CN108570907A - The construction method of foamed asphalt cold in place recycling - Google Patents
The construction method of foamed asphalt cold in place recycling Download PDFInfo
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- CN108570907A CN108570907A CN201810299891.3A CN201810299891A CN108570907A CN 108570907 A CN108570907 A CN 108570907A CN 201810299891 A CN201810299891 A CN 201810299891A CN 108570907 A CN108570907 A CN 108570907A
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- asphalt
- cold
- foamed asphalt
- moisture content
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The present invention provides a kind of construction method of foamed asphalt cold in place recycling, includes the following steps：S1 synthesizes the gradation design of mixture；S2, fancy grade match the selection of mineral aggregate；S3, the selection of optimum moisture content；S4, the selection of best foamed asphalt additive amount；S5 makes test specimen using gyratory compaction method under conditions of optimum moisture content and best foamed asphalt additive amount with mineral aggregate with fancy grade, verifies its dry and wet Ratio of split strength, whether freeze-thaw split intensity than meets《Asphalt highway regeneration techniques specification》Requirement, if satisfied, then above-mentioned steps determine proportioning be optimum ratio；Otherwise, return to step S1 re-starts the gradation design of synthesis mixture；S6 carries out cold in place recycling construction according to optimum ratio；S7, health.Proportion design method overcomes the limitation of current specifications, to the improvement of technique in S6, overcomes gather materials addition difficulty and the drawbacks of dispensing airborne dust of gathering materials, improves the uniformity gathered materials and mixed and stirred, be more conducive to Green civilization construction.
Description
Technical field
The present invention relates to technical field of road engineering more particularly to a kind of construction methods of foamed asphalt cold in place recycling.
Background technology
Year end 2016 of cut-off, highway in China total kilometrage quantity have reached 469.63 ten thousand kilometers, wherein standard highway it is total in
Journey is 422.63 ten thousand kilometers, 13.1 ten thousand kilometers of high speed standard highway total kilometrage, prospect of turning one's head, before 10 years, total mileage of highway number
345.7 ten thousand kilometers, wherein 228.29 ten thousand kilometers of standard highway total kilometrage, only 4.53 ten thousand kilometers of high speed standard highway total kilometrage,
During nearly 10 years, highway mileage increment is 35.85%, and standard highway total kilometrage increment is 85.13%, and high speed grade is public
Road increment is 189.18%.It is possible thereby to which, it is envisioned that China's kilometer repairerment in recent years, which is safeguarded, will enter explosive growth.
The recycling research of ground surface material attracts wide attention, and to realize the recycling of waste and scrap, reduces ring
Border is polluted, and is economized on resources, energy consumption, to realize that recyclable development, active response country are called, development environment friendly, and warp
Ji economizing type pavement preservation technology.
For at this stage, the regenerative use technology of bituminous paving mixed and stirred from mixture can be divided into temperature heat mix and stir it is cold
Mix, road mix mixed and stirred from mixing and stirring place again and can be divided into field, according to regrown material and thickness can be divided into again bitumen layer cold in place recycling and
Full depth formula cold in place recycling.Cold mixing is compared, hot asphalt need to carry out mix pitch heating and temperature requirement is higher, and fuel disappears
Consume it is larger, mix and stir, transport, in paving process generate toxic smog it is more, be unfavorable for energy saving discharge and environmental protection；Heat mixes drip
Blueness requires the construction lowest temperature, limits the activity duration, can lack the construction time section；To temperature requirement when hot asphalt is constructed
It is higher, transport is limited, paves, roll the time；Heat mixes construction cost height.Opposite road mix (in-place regeneration), field is mixed need to first will be former
Ground surface material is recycled, and is transported to mixing station, after the completion of being mixed and stirred through special mixing building, need to again be transported to scene, be unfavorable for
Cost savings.In summary the cold in place recycling collection plurality of advantages and the whole body, overcome heat and mix and stir the limitation that field is mixed, meet and work as
Under advocated Green civilization construction requirement.
The realization of foamed asphalt cold in place recycling generally comprises following steps：
(1) mix-design of asphalt
Foamed asphalt mix-design global range not yet forms unified standard, and current Chinese code of practice design objective is to be based on
What Marshall method proposed, carry out mixture performance evaluation with cleavage strength and Marshall stability index.
(2) original path status evaluation treatment of road surfaces
Original path is investigated, data collection is analyzed, and then objective evaluation is carried out to former road surface, under regeneration zone
Good performance should be had by holding layer, and flexure meets road structure layer feasible value as defined in current specifications, for incongruent
Section carries out sub-layer processing；For the region that road elevation changes greatly, pre-processing should be done, to ensure that regeneration zone is smooth
Degree.
(3) gather materials, active material dispenses
Before in-place regeneration operation, according to mix-design, carried out on road surface new addition gather materials, active material (cement,
Flyash etc.) spreading, dispensing should be uniform, and spreading amount meets ratio requirement.
(4) mix-in-place
Milling is carried out after the completion of dispensing to mix and stir, and is mixed and stirred and is carried out at the same time water, the addition of foamed asphalt binder, carries out high-speed stirring
It mixes.
(5) mixture making
It mixes and stirs and completes mixture when storing on the spot, struck off using Slicking apparatus；Mixture can also lead to after the completion of mixing and stirring
It crosses conveyer belt and is sent to paver and pave.High process control conducts height method using steel wire.Pressure road is selected after leveling immediately
Machine is compacted.
(6) health
Natural Health preservation after the completion of making stops when mixture moisture content is reduced to 2% or less or can take out core sample
Maintenance carries out next procedure construction.
