CN106950358A - A kind of method for determining cold regeneration mix optimum emulsification asphalt content OEC - Google Patents
A kind of method for determining cold regeneration mix optimum emulsification asphalt content OEC Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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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
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
Optimum moisture content OWC is determined the present invention relates to a kind of method for determining cold regeneration mix optimum emulsification asphalt content OEC, including (1)；(2) cold regeneration mix of multigroup different emulsified asphalt volumes is formed；(3) marshal piece preparation is carried out to multigroup cold regeneration mix, and carries out test specimen health and hit reality；(4) test specimen by step (3) is tested, determines optimum emulsification asphalt content OEC, wherein：In step (1), it is determined that after optimum moisture content OWC, calculating emulsified asphalt and outer water mixing weight sum, and determine that emulsified asphalt and outer water mixing weight sum are invariant A；In step (2), the emulsified asphalt and outer water mixing sum of each group cold regeneration mix is kept to be the invariant A, change emulsified asphalt volume and outer water mixing volume.The present invention compared with the conventional method, both reduces error, human and material resources and financial resources is saved again, and the inventive method has the characteristics of reproducibility is strong, suitable for being widely popularized.
Description
Technical field
The invention belongs to pavement material regeneration field, and in particular to the cold recycled asphalt mixture of field of road is optimal
Asphalt emulsion content OEC determination method.
Background technology
Method is determined for the emulsified asphalt optimum amount of cold recycled asphalt mixture, at present essentially according to specification《Highway
Applied of Asphalt Pavement Recycle Technique specification》(JTG F41-2008) is implemented.It is briefly described as follows：The first step, determines optimum moisture content
OWC, method is：Based on experience value, setting emulsified asphalt experiment consumption is set to 3%, and stepped change moisture content contains to each group difference
Water rate cold regeneration mix carries out compaction test, each group test specimen dry density is tested, according to the relation between moisture content and dry density
Curve, when determining maximum dry density, corresponding moisture content is referred to as optimum moisture content OWC；Second step, based on optimum moisture content OWC,
Moisture content is set as optimum moisture content OWC, using the Asphalt emulsion content obtained by experience as intermediate value, 5 groups of stepped change emulsifications are formed
The cold regeneration mix of pitch volume, prepares test specimen in accordance with the following steps：
1. enough mixs are added into mixing machine uniformly containing the compound for reclaiming asphalt pavement material (RAP) to gather materials；
2. the amount of water obtained according to calculating adds water, mix is uniform, and duration of mixing is generally 1min；
3. the emulsified asphalt amount according to calculating adds emulsified asphalt, mix is uniform, and duration of mixing is generally 1min；
4. the uniform compound of mix is loaded into die trial, it is put on marshall compaction instrument, it is two-sided respectively to hit real 100 times；
5. sample is placed in 60 DEG C of convection oven together with die trial side, health is to constant weight, and conditioned time is typically many
In 40h；
After 6. health terminates, respectively hit real 50 times by sample is two-sided immediately, then side, which is placed on, cool down at room temperature at least 12h；
7. wax coating method tests the bulk specific gravity γ f of test specimen, vacuum method surveys the most Dali of each group regenerating mixture
By relative density γ t, by each group bitumen aggregate ratio test specimen carry out voidage VV calculating, 15 DEG C of diametral compression tests, freeze-thaw split TSR experiments,
60 DEG C of unconfined compression strength tests (needing other sample preparation)；
8. according to above-mentioned result of the test, incorporation engineering experience determines optimum emulsification asphalt content OEC, and according to existing《It is public
Road engineering pitch and Asphalt Mixture Experiment code》There is the checking of the test methods of (JTG 052) T 0719 optimum emulsification pitch to use
Measure the dynamic stability of OEC cold regeneration mix.
The advantage of above-mentioned specification is：It is determined that during emulsified asphalt optimum amount OEC, keeping moisture content most preferably to contain
Water rate OWC is constant, and conversion forms 5 Asphalt emulsion contents, each group cold regeneration mix in addition to Asphalt absorption is different, its
Remaining each component ratio completes identical, and affecting laws of the bitumen content single factors to mixture performance are studied by this kind of mode,
And then obtain emulsified asphalt optimum amount OEC.But there is also deficiency for this method：It is determined that during optimal OEC, although aqueous
Rate is that OWC is constant, big with the change of emulsified asphalt volume, but is for the emulsified asphalt and outer water mixing sum of liquid under environment temperature
Gradually increase, with the increase of emulsified asphalt and outer water mixing sum during mixing and stirring, the adhesion of compound and mix pot wall
Degree is entirely different, shows as emulsified asphalt and the larger cold regeneration mix of outer water mixing sum, and it sticks to mix pot wall
In slurry at most, test error is bigger, influence optimum emulsification asphalt content OEC determination.
