CN106680158A - Asphalt mixture separation degree estimation method and device - Google Patents
Asphalt mixture separation degree estimation method and device Download PDFInfo
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- CN106680158A CN106680158A CN201710012972.6A CN201710012972A CN106680158A CN 106680158 A CN106680158 A CN 106680158A CN 201710012972 A CN201710012972 A CN 201710012972A CN 106680158 A CN106680158 A CN 106680158A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000010426 asphalt Substances 0.000 title claims abstract description 36
- 239000000203 mixture Substances 0.000 title claims abstract description 23
- 238000000926 separation method Methods 0.000 title abstract 7
- 238000002955 isolation Methods 0.000 claims abstract description 80
- 238000012360 testing method Methods 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000013461 design Methods 0.000 claims abstract description 16
- 238000011156 evaluation Methods 0.000 claims description 19
- 238000005204 segregation Methods 0.000 claims description 15
- 230000003028 elevating effect Effects 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 12
- 238000003556 assay Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims 1
- 238000004364 calculation method Methods 0.000 abstract description 6
- 238000001612 separation test Methods 0.000 abstract 2
- 238000000611 regression analysis Methods 0.000 abstract 1
- 238000004458 analytical method Methods 0.000 description 10
- 238000010998 test method Methods 0.000 description 6
- 241000510032 Ellipsaria lineolata Species 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000000205 computational method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- RSWGJHLUYNHPMX-ONCXSQPRSA-N abietic acid Chemical compound C([C@@H]12)CC(C(C)C)=CC1=CC[C@@H]1[C@]2(C)CCC[C@@]1(C)C(O)=O RSWGJHLUYNHPMX-ONCXSQPRSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000491 multivariate analysis Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0272—Investigating particle size or size distribution with screening; with classification by filtering
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Abstract
The invention provides a coarse aggregate separation degree estimation index, a coarse aggregate separation test device and an asphalt mixture separation degree estimation method. The main point is as follows: 1) the weighted average of coarse aggregate grading deviation of each area of a material pile is used as the separation degree estimation index; 2) the test device comprises a support, wherein a funnel is fixed on the support and used for containing coarse aggregate mixed in proportion, the bottom of the funnel can be closed, and the coarse aggregate falls into a liftable receiving plate through the funnel; multiple concentric isolation barrels with different inner diameters are arranged and penetrate through the declining receiving plate, and the coarse aggregate enters each isolation barrel; 3) the device is used for the coarse aggregate separation test and calculating the coarse aggregate separation degree estimation index; 4) a separation degree index model equation is established through regression analysis; 5) the asphalt mixture separation degree is estimated by use of the model equation and design grading information. The technical principle is clear, the device is simple and convenient to produce, the test and calculation process is simple, and the estimation method is reliable.
Description
Technical field
The invention belongs to asphalt pavement material technical field, and in particular to a kind of coarse aggregate isolation degree evaluation index, thick
Gather materials isolation test device, asphalt mixture segregation degree predictor method.
