CN110194612A - A kind of Recycled Asphalt Pavement material and its design method ensureing cryogenic property - Google Patents
A kind of Recycled Asphalt Pavement material and its design method ensureing cryogenic property Download PDFInfo
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- CN110194612A CN110194612A CN201910231060.7A CN201910231060A CN110194612A CN 110194612 A CN110194612 A CN 110194612A CN 201910231060 A CN201910231060 A CN 201910231060A CN 110194612 A CN110194612 A CN 110194612A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The present invention is a kind of Recycled Asphalt Pavement material and its design method for ensureing cryogenic property, and the Recycled Asphalt Pavement includes consisting of: gathering materials: 46.8~70 parts by mass；Old pavement digs the old material that Xian obtains: 17.4~46.8 parts；3.7~7 parts of miberal powder；Modified pitch or No. 70 2.8~6.1 parts of matrix pitch；The nominal maximum aggregate size that gathers materials is 26.5mm.Design method is as follows: 1) carrying out physical mechanics test to asphalt material, 2) significant 4.75mm partial size or less is influenced for cryogenic property to gather materials, 3) test 19mm partial size gather materials tamping forming after volumetric filling ratio, 4) asphalt content is determined by wheel tracking test and low temperature the small beam experiment, and verifies material property.The present invention is compared with existing Recycled Asphalt Pavement material and design method; it can guarantee the superiority of material at low temperature performance; guarantee that material property variation is smaller; and high-temperature stability and water stability are excellent; make full use of old material; it economizes on resources, protect environment, and substantially reduce Seasonal freezing areas ground surface material cost.
Description
Technical field
The present invention relates to a kind of Recycled Asphalt Pavement materials and its design method for ensureing cryogenic property, belong to building work
Journey (road engineering) technical field.
Background technique
With the rapid development of the national economy, the mileage open to traffic in China is continuously increased, nowadays, China is built in highway
If huge achievement is achieved in, by the end of the year 2013, highway in China construction total kilometrage surmounts the U.S., occupies the first in the world.
China Seasonal freezing areas area accounts for Chinese territory half of the area or more, but has asphalt concrete material and Recycled Asphalt Pavement
The asphalt concrete material of design of material method design is easy to crack on a large scale under the conditions of low temperature and vehicular load, for the public
Traffic safety and road-ability have an immense impact on.
Recycled Asphalt Pavement material digs the broken obtained old asphalt concrete of Xian to old pavement and is reused, and helps
In economizing on resources, protect environment.But old material of the Recycled Asphalt Pavement material of prior art design due to joined aging,
Often cryogenic property is very poor and material variability is big, it is difficult to keep not cracking for a long time under cryogenic, it is mixed to limit pitch
The development of solidifying soil regeneration techniques.
Fines ingredient (4.75mm or less partial size gathers materials) in bituminous concrete the holding at low temperature for bituminous concrete
Load power and road surface service level have compared to coarse fodder ingredient more to be significantly affected, as can optimized for fines gradation,
There is obvious realistic meaning for the raising of the service performance of reclaimed bituminous pavement under cryogenic.Gradation Optimization design
Principle are as follows: low temperature performance of asphalt is preferable when voidage is smaller, the pitch that 1.18mm sieve pore percent of pass obtains design
Concrete voids rate is affected；0.075mm or less aggregate particle specific surface area is larger, therefore it is dripped under identical bitumen aggregate ratio
Green film thickness is smaller, so that deformability weakens between asphalt particle under low temperature.Therefore voidage, miberal powder dosage reduce
For improving low temperature performance of asphalt important role.Additionally due to mixture gradation especially old material gradation has
Definite variability should also be no more than certain value from control old material volume and guarantee gradation variance factor to concrete voids rate shadow
It rings smaller aspect to start with, guarantees the cryogenic property of material.
The present invention is compared with existing Recycled Asphalt Pavement material and design method, it is ensured that material at low temperature performance it is excellent
The opposite sex guarantees that material property variation is smaller, and high-temperature stability and water stability are excellent, make full use of old material, economize on resources,
Environment is protected, and substantially reduces Seasonal freezing areas ground surface material cost.
