cylindrical test piece with the thickness of 10cm × 15cm for developing a creep test.
Creep tests were conducted using a UTM-130 model multifunctional asphalt mixture testing system manufactured by IPC Global, Australia. Creep tests under the conditions of equal stress and different temperatures and under the levels of equal temperature and different stresses are respectively carried out. Fitting is carried out by using a creep curve family of the asphalt concrete obtained by tests under different temperatures and stress levels, and finally a main creep curve of the asphalt concrete is obtained.
Firstly, calculating the creep compliance from the creep test result, and drawing a time-creep compliance curve family under the conditions of equal stress level (0.5MPa) and different temperatures in a logarithmic coordinate system.
In the time-creep compliance curve chart, a reference temperature level is selected, and creep compliance curves at other temperature levels are horizontally moved along a time axis through manual translation, so that all curve segments are smoothly lapped, and a horizontal shift factor estimated value is obtained.
And performing regression analysis on the obtained horizontal shifting factor estimated value based on a time-temperature equivalent principle to obtain the parameter values of C1 and C2 in the WLF formula.
And recalculating horizontal shift factors corresponding to different temperature levels by using the parameters of C1 and C2, and shifting in a semilogarithmic coordinate to obtain a creep compliance main curve under the stress condition of 0.5 MPa.
Then based on the time-creep compliance curve family under the conditions of equal temperature level (50 ℃) and different stresses, obtaining the parameter values D1 and D2 in the time-stress equivalent expression through manual lapping and regression analysis, and finally obtaining a main creep compliance curve under the temperature condition of 50 ℃; in addition, in the process of constructing the time-stress equivalent creep compliance main curve, a vertical displacement factor is often required to be determined in a logarithmic coordinate system, and the method and the steps are similar to those of a horizontal displacement factor.
The two main creep compliance curves are checked against each other by setting a reference temperature/stress level.
By using creep test results under equal stress conditions and different temperature levels, creep compliance is calculated according to creep strain, then according to the main curve fitting method, creep compliance curves under different temperature levels are fitted and overlapped in a logarithmic coordinate system, a creep compliance main curve of asphalt concrete under the test stress level is constructed, and accordingly the time-temperature equivalent displacement factor is determined. In fig. 1, the left side is a creep compliance curve family obtained by experiments under different temperature conditions, and the right side is a creep compliance main curve obtained by the creep compliance curve family through horizontal shift lapping and time-temperature equivalent parameters obtained by horizontal shift factor fitting.
According to creep test results under the equal temperature condition and different stress levels, creep compliance is calculated according to creep strain, then the main curve fitting method is adopted, the creep compliance curve families under different stress levels are overlapped in a logarithmic coordinate system, a creep compliance main curve of the asphalt concrete under the test temperature level is constructed, and therefore a time-stress equivalent shift factor is determined, and parameters of a time-stress equivalent WLF type equation are obtained through fitting. FIG. 2 shows the results of the main curve fitting of creep compliance at 50 ℃ under static loading conditions for a certain asphalt mixture. The upper half part of the graph is a creep compliance curve family under different stress levels obtained by tests and a main creep compliance curve obtained by the creep compliance curve family through horizontal shift lapping, and the lower half part of the graph is a main creep compliance curve obtained by the horizontal shift lappingShift factor values the shift factor is fitted to the resulting time-stress equivalent parameters. Taking 0.1MPa as reference stress, and horizontally and vertically shifting a creep curve group under the high stress level to obtain the asphalt mixture of 0-10 percent7Creep compliance curve in time domain.
Claims (3)
1. An accelerated test method for long-term creep performance of asphalt concrete under a small strain condition is characterized by comprising the following steps: the method comprises the following steps:
(1) developing a creep test under the equal stress condition and different temperature levels, and solving a time-temperature shift factor by using a creep compliance curve family obtained by the test to obtain a main creep compliance curve of the asphalt mixture;
(2) and (3) developing a creep test under the equal temperature condition and different stress levels, and solving a time-stress shift factor by using a creep compliance curve family obtained by the test to obtain a main creep compliance curve of the asphalt mixture.
