CN113324848B - Low-temperature bending strain test method for asphalt mixture trabecula test piece - Google Patents
Low-temperature bending strain test method for asphalt mixture trabecula test piece Download PDFInfo
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- CN113324848B CN113324848B CN202110551773.9A CN202110551773A CN113324848B CN 113324848 B CN113324848 B CN 113324848B CN 202110551773 A CN202110551773 A CN 202110551773A CN 113324848 B CN113324848 B CN 113324848B
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending 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
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
Abstract
The invention provides a low-temperature bending strain test method for an asphalt mixture trabecular test piece, which relates to the field of road material tests, and is characterized in that the bending strain of the trabecular test piece is obtained based on a low-temperature loading test of the trabecular test piece, and two short trabecular test pieces are obtained after each trabecular test piece is broken; based on the short beam test piece low-temperature loading test, obtaining the bending strain value of each short beam test piece, and substituting the bending strain value of the short beam test piece into the correction coefficient of the short beam test piece and the small beam test piece for conversion to obtain a test result equivalent to the small beam test piece; and (4) integrating the result obtained after the bending strain value of the small girder test piece is converted and the bending strain of the small girder test piece to perform strain analysis. After a trabecular test piece is subjected to a loading test to obtain bending strain data, the trabecular test piece is cut off to obtain a short beam test piece, the bending strain data of the short beam test piece is converted by combining a correction coefficient, the number of samples is increased, and the data of the trabecular test piece are combined for analysis, so that the analysis accuracy is improved.
Description
Technical Field
The invention relates to the field of road material tests, in particular to a low-temperature bending strain test method for an asphalt mixture trabecula test piece.
Background
Asphalt pavement is the main form of pavement structure in China. Asphalt mix low temperature crack resistance is one of the important properties that must be investigated. According to the existing test regulations for road engineering asphalt and asphalt mixtures (JTG E20-2011) (hereinafter, the regulations for short), the low-temperature crack resistance of the asphalt mixtures is evaluated through the bending strain obtained by a low-temperature bending test of a trabecular test piece.
The trabecular test piece for the test is 250mm multiplied by 30mm multiplied by 35mm and is cut by a track plate, usually, one track plate (the size is 300mm multiplied by 50mm) can cut 7-8 trabecular test pieces generally, but the discreteness of the trabecular test result is often large, the capacity of the test sample is possibly insufficient after the variation data is abandoned, and the accuracy of the evaluation result is not good enough.
The inventor finds that in order to more accurately reflect the low-temperature performance of the asphalt mixture, the increase of the sample capacity (the number of test pieces) is necessary; however, because the test workload of the rutting plate workpiece is large, the test cost can be obviously improved by increasing the use of rutting plate materials in order to increase the sample capacity of the low-temperature performance test; the direct abandonment of the fractured trabecular test piece after the test can cause the waste of materials; in addition, the process of manufacturing the trabecular test piece for multiple times through the rut plate also consumes a large amount of time cost, and the test progress of the performance of the asphalt mixture is influenced.
Disclosure of Invention
The purpose of the disclosure is to provide a low-temperature bending strain test method for an asphalt mixture trabecular test piece, on the premise of not increasing the number of rut plate test pieces, the low-temperature performance of the asphalt mixture is comprehensively evaluated by testing the broken short beam test piece after the trabecular test piece is tested and processing the test data of the test piece and the test result of the trabecular test piece, so that the sample capacity can be increased by times, and the accuracy of the evaluation result is obviously improved.
In order to realize the purpose, the following technical scheme is adopted:
the method comprises the following steps:
a low-temperature bending strain test method for an asphalt mixture trabecular test piece comprises the following steps:
based on a low-temperature loading test of the trabecular test piece, obtaining the bending strain of the trabecular test piece, and obtaining two short trabecular test pieces after each trabecular test piece is broken;
obtaining a bending strain value of each short beam test piece based on a short beam test piece low-temperature loading test, and converting the bending strain value of each short beam test piece according to the correction coefficients of the short beam test piece and the trabecular test piece to obtain a test result equivalent to the trabecular test piece;
and (4) synthesizing the result of the converted bending strain value of the small beam test piece and the bending strain result of the small beam test piece for strain analysis.
Further, a plurality of trabecular test pieces are obtained and numbered, the deflection of the trabecular test pieces when the trabecular test pieces are broken is obtained through a low-temperature loading bending test, and the maximum bending strain of the trabecular test pieces is obtained.
