CN106680158B - A kind of asphalt mixture segregation degree predictor method and device - Google Patents
A kind of asphalt mixture segregation degree predictor method and device Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000000203 mixture Substances 0.000 title claims abstract description 24
- 238000005204 segregation Methods 0.000 title claims abstract description 17
- 238000002955 isolation Methods 0.000 claims abstract description 107
- 238000012360 testing method Methods 0.000 claims abstract description 35
- 238000011156 evaluation Methods 0.000 claims abstract description 26
- 238000013461 design Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 43
- 230000003028 elevating effect Effects 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 11
- 230000001419 dependent effect Effects 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 6
- 238000005457 optimization Methods 0.000 claims description 5
- 238000013401 experimental design Methods 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 239000011800 void material Substances 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000000611 regression analysis Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000004458 analytical method Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 5
- 241000510032 Ellipsaria lineolata Species 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000205 computational method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011065 in-situ storage Methods 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
- 238000012856 packing 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
- 238000012795 verification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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 present invention provides a kind of coarse aggregate isolation degree evaluation index, coarse aggregate isolation test device, asphalt mixture segregation degree predictor method, main contents：1) propose to expect that the weighted average that each region coarse aggregate grading of heap deviates is used as isolation degree evaluation index.2) experimental rig includes stent, fixed funnel on stent, and funnel is used to hold the coarse aggregate proportionally mixed, and funnel bottom can close setting, and coarse aggregate is dropped into liftable receiver by funnel；The concentric isolation bucket that several internal diameters are different is set, and through the receiver declined, coarse aggregate enters in each isolation bucket isolation bucket.3) coarse aggregate isolation test is carried out using device, coarse aggregate isolation level index is calculated.4) isolation level index model equation is established by regression analysis.5) using model equation and design level asphalt mixture segregation degree is estimated with information.The technology of the present invention definite principle, device is simple for production, and experiment and calculating process are simple, and predictor 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 particle size and fine aggregate phenomenon pockety,
It seriously affects the pavement performance of bituminous paving.In consideration of it, the correlative study of asphalt mixture segregation is carried out both at home and abroad.At present
Mainly there are two classes to the common evaluation method of asphalt mixture segregation both at home and abroad, one kind is that directly asphalt mixture segregation is carried out
Evaluation, 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, the hair
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 mixture rut test piece.The test material preparation and experiment process that this method is related to are cumbersome, and are an inter-species
Determination methods are connect, error component is more.CN104251805 A disclose a kind of asphalt mixture gradation quick determination method and its
Equipment, for this method using asphalt as subjects, optional stage evaluates proportioning of gathering materials with thick ratio index, the grading coefficient of stability
Quality.Since test temperature significantly affects the construction workability and isolation degree of asphalt, and the testing equipment is without phase
The temperature control equipment of pass, therefore the accuracy of result of the test and evaluation index is difficult to control.It is another kind of, it is direct research collection
The isolation of material, according to the isolation degree of the isolation evaluation asphalt to gather materials.CN105259338 A disclose road pellet class
Base material isolates performance valuator device and evaluation method, the invention using material heap accumulation the ratio between diameter and piling height be used as from
Index is analysed, it is based on isolation degree with being established on the basis of stocking angle correlation.But influence the factor of stocking angle
Have very much, for example fines generally has larger angle of repose, if only with single particle size, has no isolation at this time and produces, and use and be somebody's turn to do
Index can then obtain fines isolation degree be less than coarse fodder as a result, not as the result directly reflected using aggregate grading difference
It is more accurate and visual.In addition, above invention is to test after the completion of Asphalt Mixture Design to isolation, can not be in grading
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 simulate coarse aggregate from
Feed bin discharge process produce isolation and obtain.
Second purpose of the invention is to provide to fall and each region coarse aggregate point in material heap forming process for simulating coarse aggregate
The experimental rig of cloth situation, coarse aggregate isolation degree evaluation index is calculated using the device by testing to analyze.Device profit
Designed with the particle characteristics of motion, isolation bucket is set layer by layer, is gone forward side by side easy to carry out feeding to the coarse aggregate of different zones in material heap
Row grading analysis.
