CN103575752B - A kind of evaluating asphalt mixture homogeneity - Google Patents

A kind of evaluating asphalt mixture homogeneity Download PDF

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CN103575752B
CN103575752B CN201310542528.7A CN201310542528A CN103575752B CN 103575752 B CN103575752 B CN 103575752B CN 201310542528 A CN201310542528 A CN 201310542528A CN 103575752 B CN103575752 B CN 103575752B
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CN103575752A (en
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彭勇
王振
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Zhejiang University ZJU
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Abstract

The invention discloses a kind of evaluating asphalt mixture homogeneity, first shaping in indoor or the on-site sampling of the method provides the cylinder specimen of the asphalt needed for analysis, then the cross-sectional image of bitumen mixture specimen is gathered by Industrial CT Machine or digital camera, when using the latter, bitumen mixture specimen needs the cutting of first jagsaw teeth cutter; Again image is converted into the black white image of BMP form.Analyze this black white image, obtain each in asphalt cross-sectional image gathering materials and the information of hole, as girth, area, equivalent diameter, major axis minor axis coordinate, centroid position coordinate etc.Finally just to gather materials in compound and the position distribution of hole, distributed number, major axis orientation angle three aspects that distribute calculate respectively and compound cross section gather materials and the distribution of hole, evaluate mixture uniformity whereby.The present invention is based on Digital image technology, the homogeneity directly for asphalt carries out quantitative evaluation, compares additive method, and evaluation result is more accurate.

Description

A kind of evaluating asphalt mixture homogeneity
Technical field
The invention belongs to field of road, particularly relate to a kind of method for quantitatively evaluating of Homogeneity of Asphalt Mixture.
Background technology
The degree of uniformity of asphalt is directly connected to mechanical property and the serviceable life of bituminous pavement.Potentially cause in the factor of hot-mixed bitumen pavement early damage many, the most seriously unevenness of asphalt.The grating of gathering materials in uneven asphalt and (or) bitumen content do not conform to the requirement in initial on-the-spot match ratio, cause the density of compound and voidage to alter a great deal.Research shows: when asphalt is uneven, and the stiffness of compound, pulling strengrth and fatigue lifetime decline, and the service life on road surface reduces, thus accelerates the earlier period damage on road surface.
Asphalt is gathered materials by pitch, thickness, adjuvant and space four-component form.The unevenness of asphalt is the concentrated expression of constituent unevenness in asphalt.People are not used as the homogeneity of asphalt as a serious problem and treat traditionally, and not adopting rigid measures is controlled, conscientious just passable when just requiring construction.And along with the increase of the volume of traffic, homogeneity has become one of principal element determining pavement quality, should attention is thoroughly aroused to.To ascribe road surface voidage to excessive for the main cause damaged by road surface early water, and to ascribe compactness to inadequate by excessive for voidage again, and compacting is not enough, and this is the excessive main cause of early stage road surface voidage really, but solves than being easier to; In fact, the unevenness of asphalt is not only another main cause causing local porosity excessive, and is more insoluble technical matters.Once unevenness appears in asphalt, all effort about design of material all become has made a futile effort.The deficiency of compactness of pavement, is also that compound unevenness causes sometimes, only detects the mean pressure solidity on road surface, often can not reflect problem objectively, also should consider its variability.When the uneven generation of asphalt, only rely on and improve compactness and be difficult to reach the object reducing voidage, even can cause aggregate crusher and real that it is anti-.
Search existing achievement in research and documents and materials, regrettably, at present, it is not also a lot of for determining quantifier elimination to Homogeneity of Asphalt Mixture both at home and abroad.Study carefully its reason, except above-mentioned traditional understanding, following 3 aspect factors may be also had: the research of (1) Homogeneity of Asphalt Mixture is a complicated problem, it to relate to face very wide, systematically research is got up more difficult.(2) be confined to traditional research method, quantitative examination Homogeneity of Asphalt Mixture is very difficult.(3) although, a lot of country progressively recognizes the importance of Homogeneity of Asphalt Mixture in the world at present, but in some countries of high latitude, as Britain, Belgium, Holland, France etc., when Asphalt Mixture Design, custom adopts thinner gathering materials and continuous grading (except SMA), and nominal maximum particle diameter is not more than 20mm, the heterogeneity of asphalt is not subject matter in these countries, therefore not too high to the enthusiasm of mixture uniformity expansion research.
At present, in limited Homogeneity of Asphalt Mixture quantitative examination, the selection of its Evaluation for Uniformity index parameter with determine inadequate science, consider comprehensive not, representativeness is strong, and result has deviation, partly can only reflect the actual conditions of Homogeneity of Asphalt Mixture.