Background technology
Asphalt mixture segregation refers to the gather materials different coarse aggregate of middle size and fine aggregate phenomenon pockety,
It has a strong impact on the pavement performance of bituminous paving.In consideration of it, having carried out the correlational study of asphalt mixture segregation both at home and abroad.At present
Conventional evaluation methodology to asphalt mixture segregation both at home and abroad mainly has two classes, and a class is that directly asphalt mixture segregation is carried out
Evaluate, mainly including ocular estimate, construction depth method, densimetry in situ, grading analysis method, infiltration test method, thermal infrared imager method,
Image analytical method etc..CN103196813 B authorize a kind of detection method of road deck asphalt mixture segregation degree, this
The bright dependency relation with Wheel Tracking Specimens for Asphalt Mixtures time of penetration and voidage judges isolation degree, and detection method is based on drip
The infiltration test of blue or green compound rut test piece.The test material preparation and process of the test that the method is related to is cumbersome, and is an inter-species
Determination methods are connect, error component is more.CN104251805 A disclose a kind of asphalt mixture gradation method for quick and its
Equipment, the method using asphalt as subjects, with thick ratio index, level with coefficient of stability evaluation gather materials proportioning by optional stage
Quality.Due to the construction workability and isolation degree of test temperature appreciable impact asphalt, and the testing equipment is without phase
The temperature control equipment of pass, therefore result of the test is difficult to control to the accuracy of evaluation index.It is another kind of, it is that directly research collects
The isolation of material, according to the isolation for gathering materials the isolation degree of asphalt is evaluated.CN105259338 A disclose road pellet class
Base material isolates performance valuator device and evaluation methodology, the invention using stockpile pile up diameter and piling height be used for from
Analysis index, it is based on foundation on the basis of isolation degree and stocking angle correlation.But affect the factor of stocking angle
Have a lot, such as fines typically has larger angle of repose, if only with single particle size, now having no isolation and producing, and adopt and be somebody's turn to do
Index can then obtain the result of the isolation degree less than coarse fodder of fines, not as the result for directly being reflected using aggregate grading difference
It is more accurate and visual.In addition, above invention is that isolation is tested after the completion of Asphalt Mixture Design, it is impossible to match somebody with somebody in level
Design phase uses, thus does not have direct directive function to Gradation Optimization design.
The content of the invention
An object of the present disclosure is to provide a kind of coarse aggregate isolation degree evaluation index, the index by simulation coarse aggregate from
Feed bin discharge process produce isolation and obtain.
Second purpose of the invention is to provide and falls and each region coarse aggregate point in stockpile forming process for simulating coarse aggregate
The assay device of cloth situation, degree evaluation index is isolated using the device by testing come analytical calculation coarse aggregate.The device profit
Designed with the granule characteristics of motion, isolation bucket is arranged layer by layer, be easy to carry out feeding to the coarse aggregate of zones of different in stockpile to go forward side by side
Row grading analysis.
3rd purpose of the invention is to provide a kind of method for estimating asphalt mixture segregation degree, and the method is to set up
Isolate on the theoretical basiss of correlation in asphalt mixture segregation and coarse aggregate.
In order to reach above-mentioned purpose, first technical scheme that the present invention is provided：
Based on the know-why of during freely falling body the forms stockpile distributional difference of gathering materials of different-grain diameter, propose a kind of
Coarse aggregate isolates degree evaluation index, and the index is unloaded by the coarse aggregate (particle diameter >=2.36mm) that simulation is mixed in proportion from feed bin
Material process produce isolation and obtain.Stockpile is divided into from the inside to the outside in concentric circles n region, 3≤n≤6 take each
The coarse aggregate in region carries out sieve test, obtains the coarse aggregate grading curve in each region, and the coarse aggregate level for analyzing each region is matched somebody with somebody
Curve matches somebody with somebody the deviation that (i.e. simple to match somebody with somebody) curve is produced with the coarse aggregate level before whereabouts, i.e., wrapped by calculating this two grading curves
The area for enclosing is obtained the isolation degree of each region coarse aggregate.The isolation degree that can obtain each region with the computational methods refers to
Mark Δ SDi(i=1,2 ..., n), then stockpile total mass ratio is accounted for using each region coarse aggregate be weighted averagely as weight
Coarse aggregate isolation level index SD is obtained, result of calculation represents that computing formula is as follows using percent：
In formula：I=1,2 ..., n is regional number, represents n region from inside to outside, 3≤n≤6；kiFor weight, refer to each
Region coarse aggregate quality miAccount for the ratio of gross mass m；ΔSDiFor i regions coarse aggregate grading curve and former grading curve institute enveloping surface
Product；J to gather materials sieve series number, will sieve diameter be respectively 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm,
The collection material screen of 26.5mm, 31.5mm is designated as successively from small to large 1,2,3,4,5,6,7, No. 8 sieves；cjThen represent each sequence number sieve institute right
The sieve diameter answered；The respectively actual grating curve of i regions coarse aggregate is logical at j sieve apertures with former grading curve
Cross rate.
