CN212000441U - Novel road surface structure of urban heavy-load traffic - Google Patents
Novel road surface structure of urban heavy-load traffic Download PDFInfo
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- CN212000441U CN212000441U CN202020112298.6U CN202020112298U CN212000441U CN 212000441 U CN212000441 U CN 212000441U CN 202020112298 U CN202020112298 U CN 202020112298U CN 212000441 U CN212000441 U CN 212000441U
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Abstract
The utility model discloses a novel pavement structure of urban heavy traffic, which comprises a surface layer, a middle surface layer, a lower surface layer, a base layer and a subbase layer from top to bottom, wherein a rubber asphalt stress absorbing layer is arranged between the lower surface layer and the base layer, and the surface layer is composed of 4 cm-6 cm layers of semi-flexible material SFA13 sprayed with dew stone agent; the middle surface layer is composed of 6-8 cm of semi-flexible material SFA16 layer doped with phase change energy storage material; the lower surface layer is composed of an EME20 high-modulus asphalt mixed material layer of 8-10 cm, the base layer is composed of a C-B-1 cement stable graded broken stone or gravel layer of 18-20 cm doped bagasse fiber, waste rubber powder and water-absorbent resin polyacrylic acid sodium salt, and the subbase layer is composed of a 15-18 cm fabricated regular hexagonal prism porous cement concrete layer. The utility model discloses an integrate and optimize the road surface structure of mating formation, improved road structure's water stability, anti performance and durability of splitting, improved anti rutting in road surface, skid resistance and fatigue performance.
Description
Technical Field
The utility model belongs to the technical field of road engineering, especially, relate to a novel road surface structure of city heavy traffic.
Background
The intersection of road is mostly the main area that the vehicle opened and stops, brake, and the vehicle canalization is serious, and under the effect of various factors, phenomena such as hug, rut, wave appear very easily in traditional bituminous paving. Although the bus station only occupies a small section of the road, as an important part of the normal running of urban traffic, the asphalt pavement is very easy to induce track diseases due to the lateral force of turning when the bus enters or leaves the station, the frictional resistance when the bus stops, the frictional force when the bus is started and the like. Meanwhile, the bus lane is a completely canalized lane, the requirement on high-temperature deformation resistance of a road material is high, and the common asphalt pavement structure is easy to generate early diseases such as rutting, cracking and the like. Therefore, how to improve the high-temperature anti-rutting performance of the asphalt pavement and prolong the service life of the pavement becomes the key research point of road workers.
The publication number is CN206503047U, and the disclosed pavement structure of the bus special road surface relates to a wearing layer, a high-modulus anti-rutting deformation layer, an anti-fatigue layer and a semi-flexible anti-cracking layer. The bulletin number is CN206529665U, and the composite pavement structure of the urban public transport lane comprises an upper surface layer of a flexible pavement material, a middle surface layer of high-modulus asphalt concrete, a lower surface layer of continuous reinforced concrete and a semi-rigid cement-stabilized macadam base layer. The publication number is CN105481322A, and discloses a semi-flexible composite pavement structure and a preparation method thereof, wherein the semi-flexible composite pavement structure consists of 70-80% of a macroporous asphalt mixture matrix and 20-30% of rubber powder cement mortar. The publication No. CN101096837A discloses a construction method of a semi-flexible composite pavement, which comprises the steps of firstly making a macroporous matrix asphalt mixture, then pouring cement mortar taking cement as a main component into the macroporous matrix asphalt mixture, and carrying out surface treatment and curing for a certain time after paving. Publication No. CN106587842A discloses a preparation method of cement grouting material in raw materials of semi-flexible pavement materials. Publication No. CN208415027U discloses a semi-flexible composite pavement structure, the upper layer is a coating layer, and the lower layer is a composite layer of cement mixed mortar and asphalt material. Publication No. CN205134126U discloses a semi-flexible asphalt pavement base layer structure, which comprises an upper base layer and a lower base layer, wherein the lower base layer is a fly ash stabilized gravel layer, and the upper base layer is a foamed asphalt in-situ cold-recycled fly ash gravel layer. The publication No. CN205134128U discloses a semi-flexible asphalt pavement structure, which comprises an SMA-13, Sup-13 or AC-13 upper surface layer and a cement-emulsified asphalt cold-recycling asphalt mixture lower surface layer. Publication number CN103866667A, the disclosed semi-flexible heavy-duty pavement structure includes: the surface layer is high-viscosity modified asphalt mixture, the middle surface layer is high-modulus asphalt mixture, the lower surface layer is low-grade road asphalt dense-graded asphalt stabilized macadam, and the semi-flexible base layer is skeleton compact cement-emulsified asphalt concrete. The semi-flexible pavement structure mainly comprises two types, one is that the cement-based grouting material is filled in and fills the large-gap open-graded asphalt mixture, and the other is cement-emulsified asphalt concrete. Because the components of the cement-emulsified asphalt concrete are cement, aggregate and emulsified asphalt, the problems of compatibility and compatibility exist among raw materials, and meanwhile, the cement-emulsified asphalt concrete has the defects of low compressive strength, poor water stability, low viscosity strength and serious durability, is difficult to be competent for the surface layer of a road, and the cement-emulsified asphalt concrete has few reported application entity engineering at present. Therefore, the definition of semi-flexible materials (pavement) in the field of roads at home and abroad achieves a consensus that a composite material (pavement) is formed by pouring a cement-based grouting material with special performance into an asphalt mixture with an open-graded framework gap structure.