Summary of the invention
Technical problem: the present invention is compared with existing Recycled Asphalt Pavement material and design method, it is ensured that material is low
The superiority of warm nature energy guarantees that material property variation is smaller, and high-temperature stability is excellent, makes full use of old material, economizes on resources,
Environment is protected, and substantially reduces Seasonal freezing areas ground surface material cost.
Technical solution: a kind of Recycled Asphalt Pavement material of guarantee cryogenic property of the invention substitutes part using old material
Gather materials, by mass include consisting of:
Gather materials: 46.8%~70%；
Old material: 17.4%~46.8%；
Old material and gross mass of gathering materials: 87.4%~94.5%；
Miberal powder: 3.7%~7%；
Modified pitch or No. 70 matrix pitches 2.8%~6.1%；
The limestone aggregates are particle size range between 0.075mm~31.0mm；The limestone aggregates are not
With the limestone aggregates of mechanical fraction, mixed by 2 kinds, 3 kinds or 4 kinds in rubble, melon seeds piece, meter Zi and mountain flour；
And the 50%-55% of the above total aggregate quality of aggregate quality Zhan of 4.75mm partial size.
The old material be particle size range 0.075mm~31.0mm it；The old material is that different-grain diameter is combined from old
Dig the broken obtained asphalt of Xian in road surface；And the 50%- of the total old material quality of the above old material quality Zhan of 4.75mm partial size
55%.
The pitch is No. 70 matrix pitches of label or the good modified pitch of cryogenic property, meets 25 DEG C of needle penetrations and is situated between
In 60~80, softening point >=45 DEG C, 10 DEG C of ductilities >=15cm and JTG F40-2017 " advise by asphalt highway construction technology
Model " in for No. 70 pitch related request.
The design method of the Recycled Asphalt Pavement material of guarantee cryogenic property of the invention a kind of the following steps are included:
1) basic chemically and physically mechanical index is carried out to asphalt sample to test, specify the basic physical mechanics property of material
Energy；
2) significant 4.75mm partial size or less is influenced for cryogenic property to gather materials and miberal powder, by trigonometric coordinates method to miberal powder,
0.075~1.18mm partial size, which gathers materials, 1.18~4.75mm partial size gathers materials selects multiple gradations progress voidage measurement tests, with
Voidage and 0.075mm or less aggregate content determine the following aggregate grading of 4.75mm partial size, and gradation requires voidage smaller and mine
Powder content is less；
3) test 19mm partial size gather materials tamping forming after volumetric filling ratio, by stage filling principle design 4.75mm partial size
The above aggregate grading；
4) under the premise of guaranteeing that old material dosage is less than aggregate quality, by design old material mixture proportion with 2), 3) in it is determining
Gradation mixes old material；
5) fracture of dynamic stability index and low temperature bend test measurement that asphalt content is measured by wheel tracking test is selected
Energy index carries out the ratio choosing of asphalt optimum content, than selecting obtained asphalt optimum content, if designing gradation under this asphalt content
Mixture, which is not met in JTG F40-2017 " standard specification for construction and acceptance of highway asphalt pavement ", refers to dynamic stability in wheel tracking test
Failure strain index and the requirement of immersion Marshall test residual stability, re-start step 2) in mark and low temperature bend test.
Mechanics index of physics described in step 1) tests pointer penetration test, softening point test, 10 DEG C of ductility tests.
