CN107572896B - A kind of AC-20 modified asphalt mixture design method based on pavement performance - Google Patents
A kind of AC-20 modified asphalt mixture design method based on pavement performance Download PDFInfo
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- CN107572896B CN107572896B CN201610522696.3A CN201610522696A CN107572896B CN 107572896 B CN107572896 B CN 107572896B CN 201610522696 A CN201610522696 A CN 201610522696A CN 107572896 B CN107572896 B CN 107572896B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 48
- 239000000203 mixture Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000013461 design Methods 0.000 title claims abstract description 23
- 238000012795 verification Methods 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 7
- 239000011707 mineral Substances 0.000 claims abstract description 7
- 238000007689 inspection Methods 0.000 claims abstract description 6
- 239000011148 porous material Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 5
- 239000011800 void material Substances 0.000 claims description 4
- 238000012512 characterization method Methods 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 238000012430 stability testing Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 2
- 238000011056 performance test Methods 0.000 abstract 1
- 238000011160 research Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Abstract
The invention belongs to technical field of road engineering, more particularly to a kind of AC-20 modified asphalt mixture design method based on pavement performance.According to the weather of the Northeast, traffic and material characteristics, by a large amount of pavement performance test, Asphalt Mixture Performance prediction model and gradation verification prediction model are established using fractal theory；With reference to the requirement in current specifications, propose the Northeast's bituminous pavement meet pavement performance requirement bituminous mixture aggregate gradation fractal dimension and thick, fine aggregate fractal dimension range；Select corresponding fractal dimension as design parameter in the range of proposed, the percent of pass of each sieve pore of mineral aggregate is derived by fractal dimension, Asphalt Mixture Performance inspection is carried out by the pavement performance prediction model of foundation, the inspection of gradation skeleton is carried out using gradation verification prediction model, verification experimental verification finally is carried out to the asphalt for meeting estimated performance requirement, and then obtains the good gradation for meeting performance requirement.
Description
Technical field
The invention belongs to technical field of road engineering, more particularly to a kind of AC-20 modified pitch based on pavement performance
Mixture Design Method.
Background technique
For a long time, the mixing proportion design method of asphalt is always the research weight of road researcher and builder
Point.Most countries use Marshall method designing asphalt mixture in the world at present, and China is no exception.But through excessive
After the engineering practice detection in year, people gradually recognize Marshall method, and there are many deficiencies, such as specimen molding and reality
Border work progress is variant, and shaping method of specimen is unable to simulated driving compacting, cannot reflect, optimizes and predict the usability on road surface
Energy is equal, although Marshall Test indices all meet code requirement, the diseases such as bad, track of Pavement Condition are tight
Weight.
Summary of the invention
For the above technical problems, the present invention provides a kind of AC-20 modified pitch mixing based on pavement performance
Expect design method, the design method of asphalt is connected with pavement performance, is reduced by optimization design unnecessary
Tested number.
The technical scheme is that
A kind of AC-20 modified asphalt mixture design method based on pavement performance, the process of the design method are as follows:
(1) by carrying out high temperature to AC-20 modified asphalt mixture, low temperature and water stability testing are studied, using dividing shape
Theory establishes the shape-division model of asphalt and its internal voids that gather materials, and proposes characterization mixture and its aggregate void point
The parameter of shape feature establishes AC-20 modified asphalt mixture pavement performance prediction model and gradation verification prediction model；
(2) meet pavement performance requirement bituminous mixture aggregate gradation fractal dimension and coarse aggregate, fine aggregate point shape
It in the range of dimension, selects corresponding fractal dimension as design parameter, passing through for each sieve pore of mineral aggregate is derived by fractal dimension
Rate carries out Asphalt Mixture Performance inspection by the pavement performance prediction model of foundation, utilizes gradation verification prediction model
The inspection of gradation skeleton is carried out, verification experimental verification finally is carried out to the asphalt for meeting estimated performance requirement, and then met
The good gradation of performance requirement.
