CN103572683A - Rubber asphalt mixture aggregate gradation optimizing method - Google Patents
Rubber asphalt mixture aggregate gradation optimizing method Download PDFInfo
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- CN103572683A CN103572683A CN201310539404.3A CN201310539404A CN103572683A CN 103572683 A CN103572683 A CN 103572683A CN 201310539404 A CN201310539404 A CN 201310539404A CN 103572683 A CN103572683 A CN 103572683A
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Abstract
The invention discloses a rubber asphalt mixture aggregate gradation optimizing method comprising the steps: calculating the mass fractal dimension value D of a graded aggregate by applying a graded aggregate mass distribution function; taking logarithms at two sides of the graded aggregate mass distribution function, drawing a mass gradation curve of the given aggregate, and calculating the mass fractal dimension value D of the graded aggregate and correlated coefficients R2; and optimizing the gradation of a rubber asphalt mixture aggregate through keeping the mass fractal dimension value of the rubber asphalt mixture aggregate at about 2.4 and possibly increasing the correlated coefficients R2 of the mass gradation curve of the aggregate.
Description
Technical field
The invention belongs to highway construction field, relate in particular to a kind of rubber-asphalt mixture aggregate grading optimization method.
Background technology
Rubber-asphalt mixture, because of its function admirable, cost is relatively cheap, is widely used in highway construction, forms three of environmental protection, twice laid and prolongation road life and wins situation, and economic benefit is huge, therefore obtains the extensive concern of highway construction circle.Yet, for the research of rubber-asphalt mixture aggregate grading, but lacking general theoretical foundation, study limitation is testing than selecting the stage.The application asterisms such as Zhou Chunxiu design the optimal design that an effect surface optimization carries out waste rubber grain asphalt mixture gradation composition, have set up corresponding Mathematical Modeling, have obtained the optimum gradation composition of granulated crumb rubber asphalt mixture.Li Zhengzhongs etc. carry out the mix-design of rubber-asphalt mixture based on GTM mechanics method for designing, by continuous grading the 3 kind gap gradings different with 4.75mm percent of pass carry out system research, obtain the optimization grating form be suitable for GTM rotational forming mode.The clear grade of Ling Tian studied the impact of Ratio of filler bitumen on rubber asphalt rubber cement rut factor and phase angle by laboratory test; Then the specificity of bound rubber pitch, selects and adjusts the mineral aggregate gradation of its rubber-asphalt mixture, using dynamic stability and relative deformation as compound high-temperature behavior evaluation index, draws the mineral aggregate gradation after optimization.Chang Yougong etc. are preliminary on the basis of standard to be determined between suitable grating study area, then by this interval approximate minizone that is divided into some, thereby obtain a series of gratings, and then by Marshall method shaping test piece, by the mensuration of volume index and other technologies index, analyze the pluses and minuses of each grating and finely tune, finally selecting two optimum grading limits, and having carried out the check of pavement performance.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of rubber-asphalt mixture aggregate grading optimization method is provided.
The present invention's adopted scheme of dealing with problems is: a kind of rubber-asphalt mixture aggregate grading optimization method, and the method is: first according to given gradation composition of gathering materials, obtain each grating aggregate quality distribution function:
P(x)=(x/x
max)
3-D；
In formula, P (x) is gathering materials by the quality percentage of square hole screen that particle diameter in this grating is x, and x is aggregate size; x
maxfor the maximum aggregate size in this grating: D is this grating aggregate quality fractal dimension value.
Then, by grating aggregate quality distribution function P (x)=(x/x
max)
3-Dtaking the logarithm in both sides, draws the given quality graduation curve gathering materials, and calculates every kind of grating aggregate quality fractal dimension value D and coefficient R
2.
Finally get grating aggregate quality fractal dimension value D within the scope of 2.35-2.45, and coefficient R
2maximum level manufactures rubber-asphalt mixture aggregate grading.
