CN117702565A - Pavement structure layer for maintaining guide track and construction process thereof - Google Patents
Pavement structure layer for maintaining guide track and construction process thereof Download PDFInfo
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Abstract
The invention relates to a pavement structure layer for maintaining guide track ruts and a construction process thereof, belonging to the technical field of road engineering. The pavement structure layer comprises a lower surface layer, an upper surface layer, and broken stone for connecting the lower surface layer and the upper surface layer and being positioned on the lower surface layer. The guide track rut is not generated after being maintained by the pavement structure layer, so that maintenance cost is saved, travelling comfort and safety are guaranteed, road traffic is prevented from being influenced by frequent maintenance, and resource waste and environmental pollution caused by maintenance are also avoided. The guide way is divided into the rut concave belt and the non rut concave belt by the construction process, the thickness of the non rut concave belt milled on the original road surface is only 3cm, the original road surface is utilized to the maximum extent, the maintenance engineering amount is reduced, the maintenance cost is reduced, and the waste pollution caused by maintenance is reduced.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a pavement structure layer for maintaining guide tracks and a construction process thereof.
Background
At present, most of urban and arterial roads in China adopt semi-rigid base asphalt pavement structural layer combination, wherein the semi-rigid base does not generate ruts, but guide road asphalt pavement generates ruts quite seriously and universally, and the reasons are that: firstly, the shear strength of the asphalt pavement is insufficient or relatively insufficient; secondly, bonding asphalt is used between layers to induce rutting. From the appearance, the ruts have concave belts in the middle and convex belts at the two sides, and most of ruts on asphalt pavement in China belong to the ruts (called unstable ruts) and are early diseases.
The guide way asphalt pavement generally generates serious ruts, greatly reduces the travelling comfort of travelling, has potential safety hazards, causes frequent maintenance, influences road traffic, increases maintenance cost, simultaneously causes resource waste and environmental pollution, and is a problem to be solved.
In order to avoid rutting of the asphalt pavement, the invention has the common characteristics of using gravels (called as equal-thickness gravels) with the particle size equal to the pavement thickness in the asphalt pavement to form a framework of 'top-sky-ground', and ensuring that the asphalt pavement can not generate rutting. However, it is limited in that it is difficult to obtain a large amount of crushed stone having an equal thickness, and the crushed stone is not a regular-shaped object, and the particle diameters in mutually perpendicular directions are mostly unequal, and the uniform thickness of the crushed stone after spreading is in a "lying flat" state, and the particle diameter smaller than the thickness of the road surface is mostly in a "standing" state, that is, it is difficult, if not impossible, to secure a large amount of crushed stone having a particle diameter equal to the thickness of the road surface in the normal direction of the road surface.
Disclosure of Invention
In order to solve the technical problems, the invention provides a pavement structure layer for maintaining guide track ruts and a construction process thereof, and aims to prevent the guide track asphalt pavement from rutting.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a pavement structure layer for maintaining guide track comprises a lower layer, an upper layer, connecting broken stone for connecting the lower layer and the upper layer and broken stone positioned on the lower layer, wherein the broken stone of the lower layer comprises a maximum particle diameter d of the lower layer max Crushed stone and crushed stone with other particle sizes of the lower layer, wherein the maximum particle size d of the lower layer max The particle size of the crushed stone accords with the specification of (JTG F40-2004) Highway asphalt pavement construction technical specification;
the particle size of the connecting broken stone used for connecting the lower surface layer and the upper surface layer is the thickness a of the upper surface layer, the thickness b of the lower surface layer and the maximum particle size d of the lower surface layer max The particle diameter of the broken stone is between the upper surface layer thickness a and the lower surface layer thickness b, and specifically comprises the maximum particle diameter D max Connecting broken stone with other broken stone with maximum particle diameter D max The grain size of the connecting broken stone is the thickness a of the upper layer and the thickness b of the lower layer.