And further numbering two short girder test pieces obtained after each trabecular test piece is subjected to a loading test, wherein the numbering of the short girder test pieces corresponds to that of the original trabecular test piece.
Further, after the trabecular test piece is subjected to a loading test, the trabecular test piece is broken into two short beam test pieces from the midspan, and the short beam test pieces are treated and then subjected to heat preservation and maintenance.
Further, the calculation of the correction coefficient includes the steps of:
the bending strain of the trabecular test piece is obtained, and the bending strain of the short beam test piece formed by the trabecular test piece is obtained;
the bending strain of the trabecular test piece is paired with the bending strain of the corresponding short beam test piece;
and obtaining a regression coefficient according to regression analysis as a correction coefficient.
Further, according to the deflection of the short girder test piece during the low-temperature loading test, the bending strain value of each short girder is calculated, and the arithmetic mean value of the bending strain values of the two short girder test pieces corresponding to the same small girder test piece is obtained.
Furthermore, a scatter diagram is drawn in the rectangular coordinate system, and regression analysis is performed according to the scatter distribution rule.
Further, regression analysis is carried out according to the scatter distribution selection function, and a regression coefficient related to the type of the asphalt mixture is obtained.
And further, removing abnormal values of the conversion result of the bending strain of the small beam test piece and the result of the small beam test piece.
Further, the data of the remaining bending strain were averaged as a test result.
Compared with the prior art, the utility model has the advantages and positive effects that:
(1) after a trabecular test piece is subjected to a loading test to obtain bending strain data, the trabecular test piece is cut off from a fracture surface to obtain a short trabecular test piece and obtain corresponding bending strain data, the bending strain data of the short trabecular test piece is converted by combining a correction coefficient, the number of samples is increased, and the data of the trabecular test piece are combined for analysis, so that the analysis accuracy is greatly improved;
(2) establishing a correlation relationship between the trabecular test piece and the short beam test piece; performing regression analysis on the basis of the bending strain value to obtain a regression coefficient related to the type of the asphalt mixture, and converting the test data of the short beam test piece by using the regression coefficient to be used as sample data; the test cost is saved, the using amount of the trabecular test piece can be reduced, and the time for preparing the trabecular test piece for multiple times is saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic structural diagram of a low temperature loading test apparatus in embodiment 1 of the present disclosure;
fig. 2 is a schematic view of scatter plot of regression analysis in example 1 of the present disclosure.
Detailed Description
Example 1
In an exemplary embodiment of the present disclosure, a method for testing a low-temperature bending strain of an asphalt mixture trabecular test piece is provided, as shown in fig. 1-2.
The method comprises the following steps:
obtaining a plurality of trabecular test pieces for numbering, obtaining the deflection of the trabecular test pieces when the trabecular test pieces are broken through a low-temperature loading bending test, and obtaining the maximum bending strain of each trabecular test piece;
carrying out a loading test on each trabecular test piece, then breaking the trabecular test piece from the midspan into two short trabecular test pieces, carrying out heat preservation maintenance on the short trabecular test pieces after processing the short trabecular test pieces, numbering the two obtained short trabecular test pieces, and corresponding the numbering of the short trabecular test pieces to that of the original trabecular test pieces;
based on the short beam test piece low-temperature loading test, obtaining the bending strain value of each short beam test piece, and substituting the bending strain value of the short beam test piece into the correction coefficient of the short beam test piece and the small beam test piece for conversion to obtain a test result equivalent to the small beam test piece;
removing abnormal values of the conversion result of the bending strain of the small girder test piece and the result of the small girder test piece;
and integrating the result obtained after the bending strain value conversion of the trabecular test piece and the bending strain of the trabecular test piece, processing abnormal values, and then calculating the average value of the reserved bending strain data to be used as a test result for strain analysis.
After a trabecular test piece is subjected to a loading test to obtain bending strain data, the trabecular test piece is cut off to obtain a short trabecular test piece to obtain corresponding bending strain data, the bending strain data of the short trabecular test piece is converted by combining a correction coefficient, the number of samples is increased in multiples, and the data of the trabecular test piece are combined for analysis, so that the analysis accuracy is improved.
The above test method is described in detail with reference to fig. 1 and 2:
in this embodiment, the dimensions of the trabecular test piece are determined according to the specifications of the protocol. The size of the trabecular test piece for the test is 250mm multiplied by 30mm multiplied by 35mm, and the trabecular test piece for the test is appointed to be an A-type trabecular; the A-type trabecula is cut in the middle of the span, and two short trabecular test pieces are obtained from one trabecula, the size of each short trabecular test piece is 125mm multiplied by 30mm multiplied by 35mm, and the short trabecular test piece is appointed as a B-type short trabecular test piece.