The invention has the beneficial effects as follows: based on grating aggregate quality distribution function, calculate the fractal dimension value D of the rubber-asphalt mixture aggregate grading of giving, and draw aggregate quality graduation curve, obtain coefficient R
2.According to " rubber-asphalt mixture aggregate grading quality fractal dimension value should be in 2.4 left and right, and the coefficient R of aggregate quality graduation curve
2be the bigger the better " evaluate the good of given aggregate grading.This method is quantitative assessment, has very strong accuracy and scientific and precise.
Accompanying drawing explanation
Fig. 1 is the aggregate quality graduation curve figure of grating A in embodiment;
Fig. 2 is the aggregate quality graduation curve figure of grating B in embodiment;
Fig. 3 is the aggregate quality graduation curve figure of grating C in embodiment;
Fig. 4 is the aggregate quality graduation curve figure of grating D in embodiment.
The specific embodiment
Rubber-asphalt mixture aggregate grading optimization method of the present invention is specially: first according to given gradation composition of gathering materials, obtain each grating aggregate quality distribution function:
P(x)=(x/x
max)
3-D；
In formula, P (x) is gathering materials by the quality percentage of square hole screen that particle diameter in this grating is x, and x is aggregate size; x
maxfor the maximum aggregate size in this grating: D is this grating aggregate quality fractal dimension value.
Then, by grating aggregate quality distribution function P (x)=(x/x
max)
3-Dtaking the logarithm in both sides, draws the given quality graduation curve gathering materials, and calculates every kind of grating aggregate quality fractal dimension value D and coefficient R
2.
Finally get grating aggregate quality fractal dimension value D within the scope of 2.35-2.45, and coefficient R
2maximum level manufactures rubber-asphalt mixture aggregate grading.
Consider that rubber powder is not dissolved in pitch, physical modification is only occurred pitch to, therefore choosing the timing of rubber-asphalt mixture level, can not adopt in a conventional way closely knit aggregate grading.In order to guarantee the high temperature stability performance of rubber-asphalt mixture, its aggregate grading should be chosen thicker type, i.e. the less type of aggregate grading quality fractal dimension value, but aggregate grading quality fractal dimension value can not be too less than normal.According to asphalt mixture gradation aggregate quality, divide dimension characteristic, rubber-asphalt mixture aggregate grading quality fractal dimension value D should be at 2.35-2.45, and the coefficient R of aggregate quality graduation curve
2be the bigger the better.R
2the continuous situation that can reflect aggregate grading, R
2larger, show that this aggregate grading is more continuous, on the contrary also anti-.According to above-mentioned evaluation criterion, given grating is evaluated.Embodiment
Take rubber-asphalt mixture AR-AC13 as example, choose 4 kinds of AR-AC13 aggregate gradings, its composition refers to shown in following table.
Table 1: the gradation composition of gathering materials
Based on aggregate grading in table 1, form, according to grating aggregate quality distribution function, taken the logarithm in grating aggregate quality distribution function both sides, draw out corresponding aggregate quality graduation curve, as shown in accompanying drawing 1～accompanying drawing 4.
Aggregate quality graduation curve in 1～accompanying drawing 4, calculates grating aggregate quality fractal dimension value D and coefficient R with reference to the accompanying drawings
2.Above-mentioned 4 kinds of grating aggregate quality fractal dimension values, descending, be followed successively by grating C(2.5343) > grating D(2.3861) > grating B(2.3551) > grating A(2.2889).The quality fractal dimension value D of grating A is too less than normal, and between mineral aggregate, porosity is bigger than normal, and is to guarantee its compound functional performance, can only increase, with the large rubber-asphalt mixture of oil mass easy bellding in use with oil mass.The quality fractal dimension value D of grating C is too bigger than normal, and between mineral aggregate, porosity is less than normal, and rubber-asphalt mixture high temperature stability performance is poor.
The coefficient R of grating B aggregate quality graduation curve
2(0.9384) than the coefficient R of grating D aggregate quality graduation curve
2(0.9864) little, in above-mentioned 4 kinds of rubber-asphalt mixture aggregate gradings, that best is grating D.
