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CN109613046B - Method for evaluating dispersibility of steel fibers in asphalt concrete - Google Patents

Method for evaluating dispersibility of steel fibers in asphalt concrete Download PDF

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CN109613046B
CN109613046B CN201811510528.8A CN201811510528A CN109613046B CN 109613046 B CN109613046 B CN 109613046B CN 201811510528 A CN201811510528 A CN 201811510528A CN 109613046 B CN109613046 B CN 109613046B
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asphalt concrete
temperature
dispersibility
steel fibers
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王振军
高杰
王笑风
郭豪彦
杨博
徐鸥明
万晨光
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Changan University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
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    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/44—Sample treatment involving radiation, e.g. heat
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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Abstract

本发明公开了一种钢纤维在沥青混凝土中分散性的评价方法.方法包括制备含钢纤维的沥青混凝土试件；对试件进行切割；对试件的切割断面进行微波处理；采集微波处理后的切割断面的温度场数据，所得温度场数据构成温度数据集合T；采用式(1)对钢纤维在沥青混凝土中分散性进行评价。本发明提供的一种快速评价钢纤维在沥青混合料中分散均匀性的评价方法，可用于为钢纤维沥青混混凝土的生产、设计和质检。

Figure DDA0001900627700000011

Figure 201811510528

The invention discloses a method for evaluating the dispersibility of steel fibers in asphalt concrete. The method includes preparing an asphalt concrete specimen containing steel fibers; cutting the specimen; performing microwave treatment on the cut section of the specimen; The temperature field data of the cutting section of , the obtained temperature field data constitutes the temperature data set T; the dispersibility of steel fibers in asphalt concrete is evaluated by formula (1). The invention provides an evaluation method for rapidly evaluating the dispersion uniformity of steel fibers in an asphalt mixture, which can be used for the production, design and quality inspection of steel fiber asphalt concrete.

