CN107129196A - A kind of coarse grain formula stress absorption structure layer asphalt and its design method - Google Patents
A kind of coarse grain formula stress absorption structure layer asphalt and its design method Download PDFInfo
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- CN107129196A CN107129196A CN201710466886.2A CN201710466886A CN107129196A CN 107129196 A CN107129196 A CN 107129196A CN 201710466886 A CN201710466886 A CN 201710466886A CN 107129196 A CN107129196 A CN 107129196A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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Abstract
The invention discloses a kind of coarse grain formula stress absorption structure layer asphalt and its design method.The design method comprises the following steps：(1) species of asphalt is selected according to engine request；(2) raw material are selected, and carry out material property test experience；(3) big bitumen aggregate ratio is used, it is determined that rational bitumen aggregate ratio scope, the level for designing mineral aggregate further according to selected each bitumen aggregate ratio is matched somebody with somebody；(4) performance of asphalt is detected；(5) when performance indications whole satisfaction is required in step (4), then mix-design is completed, if performance indications are unsatisfactory for requiring, return and redesign compound, untill satisfaction requirement；(6) result to performance detection is analyzed, and determines the optimum oil-stone ratio scope and grading limit of the asphalt.Described coarse grain formula stress absorption structure layer asphalt plays a part of stress absorption structure layer, with the multi-functional such as waterproof anticracking, antifatigue, preventing and treating reflection crack.
Description
Technical field
The present invention relates to field of road, more particularly to a kind of coarse grain formula stress absorption structure layer asphalt and its
Design method.
Background technology
In recent years, with social development and the continuous improvement of living standards of the people, volume of traffic rapid growth, people are to road
Use requirement also more and more higher.In the high-grade highway that China builds at present frequently with sub-surface form be semi-rigid base
Layer, but Pavement on Semi-rigid Type Base easily produces reflection crack at temperature and the collective effect of load, and this is to cause semi-rigid base
Layer bituminous paving produces one of major reason of early damage.The another kind of situation for reflection crack easily occur is mixed in old cement
Laying Asphalt Surface Course on solidifying soil surface.Cement concrete pavement is through use after a while, it may appear that different degrees of damage.
Paving Bituminous Concrete surface layer (being commonly called as " morning-night "), can improve making for cement concrete pavement on cement concrete pavement
With function, improve the flatness on road surface, extend the service life of cement pavement.But domestic and international substantial amounts of engineering practice shows, by
It is plate structure in Old cement concrete, as the road occupation time increases, the asphalt surface course of overlay is in load and temperature
Also easily occur reflection crack under effect, cause the problems such as pavement life shortens.Semi-rigid asphalt pavement and coagulating cement
The reflection crack and warm plastic forming problem of soil surface repaving asphalt coat are always a technical barrier of road circle.Reflection crack is arrived
The destruction of road is not only only that crack problem, it is often more important that after cracking initiation moisture will by oozed under gap influence basic unit and
The intensity of roadbed, so as to influence the performance and service life of road.
Therefore, preventing or slowing down generation and the hair of reflection crack frequently with the mode of setting stress absorbing layer in engineering
Exhibition.Conventional stress absorbing layer has a variety of at present, and such as Strata stress absorbing layers, lowest level by emulsion pitch, high resiliency are modified drip
Blue or green concrete stress absorbing layer, Sampave stress absorbing layers etc..But presently used stress absorbing layer its common feature is：On road
In the structure of face, stress absorbing layer is only used as a simple one functional layer, and it is only to prevent reflective crack and prevent earth's surface that it, which is acted on,
Ooze under water.And frequently with sand grains formula asphalt, its rutting resistance is poor, it is impossible to be used as road surface structare layer.Paving thickness
Generally 2cm~2.5cm, construction gets up relatively difficult, and effect of prestressed is undesirable.And various stress absorbing layers are using process
In various diseases can all occur, such as when conventional stress absorbing layer is set, produces weak intercalated layer because constructing the factor such as bad and show
As etc..Engineering practice simultaneously shows, if stress absorbing layer selection is improper or sets bad, may accelerate the production in crack on the contrary
It is raw.
The content of the invention
The primary and foremost purpose of the present invention is to overcome the shortcoming and deficiency of prior art, and there is provided a kind of coarse grain formula stress absorption knot
The design method of structure layer asphalt.
Another object of the present invention is to provide the asphalt being made by described design method.
A further object of the present invention is the application for providing the asphalt.
The purpose of the present invention is achieved through the following technical solutions：A kind of coarse grain formula stress absorption structure layer asphalt
Design method, includes species, selection raw material, mix-design and the performance detection of selection asphalt, specifically include as
Lower step：
(1) species of asphalt is selected：The layer pitch mixing of coarse grain formula stress absorption structure is selected according to engine request
The species of material；
(2) raw material are selected：The raw material include coarse aggregate, fine aggregate, miberal powder and pitch, select the raw material
Afterwards, material property test experience is carried out；
(3) mix-design：Using big bitumen aggregate ratio, then determine to close by 1% spacing according to the purposes of asphalt
The bitumen aggregate ratio scope of reason, ore deposit is carried out further according to selected each bitumen aggregate ratio with CAVF methods (the main aggregate voidage completion method of mineral aggregate)
The design that material level is matched somebody with somebody；
(4) performance detection：Detect the performance of the coarse grain formula stress absorption structure layer asphalt；
(5) when performance indications whole satisfaction is required in step (4), then mix-design is completed, if performance indications are discontented
Foot requires and (even has the performance indications of the corresponding asphalt of some bitumen aggregate ratio to be unsatisfactory for requiring), then returns to the 2nd step and start,
Compound is redesigned, changes the composition of raw material or changes level and match somebody with somebody, repeat step (2), (3) and (4) is required until meeting
Untill, complete the design of the coarse grain formula stress absorption structure layer asphalt；
(6) result to performance detection in step (4) is analyzed, and determines the coarse grain formula stress absorption structure layer pitch
The optimum oil-stone ratio scope and grading limit of compound.