3rd purpose of the invention is to provide a kind of method for estimating asphalt mixture segregation degree, and this method is to establish
On asphalt mixture segregation and the theoretical foundation of coarse aggregate isolation correlation.
In order to achieve the above objectives, first technical solution provided by the invention：
The technical principle of during freely falling body the forms material heap distributional difference of gathering materials based on different-grain diameter, proposes a kind of
Coarse aggregate isolates degree evaluation index, which is unloaded by simulating the coarse aggregate (particle diameter >=2.36mm) mixed in proportion from feed bin
Material process produce isolation and obtain.Material heap is divided into n region from the inside to the outside in concentric circles, 3≤n≤6, take each
The coarse aggregate in region carries out sieve test, obtains the coarse aggregate grading curve in each region, analyzes the coarse aggregate grading in each region
The deviation that curve is produced with coarse aggregate grading (i.e. simple to match somebody with somebody) curve before whereabouts, i.e., wrapped by calculating this two grading curves
The area enclosed can obtain the isolation degree of each region coarse aggregate.The isolation degree that each region can be obtained with the computational methods refers to
Mark Δ SDi(i=1,2 ..., n), then material heap total mass ratio accounted for using each region coarse aggregate be weighted as weight and is averaged
Coarse aggregate isolation level index SD is obtained, result of calculation represents that calculation formula is as follows using percentage：
In formula：I=1,2 ..., n are regional number, represent 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, i.e., by sieve diameter be respectively 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm,
The collection material screen of 26.5mm, 31.5mm are denoted as 1,2,3,4,5,6,7, No. 8 sieve successively from small to large；cjIt is right then to represent each sequence number sieve institute
The sieve diameter answered；The respectively actual grating curve of i regions coarse aggregate and former grading curve is logical at j sieve apertures
Cross rate.
Alternative plan provided by the invention is：
For analyzing the experimental rig of coarse aggregate isolation degree size, including：
Stent, fixed funnel on stent, funnel are used to hold the coarse aggregate mixed according to grading ratio, and the bottom of funnel can
Closing is set, and coarse aggregate drops into receiver by funnel, and receiver liftable is arranged on the lower section of funnel, and receiver and funnel
Setpoint distance is spaced to set；
The different isolation bucket of several internal diameters for being arranged concentrically, isolation bucket rises and passes through receiver when receiver declines,
The coarse aggregate on receiver is fallen within to enter in isolation bucket.
To simplify structure, stent can be two montants, and funnel is horizontally disposed with and is fixed on the upper of stent by funnel stand
Portion, the both sides of funnel stand are set through two montants, and the both sides of funnel stand pass through fixed knob fixing bracket and funnel respectively
Frame.
For the ease of analyzing coarse aggregate isolation degree, the bottom of the funnel is set higher than support plate 110-130cm
Put.
In order to keep coarse aggregate in the shape of receiver feeding heap, prevent coarse aggregate particle from losing, set on receiver
The splicing gear bucket of annular.
The receiver is provided with some circles communicated up and down and a circle is used to fix splicing gear chimb, receiver bottom
Portion sets cross reinforcing bar to fix receiver, the side wall of the isolation bucket be divided into four sections in order to cross reinforcing bar by,
The size of circle matches with isolating the size of bucket.
The isolation bucket includes the side wall and is fixed on the support plate of the frame bottom, and support plate upper surface is set
For the groove of fixed sidewall, to facilitate dismounting of the later stage to isolation barrel side wall, in order to take out rough set out of a certain isolation bucket
Material.
For material heap is divided into n region, the isolation bucket sets n-1 layers altogether, its internal diameter size is followed successively by d from the inside to the outside
Cm, 2d cm ..., (n-1) d cm, take splicing gear bucket internal diameter size be nd cm, wherein, 3≤n≤6,10≤d≤20,45≤nd
≤80。
The circumference of the support plate is set beyond the stent.
The receiver is equipped with perforate, and the stent is set through perforate, between the support plate and the receiver
Elevating mechanism is set, and for receiver at extreme higher position, the extreme higher position for isolating bucket is concordant with the upper surface of receiver.