(3) Checking the creep compliance main curves of the asphalt mixtures in the step (1) and the step (2) at the same temperature and stress level;
(4) and finally, a time-temperature-stress equivalent equation is deduced by combining the assumption that the free volume is influenced by the temperature condition and the stress level at the same time.
2. The accelerated test method for the long-term creep performance of the asphalt concrete under the condition of small strain according to claim 1, characterized in that: the step (1) is specifically as follows:
(1-1) firstly, calculating creep compliance according to a creep test result, and drawing a time-creep compliance curve family under the conditions of equal stress level and different temperatures in a logarithmic coordinate system;
(1-2) selecting a reference temperature level from a time-creep compliance curve chart, and horizontally moving creep compliance curves at other temperature levels along a time axis through manual translation to enable all curve sections to be smoothly lapped so as to obtain a horizontal shift factor pre-estimated value;
(1-3) performing regression on the obtained horizontal shift factor estimated value based on the time-temperature equivalence principleAnalyzing to obtain parameter values of C1 and C2 in WLF formula, and horizontal displacement α on time axis in time-temperature equivalent equation conversionTThe following relationship is satisfied:
in the formula, αTAs a shift factor, τ and τrRespectively, of viscoelastic material at temperatures T and TrRelaxation time of time, C1、C2As empirical parameter, T is the transition temperature, TrIs a reference temperature;
and (1-4) recalculating horizontal shift factors corresponding to different temperature levels by using the parameters of C1 and C2, and shifting in a semilogarithmic coordinate to obtain a creep compliance main curve under the stress condition.
3. The accelerated test method for the long-term creep performance of the asphalt concrete under the condition of small strain according to claim 1, characterized in that: the step (2) is specifically as follows:
(2-1) firstly, calculating creep compliance according to a creep test result, and drawing a time-creep compliance curve family under the conditions of equal temperature and different stresses in a logarithmic coordinate system;
(2-2) obtaining the parameter values D1 and D2 in the time-stress equivalent expression through manual lapping and regression analysis, wherein the time-stress equivalent equation is as follows:
in the formula, ασIs a displacement factor, D1、D2As empirical parameter, σ is the conversion temperature, σrIs a reference temperature;
and (2-3) recalculating vertical displacement factors corresponding to different stress vertical directions by using the D1 and D2 parameter values, and performing displacement in a semilogarithmic coordinate to obtain a creep compliance main curve under the temperature condition.
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| CN112014216A (en) * | 2020-09-04 | 2020-12-01 | 长沙理工大学 | Calculation method of three-dimensional strain failure criterion model of asphalt mixture |
| CN112326724A (en) * | 2020-10-19 | 2021-02-05 | 湖南大学 | Determination method of time-temperature equivalent relation of SBS modified asphalt |
| CN113092276A (en) * | 2021-03-10 | 2021-07-09 | 上海工程技术大学 | Method for testing accelerated creep of thermoplastic elastomer |
| CN113310794A (en) * | 2021-04-30 | 2021-08-27 | 汕头大学 | Long-term property determination method for rubber sealing gasket of shield tunnel |
| WO2022134898A1 (en) * | 2020-12-24 | 2022-06-30 | 南京航空航天大学 | Creep load equivalent acceleration method based on failure mode consistency |
| CN117589663A (en) * | 2024-01-18 | 2024-02-23 | 西南石油大学 | Residual life prediction method for nonmetallic pipeline of oil-gas field |
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| CN117589663A (en) * | 2024-01-18 | 2024-02-23 | 西南石油大学 | Residual life prediction method for nonmetallic pipeline of oil-gas field |
| CN117589663B (en) * | 2024-01-18 | 2024-03-19 | 西南石油大学 | Residual life prediction method for nonmetallic pipeline of oil-gas field |
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