Step 2) carries out preferably fines gradation, and the trigonometric coordinates method used is by the fine aggregate of 4.75mm or less partial size
It is divided into three 1.18~4.75mm partial size, 0.075~1.18mm partial size, miberal powder (0.075mm or less partial size) ranges, is standardizing
AC grading limit is expanded, that is, presses certain AC 1.18~4.75mm of gradation partial size, 0.075~1.18mm partial size, miberal powder
(0.075mm or less partial size) three ranges expand respectively, reduce 1.5 times obtains expanding grading limit bound；Triangle is defined to sit
Three coordinates of target are as follows: X-axis 1.18~4.75mm partial size aggregate content, Y-axis 0.075~1.18mm partial size aggregate content, Z axis
Miberal powder (0.075mm or less partial size) content；It is straight that 3 groups of each 2 for being parallel to X, Y, Z axis are drawn by the grading limit that expansion obtains
Line is selected folded trapezoidal as shown in 1 in attached drawing 3 in parallel lines；Three points are carried out on trapezoidal four edges, respectively take four points, such as
Shown in 2 in attached drawing 3, separately desirable four side midpoint lines, are added 5 intermediate benefit measuring points, and totally 17 points carry out voidage survey at this time
Fixed test；Voidage contour map is drawn, such as attached drawing 4, voidage contour map is drawn according to test result, first contour
Voidage Minimum Area is chosen in line chart selects the gradation of miberal powder minimum in the area later such as 6 regions among attached drawing 4
For fine aggregate gradation.It is reason for this is that low temperature performance of asphalt is preferable when voidage is smaller, 1.18mm sieve pore percent of pass pair
It is affected in the bituminous concrete voidage that design obtains, and 0.075mm or less partial size aggregate particle specific surface area is larger,
Therefore its asphalt membrane thickness is smaller under identical bitumen aggregate ratio, so that deformability weakens between asphalt particle under low temperature；It adopts
Voidage measurement test be it is as shown in Fig. 5, A sets in figure for the actual load of hitting of marshall compaction instrument, and B is Marshall die trial
The fine aggregate gradation that pitch is not added inside is held, C is supporting surface；The fines grade that pitch is not added, which fits over, has a rest in Marshall container through horse
You strike 75 times compaction test apparatus single side, hit real density with mold height calculating；By measure the apparent density gathered materials of different-grain diameter by
The integral density of integral density formula calculating different gradation；By integral density and hits real density value and obtain the test side of voidage
Method.
Stage filling principle described in step 3) be test 19mm partial size gather materials tamping forming after volumetric filling ratio V0Afterwards,
The theory gradation of coarse aggregate is calculated, wherein ViThe percentage by volume gathered materials for i-th grade, diThe partial size to gather materials for i grades.
Incorporation old material quality strict control described in step 4) is less than aggregate quality, guarantees the variability symbol of this material property
It closes and requires.
The utility model has the advantages that compared with prior art, the present invention has following beneficial fruit:
1, the asphalt concrete material design method of the novel guarantee cryogenic property in the design of fine aggregate gradation to passing through
Trigonometric coordinates method selectes ratio and selects gradation, hits the real fine aggregate 75 times methods that pitch is not added using marshall compaction instrument single side and obtains
To material void rate, the proportion choosing of fine aggregate grade is carried out, test and calculation method are simple and effective, avoid a variety of gradations of test
Cryogenic property and pitch is added and makes tested number and test complexity the case where greatly increasing；
2, the bituminous concrete of the asphalt concrete material design method design of the novel guarantee cryogenic property, using old
Under the premise of the old material substitution part of change gathers materials, the excellent of material at low temperature performance can guarantee for the optimization design of fine aggregate gradation
It is anisotropic；Limitation old material quality, which is less than aggregate quality i.e., after thickness aggregate grading is selected can control old material to guarantee that material property becomes
It is different smaller；And high-temperature stability and water stability are excellent, old material utilization rate economizes on resources up to 40%, protects environment, significantly
Reduce Seasonal freezing areas ground surface material cost.
Detailed description of the invention
Fig. 1 is a kind of process of the design method of Recycled Asphalt Pavement material for ensureing cryogenic property provided by the invention
Block diagram；
Fig. 2 be Recycled Asphalt Pavement material schematic diagram provided by the invention, 1 for old material, gather materials in 4.75mm partial size
Following fines and pitch composition asphalt mortar, bituminous mortar, 2 for old material, gather materials in the above coarse fodder of 4.75mm partial size；
Fig. 3 is the trigonometric coordinates method schematic diagram that fines gradation is selected in Recycled Asphalt Pavement material, and X-axis is in figure
1.18-4.75mm dosage of gathering materials；Y-axis is that 0.075mm-1.18mm gathers materials dosage；Z axis is miberal powder dosage；It is trapezoidal shown in 1 in figure
Region is fines and miberal powder gradation meets specification or the region of project defined is embodied, and is uniformly taken in this area certain
The order of magnitude is tested with voidage measurement is carried out；In figure 2 be above-mentioned trapezoid area side endpoint and two trisection points.