The present invention provide alternative plan be：
For analyzing the assay device that coarse aggregate isolates degree size, including：
Support, fixed funnel on support, funnel is used to hold according to coarse aggregate of the level with ratio mixing, and the bottom of funnel can
Closing is arranged, and coarse aggregate drops into receiver by funnel, and receiver liftable is located at the lower section of funnel, and receiver and funnel
Interval setpoint distance is arranged；
The different isolation bucket of internal diameter that several are arranged concentrically, isolation bucket rises and through receiver when receiver declines,
Fall within the coarse aggregate on receiver to enter in isolation bucket.
To simplify structure, support can be two montants, and funnel is horizontally disposed and is fixed on the upper of support by funnel stand
Portion, the both sides of funnel stand are arranged through two montants, and the both sides of funnel stand are respectively by fixed knob fixed support and funnel
Frame.
For the ease of being analyzed to coarse aggregate isolation degree, the bottom of the funnel sets higher than support plate 110-130cm
Put.
In order to keep the shape of coarse aggregate stockpile on receiver, prevent coarse aggregate granule from losing, arrange on receiver
The splicing gear bucket of annular.
Described receiver be provided with some circles for communicating up and down and one enclose for fix splicing gear chimb, receiver bottom
Portion arranges cross reinforcing bar to fix receiver, and the side wall of the isolation bucket described in each is divided into four sections and passes through in order to cross reinforcing bar,
The size of circle matches with the size for isolating bucket.
The isolation bucket includes described side wall and is fixed on the support plate of the frame bottom, and support plate upper surface is arranged
For the groove of fixed sidewall, to facilitate the later stage to isolating the dismounting of barrel side wall, in order to take out rough set from a certain isolation bucket
Material.
It is that stockpile is divided into into n region, the isolation bucket arranges altogether n-1 layers, and its internal diameter size is followed successively by from the inside to the outside d
Cm, 2d cm ..., (n-1) d cm, it is nd cm to take splicing gear bucket internal diameter size, wherein, 3≤n≤6,10≤d≤20,45≤nd
≤80。
The circumference of the support plate is arranged beyond described support.
The receiver is provided with perforate, and the support is arranged through perforate, between the support plate and the receiver
Elevating mechanism is set, and receiver is at extreme higher position, and the extreme higher position for isolating bucket is concordant with the upper surface of receiver.
Further, the elevating mechanism is located at the outer ring of the support.
The test method for obtaining coarse aggregate isolation level index using the assay device is as follows：
1) will fall as the movement of falling object from setting height according to coarse aggregate of the level with ratio mixing, the shape in receiver
Into stockpile；
2) receiver is moved down under the drive of elevating mechanism, and the isolation bucket that several are arranged concentrically is through on receiver
Move, the coarse aggregate on receiver is dropped in isolation bucket；
3) from outside to inside successively to isolate bucket in coarse aggregate carry out feeding screening, obtain each isolation bucket in coarse aggregate
Grading curve；
4) it is worth to isolate level index SD by calculating weighted average of each region coarse aggregate level with deviation value；
5) repeat step 1)-step 4) at least 3 times, the meansigma methodss for obtaining are used as final result of the test.
The present invention provide third program be：
A kind of method for estimating asphalt mixture segregation degree size, the method is with asphalt mixture segregation and rough set
Material isolation correlation is theoretical basiss, using uniform mixing design method design experiment scheme, is provided by the present invention
Isolation evaluation index, assay device and test method determine the isolation level index of each group coarse aggregate in testing program, by each group
Result of the test carries out regression analyses and obtains forecast model, comprises the following steps that：
1) determined using gear number a of coarse aggregate (particle diameter >=2.36mm) (such as AC- according to asphalt nominal maximum particle diameter
16 grades of timing a=5), the ratio of gross mass is accounted for as independent variable with each shelves coarse aggregate, isolation level index SD is dependent variable, is adopted
Uniform mixing design method carries out EXPERIMENTAL DESIGN, formulates testing program.Because the ratio sum that each shelves coarse aggregate accounts for gross mass is
100%, therefore test factor number is a-1, the group number of testing program is (a-1)2。
2) according to above-mentioned testing program, the coarse aggregate provided by the present invention isolates evaluation index, assay device and test
Method determines the isolation level index of each group coarse aggregate in testing program.