Summary of the invention
In order to overcome the limitation of existing evaluation method, the invention provides a kind of evaluating asphalt mixture homogeneity.
The present invention solves the scheme that its problem adopts: a kind of evaluating asphalt mixture homogeneity, and the method is specially: indoor shaping or on-site sampling provides the cylinder specimen of the asphalt needed for analysis; Gathered the cross-sectional image of bitumen mixture specimen by Industrial CT Machine or digital camera, when using the latter, bitumen mixture specimen needs the cutting of first jagsaw teeth cutter; Image is converted into the black white image of BMP form.Analyze this black white image, obtain each in asphalt cross-sectional image gathering materials and the information of hole, as girth, area, equivalent diameter, major axis minor axis coordinate, centroid position coordinate etc.Obtain on above-mentioned compound cross section gather materials and hole information after, just to gather materials in compound and the position distribution of hole, distributed number, major axis orientation angle three aspects that distribute calculate respectively and compound cross section gather materials and the distribution of hole, evaluate mixture uniformity whereby.
The invention has the beneficial effects as follows: the present invention is based on Digital image technology, the homogeneity directly for asphalt carries out quantitative evaluation, compares additive method, and evaluation result is more accurate.
Accompanying drawing explanation
Fig. 1 is that the present invention divides asphalt horizontal section schematic diagram;
Fig. 2 is that the present invention divides asphalt vertical section schematic diagram.
Embodiment
Evaluating asphalt mixture homogeneity of the present invention, is specially: indoor shaping or on-site sampling provides the cylinder specimen of the asphalt needed for analysis; Gathered the cross-sectional image of bitumen mixture specimen by Industrial CT Machine or digital camera, when using the latter, bitumen mixture specimen needs the cutting of first jagsaw teeth cutter; Image is converted into the black white image of BMP form.Analyze this black white image, obtain each in asphalt cross-sectional image gathering materials and the information of hole, as girth, area, equivalent diameter, major axis minor axis coordinate, centroid position coordinate etc.Obtain on above-mentioned compound cross section gather materials and hole information after, just to gather materials in compound and the position distribution of hole, distributed number, major axis orientation angle three aspects that distribute calculate respectively and compound cross section gather materials and the distribution of hole, evaluate mixture uniformity whereby.
The range deviation rate at the center of gravity that the position distribution state that on cross section, each shelves gather materials is gathered materials by this grade and this cross section geometric center is weighed.Described computing formula is as follows:
The range deviation of center of gravity of gathering materials and geometric center:
Range deviation S is converted to nondimensional r:r i=S i/ R
In formula: be respectively i-th grade of barycentric coordinates of gathering materials, i is the size of mesh (square hole screen) of gathering materials;
x in, y inbe respectively i-th grade gather materials in the center-of-mass coordinate position of the n-th particle; N iit is the sum of i-th grade of middle particle that gathers materials; S ifor the range deviation of center of gravity that on cross section, i-th grade is gathered materials and geometric center; x pC, y pCfor horizontal ordinate and the ordinate of the geometric center in cross section; r ifor the range deviation rate of center of gravity that on cross section, i-th grade is gathered materials and geometric center; R is the distance of geometric center to section edges.
Cross section symmetry is divided into quartern region, adds up these shelves of each region respectively and to gather materials number, utilize following formula to calculate each shelves respectively and to gather materials the number distribution situation in each region:
(5) if N 1i=N 3i, N 2i=N 4i, then
t i = | N 1 i - N 2 i | N i , N 1i≠0,N 2i≠0
t i = [ 1 + λ ( N 1 i + N 2 i ) ] | N 1 i - N 2 i | N i , N 1i=0 or N 2i=0
(6) if N 1i≠ N 3i, N 2i≠ N 4i, then
t i = c · | N 1 i - N 3 i | + | N 2 i - N 4 i | N i ,
Work as N 1i=N 3i=0 or N 2i=N 4iwhen=0,
In other situations, c=1.
In formula: N 1i, N 2i, N 3i, N 4ibe respectively i-th grade of distributed quantity gathered materials in four pieces of regions; t ibe i-th grade of distributed number condition parameter of gathering materials in four pieces of regions; λ is undetermined coefficient, generally gets 0.1; N iit is the sum of i-th grade of middle particle that gathers materials.