The AC-20 modified asphalt mixture design method based on pavement performance, specifically comprises the following steps:
(1) fractal dimension is chosen
AC-20 modified asphalt mixture gradation meets the fractal dimension D of pavement performance requirement, DCAnd DfRange are as follows:
Fractal dimension D=2.4535~2.5835, D of high-temperature stabilityC=2.3988~2.6229, Df=2.3127~
2.5468；
Fractal dimension D=2.3388~2.5835, D of low-temperature cracking-resistanceC=2.3048~2.5171, Df=2.3734~
2.5870；
Fractal dimension D=2.4171~2.5993, D of water stabilityC=2.4080~2.6102, Df=2.3420~
2.5669；
Fractal dimension D=2.4535~2.5835, D of comprehensive performanceC=2.4080~2.5171, Df=2.3734~
2.5468；
(2) mineral aggregate percent of pass is calculated
By the values of fractal dimension chosen, formula (1-1) and formula (1-2) are substituted into:
As r ∈ (PCS, NMPS),
When r ∈ (0.075, PCS),
In formula, PCS is the boundary spot size that thickness is gathered materials, mm；NMPS is nominal maximum particle diameter size, mm；R is to gather materials
Grain particle size size, is indicated, mm with screen size size；rminFor aggregate particle minimum grain size size, mm；D is aggregate particle
The fractal dimension of particle diameter distribution, as aggregate grading fractal dimension；Dc is aggregate particle partial size gradation within the scope of NMPS~PCS
Fractal dimension, as coarse aggregate fractal dimension；DfFor aggregate particle partial size within the scope of PCS~0.075mm gradation fractal dimension,
As fine aggregate fractal dimension；P0For the percent of pass at nominal maximum particle diameter NMPS；P (PCS) is cut-off point of the coarse and fine aggregate size
Percent of pass；P (r) is the percent of pass at aggregate particle partial size r；
(3) pavement performance is predicted
By scheme comparison, the AC-20 modified asphalt mixture pavement performance prediction model of use is as follows:
The prediction model of high-temperature stability, DS=3206.5+16056.8D-2605.5Dc-14025.4Df, regression coefficient
0.9370；
The prediction model of low-temperature cracking-resistance, εB=-524.3-2779.6D+2999.9Dc+1210.9Df, regression coefficient
0.9446；
The prediction model of water stability, DSR=-1.2919+0.3012D+0.3414Dc+0.2462Df, regression coefficient
0.9417；
Wherein, DS is dynamic stability, εBFor failure strain, DSR is dynamic stability ratio；
It is anti-to the high-temperature stability of AC-20 modified asphalt mixture, low temperature according to the pavement performance prediction model established
Fragility and water stability can be carried out prediction；In prediction model, pass through fractal dimension D, Dc、DfCalculate each index predicted value；If no
Meet pavement performance requirement, choose fractal dimension again in recommended range, until prediction result is all satisfied pavement performance requirement
Until；
(4) gradation verification
Gradation verification is carried out by the related prediction model between the fractal product parameter established and fractal dimension, predicts mould
Type is as follows:
Coarse aggregate fractal accumulates voidage Vco=-1.5783-0.4599Dc+1.2698Df, regression parameter R2=0.9439；
Fractal product V of the fine aggregate in coarse aggregatef=-1.0892+0.6795Dc-0.1456Df, regression parameter R2=
0.9741；
Vco≥Vf, 1.1394Dc-1.4154Df≤0.4891；
The thick of the gradation of pavement performance requirement will be met, fine aggregate fractal dimension substitutes into coarse aggregate point shape voidage VcoWith it is thin
Gather materials the fractal product V in coarse aggregatefPrediction model is predicted and is examined；Divide shape voidage V when coarse aggregatecoGreater than thin
Gather materials the fractal product V in coarse aggregatefWhen, coarse aggregate is capable of forming effective skeleton；Such as not formed skeleton, FRACTAL DIMENSION is adjusted
Number, until forming skeleton；
(5) experimental examination
To the gradation for meeting above-mentioned steps, the high-temperature stability, cryogenic property and water stability road of asphalt are carried out
Use service check；It is such as all satisfied requirement, then the gradation designed is qualification；It is such as unsatisfactory for requiring, be set again by aforementioned method steps
Gradation is counted, until meeting the requirements.
