CN211256538U - Ultrathin high-performance composite semi-flexible surface layer pavement structure - Google Patents

Ultrathin high-performance composite semi-flexible surface layer pavement structure Download PDF

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Publication number
CN211256538U
CN211256538U CN201921940885.8U CN201921940885U CN211256538U CN 211256538 U CN211256538 U CN 211256538U CN 201921940885 U CN201921940885 U CN 201921940885U CN 211256538 U CN211256538 U CN 211256538U
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layer
course
pavement
flexible
semi
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章力
过震文
何家张
刘小方
何昌轩
白彦峰
庄恺琳
徐斌
张绪国
孙文州
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Shanghai Qingpu Road Management Office
Shanghai Municipal Planning And Design Institute Co ltd
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Shanghai Qingpu Road Management Office
Shanghai Municipal Planning And Design Institute Co ltd
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Abstract

The utility model relates to an ultra-thin high performance's compound semi-flexible surface course road surface structure, this road surface structure are located on the road bed, road surface structure includes by lower supreme basic unit, lower surface course, well surface course and the upper surface course that sets gradually, wherein well surface course is semi-flexible surface course, the upper surface course is for small-size footpath division gradation drainage bituminous mixture surface course, the surface course is coarse grain formula bituminous mixture surface course down. The utility model provides a semi-flexible pavement layer is located this high atress region, promotes the anti rut and the anti shear capacity on road surface. The upper surface layer adopts a small-particle-size open-graded drainage asphalt mixture pavement layer, has durability and anti-skid performance, and can provide driving comfort. The lower surface layer adopts a coarse-grained asphalt mixture pavement layer, so that the overall anti-rutting and low-temperature resistance of the pavement can be improved. In addition, the upper surface layer, the middle surface layer and the lower surface layer are made of different materials respectively, the pavement structure made of non-homogeneous materials is not easy to diffuse cracks, and the service life of the pavement structure is prolonged.

Description

Ultrathin high-performance composite semi-flexible surface layer pavement structure
Technical Field
The utility model relates to a road construction engineering field refers in particular to a high performance's compound semi-flexible surface course road surface structure.
Background
The existing road pavement in China can be basically divided into a cement concrete pavement and an asphalt concrete pavement, wherein the cement concrete pavement has good bearing capacity but poor flexibility, and the problem of plate cracking easily occurs under the action of temperature stress, so that the cement concrete pavement needs to be provided with joints, the driving comfort is influenced, and the joints can also cause surface water to invade a roadbed, so that the roadbed becomes soft and the bearing capacity is weakened. The asphalt concrete pavement has good flexibility and no joint, but after passing through one or more high-temperature seasons, the asphalt concrete pavement can generate deeper ruts, and the driving safety and the comfort are seriously influenced.
In order to overcome the defects of the two pavements, a semi-flexible pavement with good deformation resistance is researched and generated, and the semi-flexible pavement is a composite pavement formed by pouring cement mortar with good fluidity and high strength into a matrix asphalt mixture with large porosity. The semi-flexible surface layer is arranged on the surface layer of the existing road pavement, and the semi-flexible surface layer is used as a driving surface, so that the driving speed and the comfort level are improved. However, in the long-term use, the semi-flexible surface layer as a surface layer has no significant permanent deformation, but is easy to generate fatigue cracking phenomenon, and the cracking starts to form thin and short transverse cracks, and then gradually expands into a net shape, so that the width and the range of the cracks are continuously expanded, and finally the pavement is damaged.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a compound semi-flexible surface course road surface structure of ultra-thin high performance, solve present semi-flexible surface course and appear fatigue fracture phenomenon easily as the road surface top layer and lead to the problem that the road surface destroys.
The technical scheme for realizing the purpose is as follows:
the utility model provides an ultra-thin high performance's compound semi-flexible surface course road surface structure locates on the road bed, road surface structure includes by lower supreme basic unit, lower surface course, well surface course and the upper surface course that sets gradually, wherein well surface course is semi-flexible surface course, the upper surface course is for small-particle footpath open-graded drainage bituminous mixture surface course, the surface course is coarse grain formula bituminous mixture surface course down.