On computing nodes, in four regions, each gear gathers materials the average at major axis orientation angle respectively, represents these shelves of this region to gather materials azimuthal principal direction with this, and the position relationship calculating adjacent and opposed area principal direction to gather materials major axis orientation angle distribution as evaluation.Azimuthal distribution of gathering materials state is good, then principal direction symmetry of gathering materials in the vertical and opposed area of principal direction of cross section gathering materials in adjacent area.Be divided into two kinds of situations, described computing formula is as follows:
(5) if N i>0, then
For one, three regions:
9) if a 1 i ‾ - a 3 i ‾ > π 2 , S 13 i = π - ( a 1 i ‾ - a 3 i ‾ ) π / 2 ;
10) if 0 &le; a 1 i &OverBar; - a 3 i &OverBar; < &pi; 2 , S 13 i = a 1 i &OverBar; - a 3 i &OverBar; &pi; / 2 ;
11) if - &pi; 2 < a 1 i &OverBar; - a 3 i &OverBar; < 0 , S 13 i = a 3 i &OverBar; - a 1 i &OverBar; &pi; / 2
12) if a 1 i &OverBar; - a 3 i &OverBar; < - &pi; 2 , S 13 i = &pi; + ( a 1 i &OverBar; - a 3 i &OverBar; ) &pi; / 2
For two, four regions:
9) if a 2 i &OverBar; - a 4 i &OverBar; > &pi; 2 , S 24 i = &pi; - ( a 2 i &OverBar; - a 4 i &OverBar; ) &pi; / 2 ;
10) if 0 &le; a 2 i &OverBar; - a 4 i &OverBar; < &pi; 2 , S 24 i = a 2 i &OverBar; - a 4 i &OverBar; &pi; / 2 ;
11) if - &pi; 2 < a 2 i &OverBar; - a 4 i &OverBar; < 0 , S 24 i = a 4 i &OverBar; - a 2 i &OverBar; &pi; / 2
12) if a 2 i &OverBar; - a 4 i &OverBar; < - &pi; 2 , S 24 i = &pi; + ( a 2 i &OverBar; - a 4 i &OverBar; ) &pi; / 2
For one, two regions:
9) if a 1 i &OverBar; - a 2 i &OverBar; > &pi; 2 , S 12 i = ( a 1 i &OverBar; - a 2 i &OverBar; ) - &pi; / 2 &pi; / 2 ;
10) if 0 &le; a 1 i &OverBar; - a 2 i &OverBar; < &pi; 2 , S 12 i = &pi; / 2 - ( a 1 i &OverBar; - a 2 i &OverBar; ) &pi; / 2 ;
11) if - &pi; 2 < a 1 i &OverBar; - a 2 i &OverBar; < 0 , S 12 i = &pi; / 2 + ( a 1 i &OverBar; - a 2 i &OverBar; ) &pi; / 2
12) if a 1 i &OverBar; - a 2 i &OverBar; < - &pi; 2 , S 12 i = - &pi; / 2 - ( a 1 i &OverBar; - a 2 i &OverBar; ) &pi; / 2
S i=S 13i+S 24i+S 12i
(6) if N i=0, S i=0;
In formula: be respectively i-th grade of azimuthal average gathered materials in four pieces of regions, i.e. azimuthal principal direction, s 1i, S 2i, S 3i, S 4ibe respectively i-th grade of position angle summation of gathering materials in four pieces of regions; N 1i, N 2i, N 3i, N 4ibe respectively i-th grade of distributed quantity gathered materials in four pieces of regions; S 13i, S 24i, S 12ibeing respectively i-th grade gathers materials in one, three regions, the evaluation number of two, four regions and the distribution of one, two zone aspect angles; S iit is the evaluation index of i-th grade of azimuthal distribution of gathering materials.
The distribution index that cross section gathers materials is:
d a=η×∑ki×(ri+ti+si)
In formula: d afor distribution index of gathering materials in asphalt; η is a undetermined coefficient relevant to aggregate grading; k ifor the area ratio that on cross section, i-th grade is gathered materials; r ifor the range deviation rate of center of gravity that on cross section, i-th grade is gathered materials and geometric center; t ibe i-th grade of distributed number condition parameter of gathering materials in four pieces of regions; s iit is the evaluation number of i-th grade of azimuthal distribution of gathering materials.
