CN111855445B - Method for testing load-bearing state of aggregate framework of asphalt mixture - Google Patents
Method for testing load-bearing state of aggregate framework of asphalt mixture Download PDFInfo
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- CN111855445B CN111855445B CN202010658295.7A CN202010658295A CN111855445B CN 111855445 B CN111855445 B CN 111855445B CN 202010658295 A CN202010658295 A CN 202010658295A CN 111855445 B CN111855445 B CN 111855445B
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
- G01N2203/0007—Low frequencies up to 100 Hz
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
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- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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Abstract
The invention belongs to the technical field of asphalt pavement material design, and provides a method for testing a load-bearing state of an aggregate framework of an asphalt mixture. The invention is based on the prior art, the experimental method is not complex, and the problem that the aggregate framework in the asphalt mixture can not clearly and quantitatively test the bearing function is solved. Common diseases such as rutting, fatigue cracking and the like of the asphalt pavement are caused by the fact that loads of vehicles and the environment obviously exceed the bearing range of the mucilage, and the distribution of the aggregate framework to the loads further influences the disease resistance of the mixture. The method provided by the invention can be used for quantitatively guiding the gradation design of the asphalt mixture, evaluating the construction quality of the asphalt pavement and analyzing the influence of different aggregate gradations on the macroscopic performance variability of the mixture. The method can also be used for quantitative analysis of the loading state of the mucilage in the mixture.
Description
Technical Field
The invention belongs to the technical field of design of asphalt pavement materials, and relates to a method for testing a load-bearing state of an aggregate framework of an asphalt mixture.
Background
Roads are important components of traffic infrastructure, and in recent years, the investment of highway construction in China accounts for 2% -3% of GDP in China. More than 95% of expressways and provincial roads in China all adopt asphalt pavements, the mileage of each level of asphalt pavements reaches 130 kilometers, and only expressways need to be overhauled and reformed by nearly ten thousand kilometers every year. The problem of early diseases of roads is never solved from the world. On the other hand, the impact of road surface maintenance on road traffic becomes increasingly intolerable and is prone to cause vicious traffic accidents. Therefore, with the development of economy and the requirement for heavy-load bearing traffic of roads, the economic and effective improvement of the service performance of the road structure and the prolongation of the service life of the roads become important research targets of road engineering.
For a long time, the design of asphalt mixtures at home and abroad is mainly based on an empirical method, and clear material performance indexes and standards are not given. The traditional Marshall (Marshall) design method determines the optimal oilstone ratio of the asphalt mixture through the tests of indexes such as laboratory stability, flow value and the like, but the used volume index cannot establish a comprehensive good relation with the actual pavement performance of the asphalt mixture. In 1987, the highway strategic research project (SHRP) of 1.5 million dollars in capital development of the United states congress proposed high performance asphalt pavement (Superpave), which is now widely used internationally. Although the kneading type forming process of the asphalt pavement is considered in the proportioning design of the asphalt mixture in the Superpave system, a volume design method is still used as a core, the mechanical parameters obtained by volume indexes come from a mathematical statistic model, and the volume indexes are not perfect mechanical indexes of a microscopic structure, so that the method is not suitable for a new situation which is continuously developed even though long-term engineering experience is accumulated.
Asphalt mixes can be viewed as consisting of a cement and aggregate skeleton. The influence of aggregate shape, distribution and random pores in the asphalt mixture causes high variability of stress test and analysis of the asphalt mixture. The mucilage in the asphalt mixture can be prepared into a paste with relatively uniform components and relatively stable mechanical properties. Researches show that the function separation analysis can be realized by the mortar and the aggregate framework, the viscoelasticity and the temperature sensitivity of the asphalt mixture are both contributed by the mortar, and the internal force distribution is contributed by the aggregate framework. Further, how to test the bearing state of the aggregate framework in the mixture can be an effective basis for material selection, proportioning design and establishment of a mechanical analysis model, and no related research results are provided at present.