Further, the elevating mechanism is arranged on the outer ring of the stent.
The test method that coarse aggregate isolation level index is obtained using the experimental rig is as follows：
1) will be fallen according to the coarse aggregate that grading ratio mixes from setting height as the movement of falling object, the shape in receiver
Into material heap；
2) receiver moves down under the drive of elevating mechanism, several isolation buckets being arranged concentrically are passed through on receiver
Move, the coarse aggregate on receiver is dropped into isolation bucket；
3) feeding screening successively is carried out to the coarse aggregate in isolation bucket from outside to inside, obtains the coarse aggregate in each isolation bucket
Grading curve；
4) it is worth to isolation level index SD by calculating the weighted average of each region coarse aggregate grading deviation value；
5) repeat step 1)-step 4) at least 3 times, obtained average value is as final result of the test.
Third program provided by the invention is：
A kind of method for estimating asphalt mixture segregation degree size, this method is with asphalt mixture segregation and rough set
Material isolation correlation is theoretical foundation, using uniform mixing design method design experiment scheme, by provided by the invention
Isolation evaluation index, experimental rig 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 analysis and obtains prediction model, comprises the following steps that：
1) gear number a (such as AC- using coarse aggregate (particle diameter >=2.36mm) are determined according to asphalt nominal maximum particle diameter
16 grades of timing a=5), the ratio of gross mass is accounted for as independent variable using each shelves coarse aggregate, isolation level index SD be dependent variable, use
Uniform mixing design method carries out experimental design, formulates testing program.It is since each shelves coarse aggregate accounts for the sum of ratio of gross mass
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, evaluation index, experimental rig and experiment are isolated by coarse aggregate provided by the invention
Method determines the isolation level index of each group coarse aggregate in testing program.
3) according to above-mentioned result of the test, established by statistical software and total mass ratio is accounted for as independent variable using each shelves coarse aggregate, from
The regression model equation that level index is dependent variable is analysed, and the equation to obtaining carries out significance test with regression coefficient.
If 4) above-mentioned significance test meets the requirements, the regression equation established is effective, can be mixed as pitch is estimated
Close the formula of material isolation degree size；If undesirable, repeat step 1)-step 3) meets the requirements until examining.
5) when asphalt mixture gradation designs, the coarse aggregate ratio of different designs grading is substituted into above-mentioned model equation
Their isolation degree size is estimated, isolation degree is smaller and void in mineral aggregate meets code requirement again so as to seek
Grading is matched somebody with somebody as design level, and theoretical foundation and feasible method are provided for Gradation Optimization design.
The present invention has the following advantages：
1) technical principle clear and definite of the invention, evaluation index implication understand, calculate relatively easy.
2) overall structure of experimental rig of the present invention is simple, by the setting of elevating mechanism, receiver with isolating bucket, is easy to
Gather materials the material heap regional that gathers materials and be 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 easy to operate, lead to too small amount of experiment
Isolation degree prediction model equation can be established with calculating, the isolation journey of asphalt is estimated available for the gradation design stage
Degree, theoretical foundation and feasible method are provided for Gradation Optimization design.
Brief description of the drawings
Fig. 1 isolates degree evaluation device overall schematic for coarse aggregate；
Fig. 2 is isolation bucket packing material heap schematic diagram；
Fig. 3 is the funnel stand structure diagram of connection funnel and stent；
Fig. 4 is the structure chart of receiver；
Fig. 5 is several isolation barrel structure schematic diagrames being fixed on by groove in support plate；
In figure：1- funnels；2- butterflys；3- funnel stands；4- fixed knobs；5- stents；6- elevating mechanisms；7- splicings are kept off
Bucket；8- receivers；9- support plates；10- isolates bucket.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, retouching for system is carried out to the technical solution in the embodiment of the present invention
State.