Existing Cold In-place Recycling Technology with Foamed Bitumen has the following disadvantages：
1, it in mix-design final gradation, normally only chooses and meets 1~3 group of code requirement or so sample, carry out
The proportioning that Marshall experimental selection is dominant does not propose that grading selection method, the test specimen that the later stage need to make are more.Marshall method and
In limitation, it cannot really reflect rubbing to bituminous paving of road roller and later stage vehicular load in construction, rolling effect；Horse
Xie Er compaction test apparatus hits positive activity deficiency, and hitting real work by increase striking times raising equally exists drawback.Due to hitting real work not
Foot, the standard density obtained are less than normal.
2, gather materials or active material spreading need to dispense before regenerating mix, spreading amount is not easy to control, and fine aggregate presence is raised
Dirt phenomenon pollutes environment.Addition virgin material metering is inaccurate or addition is uneven to cause mix material proportioning to change, and mix
Material match ratio loses meaning, it may appear that construction quality problem.If want to obtain it is good dispense effect, need to add it is special gather materials,
Cement, miberal powder truck spreader increase machine cost.
Invention content
In view of the present situation of the prior art, the purpose of the present invention is to provide a kind of construction parties of foamed asphalt cold in place recycling
Method, which raises the embedded squeezing ability for gathering materials mutual, enhance mixture shearing resistance should be able to, overcome the limitation of current specifications method
And limitation, effective supplement has been carried out to current specifications Marshall method, has more been close to the practical road stressing conditions of mixture, has been improved
The uniformity mixed and stirred of gathering materials, overcomes to gather materials to add and dispenses airborne dust drawback, is more conducive to Green civilization construction.It is above-mentioned to realize
Purpose, technical scheme is as follows：
A kind of construction method of foamed asphalt cold in place recycling, includes the following steps：
S1 synthesizes the gradation design of mixture：Three groups of the synthesis mixture percent of pass upper limit, intermediate value, lower limit gradings are chosen, with
2.36mm and 9.5mm sieve pores be boundary will synthesize mixture be divided into it is thin, in, thick three classes, choose 2.36mm~9.5mm grain size specifications and
Three groups of the percent of pass upper limit, intermediate value, lower limit gradings of two grades of 2.36mm or less grain size specifications are obtained by carrying out Orthogonal Composite
To 9 groups of different gradation mineral aggregates；Wherein, the synthesis mixture gather materials by recycling asphalt pavement material, newly, miberal powder and active material
Composition, active material are cement or/and flyash；
S2, fancy grade match the selection of mineral aggregate：Sample preparation is carried out respectively to the 9 groups of different gradation mineral aggregates obtained in step S1, so
It carries out direct shearing test respectively afterwards, selects the grading mineral aggregate corresponding to the maximum one group of test specimen of internal friction angle and match mine as fancy grade
Material；
S3, the selection of optimum moisture content：Foamed asphalt dosage 3%, respectively choose moisture content be 3%, 4%, 5%, 6%,
7%, 8% fancy grade makes 6 groups of test specimens with mineral aggregate, carries out compaction test respectively to 6 groups of test specimens, must launch an attack real song
Line finds the first maximum dry density with maximum value on tamping curve；Again with foamed asphalt dosage 3%, moisture content first
The fancy grade of water content corresponding to maximum dry density makes test specimen with mineral aggregate by gyratory compaction method, obtains closest hit
Real experiment determines the number of revolutions of the first maximum dry density, then using identified number of revolutions as product parameter, with bubble
Foam asphalt content 3% is chosen the fancy grade that moisture content is 3%, 4%, 5%, 6%, 7%, 8% and is rotated with mineral aggregate respectively
Debulking methods make 6 groups of test specimens, obtain water content-dry density relation curve, finding on water content-dry density relation curve has
Second maximum dry density of maximum value, using the corresponding moisture content of the second maximum dry density as the best aqueous of mix-design
Amount；
S4, the selection of best foamed asphalt additive amount：The fancy grade matches mineral aggregate under conditions of the optimum moisture content,
2%, 2.3%, 2.6%, 2.9% foamed asphalt additive amount of selection carries out gyratory compaction molding and makes 4 groups of φ 150mm drips respectively
Green mixture cylinder test specimen carries out asphalt mixture porosity to 4 groups of φ 150mm asphalt cylinder test specimens respectively
It is mixed that 4 groups of φ 150mm pitches are chosen according to test result using compression strength and porosity as index with the experiment of compression strength
The optimal test specimen in material cylinder test specimen is closed, the corresponding foamed asphalt additive amount of the optimal test specimen is added as best foamed asphalt
Amount；
Wherein, the method for selecting of number of revolutions is as follows in gyratory compaction molding：
The fancy grade with mineral aggregate under conditions of the optimum moisture content, respectively select 2%, 2.3%, 2.6%,
2.9% foamed asphalt additive amount makes 4 groups of test specimens using Marshall method, carries out compaction test respectively to 4 groups of test specimens, selects
Maximum one group of density；
The fancy grade matches mineral aggregate under conditions of the optimum moisture content, corresponding to maximum one group of the density
The method that foamed asphalt additive amount carries out gyratory compaction makes test specimen, obtains the rotation closest to the determined maximal density of compaction test
Turn number, which is number of revolutions in gyratory compaction molding；
S5, with the fancy grade with mineral aggregate the optimum moisture content and the best foamed asphalt additive amount condition
Gyratory compaction method is pressed down and makes test specimen, verifies the dry and wet Ratio of split strength of test specimen, whether freeze-thaw split intensity than meets《Highway
Applied of Asphalt Pavement Recycle Technique specification》Requirement, if satisfied, then above-mentioned steps determine proportioning be optimum ratio；Otherwise, step is returned
Rapid S1 re-starts the gradation design of synthesis mixture；
S6 carries out cold in place recycling construction according to the optimum ratio；Wherein, newly gather materials, miberal powder passes through the truck spreader that gathers materials
It is dispensed, active material and water are to be added in cold regenerative machine in form of slurry, are newly gathered materials, miberal powder, foamed asphalt, activity
Substance, water and recycling asphalt pavement material form asphalt；
S7, health.
