CN108646007A - A kind of Test model synthetic techniques of bituminous paving recycling old material conglomeration characteristic - Google Patents
A kind of Test model synthetic techniques of bituminous paving recycling old material conglomeration characteristic Download PDFInfo
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Abstract
The invention discloses the Test model synthetic techniques that a kind of bituminous paving recycles old material conglomeration characteristic.The present invention includes the following steps：Step A：It is prepared by testing material：Old material that sampling comes is placed in baking oven that drying to constant weight, it is spare after cooling；Step B：The calculating of elongated particles Q；Step C, extracting loss late L is calculated；Step D, the calculating of broken loss late S；Step E, the calculating of index of stability w；With the elongated particles Q in step B, the broken loss late S in extracting loss late L, step D in step C and the index of stability w in step E carry out the conglomeration degree and conglomeration stability of comprehensive analysis old material, compare the conglomeration otherness between different old materials.The conglomeration characteristic of energy effective evaluation bituminous paving recycling old material of the invention, and quantizating index is provided, and required testing equipment is conventional, easy to operate, experiment process is clear, and cost is relatively low, convenient for promoting the use of.
Description
Technical field：
The present invention relates to the Test model synthetic techniques that a kind of bituminous paving recycles old material conglomeration characteristic, belong to highway engineering pitch
Mixture performance detection technique field.
Background technology：
With the fast development of China's road construction, bituminous paving is with its surfacing, noise is small, seamless, driving are relaxed
It is suitable, build fast, simple and convenient for maintenance and accepted extensively by people, but bituminous paving is poor to the adaptability of temperature, high temperature or
It is all susceptible to pavement disease, and overhauling and rebuilding with the bituminous paving of early stage build when low temperature, produces a large amount of drip
Green road surface old material.
Waste asphalt mixture can not only occupy large amount of land resources, but also can cause environmental pollution and ecological disruption.It grinds
Study carefully and show that the property in addition to the ageing of asphalt of part, gathered materials in waste and old asphalt is held essentially constant, as non-renewable
The oil and building stones of resource, if being a kind of larger wasting of resources by old material of asphalt pavement waste treatment.And now bituminous paving
Regeneration techniques provide effective way for the disposition of waste asphalt mixture.Applied of Asphalt Pavement Recycle Technique generally can be according to construction field
The difference of ground, construction temperature etc. be divided into plant-mix heat recycle technology, hot in-place recycling technology, cold in-plant recycling technology and on the spot it is cold again
Raw technology etc..But these regenerations are faced with a universal problem, are exactly that old material volume is few, and utilization rate is low, reworked material
Energy variability is big, and pavement performance is unable to get sufficient guarantee.To find out its cause, being since there are larger variations for recycling old material
Property, wherein the conglomeration of old material significantly affects the grading variability and pavement performance of regenerating mixture.
Correlative study shows that the old material conglomeration situation of separate sources is widely different, the degree of aging on former road surface, material group
It can all influence to recycle old material at many factors such as, grading characteristic and milling equipment, milling temperature, pavement humidity, road surface positions
Conglomeration situation, conglomeration old material will seriously affect the performance of regenerating mixture, reduce the utilization of old material such as without fully broken
Rate.Therefore, it is the conglomeration degree for fully reducing old material, improves reclamation of old material utilization rate, improves reworked material pavement performance, it is necessary to
The Disposal Measures etc. of the conglomeration situation of old material, the breakage properties of old material, old material conglomeration are adequately studied.
Invention content
The object of the present invention is to provide the Test model synthetic techniques that a kind of bituminous paving recycles old material conglomeration characteristic, by old
Material carries out sieve test, the experiment of flat-elongated particles content, stepping extraction test and Los Angeles abrasion instrument crushing test, with old material needle
The evaluation index of sheet content Q and stepping extracting loss late L as old material conglomeration degree, loss late S and stabilization are crushed with old material
Evaluation indexes of the index w as old material conglomeration stability, the conglomeration characteristic of comprehensive analysis old material.This evaluation method can be commented effectively
Valence bituminous paving recycles the conglomeration characteristic of old material, and provides quantizating index, and required testing equipment is conventional, easy to operate, experiment
Process is clear, and cost is relatively low, convenient for promoting the use of.