Different types of pitch and different rule may be selected according to engineering actual demand in asphalt described in step (1)
The building stones (coarse aggregate and fine aggregate) of lattice, and the asphalt is big bitumen aggregate ratio framework dense structure；Wherein, big bitumen aggregate ratio is
Close mineral aggregate gradation plain asphalt compound bitumen aggregate ratio (close mineral aggregate gradation plain asphalt compound bitumen aggregate ratio is about 3.8%~
6.2%) 110%~300%, depending on design and requirement of engineering.
The nominal maximum aggregate size root of building stones used in coarse grain formula stress absorption structure layer asphalt described in step (1)
The types such as 13mm, 16mm, 20mm or 25mm generally may be selected according to engine request.
Coarse aggregate, fine aggregate and miberal powder described in step (2) according to《Highway engineering is gathered materials testing regulations》(JTG E42-
2005) tested, and met《Standard specification for construction and acceptance of highway asphalt pavement》(JTG F40-2004) requirement.
Pitch described in step (2) is preferably rubber asphalt, modified pitch or high-viscosity modified asphalt；Described pitch
According to《Highway engineering pitch and Asphalt Mixture Experiment code》(JTG E20-2011) carries out performance detection to pitch, and meets
《Standard specification for construction and acceptance of highway asphalt pavement》(JTG F40-2004) requirement.
Described rubber asphalt is preferably prepared via a method which to obtain：Rubber powder is added into matrix pitch to carry out instead
Should, obtain rubber asphalt；Wherein, matrix pitch is 82 in mass ratio with rubber powder：18 proportionings.
Coarse aggregate described in step (2) is the one or more in diabase, granite and limestone；Preferably brightness is green
Rock.
Fine aggregate described in step (2) is the one or more in diabase, granite and limestone；Preferably spend hilllock
Rock.
Raw material described in step (2) additive also including fiber etc., addition fiber is to prevent construction analysis leakage.
Big bitumen aggregate ratio described in step (3) for close mineral aggregate gradation plain asphalt compound bitumen aggregate ratio 110%~
300%, depending on design and requirement of engineering, to improve the stretcher strain ability of compound；Preferably 6.4%~
12.4%；More preferably 9.5%~11.5%.
Mineral aggregate gradation described in step (3) is designed as coarse aggregate according to correlation engineering Experience Design, and fine aggregate is by Thailand
Wave index n=0.5 is designed.
The number of bitumen aggregate ratio described in step (3) is preferably 5~9, more preferably 7.
Mix-design described in step (3) is preferably realized by the following method：First determine the big oilstone of asphalt
The scope (being determined according to engineering experience) of ratio, then designs thickness using CAVF methods and gathers materials (coarse aggregate and fine aggregate)
Relative scale is to ensure the framework dense structure of mineral aggregate, and wherein coarse aggregate is designed according to conventional engineering experience, and fine aggregate presses safe ripple
Index n=0.5 is designed, and fine aggregate can be made tightly to fill, and density is maximum, and voidage is minimum, fine aggregate is integrally had larger cohesive strength
And compactness；Each adaptive different mineral aggregate gradations of each bitumen aggregate ratio are determined again to carry out the experiment of compound, draw performance most
Good combination, using this aggregate grading design, method is simple, asphalt formation framework dense structure is can ensure that, with excellent
The pavement performances such as good high-temperature stability, fatigue performance, crack resistance at low-temperature and water stability.
According to performance detection described in step (4)《Highway engineering pitch and Asphalt Mixture Experiment code》(JTG
E20-2011 the performance detection of asphalt) is carried out.
Described performance detection includes Marshall stability test, wheel tracking test, (immersion Marshall is stable for immersion Marshall
Degree) experiment, indirect tensile test on frozen-thaw, girder bend test, prism uniaxial compression test and the fatigue test of asphalt.
Performance indications described in step (5), which are met, to be required to meet for performance indications《Asphalt highway construction technology is advised
Model》The requirement of (JTG F40-2004).
A kind of asphalt, is made by the design method described in any of the above-described.
Described asphalt is thickness framework structure, designs to be formed by using volume completion method, specific method is such as
Under：Stonestone frame structure is initially formed with coarse aggregate；Fine aggregate, miberal powder and pitch and fiber additive are filled into stonestone frame again
The space of structure (thick skeleton) forms framework dense structure, and the checking index of described skeleton is VCAmix≤VCADRC(compacting shape
Under state in asphalt coarse aggregate voidage VCAmixLess than or equal to the voidage VCA of coarse aggregate under tamping stateDRC),
Now asphalt is thickness framework structure.
Application of the described asphalt in field of road.
Application of the described asphalt in road surface structare layer and/or stress absorbing layer.
Described road surface structare layer is the bottom surface layer or semi-rigid asphalt pavement knot of old cement concrete road repaving asphalt coat
Layer below structure.
The paving design thickness of described road surface structare layer is preferably 3~10cm, should as that can be played while structure sheaf
The effect of power absorbed layer.
