CN111501466B - Method for paving full-asphalt pavement of large-particle-size stone-filling roadbed - Google Patents
Method for paving full-asphalt pavement of large-particle-size stone-filling roadbed Download PDFInfo
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- CN111501466B CN111501466B CN202010400693.9A CN202010400693A CN111501466B CN 111501466 B CN111501466 B CN 111501466B CN 202010400693 A CN202010400693 A CN 202010400693A CN 111501466 B CN111501466 B CN 111501466B
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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
- E01C7/325—Joining different layers, e.g. by adhesive layers; Intermediate layers, e.g. for the escape of water vapour, for spreading stresses
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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
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/225—Paving specially adapted for through-the-surfacing drainage, e.g. perforated, porous; Preformed paving elements comprising, or adapted to form, passageways for carrying off drainage
- E01C11/226—Coherent pavings
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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
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
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Abstract
The invention discloses a method for paving a full-asphalt pavement of a large-particle-size stone-filling roadbed, and belongs to the technical field of road pavement. The paving method is characterized in that the asphalt mixture structural layer is directly paved on a large-particle-size stone-filling roadbed, the large-particle-size stone-filling roadbed is paved into a roadbed main body part and a transition layer in a layered mode, the roadbed main body part is filled with large-particle-size broken stones with particle sizes not larger than 30cm, and the transition layer is filled with broken stones with particle sizes not larger than 37.5 mm. Compared with the prior art, the pavement paving method has the characteristics of uniform bearing capacity of the stone-filled roadbed, strong road surface deformation coordination capability, good drainage property and the like, and can greatly prolong the service life of the road surface.
Description
Technical Field
The invention relates to the field of road engineering, in particular to a method for paving a large-particle-size stone-filling roadbed full-asphalt pavement.
Background
The prior art highway asphalt pavement structure mainly comprises a roadbed, a semi-rigid base layer, a lower surface layer, a middle surface layer and an upper surface layer, and part of special road sections adopt stone-filled roadbeds. On one hand, the load bearing capacity of the soil roadbed is poor, the settlement is large, and the deformation of the rockfill roadbed at a special road section is highlighted to be uneven; on the other hand, the semi-rigid base layer has poor deformation coordination capability and is easy to crack, so that the pavement structure is soaked, the traditional asphalt pavement structure mainly has water resistance, once water enters the structure, the water is difficult to discharge, the structural water is extremely easy to damage, and huge resource waste, capital and environmental protection pressure are caused by periodical overhaul and reconstruction.
Disclosure of Invention
The technical task of the invention is to provide a method for paving a large-particle-size stone-filling roadbed full-asphalt pavement, aiming at the defects of the prior art. The method starts from increasing the deformation coordination capacity of the roadbed and the waterproof and drainage combination capacity of the pavement structure, improves various performances of the pavement, slows down the pavement damage speed and prolongs the service life of the pavement.
The technical task of the invention is realized by the following modes: a method for paving a full-asphalt pavement on a large-particle-size stone-filling roadbed is characterized in that an asphalt mixture structural layer is directly paved on the large-particle-size stone-filling roadbed, the large-particle-size stone-filling roadbed is paved into a roadbed main body part and a transition layer in a layered mode, the roadbed main body part is filled with large-particle-size broken stones with particle sizes not larger than 30cm, and the transition layer is filled with broken stones with particle sizes not larger than 37.5 mm. The thickness of the transition layer is preferably 30cm to 50 cm.
Preferably, the grain diameter of the roadbed main body part is 10cm-30cm, the 20cm sieve pore passing rate is 20% -35%, and the void ratio is 8% -14%.
In order to further improve the deformation coordination capability of the stone-filled roadbed, the transition layer is preferably composed of a lower transition layer and an upper transition layer. The thickness of the lower transition layer is 20-30cm, preferably 25-30cm, and the lower transition layer is filled with gravels with the particle size not more than 37.5mm, the passing rate of a standard sieve pore of 37.5mm is 100%, the passing rate of a standard sieve pore of 9.5mm is 30-45%, and the void ratio is preferably 6-10%; the thickness of the upper transition layer is 10-20cm, preferably 15-20cm, the upper transition layer is filled with gravels with the grain diameter not more than 26.5mm, the 26.5mm sieve mesh passing rate is 100%, the 4.75mm sieve mesh passing rate is 30-50%, the 0.075mm standard sieve mesh passing rate is 0-9%, and the void ratio is preferably 6-8%.