Method for determining emulsified asphalt optimum amount OEC as defined in specification, research staff is improved.Patent
CN102765902A discloses a kind of compound method of Cold Recycled Mixture with Emulsified Asphalt, in the method, by circulating authentication
Formula determines emulsified asphalt optimum amount, and compared with method as defined in specification JTG 052, this method is more reasonable, disclosure satisfy that reality
Border requirement of engineering.Patent CN104402316B discloses a kind of mixing proportion design method of Cold Recycled Mixture with Emulsified Asphalt, energy
Enough during mix-design, Cold Recycled Mixture with Emulsified Asphalt properties are effectively improved, in early stage mix-design rank
Section can be optimized performance and meet desired scheme, substantially reduce the risk of the various pavement diseases of Experiment Road making stage appearance.
But all there is emulsified asphalt, gather materials and other component mix mistakes in above-mentioned emulsified asphalt optimum amount OEC determination modes
Inevitable error in journey.Error one：During mix, emulsified asphalt and outer water mixing are present with flow regime, plus
It can freely flow, and be inevitably partly adhered in mix pot after entering, cause a certain degree of error, it is conventional effective
Way for moistening processing can be carried out by advance to mix pot, reduce this kind of error, but when emulsified asphalt volume is higher,
Error is still larger；Error two：Under conditions of moisture content is optimum moisture content OWC, scaling transformation consumption, with emulsified asphalt
The increase of mixed ratio, the emulsified asphalt of compound and outer water mixing sum are in incremental state, due to the breast of flow regime is presented
Change pitch different with outer water mixing sum, the damage of emulsified asphalt and water of the compound during mix caused by adhesion certainly will be caused
Lose different, ordinary circumstance is that the total amount of emulsified asphalt and outer water mixing is higher, adhesion it is more；It is observed that emulsification in experiment
When pitch and larger outer water mixing sum, or under the optimum moisture content and optimum emulsification asphalt content of remote super experience both
During sum, the apparent status display of compound is wall adhesion situation aggravation in hypervolia, mix pot, and drip is emulsified during mixing and stirring
Blue or green and outer water mixing loss is larger, and the actual emulsified asphalt volume and moisture content in experiment test specimen have larger error with actual value,
The final determination of optimum emulsification asphalt content is directly affected, experiment shows, this kind of error can cause optimum emulsification asphalt content OEC
Value is higher, is both unfavorable for engineering construction, causes construction costs to improve again.
The content of the invention
The technical problems to be solved by the invention overcome the deficiencies in the prior art there is provided one kind it is convenient accurately determine it is cold again
Raw mix optimum emulsification asphalt content OEC method.
To solve above technical problem, the present invention is adopted the following technical scheme that：
A kind of method for determining cold regeneration mix optimum emulsification asphalt content OEC, including (1) determine optimum moisture content
OWC；(2) cold regeneration mix of multigroup different emulsified asphalt volumes is formed；(3) horse is carried out to multigroup cold regeneration mix
Xie Er test material preparations, and carry out test specimen health and hit reality；(4) test specimen by step (3) is tested, determines optimum emulsification
Asphalt content OEC, wherein：In step (1), it is determined that after optimum moisture content OWC, calculate emulsified asphalt and outer water mixing weight it
With, and determine that emulsified asphalt and outer water mixing weight sum are invariant A；In step (2), each group cold regeneration mix is kept
Emulsified asphalt and outer water mixing sum are the invariant A, change emulsified asphalt volume and outer water mixing volume.
Preferably, in step (2), at least 5 groups cold regeneration mixes are formed.
Preferably, in step (2), emulsified asphalt content changes in single-candidate in multigroup cold regeneration mix.According to one
In individual specific preferred aspect, step (2), the single-candidate changing value is 1%.