The utility model discloses a semi-flexible pavement layer is adopted to the well surface course of road surface structure, and the effect of vertical stress and horizontal shear force that the surface course bore road surface upper portion and transmit is in order to play promotion road surface intensity and anti rut in the utilization, and from the atress condition on road surface, the road surface mainly bears vertical stress and shear stress, and durable and cling compound ability need be considered to its upper surface, and 10cm to 15 cm's region is high atress region under the wheel load, so, the utility model provides a semi-flexible pavement layer of road surface structure is located this high atress region, promotes the anti rut and the anti shear capacity on road surface. The upper surface layer adopts a small-particle-size open-graded drainage asphalt mixture pavement layer, has higher anti-scattering loss capability and good anti-skid performance and driving comfort. The lower surface layer adopts a coarse-grained asphalt mixture pavement layer, so that the overall anti-rutting and low-temperature resistance of the pavement can be improved. Additionally the utility model discloses an upper surface layer, well surface course and lower surface course have adopted different materials respectively in the road surface structure, and the road surface structure of non-homogeneous material is difficult for the diffusion crack, improves the life of road surface structure. And when the road surface is damaged and needs to be maintained, the milling machine can also mill and plane in layers, so that resources and working hours are saved.
The utility model discloses the further improvement of ultra-thin high performance's compound semi-flexible surface course road surface layer structure lies in, semi-flexible surface course include the macroporosity bituminous mixture base member with pour into in the cement base mucilage in the space of macroporosity bituminous mixture base member, the porosity of macroporosity bituminous mixture base member is between 20% to 30%.
The utility model discloses the further improvement of ultra-thin high performance's compound semi-flexible surface course road surface structure lies in, cement base mortar has partial infiltration to in the space of lower surface course, in order to strengthen the well surface course with bond strength between the lower surface course.
The utility model discloses the further improvement of ultra-thin high performance's compound semi-flexible surface course road surface structure lies in, still including locating on the road bed with bed course under the basic unit.
The utility model discloses the further improvement of ultra-thin high performance's compound semi-flexible surface course road surface structure lies in, the bed course is the metalling, and thickness is between 10cm to 30 cm.
The utility model discloses the further improvement of ultra-thin high performance's compound semi-flexible surface course road surface structure lies in, the basic unit is cement stabilized macadam pavement layer, and thickness is between 30cm to 80 cm.
The utility model discloses the further improvement of ultra-thin high performance's compound semi-flexible surface course road surface structure lies in, the thickness of surface course is between 6cm to 10cm down.
The utility model discloses the further improvement of ultra-thin high performance's compound semi-flexible surface course road surface structure lies in, the thickness of well surface course is between 3cm to 6 cm.
The utility model discloses the further improvement of ultra-thin high performance's compound semi-flexible surface course road surface structure lies in, the thickness of upper surface course is between 1cm to 2.5 cm.
Drawings
Fig. 1 is the utility model discloses ultra-thin high performance's compound semi-flexible surface course road surface structure's cross-sectional view.
Fig. 2 is a cross-sectional view of another embodiment of the ultra-thin high performance composite semi-flexible surface pavement structure of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
Referring to fig. 1, the utility model provides an ultra-thin high performance's compound semi-flexible surface course road surface structure for solve semi-flexible road surface and directly appear the problem of fatigue fracture phenomenon as the top layer easily. The utility model discloses an upper surface adopts the small-particle diameter to open the level and joins in marriage drainage bituminous mixture and lays and form in the road surface structure, this small-particle diameter is opened the level and is joined in marriage drainage bituminous mixture and has higher anti loss ability that flies, and there are good skid resistance and driving comfort, well surface course adopts semi-flexible material to lay and forms, specifically join in marriage the large pore bituminous mixture as the skeleton in order to open the level, injected water cement base mortar forms closely knit stable structure, bear the vertical stress and the horizontal shear force that follow the upload comes, this semi-flexible pavement layer can improve the ability that the load effect was resisted in the road surface, high temperature stability can still have, low temperature crack resistance can, fatigue resistance can and skid resistance etc., arrange the upper strata below in with the semi-flexible pavement layer, utilize the upper strata can protect this semi-flexible pavement layer, avoid its phenomenon that fatigue fracture and wearing and tearing appear. The lower surface layer adopts coarse-grained asphalt mixture to improve the overall anti-rutting and low-temperature resistance. The following explains the ultra-thin high-performance composite semi-flexible surface pavement structure of the present invention with reference to the accompanying drawings.
