CN106522056A - Design method of rigid-flexible composite basecourse road section based on asphalt pavement - Google Patents
Design method of rigid-flexible composite basecourse road section based on asphalt pavement Download PDFInfo
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- CN106522056A CN106522056A CN201610727006.8A CN201610727006A CN106522056A CN 106522056 A CN106522056 A CN 106522056A CN 201610727006 A CN201610727006 A CN 201610727006A CN 106522056 A CN106522056 A CN 106522056A
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- filler
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Classifications
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
Abstract
The invention discloses a design method of a rigid-flexible composite basecourse of an asphalt pavement. The design method includes using large-diameter stones with single particle sizes as base materials in a design method of a semi-rigid basecourse of a conventional asphalt pavement to form a framework structure with a better inner frictional resistance, directly paving the base materials on a subbase course or an old road, using plant mixing fine aggregate cements as fillers, and using a road-mix method to mix the fillers with the base materials in a fixed proportion to form a stable pavement basecourse structure. The design method of the rigid-flexible composite basecourse based on the asphalt pavement has the advantages of greatly prolonging the service life of the road, reducing the times of overhaul and the frequency of daily maintenance, maintaining good road service performance and greatly decreasing the life cycle cost of the road.
Description
Technical field
The invention belongs to the design field of pavement construction material, and in particular to the combination of rigidity and flexibility basic unit road based on bituminous paving
The method for designing of section.
Background technology
Bituminous paving refers to the various types of road surfaces for mixing bitumen for road use material making in mineral nitrogen material.Colophonium is combined
Material improves to pave the way resists the ability of driving and the infringement of natural cause road pavement with pellet, makes evenness of road surface few dirt, waterproof, Jing
It is durable long.Therefore, bituminous paving is a kind of high class pavement being the most widely used in road construction.
Existing asphalt pavement structure is followed successively by bed course, underlayment, basic unit from top to bottom to there is uppermost surface layer.
Surface layer is directly to bear the structure sheaf that wheel load repeated action and natural cause affect, and can be constituted by 1 ~ 3 layer.Table
Surface layer should arrange that antiskid is wear-resisting, closely knit stable bitumen layer according to requirements;Middle surface layer, cutting optimal should according to road quality classification,
Asphalt thickness, weather conditions etc. select appropriate bituminous texture layer.
Basic unit is provided under surface layer, and the repeated action of wheel load is spread underlayment, pad together with surface layer
Layer, soil matrix, play the level of main load-bearing effect.The intensity index of base material should have higher requirement.Basic unit regards road quality classification
Or the needs of the volume of traffic can arrange one layer or two-layer.When the thicker need point two-layer of basic unit is constructed, basic unit, lower base can be referred to as
Layer.
Underlayment is provided under basic unit, and bears wheel load repeated action together with surface layer, basic unit, plays secondary holding
The level of recast.The intensity index of subbase course material requires lower slightly than base material.Underlayment regards road quality classification or traffic
The needs of amount can arrange one layer or two-layer.When the thicker need point two-layer of underlayment is constructed, underlayment, lower base can be referred to as
Layer.Bed course is provided in the structure sheaf between underlayment and soil matrix, plays the effect such as draining, water proof, antifreeze, antifouling.
Existing asphalt highway basic unit is divided into semi-rigid type base and flexbile base.Semi-rigid type base is inorganic junction
Material is controlled, such as：Cement stabilized macadam, China's popularity use semi-rigid type base；Flexbile base does not have inorganic binder, such as：Level
It is with rubble, external using more.
The great advantage of semi-rigid type base is that plate body is strong, with very high bearing capacity, is commonly used to the volume of traffic abroad
Not very big highway.Its major defect：1. reflection crack；2. bad hydraulic permeability；3. pair heavy duty is sensitive；4. no healing ability.
Especially reflection crack problem, has a strong impact on Road Service Life, is referred to as " cancer " of semi-rigid asphalt pavement.China
Highway generally adopts thicker asphalt surface course（General more than 18 centimetres）To delay the reflection in crack, high cost, effect are poor.It is general
Logical arterial highway asphalt surface course is relatively thin（General less than 10 centimetres）, reflection crack start within general 2 to 3 years occur, occur getting up early break
Bad, its repairing is also relatively difficult, and highway is very fast using quality decay.
The advantage of flexbile base is areflexia crack, good water permeability, insensitive to heavy duty, has the disadvantage that being also easy to produce level pushes away
Move, check crack sinks, rut, especially canalized traffic section become apparent from.It is external to adopt mostly full thickness formula bitumen layer（20 40 lis
Rice）To overcome check crack sinking etc..