3) according to above-mentioned result of the test, set up with each shelves coarse aggregate by statistical software and account for total mass ratio as independent variable, from
Analysis level index is the regression model equation of dependent variable, and the equation and regression coefficient to obtaining carries out significance test.
If 4) above-mentioned significance test meets the requirements, the regression equation set up is effective, can be mixed as Colophonium is estimated
Close the formula of material isolation degree size；If undesirable, repeat step 1)-step 3) until inspection meets requirement.
5) when asphalt mixture gradation is designed, the coarse aggregate ratio that different designs level is matched somebody with somebody substitutes into above-mentioned model equation
Estimate their isolation degree size, such that it is able to seek that isolation degree is less and also void in mineral aggregate again compliant is required
Level provides theoretical foundation with feasible method with matching somebody with somebody as design level for Gradation Optimization design.
The present invention has advantages below：
1) know-why clear and definite of the invention, evaluation index implication understands, calculates relatively easy.
2) overall structure of assay device of the present invention is simple, by elevating mechanism, receiver and isolates the setting of bucket, is easy to
The stockpile regional that gathers materials is gathered materials and is collected, comparatively fast obtain the isolation situation that each region gathers materials, and then determine isolation degree
Index.
3) subjects of the invention are coarse aggregate rather than asphalt, and method is simple to operate, lead to too small amount of test
Isolation degree prediction model equation can be set up with calculating, can be used for the isolation journey that the gradation design stage estimates asphalt
Degree, theoretical foundation is provided with feasible method for Gradation Optimization design.
Description of the drawings
Fig. 1 is that coarse aggregate isolates degree evaluation device overall schematic；
Fig. 2 is isolation bucket isolation stockpile schematic diagram；
Fig. 3 is the funnel stand structural representation for connecting funnel and support；
Fig. 4 is the structure chart of receiver；
Fig. 5 is several isolation barrel structure schematic diagrams being fixed on by groove in support plate；
In figure：1- funnels；2- butterflys；3- funnel stands；4- fixed knobs；5- supports；6- elevating mechanisms；7- splicings keep off
Bucket；8- receivers；9- support plates；10- isolates bucket.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, retouching for system is carried out to the technical scheme in the embodiment of the present invention
State.
For analyzing the assay device that coarse aggregate isolates degree size, as depicted in figs. 1 and 2, including：
Support, fixed funnel 1 on support, funnel is used to hold according to coarse aggregate of the level with ratio mixing, the bottom of funnel
Setting can be closed, the bottom of funnel 1 arranges butterfly 2, when needing to hold coarse aggregate, the bottom of the closing funnel of butterfly 2
Portion, after opening butterfly 2, coarse aggregate drops into receiver 8 by funnel 1, and receiver liftable is located at the lower section of funnel 1,
The bottom of the funnel is arranged higher than the 110cm of support plate 9, and receiver is arranged with Infundibulum septum setpoint distance.
The different isolation bucket 10 of three internal diameters being arranged concentrically, its internal diameter size be followed successively by from the inside to the outside 18cm, 36cm,
54cm.Isolation bucket 10 rises and through receiver 8 when receiver 8 declines, and falls within the coarse aggregate on receiver 8 and enters into isolation bucket
In 10.
To simplify structure, support 5 can be two montants, and funnel 1 is horizontally disposed and is fixed on support 5 by funnel stand 3
Top, the both sides of funnel stand 3 are arranged through two montants, and the both sides of funnel stand 3 pass through respectively the fixed support of fixed knob 4
With funnel stand, the height adjustable of funnel is achieved in that.
The splicing gear bucket 7 of annular is set on receiver 8, and internal diameter size is 72cm.