Disclosure of Invention
The invention aims to overcome the research bottleneck that the load-bearing effect of the existing aggregate framework in the asphalt mixture cannot be effectively and quantitatively evaluated, and provides a method for testing the distribution load state of the aggregate framework in the asphalt mixture.
The technical scheme of the invention is as follows:
a method for testing the load-bearing state of an aggregate framework of an asphalt mixture comprises the following steps:
the deformation test sensor is a deformation test sensor protected in ZL201520964823.6 or ZL 201410076966.3;
Preparing at least two groups of cylindrical test pieces with the same size, wherein the following two conditions are included: (1) The method is used for the gradation design of the asphalt mixture, and the cylindrical test piece is composed of the same mucilage and different aggregate gradations; (2) The test piece is used for analyzing the performance variability of the asphalt mixture, and the cylindrical test piece is made of the same material;
(1) When each cylindrical test piece is subjected to loading test, fixing a deformation test sensor and the cylindrical test piece to be tested, and keeping the experiment temperature constant by using a material testing machine as a load application platform;
(2) The material testing machine applies a semi-sinusoidal cyclic load with the same amplitude to the cylindrical test piece, and sets load interval time; loading at a loading frequency of 1HZ to obtain an initial whole-process deformation curve; the load amplitude needs to ensure that the maximum strain of the cylindrical test piece is above 10 mu epsilon under a stable loading cycle;
(3) Keeping the load amplitude as a fixed value, increasing the loading frequency, repeating the loading experiment in the step (2), and respectively collecting the whole process deformation curve of the cylindrical test piece during each loading; setting different highest loading frequencies according to different materials, wherein the selected highest loading frequency is 10HZ; or by keeping the loading frequency unchanged, the load amplitude is increased step by step, the maximum strain is ensured to be below 600 mu epsilon under the stable loading circulation of the cylindrical test piece, and the deformation curve of the cylindrical test piece in the whole process is recorded;
(1) Analyzing and processing the deformation curves of the cylindrical test pieces respectively, extracting the deformation curve of a single loading cycle under a deformation steady state for each loading experiment, and defining the deformation curve as a representative deformation curve of each loading experiment;
(2) For each cylindrical test piece, comparing the characteristics of the representative deformation curves in different loading modes;
(3) When a single cylindrical test piece is defined to represent that a deformation curve is obviously unsmooth, the loading frequency of a corresponding constant-amplitude experiment is critical frequency, or the loading amplitude of the constant-frequency experiment is critical amplitude;
(4) Comparing the difference of the critical frequency or the critical amplitude between different cylindrical test pieces, and quantitatively deducing the difference proportion of the maximum force distributed (borne) by the mucilage in the corresponding cylindrical test piece according to the ratio of the load increasing rates under the loading state corresponding to the critical frequency or the critical amplitude; the cylindrical test piece represents the uneven degree of the deformation curve after the deformation curve is obviously uneven, and the uneven degree of the deformation curve reflects the uneven degree of the mortar bearing capacity of different cylindrical test pieces.
Carrying out a pure mucilage cylindrical test piece loading experiment under the optimal mixing ratio according to the step 3, and obtaining the critical frequency or critical amplitude of the pure mucilage test piece according to the step 4; the pure mucilage is regarded as a uniform material, so that the internal stress is regarded as uniform in a one-way compression state, and the internal stress is calculated; and taking the internal stress as a reference value, multiplying the reference value by the critical frequency or critical amplitude of the pure mortar cylindrical test piece to obtain the ratio of the result to the critical frequency or critical amplitude of the cylindrical test piece of different mixture, and taking the ratio as the maximum stress distributed by the mortar of the cylindrical test piece of the mixture.
The high-precision and high-sensitivity test piece deformation testing system completes deformation testing by using the optical fiber sensing element.
The cycle load cycle number needs to ensure that the deformation curve of the test piece can enter a second stage stable state.
