CN109342211B - Mechanical evaluation method for high-temperature stability of asphalt mixture - Google Patents
Mechanical evaluation method for high-temperature stability of asphalt mixture Download PDFInfo
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- CN109342211B CN109342211B CN201811162500.XA CN201811162500A CN109342211B CN 109342211 B CN109342211 B CN 109342211B CN 201811162500 A CN201811162500 A CN 201811162500A CN 109342211 B CN109342211 B CN 109342211B
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- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- 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
- G01N3/40—Investigating hardness or rebound hardness
Abstract
The invention discloses a mechanical evaluation method for high-temperature stability of an asphalt mixture, which comprises the steps of detecting the mechanical property of an asphalt mixture test piece to be evaluated, and recording the deformation parameters of the asphalt mixture test piece to be evaluated, wherein the deformation parameters comprise axial deformation, actual load and loading time; measuring the height of the test piece, and calculating creep compliance D (t) of different loading time according to the height of the test piece, the axial deformation and the actual load; fitting the relation between the creep compliance D (t) and the loading time t by using an S-shaped function to obtain a fitting curve of the creep compliance D (t); solving a second derivative of the fitted creep compliance D (t) curve, and obtaining a unique solution as the flow time of the asphalt mixture when the second derivative is equal to zero; the data processing method and the built-in algorithm of the test instrument are more accurate.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a mechanical evaluation method for high-temperature stability of an asphalt mixture.
Background
High temperature stability is one of the important properties of asphalt mixtures, which determines the ability of asphalt pavements to resist rutting in high temperature seasons. The insufficient high-temperature stability can cause track diseases on the road surface, influence the driving comfort, and influence the safety of vehicles under severe conditions, and particularly, when raining, the water accumulation in the track groove is severe, so that the phenomenon of poor generation and water slip of tires can cause the loss of the controllability of the vehicles. The high temperature stability of asphalt mixtures is used as a primary material design or inspection index in major countries throughout the world.
The method for evaluating the high-temperature performance of the asphalt mixture based on mechanics is one of the development directions of the current rutting evaluation research. Asphalt mixtures are typical viscoelastic bodies, and the high-temperature stability and the high-temperature creep property of the materials are directly related. The united states SHAP project proposes to evaluate the high temperature stability of asphalt mixture by calculating Flow Time parameter (Flow Time) through uniaxial compression creep test data at high temperature to obtain the curve relation of fig. 1 and 2, but the test and evaluation method mainly aims at the united states traffic condition, and the test method and data processing are insufficient. One of the problems is: the method includes selecting local test data, calculating creep compliance of each data point, fitting the relationship between the creep compliance and time by using a quadratic function, obtaining a change rate of the local creep compliance by derivation, and repeating the process to obtain a rule of the change rate of the creep compliance and time in all experimental processes, wherein the relationship between the change rate of the creep compliance and the time of the traditional asphalt mixture is shown in fig. 1, and the lowest point of a curve is flow time. In this method, the local data is arbitrarily selected, and it can be seen from fig. 1 that the quadratic function is not suitable for fitting the test data.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a mechanical evaluation method for high-temperature stability of an asphalt mixture, and the data processing method is more accurate.
The invention provides a mechanical evaluation method for high-temperature stability of an asphalt mixture, which comprises the following steps:
detecting the mechanical property of an asphalt mixture test piece to be evaluated, and recording deformation parameters of the asphalt mixture test piece to be evaluated, wherein the deformation parameters comprise axial deformation, actual load and loading time;
measuring the height of the test piece, and calculating creep compliance D (t) of different loading time according to the height of the test piece, the axial deformation and the actual load;
fitting the relation between the creep compliance D (t) and the loading time t by using an S-shaped function to obtain a fitting curve of the creep compliance D (t);
and (3) solving a second derivative of the fitted creep compliance D (t) curve, and taking the only solution obtained when the second derivative is equal to zero as the flow time of the asphalt mixture.
Preferably, before the mechanical property of the asphalt mixture test piece to be evaluated is detected and the deformation parameter of the asphalt mixture test piece to be evaluated is recorded, the method further comprises the following steps:
and compacting and molding the asphalt mixture by adopting a static pressure method or a rotary compactor method to obtain the asphalt mixture test piece to be evaluated.