How to gather the advantage of both semi-rigid type base and Flexible Base, and overcome both shortcomings, be one urgently
Problem to be solved, both at home and abroad all complete schemes of neither one solve this technical problem.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention to provide a kind of based on the firm of bituminous paving
The method for designing of soft mixing basic unit.
Technical scheme：For solving above-mentioned technical problem, the present invention provides a kind of combination of rigidity and flexibility basic unit based on bituminous paving
The method for designing in section, its method for designing are in the semi-rigid type base method for designing of conventional bituminous paving, using single grain
The particle size building stones in footpath form the framing structure with preferable inner frictional resistance, which are directly paved in underlayment as basic unit's base material
Or on old road；Filler is done with plantmix's fine aggregate cement stabilized macadam, according to set proportion, is mixed with base material by way of road mix
Conjunction forms stable Pavement Base Structure.
Further, the particle diameter of the particle size building stones of the single particle size is 40mm ~ 60mm, 60mm ~ 80mm or 20mm ~ 40mm
In one kind.
Further, described filler is conventional fine aggregate water stability detritus, and maximum particle diameter is 19mm, by back court mixer
Mix, filler adopt continuous grading, and in optimum moisture content, unconfined compressive strength is more than 6.0Mpa to water content control within 7 days.
Further, the base material with the determination step of proportion of filler is：
1）Determine the porosity of base material：
Test measures porosity of the base material in the case where situation and loose heap situation is enriched, and takes porosity under substantial situation and loose heap situation
Intermediate value VIn, it is the porosity of base material；
2）It is determined that per side compound in the steady filler of water volume
It is assumed that in the state of the steady filler of water is with test chamber optimum moisture content and maximum dry density, being filled in the space of base material, being
Ensure that the steady filler of water can be compacted between base material space well, the consumption of the steady filler of water should be able to fill up space between base material simultaneously
It is more than needed, then：
Per volume V of the steady filler of side's waterFill out= VIn+ VIt is more than needed
In view of the variability of construction, VIt is more than neededFor VIn10%；
3）Calculate the mass ratio of filler and base material
Per the quality=V of side's fillerFill out× filler hits real maximum dry density
Per side's base material quality=（1-VFill out）× base material apparent density, 1 in formula refer to every side；
Mass ratio per side's filler and base material=per side's packing quality/per side's base material quality；
4）Determine the paving thickness of base material and filler
Pave test section first, design thickness, test section paving width according to basic unit, length, calculates and paves needed for section
The quality of base material and filler, by the quantity test section in uniformly pave, the thickness finally surveyed is exactly base material and filler
Paving thickness；
5）Determine loose laying depth coefficient of the filler relative to base material paving thickness
The base material determined according to test section and the paving thickness of filler, in the case of the change less such as groundwork thickness, material, meter
Calculate filler relative to base material paving thickness loose laying depth coefficient, the coefficient can as pave filler when THICKNESS CONTROL index
Use.
As base material is thick and more, volume accounts for 50% of total amount or so, and the stable Pavement Base Structure is that filler passes through road
The mode mixed is blended in base material space, after compaction moulding, and the steady filler of water is in three kinds of states in base material：It is ultra dense, closely knit, deficient
It is close, close state to be owed typically 10% to 30%, be enough lax crack sources that provides inside base layer structure, road mix hybrid technique is again
The bonding force of base material and filler is weakened, is easy to crack source to extend.It is as base material has stronger interlocking ability, a small amount of in space
Owe close state cannot also be compacted under long-term driving effect, any impact is not produced on bearing capacity.In three kinds of states in above-mentioned
It is closely knit to refer to the standard density for having reached laboratory, by Department of Transportation's industry testing regulationss test, owe close referring to less than test
The standard density of room.
The method that the present invention is provided is broken the whole up into parts by taking inside base layer structure, produces the lax mode of microcrack,
To discharge shrinkage stress, stress is made not concentrate, strain is not superimposed, and reaches the purpose for overcoming contraction fissure and load Crack.Due to
Base material forms the framework of interlocking, is the main source of sub-surface intensity, and the steady filler of water plays firm base material framework effect.It is actual
In construction, by adjusting the quantitative proportion of base material and filler, sub-surface is made to reach the modulus of resilience and effect of prestressed of design
Aggregate balancing.