Studies have shown that for a two-layer bituminous pavement structure, when the compressive modulus of resilience of the lower layer is greater than that of the upper layer, the primary site for rutting is not the lower layer, but the upper layer. Therefore, the range of particle size D of the connecting crushed stone is selected to be: upper layer thickness a + lower layer thickness b-lower layer maximum particle diameter d max The broken stone particle size-the upper layer thickness a+the lower layer thickness b, wherein a part of the maximum particle size equal to the thickness of the double-layer asphalt pavement structure layer is connected with broken stone to form a strong framework of 'top-to-ground', and other connected broken stone is planted in the semi-rigid and semi-flexible lower layer which does not generate rutting and penetrates through the whole thickness of the upper layer. The design of the lower layer and the connecting gravels not only ensures that the lower layer and the connecting gravels can not generate ruts, but also ensures that the upper layer with smaller compression resilience modulus can not generate ruts, and further can limit the vertical plastic deformation of the double-layer asphalt pavement structural layer, so that ruts can not be generated in the whole. In addition, a large amount of connecting broken stones enable the upper layer and the lower layer to be firmly combined, and the bearing capacity of the double-layer asphalt pavement structure layer can be guaranteed or improved. Furthermore, this design eliminates the need for interlayer binder pitch.
Further, the connecting crushed stone for connecting the lower surface layer and the upper surface layer is pre-coated rubber asphaltThe crushed stone has the oil-stone ratio (the mass ratio of the rubber asphalt to the crushed stone) of 1.0-2.0 percent and the dosage of 20m 3 /1000m 2 ～60m 3 /1000m 2 。
Further, the maximum particle diameter D max The content of the connected broken stone is more than or equal to 30 percent.
Further, the lower layer is a semi-rigid and semi-flexible pavement and comprises the following components in parts by mass: 100 parts of aggregate, 5-10 parts of emulsified asphalt, 2-4 parts of cement, 1-2 parts of waste tire rubber powder, 0.4-0.8 part of waste tire fiber, 0.5-1.5 parts of waterborne epoxy resin, 0.1-0.5 part of waterborne epoxy resin curing agent, 4-8 parts of water and 0-0.25 part of additive.
Furthermore, the aggregate grading accords with the AC-25 grading in (JTG F40-2004) technical specification for construction of highway asphalt pavement; the emulsified asphalt is cationic slow-cracking slow-setting asphalt with solid content more than or equal to 60%; the cement is 32.5 grade or 42.5 grade Portland cement; the particle size of the waste tyre rubber powder is 30-60 meshes; the waste tyre fiber is fiber generated in the processing process of waste tyre rubber powder; the water-based epoxy resin adopts cationic water-dispersible polyurethane resin, and the solid content is more than or equal to 50%; the water-based epoxy resin curing agent adopts a water-soluble polyamide adduct, and the solid content is 48% -52%; the additive is powdery aluminate and carbonate cement accelerator.
Furthermore, the design method of the mix proportion of the lower layer mixture comprises the following steps:
(1) Determining material dosage
Aggregate mix ratio design is carried out according to the requirements of (JTG F40-2004) Highway asphalt pavement construction technical Specification; determining the material consumption according to experience, and preferentially selecting the median value of the consumption range to obtain the design mixing ratio of the lower layer mixture;
(2) Preparation of the lower layer mixture for the test
Uniformly mixing the materials according to the design mixing ratio of the mixture of the lower layer for standby;
(3) Checking the slump S of the lower layer mixture L
After the lower layer mixture was uniformly mixed, the mixture was then stirred according to the method of testing the consistency of cement concrete mixtures (slump meter method) (T0522-2005)The slump test is carried out by the method, and the slump control range is as follows: s is not less than 30mm L Less than or equal to 50mm, and S L The holding time is more than or equal to 30mm and is more than 20 minutes; slump is a comprehensive index for representing the construction workability of the lower layer mixture, comprehensively reflects the demulsification time, the mixable time, the cement initial setting time, the reaction hardening speed of the mixture, the water retention property and plasticity of the mixture, the compatibility of materials and the like of the emulsified asphalt, and researches show that the construction can be successfully completed as long as the slump meets the requirements; if the requirements are met, continuing to check; otherwise, adjusting the design mixing ratio of the mixture of the lower layer, and retesting the mixture from the head;
(4) Testing the 12h unconfined compressive strength R of the underlying mix C12
After the lower layer mixture is uniformly mixed, an unconfined compressive strength test is carried out according to the method of (T0805-1994) unconfined compressive strength test of inorganic binder stabilizing materials (but test pieces are not immersed); the 12h unconfined compressive strength control value is: r is R C12 Not less than 2MPa, if the requirements are met, continuing to check; otherwise, adjusting the design mixing ratio of the mixture of the lower layer, and retesting the mixture from the head;
(5) Testing the compression modulus of resilience E of the underlying mix C
After the lower layer mixture was uniformly mixed, a compression modulus test was carried out according to the method of (T0808-1994) method of (top surface method) for testing the compression modulus of elasticity of inorganic binder-stabilized material in a room. The compression resilience modulus control value is: e (E) C And more than or equal to 3000MPa. If the requirements are met, the design mixing proportion of the lower layer mixture can be used for construction; otherwise, the mix proportion of the lower layer design mixture is adjusted and the test is carried out again from the beginning.