It advantages of the present invention and has the beneficial effect that:
1, for current Chinese code of practice Asphalt Mixture Design method-marshall' mechanic characteristic value deficiency, in conjunction with China east
The features such as northern local climate, traffic, material, at home and abroad on the basis of research achievement and practical experience, to AC-20 modified pitch
Mixture carries out high and low temperature and water stability testing research, establishes asphalt using fractal theory and its internal sky that gathers materials
The shape-division model of gap proposes the parameter of characterization mixture and its aggregate void fractal characteristic, establishes AC-20 modified pitch
Mixture gradation examines prediction model.
2, the present invention establishes AC-20 modified asphalt mixture and its aggregate void fractal characteristic parameter, aggregate grading point
The relationship of the evaluation indexes such as shape dimension and volume index, high-temperature stability, low-temperature cracking-resistance, water stability, establishes and is suitable for
The AC-20 modified asphalt mixture pavement performance prediction model that the Northeast uses.
3, the present invention proposes Asphalt Mixture Design method of the Northeast based on pavement performance, makes setting for asphalt
Meter method is connected with pavement performance, and optimization is realized in asphalt mixture gradation design calculation process, saves time, people
Power, material resources and financial resources have important research significance.
Specific embodiment
Below with reference to embodiment, the present invention will be described in detail.
Embodiment 1
In the present embodiment, the AC-20 modified asphalt mixture design method based on pavement performance specifically includes following step
It is rapid:
1. choosing fractal dimension
As shown in table 1, fractal dimension D, the D of the AC-20 modified asphalt mixture gradation proposedCAnd DfRange be
The integrating paradigm derived under the premise of meeting pavement performance, it is proposed that value in the range of fractal dimension.
1 AC-20 modified asphalt mixture of table meets the fractal dimension range of pavement performance requirement
| Technical requirements | D | Dc | Df |
| High-temperature stability/60 DEG C | 2.4535~2.5835 | 2.3988~2.6229 | 2.3127~2.5468 |
| Low-temperature cracking-resistance/- 10 DEG C | 2.3388~2.5835 | 2.3048~2.5171 | 2.3734~2.5870 |
| Water stability | 2.4171~2.5993 | 2.4080~2.6102 | 2.3420~2.5669 |
| Comprehensive performance | 2.4535~2.5835 | 2.4080~2.5171 | 2.3734~2.5468 |
2. calculating mineral aggregate percent of pass
By the values of fractal dimension chosen, formula (1-1) and formula (1-2) are substituted into
As r ∈ (PCS, NMPS),
When r ∈ (0.075, PCS),
In formula, PCS (primary control sieve between coarse and fine aggregate) is thick
The boundary spot size of fine aggregate, mm；NMPS (normal maximum particle sieve) is nominal maximum particle diameter size,
mm；R is aggregate particle particle size size, is indicated with screen size size, mm；rminFor aggregate particle minimum grain size size,
mm；D is the fractal dimension of aggregate particle particle diameter distribution, referred to as aggregate grading fractal dimension；Dc is that aggregate particle partial size exists
Gradation fractal dimension within the scope of NMPS~PCS, as coarse aggregate fractal dimension；DfIt is aggregate particle partial size in PCS~0.075mm
Gradation fractal dimension in range, as fine aggregate fractal dimension；P0For the percent of pass at nominal maximum particle diameter NMPS；P (PCS) is
Cut-off point of the coarse and fine aggregate size percent of pass；P (r) is the percent of pass at aggregate particle partial size r.
3. predicting pavement performance
Through multi-scheme than selecting, recommend the AC-20 modified asphalt mixture pavement performance prediction model used, as shown in table 2.