Described receiver 8 is provided with about three circles for communicating, and passes through for isolating bucket 10；The circle of outermost one is groove,
For fix splicing gear bucket 7, as shown in figure 4, the bottom of receiver 8 arrange cross reinforcing bar to fix receiver, described in each every
It is divided into four sections from the side wall of bucket 10 to pass through in order to cross reinforcing bar, the size of circle matches with the size for isolating bucket 10.
The isolation bucket 10 includes described side wall and is fixed on the support plate 9 of the frame bottom, as shown in figure 5, propping up
The upper surface of support plate 9 is provided for the groove of fixed sidewall, to facilitate the later stage to isolating the dismounting of the side wall of bucket 10, to facilitate to a certain
The taking-up gathered materials in isolation bucket 10.
The circumference of the support plate 9 is arranged beyond described support 5；The receiver 8 is provided with perforate, and the support 5 is worn
Perforate setting is crossed, elevating mechanism 6 is set between the support plate 9 and the receiver 8, the elevating mechanism 6 is located at described
The outer ring of support 5, elevating mechanism can be electric lift, receiver 9 at extreme higher position, isolate the extreme higher position of bucket 10 with
The upper surface of receiver is concordant.
Because grain diameter is of different sizes, its move distance during freely falling body forms stockpile can be different,
The bigger granule move distance of particle diameter is more remote, and the level which results in stockpile each region from the inside to the outside changes with situation, from
And produce isolation.On this basis, stockpile is divided into from the inside to the outside in concentric circles four regions, analyzes the thick of each region
The deviation that aggregate grading curve is produced with former grading curve, i.e., the area for being surrounded by calculating this two grading curves can be obtained
To the isolation situation of each region coarse aggregate.The isolation index Δ S in four regions can be obtained using the computational methodsi(i=1,2,3,
4), then account for the final isolation degree of acquisition by stockpile total mass ratio is weighted averagely as weight using each region coarse aggregate to refer to
Mark SD, result of calculation represents that specific formula for calculation is as follows using percent：
In formula：I=1,2,3,4 is regional number, represents 4 regions from inside to outside；kiFor weight, refer to each region coarse aggregate
Quality accounts for the ratio of gross mass；ΔSDiArea is surrounded by i regions coarse aggregate grading curve with former grading curve；J is collection material screen
Sequence number, will sieve diameter be respectively the collection of 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm
Material screen is designated as successively from small to large 1,2,3,4,5,6,7, No. 8 sieves；cjThen represent the corresponding sieve diameter of each sequence number sieve；Respectively percent of pass of the actual grating curve of i regions coarse aggregate with former grading curve at j sieve apertures.
Using above-mentioned device, specific test method is as follows：
1) each shelves coarse aggregate is carried out into dispensing according to level with ratio, quality of materialsing be 10-15kg and more than；
2) coarse aggregate is sufficiently mixed uniformly by the way of repeatedly overturning agitation, be then divided to two by the coarse aggregate for mixing
It is secondary to be fitted in funnel 1；
3) funnel stand 3 is fixed on into support 5 at support plate 110-130cm；
4) fully charged funnel 1 is placed on support 5 and ensures funnel 1 in horizontality, rotatable hopper mouth baffle plate 2,
Coarse aggregate is set freely to fall and form stockpile on receiver 8；
5) receiver 8 is slowly fallen along support by elevating mechanism 6, stockpile is isolated into when by isolating bucket 10
Four parts；
6) successively removing isolation barrel side wall feeding from outside to inside carries out sieve test, and the level for obtaining each region coarse aggregate is matched somebody with somebody
Curve；
7) isolation level index SD, the above-mentioned test of repetition at least three times, the meansigma methodss work for obtaining are calculated using formula
To test the final result for obtaining.
Each shelves coarse aggregate quality accounts for the ratio of gross mass as independent variable in being matched somebody with somebody with level, and isolation level index SD is dependent variable,
Regression analyses are carried out to test data using secondary nonlinear multivariable equation, wherein the number of independent variable is with asphalt nominal
Maximum particle diameter is relevant.By taking AC-16 as an example, coarse aggregate has 2.36-4.75mm, 4.75-9.5mm, 9.5-13.2mm, 13.2-
Five grades of 16mm, 16-19mm, therefore 5 dependent variable are had, it is set to X1、X2、X3、X4With X5, respectively each shelves coarse aggregate accounts for gross mass
Ratio.Testing program is determined using uniform mixing design legal system, by above-mentioned test procedure and the isolation degree for being calculated each group
Index S D, the results are shown in Table 1.