Studies have shown that for a two-layer bituminous pavement structure, the lower layer is the main site for rutting in the case where the compressive modulus of resilience of the upper and lower layers is close or the compressive modulus of resilience is large and small. The cement-emulsified asphalt concrete pavement using cement and asphalt (this refers to emulsified asphalt evaporation residue) as composite binder is a semi-rigid and semi-flexible pavement, its compression resilience modulus can be easily up to above 3500MPa, and is 2-3 times of that of asphalt concrete pavement, and its anti-rutting property is very outstanding, so that it is commonly called "pavement without rutting" so that the pavement is selected as lower layer. An increase in the amount of cement results in an increase in the rigidity and strength of the pavement; an increase in the amount of emulsified asphalt will result in an increase in the flexibility of the pavement; the pavement has common anti-cracking performance, so that waste tire rubber powder and waste tire fiber are added to improve the anti-cracking performance, but the increasing of the consumption of the waste tire rubber powder and the waste tire fiber can cause the poor workability of the lower layer mixture; in addition, the strength of the pavement is slow, and maintenance time is generally required to be 5-7 days, so that the maintenance time is controlled to be less than 24 hours by adding the aqueous epoxy resin and the aqueous epoxy resin curing agent, so that the construction time is shortened, meanwhile, the aqueous epoxy resin and the aqueous epoxy resin curing agent have the effect of improving the rut resistance of the pavement, but the workability of the mixture of the lower layer is poor due to the increase of the use amount of the aqueous epoxy resin and the aqueous epoxy resin curing agent; the water has the functions of adjusting the construction workability of the mixture of the lower layer, leading to the maximum slump due to the increase of water consumption, prolonging the retention time of the slump and the demulsification time of emulsified asphalt, and further, the water also participates in the reaction; the function of the additive: firstly, the demulsification time of the emulsified asphalt is regulated in the construction stage, the demulsification time of the emulsified asphalt can be prolonged, and secondly, the hardening reaction of cement is accelerated in the maintenance stage, but the emulsified asphalt is not required and is only used when needed. The effect of various materials is known, and the design of the mixing proportion of the lower layer of mixture is comprehensively and accurately mastered, so that the construction performance and the road performance of the lower layer of mixture reach the standard.
Further, the upper layer is AC-13 type or AC-10 type rubber asphalt concrete. The components, the mix proportion design method and the quality of the used materials meet the requirements of (JTG F40-2004) technical specification for highway asphalt pavement construction.
A construction process for a pavement structure layer for guide track maintenance, comprising the steps of:
first, milling and planing the original road surface of the guide way
(1) Milling the raised portion of rut
The method comprises the steps that a track bulge part is a part higher than the top surface of a road surface (abbreviated as the top surface of an original road) before a track is generated, the part is milled, then a track recess part is displayed, on the cross section of the widest position of the track recess, each track is provided with two boundary points (abbreviated as boundary points) between the track recess and the top surface of the original road, parallel lines of the central line of the road are marked through the two boundary points, the part between the two parallel lines is called a track recess belt, and the other track recess belt of the same guide way is marked by the same method;
(2) The parts other than the two rut concave belts in the guide way are called non-rut concave belts, the non-rut concave belts are three, and the parts facing the advancing direction of the running vehicle are respectively called a left non-rut concave belt, a middle non-rut concave belt and a right non-rut concave belt; the milling thickness of the non-rut concave belt is 3cm, namely the thickness a of the upper layer is a fixed value of 3cm;
(3) The parts of the two rutting concave belts are called rutting concave grooves, and the parts of the rutting concave belts which are milled off by the original asphalt pavement are all milled off by the original asphalt pavement;
second, connecting crushed stone and mixing
Mixing the connected crushed stones according to the requirements of asphalt crushed stones in (JTG F40-2004) technical Specification for construction of Highway asphalt pavement;
third step, connecting crushed stone transportation
Transporting the connected crushed stones to the site for later use;
fourth, the mixture of the lower layer is mixed
(1) Mixing and uniformly stirring emulsified asphalt and aqueous epoxy resin for standby;
(2) Mixing the lower layer mixture by adopting a forced mixer; sequentially adding aggregate, waste tire rubber powder, waste tire fiber, cement and stirring uniformly, and then sequentially adding water, emulsified asphalt and aqueous epoxy resin mixed solution, aqueous epoxy resin curing agent and additive and stirring uniformly;