Above-mentioned purpose is achieved through the following technical solutions：
A kind of Test model synthetic techniques of bituminous paving recycling old material conglomeration characteristic, this method comprises the following steps：
Step A：It is prepared by testing material：Old material that sampling comes is placed in baking oven that drying to constant weight, it is spare after cooling；
Step B：The calculating of elongated particles Q；
Step C, extracting loss late L is calculated；
Step D, the calculating of broken loss late S；
Step E, the calculating of index of stability w；
With the elongated particles Q in step B, the broken loss late S and step in extracting loss late L, step D in step C
Index of stability w in rapid E carrys out the conglomeration degree and conglomeration stability of comprehensive analysis old material, compares the conglomeration difference between different old materials
Property.
The Test model synthetic techniques of the bituminous paving recycling old material conglomeration characteristic, the elongated particles Q described in step B
Computational methods be：4.75mm standard screens are crossed to old material in step A, take upper three parts, every part of 2000g of the product of sieve, and measure every part
The elongated particles Q of old material, the preliminary analysis index as old material conglomeration degree.
The Test model synthetic techniques of the bituminous paving recycling old material conglomeration characteristic, the extracting loss late L described in step C
Calculating includes the following steps：
Step C1, using 26.5mm, 19mm, 16mm, 13.2mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm,
The standard screen of 0.3mm, 0.15mm, 0.075mm to the drying old material in step A sieve by shelves；
Step C2, each each 1000~1500g of shelves old material after being sieved in step C1 is weighed respectively, to every grade of grain size old material point
It is not stripped experiment；
Step C3, to gathering materials obtained by each shelves old material extraction test in step C2, drying to constant weight, after cooling down and weighing, point
Not Cai Yong the standard screen that gathers materials of foramen primum diameter sieved again, calculate the grader retained percentage of each sieve, and draw out each shelves grain
Grader retained percentage variation diagram after the extracting of diameter old material, carries out each grain size old material particle composition analysis；
Step C4, according to each shelves old material grader retained percentage in step C3 as a result, calculating the extracting damage of every grade of old material
Mistake rate Li, as the evaluation index of each shelves old material conglomeration situation,
Extract loss late LiIt is calculated by formula (1)：
Li=(1-ai) × 100% (1)
Wherein：Li-- i-th grade of grain size old material extracts loss late；ai-- the i-th grain size grader retained percentage after extracting,
LiShow that the conglomeration situation of this grade of old material is more serious more greatly, and using screen size as abscissa, it is old with each shelves grain size
The extracting loss late of material is ordinate, draws out figure of changing of each shelves old material conglomeration degree size with grain size.
The Test model synthetic techniques of the bituminous paving recycling old material conglomeration characteristic, the broken loss late S described in step D
Calculating include the following steps：
Step D1：The thick old material of each shelves sifted out in step C1 is weighed, the thick old material referred to >=4.75mm standard sets
Upper remaining old material is sieved after material screen, four parts every grade, every part of quality is 2000g, is carried out under the thick old material room temperature of each shelves, the Lip river of different revolutions
China fir rock abrasion instrument crushing test, is not added with steel ball, and revolution selects 50r/min, 100r/min, 200r/min, 300r/min respectively；
Step D2：To broken i-th grade of old material in step D1, is sieved with i-th grade of grain size after taking-up, weigh this
Remaining old material quality, calculates the broken loss late S of the grain size old material on sievei, calculated by formula (2)：And draw out each grain
Diameter old material is crushed loss late with the increased variation relation figure of Los Angeles abrasion instrument revolution,
Wherein：Si- the i-th grade of grain size old material is crushed loss late；m1i-- it is crushed the old material quality of preceding i-th grade of grain size；m2i-- it is broken
The upper remaining old material quality of i-th grade of sieve after broken.