Be similar to the computing method of distribution of gathering materials, on cross section, the position distribution state of all kinds of hole is weighed by the center of gravity of such hole and the range deviation rate at this cross section geometric center.Described computing formula is as follows:
The range deviation of hole center of gravity and geometric center:
Range deviation S ' is converted to nondimensional r ': r ' i=S ' i/ R
In formula: S ' ifor the center of gravity of the i-th class hole on cross section and the range deviation of geometric center; be respectively the barycentric coordinates of the i-th class hole, x ' in, y ' inbe respectively the center-of-mass coordinate position of the n-th particle in the i-th class hole; N ' iit is the sum of particle in the i-th class hole; x pC, y pCfor the geometric center position coordinates in cross section; R ' ifor the center of gravity of the i-th class hole on cross section and the range deviation rate of geometric center; R is the distance of geometric center to section edges.K i' be the area ratio of the i-th class hole on cross section, k ' i=a ' i/ a '; A ' ifor the total area of the i-th class hole on cross section; A ' is the total area of hole all kinds of on cross section;
Cross section symmetry is divided into quartern region, adds up such number of apertures of each region respectively, utilize following formula to calculate the number distribution situation of all kinds of hole in each region respectively:
(7) if N ' 1i=N ' 3i, N ' 2i=N ' 4i, then
t i ' = | N 1 i ' - N 2 i ' | N i ' , N′ 1i≠0,N′ 2i≠0
t i ' = [ 1 + &lambda; ' &CenterDot; ( N 1 i ' + N 2 i i ) ] | N 1 i ' - N 2 i ' | N i ' , N ' 1i=0 or N ' 2i=0
(8) if N ' 1i≠ N ' 3ior N ' 2i≠ N ' 4i, then
t i ' = c &CenterDot; | N 1 i ' - N 3 i ' | + | N 2 i ' - N 4 i ' | N i '
As N ' 1i=N ' 3i=0 or N ' 2i=N ' 4iwhen=0, in other situations, c '=1.
In formula: N ' 1i, N ' 2i, N ' 3i, N ' 4ibe respectively the distributed quantity of the i-th class hole in four pieces of regions; T ' ibe the distributed number condition parameter of the i-th class hole in four pieces of regions; λ ' is undetermined coefficient, generally gets 0.1; N ' ithe same.
Respectively the average at each gear hole major axis orientation angle in four regions on computing nodes, represents the azimuthal principal direction of such hole of this region with this, calculates the position relationship of adjacent and opposed area principal direction as evaluation hole major axis orientation angle distribution.Hole azimuthal distribution state is good, then vertical the and opposed area inner pore principal direction symmetry of adjacent area inner pore principal direction on cross section.Be divided into two kinds of situations, described computing formula is as follows:
(7) if N ' i>0, then
For one, three regions:
13) if a 1 i &OverBar; ' - a 3 i &OverBar; ' > &pi; 2 , S 13 i ' = &pi; - ( a 1 i &OverBar; ' - a 3 i &OverBar; ' ) &pi; / 2 ;
14) if 0 &le; a 1 i &OverBar; ' - a 3 i &OverBar; ' < &pi; 2 , S 13 i ' = a 1 i &OverBar; ' - a 3 i &OverBar; ' &pi; / 2 ;
15) if - &pi; 2 < a 1 i &OverBar; ' - a 3 i &OverBar; ' < 0 , S 13 i ' = a 3 i &OverBar; ' - a 1 i &OverBar; ' &pi; / 2
16) if a 1 i &OverBar; ' - a 3 i &OverBar; ' < - &pi; 2 , S 13 i ' = &pi; + ( a 1 i &OverBar; ' - a 3 i &OverBar; ' ) &pi; / 2
For two, four regions:
13) if a 2 i &OverBar; ' - a 4 i &OverBar; ' > &pi; 2 , S 24 i ' = &pi; - ( a 2 i &OverBar; ' - a 4 i &OverBar; ' ) &pi; / 2 ;
14) if 0 &le; a 2 i &OverBar; ' - a 4 i &OverBar; ' < &pi; 2 , S 24 i ' = a 2 i &OverBar; ' - a 4 i &OverBar; ' &pi; / 2 ;