The present invention has the following advantages and effect relative to prior art：
1st, a kind of coarse grain formula stress absorption structure layer asphalt of the present invention, because this coarse grain formula stress is inhaled
The height for receiving structure sheaf asphalt glues characteristic and framework dense structure, while high-temperature stability is ensured, in low temperature condition
It is lower to make it that both there is good resistance rutting deformation ability again with larger deformability, have stretcher strain ability strong again
The characteristics of with antifatigue good endurance.Therefore, this multi-functional big bitumen aggregate ratio asphalt is overlayed available for old cement concrete road
The bottom surface layer of bitumen layer, or as layer below semi-rigid base asphalt pavement structure, design thickness rises up to 3~10cm
To the effect of stress absorption structure layer, while having the multi-functional such as waterproof anticracking, antifatigue, preventing and treating reflection crack.Overcome
Conventional sand grains formula stress absorbing layer Rut resistance deformability is poor, and design thickness is thin (usual 2~2.5cm), it is difficult to which uniform pave is applied
The shortcoming of work；And the more conventional sand grains formula stress absorption thickness of coarse grain formula stress absorbing layer thickness is much, effect of anti-cracking is also carried significantly
It is high.
2nd, coarse grain formula stress absorption structure layer asphalt of the invention has the following advantages：(1) existing very strong carrying
Ability, can play again prevent reflection crack be used as stress absorption structure layer；(2) there is good synthesis pavement performance
With rutting deformation resistance is strong, stretcher strain ability is strong, effect of prestressed is good, reduction road rumble etc.；(3) in thinned asphalt road
There is obvious advantage in terms of face thickness, resistance heavy traffic and bad climate；(4) good engineer applied effect can be received,
Working procedure can be simplified simultaneously, shorten the duration, engineering overall cost is reduced.
3rd, species, raw material, mix-design and the performance evaluation of present invention selection asphalt and checking etc., wherein
This coarse grain formula stress absorption structure layer asphalt is designed to form dense skeleton using volume completion method, i.e. coarse aggregate is formed
The space that stonestone frame structure, fine aggregate, miberal powder and pitch and fiber additive etc. just fill thick skeleton forms framework compact
Structure, its middle skeleton checking index is VCAmix≤VCADRC, under compaction state in compound coarse aggregate voidage VCAmixIt is less than
Equal to the voidage VCA of coarse aggregate under tamping stateDRC.This coarse grain formula stress absorption structure layer asphalt is necessary simultaneously
(it is usually the 110%~300% of close mineral aggregate gradation plain asphalt compound bitumen aggregate ratio, with specific reference to setting using big bitumen aggregate ratio
Depending on meter and requirement of engineering), to improve the stretcher strain ability of compound, the effect that enhancing stress dissipates plays " stress suction
The effect of receipts " and waterproof anticracking.Pitch can select rubber asphalt or modified pitch, can also use high-viscosity modified asphalt, necessary
When can add the technical measures such as fiber prevent construction analysis leakage.Experimental studies results show, this coarse grain formula stress absorption structure layer
The existing good resistance rutting deformation ability of asphalt, has stretcher strain ability strong and antifatigue good endurance spy again
Point.
4th, framework dense structure asphalt of the present invention has compactness, strength and stability all preferably special
Property, ensure its corner angle so gathering materials to try one's best used in compound, reduce gill shape building stones content, so as to ensure framework compact
Structure, it is to avoid form suspension compact structure influence compound high-temperature stability；When simultaneously to aggregate grading design, using CAVF methods
Relative scale that thickness gathers materials is designed to ensure the framework dense structure of mineral aggregate, wherein thick bone is set according to conventional engineering experience
Meter.Fine aggregate presses safe wave index n=0.5 designs, and fine aggregate can be made tightly to fill, and density is maximum, and voidage is minimum, makes fine aggregate overall
With larger cohesive strength and compactness.
5th, big bitumen aggregate ratio and respective mineral aggregate gradation determined by the present invention in mix-design, according to《Highway work
Journey pitch and Asphalt Mixture Experiment code》Experimental Standardization in (JTG E20-2011) makes test specimen and carries out pitch mixing
The Marshall stability test of material, wheel tracking test, immersion Marshall stability test, indirect tensile test on frozen-thaw, girder bend test,
Prism uniaxial compression test and the fatigue test of asphalt are to this coarse grain formula stress absorption structure layer asphalt
Pavement performance detected, finally determine coarse grain formula stress absorption structure layer asphalt optimum oil-stone ratio scope
And grading limit.
Brief description of the drawings
Fig. 1 is the process flow diagram of coarse grain formula stress absorption structure layer asphalt of the present invention.
Fig. 2 be under low-temperature condition (- 10 DEG C) and normal temperature state (15 DEG C), the rubber-asphalt mixture of different bitumen aggregate ratios with
The relationship change curve map of bending tensile strength.
Fig. 3 be under low-temperature condition (- 10 DEG C) and normal temperature state (15 DEG C), the rubber-asphalt mixture of different bitumen aggregate ratios with
The relationship change curve map of maximum flexural-tensile strain.
Fig. 4 be under low-temperature condition (- 10 DEG C) and normal temperature state (15 DEG C), the rubber-asphalt mixture of different bitumen aggregate ratios with
The relationship change curve map of bending-type panel.
Fig. 5 is the prismatic compressive strength comparison diagram of the rubber-asphalt mixture under different rubber asphalt consumptions.
Compression strain statistical chart when Fig. 6 is the test specimen destruction of the rubber-asphalt mixture under different rubber asphalt consumptions.
Fig. 7 is the compression stiffness modulus statistical chart of the rubber-asphalt mixture under different rubber asphalt consumptions.