(3) The mixture of the lower layer is uniformly mixed and discharged and directly poured into a rut concave groove;
fifth step, the mixture of the lower layer is paved
Spreading the mixture poured into the lower layer of the rut concave groove to be smooth;
sixth, the mixture of the lower layer is compacted
Vibrating the paving lower layer mixture by using a flat vibrator;
seventh, leveling the mixture of the lower layer
Leveling the top surface of the compacted lower layer mixture;
eighth step, spread and connect the broken stone
Immediately spreading connecting broken stones after compacting and leveling the mixture at the lower layer, and requiring the connecting broken stones to be uniformly spread;
ninth step, connecting broken stone by vibration rolling
Starting the rolling rod to vibrate, rolling the scattered connecting broken stone, and planting the connecting broken stone in the mixture of the lower layer;
after the crushed stones are planted and connected, the height difference between the top surface of the original road and the top surface of the mixture of the lower layer is controlled within the range of 30 mm-32 mm;
tenth step, maintenance
Maintaining the substrate for at least 12h to maintain R of the underlying layer C12 ≥2MPa；
Eleventh step, the upper layer mixture is mixed
According to the requirements of (JTG F40-2004) Highway asphalt pavement construction technical Specification;
twelfth step, transporting the mixture of the upper layer
According to the requirements of (JTG F40-2004) Highway asphalt pavement construction technical Specification;
thirteenth step, the upper layer mixture is spread
The spreading width of the upper layer mixture is the width of a guide way, and is carried out according to the requirements of (JTG F40-2004) technical Specification for highway asphalt pavement construction;
fourteenth step, rolling the upper layer mixture
According to the requirements of (JTG F40-2004) Highway asphalt pavement construction technical Specification;
fifteenth step, open traffic
According to the requirements of (JTG F40-2004) Highway asphalt pavement construction technical Specification.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention is scientific and reasonable, reduces the technical difficulty
In the prior art, the asphalt pavement is designed by taking two ends into consideration, namely, the asphalt pavement is required to have good rut resistance and good crack resistance, commonly called as two ends into consideration, however, the actual situation is often only Gu Yitou, and the technical difficulty of taking two ends into consideration is quite high; the invention has the ingenious design, so that different parts of the asphalt pavement structure layer are scientifically and reasonably divided, namely, the lower layer and the connecting broken stone ensure the integral rut resistance of the asphalt pavement structure layer, simultaneously, the requirements on the rut resistance of the upper layer are reduced, only the performances of cracking resistance, sealing and the like of the asphalt pavement structure layer are ensured, the 'Gu Yitou' is realized, and the technical difficulty is reduced.
2. The invention perfects the design theory of the asphalt pavement structural layer and promotes the technical progress
In the prior art, the formed consensus is that the lower layer in the double-layer asphalt pavement structure layer combination is a main part for generating ruts, which is not accurate when the pavement is put in the four seas, and the upper and lower layers are opposite under the condition that the compression resilience modulus is close to or is big up and small, so that the rut resistance of the lower layer is more important, and the compression resilience modulus of the lower layer is improved; however, when the compressive modulus of resilience of the lower layer is greater than that of the upper layer, the main portion where rut is generated is not the lower layer but the upper layer, and in this case, rut resistance of the upper layer is also ensured. Due to errors in design theory, ruts are generated in the upper and lower layers in engineering practice.
The invention discovers the error in the prior art of the design of the asphalt pavement structural layer, perfects the design theory of the asphalt pavement structural layer, greatly improves the compressive resilience modulus of the lower layer, ensures that the upper layer with relatively smaller compressive resilience modulus can not generate rutting, and promotes the technical progress.
3. The technology of the invention can not generate ruts after maintaining the guide track ruts, saves maintenance cost, ensures the comfort and safety of driving, avoids influencing road traffic due to frequent maintenance, and simultaneously avoids resource waste and environmental pollution caused by maintenance.
4. According to the invention, through ingenious design, the guide way is divided into the rut concave belt and the non rut concave belt, the thickness of the original road surface of the non rut concave belt is only 3cm, the original road surface is utilized to the maximum extent, the maintenance engineering amount is reduced, the maintenance cost is reduced, and the waste pollution caused by maintenance is reduced.