15) if - &pi; 2 < a 2 i &OverBar; ' - a 4 i &OverBar; ' < 0 , S 24 i ' = a 2 i &OverBar; ' - a 4 i &OverBar; ' &pi; / 2
16) if a 2 i &OverBar; ' - a 4 i &OverBar; ' < - &pi; 2 , S 24 i ' = &pi; + ( a 2 i &OverBar; ' - a 4 i &OverBar; ' ) &pi; / 2
For one, two regions:
13) if a 1 i &OverBar; ' - a 2 i &OverBar; ' > &pi; 2 , S 12 i ' = ( a 1 i &OverBar; ' - a 2 i &OverBar; ' ) - &pi; / 2 &pi; / 2 ;
14) if 0 &le; a 1 i &OverBar; &prime; - a 2 i &OverBar; &prime; < &pi; 2 , S 12 i &prime; = &pi; / 2 - ( a 1 i &OverBar; &prime; - a 2 i &OverBar; &prime; ) &pi; / 2 ;
15) if - &pi; 2 &le; a 1 i &OverBar; ' - a 2 i &OverBar; ' < 0 , S 12 i ' = &pi; / 2 + ( a 1 i &OverBar; ' - a 2 i &OverBar; ' ) &pi; / 2 ;
16) if a 1 i &OverBar; &prime; - < a 2 i &OverBar; &prime; < - &pi; 2 , S 12 i &prime; = - &pi; / 2 - ( a 1 i &OverBar; &prime; - a 2 i &OverBar; &prime; ) &pi; / 2 ;
S′ i=S′ 13i+S′ 24i+S′ 12i
(8) if N ' i=0, S ' i=0;
In formula: be respectively the azimuthal average of the i-th class hole in four pieces of regions, i.e. azimuthal principal direction, a 1 i &OverBar; &prime; = S 1 i &prime; / N 1 i &prime; , a 2 i &OverBar; &prime; = S 2 i &prime; / N 2 i &prime; , a 3 i &OverBar; &prime; = S 3 i &prime; / N 3 i &prime; , a 4 i &OverBar; &prime; = S 4 i &prime; / N 4 i &prime; , ; S ' 1i, S ' 2i, S ' 3i, S ' 4ibe respectively the position angle summation of the i-th class hole in four pieces of regions; N ' 1i, N ' 2i, N ' 3i, N ' 4ibe respectively the distributed quantity of the i-th class hole in four pieces of regions; S ' 13i, S ' 24i, S ' 12ibe respectively the i-th class hole in one, three regions, the evaluation number of two, four regions and the distribution of one, two zone aspect angles; S ' iit is the evaluation index of the i-th class hole azimuthal distribution.
On cross section, the distribution index of hole is:
d p=η′×∑k′ i×(r′ i+t′ i+S′ i)
In formula: d afor asphalt mesoporosity distribution index; η ' is a undetermined coefficient relevant to pore-size; K ' ifor the area ratio of the i-th class hole on cross section, k i=a i/ a; Ai is i-th grade of total area gathered materials on cross section; A is the total area that on cross section, each shelves gather materials; R ' ifor the center of gravity of the i-th class hole on cross section and the range deviation rate of geometric center; T ' ibe the distributed number condition parameter of the i-th class hole in four pieces of regions; S ' iit is the evaluation number of the i-th class hole azimuthal distribution.
On cross section, mixture uniformity index d is:
d=d a+d p
Mixture uniformity on this direction is characterized with mixture uniformity in one group of parallel cut.The overall homogeneity of asphalt carries out comprehensive evaluation by compound horizontal direction and vertical direction homogeneity.
Computing formula is as follows:
D=α×d h+β×d v
In formula: D is Homogeneity of Asphalt Mixture index; α, β are respectively horizontal direction and vertical direction mixture uniformity to the weight of overall homogeneity; d h, d vbe respectively asphalt horizontal direction and vertical direction uniformity index.
d h=∑γ h(i-i)×d h(i-i)
d v=∑γ v(i-i)×d v(i-i)
In formula, γ h (i-i), γ v (i-i)be respectively level and vertical direction i-th cross section mixture uniformity to the influence coefficient of overall homogeneity; d h (i-i), d v (i-i)be respectively level and vertical direction i-th cross section mixture uniformity index.
Homogeneity of Asphalt Mixture index D is less, and corresponding Homogeneity of Asphalt Mixture is better; Otherwise then Homogeneity of Asphalt Mixture is poorer.