Referring to fig. 1, a cross-sectional view of the ultra-thin high performance composite semi-flexible surface pavement structure of the present invention is shown. The ultra-thin high-performance composite semi-flexible surface pavement structure of the present invention will be described with reference to fig. 1.
As shown in fig. 1, the ultra-thin high-performance composite semi-flexible pavement structure of the present invention is disposed on a roadbed 10, and comprises a base layer 22, a lower surface layer 23, an intermediate surface layer 24 and an upper surface layer 25, which are sequentially disposed from bottom to top, wherein the intermediate surface layer 24 is a semi-flexible pavement layer and is formed by laying a semi-flexible material; the upper surface layer 25 is a small-particle-size open-graded drainage asphalt mixture pavement layer and is formed by paving small-particle-size open-graded drainage asphalt mixtures; the lower surface layer 23 is a coarse-grained asphalt mixture pavement layer and is formed by paving coarse-grained asphalt mixtures.
From the stress condition of the pavement structure in the use process, each structural layer of the pavement mainly bears vertical stress and shear stress, and the area of 10cm to 15cm under wheel load is a high-stress area, so that the middle surface layer 24 is designed into a semi-flexible pavement layer, the lower surface layer 25 is designed into a coarse-grained asphalt mixture pavement layer, the middle surface layer 24 and the lower surface layer 25 are utilized to provide rutting resistance and shearing resistance, and the strength, the rigidity, the dynamic stability, the water stability and the like of the pavement structure are improved.
The utility model discloses an upper surface course 25, well surface course 24 and lower surface course 23 have adopted the material of three kinds of different materials to form for difficult diffusion crack between the structural layer of different materials, and well surface course 24 is located under upper surface course 25, and this upper surface course 25 can play fine guard action to surface course 24, and this upper surface course 25 has durable and cling compound performance, can improve road surface structure's life. In addition, the structure of each surface layer made of different materials is convenient to maintain, and the milling can be carried out in a layering mode, so that resources and working hours are saved.
In one embodiment, the semi-flexible pavement layer comprises a macroporous asphalt matrix and a cement-based cement paste poured into the voids of the macroporous asphalt matrix, wherein the porosity of the macroporous asphalt matrix is between 20% and 30%.
Wherein, the weight percentage of the macroporous asphalt mixture matrix and the cement-based adhesive cement is 70 to 80 percent of the macroporous asphalt mixture matrix and 20 to 30 percent of the cement-based adhesive cement. The macroporous asphalt mixture matrix adopts open-graded asphalt mixture.
Specifically, the macroporous asphalt mixture adopts common road petroleum asphalt or modified asphalt as a binder, and the matrix is formed by mixing and stirring coarse aggregates, fine aggregates, active mineral powder and asphalt at a high temperature. The coarse aggregate is made of rolled macadam, and slaked lime or cement can be added to improve the adhesion between the coarse aggregate and the asphalt. The fine aggregate is made of machine-made sand or stone chips produced from alkaline rocks such as limestone.
The cement-based mortar is prepared on site, the raw materials comprise cement, fly ash, mineral powder and an additive, and sand, a polymer modifier and a coloring agent can be added, wherein the cement is portland cement or ordinary portland cement, and the fly ash is class I and class II fly ash; the mineral powder is limestone mineral powder; the additive comprises a water reducing agent, an early strength agent and an expanding agent; the added sand is clean river sand; the polymer modifier is selected from carboxylic styrene-butadiene emulsion. The cement-based mucilage has the water-to-glue ratio of 0.28-0.55, the usage amount of the fly ash is preferably 10-22%, the usage amount of the mineral powder is preferably 10-22%, and the total usage amount of the fly ash and the mineral powder is not more than 30%. When sand is added, the using amount of the sand is 10 to 29 percent; when the polymer modifier is added, the polymer-ash ratio is 10 percent; when the colorant is added, the amount of the colorant is 3-5% of the mass of the gelled material. The cement-based mortar has high strength and high fluidity and can flow into the gaps of the macroporous asphalt mixture matrix and fill the gaps.
After the cement-based mucilage is hardened, a hardened reticular structure is formed to wrap the asphalt membrane and the aggregates in the asphalt membrane, multivalent cations on the surface of cement crystals are adsorbed on the surface of mineral aggregate without compensating anions, or the cations on the surface layer exchange a plurality of anions, so that the hydrophilicity of the mineral aggregate is reduced, the surface of the aggregate is activated, the adhesion of the aggregate and the asphalt is enhanced, and the adhesion of cement stones and the mineral aggregate is improved.