Embodiment
With reference to embodiment, the present invention is described in further detail, but the implementation of the present invention is not limited to this.
Embodiment 1
Using a kind of big bitumen aggregate ratio framework compact rubber-asphalt mixture as stress absorption structure, layer is designed as the present embodiment
Example, is comprised the following steps that：
1st, the species of asphalt is selected according to engine request, as a kind of big bitumen aggregate ratio framework compact rubber asphalt is mixed
Close material.
2nd, raw material selection and performance test；
Rubber asphalt：Be in matrix pitch add rubber powder (mass ratio of matrix pitch and rubber powder be 82：18) exist
Made from being reacted in stirring container.Wherein, rubber asphalt basic performance is as shown in table 1.
The coarse aggregate of framework compact rubber-asphalt mixture uses diabase, and fine aggregate uses granite, wherein coarse aggregate
Grading limit be 13.2,9.5 and 4.75mm (square hole particle diameter), apparent relative density is 2.718g/cm3；The level of fine aggregate is matched somebody with somebody
Scope is 0.075,0.15,0.3,0.6 and 1.18mm, 2.36mm (square hole particle diameter)；Apparent relative density is 2.650g/cm3.Its
In, the basic performance detection gathered materials is as shown in table 2.
Inserts selects miberal powder, and apparent relative density is 2.831t/m3, wherein, miberal powder indices are as shown in table 3.
The rubber asphalt basic performance of table 1
The basic performance detection that table 2 gathers materials
The miberal powder indices of table 3
Above-mentioned pitch according to《Highway engineering pitch and Asphalt Mixture Experiment code》(JTG E20-2011) enters to pitch
Row performance detection；Gather materials with miberal powder according to《Highway engineering is gathered materials testing regulations》(JTG E42-2005) is tested.By detecting
As a result it can be seen that, rubber asphalt, the indices of thick, fine aggregate and miberal powder meet《Standard specification for construction and acceptance of highway asphalt pavement》
(JTG F40-2004) asphalt surface course gathers materials the regulations of technical requirements.
3rd, mix-design：Using big bitumen aggregate ratio, (big bitumen aggregate ratio is close mineral aggregate gradation plain asphalt compound bitumen aggregate ratio
110%~300%), due to it is designed be the rubber-asphalt mixture of big bitumen aggregate ratio, according to single mineral aggregate gradation not
It can make compound under each asphalt content can be into framework dense structure, so that its performance difference is larger.So what is used matches somebody with somebody
Composition and division in a proportion design method for first according to engineering experience and the purposes of compound by 1% spacing determine 7 it is relatively large
Bitumen aggregate ratio, i.e., 6.4%, 7.4%, 8.4%, 9.4%, 10.4%, 11.4%, 12.4%, then further according to each bitumen aggregate ratio
The design of mineral aggregate gradation is carried out with CAVF methods (the main aggregate voidage completion method of mineral aggregate), wherein coarse aggregate is passed through according to conventional engineering
Test design.Fine aggregate presses safe wave index n=0.5 designs, and fine aggregate can be made tightly to fill, and density is maximum, and voidage is minimum, makes fine aggregate
It is overall that there is larger cohesive strength and compactness.Framework dense structure is formed to ensure.
The detailed design procedure of CAVF methods is as follows：
(1) main aggregate (coarse aggregate) gradation composition is designed according to conventional engineering experience and utilizes Taboo function (1-1) n=
Fine aggregate gradation composition is designed when 0.5.
P=(d/D)n×100 (1-1)
In formula：P-aggregate particle passes through percentage (%) on screen size d；
The screen size of the d-middle particle that gathers materials, unit is mm；
The maximum particle diameter for D-gather materials, unit is mm；
N grading indexes, this method recommends grading index n=0.5.
(2) constituted according to the main grading of aggregates of design, coarse aggregate is mixed in the ratio of determination, pressed《Highway work
Journey is gathered materials testing regulations》T0304 test method determines the bulk density ρ of coarse aggregate in (JTG E42-2005)b.This research
The ρ of coarse aggregate usedb=2.656g/cm3。
(3) according to《Highway engineering is gathered materials testing regulations》T0309 test method determines pitch in (JTG E42-2005)
Bulk density ρ=1.607g/cm of the compound under coarse aggregate skeleton tamping state3, recycle formula (1-2) to calculate tamping shape
Coarse aggregate skeleton clearance rate VCA under stateDRC.The coarse aggregate skeleton clearance rate that this research institute is calculated with coarse aggregate under tamping state
VCADRC=39.5%.
VCADRC=(1- ρ/ρb)×100 (1-2)
In formula：Bulk density under ρ-coarse aggregate skeleton used for asphalt mixture tamping state, unit is g/cm3；
ρbThe bulk density of-coarse aggregate, unit is g/cm3。
(4) according to《Highway engineering is gathered materials testing regulations》T0304 test method is determined respectively in (JTG E42-2005)
The apparent relative density ρ of coarse aggregateacWith bulk specific gravity ρbc, fine aggregate apparent relative density ρaf, rubber asphalt it is relative
Density p a.And the relative density ρ of miberal powderf.ρ in this researchac=2.738g/cm3, ρbc=2.656g/cm3, ρaf=2.720g/
cm3, ρ a=1.032g/cm3, ρf=2.831g/cm3。
(5) consumption of miberal powder, pitch is rule of thumb primarily determined that, and according to different function requirements, with reference to dense bitumen
Concrete mixture Marshall Test technical standard, determines the design object voidage Vv of asphalt.This research takes miberal powder
Consumption qpFor 3%, Asphalt Mixture Design objective air void Vv is 4.5%, bitumen aggregate ratio is respectively 6.4%, 7.4%, 8.4%,
9.4%th, 10.4%, 11.4% and 12.4%, so as to draw each bitumen aggregate ratio corresponding asphalt content (asphalt content=oilstone
Than/(1+ bitumen aggregate ratios)).