Drawings
FIG. 1 is a schematic view of the pavement structure for guide track maintenance of the present invention;
FIG. 2 is a drawing of a guide track maintenance construction process of the present invention;
in the figure, 1-semi-rigid base layer, 2-lower layer, 3-upper layer, 4-maximum particle size D max Connecting crushed stone, connecting crushed stone with other particle sizes, and forming a layer with the maximum particle size d below 6 max Broken stone, 7-broken stone with other particle sizes of the lower surface layer.
Detailed Description
The technical solution and effects of the present invention will be further described with reference to the accompanying drawings and specific embodiments, but the scope of the present invention is not limited thereto.
Example 1
The conditions are known in this example: the width of the guide channel is 375cm, and the design thickness of the original asphalt pavement is 10cm. Serious unsteady ruts appear for maintenance.
1. Preparation work before maintenance of guide track
(1) Lower layer mixture mix ratio design
1) Aggregate mix design
The aggregate adopts AC-25 grading, namely the maximum broken stone grain diameter d max The aggregate mix design was performed according to the requirements of (JTG F40-2004) technical specifications for highway asphalt pavement construction, which are not repeated here. The design result is: 19.0-31.5 mm crushed stone, 9.5-19 mm crushed stone, 4.75-9.5 mm crushed stone, 0-4.75 mm crushed stone and mineral powder=14:20:27:35:4.
2) Mix blend ratio design
The median value of the material dosage range is adopted, but no additive is used, the mixture proportion is as follows: aggregate, emulsified asphalt, cement, waste tire rubber powder, waste tire fiber, aqueous epoxy resin curing agent and water=100:7.5:3:1.5:0.6:1:0.3:6.
3) Preparation of the lower layer mixture for the test
The preparation method of the following layer mixture for the test is as follows:
(1) according to the mixing ratio of the crushed stone of 19.0-31.5 mm to the crushed stone of 9.5-19 mm to the crushed stone of 4.75-9.5 mm to the crushed stone of 0-4.75 mm to the mineral powder=14:20:27:35:4, mixing and uniformly mixing various materials to obtain the aggregate for standby.
(2) Mixing and uniformly stirring the emulsified asphalt and the aqueous epoxy resin according to the ratio of the emulsified asphalt to the aqueous epoxy resin=7.5:1 for later use.
(3) And (5) mixing the lower layer mixture. According to the mixing ratio of aggregate to emulsified asphalt to cement to waste tire rubber powder to waste tire fiber to water-based epoxy resin curing agent to water=100:7.5:3:1.5:0.6:1:0.3:6, adopting a forced mixer to mix, sequentially adding the aggregate to waste tire rubber powder to waste tire fiber to cement, uniformly stirring, sequentially adding water to emulsified asphalt and water-based epoxy resin mixed solution to water-based epoxy resin curing agent, and uniformly stirring for standby.
4) Checking the slump S of the lower layer mixture L
After the lower layer mixture was uniformly mixed, slump test was carried out according to the method of (T0522-2005) test method for cement concrete mixture consistency (slump meter method). The test results are: s is S L =40 mm, and S L Holding time=25 minutes of not less than 30mm, satisfying S of not less than 30mm L Less than or equal to 50mm, and S L The retention time is more than 20 minutes and is more than or equal to 30 mm.
5) Testing the 12h unconfined compressive strength R of the underlying mix C12
After the lower layer mixture is uniformly mixed, an unconfined compressive strength test is performed according to the method of (T0805-1994) unconfined compressive strength test of inorganic binder stabilizing materials (but test pieces are not immersed). The test results are: r is R C12 =2.6 MPa, satisfy R C12 The requirement of more than or equal to 2 MPa.
6) Testing the compression modulus of resilience E of the underlying mix C
After the lower layer mixture was uniformly mixed, a compression modulus test was carried out according to the method of (T0808-1994) method of (top surface method) for testing the compression modulus of elasticity of inorganic binder-stabilized material in a room. The test results are: e (E) C Not less than 3850MPa, meets E C The design mixing ratio of the lower layer mixture can be used for construction under the requirement of more than or equal to 3000MPa.
(2) Design of mixing proportion of connecting broken stone
1) Determination of particle size of connected crushed stones
According to a+b-d max D is more than or equal to a+b, calculating the particle size range of the connected crushed stone, and the calculation result is as follows: d is more than or equal to 68.5mm and less than or equal to 100mm.
2) Determining the oil-to-stone ratio of connecting crushed stone
The whetstone ratio was empirically determined and was selected to be 1.5%.