When the polymer modifier is added for improvement, the coreless particles are gathered on the surfaces of cement gelled particles in the formation process of cement-based mortar, the polymer particles are flocculated on the surfaces of hydrated gels to form sealing layers, the sealing layers have cohesiveness and can be filled in larger gaps in a mixture, and active groups in partial polymer molecules can also be hydrated with cement to produceCa in the product2+、Al3+The crosslinking reaction is carried out to form a special bridge bond to reinforce the internal structure of the material; the water between the polymer particles is absorbed by hydration reaction to form dry and compact colloid which is connected with the defects and microcracks in the cement paste and improves the mechanical property of the mixture.
The semi-flexible pavement layer forms strength through embedding and extruding action among asphalt mixture aggregates and poured cement paste, so that the load resisting capacity of the pavement is improved, the high-temperature stability performance of the semi-flexible pavement layer is greatly superior to that of a common asphalt concrete pavement, the low-temperature crack resistance, the fatigue resistance and the skid resistance of the semi-flexible pavement layer are also superior to those of the common asphalt concrete pavement, and the semi-flexible pavement layer has the characteristics of oil stain resistance, colorability and the like. Compared with AC-16 and AC-20 used in the middle surface layer of the traditional asphalt mixture pavement structure, the semi-flexible material has better performance.
The semi-flexible pavement and the AC-16 pavement were compared in road performance by Marshall test. The method is characterized in that macroporous asphalt mixture matrixes with three porosities are selected to manufacture test pieces, and a Marshall test is carried out to obtain test results which are compared with the performance value of AC-16 of the traditional asphalt pavement.
TABLE 1 semi-flexible pavement layer Marshall test results
The stability and flow values of AC-16 are shown in Table 2.
Stability (KN) Flow value (0.1mm)
9.86 30.2
TABLE 2 Performance values for stability and flow values of AC-16
As can be seen from tables 1 and 2, the semi-flexible material has a higher stability and a reduced flow value, which indicates that the semi-flexible pavement has a stronger rigidity.
In one embodiment, shown in fig. 2, a geotextile 26 is placed over the base layer 21 and under the lower layer 23, and the base layer 21 and the lower layer 23 are separated by the geotextile 26 to reduce reflective cracking. Specifically, the geotextile 26 is laid on the surface of the base layer 21, and when the base layer 21 cracks, the geotextile 26 can effectively control the crack to be reflected to the lower surface layer, and can effectively protect the lower surface layer and the middle surface layer.
The utility model discloses set up semi-flexible pavement layer under between surface course 23 and surface course 25, utilize surface course 25 protection semi-flexible pavement layer, avoid it to produce fatigue fracture phenomenon, correspondingly, surface course 23 has also played the effect of protection semi-flexible pavement layer down, the cooperation sets up the crack that geotechnological cloth under surface course 23 can give isolated basic unit down, the influence of reflection crack to semi-flexible pavement layer has further been avoided, improve the life of semi-flexible pavement layer.
In one embodiment, as shown in fig. 1, the pavement structure further includes a cushion layer 21 disposed above the roadbed 10 and below the base layer 21, the cushion layer 21 being interposed between the roadbed 10 and the base layer 21.
Preferably, before constructing the bedding layer 21, the roadbed 10 is reinforced so that the strength of the roadbed is greater than or equal to 35 MPa.
Further, the cushion layer 21 is a crushed stone layer and has a thickness of 10cm to 30 cm. When the gravel layer is formed by paving the gravel, the gravel is compacted and flattened. Preferably, each layer is compacted during the laying process.
In one embodiment, the base course 22 is a cement stabilized macadam pavement layer having a thickness of between 30cm and 80 cm. The nominal maximum particle size of the cement stabilized macadam is selected according to the required level of highway, for example, when the cement stabilized macadam is used for a highway and a first level highway base course, the nominal maximum particle size is not more than 31.5 mm; when the composite material is used for second-level and below-second-level highway base courses, the nominal maximum particle size is not larger than 37.5 mm. The cement dosage added into the cement stabilized macadam is between 3% and 6%.
In one embodiment, the thickness of the lower layer 23 is between 6cm and 10 cm. The thickness of the middle layer 24 is between 3cm and 6 cm. The thickness of the upper layer 25 is between 1cm and 2.5 cm.