2 AC-20 modified asphalt mixture pavement performance prediction model of table
Wherein, DS is dynamic stability, εBFor failure strain, DSR is dynamic stability ratio.
By the pavement performance prediction model established in table 2 to the high temperature, low temperature and water of AC-20 modified asphalt mixture
Stability is predicted.In prediction model, need through fractal dimension D, Dc、DfCalculate each index predicted value.If be unsatisfactory for
Pavement performance requirement, chooses fractal dimension, until prediction result is all satisfied pavement performance requirement again in recommended range.
4. gradation verification
According to research achievement, grade collating is carried out by the correlation model between the fractal product parameter established and fractal dimension
It tests.The thick of the gradation of pavement performance requirement will be met, fine aggregate fractal dimension substitutes into coarse aggregate point shape voidage VcoAnd fine aggregate
Fractal product V in coarse aggregatefPrediction model is predicted and is examined.Divide shape voidage V when coarse aggregatecoGreater than fine aggregate
Fractal product V in coarse aggregatefWhen, coarse aggregate is capable of forming effective skeleton.Such as not formed skeleton, fractal dimension is adjusted,
Until forming skeleton.AC-20 modified asphalt mixture gradation verification prediction model, as shown in table 3.
3 AC-20 modified asphalt mixture gradation verification prediction model of table
5. experimental examination
To the gradation for meeting above-mentioned steps, high-temperature stability, cryogenic property and water stability of asphalt etc. are carried out
Pavement performance is examined, and requirement is such as all satisfied, then the gradation designed is qualification.It is such as unsatisfactory for requiring, searches reason, correct in time,
Or gradation is redesigned by aforementioned method steps, until meeting the requirements.
Embodiment the result shows that, the features such as present invention is according to the weather of the Northeast, traffic and material, with reference to current specifications
In requirement, propose the widely applied bituminous mixture aggregate grade partition for meeting pavement performance requirement of the Northeast's bituminous pavement
Shape dimension and thick, fine aggregate fractal dimension range；Corresponding fractal dimension is selected to join in the range of proposed as design
Number derives the percent of pass of each sieve pore of mineral aggregate by fractal dimension, carries out pitch mixing by the pavement performance prediction model of foundation
Material tube performance prediction carries out the inspection of gradation skeleton using gradation verification prediction model, finally to meeting pavement performance requirement
Asphalt carries out verification experimental verification, and then obtains the good gradation for meeting performance requirement.To optimization design, it is unnecessary to reduce
Tested number.
Claims (1)
1. a kind of AC-20 modified asphalt mixture design method based on pavement performance, which is characterized in that the mistake of the design method
Journey is as follows:
(1) it is studied by carrying out high temperature, low temperature and water stability testing to AC-20 modified asphalt mixture, utilizes fractal theory
The shape-division model of asphalt and its internal voids that gather materials is established, proposes that characterization mixture and its aggregate void divide shape special
The parameter of sign establishes AC-20 modified asphalt mixture pavement performance prediction model and gradation verification prediction model；
(2) in bituminous mixture aggregate gradation fractal dimension and coarse aggregate, the fine aggregate fractal dimension for meeting pavement performance requirement
In the range of, it selects corresponding fractal dimension as design parameter, the percent of pass of each sieve pore of mineral aggregate is derived by fractal dimension, lead to
It crosses the pavement performance prediction model established and carries out Asphalt Mixture Performance inspection, carry out grade using gradation verification prediction model
It is examined with skeleton, verification experimental verification finally is carried out to the asphalt for meeting estimated performance requirement, and then obtain meeting performance and want
The good gradation asked；