(6) simultaneous formula (1-3) and formula (1-4) solve coarse aggregate content qcWith fine aggregate consumption qf：
qc+qf+qp=100 (1-3)
qc/(100×ρ)·(VCADRC- Vv)=qf/ρaf+qp/ρf+qa/ρa(1-4)
In formula:qc- coarse aggregate content percentage (%)；
qf- fine aggregate usage percentage (%)；
qp- miberal powder usage percentage (%)；
qa- asphalt content percentage (%)；
VCADRCCoarse aggregate skeleton clearance rate (%) under-tamping state；
Vv-Asphalt Mixture Design objective air void (%)；
Bulk density under ρ-coarse aggregate skeleton tamping state, unit is g/cm3；
ρafThe apparent relative density of-fine aggregate, unit is g/cm3；
ρfThe relative density of-miberal powder, unit is g/cm3；
ρaThe relative density of-pitch, unit is g/cm3。
(7) according to above-mentioned mineral aggregate gradation composition design method and mineral aggregate density parameter, each oilstone in this research is finally determined
The ratio gathered materials than thickness used is shown in Table 4.
Each bitumen aggregate ratio thickness of table 4 is gathered materials ratio
Match somebody with somebody with reference to the fine aggregate level that the level for the coarse aggregate that conventional engineering experience is determined is matched somebody with somebody during with Taboo function n=0.5 and (be shown in Table
5) design level of each bitumen aggregate ratio can, be calculated with as shown in table 6.
The coarse aggregate of table 5, the gradation composition of fine aggregate
Each bitumen aggregate ratio mineral aggregate gradation composition of table 6
4th, basis《Highway engineering pitch and Asphalt Mixture Experiment code》(JTG E20-2011) is to above-mentioned each component rubber
The Marshall stability test of glue asphalt progress asphalt, wheel tracking test, immersion Marshall stability test, jelly
Melt diametral compression test, girder bend test, prism uniaxial compression test etc..Experimental result is as shown in table 7~11 and Fig. 2~7.
Every volume index of the marshal piece of table 7
Because the target of design is that the closely knit asphalt of design framework makes it have more excellent pavement performance, therefore must
The judgement of framework dense structure must be carried out to it.As the voidage VCA of coarse aggregate in compound under compaction stateMIXIt is less than or equal to
The voidage VCA of coarse aggregate under tamping stateDRCWhen, compound is thick bone in compound under framework dense structure, compaction state
The voidage VCA of materialMIXCalculated by formula (2-1)：
VCAMIX=100 (γf/ρbc×PCA) (2-1)
In formula：VCAMIXUnder-compaction state in asphalt coarse aggregate voidage (%)；
γfThe bulk specific gravity of-asphalt, unit is g/cm3；
ρbcThe synthesis bulk specific gravity of-coarse aggregate, unit is g/cm3；
PCAThe ratio (%) of coarse aggregate in-asphalt.
By calculating, the VCA of the bitumen aggregate ratio of each in the present embodiment (6.4%~12.4%)mixRespectively 35.5%,
35.3%th, 35.4%, 35.1%, 34.6%, 34.3% and 34.4%.The VCA of each bitumen aggregate ratio asphaltmixRespectively less than
VCADRC(39.5%) rubber-asphalt mixture, therefore in this research is framework dense structure.
The Marshall stability test result of table 8
The wheel tracking test dynamic stability of table 9
It can be seen that from the result of the test of Marshall stability test, with the increase of bitumen aggregate ratio, the Marshall of test specimen is stable
Angle value is gradually reduced, but the Marshall stability value of substantially all mix-designs is both greater than 8k N, is met《Highway asphalt road
Surface construction technical specification》Marshall stability technical standard in (JTG F40-2004) under summer hot area's Heavy Traffic.
And flow valuve is also between 20~40 (0.1mm), the technical standard in specification is met.The wheel tracking test result of rubber-asphalt mixture
It has been shown that, even if bitumen aggregate ratio is increased into 12.4%, its dynamic stability remains to be maintained at more than 2500.This illustrates big bitumen aggregate ratio skeleton
The rubber-asphalt mixture of compact-type has good high-temperature stability.
The immersion Marshall test result of table 10
The indirect tensile test on frozen-thaw result of table 11
Immersion residual stability from immersion Marshall test and the results showed that test specimen of indirect tensile test on frozen-thaw is basic
All more than 85% (technical requirements of humid area modified asphalt mixture immersion residual stability), and when bitumen aggregate ratio is
When 11.4%, even more than 100%.The stability after 48h is incubated i.e. in Water Tank with Temp.-controlled and has exceeded the stabilization being incubated in 30min
Degree, it may be possible to when specimen molding caused by produced difference.This is can consider from the result of the test of immersion Marshall test
The water stability of series rubber asphalt is preferable.And the freeze-thaw split strength ratio of test specimen is with the increase of asphalt content
Increase, substantially all more than 80%, when bitumen aggregate ratio increases to 12.4%, freeze-thaw split strength ratio reaches 98.3%.Accord with completely
Close China《Standard specification for construction and acceptance of highway asphalt pavement》It is stable to moist area's modified asphalt mixture water in (JTG F40-2004)
The technical standard of property.