Claims (1)
1. a rubber-asphalt mixture aggregate grading optimization method, is characterized in that, the method is: first according to given gradation composition of gathering materials, obtain each grating aggregate quality distribution function:
P(x)=(x/x
max)
3-D；
In formula, P (x) is gathering materials by the quality percentage of square hole screen that particle diameter in this grating is x, and x is aggregate size; x
maxfor the maximum aggregate size in this grating: D is this grating aggregate quality fractal dimension value.
Then, by grating aggregate quality distribution function P (x)=(x/x
max)
3-Dtaking the logarithm in both sides, draws the given quality graduation curve gathering materials, and calculates every kind of grating aggregate quality fractal dimension value D and coefficient R
2.
Finally get grating aggregate quality fractal dimension value D within the scope of 2.35-2.45, and coefficient R
2maximum level manufactures rubber-asphalt mixture aggregate grading.
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|---|---|---|---|
| CN201310539404.3A CN103572683A (en) | 2013-11-04 | 2013-11-04 | Rubber asphalt mixture aggregate gradation optimizing method |
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|---|---|---|---|
| CN201310539404.3A CN103572683A (en) | 2013-11-04 | 2013-11-04 | Rubber asphalt mixture aggregate gradation optimizing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982256A (en) * | 2018-07-27 | 2018-12-11 | 浙江大学 | A kind of anti-shearing tired asphalt mixture gradation optimization method based on virtual repetition penetration test |
| CN109541189A (en) * | 2018-11-30 | 2019-03-29 | 苏交科集团股份有限公司 | A kind of rubber-asphalt mixture grading limit determines method and system |
| CN109883899A (en) * | 2019-01-30 | 2019-06-14 | 中北大学 | The method that mixed coarse aggregate crushing test determines fractal dimension |
| CN109883900A (en) * | 2019-01-30 | 2019-06-14 | 中北大学 | The method that single coarse aggregate determines the method for fractal dimension and determines aggregate grading |
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| EP0587816B1 (en) * | 1991-06-05 | 1995-02-22 | CAUSYN, David W. | Recycled rubber in a polymer modified asphalt and a method of making same |
| US6000876A (en) * | 1997-07-16 | 1999-12-14 | Der-Hsien Shen | Content and production method for semi-rigid asphalt concrete |
| CN102276993A (en) * | 2011-06-07 | 2011-12-14 | 南京中公材料科技发展有限公司 | High-toughness composite SBR modified asphalt for warm-mixed asphalt technology, and preparation method thereof |
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| EP0587816B1 (en) * | 1991-06-05 | 1995-02-22 | CAUSYN, David W. | Recycled rubber in a polymer modified asphalt and a method of making same |
| US6000876A (en) * | 1997-07-16 | 1999-12-14 | Der-Hsien Shen | Content and production method for semi-rigid asphalt concrete |
| CN102276993A (en) * | 2011-06-07 | 2011-12-14 | 南京中公材料科技发展有限公司 | High-toughness composite SBR modified asphalt for warm-mixed asphalt technology, and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982256A (en) * | 2018-07-27 | 2018-12-11 | 浙江大学 | A kind of anti-shearing tired asphalt mixture gradation optimization method based on virtual repetition penetration test |
| CN108982256B (en) * | 2018-07-27 | 2020-04-17 | 浙江大学 | Shear fatigue resistant asphalt mixture gradation optimization method based on virtual repeated penetration test |
| CN109541189A (en) * | 2018-11-30 | 2019-03-29 | 苏交科集团股份有限公司 | A kind of rubber-asphalt mixture grading limit determines method and system |
| CN109883899A (en) * | 2019-01-30 | 2019-06-14 | 中北大学 | The method that mixed coarse aggregate crushing test determines fractal dimension |
| CN109883900A (en) * | 2019-01-30 | 2019-06-14 | 中北大学 | The method that single coarse aggregate determines the method for fractal dimension and determines aggregate grading |
| CN109883900B (en) * | 2019-01-30 | 2021-05-25 | 中北大学 | Method for determining fractal dimension of single coarse aggregate and method for determining aggregate gradation |
| CN109883899B (en) * | 2019-01-30 | 2021-05-25 | 中北大学 | Method for determining fractal dimension through mixed coarse aggregate crushing test |
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Application publication date: 20140212 |