According to one of the present invention specific and preferred aspect, in step (2), 5 groups of cold regeneration mixes are formed, this 5 groups cold
The emulsified asphalt content of regenerating mixture is respectively 1%, 2%, 3%, 4% and 5%.
Further：In step (4), the experiment includes that freeze-thaw split TSR is tested, 15 DEG C of diametral compression tests, 60 DEG C without side
Limit compressive strength test.
According to the present invention, step (1), step (3), step (4) can be according to specifications《Asphalt highway regeneration techniques
Specification》(JTG F41-2008) is implemented.
Further, methods described also includes step (5)：Contain according to the optimum emulsification asphalt content OEC of determination and most preferably
Water rate OWC, according to existing《Highway engineering pitch and Asphalt Mixture Experiment code》The methods of (JTJ 052) T 0719 carry out pitch
Compound wheel tracking test verifies that wheel tracking test is qualified, obtains optimum emulsification asphalt content OEC.
Due to taking above technical scheme, the present invention has the following advantages that compared with prior art：
The optimum emulsification asphalt content OEC that the present invention is provided determines method, by outer water mixing during calculating optimum moisture content OWC
It is set as invariant with emulsified asphalt volume sum, as the follow-up prerequisite carried out in OEC determination process, reduces experiment
During, due to the difference of both liquid sums of emulsified asphalt and outer water mixing in compound, the compound caused is being mixed
The degree of adhesion closed on pot wall is different, both reduces error, human and material resources and financial resources are saved again, optimize it is current it is cold again
Raw asphalt optimum emulsification asphalt content OEC determination method, and the present invention method that provides has reproducibility strong
Feature, suitable for being widely popularized.
Brief description of the drawings
The determination method and step flow chart for the optimum emulsification asphalt content OEC that Fig. 1 present invention is provided；
Fig. 2 is embodiment cold regeneration mix voidage and bitumen aggregate ratio graph of relation；
Fig. 3 is 15 DEG C of cleavage strengths of embodiment cold regeneration mix and bitumen aggregate ratio graph of relation；
Fig. 4 is embodiment cold regeneration mix TSR and bitumen aggregate ratio graph of relation；
Fig. 5 is 60 DEG C of unconfined compressive strengths of embodiment cold regeneration mix and bitumen aggregate ratio graph of relation.
Embodiment
As shown in figure 1, the method for the determination cold regeneration mix optimum emulsification asphalt content OEC that the present invention takes is as follows：
Step (1)：Optimum moisture content OWC is obtained according to method as defined in specification, now emulsified asphalt and outer water mixing is set
Weight sum is invariant A；
Step (2)：Keep emulsified asphalt and outer water mixing sum A constant, change emulsified asphalt content is 1%, 2%, 3%,
4%th, 5%, the cold regeneration mix of 5 groups of different emulsified asphalt volumes is formed, corresponding outer watering quantity subtracts newborn in each group for A
Change pitch volume；
Step (3)：According to method as defined in specification, 5 groups of compounds carry out marshal piece preparation to more than, and according to rule
Model requirement, carries out test specimen health and secondary hits reality；
Step (4)：Voidage, freeze-thaw split TSR experiments, 15 DEG C of diametral compression tests, 60 DEG C of nothings are carried out to above-mentioned 5 groups of compounds
Confined compression strength test (needs other sample preparation), determines optimum emulsification asphalt content OEC；
Step (5)：According to the optimum emulsification asphalt content OEC and optimum moisture content OWC of determination, according to existing《Highway work
Journey pitch and Asphalt Mixture Experiment code》The methods of (JTJ 052) T 0719 carry out asphalt mixture in track test checking, rut
Pass the test, obtains optimum emulsification asphalt content OEC.
Below in conjunction with specific embodiment, the present invention will be further described in detail, but implements the invention is not restricted to following
Example.Unless otherwise indicated, the percentage that content is represented herein is weight or mass percent.Unreceipted experiment condition is normal
The experiment condition of rule.
Embodiment
Cold recycled asphalt mixture emulsified asphalt optimum amount OEC determination method, comprises the steps：
(1) aggregate grading design
Asphalt pavement material (RAP) is reclaimed to two grades to sieve, and according to《Asphalt highway regeneration techniques specification》
Middle grain formula level in (JTG F41-2008) is with requiring to be designed, and formate gradation composition see the table below 1.