Claims (1)

1. an evaluating asphalt mixture homogeneity, is characterized in that, the method is specially: indoor shaping or on-site sampling provides the cylinder specimen of the asphalt needed for analysis; Gathered the cross-sectional image of bitumen mixture specimen by Industrial CT Machine or digital camera, when using the latter, bitumen mixture specimen needs the cutting of first jagsaw teeth cutter; Image is converted into the black white image of BMP form; Analyze this black white image, obtain each in asphalt cross-sectional image gathering materials and the information of hole, described in gather materials and the information of hole comprises girth, area, equivalent diameter, major axis minor axis coordinate, centroid position coordinate; Obtain on above-mentioned compound cross section gather materials and hole information after, just to gather materials in compound and the position distribution of hole, distributed number, major axis orientation angle three aspects that distribute calculate respectively and compound cross section gather materials and the distribution of hole, evaluate mixture uniformity whereby;
The range deviation rate at the center of gravity that the position distribution state that on cross section, each shelves gather materials is gathered materials by this grade and this cross section geometric center is weighed; Described computing formula is as follows:
The range deviation of center of gravity of gathering materials and geometric center:
Range deviation S is converted to nondimensional r:r i=S i/ R
In formula: be respectively i-th grade of barycentric coordinates of gathering materials, i is the size of mesh of square hole screen;
x in, y inbe respectively i-th grade gather materials in the center-of-mass coordinate position of the n-th particle; N iit is the sum of i-th grade of middle particle that gathers materials; S ifor the range deviation of center of gravity that on cross section, i-th grade is gathered materials and geometric center; x pC, y pCfor horizontal ordinate and the ordinate of the geometric center in cross section; r ifor the range deviation rate of center of gravity that on cross section, i-th grade is gathered materials and geometric center; R is the distance of geometric center to section edges;
Cross section symmetry is divided into quartern region, adds up these shelves of each region respectively and to gather materials number, utilize following formula to calculate each shelves respectively and to gather materials the number distribution situation in each region:
(1) if N 1i=N 3i, N 2i=N 4i, then
N 1i≠0,N 2i≠0
n 1i=0 or N 2i=0
(2) if N 1i≠ N 3ior N 2i≠ N 4i, then
Work as N 1i=N 3i=0 or N 2i=N 4iwhen=0,
In other situations, c=1;
In formula: N 1i, N 2i, N 3i, N 4ibe respectively i-th grade of distributed quantity gathered materials in four pieces of regions; t ibe i-th grade of distributed number condition parameter of gathering materials in four pieces of regions; λ is undetermined coefficient, gets 0.1; N iit is the sum of i-th grade of middle particle that gathers materials;
On computing nodes, in four regions, each shelves gather materials the average at major axis orientation angle respectively, represent these shelves of this region to gather materials azimuthal principal direction with this, and the position relationship calculating adjacent and opposed area principal direction to gather materials major axis orientation angle distribution as evaluation; Azimuthal distribution of gathering materials state is good, then principal direction symmetry of gathering materials in the vertical and opposed area of principal direction of cross section gathering materials in adjacent area; Be divided into two kinds of situations, described computing formula is as follows:
(1) if N i> 0, then
For one, three regions:
1) if
2) if
3) if
4) if
For two, four regions:
1) if
2) if
3) if
4) if
For one, two regions:
1) if
2) if
3) if
4) if
S i=S 13i+S 24i+S 12i
(2) if N i=0, S i=0;
In formula: be respectively i-th grade of azimuthal average gathered materials in four pieces of regions, i.e. azimuthal principal direction, s 1i, S 2i, S 3i, S 4ibe respectively i-th grade of position angle summation of gathering materials in four pieces of regions; N 1i, N 2i, N 3i, N 4ibe respectively i-th grade of distributed quantity gathered materials in four pieces of regions; S 13i, S 24i, S 12ibeing respectively i-th grade gathers materials in one, three regions, the evaluation number of two, four regions and the distribution of one, two zone aspect angles; S iit is the evaluation index of i-th grade of azimuthal distribution of gathering materials;
The distribution index that cross section gathers materials is:
d a=η×∑ki×(ri+ti+S i)
In formula: d afor distribution index of gathering materials in asphalt; η is a undetermined coefficient relevant to aggregate grading; k ifor the area ratio k that on cross section, i-th grade is gathered materials i=a i/ a, a ifor the total area that i-th on cross section grade is gathered materials, a is the total area that on cross section, each shelves gather materials; r ifor the range deviation rate of center of gravity that on cross section, i-th grade is gathered materials and geometric center; t ibe i-th grade of distributed number condition parameter of gathering materials in four pieces of regions; S iit is the evaluation index of i-th grade of azimuthal distribution of gathering materials;