Wherein the lower layer 23 is a coarse-grained asphalt mixture, preferably one of AC-25, ATB-30 and ATB-25. When the middle surface layer 24 is constructed on the lower surface layer 23, the surface of the lower surface layer 23 is roughened to form a rough surface, and after the middle surface layer 24 is constructed, part of the cement-based adhesive cement in the middle surface layer 24 permeates into the rough surface, so that the connection strength between the middle surface layer 24 and the lower surface layer 23 is improved.
The middle surface layer 24 is made of semi-flexible materials, high adhesion is achieved between the macroporous asphalt mixture and the lower surface layer 23, bonding strength between the macroporous asphalt mixture and the lower surface layer 23 is high, and part of the cement-based adhesive cement poured in a matched mode permeates into the lower surface layer 23, so that bonding strength between the lower surface layer 23 and the middle surface layer 24 is further enhanced.
The upper surface layer 25 adopts a small-grain-size open-graded drainage asphalt mixture, adopts OGFC-5 material, and comprises 86-91% by weight of aggregate, 2-8% by weight of filler and 5-8% by weight of polymer modified asphalt, the nominal maximum grain size is 4.75mm, and the thickness of a pavement layer is 1.0-2.5 cm. The aggregate is basalt or diabase. The filler is a mixture of limestone mineral powder and cement, and the mass ratio of the limestone mineral powder to the cement is 1: 1-3: 1. The polymer modified asphalt is POE composite modified asphalt, the zero shear viscosity at 60 ℃ is more than or equal to 30000Pa.s, the softening point is more than or equal to 90 ℃, and the POE composite modified asphalt comprises hard asphalt, a modifier, a warm mixing agent and an interface reinforcing agent. The hard asphalt is No. 30 asphalt or No. 50 asphalt; the warm mixing agent is polyethylene wax; the interface reinforcing agent is a silane coupling agent. The modifier is polyolefin elastomer POE, the modifier accounts for 9-15 wt% of the hard asphalt, and the warm mixing agent accounts for 1-3 wt% of the hard asphalt; the interface reinforcing agent accounts for 0.4-1.0 wt% of the hard asphalt.
Grading range:
above-mentioned level joins in marriage skeleton interlocking stability, has great intercommunication porosity, high structure degree of depth, adopts POE composite modified asphalt and improves the asphalt film thickness, has higher anti loss ability that scatters to there are good cling compound performance and driving travelling comfort, effectively reduces surface course thickness and raw materials cost, reduces road maintenance cost and reduction driving noise simultaneously, and effectively reduces the splash that the vehicle went in the rainy day, and this layer is easily repaired.
Because of all containing the pitch material in upper surface course, well surface course and the lower surface course, in laying the pressure real-time, can ensure that three surface courses bond firmly, road surface structure's wholeness is good, and structural strength is high.
The utility model discloses a road surface structure has high strength, anti rut, anti lapse, outstanding high temperature stability and anti rut performance, has good anti cracking performance to low temperature resistant relatively, acidproof, heat-resisting, water-fast harm, long service life, difficult diffusion crack realize layering maintenance more easily. And the thickness of the whole surface layer in the pavement structure is greatly reduced, and the construction cost is greatly reduced.
The utility model also provides a construction method of high performance's compound semi-flexible surface course road surface structure, explains this construction method below.
The utility model discloses a construction method of high performance's compound semi-flexible surface course road surface structure, including following step: as shown in fig. 1, a foundation layer 22 is constructed on the roadbed 10;
laying a coarse-grained asphalt mixture on the base layer 22 to form a lower layer 23;
laying a semi-flexible material on the lower layer 23 to form a middle layer 24; and
laying a small-particle size open-graded drainage asphalt mixture on the middle surface layer 24 to form an upper surface layer 25.
The utility model discloses the road surface structure that forms provides anti rut and anti shear behavior through well surface course 24 and lower surface course 25, improves the intensity, rigidity, dynamic stability, the water stability etc. of road surface structure. The upper surface layer 25 can well protect the middle surface layer 24, and the upper surface layer 25 has durability and skid resistance, so that the service life of the pavement structure can be prolonged. In addition, the structure of each surface layer made of different materials is convenient to maintain, and the milling can be carried out in a layering mode, so that resources and working hours are saved.