The invention has the beneficial effects that: according to the invention, by utilizing the principle that under the action of external load, the impact of the asphalt micelle is increased along with the increase of the loading frequency, so that the van der Waals force between the micelles is increased, and then the displacement of the micelles occurs, and the deformation curve is not smooth, the quantitative comparison of the load bearing states of the mucilage in different asphalt mixture test pieces is realized through monitoring the deformation curve of the asphalt mixture test pieces under the action of different frequency loads, which is also equivalent to the evaluation of the distribution force performance of an aggregate framework, and the quantitative evaluation of the disease resistance of the asphalt mixture, such as rutting resistance, cracking resistance and the like, is realized by combining with the quantitative evaluation data of the mucilage performance. The invention is based on the prior art, the experimental method is not complex, and the problem that the aggregate framework in the asphalt mixture can not clearly and quantitatively test the bearing function is solved. Common diseases such as rutting, fatigue cracking and the like of the asphalt pavement are caused by the fact that loads of vehicles and the environment obviously exceed the bearing range of the mucilage, and the distribution of the aggregate framework to the loads further influences the disease resistance of the mixture. The method provided by the invention can be used for quantitatively guiding the gradation design of the asphalt mixture, evaluating the construction quality of the asphalt pavement and analyzing the influence of different aggregate gradations on the macroscopic performance variability of the mixture. The method can also be used for quantitative analysis of the loading state of the mucilage in the mixture.
Drawings
FIG. 1 is a diagram of an experimental setup for the testing method of the present invention.
FIG. 2 (a) is a smooth graph of a representative deformation curve according to the present invention;
FIG. 2 (b) is a non-smooth plot of a representative deformation curve according to the present invention.
Fig. 3 is a flow chart of aggregate skeleton distribution load state analysis of the present invention.
In the figure: 1, loading equipment; 2, a test piece bearing disc; 3, testing an asphalt concrete sample; 4, a test piece deformation test sensor; 5 loading the control equipment; 6 deforming the test sensor control device.
Detailed Description
The following detailed description of the embodiments of the invention is provided in connection with the accompanying drawings.
The invention needs to continuously record the loading direction or the lateral deformation condition of a test piece by utilizing the deformation test sensor in a cylindrical test piece bidirectional strain test sensor based on fiber bragg grating (patent number ZL 201520964823.6) or an asphalt pavement material lateral stability sensor based on fiber bragg grating (patent number ZL 201410076966.3). The strain test precision of the test piece is not lower than a few micro strains, and the sampling frequency is not lower than 100HZ.
Preparing or preparing at least two groups of cylindrical test pieces with the same size at the same time, wherein the test pieces are composed of the same mucilage and different aggregate gradations if the test pieces are used for the gradation design of the asphalt mixture; if the test piece is used for analyzing the performance variability of the asphalt mixture, the test piece is made of the same material.
31. When each test piece is loaded and tested, the deformation test sensor and the test piece to be tested are fixed, and the high-precision material testing machine is used as a load applying platform to keep the experiment temperature constant.
32. The material testing machine applies a semi-sinusoidal cyclic load with the same amplitude to a test piece, and sets a proper load pause time, wherein the load pause time is generally required to be longer than the loading time. Initially loaded at 1HZ or slightly lower loading frequency to obtain an initial full process deformation curve. The load amplitude is required to ensure that the maximum strain of the test piece is above 10 mu epsilon under a stable loading cycle.
33. After the first experiment is completed, according to the program 32, the load amplitude is kept to be a fixed value, the loading frequency is increased, the loading experiment is repeated, and the whole process deformation curve of the test piece during each loading is respectively collected. The loading frequency can be increased by multiple at the beginning, such as 1HZ,2HZ,4HZ \8230, and different highest loading frequencies can be set according to different materials, and the highest loading frequency 10HZ is recommended to be selected. Or the loading frequency is kept unchanged, and the load amplitude is increased step by step, under the experimental method, the maximum strain of the test piece is recommended to be below 600 mu epsilon under the stable loading circulation, and the deformation curve of the test piece in the whole process is recorded.
41. And analyzing and processing the deformation curve of each test piece, extracting the deformation curve of a single loading cycle under a deformation steady state for each loading experiment, and defining the deformation curve as a representative deformation curve of each loading experiment.