Further, further include the steps that evaluating original path before step S6, it is specific as follows：
The completion information for collecting original path, specifies original path design objective, to the flexure, design altitude, traffic of original path
Amount is investigated, to determine regeneration scheme；
The region that former design standard is not met for flexure carries out local strengthening processing, using mixing the materials such as cement, lime
Material carries out reinforcement, and performance indicator meets former design standard requirement after making processing；If foamed asphalt cold renewal layer is as face layer, need pair
Local elevation changes greatly region and is pre-processed, to ensure later stage smooth degree of layer；
Original path is segmented and carries out moisture content detection, when changes in environmental conditions causes original path water-cut variation, Ying Chong
It is new to carry out moisture content detection.
Further, step S6 includes the following steps：
S61 prepares before constructing, material, mechanical admission：
S62 carries out amount of water calculating by asphalt moisture content, sets in measuring equipment and newly gather materials and miberal powder
Tret parameter, the concentration of cement mortar and fountain height parameter, the fountain height parameter of foamed asphalt；
S63 measures setting-out according to Design for Regeneration drawing, conducts elevation using aluminium alloy, aluminium alloy is positioned over survey pier
On, it surveys pier 5m and puts one；
S64 carries out cold in place recycling using cold in place recycling unit, and cold in place recycling unit includes gather materials truck spreader, water
Mud of technological requirement, asphalt truck, cold regenerative machine, paver and road roller, the truck spreader that gathers materials, cement mortar vehicle, asphalt truck, it is cold again
Life, paver and road roller are arranged in order to form regeneration train groups；Each machinery at the uniform velocity travels, and keeps spacing constant, operation speed
Degree keeps 3-5m/min.
In the present embodiment, using the slurries that cement and water mix as cement mortar.It in other embodiments, can be with water
The slurries that mud, flyash and water mix replace the cement mortar；Alternatively, being replaced with the slurries that flyash and water mix
The cement mortar.
Further, during carrying out cold in place recycling, the tret of each raw material is as follows：The new 61.83kg/m that gathers materials, mine
The tret of powder 41.22kg/m, cement 15.45kg/m, water 51.53kg/m, foamed asphalt 20.98kg/m, water contain in old pipeline material
It is remained unchanged in the case that water rate is constant, if old road water-cut variation, the corresponding adjustment of tret dynamic of water；Wherein, pitch adds
Hot temperature is 155 DEG C, foaming water amount 1.5%.
Further, the depth of asphalt regenerative is that face layer is complete thick, milling depth 9-10cm, regeneration zone compacted thickness
12cm。
Further, during carrying out cold in place recycling, including bituminous mixture laying on road surface and pressed
Real step, it is specific as follows：
Paving for asphalt is carried out using ABG8820 pavers, Paving Techniques are the same as plain asphalt mixture, screed
It without heating, arranges special messenger to follow and checks whether uniform mixing, if isolation, grey material occurs, hard stop finds reason, row
Except failure rear can proceed with operation；Experimenter spot-check mix moisture content, if being unsatisfactory for requiring, carries out in time
Adjustment；
It is compacted using double steel wheels and pneumatic-tired rollers combination, wherein dual-steel wheel road roller carries out first pressing and multiple pressure, glue
Roller carries out final pressure；First pressing should closely follow paver, seal surface layer, avoid moisture evaporation too fast, influence mixture compacting；It is double
It is 2 that steel roller, which uses brave horse HD128, quantity, and 2 dual-steel wheel road rollers respectively roll 5-6 times；Rubber tire selects brave horse
GRW280 is rolled 8 times；Compactness detection is carried out after the completion of rolling immediately, natural Health preservation is carried out after detection is qualified, is otherwise mended
Pressure, until reaching requirement.
Further, the cement mortar is replaced with the slurries that cement, flyash and water mix；Alternatively, with flyash
The cement mortar is replaced with the slurries that water mixes.
Further, in step S7, health uses natural Health preservation, when asphalt moisture content is less than 2% or can be with
When taking out complete core sample, upper layer bitumen layer making can be carried out.
Further, in step S3, the gyratory compaction angle of test specimen gyratory compaction molding method uses 1.25 °, vertical pressure
Select 600Kpa, rotary speed that 30r/min, gyratory compaction is used to make Compaction Effort with standard compaction test compactive effort, rotation time
Number is 50 times.
Further, in step S4, the parameter of gyratory compaction molding test specimen is：It is compacted 1.25 ° of angle, vertical pressure
600Kpa, rotary speed 30r/min, number of revolutions are 50 times.
The beneficial effects of the invention are as follows：
The construction method of the foamed asphalt cold in place recycling of the present invention carries out Cold Recycling Mixtures with Foamed Asphalt proportioning
Optimization, improve the embedded squeezing ability for gathering materials mutual, enhance mixture shearing resistance should be able to, to current specifications Marshall method carry out
Effective supplement, is more close to the practical road stressing conditions of mixture, can search out pavement performance more preferably mix proportion scheme, overcome
The limitation of current specifications method and limitation.Using single factor analysis, to mixture gradation, mixture optimum moisture content, foam
Pitch optimum amount one by one variable select it is excellent, it is proposed that a kind of modification method of foamed asphalt mix-design.Specimen molding is selected
Gyratory compaction, closer to road occupation operating mode, can really reflect construction in later period and automobile to the rubbing of mixture, roll effect
Fruit overcomes Marshall experiment and hits the insufficient limitation of real work.