Fig. 2~7 are girder bend test and prism uniaxial compression test：
It can be observed from fig. 2 that for the rubber-asphalt mixture of each bitumen aggregate ratio, -10 DEG C of bending tensile strength compared with
15 DEG C have different degrees of raising, are substantially all and improve twice or more than twice.This explanation, the reduction of temperature is improved
Girder bending tensile strength.
As seen from Figure 3,15 DEG C of flexural-tensile strains of the rubber-asphalt mixture under each asphalt content are controlled 15000 substantially
Between~35000 μ ε, -10 DEG C of flexural-tensile strains are controlled between 3000~5000 μ ε substantially.Although -10 DEG C of flexural-tensile strain is compared with 15
DEG C 5~7 times are reduced, but its flexural-tensile strain value is still larger, meets《Standard specification for construction and acceptance of highway asphalt pavement》(JTG
F40-2004 technical requirements (3000 μ ε) of the modified asphalt mixture in the low temperature bend test failure strain in winter severe cold area in).
This illustrates that this serial rubber-asphalt mixture still has preferable deformability at low ambient temperatures.
From fig. 4 it can be seen that during low-temperature condition (- 10 DEG C), the bending-type panel of compound is left in 1500~3000MPa
The right side, and during normal temperature state (15 DEG C), the bending-type panel of compound is complete in below 300MPa.This shows that rubber asphalt is mixed
Expect that the flexibility under low temperature and normal temperature state is preferable.And the bending-type panel of -10 DEG C and 15 DEG C of compound differs greatly, -
10 DEG C of bending-type panel compared with 15 DEG C all increases 10~20 times substantially.Therefore, resistance cold cracking and reflection crack side
Face, this serial rubber-asphalt mixture all has good performance.
It is seen from fig 5 that under different rubber asphalt consumptions, prismatic compressive strength phase of the compound at 20 DEG C and 15 DEG C
Difference is very few, and still -10 DEG C of prismatic compressive strength is then larger, substantially its correspondence bitumen aggregate ratio pressure resistance in 20 DEG C and 15 DEG C
3 times or so of degree.
As seen from Figure 6, the destruction compression strain of rubber-asphalt mixture reduces with the decline of temperature substantially.Mixing
The bitumen aggregate ratio of material is bigger, and it is also bigger that it destroys compression strain.Even if but at low ambient temperatures, compression when compound is destroyed should
Become also in 20000 microstrains or so.Compared with girder bend test, in identical load speed and identical test temperature conditionss
Under, compression failure strain is higher by several times than maximum flexural-tensile strain.This is due to that, in tension test, the glutinous of asphalt binder gathers
Power is in its dominating role；And in compression test, in addition to the deformation effect of pitch, mineral aggregate intensity in itself, the interlocking of mineral aggregate
Bearing capacity plays very big effect, and can produce certain relative displacement.
It will be seen in fig. 7 that no matter under which kind of temperature environment, with the increase of rubber asphalt consumption, the compression of compound
Stiffness modulus is in the trend reduced substantially.And -10 DEG C of compression stiffness modulus is 5~6 times that stiffness modulus is compressed under normal temperature.
From the rubber drip under each asphalt content of results showed that of girder bend test and prism uniaxial compression test
The flexural-tensile strain and destruction compression strain of blue or green compound increase with the increase of bitumen aggregate ratio.15 DEG C of flexural-tensile strains are controlled substantially
Between 15000~35000 μ ε, compression strain is controlled between 30000~60000 μ ε substantially, and -10 DEG C of flexural-tensile strains are controlled substantially
System is between 3000~5000 μ ε, and compression strain when compound is destroyed is also in 20000 microstrains or so.Comply fully with《Highway
Asphalt Pavement Construction Technique specification》Low temperature bend test of the modified asphalt mixture in winter severe cold area in (JTG F40-2004)
The technical requirements (3000 μ ε) of failure strain.Prism uniaxial compression test also demonstrate that in resistance cold cracking and reflection crack
Aspect, this serial rubber-asphalt mixture all has good performance.
5 kinds of typical stress absorbing layers are tested simultaneously, their own maximum flexural-tensile strain and energy to failure is measured
Deng evaluating their cryogenic property.Test basis《Highway engineering pitch and Asphalt Mixture Experiment code》(JTG E20-
2011) asphalt bend test specification, -10 DEG C of girder bend tests are carried out with UTM-25, and test data is as shown in table 12.
Described 5 kinds typical stress absorption Rotating fields each use optimal cementitious matter consumption, and most preferably gather materials consumption etc., to each of which
Composition be summarized as follows：
Wherein rubber asphalt stress absorbing layer is prepared by this experiment component 6 (bitumen aggregate ratio is 11.4%).Emulsification drip
Blue or green Sub-sealing Course is made up of emulsified asphalt and gathering materials, and Asphalt emulsion content is 1.5kg/m2Left and right, specification of gathering materials be 2.36~
4.75mm, consumption is 6m3/(1000m2) left and right.GSZ stress absorbing layer is by emulsified asphalt, GSZ and group of gathering materials
Into Asphalt emulsion content is about 0.8kg/m2Left and right, specification of gathering materials is 2.36~4.75mm, and consumption is 10kg/m2Left and right.Polyester
Glass-fiber-fabric stress absorbing layer is made up of SBS modified pitch and Fibergrass polyester mat, and asphalt content is about 1.0kg/m2Left and right.
Strata stress absorbing layers are made up of polymer modification cementitious matter and gathering materials, and cementitious matter PG grades are PG82-28, asphalt content
The 8%~10% of compound is constituted about, the nominal maximum aggregate size that gathers materials is 4.75mm.