The transition layer is filled by adopting broken stones with two specifications in a layered mode, is embedded and extruded in a loose state and has the advantages of small rigidity, large flexibility, good stress reduction between structural layers and the like, so that the deformation coordination capability of the stone filled roadbed can be improved.
Preferably, the modulus of resilience of the top surface of the roadbed is 60MPa-70MPa, and the bending tensile strain of the bottom of the asphalt layer is less than 120 mu epsilon.
The asphalt mixture structural layer can be any one of asphalt pavement structural layers in the prior art, such as the combination of: the anti-fatigue layer, the waterproof stress release layer, the lower bearing layer, the upper bearing layer and the surface abrasion layer; combining two: the asphalt mixture structure layer preferably comprises a transparent layer, a sealing layer, a composite functional layer, an anti-cracking drainage layer, a waterproof anti-rutting layer and a noise-reducing abrasion layer from bottom to top.
The penetration layer is made of emulsified asphalt, and the spreading amount is preferably 1.5-2.0kg/m2And the penetration depth is not less than 1 cm.
The seal coat adopts a modified asphalt macadam seal coat.
The composite functional layer is used for a transition layer of a roadbed and an asphalt structure layer, has the comprehensive effects of connecting the roadbed and an asphalt surface layer, adjusting the flatness of the top surface of the roadbed and preventing the moisture of the asphalt surface layer from permeating into the roadbed, the thickness is preferably 1cm-2.5cm, a discontinuous grading sand grain type asphalt mixture is adopted, the using amount of asphalt is preferably 6.0% -7.5%, the nominal maximum grain size is 4.75mm, the passing rate range of a standard sieve pore 2.36mm is 28% -65%, the passing rate range of a standard sieve pore 1.18mm is 22% -36%, the passing rate range of a standard sieve pore 0.075mm is 12% -15%, and the void ratio is preferably 2% -3%.
The anti-crack drainage layer is used as a structure layer for reducing stress between a roadbed and a surface layer, plays a role in preventing the roadbed from cracking and reflecting to the surface layer or the surface layer from cracking and extending to the roadbed, simultaneously can discharge surface layer moisture out of a pavement structure by using the characteristics of large gaps and large water permeability coefficient, the thickness is preferably 8cm-15cm, a high-viscosity asphalt large-particle-size gravel mixture is adopted, the nominal maximum particle size is 31.5mm, the 19mm passing rate range of a standard sieve pore is 40% -60%, the 4.75mm passing rate range of the standard sieve pore is 10% -25%, and the water permeability coefficient is as follows: 0.3-1.5cm/s, a maximum deformation of 10mm in the hamburger test (20000 times, 50 ℃), and a porosity of preferably 15-20%.
The waterproof anti-rutting layer mainly plays a role in resisting rutting deformation of an asphalt pavement and preventing water on the surface of the pavement from permeating the pavement structure due to excellent high-temperature performance and compactness of the waterproof anti-rutting layer, the thickness of the waterproof anti-rutting layer is preferably 4-6cm, an asphalt mastic and macadam mixture is adopted, modified asphalt is adopted, the PG is graded as PG76-22, the void ratio range of the asphalt mixture is 4.0-5.0%, the void ratio of mineral aggregate is not less than 17%, and the water permeability coefficient is 0 ml/min.
The noise-reducing wearing layer can effectively reduce tire noise in the driving process due to the larger communicating pores, the structural layer preferably adopts hard rock, the effect of resisting driving abrasion on the surface of the asphalt pavement is improved, the thickness is preferably 3-5cm, a high-viscoelasticity modified asphalt OGFC mixture is adopted, the range of asphalt using amount is 4.0% -5.0%, the passing rate of a standard sieve pore of 4.75mm is 10% -26%, the passing rate of a standard sieve pore of 2.36mm is 8% -18%, and the range of void ratio is preferably 16% -24%.