The AC-20 modified asphalt mixture design method based on pavement performance, specifically comprises the following steps:
(1) fractal dimension is chosen
AC-20 modified asphalt mixture gradation meets the fractal dimension D of pavement performance requirement, DCAnd DfRange are as follows:
Fractal dimension D=2.4535~2.5835, D of high-temperature stabilityC=2.3988~2.6229, Df=2.3127~
2.5468；
Fractal dimension D=2.3388~2.5835, D of low-temperature cracking-resistanceC=2.3048~2.5171, Df=2.3734~
2.5870；
Fractal dimension D=2.4171~2.5993, D of water stabilityC=2.4080~2.6102, Df=2.3420~2.5669；
Fractal dimension D=2.4535~2.5835, D of comprehensive performanceC=2.4080~2.5171, Df=2.3734~2.5468；
(2) mineral aggregate percent of pass is calculated
By the values of fractal dimension chosen, formula (1-1) and formula (1-2) are substituted into:
As r ∈ (PCS, NMPS),
When r ∈ (0.075, PCS),
In formula, PCS is the boundary spot size that thickness is gathered materials, mm；NMPS is nominal maximum particle diameter size, mm；R is aggregate particle grain
Diameter size is indicated, mm with screen size size；rminFor aggregate particle minimum grain size size, mm；D is aggregate particle partial size
The fractal dimension of distribution, as aggregate grading fractal dimension；Dc is aggregate particle partial size grade partition shape within the scope of NMPS~PCS
Dimension, as coarse aggregate fractal dimension；DfFor aggregate particle partial size within the scope of PCS~0.075mm gradation fractal dimension, as
Fine aggregate fractal dimension；P0For the percent of pass at nominal maximum particle diameter NMPS；P (PCS) is that cut-off point of the coarse and fine aggregate size passes through
Rate；P (r) is the percent of pass at aggregate particle partial size r；
(3) pavement performance is predicted
By scheme comparison, the AC-20 modified asphalt mixture pavement performance prediction model of use is as follows:
The prediction model of high-temperature stability, DS=3206.5+16056.8D-2605.5Dc-14025.4Df, regression coefficient
0.9370；
The prediction model of low-temperature cracking-resistance, εB=-524.3-2779.6D+2999.9Dc+1210.9Df, regression coefficient 0.9446；
The prediction model of water stability, DSR=-1.2919+0.3012D+0.3414Dc+0.2462Df, regression coefficient 0.9417；
Wherein, DS is dynamic stability, εBFor failure strain, DSR is dynamic stability ratio；
High-temperature stability, low-temperature cracking-resistance according to the pavement performance prediction model established to AC-20 modified asphalt mixture
It can be carried out prediction with water stability；In prediction model, pass through fractal dimension D, Dc、DfCalculate each index predicted value；If be unsatisfactory for
Pavement performance requirement, chooses fractal dimension, until prediction result is all satisfied pavement performance requirement again in recommended range；
(4) gradation verification
Gradation verification is carried out by the related prediction model between the fractal product parameter established and fractal dimension, prediction model is such as
Under:
Coarse aggregate fractal accumulates voidage Vco=-1.5783-0.4599Dc+1.2698Df, regression parameter R2=0.9439；
Fractal product V of the fine aggregate in coarse aggregatef=-1.0892+0.6795Dc-0.1456Df, regression parameter R2=0.9741；
Vco≥Vf, 1.1394Dc-1.4154Df≤0.4891；
The thick of the gradation of pavement performance requirement will be met, fine aggregate fractal dimension substitutes into coarse aggregate point shape voidage VcoAnd fine aggregate
Fractal product V in coarse aggregatefPrediction model is predicted and is examined；Divide shape voidage V when coarse aggregatecoGreater than fine aggregate
Fractal product V in coarse aggregatefWhen, coarse aggregate is capable of forming effective skeleton；Such as not formed skeleton, fractal dimension is adjusted,
Until forming skeleton；
(5) experimental examination
To the gradation for meeting above-mentioned steps, the high-temperature stability, cryogenic property and water stability road property of asphalt are carried out
It can examine；It is such as all satisfied requirement, then the gradation designed is qualification；It is such as unsatisfactory for requiring, redesigns grade by aforementioned method steps
Match, until meeting the requirements.
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| CN101318794B (en) * | 2008-07-16 | 2011-01-26 | 兰州交通大学 | Asphalt mixture mixing proportion design method based on inert solid fractal distribution characteristic |
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