The A-type trabecula belongs to a beam type test piece in a mechanical sense, and the B-type short trabecula does not accord with the definition of a beam in the mechanical sense strictly, but is still called as the trabecula for the simplicity of expression. The calculation formula for calculating the low-temperature bending strain of the A-type trabecula cannot be directly applied to the B-type short trabecula, and a new bending strain calculation principle or method needs to be established for the B-type short trabecula.
Test mode: the type a trabeculae have the test mode specified in the current regulations, the type B short trabeculae still adopt the same test mode as the type a trabeculae, but the support for supporting the type B trabeculae is movable, such as the low temperature loading test device shown in figure 1, and the support is movable.
Because the axial length of the A-type trabecula and the B-type short trabecula is different, after the A-type trabecula model test is supported, the support interval of the low-temperature loading test device is adjusted, so that the support requirement of the B-type short trabecula can be met.
Calculation of bending strain for A-type trabecular test piece
According to the mechanics of materials or regulations, the bending strain of the A-type trabecula is calculated according to the formula (1).
In the formula, epsilon is the maximum bending strain of the bottom of the trabecula; l is the span of the trabecula and is 200mm plus or minus 0.5 mm; d is deflection, i.e. midspan LVDT displacement sensor reading, mm.
The B-type short beam is not a beam type test piece any more, so the formula (1) can not be directly utilized; however, the calculated value can still be obtained by the formula (1), except that the calculated value is not the true bending strain, and needs to be corrected, and the corrected value can be regarded as the true bending strain result of the test material.
Correction of test result of B-type short beam test piece
1. Selecting a certain type of asphalt mixture (such as AC20), preparing 1 rut plate test piece according to the current test procedure, cutting to obtain n (n is 7-8) A-type trabecular test pieces, and numbering the test pieces one by one: a. the1，A2，……，Ai，……，An. And (3) performing heat preservation and maintenance as required, then performing a low-temperature bending test, measuring the deflection of the trabecula when the trabecula is broken, and calculating the maximum bending and pulling strain at the bottom of the trabecula by using a formula (1) to obtain a group of test results: epsilonAi。
(i＝1,2,……，n)。
2. Each A-type trabecula which is numbered is subjected to a loading test, and the span is interrupted after the testThe two B-type short trabeculae are split, and the B-type short trabeculae are numbered in sequence as (B)11、B12)，(B21、B22)，……，(Bi1、Bi2)，……(Bn1、Bn2) I.e. trabeculae AiCorresponding to the cut short beam Bi1And Bi2(ii) a And continuously maintaining the B-type short girder test piece in a heat preservation way to achieve the same maintenance condition as the A-type small girder.
3. Adjusting the distance between the supports of the B-type short beam, and accurately measuring the span by using a vernier caliper, wherein the time process is finished within 10 s; then, carrying out a loading test on the B-type short beams, measuring the deflection of the B-type short beams when the B-type short beams are broken, and calculating the bending strain value of each B-type short beam by using a formula (1) to obtain a n-pair strain result: (εBi1，εBi2). The results were arithmetically averaged to obtain:
εBi＝(εBi1+εBi2)/2
4. calculating the result epsilon of the A-type trabeculaAiThe calculation result epsilon with B type short beamBiPerforming pairing, drawing a scatter diagram in a rectangular coordinate system, selecting a proper function type for regression analysis according to the distribution rule of the scatter, and establishing an equation of epsilon if the two are in a linear relationship as shown in FIG. 2BIs an independent variable, epsilonARegression equation through the origin of coordinates for the dependent variable:
εA＝αεB (2).
in the formula, epsilonAThe bending strain of the A-type trabecular test piece is calculated according to the formula (1); epsilonBThe bending strain of the B-type short beam test piece is calculated according to the formula (1); alpha is a correction coefficient related to the type of the asphalt mixture, and can be obtained through a large number of tests on various asphalt mixtures and regression analysis.
Detailed test procedure
1) According to the steps of the test specified by the regulations, preparing at least 7A-type trabecular test pieces, sequentially carrying out a loading test on the A-type trabecular test pieces, measuring the deflection during fracture, substituting the formula (1), and calculating to obtain the bending strain of all the A-type trabecular test pieces; and then breaking the trabecular test piece from midspan to obtain at least 14B-type short beam test pieces, and carrying out heat preservation and maintenance on the B-type short beam test pieces according to regulations for a specified time.