In one embodiment, when laying the semi-flexible material, a macroporous asphalt mixture is laid on the lower layer 23 and compacted to form a macroporous asphalt matrix, and the porosity of the formed macroporous asphalt matrix is between 20% and 30%; and (3) pouring cement-based cement paste on the macroporous asphalt mixture matrix, wherein the poured cement-based cement paste flows into gaps of the macroporous asphalt mixture matrix and fills the gaps to form a compact and stable middle surface layer 24.
Wherein the weight percentage of the macroporous asphalt mixture matrix to the cement-based cement paste is 70-80 percent of the macroporous asphalt mixture matrix and 20-30 percent of the cement-based cement paste.
Specifically, the macroporous asphalt mixture adopts common road petroleum asphalt or modified asphalt as a binder, and the matrix is formed by mixing and stirring coarse aggregates, fine aggregates, active mineral powder and asphalt at a high temperature. The coarse aggregate is made of rolled macadam, and slaked lime or cement can be added to improve the adhesion between the coarse aggregate and the asphalt. The fine aggregate is made of machine-made sand or stone chips produced from alkaline rocks such as limestone.
The cement-based mortar is prepared on site, the raw materials comprise cement, fly ash, mineral powder and an additive, and sand, a polymer modifier and a coloring agent can be added, wherein the cement is portland cement or ordinary portland cement, and the fly ash is class I and class II fly ash; the mineral powder is limestone mineral powder; the additive comprises a water reducing agent, an early strength agent and an expanding agent; the added sand is clean river sand; the polymer modifier is selected from carboxylic styrene-butadiene emulsion. The cement-based mucilage has the water-to-glue ratio of 0.28-0.55, the usage amount of the fly ash is preferably 10-22%, the usage amount of the mineral powder is preferably 10-22%, and the total usage amount of the fly ash and the mineral powder is not more than 30%. When sand is added, the using amount of the sand is 10 to 29 percent; when the polymer modifier is added, the polymer-ash ratio is 10 percent; when the colorant is added, the amount of the colorant is 3-5% of the mass of the gelled material. The cement-based mortar has high strength and high fluidity and can flow into the gaps of the macroporous asphalt mixture matrix and fill the gaps.
The present invention has been described in detail with reference to the embodiments shown in the drawings, and those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details of the embodiments should not be construed as limitations of the invention, which are intended to be covered by the following claims.

Claims (9)

1. The utility model provides an ultra-thin high performance's compound semi-flexible surface course road surface structure, locates on the road bed, its characterized in that, road surface structure includes by lower supreme basic unit, lower surface course, well surface course and the upper surface course that sets gradually, wherein well surface course is semi-flexible surface course, the upper surface course is for the small-size footpath division level drainage bituminous mixture surface course, the surface course is coarse grain formula bituminous mixture surface course down.
2. The ultra-thin high performance composite semi-flexible pavement structure of claim 1, wherein the semi-flexible pavement layer comprises a macroporous asphalt matrix and a cement-based cement paste poured into voids of the macroporous asphalt matrix, and the porosity of the macroporous asphalt matrix is between 20% and 30%.
3. The ultra-thin high performance composite semi-flexible pavement structure of claim 2, wherein the cement-based grout partially penetrates into the voids of the lower layer to enhance the bond strength between the middle layer and the lower layer.
4. The ultra-thin high performance composite semi-flexible face pavement structure of claim 1 further comprising underlayments disposed above said subgrade and below said base course.
5. The ultra-thin high performance composite semi-flexible face pavement structure of claim 4, wherein the underlayment is a crushed stone layer having a thickness of between 10cm and 30 cm.
6. The ultra-thin high performance composite semi-flexible face layer pavement structure of claim 1, wherein the base course layer is a cement stabilized macadam pavement layer having a thickness of between 30cm and 80 cm.
7. The ultra-thin high performance composite semi-flexible pavement structure of claim 1, wherein the thickness of the lower layer is between 6cm and 10 cm.
8. The ultra-thin high performance composite semi-flexible face layer pavement structure of claim 1, wherein the thickness of the middle layer is between 3cm and 6 cm.
9. The ultra-thin high performance composite semi-flexible pavement structure of claim 1, wherein the upper layer has a thickness of between 1cm and 2.5 cm.
CN201921940885.8U 2019-11-11 2019-11-11 Ultrathin high-performance composite semi-flexible surface layer pavement structure Active CN211256538U (en)

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