Be similar to the computing method of distribution of gathering materials, on cross section, the position distribution state of all kinds of hole is weighed by the center of gravity of such hole and the range deviation rate at this cross section geometric center; Described computing formula is as follows:
The range deviation of hole center of gravity and geometric center:
Range deviation S ' is converted to nondimensional r ': r ' i=S ' i/ R
In formula: S ' ifor the center of gravity of the i-th class hole on cross section and the range deviation of geometric center; be respectively the barycentric coordinates of the i-th class hole, y ' inbe respectively the center-of-mass coordinate position of the n-th particle in the i-th class hole; N ' iit is the sum of particle in the i-th class hole; x pC, y pCfor the geometric center position coordinates in cross section; R ' ifor the center of gravity of the i-th class hole on cross section and the range deviation rate of geometric center; R is the distance of geometric center to section edges;
Cross section symmetry is divided into quartern region, adds up such number of apertures of each region respectively, utilize following formula to calculate the number distribution situation of all kinds of hole in each region respectively:
(3) if N ' 1i=N ' 3i, N ' 2i=N ' 4i, then
N′ 1i≠0,N′ 2i≠0
n ' 1i=0 or N ' 2i=0
(4) if N ' 1i≠ N ' 3ior N ' 2i≠ N ' 4i, then
As N ' 1i=N ' 3i=0 or N ' 2i=N ' 4iwhen=0, in other situations, c '=1;
In formula: N ' 1i, N ' 2i, N ' 3i, N ' 4ibe respectively the distributed quantity of the i-th class hole in four pieces of regions; T ' ibe the distributed number condition parameter of the i-th class hole in four pieces of regions; λ ' is undetermined coefficient, gets 0.1; N ' ithe same;
Respectively the average at each shelves hole major axis orientation angle in four regions on computing nodes, represents the azimuthal principal direction of such hole of this region with this, calculates the position relationship of adjacent and opposed area principal direction as evaluation hole major axis orientation angle distribution; Hole azimuthal distribution state is good, then vertical the and opposed area inner pore principal direction symmetry of adjacent area inner pore principal direction on cross section; Be divided into two kinds of situations, described computing formula is as follows:
(3) if N ' i>0, then
For one, three regions:
5) if
6) if
7) if
8) if
For two, four regions:
5) if
6) if
7) if
8) if
For one, two regions:
5) if
6) if
7) if
8) if
S′ i=S′ 13i+S′ 24i+S′ 12i
(4) if N ' i=0, S ' i=0;
In formula: be respectively the azimuthal average of the i-th class hole in four pieces of regions, i.e. azimuthal principal direction, s ' 1i, S ' 2i, S ' 3i, S ' 4ibe respectively the position angle summation of the i-th class hole in four pieces of regions; N ' 1i, N ' 2i, N ' 3i, N ' 4ibe respectively the distributed quantity of the i-th class hole in four pieces of regions; S ' 13i, S ' 24i, S ' 12ibe respectively the i-th class hole in one, three regions, the evaluation number of two, four regions and the distribution of one, two zone aspect angles; S ' iit is the evaluation index of the i-th class hole azimuthal distribution;
On cross section, the distribution index of hole is:
d p=η′×∑k′ i×(r′ i+t′ i+S′ i)
In formula: d pfor asphalt mesoporosity distribution index; η ' is a undetermined coefficient relevant to pore-size; K ' ifor the area ratio of the i-th class hole on cross section, k ' i=a ' i/ a '; A ' ifor the total area of the i-th class hole on cross section; A ' is the total area of hole all kinds of on cross section; R ' ifor the center of gravity of the i-th class hole on cross section and the range deviation rate of geometric center; T ' ibe the distributed number condition parameter of the i-th class hole in four pieces of regions; S ' iit is the evaluation number of the i-th class hole azimuthal distribution;
On cross section, mixture uniformity index d is:
d=d a+d p
Mixture uniformity on this direction is characterized with mixture uniformity in one group of parallel cut; The overall homogeneity of asphalt carries out comprehensive evaluation by compound horizontal direction and vertical direction homogeneity;
Computing formula is as follows:
D=α×d h+β×d v
In formula: D is Homogeneity of Asphalt Mixture index; α, β are respectively horizontal direction and vertical direction mixture uniformity to the weight of overall homogeneity; d h, d vbe respectively asphalt horizontal direction and vertical direction uniformity index;
d h=∑γ h(i-i)×d h(i-i)
d v=∑γ v(i-i)×d v(i-i)
In formula, γ h (i-i), γ v (i-i)be respectively level and vertical direction i-th cross section mixture uniformity to the influence coefficient of overall homogeneity;
D h (i-i), d v (i-i)be respectively level and vertical direction i-th cross section mixture uniformity index;
Homogeneity of Asphalt Mixture index D is less, and corresponding Homogeneity of Asphalt Mixture is better; Otherwise then Homogeneity of Asphalt Mixture is poorer.