Improvement optimization is carried out to regenerating device, increases the truck spreader that gathers materials, the vehicle is integrated newly to add building stones, miberal powder addition to be integrated,
Have miniature electronic control system, have weigh, mix and stir, deployment functions, will it is new plus gather materials carry out uniform mixing after dispense,
Micro water need to be sprayed into when mixing and stirring, and kept dispensing material moistening, be unlikely to airborne dust；Cement mortar vehicle can accurately count cement, water
Amount, will measure accurate water and cement mixes and stirs into cement mortar can be sprayed into foamed asphalt and mix and stir rotor front end, ensure that and mixes and stirs
Uniformity, overcome gather materials addition airborne dust drawback, overcome the problems, such as cement can not uniform mixing, be more conducive to Green civilization and apply
Work.
The arrangement for optimizing regeneration train groups, by cement distribution vehicle be changed to gather materials truck spreader, by waterwheel improvement be cement mortar
Vehicle overcomes the airborne dust that addition is gathered materials and mixes and stirs problem of non-uniform.
By being improved to entirely regeneration group train so that regeneration group train is more in line with domestic construction market, effectively
Overcome problem of environmental pollution, gather materials addition deviate match ratio, the problems such as mixing and stirring unevenness of gathering materials, improve construction quality, expand
The big scope of application of foamed asphalt cold regeneration construction, contribution is made that for the popularization of Cold In-place Recycling Technology with Foamed Bitumen.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments to the present invention
The construction method of foamed asphalt cold in place recycling be further elaborated.It should be appreciated that specific reality described herein
It applies example to be only used for explaining the present invention, be not intended to limit the present invention.
The construction method of the foamed asphalt cold in place recycling of one embodiment of the invention, includes the following steps：
S1 synthesizes the gradation design of mixture：Three groups of the synthesis mixture percent of pass upper limit, intermediate value, lower limit gradings are chosen, with
2.36mm and 9.5mm sieve pores be boundary will synthesize mixture be divided into it is thin, in, thick three classes, choose 2.36mm~9.5mm grain size specifications
With three groups of the percent of pass upper limit, intermediate value, lower limit gradings of two grades of 2.36mm or less grain size specifications, pass through progress Orthogonal Composite
Obtain 9 groups of different gradation mineral aggregates；Wherein, the synthesis mixture gather materials by recycling asphalt pavement material, newly, miberal powder and active matter
Matter forms, and active material is cement or/and flyash；
S2, fancy grade match the selection of mineral aggregate：Sample preparation is carried out respectively to the 9 groups of different gradation mineral aggregates obtained in step S1, so
It carries out direct shearing test respectively afterwards, selects the grading mineral aggregate corresponding to the maximum one group of test specimen of internal friction angle and match mine as fancy grade
Material；
S3, the selection of optimum moisture content：Foamed asphalt dosage 3%, respectively choose moisture content be 3%, 4%, 5%, 6%,
7%, 8% fancy grade makes 6 groups of test specimens with mineral aggregate, carries out compaction test respectively to 6 groups of test specimens, must launch an attack real song
Line finds the first maximum dry density with maximum value on tamping curve；Again with foamed asphalt dosage 3%, moisture content first
The fancy grade of water content corresponding to maximum dry density makes test specimen with mineral aggregate by gyratory compaction method, obtains closest hit
Real experiment determines the number of revolutions of the first maximum dry density, then using identified number of revolutions as product parameter, with bubble
Foam asphalt content 3% is chosen the fancy grade that moisture content is 3%, 4%, 5%, 6%, 7%, 8% and is rotated with mineral aggregate respectively
Debulking methods make 6 groups of test specimens, obtain water content-dry density relation curve, finding on water content-dry density relation curve has
Second maximum dry density of maximum value, using the corresponding moisture content of the second maximum dry density as the best aqueous of mix-design
Amount；
S4, the selection of best foamed asphalt additive amount：The fancy grade matches mineral aggregate under conditions of the optimum moisture content,
2%, 2.3%, 2.6%, 2.9% foamed asphalt additive amount of selection carries out gyratory compaction molding and makes 4 groups of φ 150mm drips respectively
Green mixture cylinder test specimen carries out asphalt mixture porosity to 4 groups of φ 150mm asphalt cylinder test specimens respectively
It is mixed that 4 groups of φ 150mm pitches are chosen according to test result using compression strength and porosity as index with the experiment of compression strength
The optimal test specimen in material cylinder test specimen is closed, the corresponding foamed asphalt additive amount of the optimal test specimen is added as best foamed asphalt
Amount；
Wherein, the method for selecting of number of revolutions is as follows in gyratory compaction molding：
The fancy grade with mineral aggregate under conditions of the optimum moisture content, respectively select 2%, 2.3%, 2.6%,
2.9% foamed asphalt additive amount makes 4 groups of test specimens using Marshall method, carries out compaction test respectively to 4 groups of test specimens, selects
Maximum one group of density；
The fancy grade matches mineral aggregate under conditions of the optimum moisture content, corresponding to maximum one group of the density
The method that foamed asphalt additive amount carries out gyratory compaction makes test specimen, obtains the rotation closest to the determined maximal density of compaction test
Turn number, which is number of revolutions in gyratory compaction molding.
S5, with the fancy grade with mineral aggregate the optimum moisture content and the best foamed asphalt additive amount condition
Gyratory compaction method is pressed down and makes test specimen, verifies the dry and wet Ratio of split strength of test specimen, whether freeze-thaw split intensity than meets《Highway
Applied of Asphalt Pavement Recycle Technique specification》Requirement, if satisfied, then above-mentioned steps determine proportioning be optimum ratio；Otherwise, step is returned
Rapid S1 re-starts the gradation design of synthesis mixture；
S6 carries out cold in place recycling construction according to the optimum ratio；Wherein, newly gather materials, miberal powder passes through the truck spreader that gathers materials
It is dispensed, active material and water are to be added in cold regenerative machine in form of slurry, are newly gathered materials, miberal powder, foamed asphalt, activity
Substance, water and recycling asphalt pavement material (old asphalt pavement milling material) form asphalt；
S7, health.