The asphalt used for the anti-cracking drainage layer and the noise-reducing wearing layer is high-viscosity high-elasticity modified asphalt, and the quality technical requirements are as follows:
kinematic viscosity (60 ℃): bean mash of 100000Pa ≤;
viscocity (30 ℃): 20 N.m or more;
toughness (30 ℃): 5, greater than or equal to 15N @;
elastic recovery (25 ℃): greater than or equal to 90%;
and (4) PG grading: PG 82-22.
Compared with the prior art, the paving method of the full-asphalt pavement of the large-particle-size stone-filling roadbed has the following outstanding beneficial effects:
the first step, two transition layers which are filled respectively are additionally arranged on the top surface of the stone-filled roadbed, the roadbed main body part and the transition layers are filled by adopting broken stones with different specifications in a layered mode, and the transition layers are distributed in a loose embedding and squeezing mode, so that the stone-filled roadbed has the advantages of small rigidity, large flexibility, uniform bearing capacity, good stress reduction between structural layers and the like, and can improve the deformation coordination capacity of the stone-filled roadbed;
secondly, the asphalt functional layer is directly paved on the large-particle-size stone-filled roadbed, so that the problems of poor deformation coordination capability and easiness in cracking of the traditional semi-rigid pavement are solved;
the asphalt pavement structure layer has excellent waterproof and drainage capacity, and the waterproof and drainage are combined with each other, so that structural water damage is avoided, and the driving safety is improved;
fourthly, a noise reduction wearing layer is laid, so that the driving noise is reduced;
and (V) the good deformation coordination capability is combined with the good waterproof and drainage performance of the asphalt pavement structure layer, so that various performances of the pavement can be improved, the pavement damage speed is slowed down, the service life of the pavement is prolonged, and the economic benefit of the pavement structure is improved.
Drawings
FIG. 1 is a schematic structural diagram of a large-particle-size stone-filling roadbed full-asphalt pavement of the invention.
Detailed Description
The method for paving a full-asphalt pavement with a large-particle-size stone-filling roadbed according to the invention is described in detail in the following by referring to the attached drawings in the specification and specific examples.
Example (b):
as shown in fig. 1, the large-particle-size stone-filling roadbed full-asphalt pavement structure of the embodiment is composed of a roadbed main body part 1, a lower transition layer 2, an upper transition layer 3, a permeable layer, a seal layer 4, a composite functional layer 5, an anti-cracking drainage layer 6, a waterproof anti-rutting layer 7 and a noise-reducing wear layer 8.
The roadbed main body part 1, the lower transition layer 2 and the upper transition layer 3 are paved from bottom to top to form the large-particle-size stone filling roadbed. The permeable layer, the sealing layer 4, the composite functional layer 5, the anti-crack drainage layer 6, the waterproof anti-rutting layer 7 and the noise-reducing abrasion layer 8 are paved from bottom to top to form an asphalt mixture structural layer.
(1) Roadbed main body part 1
The thickness is 3m, the gravel with large particle size of 10cm-30cm is adopted for filling, the passing rate of a 20cm sieve pore is 25.5%, the void ratio is 11.9%, the gravel is compacted by impact rolling, and the compactness is 96.8% (controlled by a sedimentation method).
(2) Lower transition layer 2
The thickness is 30cm, and the crushed stones are paved by 0-37.5mm graded macadam (the standard sieve aperture passing rate of 37.5mm is 100%, the standard sieve aperture passing rate of 9.5mm is 42.9%, and the void ratio is 8.5%). The single steel wheel road roller is vibrated and rolled compactly, and the compactness is not lower than 96%.