Preferably, the mechanical property of the asphalt mixture test piece to be evaluated is detected by a universal testing machine.
Preferably, the asphalt mixture test piece to be evaluated is placed in a closed rubber membrane, and an upper pressure head and a lower base of the universal testing machine are wrapped by the rubber membrane.
Further, the creep compliance d (t) is calculated using the following formula:
D（t）=（dL/L）/S，
wherein: s is the actual load, dL is the axial deflection, and L is the test piece height.
Further, the fitted curve of the creep compliance d (t) has a functional form of:
D(t)=AtB+CeDt+E，
where A, B, C, D, E is the fitting parameter and t is the load time.
The mechanical evaluation method for the high-temperature stability of the asphalt mixture, provided by the invention, has the advantages that: compared with the traditional method of fitting the creep compliance and time relationship of the asphalt mixture by a quadratic function, the mechanical evaluation method of the high-temperature stability of the asphalt mixture provided by the invention has the advantages that the data processing method and the built-in algorithm of a testing instrument are more accurate, and the mechanical evaluation accuracy of the high-temperature stability of the asphalt mixture is improved.
Drawings
FIG. 1 is a graph of strain versus time for a conventional asphalt mixture;
FIG. 2 is a graph of creep compliance change rate versus time for a conventional asphalt mixture;
FIG. 3 is a graph of a fitted creep compliance versus load time relationship of the present invention;
FIG. 4 is a flow chart of the working steps of the present invention.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Referring to fig. 3 and 4, the mechanical evaluation method for high-temperature stability of asphalt mixture provided by the invention is used for detecting the mechanical property of a test piece of asphalt mixture to be evaluated, and comprises the following steps:
s1: and detecting the mechanical property of the asphalt mixture test piece to be evaluated, and recording the deformation parameters of the asphalt mixture test piece to be evaluated, wherein the deformation parameters comprise axial deformation, actual load and loading time.
Compacting and molding the asphalt mixture by adopting a static pressure method or a rotary compactor method to obtain an asphalt mixture test piece to be evaluated; obtaining cylindrical asphalt mixture test pieces to be evaluated with the diameter of 100mm and the height of 150mm, wherein the porosity of the test pieces is 7 percent, the compaction porosity of the asphalt mixture test pieces to be evaluated by a static pressure method or a rotary compaction instrument method is 7 +/-0.5 percent of target porosity, and the quantity of the asphalt mixture test pieces to be evaluated is recommended to be 3.
Adopting a hydraulic universal testing machine with a temperature control box, controlling the temperature at 60 ℃, placing the asphalt mixture test piece to be evaluated in a closed rubber film, wrapping an upper pressure head and a lower base of the universal testing machine with the rubber film, and testing the asphalt mixture test piece to be evaluated by adopting a uniaxial compression experiment method with confining pressure: loading 700KPa axial load, 50KPa confining pressure until the test piece is destroyed, if the test piece is not destroyed after more than 8000s, terminating the experiment, and according to the recorded deformation parameters of the asphalt mixture test piece to be evaluated, wherein the deformation parameters comprise axial deformation, actual load and loading time.
S2: and measuring the height of the test piece, and calculating creep compliance D (t) at different loading times according to the height of the test piece, the axial deformation and the actual load.
Creep compliance d (t) was calculated using the following equation:
D（t）=（dL/L）/S，
wherein: s is the actual load, dL is the axial deflection, and L is the test piece height.
S3: and fitting the relation between the creep compliance D (t) and the loading time by using an S-shaped function to obtain a fitting curve of the creep compliance D (t).
The fitting process of the sigmoid function is nonlinear fitting, and an initial value and a fitting calculation method are set according to actual conditions to obtain a fitting curve of the creep compliance d (t) shown in fig. 3, wherein the fitting function is as follows:
D(t)=AtB+CeDt+E，
where A, B, C, D, E is the fitting parameter and t is time.
S4: and (3) solving a second derivative of the fitted creep compliance D (t) curve, and taking the only solution obtained when the second derivative is equal to zero as the flow time of the asphalt mixture.
The high-order stability of the asphalt mixture is judged through the flow time, the mathematical definition of the flow time is the inflection point of a relation curve of creep compliance and loading time, and therefore the only solution obtained when the second derivative is equal to zero is the flow time of the asphalt mixture.