The bituminous paving recycles the Test model synthetic techniques of old material conglomeration characteristic, the index of stability w's described in step E
Computational methods are：According to the broken loss late S of each shelves grain size old material in step DiAnd the extracting of each shelves old material is damaged in step C
Mistake rate Li, index of stability w is calculated, as the overall stability evaluation index of thick old material conglomeration, and draws out index of stability with broken
The broken increased variation relation figure of revolution；Index of stability w is calculated by formula (3)：
Wherein：W-index of stability；N -4.75mm and the above coarse aggregate grain size gear number；Li- the i-th grade of coarse fodder extracting loss
Rate； Si- the i-th grade of coarse fodder is crushed loss late.
Advantageous effect：
The present invention carries out sieve test, the experiment of flat-elongated particles content, stepping successively by recycling old material to bituminous paving
After extraction test and Los Angeles abrasion instrument crushing test, loss late L is extracted as old material knot using old material elongated particles Q and stepping
The evaluation index of group's degree is crushed loss late S and index of stability w as the evaluation index of old material conglomeration stability using old material, comprehensive
Close the conglomeration characteristic of analysis old material.The conglomeration characteristic of energy effective evaluation bituminous paving recycling old material of the invention, and provide quantization and comment
Valence index, process of refinement and raising recycling asphalt mixtures performance to old material are of great significance.In addition, the present invention
Testing equipment needed for evaluation method is conventional, easy to operate, and experiment process is clear, and cost is relatively low, convenient for promoting the use of.
Description of the drawings
Fig. 1：The Test model synthetic techniques flow chart of bituminous paving recycling old material conglomeration characteristic according to the invention；
Fig. 2：Old material one and the grader retained percentage variation diagram after each shelves grain size old material extracting in old material two；Wherein Fig. 2
(a) be 2.36mm grain size old materials extracting after grader retained percentage variation diagram；Fig. 2 (b) is after 4.75mm grain size old materials extract
Grader retained percentage variation diagram；Fig. 2 (c) is the grader retained percentage variation diagram after the extracting of 9.5mm grain size old materials；Fig. 2
(d) be 13.2mm grain size old materials extracting after grader retained percentage variation diagram；Fig. 2 (e) is after 16mm grain size old materials extract
Grader retained percentage variation diagram；Fig. 2 (f) is the grader retained percentage variation diagram after the extracting of 19mm grain size old materials.
Fig. 3：Old material one extracts loss late variation diagram with each shelves grain size old material in old material two；
Fig. 4：Each shelves old material is crushed loss late with revolution variation diagram in old material one；
Fig. 5：Each shelves old material is crushed loss late with revolution variation diagram in old material two；
Fig. 6：The index of stability of old material one and old material two is with broken revolution variation diagram.
Specific implementation mode
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific implementation modes are only used for
It is bright the present invention rather than limit the scope of the invention.
For a better understanding of the present invention, below in conjunction with specific embodiment and attached drawing, the present invention will be further described, but
Present disclosure is not only limited to the following examples.
A kind of Test model synthetic techniques of bituminous paving recycling old material conglomeration characteristic provided by the invention, specific test procedure is such as
Under：
Step A：According to《Asphalt highway regeneration techniques specification》It, will after the sampling method sampling that (JTG F41) recommends
Old material is placed in 60 DEG C of baking ovens that drying to constant weight, spare after cooling.
Step B：To three parts, every part of 2000g of 4.75mm standard screens scalping (>=4.75mm) of old material in step A, and
It presses《Highway engineering is gathered materials testing regulations》T0312 methods measure the elongated particles Q of every part of old material in (JTG E42), as old
Expect the preliminary analysis index of conglomeration degree.