Fig. 4 be Recycled Asphalt Pavement material in fines gradation select process voidage contour schematic diagram, 1,2,3,
4,5 be respectively 19%, 20%, 21%, 22%, 23% voidage contour, and dash area shown in 6 is voidage Minimum Area.
Fig. 5 is that fine aggregate gradation voidage of the present invention measures test method schematic diagram, and A is marshall compaction instrument
It hits actual load to set, B is to hold the fine aggregate gradation that pitch is not added in Marshall die trial, and C is supporting surface.
Specific embodiment
The Recycled Asphalt Pavement material of the guarantee cryogenic property is gathered materials using old material substitution part, is wrapped by mass
Include consisting of:
Limestone aggregates: 46.8%~70%；
Old material: 17.4%~46.8%；
Old material and gross mass of gathering materials: 87.4%~94.5%；
Miberal powder: 3.7%~7%；
Modified pitch or No. 70 matrix pitches 2.8%~6.1%.
Basic principle of the invention is according to fine aggregate gap and miberal powder content for the aobvious of bituminous concrete cryogenic property
Write the design for influencing to carry out the Recycled Asphalt Pavement of the guarantee cryogenic property based on cryogenic property by trigonometric coordinates method, material
Gathered materials with 4.75mm or less partial size for the compact structure of main packing material.
Its physical and chemical process is new pitch and the miscible regeneration for realizing aged asphalt of Bituminous concrete surface, asphalt adhesive fine aggregate shape
At compact structure, coarse aggregate plays certain pressure-bearing wherein.
The bituminous concrete that the present invention designs, under the premise of the old material substitution part using aging gathers materials, for thin collection
Expect that the optimization design of gradation can guarantee the superiority of material at low temperature performance；Old material quality is limited after thickness aggregate grading is selected
Guarantee that material property variation is smaller less than the i.e. controllable old material of aggregate quality；And high-temperature stability and water stability are excellent, old material
Utilization rate in the scope of application and intensity index, meets bituminous pavement design for highway specification (JTG D50- up to 40%
2017) performance requirement.
Below with reference to example is implemented, the present invention is further illustrated.
Example:
According to design method process design of the present invention Recycled Asphalt Pavement, and all using virgin material according to
One group of comparative test of AC20 median design, wherein AC20 is according to optimum oil-stone ratio 4.0%, and Recycled Asphalt Pavement is according to this hair
Each quality of materials accounting that the bright design of material method obtains is as follows.
Gather materials 56.8%；
Old material 35%；
No. 70 pitches 4.2%；
Miberal powder 4%；
Wherein gather materials as shown in the table with the gradation under old material standard mesh size:
From cryogenic property, high-temperature behavior, three aspect of water stability is by the Recycled Asphalt Pavement of the invention designed and by biography
The AC20 gradation virgin material concrete that system marshall' mechanic characteristic value obtains compares, specific as follows shown:
(1) cryogenic property is verified
According to " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2017), each gradation makes 9 girders, is
It is consistent volume index, -20 DEG C of low temperature the small beam experiments have been carried out, to compare cryogenic property.
After forming girder, hence it is evident that discovery, the voidage of AC20 gradation are greater than the new grade designed by design method of the present invention
Match, a little slag-off phenomenon occurs in AC20, and during forming girder, girder both ends are unstable, and some has had already appeared cracking.And
New gradation performance is very closely knit.The significant effect of preliminary identification control voidage, cohesive force is larger between particle.
- 20 DEG C of the small beam experiment Comparative results of two kinds of gradations are as shown in the table:
Energy to failure by the new gradation of design method of the present invention design is better than AC20 gradation, and flexural-tensile strain index meets
Require in JTG F40-2017 " standard specification for construction and acceptance of highway asphalt pavement ", at the same flexural tensile strength, flexural-tensile strain two indexes all compared with
It is good.Preferably, joined for old material ensure that modulus, enable mixture low temperature for the ess-strain performance of i.e. new gradation at low temperature
Bigger load is carried, while ensure that deformability is also larger compared with low porosity, i.e., anti-cracking performance is more preferable.Therefore, lead to
The new gradation of the design method is crossed, there is more reasonable voidage, make full use of and improve the low temperature of reclaimed asphalt mixture
Performance.