(3) Upper transition layer 3
The thickness is 20cm, the pavement is paved by 0-26.5mm graded broken stones (the passing rate of a 26.5mm sieve pore is 100%, the passing rate of a 4.75mm sieve pore is 48.2%, the passing rate of a 0.075mm standard sieve pore is 7.4%, and the void ratio is 6.7%), and the single-steel-wheel roller is vibrated and rolled to be compact, and the compactness is not lower than 98%.
(4) Permeable layer
After the upper transition layer 3 is paved, the permeable layer emulsified asphalt is immediately spread, and the spreading amount is 1.8kg/m2And taking the standard that the penetration depth of the emulsified asphalt is not less than 1cm and the runoff is not formed on the surface.
(5) Modified asphalt macadam seal coat 4
And (4) spreading by using a synchronous chip sealer, and rolling for 2 times by using a rubber-tyred roller after spreading is finished. The macadam adopts macadam with 3-5mm specification which is dedusted and premixed by an asphalt mixing station, and the spreading amount of seal coat asphalt is 1.3kg/m2The spreading amount of the crushed stones is 5.5kg/m2。
(6) Composite functional layer 5
The discontinuous grading sand type asphalt mixture is adopted, the thickness is 2cm, the nominal maximum grain size is 4.75mm, the passing rate of a standard sieve pore of 2.36mm is 34.5%, the passing rate of a standard sieve pore of 1.18mm is 29.6%, the passing rate of a standard sieve pore of 0.075mm is 14.0%, the asphalt dosage is 6.5%, and the void ratio is 2.4%.
(7) Anti-crack drainage layer 6
Adopt high-viscosity asphalt large-particle size rubble mixture, thickness 10cm, nominal maximum particle size 31.5mm, standard sieve mesh 26.5mm percent of pass 96.5%, standard sieve mesh 19mm percent of pass 58.9%, standard sieve mesh 13.2mm percent of pass 41.7%, standard sieve mesh 9.5mm percent of pass 29.9%, standard sieve mesh 4.75mm percent of pass is 20.6%, standard sieve mesh 2.36mm percent of pass 12.4%, standard sieve mesh 0.075mm percent of pass 2.3%, coefficient of permeability: 1.0cm/s, porosity 16.9%, maximum deformation in the hamburger test (20000 times, 50 ℃): 6.7 mm.
(8) Waterproof anti-rutting layer 7
The asphalt mastic macadam mixture SMA-20 is adopted, the thickness is 6cm, the asphalt adopts SBS modified asphalt, the asphalt PG is graded PG76-22, the void ratio of the asphalt mixture is 4.3%, the mineral aggregate void ratio is not less than 17.5%, and the water permeability coefficient is 0 ml/min.
(9) Noise-reducing wearing layer 8
The high-viscoelasticity asphalt OGFC-13 mixture is adopted, the thickness is 4cm, the nominal maximum particle size is 13.2mm, the passing rate of a standard sieve pore of 13.2mm is 100%, the passing rate of a standard sieve pore of 9.5mm is 70.2%, the passing rate of a standard sieve pore of 4.75mm is 15.7%, the passing rate of a standard sieve pore of 2.36mm is 12.4%, the passing rate of a standard sieve pore of 1.18mm is 11.7%, the passing rate of a standard sieve pore of 0.6mm is 8.5%, the passing rate of a standard sieve pore of 0.3mm is 7.2%, the passing rate of a standard sieve pore of 0.15mm is 5.0%, the passing rate of a standard sieve pore of 0.075mm is 4.9%, and the void ratio is 19.6%.
The asphalt used for the anti-cracking drainage layer 6 and the noise reduction wearing layer 8 is high-viscosity high-elasticity modified asphalt, and the technical indexes are as follows: kinematic viscosity (60 ℃): 140000Pa ≤ and viscosity (30 deg.C): 5N ≥ m, toughness (30 ℃ C.): 20N. et al, elastic recovery (25 ℃ C.): 95%, PG classification: PG 82-22.
The modulus of resilience of the top surface (roadbed top surface) of the upper transition layer 3 is 63.1MPa, and the bending tensile strain of the bottom of the asphalt layer is 105.7 mu epsilon.