The formate gradation composition table of table 1
(2) optimum moisture content OWC is determined
Total amount of gathering materials is set to 1040g, and cement adds according to the outer mode of mixing to gather materials, and volume is gather materials the 1.5% of total amount, breast
Change pitch volume and be set to 3%, as 31.2g, determine that optimum moisture content OWC is 3.4% according to specification JTG F41-2008, now
It is 54.1g that emulsified asphalt, which is calculated, with outer water mixing sum.
(3) optimum emulsification asphalt content OEC is determined
It is that 54.1g is constant to keep emulsified asphalt and outer water mixing sum, change emulsified asphalt volume is 1%, 2%, 3%,
4%th, 5% 5 group, now, five groups of outer water mixing consumptions are respectively 43.7g, 33.3g, 22.9g, 12.5g, 2.1g, according to existing
Specification carries out marshal piece preparation and health, and carries out voidage, 15 DEG C of diametral compression tests, indirect tensile test on frozen-thaw to 5 groups of test specimens
With 60 DEG C of unconfined compression strength tests (needing other sample preparation), the performance indications testing result of 5 groups of test specimens is shown in Table 2.According to the knot of table 2
Fruit is corresponding to draw cold regeneration mix voidage and bitumen aggregate ratio graph of relation (referring to Fig. 2), 15 DEG C of splittings of cold regeneration mix
Intensity and bitumen aggregate ratio graph of relation (referring to Fig. 3), cold regeneration mix TSR and bitumen aggregate ratio graph of relation (referring to Fig. 4) and
60 DEG C of unconfined compressive strengths of cold regeneration mix and bitumen aggregate ratio graph of relation (referring to Fig. 5).
The Cold Recycled Mixture with Emulsified Asphalt designing technique testing result of table 2
According to the technical requirements of table 2, when during cold regeneration mix is used for, cutting optimal design and construction when, voidage index is not
More than 9%, 15 DEG C cleavage strength is not less than 0.7MPa, and freeze-thaw split strength ratio is not less than 75%, 60 DEG C of unconfined compressive strengths
Not less than 0.36MPa.From Fig. 2~5, the reasonable volume scope of emulsified asphalt is 3.2%~3.7%, and high limit is by 60 DEG C of nothings
Confined compressive strength index determines that the lowest limit is determined by voidage VV indexs, according to general design principles, it is considered to cost economic benefit
Etc. factor, the optimum emulsification asphalt content OEC=3.2% of this group of cold regeneration mix.
Comparative example
Using the RAP salvage materials with the same material source of embodiment, requirement is matched somebody with somebody and designed and constructed to identical design level, same
Cold renewal special-purpose emulsifying pitch, according to specification《Asphalt highway regeneration techniques specification》Appendix D side in JTG F41-2008
Method, carries out Cold Recycled Mixture with Emulsified Asphalt mix-design, and it is 3.4% to determine optimum moisture content OWC, and optimum emulsification pitch is used
It is 3.4% to measure OEC；In addition, obtaining optimum emulsification asphalt content OEC and optimum moisture content OWC according to embodiment prepares compound,
According to code requirement, wheel tracking test is carried out, is as a result shown, embodiment and the corresponding dynamic stability test result of comparative example are both greater than
The code requirement of 2800mm/ times, the results are shown in Table 3.
The cold regeneration mix dynamic stability of table 3 is detected
| Dynamic stability (60 DEG C) (mm/ times) | |
| Embodiment | 3404 |
| Comparative example | 3358 |
Referring to table 3, embodiment determines that result is close with the OEC of comparative example, illustrates that the OEC that the present invention is provided determines that method has
There is feasibility, the optimum emulsification asphalt content OEC outlines determined using embodiment method are less than current method for normalizing (comparative example)
The OEC of determination, from the aspect of economic benefit, helps to save construction cost, and the determination OEC of embodiment use method,
Small, the characteristics of reproducibility is strong with experimental implementation variability, uses suitable for promoting.
The present invention is described in detail above, its object is to allow the personage for being familiar with this art to understand this
The content of invention is simultaneously carried out, and it is not intended to limit the scope of the present invention, all Spirit Essence institutes according to the present invention
The equivalent change or modification of work, should all cover within the scope of the present invention.