For analyzing the experimental rig of coarse aggregate isolation degree size, as depicted in figs. 1 and 2, including：
Stent, fixed funnel 1 on stent, funnel are used to hold the coarse aggregate mixed according to grading ratio, the bottom of funnel
Setting can be closed, the bottom of funnel 1 sets butterfly 2, when needing to hold coarse aggregate, the bottom of 2 closing funnel of butterfly
Portion, after opening butterfly 2, coarse aggregate drops into receiver 8 by funnel 1, and receiver liftable is arranged on the lower section of funnel 1,
The bottom of the funnel is set higher than 9 110cm of support plate, and receiver is set 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 passes through receiver 8 when receiver 8 declines, and falls within the coarse aggregate on receiver 8 and enters isolation bucket
In 10.
To simplify structure, stent 5 can be two montants, and funnel 1 is horizontally disposed and is fixed on stent 5 by funnel stand 3
Top, the both sides of funnel stand 3 are set through two montants, and the both sides of funnel stand 3 pass through 4 fixing bracket of fixed knob respectively
With funnel stand, it is achieved in that the height of funnel is adjustable.
The splicing gear bucket 7 of annular is set on receiver 8, and internal diameter size is 72cm.
The receiver 8 is provided with about three circles communicated, passes through for isolating bucket 10；The circle of outermost one is groove,
For fixing splicing gear bucket 7, as shown in figure 4,8 bottom of receiver sets cross reinforcing bar to fix receiver, it is each described every
Side wall from bucket 10 is divided into four sections in order to which cross reinforcing bar is by the way that the size of circle matches with isolating the size of bucket 10.
The isolation bucket 10 includes the side wall and is fixed on the support plate 9 of the frame bottom, as shown in figure 5, branch
9 upper surface of support plate sets the groove for fixed sidewall, to facilitate dismounting of the later stage to isolation 10 side wall of bucket, to facilitate to a certain
The taking-up gathered materials in isolation bucket 10.
The circumference of the support plate 9 is set beyond the stent 5；The receiver 8 is equipped with perforate, and the stent 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 arranged on described
The outer ring of stent 5, elevating mechanism can be electric lifts, receiver 9 at extreme higher position, isolate the extreme higher position of bucket 10 with
The upper surface of receiver is concordant.
Since grain diameter is of different sizes, its move distance during freely falling body forms material heap will be different,
The bigger particle move distance of particle diameter is more remote, and the grading situation which results in material heap each region from the inside to the outside changes, from
And produce isolation.On this basis, material heap is divided into four regions from the inside to the outside in concentric circles, analyzes the thick of each region
The deviation that aggregate grading curve is produced with former grading curve, i.e., the area surrounded by calculating this two grading curves can obtain
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) final isolation degree can averagely be obtained and refer to by, then using each region coarse aggregate accounting for material heap total mass ratio and being weighted as weight
SD is marked, result of calculation represents that specific formula for calculation is as follows using percentage：
In formula：I=1,2,3,4 be 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 and former grading curve；J is collection material screen
Sequence number, i.e., be respectively the collection of 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm by sieve diameter
Material screen is denoted as 1,2,3,4,5,6,7, No. 8 sieve successively from small to large；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) by each shelves coarse aggregate according to grading ratio carry out dispensing, quality of materialsing for 10-15kg and more than；
2) coarse aggregate is sufficiently mixed uniformly by the way of multiple overturning agitation, be then divided to two by the coarse aggregate mixed
It is secondary to be fitted into funnel 1；
3) by funnel stand 3 be fixed on stent 5 away from support plate 110-130cm at；
4) fully charged funnel 1 is placed on stent 5 and ensures that funnel 1 is in horizontality, rotatable hopper mouth baffle 2,
Coarse aggregate is freely fallen and material heap is formed on receiver 8；
5) receiver 8 is slowly fallen along stent by elevating mechanism 6, material is isolated into when piling up by isolating bucket 10
Four parts；
6) isolation barrel side wall feeding is successively removed from outside to inside and carry out sieve test, obtain the grading of each region coarse aggregate
Curve；
7) isolation level index SD is calculated using formula, repeats above-mentioned experiment at least three times, obtained average value is made
To test obtained final result.