Using single factor analysis, to mixture gradation, mixture optimum moisture content, foamed asphalt optimum amount variable one by one
It selects excellent, it is proposed that a kind of modification method of foamed asphalt mix-design.To plate form rubber grading select excellent, raising
The embedded squeezing ability for gathering materials mutual, enhance mixture shearing resistance should be able to, effective benefit has been carried out to current specifications Marshall method
It fills, is more close to the practical road stressing conditions of mixture.
Preferably, in step s3, the gyratory compaction angle of test specimen gyratory compaction molding method uses 1.25 °, vertical pressure
Select 600Kpa, rotary speed that 30r/min, gyratory compaction is used to make Compaction Effort with standard compaction test compactive effort, rotation time
Number is 50 times.In step s 4, the parameter of gyratory compaction molding test specimen is：It is compacted 1.25 °, vertical pressure 600Kpa of angle, rotation
Speed 30r/min, number of revolutions are 50 times.
The new percent of pass to gather materials in 9.5mm sieve pores is 100%.The new preferably building stones that gather materials.It is described newly to gather materials
It can be rubble.
As a kind of preferable embodiment, step S6 includes the following steps：
S61 prepares before constructing, material, mechanical admission：
S62 carries out amount of water calculating by asphalt moisture content, sets in measuring equipment and newly gather materials and miberal powder
Tret parameter, the concentration of cement mortar and fountain height parameter, the fountain height parameter of foamed asphalt；
S63 measures setting-out according to Design for Regeneration drawing, conducts elevation using aluminium alloy, aluminium alloy is positioned over survey pier
On, it surveys pier 5m and puts one；
S64 carries out cold in place recycling using cold in place recycling unit, and cold in place recycling unit includes gather materials truck spreader, water
Mud of technological requirement, asphalt truck, cold regenerative machine, paver and road roller.
Gather materials truck spreader, cement mortar vehicle, asphalt truck, cold regenerative machine, paver and road roller is arranged in order to form regeneration
Train groups；Each machinery at the uniform velocity travels, and keeps spacing constant, and operating speed keeps 3-5m/min.
Preferably, on road surface and being compacted during carrying out cold in place recycling, including by bituminous mixture laying
The step of, it is specific as follows：
Paving for asphalt is carried out using ABG8820 pavers, Paving Techniques are the same as plain asphalt mixture, screed
It without heating, arranges special messenger to follow and checks whether uniform mixing, if isolation, grey material occurs, hard stop finds reason, row
Except failure rear can proceed with operation；Experimenter spot-check mix moisture content, if being unsatisfactory for requiring, carries out in time
Adjustment；Preferably, also asphalt is added in stirring container before paving and carries out secondary mixing, to prevent isolation, flower
The generation expected in vain.
It is compacted using double steel wheels and pneumatic-tired rollers combination, wherein dual-steel wheel road roller carries out first pressing and multiple pressure, glue
Roller carries out final pressure；First pressing should closely follow paver, seal surface layer, avoid moisture evaporation too fast, influence mixture compacting；It is double
It is 2 that steel roller, which uses brave horse HD128, quantity, and 2 dual-steel wheel road rollers respectively roll 5-6 times；Rubber tire selects brave horse
GRW280 is rolled 8 times；Compactness detection is carried out after the completion of rolling immediately, natural Health preservation is carried out after detection is qualified, is otherwise mended
Pressure, until reaching requirement.
Preferably, during carrying out cold in place recycling, the tret of each raw material is as follows：The new 61.83kg/m that gathers materials, miberal powder
41.22kg/m, cement 15.45kg/m, water 51.53kg/m, foamed asphalt 20.98kg/m pass through miniature electronic control before construction
Device processed has inputted above-mentioned data.
The tret of water is remained unchanged in the case where old pipeline material moisture content is constant, if old road water-cut variation, water
The corresponding adjustment of tret dynamic；Wherein, asphalt heating temperature is 155 DEG C, foaming water amount 1.5%.
Cold regenerative machine set foamed asphalt, cement mortar addition be integrated, gather materials truck spreader collection newly plus gather materials, miberal powder metering,
It mixes and stirs, dispense and be integrated, cement mortar vehicle integrates metering, mixes and stirs, and in each equipment, is equipped with miniature electronic controller, can be real
Existing additive amount is according to regeneration vehicle travel speed accurate measurement.Gather materials, active material uses the weight amount of being added control, water, drip
Blueness is controlled using flowmeter, which can realize according to Vehicle Speed dynamically-adjusting parameter, uniformly add unit road
The various fillings of journey.
Active material (cement, flyash etc.) addition is mixed using with water, is added into regenerating device in form of slurry
System avoids the appearance of airborne dust.
Further include the steps that evaluating original path before step S6 as a kind of preferable embodiment, it is specific as follows：
The completion information for collecting original path, specifies original path design objective, to the flexure, design altitude, traffic of original path
Amount is investigated, to determine regeneration scheme；
The region that former design standard is not met for flexure carries out local strengthening processing, using mixing the materials such as cement, lime
Material carries out reinforcement, and performance indicator meets former design standard requirement after making processing；If foamed asphalt cold renewal layer is as face layer, need pair
Local elevation changes greatly region and is pre-processed, to ensure later stage smooth degree of layer；
Original path is segmented and carries out moisture content detection, when changes in environmental conditions causes original path water-cut variation, Ying Chong
It is new to carry out moisture content detection.Original path is segmented and carries out moisture content detection, general recommendations carries out for one day before regeneration, when environment item
When part variation causes original path water-cut variation, moisture content detection should be re-started.