The different type stress absorbing layer low temperature the small beam experiment result of table 12
Maximum flexural-tensile strain and energy to failure can be seen that by table 12, except Strata stress absorbing layers are relatively better than rubber asphalt
Outside stress absorbing layer, rubber asphalt stress absorbing layer is all higher than other stress absorbing layers, it is clear that rubber asphalt stress absorbing layer
Cryogenic property is significantly better than that other stress absorbing layers in addition to Strata stress absorbing layers.And maximum flexural-tensile strain reaches
4992.81 μ ε, considerably beyond《Standard specification for construction and acceptance of highway asphalt pavement》Modified asphalt mixture exists in (JTG F40-2004)
The technical requirements (3000 μ ε) of the low temperature bend test failure strain in winter severe cold area.
The test result analysis of summary experiment, to component 6 in every respect all with superperformance, (bitumen aggregate ratio is
11.4%) rubber-asphalt mixture carries out fatigue test to analyze its fatigue behaviour, and with other kinds of dense gap-graded
Asphalt mixture fatigue testing result is analyzed, and the level of other types asphalt is with being shown in Table 13, and final contrast is tied
Fruit is as shown in table 14.
The gradation composition of the other types asphalt of table 13
The rubber-asphalt mixture experiment on fatigue properties statistical result of table 14
From table 14 it is apparent that when strain level be 200 and 400 microstrain when, except SBS modified asphalt mixtures
The a little higher than component 6 of loaded cycle number of times (bitumen aggregate ratio is 11.4%) outside, the fatigue life of other compounds is below component 6
(bitumen aggregate ratio is 11.4%), when strain level is 600 microstrain, the fatigue life highest of component 6 (bitumen aggregate ratio is 11.4%),
The fatigue life of other asphalts is below the fatigue life of component 6 (bitumen aggregate ratio is 11.4%), illustrates this serial rubber
Glue asphalt has good anti-fatigue performance.
According to the technical indicator of above-mentioned every experiment, substantially met in guarantee rubber-asphalt mixture as stress absorbing layer
On the premise of limiting strain, at the same when asphalt is as structure sheaf the required anti-rut behavior having and water stability will
Ask, to prevent the possibility of the destructions such as rut or peeling.Consider this result of the test, therefore recommend the optimal pitch of use
Amount ranges are：Bitumen aggregate ratio is between 9.5%~11.5%.Now compound effective bitumen film thickness is 22~24 μm, mineral aggregate
Clearance rate is 21% or so, and voidage is 1% or so, meets the various indexs as stress absorbing layer.
Use on the good synthesis road that possesses of this multi-functional big bitumen aggregate ratio framework compact rubber-asphalt mixture of summary
Performance, available for the bottom surface layer of old cement concrete road repaving asphalt coat, or as semi-rigid base asphalt pavement structure below
Layer, design thickness plays a part of stress absorption structure layer up to 3~10cm, while having waterproof anticracking, antifatigue, preventing and treating
The multi-functionals such as reflection crack.The step of being separately provided stress absorbing layer is eliminated, construction technology is simplified, shortens the duration；For
Engineering construction is brought convenience；Construction costs is also saved, good engineer applied effect is received in practice.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of design method of coarse grain formula stress absorption structure layer asphalt, it is characterised in that comprise the following steps：
(1) species of asphalt is selected：Coarse grain formula stress absorption structure layer asphalt is selected according to engine request
Species；
(2) raw material are selected：The raw material include coarse aggregate, fine aggregate, miberal powder and pitch, select after the raw material, enter
Row material property test experience；
(3) mix-design：Using big bitumen aggregate ratio, then determined according to the purposes of asphalt by 1% spacing rational
Bitumen aggregate ratio scope, the design of mineral aggregate gradation is carried out further according to selected each bitumen aggregate ratio with CAVF methods；
(4) performance detection：Detect the performance of the coarse grain formula stress absorption structure layer asphalt；
(5) when performance indications whole satisfaction is required in step (4), then mix-design is completed, if performance indications are unsatisfactory for wanting
Ask, then return to the 2nd step and start, redesign compound, change the composition of raw material or change level and match somebody with somebody, repeat step (2),
(3) and (4), untill meeting and requiring, the design of the coarse grain formula stress absorption structure layer asphalt is completed；
(6) result to performance detection in step (4) is analyzed, and determines the coarse grain formula stress absorption structure layer pitch mixing
The optimum oil-stone ratio scope and grading limit of material.
2. the design method of coarse grain formula stress absorption structure layer asphalt according to claim 1, it is characterised in that：
Big bitumen aggregate ratio described in step (3) is the 110%~300% of close mineral aggregate gradation plain asphalt compound bitumen aggregate ratio；Step
(3) fine aggregate that is designed as of the mineral aggregate gradation described in is designed by safe wave index n=0.5.
3. the design method of coarse grain formula stress absorption structure layer asphalt according to claim 1, it is characterised in that：
Big bitumen aggregate ratio described in step (3) is 6.4%~12.4%；The number of bitumen aggregate ratio described in step (3) is 5~9.
4. the design method of coarse grain formula stress absorption structure layer asphalt according to claim 1, it is characterised in that：
Pitch described in step (2) is rubber asphalt, modified pitch or high-viscosity modified asphalt；
Coarse aggregate described in step (2) is the one or more in diabase, granite and limestone；
Fine aggregate described in step (2) is the one or more in diabase, granite and limestone；
Raw material described in step (2) also include fiber additive.