Claims (6)
1. A method for paving a full-asphalt pavement of a large-particle-size stone-filling roadbed is characterized in that an asphalt mixture structural layer is directly paved on the large-particle-size stone-filling roadbed,
the large-particle-size stone-filled roadbed is paved into a roadbed main body part and a transition layer in a layered mode, the roadbed main body part is filled with large-particle-size broken stones with particle sizes not larger than 30cm,
the transition layer consists of a lower transition layer and an upper transition layer,
the lower transition layer is filled with gravels with the particle size not more than 37.5mm, the standard sieve pore passage rate of 9.5mm is 30-45%, and the void ratio is 6-10%;
the upper transition layer is filled with crushed stones with the particle size not larger than 26.5mm, the passing rate of a 4.75mm standard sieve pore is 30-50%, the passing rate of a 0.075mm standard sieve pore is 0-9%, and the void ratio is 6-8%;
the asphalt mixture structure layer comprises a permeable layer, a sealing layer, a composite functional layer, an anti-cracking drainage layer, a waterproof anti-rutting layer and a noise-reducing wearing layer from bottom to top,
the composite functional layer is used for a transition layer of a roadbed and an asphalt structure layer, has the comprehensive effects of connecting the roadbed and an asphalt surface layer, adjusting the flatness of the top surface of the roadbed and preventing the moisture of the asphalt surface layer from permeating into the roadbed, the thickness is 1cm-2.5cm, a discontinuous grading sand grain type asphalt mixture is adopted, the using amount of asphalt is 6.0% -7.5%, the nominal maximum grain size is 4.75mm, the passing rate range of a standard sieve pore 2.36mm is 28% -65%, the passing rate range of a standard sieve pore 1.18mm is 22% -36%, the passing rate range of a standard sieve pore 0.075mm is 12% -15%, and the void ratio is 2% -3%;
the anti-cracking drainage layer is a structural layer for reducing stress between the roadbed and the surface layer, plays a role in preventing the roadbed from cracking and reflecting to the surface layer or the surface layer from cracking and extending to the roadbed, has the thickness of 8cm-15cm, adopts a high-viscosity asphalt large-particle-size crushed stone mixture, has the nominal maximum particle size of 31.5mm, has the passing rate range of 19mm of a standard sieve pore of 40% -60%, and has the passing rate range of 4.75mm of the standard sieve pore of 10% -25%; water permeability coefficient: 0.3-1.5 cm/s; 20000 hamburger tests at 50 ℃ with maximum deformation of 10 mm; the porosity is 15% -20%.
2. The method for paving the full-asphalt pavement of the large-particle-size stone-filling roadbed according to claim 1, wherein the 20cm sieve hole passing rate of the roadbed main body part is 20% -35%, and the void ratio is 8% -14%.
3. The method for paving the large-particle-size stone-filling roadbed full-asphalt pavement according to claim 2, wherein the method comprises the following steps: the thickness of the transition layer is 30cm-50 cm.
4. The method for paving the large-particle-size stone-filling roadbed full-asphalt pavement according to claim 3, wherein the method comprises the following steps:
the thickness of the lower transition layer is 20-30 cm;
the thickness of the upper transition layer is 10-20 cm.
5. The method for paving the full-asphalt pavement of the large-particle-size stone-filling roadbed according to claim 1, 2, 3 or 4, wherein the resilience modulus of the roadbed top surface is 60MPa-70MPa, and the bending tensile strain of the asphalt layer bottom is less than 120 mu epsilon.
6. The method for paving the large-particle-size stone-filling roadbed full-asphalt pavement according to claim 1, wherein the noise-reducing wearing layer is made of a high-viscoelasticity modified asphalt OGFC mixture, the PG classification of the asphalt meets PG82-22, the dosage range of the asphalt is 4.0% -5.0%, the standard sieve aperture passing rate of 4.75mm is 10% -26%, the standard sieve aperture passing rate of 2.36mm is 8% -18%, and the void ratio is 16% -24%.
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| CN113668317A (en) * | 2021-08-31 | 2021-11-19 | 吴彬 | Asphalt highway construction method |
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