The AC-16 each group coarse aggregate ratios of table 1 and isolation test result
Using the result of the test of table 1, multivariate statistics are set up using softwares such as Matlab, SPSS, DPS, Mathematica and is returned
Return model, obtain regression equation as follows：
SD (x)=6.57807+0.23754x2+0.36526x5-0.0033792x2 2-0.0020741x3 2-
0.00161631x4 2
-0.00624091x5 2-0.00524766x2x3-0.00172642x2x4-0.00460765x2x5+
0.00310281x3x4
+0.00126779x3x5-0.00528102x4x5
To check the reliability of regression model equation, F inspections are carried out to the equation under level of significance α, if F >=Fα
(m, n-m-1), then regression model equation be under given level of significance α it is significant, it is otherwise not notable；Meanwhile, inspection of still needing
The significance of regression coefficient is tested, if Fi≥Fα(1, n-m-1), then it is significantly, otherwise not notable.In the model equation, significance water
Flat to take α=0.05, independent variable number m=12, observation group number n=16, Jing looks into F-distribution table and obtains：Fα(m, n-m-1)=F0.05(12,
3)=8.74, Fα(1, n-m-1)=F0.05(1,3)=10.13.The F values for calculating regression equation by statistical software are 556.20,
More than 8.74；The F of each coefficient significance testiValue is shown in Table 2, is all higher than 10.13.Therefore, regression equation and regression coefficient are aobvious
Under horizontal α=0.05 of work property significantly, illustrate that equation is effective under the significance level.
The model significance test result of table 2
| Coefficient entry | The significance test F of coefficientiValue |
| X2 | 50.11 |
| X5 | 247.3 |
| X2 2 | 87.13 |
| X3 2 | 253.45 |
| X4 2 | 285.24 |
| X5 2 | 320.06 |
| X2X3 | 65.11 |
| X2X4 | 60.9 |
| X2X5 | 132.1 |
| X3X4 | 78.2 |
| X3X5 | 19.73 |
| X4X5 | 944.44 |
It is simultaneously the precision of prediction for guaranteeing regression model, model prediction result and actual tests result is carried out to score
Analysis, as a result as shown in table 3, the meansigma methodss of relative error are 0.8%.
The model prediction accuracy analysis result of table 3
Analyzed by regression model coefficient significance test and model prediction accuracy, the regression model equation meets the requirements,
It is reliable.
To illustrate the application and checking of regression model equation, in JTG F40-2004《Asphalt highway construction technology is advised
Model》The engineering grade of regulation chooses three grading curves in the range of matching somebody with somebody, and the ratio of each shelves coarse aggregate is shown in Table 4, is tested by above-mentioned
To isolation level index SD (actual measurement) list table 4 in, while 3 groups of ratios are substituted into the model equation set up above be obtained from
Analysis level index predictive value SD ' (prediction), also lists table 4 in.From the SD (actual measurement) in table 4 and value SD ' (prediction), although in advance
There is certain deviation in measured value, but its size sequence is consistent, is the group ＜ groups 2 of 1 ＜ groups 3, illustrates level with 1 with measured value
Isolation degree is minimum.Therefore, it can according to coarse aggregate isolation test set up model equation come the isolation of anticipation asphalt
Degree.