Step C：Using standard screen, press《Highway engineering is gathered materials testing regulations》The test method of (JTG E42) T0327 is to step
Drying old material in rapid A using 26.5mm, 19mm, 16mm, 13.2mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm,
The standard screen of 0.3mm, 0.15mm, 0.075mm sieved by shelves.
Step D：Weigh respectively in 1000~1500g steps C sieve after each shelves old material (4.75mm or less is removed the limit,
4.75mm or more cappings), it presses《Highway engineering pitch and Asphalt Mixture Experiment regulation》(JTG E20-2011) T0722's
Test method is stripped experiment respectively to every grade of grain size old material.
Step E：To gathering materials obtained by each shelves old material extraction test in step D, drying to constant weight, after cooling down and weighing, respectively
It presses《Highway engineering is gathered materials testing regulations》The test method of (JTG E42) T0327 is sieved again, calculates point meter sieve of each sieve
Remaining percentage, and grader retained percentage variation diagram after each shelves grain size old material extracting is drawn out, carry out each grain size old material particle group
At analysis.
Step F：According to each shelves old material grader retained percentage in step E as a result, calculating the extracting loss of every grade of old material
Rate Li, as the evaluation index of each shelves old material conglomeration situation, LiShow that the conglomeration situation of this grade of old material is more serious more greatly.And with sieve
Pore size is abscissa, using the extracting loss late of each shelves grain size old material as ordinate, draws out each shelves old material conglomeration degree size
With the figure of changing of grain size.
Step G：Weigh the thick old material of each shelves (>=4.75mm) sifted out in step C, four parts every grade, every part of quality is
2000g disperses broken method to each shelves old material progress crushing test, specific requirement reference using Los Angeles abrasion instrument《Highway
Engineering pitch and Asphalt Mixture Experiment regulation》The test method of (JTG E20-2011) T0733 carries out room temperature to each shelves old material
Under dispersion test, Los Angeles abrasion instrument is respectively set as 50 turns, 100 turns, 200 turns, 300 turns.
Step H：To broken i-th grade of old material in step G, is sieved with i-th grade of grain size after taking-up, weigh the sieve
Upper residue old material quality, calculates the broken loss late S of the grain size old materiali.And it draws out each grain size old material and is crushed loss late with Lip river
The increased variation relation figure of China fir rock abrasion instrument revolution.
Step I：According to the broken loss late S of each shelves grain size old material in step HiAnd in step D each shelves old material extracting
Loss late Li, calculate index of stability w, as the overall stability evaluation index of thick old material conglomeration, and draw out index of stability with
The increased variation relation figure of broken revolution.Wherein, index of stability is bigger, and the conglomeration stability of old material is higher.
Step J：With the elongated particles Q in step B, the broken loss late in extracting loss late L, step H in step F
Index of stability w in S and step I carrys out the conglomeration degree and conglomeration stability of comprehensive analysis old material, compares the knot between different old materials
Group's otherness.
Flat-elongated particles assay is the thick old material for being directed to 4.75mm or more, elongated particles in the step B
Higher, old material conglomeration degree is more serious, and preliminary delimitation standard is：Slightly (≤15%), moderate (15%~30%), severe
(30%~50%), extremely heavy (>=50%).
Extracting loss late in the step F is the evaluation index for each grain size old material conglomeration degree size, extracting damage
Mistake rate is bigger, and conglomeration is more serious.It is calculated by formula (1)：
Li=(1-ai) × 100% (1)
Wherein：Li-- i-th grade of grain size old material extracts loss late；ai-- the i-th grain size grader retained percentage after extracting.
Broken loss late in the step H is for the single grain size old material conglomeration stability sizes of 4.75mm or more
Evaluation index, broken loss late is bigger, and conglomeration stability is poorer, is calculated by formula (2)：
Wherein：Si- the i-th grade of grain size old material is crushed loss late；m1i-- it is crushed the old material quality of preceding i-th grade of grain size；m2i-- it is broken
The upper remaining old material quality of i-th grade of sieve after broken.