42. For each test piece, the representative deformation curve characteristics (variable frequency or variable load amplitude) in different loading modes are compared.
43. When the single test piece is defined to represent that the deformation curve occurs irregularly, namely when the representative deformation curve has obvious unsmooth points, the loading frequency of the corresponding constant-amplitude experiment is critical frequency f or the loading amplitude of the constant-frequency experiment is critical amplitude l.
44. Under the action of the same load amplitude, different loading frequencies represent the difference of load increasing rates, and further the impulse between the micelles is increased in proportion. When the impulse is increased to a certain degree, the impulse exceeds the van der Waals force action range between the colloidal groups, and then the colloidal groups are irregularly displaced, so that the representative deformation curve is not smooth any more. The increased load amplitude experiment can be analyzed according to the same principle. By comparing the difference of the critical frequency or the critical amplitude between different test pieces and by the ratio of the load increasing rates under the loading state corresponding to the critical frequency or the critical amplitude, the difference proportion of the maximum force distributed (borne) by the mucilage in the corresponding test piece can be quantitatively deduced. The cylindrical test piece represents the uneven degree of the deformation curve after the deformation curve is obviously uneven, and the uneven degree of the deformation curve reflects the uneven degree of the mortar bearing capacity of different cylindrical test pieces.
For example, the ratio of the maximum loads (A1, A2) sustained by the two test pieces of cement can be calculated as:
A1/A2＝f 2 */f 1 * Or A1/A2= l 2 */l 1 *
45. If the analysis precision needs to be improved, a plurality of frequency or load amplitude experiments can be carried out at smaller intervals near the existing critical frequency or critical amplitude.
And (4) carrying out a pure mucilage cylindrical test piece loading experiment under the optimal mixing ratio according to the step (3), and obtaining the critical frequency or the critical amplitude of the pure mucilage test piece according to the step (4). The cement can be regarded as a relatively uniform material, so that the internal stress can be regarded as uniform in a one-way compression state, and the internal stress can be calculated. Taking the internal stress as a reference value, and multiplying the ratio of the critical frequency (or critical amplitude) of the cement test piece to the critical frequency (or critical amplitude) of different mixture test pieces to obtain the maximum stress distributed by the cement of the mixture test piece.
Taking the constant amplitude and variable frequency experiment as an example, the calculation can be performed according to the following formula:
internal stress sigma of mortar test piece Mucilage And (= L/A), wherein L is a load amplitude value, and A is the sectional area of the test piece.
The cement of the mixture test piece 1 is subjected to the maximum stress sigma 1 ＝σ Mucilage ×f Mucilage */f 1 *。
Claims (1)
1. A method for testing the load-bearing state of an aggregate framework of an asphalt mixture is characterized by comprising the following steps:
step 1, continuously acquiring the loading direction or lateral deformation data of a test piece by using a deformation test sensor;
the deformation test sensor is a cylindrical test specimen bidirectional strain test sensor based on fiber bragg grating or a deformation test sensor protected in an asphalt pavement material lateral stability sensor based on fiber bragg grating;
step 2, test specimen preparation
Preparing at least two groups of cylindrical test pieces with the same size, wherein the following two conditions are included: (1) The method is used for the gradation design of the asphalt mixture, and the cylindrical test piece is formed by selecting the same mortar and different aggregate gradations; (2) The test piece is used for analyzing the performance variability of the asphalt mixture, and the cylindrical test piece is made of the same material;
step 3, loading experiment
(1) When each cylindrical test piece is subjected to loading test, fixing a deformation test sensor and the cylindrical test piece to be tested, and keeping the experiment temperature constant by using a material testing machine as a load application platform;