Figure DDA0001900627700000011

Figure 201811510528

Description

Method for evaluating dispersibility of steel fibers in asphalt concrete
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a method for evaluating dispersibility of steel fibers in an asphalt mixture.
Background
The steel fiber reinforced asphalt concrete is a novel pavement material, and has excellent physical and mechanical properties such as high strength, crack resistance, freezing resistance and the like compared with the traditional asphalt concrete. Meanwhile, due to the conductivity of the steel fibers, the steel fiber asphalt concrete is also used for paving a snow-melting road surface with an electrothermal effect. It is known that steel fibers are not uniformly dispersed in asphalt concrete, and the non-uniform dispersion of steel fibers often causes the performance of steel fiber asphalt concrete to be deteriorated, so that the added steel fibers cannot be fully utilized. Therefore, it is very important to quantitatively evaluate the dispersibility of the steel fibers in concrete.
The existing method for evaluating the dispersibility of steel fibers in the asphalt mixture is to detect the dispersion condition of the steel fibers in a test piece by CT tomography. Generally speaking, because the density of a test piece is high, the power of a common CT machine is not enough to penetrate through an asphalt mixture test piece, and an industrial CT machine is required to be used, the requirement of the method on equipment is high; on the other hand, CT observation is expensive and is difficult to be widely used in actual engineering.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the invention provides a method for evaluating the dispersibility of steel fibers in asphalt concrete.
The method provided by the invention comprises the following steps: preparing an asphalt concrete test piece containing steel fibers; cutting the test piece; carrying out microwave treatment on the cut section of the test piece; collecting temperature field data of the cutting section after microwave treatment, wherein the obtained temperature field data form a temperature data set T; t (n, m) is the temperature value of the coordinate point (n, m) on the cutting section; the dispersibility of steel fibers in asphalt concrete was evaluated by the formula (1):
Figure BDA0001900627680000021
in formula (1):
θ＝0.55ε+0.25μ+0.2NTD；
Figure BDA0001900627680000022
t (N, M) belongs to T, T is the average value of all elements in the set T, N is the maximum value of N, M is the maximum value of M, and I is the total number of the elements in the set T;
Figure BDA0001900627680000023
tmaxis the maximum value in the set T; t is tminIs the minimum value in the set T;
Figure BDA0001900627680000024
q∈[1,Q]q is the total number of temperature peaks in the set T, DqIs the average value of the distances between the position of the q temperature peak and the positions of other temperature peaks, mm.
Preferably, the peak temperature value of the invention is more than or equal to 70 percent T in the set Tmax-80％tmaxThe temperature value of (2).
In some embodiments, in the method of the present invention, the test piece is cut for multiple times to obtain multiple cut sections, and temperature field data acquisition is performed on each cut section, where ∈ μ, and NTD in formula (1) are average values of the multiple cut sections.
In some embodiments, the test piece of the present invention is cylindrical and is cut along a radial cross section of the test piece.
Preferably, when the microwave treatment is carried out in the method, the microwave emission direction is vertical to the cutting section of the test piece.
Preferably, the initial temperature of the test piece is 5-40 ℃ before microwave treatment by the method.
The technical scheme provided by the invention is beneficial to quickly, effectively and accurately judging whether the steel fibers present ideal distribution uniformity in the asphalt mixture or not in the material design and production stages of the steel fiber asphalt mixture. The method has positive significance for improving the utilization rate of the steel fibers and ensuring the quality, the mechanical property and the durability of the steel fiber asphalt mixture.
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The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
FIG. 1 is an infrared image of each cut surface of examples 1 to 5, wherein 1, 2, 3, 4 and 5 represent example numbers, A represents a first cut surface, B represents a second cut surface and C represents a third cut surface.
Detailed Description
All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Unless otherwise limited by the specific context, for purposes of this invention, the meanings of some of the terms used in this document are as follows:
the steel fiber asphalt concrete is asphalt concrete added with steel fibers, and the grading type range of the asphalt concrete is dense-graded asphalt mixture, open-graded asphalt mixture and closed-graded asphalt mixture, wherein the aggregate type can be lithologic aggregate such as limestone, basalt, diabase, granite and the like; asphalt refers to any asphalt on the market; the steel fiber is the steel fiber meeting the requirements of steel fiber for concrete (YB/T151-1999).
The preparation method of the test piece is a pouring method in the field of building or traffic, and mainly comprises the following steps: compounding, blending, injection molding, forming, and the like. The shape of the test piece can meet the subsequent measurement requirements, and for example, a square column shape or a cylindrical shape can be selected. The specimen cutting location is a randomly selected location on the specimen to ensure objectivity and representativeness of the measurement.