(3) Upper layer mixture mix design
The upper layer adopts AC-13 rubber asphalt concrete, and the mix proportion design is carried out according to the requirements of (JTG F40-2004) technical Specification for highway asphalt pavement construction, which is not repeated.
The design results are as follows:
1) The aggregate mixing ratio is as follows: crushed stone with the diameter of 9.5mm to 16.0mm, crushed stone with the diameter of 4.75mm to 9.5mm, crushed stone with the diameter of 0mm to 4.75mm, mineral powder=26:27:43:4;
2) The oil-stone ratio is: 5.6%.
(4) The lower layer mixture and the connecting broken stone are subjected to trial paving, and the consumption of the lower layer mixture and the connecting broken stone in unit area is determined; trial laying of upper layer mixture, and determination of loose laying coefficient
In a test mold of 100cm×100cm×10cm (the height of the test mold is equal to the design thickness of the original road surface), the lower layer mixture of 5cm thickness is spread, compacted and leveled. Spreading the connecting gravels, controlling the clear distance between the connecting gravels to be 2 cm-3 cm, placing a steel plate with the length of 110cm multiplied by 110cm on the connecting gravels, and vibrating and pressing until the steel plate contacts the test die. The thickness of the upper layer is required to be made, namely the thickness of the upper layer of the test pavement, which is measured to be 31mm from the top surface of the mixture of the lower layer to the upper edge of the test mold, is within the range of 30 mm-32 mm, and meets the requirements; the usage amount of the connecting broken stone is 0.03m 3 /m 2 The method comprises the steps of carrying out a first treatment on the surface of the The amount of the mixture of the lower layer is 1m 2 ×5cm＝0.05m 3 /m 2 。
Spreading the upper layer mixture in the test mould, wherein the thickness is 33mm, and the thickness is 31mm after compaction (the compactness is more than or equal to 99%), and the loose spreading coefficient is 33 mm/31 mm approximately equal to 1.1.
2. Guide track maintenance
As shown in fig. 2, the method comprises the following steps:
first, milling and planing the original road surface of the guide way
(1) Milling the raised part of the rut. And milling the rut raised part higher than the top surface of the original road. After that, the width of the widest part of the rut concave part on the cross section is 100cm, the width of the two rut concave belts is 100cm, the parallel lines of the road center line are marked through the demarcation points, and the positions of the rut concave belts are marked on the road. Thereafter, the widths of the left, middle and right non-rut recessed bands were measured to be 37.5cm, 100cm and 37.5cm, respectively.
(2) The milling thickness of the left, middle and right non-rutting concave zones is 3cm.
(3) And the original asphalt pavement is entirely milled at the positions of the two rutting concave belts.
Second, connecting crushed stone and mixing
The mixing of the connecting crushed stone is carried out according to the requirements of asphalt crushed stone in (JTG F40-2004) technical Specification for construction of Highway asphalt pavement, wherein: the particle size of the broken stone is 68.5 mm-100 mm, and the oil-stone ratio is 1.5%.
Third step, connecting crushed stone transportation
And transporting the connected crushed stones to the site for later use.
Fourth, the mixture of the lower layer is mixed
(1) According to the mixing ratio of the crushed stone of 19.0-31.5 mm to the crushed stone of 9.5-19 mm to the crushed stone of 4.75-9.5 mm to the crushed stone of 0-4.75 mm to the mineral powder=14:20:27:35:4, mixing and uniformly mixing various materials to obtain the aggregate for standby.
(2) Mixing and uniformly stirring the emulsified asphalt and the aqueous epoxy resin according to the ratio of the emulsified asphalt to the aqueous epoxy resin=7.5:1 for later use.
(3) According to the mixing ratio of aggregate to emulsified asphalt to cement to waste tire rubber powder to waste tire fiber to water-based epoxy resin curing agent to water=100:7.5:3:1.5:0.6:1:0.3:6, adopting a forced mixer to mix, sequentially adding the aggregate to waste tire rubber powder to waste tire fiber to cement, uniformly stirring, sequentially adding water to emulsified asphalt and water-based epoxy resin mixed solution to water-based epoxy resin curing agent to additive, and uniformly stirring.
(4) And (5) uniformly mixing the lower layer of mixture, discharging, and directly pouring into a rut concave groove.
Fifth step, the mixture of the lower layer is paved
According to 0.05m 3 /m 2 The mixture poured into the lower layer of the rut concave groove is paved and leveled.
Sixth, the mixture of the lower layer is compacted
The paving lower layer mixture is vibrated by a flat vibrator.
Seventh, leveling the mixture of the lower layer
Leveling the top surface of the compacted lower layer mixture.