Test value and predictive value of 4 three levels of table with coarse aggregate proportioning with isolation degree
The not yet systematic asphalt mixture segregation appraisement system of current China, and existing some isolation evaluation indexes are then
The asphalt to mixing or bitumen mixture specimen is needed to be tested and evaluated mostly.Relative to it is this have to pass through it is numerous
Trivial test can just obtain the way of isolation degree size sequence, and method proposed by the present invention has obvious technical advantage, and one is
Know-why clear and definite, evaluation index implication understands, calculates relatively easy；Two is that assay device comparison is easy, test
Process simple possible, tested number and amount of calculation it is fewer；Three be the gradation design stage can anticipation asphalt isolation
Degree, theoretical foundation is provided with feasible method for Gradation Optimization design.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
Various modifications to embodiment will be apparent for those skilled in the art, as defined herein general
Principle can in other embodiments be realized without departing from the spirit or scope of the present invention, is not described in detail
The part presented with partial enlargement, is prior art, and here is not repeated.Therefore, the present invention is not intended to be limited to herein
These shown embodiments, and it is to fit to the most wide scope consistent with principles disclosed herein and feature.
Claims (10)
1. a kind of coarse aggregate isolates degree evaluation index, it is characterised in that the coarse aggregate being mixed in proportion is carried out into freely falling body
Stockpile is formed, by stockpile from the center to n region is divided into outward, adding for deviation is matched somebody with somebody in 3≤n≤6 by each region coarse aggregate level of stockpile
Weight average is worth a kind of coarse aggregate isolation degree evaluation index S D, and its middle rank is with deviation value by each region coarse aggregate grading curve
Surround area to represent with former grading curve.
2. a kind of rough set as claimed in claim 1 isolates degree evaluation index, it is characterised in that isolation degree evaluation index S D
Calculated according to equation below：
In formula：I=1,2 ..., n is regional number, represents n region from inside to outside, 3≤n≤6；kiFor weight, refer to each region
Coarse aggregate quality accounts for the ratio of gross mass；ΔSDiArea is surrounded by i regions coarse aggregate grading curve with former grading curve；J is
Gather materials sieve series number, will sieve diameter be respectively 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm,
The collection material screen of 31.5mm is designated as successively from small to large 1,2,3,4,5,6,7, No. 8 sieves；cjThen represent the corresponding sieve of each sequence number sieve
Bore dia；Respectively percent of pass of the actual grating curve of i regions coarse aggregate with former grading curve at j sieve apertures.
3. a kind of coarse aggregate as any one of claim 1-2 isolates the acquisition methods of degree evaluation index, its feature
It is to comprise the following steps that：
1) will fall from setting height according to coarse aggregate of the level with ratio mixing, stockpile is formed in receiver；
2) receiver is moved down under the drive of elevating mechanism, and the isolation bucket that several are arranged concentrically is moved through on receiver,
Coarse aggregate on receiver is dropped in isolation bucket；
3) from outside to inside successively to isolate bucket in coarse aggregate carry out feeding screening, obtain each isolation bucket in coarse aggregate level
Match somebody with somebody；
4) it is worth to isolate level index SD with the weighted average for deviateing by each region coarse aggregate level；
5) repeat step 1)-step 4) at least 3 times, meansigma methodss are obtained as result of the test.
4. it is used to analyze the assay device that coarse aggregate isolates degree size, it is characterised in that include：
Support, fixed funnel on support, funnel is used to hold according to coarse aggregate of the level with ratio mixing, and the bottom of funnel can be closed
Arrange, coarse aggregate drops into receiver by funnel, receiver liftable is located at the lower section of funnel, and receiver and Infundibulum septum
Setpoint distance is arranged；
The different isolation bucket of internal diameter that several are arranged concentrically, isolation bucket rises and through receiver when receiver declines, and falls within
Coarse aggregate on receiver is entered in isolation bucket.
5. it is as claimed in claim 4 to be used to analyze the device that coarse aggregate isolates degree size, it is characterised in that the funnel
Bottom is arranged higher than support plate 110-130cm.
6. it is as claimed in claim 4 to be used to analyze the device that coarse aggregate isolates degree size, it is characterised in that on receiver
The splicing gear bucket of annular is set.
7. it is as claimed in claim for analyzing the device that coarse aggregate isolates degree size, it is characterised in that described splicing
Disk is provided with some circles for communicating up and down and one encloses for fixing splicing gear chimb, and splicing tray bottom arranges cross reinforcing bar with solid
Determine receiver, the side wall of the isolation bucket described in each is divided into four sections and passes through in order to cross reinforcing bar.