The data of the temperature field is collected and analyzed by corresponding analysis software, such as the matching analysis software of a thermal infrared imager. The obtained temperature field data form a temperature data set T ═ { T (N, M) | N ≦ N, M ≦ M }, elements in the set are temperature values of corresponding coordinate positions (N, M) on the cutting section, the coordinate positions can be set at equal intervals according to the result requirement, and in this case, the values of the two-dimensional coordinates are natural numbers. Of course, the maximum values of the coordinate values, namely N and M, can be automatically set by adopting software, wherein the maximum values of the coordinate values are determined by the size of each cut section.
The temperature peak values involved in the method can be selected according to the overall data condition, so that the number of the selected temperature peak values meets the result requirement, and generally the selected temperature value is 70 percent tmax-80％tmaxAs a temperature peak.
The invention is further illustrated by the following specific examples.
The following are examples given by the inventors, and it should be understood by those skilled in the art that these examples are only for the purpose of fully understanding the present invention by those skilled in the art, and are not intended to limit the scope of the present invention.
Examples 1 to 5:
(1) production of test pieces
Examples 1-5 differ in the material ratios and the detailed material compositions are shown in table 1.
TABLE 1 Material ratios of the mixtures to be tested
Figure BDA0001900627680000041
The mixture ratio shown in Table 1 was adopted to form Marshall specimens of steel fiber asphalt mixture according to the requirements of JTG E20-2011 road engineering asphalt and asphalt mixture test regulations. The test piece is a cylindrical test piece with the height of 63.5 +/-1.3 mm and the diameter of 101.6 +/-0.2 mm.
(2) The cylindrical marshall test piece was cut in the diameter direction with a circular cut section, and each test piece was cut 3 times. The cutting position of the test piece was randomly selected. In the embodiment, the position of the first cutting section of each test piece is 1.5cm away from the top of the test piece, the part above the cutting section is discarded, and the test piece is cut for the second time, wherein the position of the cutting section is 3.5cm away from the top of the test piece; likewise, the third cut section was located 5.5cm from the top of the test piece.
(3) And placing the cut test piece into a microwave oven for heating, wherein the test piece is placed in a magnetron with a cutting section parallel to the right side of the inner cavity of the microwave oven, so that the microwave irradiates the cutting section as vertically as possible. In examples 1 to 5, the microwave oven power was 800W, the microwave frequency was 2.45GHz, the irradiation time was 20 seconds, and the initial temperature of the test piece before heating was 5 to 40 ℃.
(4) And recording temperature field data at the cutting section by adopting an infrared thermal imager to form a temperature data set.
In the embodiments 1 to 5, the temperature field data is imported into the software matched with the thermal imager, the background temperature field is removed, and the temperature field data at the cutting section is reserved. And outputting temperature field data at the cutting section to form a temperature data set. The technical performance of the infrared thermal imaging cameras in the examples 1 to 5 is as follows: the spatial resolution is 5mrad, the thermal sensitivity is not more than 0.05 ℃, the temperature measurement range is minus 10 ℃ to plus 200 ℃, and the error is plus or minus 1.2 ℃. The infrared image obtained by the shooting is shown in fig. 1.
(5) The dispersibility of steel fibers in asphalt concrete was evaluated by the formula (1):
Figure BDA0001900627680000051
in formula (1):
θ＝0.55ε+0.25μ+0.2NTD；
Figure BDA0001900627680000052
t (N, M) belongs to T, T is the average value of all elements in the set T, N is the maximum value of N, M is the maximum value of M, and I is the total number of the elements in the set T;
Figure BDA0001900627680000061
tmaxis the maximum value in the set T, DEG C; t is tminIs the minimum value in the set T, DEG C;
Figure BDA0001900627680000062
q∈[1,Q]，
Figure BDA0001900627680000063
p∈[1,Q]q is not equal to p; wherein Q is the total number of temperature peak values in the set T; dq-pThe distance from the position of the q temperature peak value to the position of the p temperature peak value is mm; dqIs the average of the distances between the location of the q temperature peak and the locations of the peaks of the other temperatures, mm.
The measured and calculated values of the above parameters in examples 1 to 5 are shown in tables 2 to 6.
TABLE 2 calculation of ε in examples 1-5
Figure BDA0001900627680000064
TABLE 3 calculation of μ in examples 1 to 5
Figure BDA0001900627680000071
TABLE 4 average spacing NTD of adjacent temperature peaks in examples 1-5
Figure BDA0001900627680000072
Figure BDA0001900627680000081
Examples 1-5 wherein the temperature peaks are 75% T or more of the temperature data set TmaxThe temperature value of (2).
TABLE 5 Steel fiber Dispersion coefficient θ in examples 1-5
Examples θ
1 11.97
2 8.51
3 16.85
4 5.85
5 11.62
In examples 1 to 5, the degree of dispersion of the steel fibers was evaluated as shown in Table 6.
TABLE 6 evaluation of Steel fiber Dispersion
Numbering Evaluation of degree of dispersibility
1 Good dispersion
2 Good dispersion
3 Poor dispersion
4 Uniformly dispersed
5 Good dispersion