In above example, the depth of asphalt regenerative is that face layer is complete thick, milling depth 9-10cm, regeneration zone compacting
Thickness 12cm.
When being described in detail below to the quadratic-orthogonal experiment for synthesizing mixture, such as final gradation carried out to mineral aggregate,
With 2.36mm and 9.5mm sieve pores will synthesize mixture be divided into it is thin, in, thick three classes, then calculate plate form rubber specification
It is required that the upper limit of grading, intermediate value, lower limit, are combined upper, middle and lower limit with 2.36,9.5mm points for three parts respectively.Due to
The gather materials percent of pass of 9.5mm sieve pores of newly addition is all 100% in this example, then need to only combine 2.36mm or less and 9.5mm hereinafter,
As shown in table 1 below, 9 groups of samples are synthesized.
Table 1
Table 1 is orthogonal test table, wherein the word that horizontal line is drawn in table represents passing through for 2.36~9.5mm grain size specifications
Rate；The word for not drawing horizontal line represents the percent of pass of 2.36mm or less grain size specifications.
It is combined into grading to previous step obtains 9 and carries out sample preparation, then carries out direct shearing test respectively, select internal friction angle
Maximum one group of test specimen, matches as fancy grade, by the step, has been carried out preferably to grading, and coarse aggregate interlocking can be formed mutually
Skeleton, embedded squeezing ability is strong, improves the shear behavior of mixture, improves Asphalt Mixture.
The synthesis ratio for selecting fancy grade to match, makes 6 groups of test specimens, test specimen foamed asphalt dosage 3%, and moisture control is
3%, 4%, 5%, 6%, 7%, 8%, real sample is hit, experimental data is depicted as tamping curve, is selected out by tamping curve
Maximum dry density and corresponding moisture content, maximum dry density and corresponding water content are that foundation is changed by gyratory compaction method according to this
The number of revolutions for becoming specimen molding finds out the number of revolutions for realizing this maximum dry density.Then, different using above-mentioned 3%~8%
Moisture content makes test specimen respectively, makes test specimen by gyratory compaction, calculates density, carries out data fitting, obtain maximum dry density
Under water content, select this water content for the optimum moisture content of mix-design.
Under conditions of selected fancy grade is matched, optimum moisture content is constant, 2%, 2.3%, 2.6%, 2.9% foamed asphalt is selected
Additive amount makes marshal piece, makes a strength test to test specimen, selects maximum one group of density.Select maximum one group of density
Corresponding use oil mass (foamed asphalt additive amount), gyratory compaction is carried out with fancy grade with mineral aggregate under conditions of optimum moisture content
Method product finds out number of revolutions when maximal density in being walked on realizing, according to this number of revolutions conduct by changing number of revolutions
Experiment parameter sheet selects 2%, 2.3%, 2.6%, 2.9% foamed asphalt dosage to use gyratory compaction product again.This implementation
In example, shaping method of specimen gyratory compaction angle uses 1.25 °, and vertical pressure selects 600Kpa, rotary speed to use 30r/min,
Number of revolutions 50 times.Gyratory compaction molding φ 150mm asphalt cylinder test specimens, experiment show that the dry and wet of each test specimen is split
Resistance to spalling and density consider according to density and cleavage strength and foamed asphalt dosage, select a best foamed asphalt
Dosage.
Optimum asphalt content (foamed asphalt additive amount) is selected using rotary compactor, can simulate rubbing of the load to road
Effect is more in line with mixture road situation.
After the completion of optimum asphalt content is chosen, with fancy grade with mineral aggregate in optimum moisture content and best foamed asphalt additive amount
Under conditions of by gyratory compaction method make test specimen, verify dry and wet Ratio of split strength, the freeze-thaw split intensity ratio of test specimen, work as dry and wet
Ratio of split strength, freeze-thaw split intensity are than meeting《Asphalt highway regeneration techniques specification》It is required that when, then foamed asphalt is cold again
Raw mix mix-design is met the requirements.With fancy grade with mineral aggregate in optimum moisture content and best foamed asphalt additive amount
Under the conditions of by gyratory compaction method make test specimen when, parameter setting is as follows：It is compacted 1.25 °, vertical pressure 600Kpa of angle, rotation speed
30r/min is spent, number of revolutions is 50 times.
The construction method of the foamed asphalt cold in place recycling of the above various embodiments matches Cold Recycling Mixtures with Foamed Asphalt
It is optimized, overcomes limitation and the limitation of current specifications method, pavement performance more preferably mix proportion scheme can be searched out, mainly
It has the following advantages：
1. a pair plate form rubber grading select excellent, the embedded squeezing ability for gathering materials mutual is improved, mixture is enhanced
Shearing resistance should be able to, effective supplement has been carried out to current specifications Marshall method, has more been close to the practical road stressing conditions of mixture.
2. using single factor analysis, mixture gradation, mixture optimum moisture content, foamed asphalt optimum amount are become one by one
Amount is selected excellent, it is proposed that a kind of modification method of foamed asphalt mix-design.
3. specimen molding selects gyratory compaction that can really reflect construction in later period and vapour closer to road occupation operating mode
Rubbing of the vehicle to mixture, rolling effect overcome Marshall experiment less symbol and road occupation operating mode and to hit real work insufficient
Limitation.