Index of stability in the step I is to be directed to 4.75mm and the evaluation of the above grain size old material overall stability refers to
Mark, index of stability is bigger, and the overall stability of old material conglomeration is higher, is calculated by formula (3)：
Wherein：W-index of stability；N -4.75mm and the above coarse aggregate grain size gear number；Li- the i-th grade of coarse fodder extracting loss
Rate；Si- the i-th grade of coarse fodder is crushed loss late.
Elongated particles are the preliminary analysis of old material conglomeration degree in the step J, and extracting loss late is old material conglomeration journey
The further analysis of degree；Broken loss late is single grain size conglomeration stability analysis, and index of stability is global stability analysis；Knot
Close four kinds of indexs can overall merit bituminous paving recycling old material conglomeration characteristic, compare conglomeration otherness between different old materials.
Example 1：
A kind of Test model synthetic techniques of bituminous paving recycling old material conglomeration characteristic, such as Fig. 1, with AC20 asphalt roads in this example
Face milling material (old material one) and its secondary broken material (old material two) are raw material, carry out the evaluation of conglomeration characteristic, detailed process
It is as follows：
1. old material sampling, screening and flat-elongated particles assay
According to《Asphalt highway regeneration techniques specification》It, will after the sampling method that (JTG F41) recommends takes two kinds of old materials
It is placed in 60 DEG C of baking ovens that drying to constant weight, spare after cooling.First, two kinds of old material 4.75mm standard screens of the amount of taking fully respectively
Three parts, every part of 2000g of scalping (>=4.75mm), and press《Highway engineering is gathered materials testing regulations》T0312 in (JTG E42)
Method measures the elongated particles Q of every part of old material, as the preliminary analysis index of old material conglomeration degree, as a result such as table 1.Then,
It resamples, using standard screen, presses《Highway engineering is gathered materials testing regulations》Two kinds of the test method pair of (JTG E42) T0327 is old
Material sieved by shelves, spare.
1 two kinds of old material flat-elongated particles content situations of table
| Number | 1 | 2 | 3 | Mean value |
| Old material one | 43.15% | 45.27% | 43.75% | 44.06% |
| Old material two | 35.06% | 32.08% | 33.56% | 33.57% |
| Conglomeration degree | Gently | In | Weight | It is extremely heavy |
| Section | ≤ 15% | 15%~30% | 30%~50% | >=50% |
2. stepping extraction test
Weighing each shelves old material after 1000~1500g, two kinds of screenings respectively, (4.75mm or less is removed the limit, and 4.75mm or more takes
The upper limit), it presses《Highway engineering pitch and Asphalt Mixture Experiment regulation》The test method of (JTG E20-2011) T0722, to every
Shelves grain size old material is stripped experiment respectively.To gathering materials obtained by each shelves old material extraction test, drying to constant weight, and cooling is simultaneously weighed
Afterwards, it presses respectively《Highway engineering is gathered materials testing regulations》The test method of (JTG E42) T0327 is sieved again, calculates each sieve
Grader retained percentage, and draw out grader retained percentage variation diagram, such as Fig. 2 after the extracting of each shelves grain size old material.
3. calculating each shelves old material extracts loss late
According to each shelves old material grader retained percentage after stepping extraction test as a result, by formula (1) every grade of old material of calculating
Extract loss late Li, LiShow that the conglomeration situation of this grade of old material is more serious more greatly.And using screen size as abscissa, with each shelves grain
The extracting loss late of diameter old material is ordinate, draws out figure of changing of each shelves old material conglomeration degree size with grain size, is such as schemed
3。
Li=(1-ai) × 100% (1)
Wherein：Li-- i-th grade of grain size old material extracts loss late；ai-- the i-th grain size grader retained percentage after extracting.