Claims (6)

1.一种钢纤维在沥青混凝土中分散性的评价方法，其特征在于，方法包括：1. an evaluation method of steel fiber dispersibility in asphalt concrete, is characterized in that, method comprises: 制备含钢纤维的沥青混凝土试件；Preparation of asphalt concrete specimens containing steel fibers; 对试件进行切割；cutting the test piece; 对试件的切割断面进行微波处理；Microwave treatment of the cut section of the specimen; 采集微波处理后的切割断面的温度场数据，构成温度数据集合T；Collect the temperature field data of the cut section after microwave processing to form a temperature data set T; 采用式(1)对钢纤维在沥青混凝土中分散性进行评价：Equation (1) was used to evaluate the dispersibility of steel fibers in asphalt concrete:
Figure FDA0002791755460000011
Figure FDA0002791755460000011
 式(1)中：In formula (1): θ＝0.55ε+0.25μ+0.2NTD；θ=0.55ε+0.25μ+0.2NTD;
Figure FDA0002791755460000012
t为集合T内所有元素的平均值，t(n，m)为切割断面上坐标点(n，m)的温度值，N为n的最大取值，M为m的最大取值，I为集合T内元素的总个数；
Figure FDA0002791755460000012
t is the average value of all elements in the set T, t(n, m) is the temperature value of the coordinate point (n, m) on the cutting section, N is the maximum value of n, M is the maximum value of m, and I is the maximum value of m. The total number of elements in the set T;
Figure FDA0002791755460000013
tmax为集合T中的最大值；tmin为集合T中的最小值；
Figure FDA0002791755460000013
t max is the maximum value in the set T; t min is the minimum value in the set T;
Figure FDA0002791755460000014
Q为集合T内温度峰值的总个数，Dq为q温度峰值所在位置与其他温度峰值所在位置之间的距离的平均值，mm。
Figure FDA0002791755460000014
Q is the total number of temperature peaks in the set T, D q is the average distance between the position of the q temperature peak and the positions of other temperature peaks, mm. 2.如权利要求1所述的钢纤维在沥青混凝土中分散性的评价方法，其特征在于，所述温度峰值为集合T中大于等于75％tmax的温度值。2 . The method for evaluating the dispersibility of steel fibers in asphalt concrete according to claim 1 , wherein the temperature peak value is a temperature value in the set T that is greater than or equal to 75% t max . 3 . 3.如权利要求1所述的钢纤维在沥青混凝土中分散性的评价方法，其特征在于，对试件进行多次切割，得到多个切割断面，对每个切割断面进行温度场数据采集，式(1)中ε、μ和NTD均取多个切割断面的平均值。3. the evaluation method of the dispersibility of steel fiber in asphalt concrete as claimed in claim 1, is characterized in that, the test piece is cut many times to obtain a plurality of cutting sections, and temperature field data collection is carried out to each cutting section, In formula (1), ε, μ and NTD are the average values of multiple cut sections. 4.如权利要求1或3所述的钢纤维在沥青混凝土中分散性的评价方法，其特征在于，所述试件为圆柱形，切割时沿试件的径向截面进行切割。4. The method for evaluating the dispersibility of steel fibers in asphalt concrete according to claim 1 or 3, wherein the test piece is cylindrical, and the cutting is performed along the radial section of the test piece. 5.如权利要求1所述的钢纤维在沥青混凝土中分散性的评价方法，其特征在于，微波处理时，微波发射方向垂直试件的切割断面。5 . The method for evaluating the dispersibility of steel fibers in asphalt concrete according to claim 1 , wherein, during microwave treatment, the microwave emission direction is perpendicular to the cutting section of the specimen. 6 . 6.如权利要求1所述的钢纤维在沥青混凝土中分散性的评价方法，其特征在于，微波处理前，试件的初始温度是5～40℃。6 . The method for evaluating the dispersibility of steel fibers in asphalt concrete according to claim 1 , wherein the initial temperature of the test piece is 5-40° C. before microwave treatment. 7 .
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CN112557244B (en) * 2020-11-21 2023-10-27 扬州大学 Method for evaluating the uniformity of basalt fiber dispersion in asphalt mixtures
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