(2) The material testing machine applies a semi-sinusoidal cyclic load with the same amplitude to the cylindrical test piece, and sets load interval time; loading at a 1HZ loading frequency to obtain an initial whole-process deformation curve; the load amplitude needs to ensure that the maximum strain of the cylindrical test piece is above 10 mu epsilon under a stable loading cycle;
(3) Keeping the load amplitude as a fixed value, increasing the loading frequency, repeating the loading experiment in the step (2), and respectively collecting the whole process deformation curve of the cylindrical test piece during each loading; setting different highest loading frequencies according to different materials, wherein the selected highest loading frequency is 10HZ; or by keeping the loading frequency unchanged, the load amplitude is increased step by step, the maximum strain is ensured to be below 600 mu epsilon under the stable loading circulation of the cylindrical test piece, and the deformation curve of the cylindrical test piece in the whole process is recorded;
step 4, data analysis
(1) Analyzing and processing the deformation curves of the cylindrical test pieces respectively, extracting the deformation curve of a single loading cycle under a deformation steady state for each loading experiment, and defining the deformation curve as a representative deformation curve of each loading experiment;
(2) For each cylindrical test piece, comparing the characteristics of the representative deformation curve in different loading modes;
(3) When a single cylindrical test piece is defined to represent that a deformation curve is obviously unsmooth, the loading frequency of a corresponding constant-amplitude experiment is critical frequency, or the loading amplitude of the constant-frequency experiment is critical amplitude;
(4) Comparing the difference of critical frequency or critical amplitude between different cylindrical test pieces, and quantitatively deducing the difference proportion of the maximum force distributed by the mucilage in the corresponding cylindrical test piece according to the ratio of the load increasing rate under the loading state corresponding to the critical frequency or critical amplitude; the unsmooth degree of the cylindrical test piece representative deformation curve after the cylindrical test piece representative deformation curve obviously occurs reflects the uneven degree of the mortar bearing capacity of different cylindrical test pieces;
step 5, calibrating data
Carrying out a pure mucilage cylindrical test piece loading experiment under the optimal mixing ratio according to the step 3, and obtaining the critical frequency or critical amplitude of the pure mucilage test piece according to the step 4; the pure mucilage is regarded as a uniform material, so that the internal stress is regarded as uniform in a one-way compression state, and the internal stress is calculated; and taking the internal stress as a reference value, and multiplying the reference value by the critical frequency or critical amplitude of the pure cement cylindrical test piece to obtain the ratio of the result to the critical frequency or critical amplitude of the cylindrical test piece of different mixture, wherein the ratio is used as the maximum stress distributed by the cement of the cylindrical test piece of the mixture.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807055A (en) * | 2017-09-30 | 2018-03-16 | 东南大学 | A kind of asphalt multisequencing dynamic creep experimental data processing and analysis method |
| WO2018099228A1 (en) * | 2016-11-30 | 2018-06-07 | 中国石油天然气股份有限公司 | Method and device for determining elasticity of cement stone utilized in well cementing of oil-gas well |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018099228A1 (en) * | 2016-11-30 | 2018-06-07 | 中国石油天然气股份有限公司 | Method and device for determining elasticity of cement stone utilized in well cementing of oil-gas well |
| CN107807055A (en) * | 2017-09-30 | 2018-03-16 | 东南大学 | A kind of asphalt multisequencing dynamic creep experimental data processing and analysis method |
Non-Patent Citations (3)
| Title |
|---|
| New Asphalt Concrete Rutting Resistance Evaluation Method Based on Repeated-Load Test;Wanqiu Liu et al.;《JOURNAL OF MATERIALS IN CIVIL ENGINEERING》;ASCE-AMER SOC CIVIL ENGINEERS1801 ALEXANDER BELL DR, RESTON, VA 20191-4400;20200201;第32卷(第2期);文献号04019351，第1-8页 * |
| 基于DMA方法的橡胶沥青粘弹特性和高温性能研究;何立平;《中国博士学位论文全文数据库 工程科技Ⅱ辑》;20150415(第4期);第90-94页 * |
| 沥青混合料内部应力分布及其对粘弹性能的影响研究;郭庆林;《中国博士学位论文全文数据库 工程科技Ⅱ辑》;20130815(第8期);第89-93页 * |
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