When a uniaxial compression experiment method with confining pressure is adopted to test an asphalt mixture test piece to be evaluated, the main purpose of loading the confining pressure is as follows: (a) in order to prevent the test piece from being rapidly damaged after being loaded under the high-temperature stability detection; (b) the three-dimensional stress environment of the asphalt mixture road on site can be simulated approximately.
As shown in fig. 3, it can be intuitively obtained that: the fitting process of the S-shaped function is nonlinear fitting, the relationship between creep compliance and loading time is fitted through the S-shaped function, and the curves of the test data and the fitting data tend to be consistent, so that the actual evaluation of the high-temperature performance of the asphalt mixture is indirectly obtained by evaluating the high-temperature performance of the asphalt mixture through the fitting data, and the evaluation of the high-temperature performance of the asphalt mixture is finally realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A mechanical evaluation method for high-temperature stability of an asphalt mixture is characterized by comprising the following steps:
detecting the mechanical property of an asphalt mixture test piece to be evaluated, and recording deformation parameters of the asphalt mixture test piece to be evaluated, wherein the deformation parameters comprise axial deformation, actual load and loading time;
measuring the height of the test piece, and calculating creep compliance D (t) of different loading time according to the height of the test piece, the axial deformation and the actual load;
fitting the relation between the creep compliance D (t) and the loading time t by using an S-shaped function to obtain a fitting curve of the creep compliance D (t);
solving a second derivative of the fitted creep compliance D (t) curve, and taking the only solution obtained when the second derivative is equal to zero as the flow time of the asphalt mixture;
the creep compliance D (t) is a function of the fit curve in the form:
D(t)＝AtB+CeDt+E，
where A, B, C, D, E is the fitting parameter and t is the load time.
2. The mechanical evaluation method for the high-temperature stability of the asphalt mixture according to claim 1, wherein before the mechanical property of the asphalt mixture test piece to be evaluated is detected and the deformation parameters of the asphalt mixture test piece to be evaluated are recorded, the method further comprises the following steps:
and compacting and molding the asphalt mixture by adopting a static pressure method or a rotary compactor method to obtain the asphalt mixture test piece to be evaluated.
3. The mechanical evaluation method for the high-temperature stability of the asphalt mixture according to claim 1, wherein the mechanical property of the asphalt mixture test piece to be evaluated is detected by a universal testing machine.
4. The mechanical evaluation method for the high-temperature stability of the asphalt mixture according to claim 3, characterized in that the asphalt mixture test piece to be evaluated is placed in a closed rubber membrane, and an upper pressure head and a lower base of the universal testing machine are wrapped by the rubber membrane.
5. The mechanical evaluation method for the high-temperature stability of the bituminous mixture according to claim 1, wherein the creep compliance d (t) is calculated by using the following formula:
D(t)＝(dL/L)/S，
wherein: s is the actual load, dL is the axial deflection, and L is the test piece height.
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| CN109724866A (en) * | 2019-02-28 | 2019-05-07 | 滁州市交通工程试验检测有限公司 | A kind of bituminous pavement pitch high temperature resistance detection device and its detection method |
| CN112067457A (en) * | 2020-09-02 | 2020-12-11 | 南京林业大学 | Method for predicting creep deformation of asphalt mixture by using logistic street model |
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| CN103553389A (en) * | 2013-10-18 | 2014-02-05 | 汇通路桥建设集团有限公司 | Interwoven composite fiber for improving pavement performance of asphalt mixture |
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| US20170370899A1 (en) * | 2016-06-22 | 2017-12-28 | Arizona Chemical Company, Llc | Methods for Evaluating Asphalt Mix Compositions Containing Reclaimed Asphalt |
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| CN102519812A (en) * | 2011-12-16 | 2012-06-27 | 长沙理工大学 | Method for evaluating high-temperature stability of asphalt pavement structure or asphalt mixture |
| CN103553389A (en) * | 2013-10-18 | 2014-02-05 | 汇通路桥建设集团有限公司 | Interwoven composite fiber for improving pavement performance of asphalt mixture |
| CN104316418A (en) * | 2014-10-09 | 2015-01-28 | 沈阳建筑大学 | Evaluation index of high-temperature stability performance of asphalt mixture in cold region |
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