8. it is as claimed in claim 4 to be used to analyze the device that coarse aggregate isolates degree size, it is characterised in that the isolation bucket
Including described side wall and the support plate for being fixed on the frame bottom, support plate upper surface is provided for the recessed of fixed sidewall
Groove；
Further, the circumference of the support plate is arranged beyond described support；
Further, the receiver is provided with perforate, and the support is arranged through perforate, in the support plate and the receiver
Between elevating mechanism is set；
Further, the elevating mechanism is located at the outer ring of the support.
9. it is a kind of for analyze estimate asphalt mixture segregation degree size method, it is characterised in that comprise the following steps that：
1) for different asphalt nominal maximum particle diameters, the group number of testing program is determined using uniform mixing design method,
By the method described in claim 3, the isolation level index SD of each group is obtained；
2) to step 1) data that obtained set up multivariate statistical regression model equation, and the equation and regression coefficient to obtaining enters
Row significance test；
If 3) inspection meet the requirements, regression equation be it is effective, can be used as the public affairs for estimating asphalt mixture segregation degree size
Formula；If inspection is undesirable, repeat step 1)-step 2) until inspection is qualified.
10. a kind of method for estimating asphalt mixture segregation degree size as claimed in claim 9, it is characterised in that
In the step 2) in using the software such as Matlab, SPSS, DPS, Mathematica to step 1) data that obtained set up many
First statistical regression model.
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| CN109759316A (en) * | 2019-01-31 | 2019-05-17 | 中南大学 | A kind of pulp classifier and method for sieving detecting granular materials gradation characteristic reliability |
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| CN113049792A (en) * | 2021-03-18 | 2021-06-29 | 广西交科集团有限公司 | Indoor simulation device for segregation degree of asphalt mixture and using method thereof |
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| CN107480463B (en) * | 2017-09-07 | 2020-02-04 | 中国建筑土木建设有限公司 | Method for calculating segregation degree of bubbles in cement concrete structure |
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| CN109759316A (en) * | 2019-01-31 | 2019-05-17 | 中南大学 | A kind of pulp classifier and method for sieving detecting granular materials gradation characteristic reliability |
| CN109759316B (en) * | 2019-01-31 | 2022-03-18 | 中南大学 | Screening instrument and screening method for detecting grading characteristic reliability of granular material |
| CN112082857B (en) * | 2020-07-27 | 2021-12-07 | 河海大学 | Evaluation index and test method for compression resistance of glass beads for roads |
| CN112082857A (en) * | 2020-07-27 | 2020-12-15 | 河海大学 | Evaluation index and test method for compression resistance of glass beads for roads |
| CN113049792A (en) * | 2021-03-18 | 2021-06-29 | 广西交科集团有限公司 | Indoor simulation device for segregation degree of asphalt mixture and using method thereof |
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| CN114067931B (en) * | 2021-10-20 | 2024-08-16 | 长安大学 | Asphalt mixture aggregate segregation pre-judging method |
| CN114486609A (en) * | 2021-12-21 | 2022-05-13 | 中交一公局集团有限公司 | Detection method for segregation degree of asphalt mixture |
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| CN115754247A (en) * | 2022-12-10 | 2023-03-07 | 蚌埠中光电科技有限公司 | Quartz sand looseness detection method and evaluation device |
| CN115754247B (en) * | 2022-12-10 | 2024-08-13 | 蚌埠中光电科技有限公司 | Quartz sand looseness detection method and evaluation device |
| CN117218126A (en) * | 2023-11-09 | 2023-12-12 | 安徽省交通规划设计研究总院股份有限公司 | Asphalt mixture uniformity calculation method in image processing vision field |
| CN117218126B (en) * | 2023-11-09 | 2024-02-13 | 安徽省交通规划设计研究总院股份有限公司 | Asphalt mixture uniformity calculation method in image processing vision field |
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