The technical problem to be solved employs the following technical solutions to realize：
Beneficial effect：For hinge structure of the present invention, with advantages below：
1）The present invention is applied to newly reconstruct highway, significantly can increase the service life, and reduces LCC.
China's bituminous paving is destroyed because of semi-rigid structure, generally uses the life-span for 10 ~ 15 years.And restorative overhaul
Difficulty is big, high cost.The inventive technique is applied between asphalt surface course and semi-rigid type base, as elastic excessive, ties road surface
Structure composition more rationally, reduces knot and constitutes autoclasia, extends the overall service life of bituminous paving.
The base layer structure compression rebound modulu in 900MPa or so, between the semi-rigid (flexbile base and flexbile base between
Typically in 300MPa or so, semi-rigid type base is in 1800MPa or so.The modulus of resilience is big, and bearing capacity is strong), it is a kind of firm
The soft new base layer structure for mutually helping.The structure can overcome conventional Semi-rigid Base Reflective Crevice and flexbile base check crack, sinking
The shortcomings of, and with enough bearing capacities, be a kind of new hard and soft mixing basic unit.
2）The present invention can reduce the laying depth of asphalt surface course, greatly reduce road construction cost.
In Pavement Structure Design, by the upper basic unit in 2 ~ 3 layers of water stability detritus of existing conventional design, design for change is firm
Soft composite base, increases by 20% or so than cement treated material cost, accounts for new reconstruction gross investment 1% or so, can increase the service life 1 times
More than.
If reconstructing for highway, can be generally thinning using thickness bitumen layer at present, 10 centimetres are reduced to by 18 centimetres,
Realize " strong basis sake ", not only save great amount of investment, also reduce the diseases such as asphalt surface course rutting deformation.
Due to increasing the service life, regular maintenance is reduced, the highway for not only keeping normality good uses quality, also reduces
LCC, economic benefit and social benefit it is notable.
The present invention is applied to Semi rigid bituminous surface and overlays overhaul, overcomes the reflection crack on original road surface, feeds them into good
Property circulation, its life-time dilatation, save LCC and new reconstruction highway is identical.
In addition, the present invention is also used as the discarded asphalt fragment of bituminous paving（Particle diameter is more than 2 centimetres）, make
Directly use for coarse aggregate, be conducive to environmental protection and energy-saving and emission-reduction, recycling economy effect is good.
3）The present invention can be used as the technological approaches for exploring China's Long Life Asphalt Pavement.
Long Life Asphalt Pavement is always external extensive concern and the problem for discussing, U.S.'s longevity bituminous paving is mainly taken
Full thickness formula, due to China's oil resource shortage, it is impossible to asphalt surface course is made as the U.S. sufficiently thick.Accomplish that road surface is long
Life-span, basic unit must assure that the long-life.
" the strong basis sake " that the husky celebrating woods academician of Ministry of Communications proposes is theoretical, is extensively adopted by highway in China pavement structure for a long time
With, but obstacle maximum in reality is reflection crack problem.As combination of rigidity and flexibility base layer structure efficiently solves semi-rigid type base
The object for appreciation persistent ailment of cracking, studies non-complete thick formula Long Life Asphalt Pavement to China and provides new technological approaches.
Specific embodiment
Below the present invention is further described.
A kind of method for designing of the hard and soft mixing basic unit based on bituminous paving, which concretely comprises the following steps：
First, base material prepares
Base material advantageously forms skeleton from 40mm ~ 60mm, the 60mm ~ 80mm or 20mm ~ 40mm particle size building stones of single particle size,
And the larger more conducively interlocking of its grain corner.Base material particle diameter, the preferred 60mm ~ 80mm of Heavy Traffic can be selected according to the different volume of traffic
Particle size building stones, the preferred 40mm ~ 60mm particle sizes building stones of medium traffic, light traffic can select 20mm ~ 40mm particle size building stones.Base material is adopted
The conventional steady paver of water directly paves to underlayment or old road face.
2nd, filler prepares
Filler is conventional fine aggregate water stability detritus, and maximum particle diameter is 19mm, by back court mixer mix.Filler is using continuous
Level is matched somebody with somebody, and in optimum moisture content, unconfined compressive strength is more than 6.0Mpa to water content control within 7 days.
3rd, base material and proportion of filler determine
Coordinate when mix uniformity to be the important step for determining hard and soft mixing basic unit crack resistance, structural strength and stability, be
The key point of quality control.As filler is excessive, aggregate is suspended in fine aggregate, in half firm feature；Filler is very few, aggregate void
It is difficult to fill with, easily produces the diseases such as check crack, sinking.