The ratio of gross mass is accounted for as independent variable using each shelves coarse aggregate quality in grading, isolation level index SD is dependent variable,
Regression analysis is carried out to test data using secondary nonlinear multivariable equation, wherein the number of independent variable is with asphalt nominal
Maximum particle diameter is related.By taking AC-16 as an example, coarse aggregate shares 2.36-4.75mm, 4.75-9.5mm, 9.5-13.2mm, 13.2-
Five grades of 16mm, 16-19mm, therefore 5 dependent variables are shared, it is set to X1、X2、X3、X4With X5, it is respectively that each shelves coarse aggregate accounts for gross mass
Ratio.Testing program is determined using uniform mixing design legal system, passes through above-mentioned test procedure and the isolation degree that each group is calculated
Index S D, the results are shown in Table 1.
1 AC-16 each group coarse aggregate ratios of table and isolation test result
Using the result of the test of table 1, multivariate statistics is established using softwares such as Matlab, SPSS, DPS, Mathematica and is returned
Return model, it is as follows to obtain regression equation：
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 examine 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 significant, it is otherwise not notable；Meanwhile inspection of still needing
The conspicuousness of regression coefficient is tested, if Fi≥Fα(1, n-m-1), then it is significantly, otherwise not notable.In the model equation, conspicuousness water
Flat to take α=0.05, independent variable number m=12, observation group number n=16, obtains through looking into F distribution tables：Fα(m, n-m-1)=F0.05(12,
3)=8.74, Fα(1, n-m-1)=F0.05(1,3)=10.13.By statistical software calculate regression equation F values be 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, it is effective under the significance to illustrate equation.
2 model significance test result of table
| 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 |
At the same time to ensure the precision of prediction of regression model, model prediction result and actual tests result are carried out to score
Analysis, the results are shown in Table 3, and the average value of relative error is 0.8%.
3 model prediction accuracy analysis result of table
Analyzed by the significance test of regression model coefficient and model prediction accuracy, which meets the requirements,
It is reliable.
To illustrate the application of regression model equation and verification, in JTG F40-2004《Asphalt highway construction technology is advised
Model》Defined engineering grade 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) be included in table 4, while 3 groups of ratios are substituted into the model equation established above can obtain from
Level index predicted value SD ' (prediction) is analysed, is also included in table 4.It is by the SD (actual measurement) in table 4 and value SD ' (prediction) as it can be seen that although pre-
Measured value and measured value are there are certain deviation, but the sequence of its size is consistent, are group 1 ＜ groups, 3 ＜ groups 2, illustrate grading 1
Isolation degree is minimum.Therefore, the isolation of asphalt can be prejudged according to the model equation that coarse aggregate isolation test is established
Degree.
The test value and predicted value of 4 three grading coarse aggregate proportionings of table and isolation degree
The not yet systematic asphalt mixture segregation appraisement system in China at present, and some existing isolation evaluation indexes are then
Mostly need that the asphalt or bitumen mixture specimen of mixing are tested and evaluated.Relative to it is this have to pass through it is numerous
Trivial experiment can just obtain the way of isolation degree size sequence, and method proposed by the present invention has obvious technical advantage, when
Technical principle clear and definite, evaluation index implication understand, calculate relatively easy；Second, experimental rig comparison is easy, experiment
Process simple possible, tested number and calculation amount are fewer；Third, the isolation of asphalt can be prejudged in the gradation design stage
Degree, theoretical foundation and feasible method are provided for Gradation Optimization design.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications to embodiment will be apparent for those skilled in the art, as defined herein general
Principle can be realized in other embodiments without departing from the spirit or scope of the present invention, is not described in detail
The part presented with partial enlargement, is the prior art, herein without repeating.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 (8)