5. the design method of coarse grain formula stress absorption structure layer asphalt according to claim 4, it is characterised in that
Described rubber asphalt is prepared via a method which to obtain：Rubber powder is added into matrix pitch to be reacted, and obtains rubber drip
It is blue or green；Wherein, matrix pitch is 82 in mass ratio with rubber powder：18 proportionings.
6. the design method of coarse grain formula stress absorption structure layer asphalt according to claim 1, it is characterised in that：
Coarse aggregate, fine aggregate and miberal powder described in step (2) according to《Highway engineering is gathered materials testing regulations》(JTG E42-
2005) tested, and met《Standard specification for construction and acceptance of highway asphalt pavement》(JTG F40-2004) requirement；
Pitch described in step (2) according to《Highway engineering pitch and Asphalt Mixture Experiment code》(JTG E20-2011) is right
Pitch carries out performance detection, and meets《Standard specification for construction and acceptance of highway asphalt pavement》(JTG F40-2004) requirement；
According to performance detection described in step (4)《Highway engineering pitch and Asphalt Mixture Experiment code》(JTG E20-
2011) performance detection of asphalt is carried out；
Performance indications described in step (5), which are met, to be required to meet for performance indications《Standard specification for construction and acceptance of highway asphalt pavement》
The requirement of (JTG F40-2004).
7. the design method of coarse grain formula stress absorption structure layer asphalt according to claim 1, it is characterised in that：
Performance detection described in step (4) includes Marshall stability test, wheel tracking test, immersion Marshall test, freeze-thaw split
Experiment, girder bend test, prism uniaxial compression test and the fatigue test of asphalt.
8. a kind of asphalt, it is characterised in that：It is made by the design method described in any one of claim 1~7.
9. application of the asphalt in road surface structare layer and/or stress absorbing layer described in claim 8.
10. application of the asphalt according to claim 9 in road surface structare layer and/or stress absorbing layer, it is special
Levy and be：Described road surface structare layer is the bottom surface layer or semi-rigid base asphalt pavement structure of old cement concrete road repaving asphalt coat
Below layer；The paving design thickness of described road surface structare layer is 3~10cm.
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| CN108560365A (en) * | 2018-03-16 | 2018-09-21 | 同济大学 | A kind of method of minute design BUTON rock asphalt mixture |
| CN110482910A (en) * | 2019-09-10 | 2019-11-22 | 广州大学 | A kind of penetration type bituminous concrete and its preparation method and application |
| CN110965422A (en) * | 2019-12-13 | 2020-04-07 | 江苏中路工程技术研究院有限公司 | Flexible splicing paving structure and construction method thereof |
| CN111153632A (en) * | 2020-01-06 | 2020-05-15 | 上海道淳交通科技有限公司 | Fine-grain type semi-open graded asphalt mixture and mix proportion design method thereof |
| CN111383720A (en) * | 2020-03-26 | 2020-07-07 | 中铁二院工程集团有限责任公司 | Asphalt mixture mixing ratio design method suitable for surface layer of high-speed railway foundation bed in severe cold region |
| CN111831961A (en) * | 2020-07-30 | 2020-10-27 | 山东大学 | Cement dose estimation method and system for skeleton compact type cement stabilized macadam |
| CN112592106A (en) * | 2020-12-31 | 2021-04-02 | 山东高速工程检测有限公司 | Design method for mix proportion of sand grain type iron tailing asphalt mixture |
| CN113213814A (en) * | 2021-05-14 | 2021-08-06 | 河南中交路通工程监理咨询有限公司 | Preparation method of large-particle-size asphalt concrete |
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| CN108560365A (en) * | 2018-03-16 | 2018-09-21 | 同济大学 | A kind of method of minute design BUTON rock asphalt mixture |
| CN108560365B (en) * | 2018-03-16 | 2021-03-26 | 同济大学 | Method for finely designing Buton rock asphalt mixture |
| CN110482910A (en) * | 2019-09-10 | 2019-11-22 | 广州大学 | A kind of penetration type bituminous concrete and its preparation method and application |
| CN110965422A (en) * | 2019-12-13 | 2020-04-07 | 江苏中路工程技术研究院有限公司 | Flexible splicing paving structure and construction method thereof |
| CN110965422B (en) * | 2019-12-13 | 2021-11-05 | 江苏中路工程技术研究院有限公司 | Flexible splicing paving structure and construction method thereof |
| CN111153632A (en) * | 2020-01-06 | 2020-05-15 | 上海道淳交通科技有限公司 | Fine-grain type semi-open graded asphalt mixture and mix proportion design method thereof |
| CN111383720A (en) * | 2020-03-26 | 2020-07-07 | 中铁二院工程集团有限责任公司 | Asphalt mixture mixing ratio design method suitable for surface layer of high-speed railway foundation bed in severe cold region |
| CN111831961A (en) * | 2020-07-30 | 2020-10-27 | 山东大学 | Cement dose estimation method and system for skeleton compact type cement stabilized macadam |
| CN111831961B (en) * | 2020-07-30 | 2021-07-27 | 山东大学 | Cement dose estimation method and system for skeleton compact type cement stabilized macadam |
| CN112592106A (en) * | 2020-12-31 | 2021-04-02 | 山东高速工程检测有限公司 | Design method for mix proportion of sand grain type iron tailing asphalt mixture |
| CN113214661A (en) * | 2021-05-10 | 2021-08-06 | 江阴泰富沥青有限公司 | Design and construction method of pouring type epoxy rubber powder composite modified asphalt mixture |
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