Eighth step, spread and connect the broken stone
After the mixture of the lower layer is compacted and leveled, the mixture is immediately leveled according to 0.03m 3 /m 2 The connecting gravels are uniformly spread, and the net distance between the connecting gravels is controlled to be 2 cm-3 cm.
Ninth step, connecting broken stone by vibration rolling
Starting vibration by using a vibration roller with the length not less than 400cm, rolling and spreading connecting broken stone, and planting the connecting broken stone in the mixture of the lower layer.
Tenth step, maintenance
And (5) preserving moisture and maintaining for at least 12 hours.
Eleventh step, the upper layer mixture is mixed
According to the requirements of (JTG F40-2004) Highway asphalt pavement construction technical Specification.
Twelfth step, transporting the mixture of the upper layer
According to the requirements of (JTG F40-2004) Highway asphalt pavement construction technical Specification.
Thirteenth step, the upper layer mixture is spread
Upper layer mixture paving thickness = loose paving coefficient x trial upper layer thickness = 1.1 x 31mm ≡34mm; the spreading width of the upper layer mixture is the width of the guide way, namely 375cm. The spreading of the upper layer mixture is carried out according to the requirements of (JTG F40-2004) technical Specification for construction of Highway asphalt pavement.
Fourteenth step, rolling the upper layer mixture
According to the requirements of (JTG F40-2004) Highway asphalt pavement construction technical Specification.
Fifteenth step, open traffic
According to the requirements of (JTG F40-2004) Highway asphalt pavement construction technical Specification.
The pavement structure layer for guide track maintenance formed according to the construction process is shown in figure 1 and is positioned above a semi-rigid base layer 1 and comprises a lower layer 2, an upper layer 3, connecting broken stone for connecting the lower layer and the upper layer and broken stone positioned on the lower layer, wherein the broken stone of the lower layer comprises the maximum particle diameter d of the lower layer max The crushed stone 6 and the crushed stone 7 with other particle diameters of the lower layer, wherein the maximum particle diameter d of the lower layer max The particle size of the broken stone 6 accords with the specification of (JTG F40-2004) Highway asphalt pavement construction technical specification; the particle size of the connecting broken stone used for connecting the lower surface layer 2 and the upper surface layer 3 is the thickness a of the upper surface layer, the thickness b of the lower surface layer and the maximum particle size d of the lower surface layer max The particle diameter of the broken stone is between the upper surface layer thickness a and the lower surface layer thickness b, and specifically comprises the maximum particle diameter D max Connecting the crushed stone 4 with the crushed stone 5 with other particle sizes, and the maximum particle size D max The grain size of the connecting crushed stone 4 is the upper surface layer thickness a+the lower surface layer thickness b.
It should be noted that the above-mentioned embodiments illustrate rather than limit the technical solution of the present invention, and that those skilled in the art may substitute equivalents or make other modifications according to the prior art without departing from the spirit and scope of the technical solution of the present invention, and are included in the scope of the claims.
Claims (7)
1. A pavement structure layer for maintaining guide track is characterized by comprising a lower surface layer, an upper surface layer, connecting broken stone for connecting the lower surface layer and the upper surface layer and broken stone positioned on the lower surface layer, wherein the broken stone of the lower surface layer comprises a maximum particle diameter d of the lower surface layer max Crushed stone and crushed stone with other particle sizes of the lower layer, wherein the maximum particle size d of the lower layer max The particle size of the crushed stone accords with the specification of JTG F40-2004 highway asphalt pavement construction technical specifications;
the particle size of the connecting broken stone used for connecting the lower surface layer and the upper surface layer is the thickness a of the upper surface layer, the thickness b of the lower surface layer and the maximum particle size d of the lower surface layer max The particle diameter of the broken stone is between the upper surface layer thickness a and the lower surface layer thickness b, and specifically comprises the maximum particle diameter D max Connecting broken stone with other broken stone with maximum particle diameter D max The grain size of the connecting broken stone is the thickness a of the upper layer and the thickness b of the lower layer.
2. The pavement structure for guide track maintenance according to claim 1, wherein said connecting macadam for connecting the lower and upper layers is a pre-coated rubber asphalt macadam having an oil to stone ratio of 1.0% to 2.0% and an amount of 20m 3 /1000m 2 ～60m 3 /1000m 2 。
3. The pavement structure for guide track maintenance according to claim 2, characterized in that said maximum particle size D max The content of the connected broken stone is more than or equal to 30 percent.