For reaching the aggregate balancing of the modulus of resilience and effect of prestressed of the design of hard and soft mixing basic unit, with base material in jolt ramming and heap
Porosity under cumuliformis state is determining the quantity of filler, it is ensured that filler can fill up the space between base material slightly more than needed.Base material
With the volume ratio of filler typically 50：50 or so, Construction control error is ± 5%.Base material can be determined by following 5 steps
With the ratio of filler：
1st, determine the porosity of base material：
Test measures porosity of the base material in the case where situation and loose heap situation is enriched.Take porosity under substantial situation and loose heap situation
In intermediate value V, it is the porosity of base material.
2nd, determine the volume per the steady filler of water in side's compound
It is assumed that in the state of the steady filler of water is with test chamber optimum moisture content and maximum dry density, being filled in the space of base material, being
Ensure that the steady filler of water can be compacted between base material space well, the consumption of the steady filler of water should be able to fill up space between base material simultaneously
Slightly have more than needed, then：
Volume V of the steady filler of water fills out=V in+V have more than needed
In view of the variability of construction, V has more than needed in generally V 10%.
3rd, calculate the mass ratio of filler and base material
Quality=the V of filler fills out × and filler hits real maximum dry density
Base material quality=（1-V is filled out）× base material apparent density
Mass ratio=packing quality/base material the quality of filler and base material
4th, determine the paving thickness of base material and filler
Pave test section first, design thickness, test section paving width according to basic unit, length, calculates and paves needed for section
The quality of base material and filler, by the quantity test section in uniformly pave, the thickness finally surveyed is exactly base material and filler
Paving thickness.
5th, determine loose laying depth coefficient of the filler relative to base material paving thickness
The base material determined according to test section and the paving thickness of filler, in the case of the change less such as groundwork thickness, material, meter
Calculate filler relative to base material paving thickness loose laying depth coefficient, the coefficient can as pave filler when THICKNESS CONTROL index
Use.
4th, scene mixing paves
Filler back court is transported to job site after mixing, and is coordinated using Miniature digging machine and manually uniform filling paves on base material, adopted
Turned uniformly with special mixing equipment, mix and stir from edge and turn to centre, should longitudinally be overlapped 15-20cm when turning, no
Must have at omission.Special messenger digs pit at scene and checks that the uniformity for turning, filler fill whether situation, filler are filled to knot in base material
Structure layer bottom, if undesirable need to continue to turn.Especially vertically and horizontally seam crossing, special messenger to be had are responsible for checking whether and are turned
It is even, it is ensured that base material meets design requirement with proportion of filler.
5th, compacting, health preserving
Each scope of operation is equipped with the vibrated roller one of more than 22J in order, and 18～21T three-roll road rollers one shake
Typically at 3-5 time, three-wheel wheel press static pressure is no less than 3 times the number of rolling of dynamic road roller；During vibroroller cmpacting, compacting counting is " peaceful
Cross and do not owe ".After rolling end, you can open to traffic, general watering health preserving 7 days.In 7 days preserving periods, in case of the rainy day should close friendship
It is logical.
The present embodiment through actual road test, the base layer structure compression rebound modulu in 900MPa or so, between semi-rigid and
Between flexbile base, (, typically in 300MPa or so, semi-rigid type base is in 1800MPa or so for flexbile base.The modulus of resilience is big,
Bearing capacity is strong), it is a kind of new base layer structure of coordination of potent and mild therapies.The structure can overcome conventional semi-rigid type base reflection to split
The shortcomings of seam and flexbile base check crack, sinking, and with enough bearing capacities, be a kind of new hard and soft mixing basic unit.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of method for designing in the combination of rigidity and flexibility basic unit section based on bituminous paving, it is characterised in that：Its method for designing be
In the semi-rigid type base method for designing of existing bituminous paving, by the use of the particle size building stones of single particle size as basic unit's base material, formed
Framing structure with preferable inner frictional resistance, which is directly paved on underlayment or old road；With plantmix's fine aggregate cement stabilizing
Building stones do filler, according to set proportion, are mixed to form stable Pavement Base Structure with base material by way of road mix.
2. a kind of method for designing in the combination of rigidity and flexibility basic unit section based on bituminous paving according to claim 1, its feature
It is：The particle diameter of the particle size building stones of the single particle size is the one kind in 40mm ~ 60mm, 60mm ~ 80mm or 20mm ~ 40mm.