(2) high-temperature behavior is verified
The high-temperature behavior under 60 degree is tested according to " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2017), it is as follows
Table, it is found that high by the new gradation regeneration concrete of design method of the present invention design with respect to AC20 gradation virgin material concrete
Warm nature can increase, and improve 25% or so, this is the reason that old material is added, and whole compression strength be increased, although oily
For stone than bigger, gradation is partially thin, but dynamic stability is higher instead, has reached " standard specification for construction and acceptance of highway asphalt pavement " (JTG
F40-2017) twice of 1000 times desired/mm.
| Mix type | Test temperature/DEG C | Bitumen aggregate ratio/% | Dynamic stability (secondary/mm) |
| AC20 intermediate value virgin material, 4.0% bitumen aggregate ratio | 60 | 4 | 1619 |
| 35%RAP of the present invention, 4.3% bitumen aggregate ratio | 60 | 4.3 | 1987 |
(3) water stability is verified
It is evaluated using water stability of the immersion Marshall test to reclaimed asphalt mixture.In test, to each
Regenerating mixture gradation forms 8 marshal pieces, and measures the voidage of marshal piece, then according to voidage by big
8 test specimens are numbered to small sequence, number be odd number test specimen immersion 45min after carry out stability test, and number
Stability test is then carried out again after the 48h that soaks for the test specimen of even number.Specific test operation is according to " highway asphalt in test
With Asphalt Mixture Experiment regulation " technical requirements in (JTG E20-2011) execute, and test result is as shown in the table.
By the raising of the new gradation immersion residual stability ratio AC20 gradation bituminous concrete of design method of the present invention design
Close to 10%, immersion Marshall test residual stability index meets JTG F40-2017 " asphalt highway construction technology rule
Model " in require.New grade is demonstrated equipped with better water stability.Because the fine aggregate part of new gradation has been done after adjustment more
It is closely knit, and the increase of 4.75mm sieve pore percent of pass improves the water stability of regenerating mixture.
Based on the above results, the Recycled Asphalt Pavement of the present invention for ensureing cryogenic property, compared to AC20 gradation
For bituminous concrete, 35% old material is used, bitumen aggregate ratio increases 0.3%, but is that of obtaining better cryogenic property, together
When high-temperature stability and water stability it is all preferable, it was demonstrated that the validity of the design method.
Claims (8)
1. a kind of Recycled Asphalt Pavement material for ensureing cryogenic property, it is characterised in that: the guarantee cryogenic property is again
Raw asphalt concrete material is gathered materials using old material substitution part, by mass includes consisting of:
Limestone aggregates: 46.8%~70%；
Old material: 17.4%~46.8%；
Old material and gross mass of gathering materials: 87.4%~94.5%；
Miberal powder: 3.7%~7%；
Modified pitch or No. 70 matrix pitches 2.8%~6.1%.
2. a kind of Recycled Asphalt Pavement material for ensureing cryogenic property as described in claim 1, it is characterised in that: described
For the particle size range of limestone aggregates between 0.075mm~31.0mm, the limestone aggregates are the stone of different-grain diameter combination
Limestone gathers materials, and by 2 kinds in rubble, melon seeds piece, meter Zi and mountain flour or two or more is mixed；And more than 4.75mm partial size collect
Expect the 50%-55% of the total aggregate quality of quality Zhan.
3. a kind of Recycled Asphalt Pavement material for ensureing cryogenic property as described in claim 1, it is characterised in that: described
Old material combines from old pavement for different-grain diameter and digs the broken obtained asphalt of Xian.
4. a kind of design method of the Recycled Asphalt Pavement material as described in claim 1 for ensureing cryogenic property, feature
It is: method includes the following steps:
1) basic mechanics index of physics is carried out to modified pitch or No. 70 matrix pitch samples to test, specify Material Physics mechanics
Performance；
2) the fine aggregate grading limit expanded is selected；Significant 4.75mm partial size or less is influenced for cryogenic property to gather materials and mine
Powder gathers materials to miberal powder, 0.075~1.18mm partial size by trigonometric coordinates method, 1.18~4.75mm partial size gathers materials and selects multiple gradations
The voidage measurement test being designed, to draw voidage contour map, then close with voidage, miberal powder content and contour
Degree index determines the following aggregate grading of 4.75mm partial size；
3) coarse aggregate gradation, test 19mm partial size gather materials tamping forming after volumetric filling ratio, by stage filling principle design
The above aggregate grading of 4.75mm partial size；And under the premise of guaranteeing that old material dosage is less than aggregate quality, by design old material mixed ratio
Fixed coarse aggregate gradation mixes old material in the fine aggregate gradation and step 3) determined in example and step 2).