4. pair regenerating device carries out improvement optimization, truck spreader be integrated with gather materials, miberal powder addition is integrated, regenerating device collection cement
Slurry, foamed asphalt addition, mixture are mixed and stirred and are integrated, cement mortar vehicle collection cement isoreactivity substance, water metering, to mix and stir be one
Body, each machinery realize being precisely controlled for match ratio, foamed asphalt and cement mortar, which are added directly to, to be mixed by miniature electronic controller
With before terminal, the new material that attaches using being dispensed after truck spreader uniform mixing, the uniformity for addition of gathering materials is ensure that, to further carry
The high uniformity mixed and stirred of gathering materials, overcomes to gather materials to add and dispenses airborne dust drawback, is more conducive to Green civilization construction.
5. optimizing the arrangement of regeneration train groups, sprinkling truck and cement truck spreader are cement mortar vehicle, are combined into one, integrated level
Higher, and overcome the airborne dust problem of active material (cement, flyash etc.) addition.By changing to entirely regenerating train groups
It is good so that regeneration train groups are more in line with domestic construction market, effectively overcome problem of environmental pollution, addition of gathering materials deviates and matches
Composition and division in a proportion, the problems such as mixing and stirring unevenness of gathering materials, improve construction quality, expand the scope of application of foamed asphalt cold regeneration construction, are
The popularization of Cold In-place Recycling Technology with Foamed Bitumen is made that contribution.
It should be noted that in the absence of conflict, the feature in the above various embodiments and embodiment can be mutual group
It closes.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.
Claims (10)
1. a kind of construction method of foamed asphalt cold in place recycling, which is characterized in that include the following steps：
S1 synthesizes the gradation design of mixture：Three groups of the synthesis mixture percent of pass upper limit, intermediate value, lower limit gradings are chosen, with
2.36mm and 9.5mm sieve pores be boundary will synthesize mixture be divided into it is thin, in, thick three classes, choose 2.36mm~9.5mm grain size specifications and
Three groups of the percent of pass upper limit, intermediate value, lower limit gradings of two grades of 2.36mm or less grain size specifications are obtained by carrying out Orthogonal Composite
To 9 groups of different gradation mineral aggregates；Wherein, the synthesis mixture gather materials by recycling asphalt pavement material, newly, miberal powder and active material
Composition, active material are cement or/and flyash；
S2, fancy grade match the selection of mineral aggregate：Sample preparation is carried out respectively to the 9 groups of different gradation mineral aggregates obtained in step S1, is then divided
Direct shearing test is not carried out, is selected the grading mineral aggregate corresponding to the maximum one group of test specimen of internal friction angle and is matched mineral aggregate as fancy grade；
S3, the selection of optimum moisture content：Foamed asphalt dosage 3%, respectively choose moisture content be 3%, 4%, 5%, 6%, 7%,
8% fancy grade makes 6 groups of test specimens with mineral aggregate, carries out compaction test respectively to 6 groups of test specimens, obtains tamping curve, look for
The first maximum dry density with maximum value on to tamping curve；Again with foamed asphalt dosage 3%, moisture content for the first maximum dry
The fancy grade of water content corresponding to density makes test specimen with mineral aggregate by gyratory compaction method, obtains closest to compaction test
The number of revolutions of the first maximum dry density is determined, then using identified number of revolutions as product parameter, with foamed asphalt
Dosage 3% chooses the fancy grade that moisture content is 3%, 4%, 5%, 6%, 7%, 8% and matches mineral aggregate gyratory compaction side respectively
Legal system makees 6 groups of test specimens, obtains water content-dry density relation curve, and finding has maximum value on water content-dry density relation curve
The second maximum dry density, using the corresponding moisture content of the second maximum dry density as the optimum moisture content of mix-design；
S4, the selection of best foamed asphalt additive amount：The fancy grade matches mineral aggregate under conditions of the optimum moisture content, respectively
2%, 2.3%, 2.6%, 2.9% foamed asphalt additive amount of selection carries out gyratory compaction molding and makes 4 groups of φ 150mm pitches and mix
Material cylinder test specimen is closed, asphalt mixture porosity is carried out to 4 groups of φ 150mm asphalt cylinder test specimens respectively and is resisted
The experiment of Compressive Strength chooses 4 groups of φ 150mm asphalts using compression strength and porosity as index according to test result
Optimal test specimen in cylinder test specimen, the corresponding foamed asphalt additive amount of the optimal test specimen is as best foamed asphalt additive amount；
Wherein, the method for selecting of number of revolutions is as follows in gyratory compaction molding：
The fancy grade under conditions of optimum moisture content, selects 2%, 2.3%, 2.6%, 2.9% bubble respectively with mineral aggregate
Foam pitch additive amount makes 4 groups of test specimens using Marshall method, carries out compaction test respectively to 4 groups of test specimens, selects density most
Big one group；
The fancy grade with mineral aggregate under conditions of the optimum moisture content, with the foam corresponding to maximum one group of the density
The method that pitch additive amount carries out gyratory compaction makes test specimen, obtains the rotation time closest to the determined maximal density of compaction test
Number, which is number of revolutions in gyratory compaction molding；
S5 is pressed with mineral aggregate under conditions of the optimum moisture content and the best foamed asphalt additive amount with the fancy grade
Gyratory compaction method makes test specimen, verifies the dry and wet Ratio of split strength of test specimen, whether freeze-thaw split intensity than meets《Highway asphalt
Pavement recycling technical specification》Requirement, if satisfied, then above-mentioned steps determine proportioning be optimum ratio；Otherwise, return to step S1
Re-start the gradation design of synthesis mixture；
S6 carries out cold in place recycling construction according to the optimum ratio；Wherein, newly gather materials, miberal powder is carried out by the truck spreader that gathers materials
It dispenses, active material and water are to be added in cold regenerative machine in form of slurry, are newly gathered materials, miberal powder, foamed asphalt, active matter
Matter, water and recycling asphalt pavement material form asphalt；
S7, health.