Claims (8)
1. a kind of method for determining cold regeneration mix optimum emulsification asphalt content OEC, including (1) determine optimum moisture content OWC；
(2) cold regeneration mix of multigroup different emulsified asphalt volumes is formed；(3) Marshall is carried out to multigroup cold regeneration mix
Test material preparation, and carry out test specimen health and hit reality；(4) test specimen by step (3) is tested, determines optimum emulsification pitch
Consumption OEC, it is characterised in that：In the step (1), it is determined that after optimum moisture content OWC, calculating emulsified asphalt and outer water mixing weight
Sum is measured, and determines that the emulsified asphalt and outer water mixing weight sum are invariant A；In step (2), each group cold renewal is kept
The emulsified asphalt of compound and outer water mixing sum are the invariant A, change emulsified asphalt volume and outer water mixing volume.
2. the method according to claim 1 for determining cold regeneration mix optimum emulsification asphalt content OEC, its feature exists
In：In step (2), at least 5 groups cold regeneration mixes are formed.
3. the method according to claim 1 for determining cold regeneration mix optimum emulsification asphalt content OEC, its feature exists
In：In step (2), emulsified asphalt content changes in single-candidate in multigroup cold regeneration mix.
4. the method according to claim 3 for determining cold regeneration mix optimum emulsification asphalt content OEC, its feature exists
In：In step (2), the single-candidate changing value is 1%.
5. the method according to claim 1 for determining cold regeneration mix optimum emulsification asphalt content OEC, its feature exists
In：In step (2), 5 groups of cold regeneration mixes are formed, the emulsified asphalt contents of 5 groups of cold regeneration mixes is respectively 1%,
2%th, 3%, 4% and 5%.
6. the method according to claim 1 for determining cold regeneration mix optimum emulsification asphalt content OEC, its feature exists
In：In step (4), the experiment includes freeze-thaw split TSR experiments, 15 DEG C of diametral compression tests, 60 DEG C of unconfined compression strength tests.
7. the method for the determination cold regeneration mix optimum emulsification asphalt content OEC according to claim 1 or 6, its feature
It is：The step (1), step (3), step (4) are according to specification《Asphalt highway regeneration techniques specification》(JTG F41-
2008) implement.
8. the method according to claim 1 for determining cold regeneration mix optimum emulsification asphalt content OEC, its feature exists
In：Methods described also includes step (5)：According to the optimum emulsification asphalt content OEC and optimum moisture content OWC of determination, according to existing
OK《Highway engineering pitch and Asphalt Mixture Experiment code》The methods of (JTJ 052) T 07 19 carry out asphalt rut examination
Checking, wheel tracking test is qualified, obtains optimum emulsification asphalt content OEC.
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| CN107976389A (en) * | 2017-10-09 | 2018-05-01 | 淮阴工学院 | A kind of method of old material effective regeneration rate in measure heat regeneration asphalt mixture |
| CN107976389B (en) * | 2017-10-09 | 2020-07-24 | 淮阴工学院 | Method for measuring effective regeneration rate of old material in thermal regeneration asphalt mixture |
| CN109459348A (en) * | 2018-11-09 | 2019-03-12 | 交通运输部公路科学研究所 | The method for determining waste and old SBS modified asphalt regeneration agent dosage |
| CN109633137A (en) * | 2018-12-29 | 2019-04-16 | 同济大学 | The method for determining emulsified asphalt optimum amount in Emulsified Asphalt Mixture |
| CN109781489A (en) * | 2019-03-15 | 2019-05-21 | 东南大学 | The preparation method of the Cold Recycled Mixture with Emulsified Asphalt test specimen of long-term performance in a kind of consideration |
| CN109781489B (en) * | 2019-03-15 | 2021-06-08 | 东南大学 | Preparation method of emulsified asphalt cold-recycling mixture test piece considering long-term performance |
| CN111445966A (en) * | 2020-05-12 | 2020-07-24 | 中国公路工程咨询集团有限公司 | Method for determining external water mixing amount of emulsified asphalt cold-recycling mixture |
| CN111445966B (en) * | 2020-05-12 | 2023-04-18 | 中国公路工程咨询集团有限公司 | Method for determining external water mixing amount of emulsified asphalt cold-recycling mixture |
| CN115078700A (en) * | 2022-06-15 | 2022-09-20 | 保利长大工程有限公司 | Mix-in-plant cold recycled asphalt mixture mix proportion design process |
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Application publication date: 20170714 |