2) And (3) carrying out a loading test on the B-type small beam test piece, measuring the deflection during fracture, substituting the deflection into the formula (2), calculating to obtain a group of calculated bending strain values, then multiplying the calculated bending strain values by the regression coefficient alpha of the corresponding asphalt mixture type, and converting to obtain a test result equivalent to the A-type small beam test piece.
3) And removing abnormal values of the converted result and the bending strain result of the A-type trabecula test piece, and calculating the average value of the low-temperature bending strain together from the residual data to serve as the final test result.
And comprehensively evaluating the low-temperature crack resistance of the asphalt mixture according to bending strain data obtained by a trabecular test piece low-temperature bending test and a short-trabecular test piece low-temperature bending test.
Establishing a correlation between the trabecula test piece and the short beam test piece; performing regression analysis on the basis of the bending strain value to obtain a regression coefficient related to the type of the asphalt mixture, and converting the test data of the short beam test piece by using the regression coefficient to be used as sample data; the test cost is saved, the using amount of the trabecula test piece can be reduced, and the test time is shortened.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (9)
1. A low-temperature bending strain test method for an asphalt mixture trabecular test piece is characterized by comprising the following steps:
based on a low-temperature loading test of the trabecular test piece, obtaining the bending strain of the trabecular test piece, and obtaining two short and small beam test pieces after each trabecular test piece is broken;
obtaining a bending strain value of each short beam test piece based on a short beam test piece low-temperature loading test, and substituting the bending strain value of each short beam test piece into the correction coefficient of each short beam test piece and the correction coefficient of each trabecular test piece for conversion to obtain a test result equivalent to the trabecular test piece;
performing strain analysis by integrating the result of the conversion of the bending strain value of the small girder test piece and the bending strain result of the small girder test piece;
the calculation of the correction coefficient comprises the following steps:
the bending strain of the trabecular test piece is obtained, and the bending strain of the short beam test piece formed by the trabecular test piece is obtained;
the bending strain of the trabecular test piece is paired with the bending strain of the corresponding short beam test piece;
and obtaining a regression coefficient according to regression analysis as a correction coefficient.
2. The method for testing the low-temperature bending strain of the asphalt mixture trabecular test piece as claimed in claim 1, wherein a plurality of trabecular test pieces are obtained and numbered, and the deflection of the trabecular test piece when the trabecular test piece is broken is obtained through a low-temperature loading bending test, so as to obtain the maximum bending strain of the trabecular test piece.
3. The method for testing the low-temperature bending strain of the asphalt mixture trabecular test piece as claimed in claim 1, wherein the numbering is carried out according to two short beam test pieces obtained after each trabecular test piece is subjected to the loading test, and the numbering of the short beam test pieces corresponds to the numbering of the original trabecular test pieces.
4. The method for testing the low-temperature bending strain of the asphalt mixture trabecular test piece as claimed in claim 3, wherein the trabecular test piece is broken into two short beam test pieces from midspan after a loading test, and the short beam test pieces are treated and then subjected to heat preservation maintenance.
5. The method for testing the low-temperature bending strain of the asphalt mixture trabecular test piece as claimed in claim 1, wherein the bending strain value of each short trabecular test piece is calculated according to the deflection of the short trabecular test piece during the low-temperature loading test for fracture, and the arithmetic average value of the bending strain values of two short trabecular test pieces corresponding to the same trabecular test piece is obtained.
6. The method for testing the low-temperature bending strain of the bituminous mixture trabecular test piece as claimed in claim 1, wherein a scatter diagram is drawn in a rectangular coordinate system, and regression analysis is performed according to a scatter distribution rule.
7. The method for testing the low-temperature bending strain of the bituminous mixture trabecular test piece as claimed in claim 6, wherein the regression analysis is performed according to the scatter distribution selection function to obtain the regression coefficient related to the bituminous mixture type.
8. The method for testing the low-temperature bending strain of the asphalt mixture trabecular test piece as claimed in claim 1, wherein abnormal values are removed from the conversion result of the bending strain of the trabecular test piece and the bending strain result of the trabecular test piece.
9. The method for testing the low-temperature bending strain of the asphalt mixture trabecular test piece as claimed in claim 8, wherein the average value of the data of the reserved bending strain is calculated after abnormal value processing is performed, and the average value is used as the test result.
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