2. the construction method of foamed asphalt cold in place recycling according to claim 1, which is characterized in that before step S6
Further include the steps that evaluating original path, it is specific as follows：
The completion information for collecting original path, specifies original path design objective, to the flexure, design altitude, the volume of traffic of original path into
Row investigation, to determine regeneration scheme；
For flexure do not meet former design standard region carry out local strengthening processing, using mix the materials such as cement, lime into
Row reinforcement, performance indicator meets former design standard requirement after making processing；If foamed asphalt cold renewal layer, need to be to part as face layer
Elevation changes greatly region and is pre-processed, to ensure later stage smooth degree of layer；
To original path be segmented carry out moisture content detection, when changes in environmental conditions causes original path water-cut variation, should again into
Row moisture content detects.
3. the construction method of foamed asphalt cold in place recycling according to claim 1, which is characterized in that step S6 include with
Lower step：
S61 prepares before constructing, material, mechanical admission：
S62 carries out amount of water calculating by asphalt moisture content, the tret newly to gather materials with miberal powder is set in measuring equipment
Parameter, the concentration of cement mortar and fountain height parameter, the fountain height parameter of foamed asphalt；
S63 measures setting-out according to Design for Regeneration drawing, conducts elevation using aluminium alloy, and aluminium alloy, which is positioned over, to be surveyed on pier,
It surveys pier 5m and puts one；
S64 carries out cold in place recycling using cold in place recycling unit, and cold in place recycling unit includes gather materials truck spreader, cement mortar
Vehicle, asphalt truck, cold regenerative machine, paver and road roller, the truck spreader that gathers materials, cement mortar vehicle, asphalt truck, cold renewal
Machine, paver and road roller are arranged in order to form regeneration train groups；Each machinery at the uniform velocity travels, and keeps spacing constant, operating speed
Keep 3-5m/min.
4. the construction method of foamed asphalt cold in place recycling according to claim 3, which is characterized in that cold on the spot in progress
In regenerative process, the tret of each raw material is as follows：New gather materials 61.83kg/m, miberal powder 41.22kg/m, cement 15.45kg/m, water
The tret of 51.53kg/m, foamed asphalt 20.98kg/m, water are remained unchanged in the case where old pipeline material moisture content is constant, if old
Road water-cut variation, the then corresponding adjustment of tret dynamic of water；Wherein, asphalt heating temperature is 155 DEG C, foaming water amount 1.5%.
5. the construction method of foamed asphalt cold in place recycling according to claim 3, which is characterized in that asphalt is again
Raw depth is that face layer is complete thick, milling depth 9-10cm, regeneration zone compacted thickness 12cm.
6. the construction method of foamed asphalt cold in place recycling according to claim 3, which is characterized in that cold on the spot in progress
Include the steps that on road surface and being compacted bituminous mixture laying in regenerative process, it is specific as follows：
Paving for asphalt is carried out using ABG8820 pavers, Paving Techniques are not necessarily to plain asphalt mixture, screed
Heating, arrangement special messenger, which follows, checks whether uniform mixing, if isolation, grey material occurs, hard stop finds reason, excludes event
Barrier rear can proceed with operation；Experimenter spot-check mix moisture content, if being unsatisfactory for requiring, is adjusted in time
It is whole；
It is compacted using double steel wheels and pneumatic-tired rollers combination, wherein dual-steel wheel road roller carries out first pressing and multiple pressure, rubber tire pressure
Road machine carries out final pressure；First pressing should closely follow paver, seal surface layer, avoid moisture evaporation too fast, influence mixture compacting；Double steel wheels
It is 2 that road roller, which uses brave horse HD128, quantity, and 2 dual-steel wheel road rollers respectively roll 5-6 times；Rubber tire selects brave horse GRW280,
It rolls 8 times；Compactness detection is carried out after the completion of rolling immediately, natural Health preservation is carried out after detection is qualified, otherwise carries out ftercompction, until
Until reaching requirement.
7. the construction method of foamed asphalt cold in place recycling according to claim 3, which is characterized in that with cement, fine coal
The slurries that ash and water mix replace the cement mortar；Alternatively, replacing the water with the slurries that flyash and water mix
Mud.
8. the construction method of foamed asphalt cold in place recycling according to claim 1, which is characterized in that in step S7, support
It is raw to use natural Health preservation, when asphalt moisture content is less than 2% or can take out complete core sample, upper layer drip can be carried out
Cyan layer making.
9. according to the construction method of claim 1-8 any one of them foamed asphalt cold in place recycling, which is characterized in that step
In S3, the gyratory compaction angle of test specimen gyratory compaction molding method uses 1.25 °, and vertical pressure selects 600Kpa, rotary speed to adopt
With 30r/min, gyratory compaction makes Compaction Effort with standard compaction test compactive effort, and number of revolutions is 50 times.
10. according to the construction method of claim 1-8 any one of them foamed asphalt cold in place recycling, which is characterized in that step
In rapid S4, the parameter of gyratory compaction molding test specimen is：It is compacted 1.25 °, vertical pressure 600Kpa, rotary speed 30r/min of angle, rotation
It is 50 times to turn number.
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| CN110158388A (en) * | 2019-05-31 | 2019-08-23 | 北京城建远东建设投资集团有限公司 | The process of cement stabilized macadam base cold in place recycling |
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| CN110318319B (en) * | 2019-06-04 | 2021-11-02 | 武汉工程大学 | Thermal regeneration asphalt mixture grading design method based on orthogonal design |
| CN111485468A (en) * | 2020-03-27 | 2020-08-04 | 北京城建远东建设投资集团有限公司 | Premixed foam asphalt base layer and subbase layer in-situ cold regeneration construction method |
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