- A kind of 1. acquisition methods of coarse aggregate isolation degree evaluation index, it is characterised in that by the coarse aggregate mixed in proportion into Row freely falling body forms material heap, will material heap from the center to being divided into n region, 3≤n≤6, by expecting each region coarse aggregate level of heap outside Weighted average with deviation value draws a kind of coarse aggregate isolation degree evaluation index S D, and wherein grading deviation value is thick by each region Aggregate grading curve surrounds area to represent with former grading curve；Isolation degree evaluation index S D is calculated according to equation below：<mrow> <mi>S</mi> <mi>D</mi> <mo>=</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mn>4</mn> </munderover> <msub> <mi>k</mi> <mi>i</mi> </msub> <msub> <mi>&Delta;SD</mi> <mi>i</mi> </msub> <mo>&times;</mo> <mn>100</mn> <mi>%</mi> </mrow><mrow> <msub> <mi>k</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <msub> <mi>m</mi> <mi>i</mi> </msub> <mi>m</mi> </mfrac> </mrow><mrow> <msub> <mi>&Delta;SD</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <munderover> <mo>&Sigma;</mo> <mrow> <mi>j</mi> <mo>=</mo> <mn>2</mn> </mrow> <mn>8</mn> </munderover> <mrow> <mo>(</mo> <mo>|</mo> <msub> <mi>t</mi> <mrow> <msub> <mi>ic</mi> <mi>j</mi> </msub> </mrow> </msub> <mo>-</mo> <msub> <mi>p</mi> <msub> <mi>c</mi> <mi>j</mi> </msub> </msub> <mo>|</mo> <mo>+</mo> <mo>|</mo> <msub> <mi>t</mi> <mrow> <msub> <mi>ic</mi> <mrow> <mi>j</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> </mrow> </msub> <mo>-</mo> <msub> <mi>p</mi> <msub> <mi>c</mi> <mrow> <mi>j</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> </msub> <mo>|</mo> <mo>)</mo> </mrow> <mo>&times;</mo> <mrow> <mo>(</mo> <msup> <msub> <mi>c</mi> <mi>j</mi> </msub> <mn>0.45</mn> </msup> <mo>-</mo> <msup> <msub> <mi>c</mi> <mrow> <mi>j</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mn>0.45</mn> </msup> <mo>)</mo> </mrow> </mrow>In formula：I is regional number, and i=1,2 ..., n, represent n region from inside to outside, 3≤n≤6；kiFor weight, refer to each region rough set Material quality accounts for the ratio of gross mass；ΔSDiArea is surrounded by i regions coarse aggregate grading curve and former grading curve；J is to gather materials Sieve series number, i.e., be respectively 2.36mm, 4.75mm, 9.5mm, 13.2mm, 16mm, 19mm, 26.5mm, 31.5mm by sieve diameter Collection material screen is denoted as 1,2,3,4,5,6,7, No. 8 sieve successively from small to large；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.
- A kind of 2. acquisition methods of coarse aggregate isolation degree evaluation index as claimed in claim 1, it is characterised in that specific step It is rapid as follows：1) it will be fallen according to the coarse aggregate that grading ratio mixes from setting height, material heap formed in receiver；2) receiver moves down under the drive of elevating mechanism, several isolation buckets being arranged concentrically are moved up through receiver, Coarse aggregate on receiver is dropped into isolation bucket；3) feeding screening successively is carried out to the coarse aggregate in isolation bucket from outside to inside, obtains the coarse aggregate level in each isolation bucket Match somebody with somebody；4) weighted average deviateed by each region coarse aggregate grading is worth to isolation degree evaluation index S D；5) repeat step 1)-step 4) at least 3 times, average value is obtained as result of the test.
- 3. the experimental rig for analyzing coarse aggregate isolation degree size, it is characterised in that including：Stent, fixed funnel on stent, funnel are used to hold the coarse aggregate mixed according to grading ratio, and the bottom of funnel can be closed Set, coarse aggregate drops into receiver by funnel, and receiver liftable is arranged on the lower section of funnel, and receiver and Infundibulum septum Setpoint distance is set；The different isolation bucket of several internal diameters for being arranged concentrically, isolation bucket rises and passes through receiver when receiver declines, and falls within Coarse aggregate on receiver is entered in isolation bucket；The receiver is provided with some circles communicated up and down and a circle is used to fix splicing gear chimb, and splicing tray bottom is set Cross reinforcing bar is put to fix receiver, the side wall of each isolation bucket is divided into four sections in order to which cross reinforcing bar passes through；The isolation bucket includes the side wall and is fixed on the support plate of the frame bottom, and support plate upper surface, which is set, to be used for The groove of fixed sidewall；Elevating mechanism is set between the support plate and the receiver；The elevating mechanism is arranged on the outer ring of the stent, and receiver isolates extreme higher position and the splicing of bucket at extreme higher position The upper surface of disk is concordant.