3. a kind of method for designing in the combination of rigidity and flexibility basic unit section based on bituminous paving according to claim 1, its feature
It is：Described filler is conventional fine aggregate water stability detritus, and maximum particle diameter is 19mm, and by back court mixer mix, filler is adopted
With continuous grading, in target water content, unconfined compressive strength is more than 6.0Mpa to water content control within 7 days.
4. a kind of method for designing in the combination of rigidity and flexibility basic unit section based on bituminous paving according to claim 1, its feature
It is：The base material with the determination step of proportion of filler is：
1）Determine the porosity of base material：
Test measures porosity of the base material in the case where situation and loose heap situation is enriched, and takes porosity under substantial situation and loose heap situation
Intermediate value VIn, it is the porosity of base material；
2）It is determined that per side compound in the steady filler of water volume
It is assumed that in the state of the steady filler of water is with test chamber optimum moisture content and maximum dry density, being filled in the space of base material, being
Ensure that the steady filler of water can be compacted between base material space well, the consumption of the steady filler of water should be able to fill up space between base material simultaneously
It is more than needed, then：
Per volume V of the steady filler of side's waterFill out= VIn+ VIt is more than needed
In view of the variability of construction, VIt is more than neededFor VIn10%；
3）Calculate the mass ratio of filler and base material
Per the quality=V of side's fillerFill out× filler hits real maximum dry density
Per side's base material quality=（1-VFill out）× base material apparent density, 1 in formula refer to every side；
Mass ratio per side's filler and base material=per side's packing quality/per side's base material quality；
4）Determine the paving thickness of base material and filler
Pave test section first, design thickness, test section paving width according to basic unit, length, calculates and paves needed for section
The quality of base material and filler, by the quantity test section in uniformly pave, the thickness finally surveyed is exactly base material and filler
Paving thickness；
5）Determine loose laying depth coefficient of the filler relative to base material paving thickness
The base material determined according to test section and the paving thickness of filler, calculate loose laying depth of the filler relative to base material paving thickness
Coefficient, the coefficient as pave filler when THICKNESS CONTROL index use.
5. a kind of method for designing in the combination of rigidity and flexibility basic unit section based on bituminous paving according to claim 4, its feature
It is：The stable Pavement Base Structure is blended in base material space, after compaction moulding by way of road mix for filler, water
Steady filler is in three kinds of states in base material：It is ultra dense, closely knit, deficient close, close state is owed, is there is provided enough inside base layer structure
Lax crack source.
6. a kind of method for designing in the combination of rigidity and flexibility basic unit section based on bituminous paving according to claim 3, its feature
It is：The target water content is 5% to 7%.
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| CN201610727006.8A CN106522056A (en) | 2016-08-26 | 2016-08-26 | Design method of rigid-flexible composite basecourse road section based on asphalt pavement |
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| CN201610727006.8A CN106522056A (en) | 2016-08-26 | 2016-08-26 | Design method of rigid-flexible composite basecourse road section based on asphalt pavement |
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Cited By (4)
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| CN110499683A (en) * | 2018-05-18 | 2019-11-26 | 东宏建设股份有限公司 | A kind of method that pipeline groove and foundation pit solidified fly ash fill |
| CN111648182A (en) * | 2020-05-15 | 2020-09-11 | 安徽省交通规划设计研究总院股份有限公司 | Single-particle-size filling type large-particle-size water-stable gravel base |
| CN112942033A (en) * | 2021-01-27 | 2021-06-11 | 河南中交路通工程监理咨询有限公司 | Pre-splitting construction process for large-particle-size water-stable gravel base |
| CN115029975A (en) * | 2022-06-14 | 2022-09-09 | 武汉理工大学 | Filling type large-particle-size cement stabilized macadam foundation and forming process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110499683A (en) * | 2018-05-18 | 2019-11-26 | 东宏建设股份有限公司 | A kind of method that pipeline groove and foundation pit solidified fly ash fill |
| CN111648182A (en) * | 2020-05-15 | 2020-09-11 | 安徽省交通规划设计研究总院股份有限公司 | Single-particle-size filling type large-particle-size water-stable gravel base |
| CN112942033A (en) * | 2021-01-27 | 2021-06-11 | 河南中交路通工程监理咨询有限公司 | Pre-splitting construction process for large-particle-size water-stable gravel base |
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| CN115029975B (en) * | 2022-06-14 | 2023-08-15 | 武汉理工大学 | Filling type large-particle-size cement stabilized macadam base and forming process thereof |
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Application publication date: 20170322 |