The crushing test 4. Los Angeles abrasion instrument disperses
Weigh the thick old material of each shelves (>=4.75mm) for the two kinds of old materials sifted out in 1, four parts every grade, every part of quality is
2000g disperses broken method to each shelves old material progress crushing test, specific requirement reference using Los Angeles abrasion instrument《Highway
Engineering pitch and Asphalt Mixture Experiment regulation》The test method of (JTG E20-2011) T0733 carries out room temperature to each shelves old material
Under dispersion test, Los Angeles abrasion instrument is respectively set as 50 turns, 100 turns, 200 turns, 300 turns.
5. calculating each shelves old material is crushed loss late
It to broken i-th grade of old material, is sieved with i-th grade of grain size after taking-up, weighs remaining old material matter on the sieve
Amount, the broken loss late S of the grain size old material is calculated by formula (2)i, and draw out each grain size old material and be crushed loss late with Los Angeles
The increased variation relation figure of abrasion instrument revolution, such as Fig. 4 and Fig. 5.
Wherein：Si- the i-th grade of grain size old material is crushed loss late；m1i-- it is crushed the old material quality of preceding i-th grade of grain size；m2i-- it is broken
The upper remaining old material quality of i-th grade of sieve after broken.
6. calculating index of stability
According to the broken loss late S of each shelves grain size old material in 5iAnd in 3 each shelves old material extracting loss late Li, by formula
(3) index of stability w is calculated, as the overall stability evaluation index of thick old material conglomeration, and index of stability is drawn out and turns with broken
The increased variation relation figure of number, such as Fig. 6.Wherein, index of stability is bigger, and the conglomeration stability of old material is higher.
Wherein：W-index of stability；N -4.75mm and the above coarse aggregate grain size gear number；Li- the i-th grade of coarse fodder extracting loss
Rate；Si- the i-th grade of coarse fodder is crushed loss late.
7. comparison of test results is analyzed
Old material conglomeration degree is evaluated with elongated particles Q and extracting loss late L, is commented with broken loss late S and index of stability w
Valence old material conglomeration stability, comprehensive four indices are as it can be seen that old material one is compared to two conglomeration degree bigger of old material, and conglomeration stability is more
Difference, also indicating that factory's second-time breakage to a certain extent helps to reduce the conglomeration degree of old material.
To sum up, the invention discloses the Test model synthetic techniques that a kind of bituminous paving recycles old material conglomeration characteristic.By to drip
Green road surface recycling old material carries out sieve test, the experiment of flat-elongated particles content, stepping extraction test and Los Angeles abrasion instrument successively
After crushing test, loss late L is extracted as the evaluation index of old material conglomeration degree, with old using old material elongated particles Q and stepping
Material is crushed the evaluation index of loss late S and index of stability w as old material conglomeration stability, and energy effective evaluation bituminous paving recycling is old
The conglomeration characteristic of material, and testing equipment needed for evaluation method is conventional, and easy to operate, experiment process is clear, and cost is relatively low, is convenient for
It promotes the use of.
Embodiment described above is the preferred embodiment of the present invention, is merely to illustrate the present invention, not for limitation
The present invention, the present invention it is not limited to this, it is noted that the present invention for those skilled in the art, not
Under the premise of being detached from the technology of the present invention principle, several improvements and modifications can also be made, these improvements and modifications also fall into this hair
In bright scope of the claims.
Claims (5)
1. a kind of Test model synthetic techniques of bituminous paving recycling old material conglomeration characteristic, which is characterized in that this method includes following step
Suddenly：
Step A：It is prepared by testing material：Old material that sampling comes is placed in baking oven that drying to constant weight, it is spare after cooling；
Step B：The calculating of elongated particles Q；
Step C, extracting loss late L is calculated；
Step D, the calculating of broken loss late S；
Step E, the calculating of index of stability w；
With the elongated particles Q in step B, in the broken loss late S in extracting loss late L, step D and step E in step C
Index of stability w come the conglomeration degree and conglomeration stability of comprehensive analysis old material, compare the conglomeration otherness between different old materials.