- 4. the device as claimed in claim 3 for being used to analyze coarse aggregate isolation degree size, it is characterised in that the funnel Bottom is set higher than support plate 110-130cm.
- 5. the device as claimed in claim 3 for being used to analyze coarse aggregate isolation degree size, it is characterised in that on receiver The splicing gear bucket of annular is set.
- 6. the device as claimed in claim 3 for being used to analyze coarse aggregate isolation degree size, it is characterised in that the support plate Circumference set beyond the stent；Further, the receiver is equipped with perforate, and the stent is set through perforate.
- 7. one kind using the device for being used to analyze coarse aggregate isolation degree size any one of claim 3-6 is used for Analyze the method for estimating asphalt mixture segregation degree size, it is characterised in that comprise the following steps that：1) determined to use the gear number a of coarse aggregate according to asphalt nominal maximum particle diameter, gross mass is accounted for each shelves coarse aggregate Ratio is independent variable, and isolation degree evaluation index S D is dependent variable, carries out experimental design using uniform mixing design method, formulates examination Proved recipe case；2) according to above-mentioned testing program, degree evaluation index, experimental rig and test method is isolated by coarse aggregate and determine to test The isolation degree evaluation index of each group coarse aggregate in scheme；3) according to above-mentioned result of the test, established by statistical software and total mass ratio is accounted for as independent variable using each shelves coarse aggregate, isolate journey The regression model equation that evaluation index is dependent variable is spent, and the equation to obtaining carries out significance test with regression coefficient；If 4) above-mentioned significance test meets the requirements, the regression equation established is effective, can be used as and estimate asphalt The formula of isolation degree size；If undesirable, repeat step 1)-step 3) meets the requirements until examining；5) when asphalt mixture gradation designs, the coarse aggregate ratio of different designs grading is substituted into above-mentioned model equation to estimate Their isolation degree size, so as to seek that isolation degree is smaller and void in mineral aggregate meets the grading of code requirement again Match somebody with somebody as design level, theoretical foundation and feasible method are provided for Gradation Optimization design.
- A kind of 8. method for estimating asphalt mixture segregation degree size as claimed in claim 7, it is characterised in that The data obtained in the step 2) using Matlab, SPSS, DPS, Mathematica software to step 1) establish polynary system Count regression model.
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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 |
| 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 |
| 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 |
| CN113324848B (en) * | 2021-05-20 | 2022-07-15 | 山东大学 | Low-temperature bending strain test method for asphalt mixture trabecula test piece |
| CN114067931A (en) * | 2021-10-20 | 2022-02-18 | 长安大学 | Asphalt mixture aggregate segregation prediction method |
| CN114486609B (en) * | 2021-12-21 | 2024-02-09 | 中交一公局集团有限公司 | Method for detecting segregation degree of asphalt mixture |
| 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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| CN201449362U (en) * | 2009-09-01 | 2010-05-05 | 陕西交通职业技术学院 | Asphalt mixture measuring instrument |
| CN203083860U (en) * | 2013-01-22 | 2013-07-24 | 卢苏燕 | Aggregate segregation analyzer for asphalt mixture |
| CN104251805A (en) * | 2014-09-26 | 2014-12-31 | 洛阳广鑫建设集团有限公司 | Rapid mixed asphalt material gradation detection method and equipment thereof |
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| US4339203A (en) * | 1980-06-30 | 1982-07-13 | Allis-Chalmers Corporation | Aggregate storage anti-segregation arrangement for a storage bin |
| CN201449362U (en) * | 2009-09-01 | 2010-05-05 | 陕西交通职业技术学院 | Asphalt mixture measuring instrument |
| CN203083860U (en) * | 2013-01-22 | 2013-07-24 | 卢苏燕 | Aggregate segregation analyzer for asphalt mixture |
| CN104251805A (en) * | 2014-09-26 | 2014-12-31 | 洛阳广鑫建设集团有限公司 | Rapid mixed asphalt material gradation detection method and equipment thereof |
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