4. The pavement structure layer for guide track maintenance according to claim 1, wherein the lower layer is a semi-rigid and semi-flexible pavement, comprising the following components in parts by mass: 100 parts of aggregate, 5-10 parts of emulsified asphalt, 2-4 parts of cement, 1-2 parts of waste tire rubber powder, 0.4-0.8 part of waste tire fiber, 0.5-1.5 parts of waterborne epoxy resin, 0.1-0.5 part of waterborne epoxy resin curing agent, 4-8 parts of water and 0-0.25 part of additive.
5. The pavement structure for guide track maintenance of claim 4, wherein the aggregate is AC-25 graded; the emulsified asphalt is cationic slow-cracking slow-setting asphalt with solid content more than or equal to 60%; the cement is 32.5 grade or 42.5 grade Portland cement; the particle size of the waste tyre rubber powder is 30-60 meshes; the waste tyre fiber is fiber generated in the processing process of waste tyre rubber powder; the water-based epoxy resin adopts cationic water-dispersible polyurethane resin, and the solid content is more than or equal to 50%; the water-based epoxy resin curing agent adopts a water-soluble polyamide adduct, and the solid content is 48% -52%; the additive is powdery aluminate and carbonate cement accelerator.
6. The pavement structure for guide track maintenance of claim 1, wherein the upper layer is AC-13 or AC-10 rubber asphalt concrete.
7. A construction process for a pavement structure layer for maintenance of guide tracks, characterized by comprising the steps of:
first, milling and planing the original road surface of the guide way
(1) Milling the raised portion of rut
The method comprises the steps that a track bulge part is higher than the top surface of a road surface before a track is generated, the track bulge part is milled, then the track bulge part is displayed, two boundary points between the track bulge and the top surface of an original road exist on the cross section of the widest position of the track bulge, parallel lines of the central line of the road are marked through the two boundary points, the part between the two parallel lines is called a track bulge area, and the other track bulge area of the same guide way is marked by the same method;
(2) The parts other than the two rut concave belts in the guide way are called non-rut concave belts, the non-rut concave belts are three, and the parts facing the advancing direction of the running vehicle are respectively called a left non-rut concave belt, a middle non-rut concave belt and a right non-rut concave belt; the milling thickness of the non-rut concave belt is 3cm, namely the thickness of the upper layer is 3cm;
(3) The parts of the two rutting concave belts are called rutting concave grooves, and the parts of the rutting concave belts which are milled off by the original asphalt pavement are all milled off by the original asphalt pavement;
second, connecting crushed stone and mixing
Third step, connecting crushed stone transportation
Transporting the connected crushed stones to the site for later use;
fourth, the mixture of the lower layer is mixed
(1) Mixing and uniformly stirring emulsified asphalt and aqueous epoxy resin for standby;
(2) Mixing the lower layer mixture by adopting a forced mixer; sequentially adding aggregate, waste tire rubber powder, waste tire fiber, cement and stirring uniformly, and then sequentially adding water, emulsified asphalt and aqueous epoxy resin mixed solution, aqueous epoxy resin curing agent and additive and stirring uniformly;
(3) The mixture of the lower layer is uniformly mixed and discharged and directly poured into a rut concave groove;
fifth step, the mixture of the lower layer is paved
Spreading the mixture poured into the lower layer of the rut concave groove to be smooth;
sixth, the mixture of the lower layer is compacted
Vibrating the paving lower layer mixture by using a flat vibrator;
seventh, leveling the mixture of the lower layer
Leveling the top surface of the compacted lower layer mixture;
eighth step, spread and connect the broken stone
Immediately spreading connecting broken stones after compacting and leveling the mixture at the lower layer, and requiring the connecting broken stones to be uniformly spread;
ninth step, connecting broken stone by vibration rolling
Starting the rolling rod to vibrate, rolling the scattered connecting broken stone, and planting the connecting broken stone in the mixture of the lower layer;
after the crushed stones are planted and connected, the height difference between the top surface of the original road and the top surface of the mixture of the lower layer is controlled within the range of 30 mm-32 mm;
tenth step, maintenance
Maintaining the substrate for at least 12h to maintain R of the underlying layer C12 ≥2MPa；
Eleventh step, the upper layer mixture is mixed
Twelfth step, transporting the mixture of the upper layer
Thirteenth step, the upper layer mixture is spread
The spreading width of the upper layer mixture is the width of the guide way;
fourteenth step, rolling the upper layer mixture
Fifteenth, traffic is opened.
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