2. the Test model synthetic techniques of bituminous paving recycling old material conglomeration characteristic according to claim 1, which is characterized in that step
Suddenly the computational methods of the elongated particles Q described in B are：4.75mm standard screens are crossed to old material in step A, take sieve above product three
Part, every part of 2000g, and the elongated particles Q of every part of old material is measured, the preliminary analysis index as old material conglomeration degree.
3. the Test model synthetic techniques of bituminous paving recycling old material conglomeration characteristic according to claim 1, which is characterized in that step
Extracting loss late L calculating described in rapid C includes the following steps：
Step C1, using 26.5mm, 19mm, 16mm, 13.2mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm,
The standard screen of 0.3mm, 0.15mm, 0.075mm to the drying old material in step A sieve by shelves；
Step C2, weigh respectively in step C1 sieve after each each 1000~1500g of shelves old material, to every grade of grain size old material respectively into
Row extraction test；
Step C3, to gathering materials obtained by each shelves old material extraction test in step C2, drying to constant weight, after cooling down and weighing, adopts respectively
It is sieved again with the standard screen that gathers materials of foramen primum diameter, calculates the grader retained percentage of each sieve, and it is old to draw out each shelves grain size
Grader retained percentage variation diagram after material extracting, carries out each grain size old material particle composition analysis；
Step C4, according to each shelves old material grader retained percentage in step C3 as a result, calculating the extracting loss late of every grade of old material
Li, as the evaluation index of each shelves old material conglomeration situation,
Extract loss late LiIt is calculated by formula (1)：
Li=(1-ai) × 100% (1)
Wherein：Li-- i-th grade of grain size old material extracts loss late；ai-- the i-th grain size grader retained percentage after extracting,
LiShow that the conglomeration situation of this grade of old material is more serious more greatly, and using screen size as abscissa, with the pumping of each shelves grain size old material
It is ordinate to put forward loss late, draws out figure of changing of each shelves old material conglomeration degree size with grain size.
4. the Test model synthetic techniques of bituminous paving recycling old material conglomeration characteristic according to claim 3, which is characterized in that step
The calculating of broken loss late S described in rapid D includes the following steps：
Step D1：The thick old material of each shelves sifted out in step C1 is weighed, the thick old material referred to >=4.75mm standard set material screens
The upper remaining old material of sieve afterwards, four parts every grade, every part of quality is 2000g, is carried out under the thick old material room temperature of each shelves, Los Angeles of different revolutions
Abrasion instrument crushing test, is not added with steel ball, and revolution selects 50r/min, 100r/min, 200r/min, 300r/min respectively；
Step D2：To broken i-th grade of old material in step D1, is sieved, weighed on the sieve with i-th grade of grain size after taking-up
Remaining old material quality calculates the broken loss late S of the grain size old materiali, calculated, be averaged by formula (2)：And it draws out
Each grain size old material is crushed loss late with the increased variation relation figure of Los Angeles abrasion instrument revolution,
Wherein：Si- the i-th grade of grain size old material is crushed loss late；m1i-- it is crushed the old material quality of preceding i-th grade of grain size；m2i-- after broken
The upper remaining old material quality of i-th grade of sieve.
5. the Test model synthetic techniques of bituminous paving recycling old material conglomeration characteristic according to claim 3, which is characterized in that step
Suddenly the computational methods of the index of stability w described in E are：According to the broken loss late S of each shelves grain size old material in step Di, Yi Jibu
The extracting loss late L of each shelves old material in rapid Ci, index of stability w is calculated, as the overall stability evaluation index of thick old material conglomeration,
And index of stability is drawn out with the increased variation relation figure of broken revolution；Index of stability w is calculated by formula (3)：
Wherein：W-index of stability；N -4.75mm and the above coarse aggregate grain size gear number；Li- the i-th grade of coarse fodder extracts loss late；
Si- the i-th grade of coarse fodder is crushed loss late.
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