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Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104458432B (en) * 2014-11-21 2017-02-01 长安大学 Method for determining granularity area of asphalt mixture and for evaluating influence factors
CN104931515B (en) * 2015-06-01 2017-11-07 大连海事大学 Inner homogeneous recognition methods based on asphalt each component relative density
CN105092451B (en) * 2015-08-13 2017-12-08 大连海事大学 A kind of Air Voids of Asphalt Mixtures Forecasting Methodology
CN105806861A (en) * 2016-04-25 2016-07-27 浙江大学 Visual uniaxial penetrating test-based bituminous mixture homogeneity evaluation method
CN106290144B (en) * 2016-08-17 2019-01-18 河海大学 The method of the board-like test specimen homogenieity of Fast Evaluation asphalt
CN107024411B (en) * 2017-04-20 2019-06-28 长安大学 A kind of Asphalt Pavement Construction Quality uniformity methods of testing and evaluating
CN107121440B (en) * 2017-04-20 2023-03-17 宁波市交通建设工程试验检测中心有限公司 Method for detecting and evaluating aggregate distribution uniformity of asphalt pavement
CN108645735B (en) * 2018-04-02 2020-06-30 三峡大学 Method for evaluating uniformity of asphalt mixture
CN108548781B (en) * 2018-04-17 2021-03-16 郑州磨料磨具磨削研究所有限公司 Grinding wheel mixing uniformity image detection method and device
CN111626529B (en) * 2019-02-27 2023-07-25 长沙理工大学 Method for evaluating RAP dispersion degree in reclaimed asphalt mixture
CN110068575B (en) * 2019-04-29 2022-09-09 嘉兴学院 Judging method and device for multiphase mixing uniformity and terminal
CN113109219B (en) * 2021-04-29 2022-07-01 重庆交通大学 Image analysis-based coarse aggregate gradation monitoring method for asphalt pavement
CN113392570B (en) * 2021-06-08 2022-10-18 哈尔滨工业大学 Method for evaluating homogeneity degree of pore structure of cement-based material particle stacking system
CN113791069B (en) * 2021-07-26 2022-11-04 河海大学 Asphalt mixture uniformity evaluation method based on square area division
CN115048785B (en) * 2022-06-09 2024-03-19 重庆交通大学 Evaluation method for dispersion uniformity of recycled asphalt mixture

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101354241A (en) * 2008-07-11 2009-01-28 长安大学 Method and system for evaluating aggregate digital image
CN101403683A (en) * 2008-11-17 2009-04-08 长安大学 Method for analyzing porous asphalt mixture gap structure by using CT technology

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101354241A (en) * 2008-07-11 2009-01-28 长安大学 Method and system for evaluating aggregate digital image
CN101403683A (en) * 2008-11-17 2009-04-08 长安大学 Method for analyzing porous asphalt mixture gap structure by using CT technology

Non-Patent Citations (12)

* Cited by examiner, † Cited by third party
Title
Assessment of Asphalt Specimen Homogeneity;Richard H. McCuen and Haleh Azari;《J. Transp. Eng.》;20011031;第127卷(第5期);第363-369页 *
Characterization of Asphalt Mixture Homogeneity Based on X-ray Computed Tomography;Chichun Hu等;《Journal of Testing and Evaluation》;20121126;第40卷(第7期);第1-7页 *
New method to quantitatively evaluate the homogeneity of asphaltmixtures;WU Wen-liang等;《Journal of Harbin Institute of Technology》;20090430;第16卷(第4期);第537-540页 *
Towards an Index of Asphalt Mixture Homogeneity;Y. Peng等;《Road Materials and Pavement Design》;20090331;第10卷(第3期);第545-567页 *
基于数字图像处理技术的沥青混合料均匀性评价方法;英红等;《公路》;20070831(第8期);第177-179页 *
室内成型沥青混合料试件水平向均匀性研究;赵永祯等;《华东公路》;20130420(第2期);第92-94页 *
数字图像处理在沥青混合料均匀性评价中的应用;彭勇等;《吉林大学学报(工学版)》;20070331;第37卷(第2期);第334-337页 *
沥青混合料均匀性影响因素的研究;彭勇等;《同济大学学报(自然科学版)》;20060131;第34卷(第1期);第59-63页 *
沥青混合料均匀性评价新方法的探讨;彭勇等;《同济大学学报(自然科学版)》;20050228;第33卷(第2期);第166-168、173页 *
沥青混合料均匀性评价研究;刘丹等;《交通科技》;20070831(第4期);第77-79页 *
用数字图像处理技术评价沥青混合料均匀性;吴文亮等;《吉林大学学报(工学版)》;20090731;第39卷(第4期);第921-925页 *
粗细集料对沥青混合料均匀性影响研究;张军等;《公路》;20130228(第2期);第171-174页 *

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