4) fracture of dynamic stability index and the measurement of low temperature the small beam experiment that asphalt content is measured by multiple wheel tracking test is selected
Energy index carries out the ratio choosing of asphalt content, and verifies whether to meet JTG F40-2017 " standard specification for construction and acceptance of highway asphalt pavement "
In failure strain index in dynamic stability index in wheel tracking test and low temperature bend test and immersion Marshall test are remained
The requirement of stability；It does not meet such as, again according to the selected grading limit expanded of step 2).
5. a kind of design method of Recycled Asphalt Pavement material for ensureing cryogenic property as claimed in claim 4, feature
Be: mechanics index of physics described in step 1) tests pointer penetration test, softening point test, 10 DEG C of ductility tests；It should meet
25 DEG C of needle penetrations are between 60~80, softening point >=45 DEG C, 10 DEG C of ductilities >=" the highway asphalt road 15cm and JTG F40-2017
Surface construction technical specification " in for No. 70 pitch related request.
6. a kind of design method of Recycled Asphalt Pavement material for ensureing cryogenic property as claimed in claim 4, feature
Be: the selected process of the grading limit expanded in step 2) is as follows, is expanded in specification AC grading limit, that is, presses certain AC gradation
1.18~4.75mm partial size, 0.075~1.18mm partial size, miberal powder 0.075mm three ranges of following partial size expand respectively, reduce
1.5 times obtain expanding grading limit bound.
7. a kind of design method of Recycled Asphalt Pavement material for ensureing cryogenic property as claimed in claim 4, feature
Be: step 2) carries out preferably fines gradation, and the fine aggregate of 4.75mm or less partial size is is divided by the trigonometric coordinates method used
1.18~4.75mm partial size, 0.075~1.18mm partial size, miberal powder 0.075mm three ranges of following partial size, in specification AC gradation model
It encloses and is expanded, define three coordinates of trigonometric coordinates are as follows: X-axis 1.18~4.75mm partial size aggregate content, Y-axis 0.075~
1.18mm partial size aggregate content, the following particle size content of Z axis miberal powder 0.075mm；By expand obtained grading limit draw 3 groups it is parallel
In each 2 straight lines of X, Y, Z axis, select folded trapezoidal in parallel lines；Three points are carried out on trapezoidal four edges, respectively take four
Point, then four side midpoint lines are taken, 5 intermediate benefit measuring points are added, 17 totally gradations carry out the gap referred in claim 4
Rate measurement test；Voidage contour map is drawn according to test result, first selection voidage Minimum Area, later in the region
The gradation for inside selecting miberal powder minimum is fine aggregate gradation.
8. a kind of design method of Recycled Asphalt Pavement material for ensureing cryogenic property as claimed in claim 4, feature
Be: step 2) carries out preferably fines gradation, and the voidage that uses measurement test fits over horse for the fines grade of pitch is not added and has a rest
It is struck 75 times in your container through marshall compaction instrument single side, real density is hit with mold height calculating；By measuring different-grain diameter collection
The apparent density of material is calculated the integral density of different gradation by integral density formula；By integral density and hits real density value and obtain sky
The test method of gap rate.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110330271A (en) * | 2019-07-09 | 2019-10-15 | 深圳市市政工程总公司 | Hot in-plant reclaimed asphalt mixture and its processing method |
| CN111122837A (en) * | 2019-12-19 | 2020-05-08 | 扬州大学 | Road performance evaluation method for plant-mixed hot recycled asphalt mixture |
| CN111548057A (en) * | 2020-06-08 | 2020-08-18 | 四川省公路规划勘察设计研究院有限公司 | Mix proportion design method of plant-mixed hot recycled asphalt mixture |
| CN113929358A (en) * | 2021-10-15 | 2022-01-14 | 东南大学 | Method for regenerating old asphalt pavement mixture based on epoxy resin system |
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