The problems of cracking resistance and durability of cement stabilized graded broken stones or gravels are poor, so that base cracking, pavement reflection cracking and the like are easily caused, the cement stabilized graded broken stones or gravels are the current chronic diseases of semi-rigid bases, and the cement stabilized graded broken stones or gravels always trouble road engineering personnel. Although the existing pavement structure scheme taking the semi-flexible pavement as the surface layer has a certain effect on track diseases of special sections of urban roads, the structure depth of the surface layer of the semi-flexible pavement is small and the anti-skid performance is poor due to the performance of cement-based grouting materials, construction processes and other reasons, and part of the grouting materials attached to the aggregate surface are easy to fall off after being hardened. Meanwhile, how to relieve the urban heat island effect and realize the recycling of wastes is one of the keys for implementing the sustainable development of traffic infrastructure construction in the current times.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a novel road surface structure of city heavy traffic, the utility model discloses an integration and optimization road surface pavement structural design have improved the water stability of basic unit, anti crack resistance and durability, avoid washing away harm, shrink fracture and reflection crack of basic unit, have improved anti rut in road surface, skid resistance and fatigue property to attenuate road surface thickness, reduced the cost of full life cycle engineering. In order to realize the purpose, the utility model discloses a following technological effect:
according to one aspect of the utility model, the novel road surface structure for urban heavy-duty traffic is provided, the road surface structure comprises a surface layer, a middle surface layer, a lower surface layer, a base layer and a subbase layer from top to bottom, a rubber asphalt stress absorbing layer is arranged between the lower surface layer and the base layer, wherein the surface layer is formed by 4 cm-6 cm layers of semi-flexible material SFA13 sprayed with dew stone agent; the middle surface layer is composed of 6-8 cm of semi-flexible material SFA16 layer doped with phase change energy storage material; the lower surface layer is composed of an EME20 high-modulus asphalt mixed material layer of RAP with the high proportion of 8-10 cm, the base layer is composed of a C-B-1 cement stable graded broken stone or gravel layer doped with bagasse fiber, waste rubber powder and water-absorbent resin polyacrylate sodium salt, and the base layer is composed of a 15-18 cm fabricated regular hexagonal prism-shaped porous cement concrete layer.
Above-mentioned scheme is further preferred be provided with first glutinous layer between superficial layer and the well surface course, be provided with the glutinous layer of second between well surface course and the lower surface course, first glutinous layer and second glutinous layer are SBS modified asphalt sticky layer or modified emulsification asphalt sticky layer, and its unit area volume of scattering is 0.7 ~ 0.8kg/m2。
Preferably, the thickness of the rubber asphalt stress absorbing layer is 0.8 cm-1.3 cm; the absorbed layer can restrain the development of reflection crack between surface course and the basic unit down, prevents that moisture from invading between the road surface texture layer, plays the waterproof damage effect, and meanwhile, rubber asphalt possesses superstrong viscidity, strengthens bonding between the layer, is favorable to the road surface texture atress.
In a further preferred mode of the above aspect, the lower half portion of the underlayer is provided with a gap along the bottom direction, the distance between adjacent gaps is 0.6m to 1.5m, and the width of the gap is 0.5cm to 2 cm.
Preferably, the semi-flexible material SFA13 is prepared by pouring and bonding rubber asphalt and mixture pouring cement grout material with a porosity of 20-28%, and the semi-flexible material SFA13 is prepared by pouring and bonding the rubber asphalt and the mixture pouring cement grout material, wherein the porosity of the rubber asphalt mixture is 20-28%, and the rubber asphalt mixture is prepared by mixing, paving and compacting the following raw materials in percentage by weight: aggregate: mineral powder: rubber asphalt is 100: 3-5: 3.5 to 5.5; the cement grouting material is prepared from the following raw materials in parts by weight: 30-50 parts of ordinary portland cement, 5-10 parts of class II fly ash, 10-15 parts of fine sand, 0.5-2 parts of sulfate early strength agent, 0.1-0.3 part of polycarboxylic acid water reducing agent, 1-6 parts of saponin air entraining agent sodium carbonate, 1-4 parts of carboxylic styrene-butadiene latex, 0.1-0.4 part of calcium carbonate and 15-35 parts of water.
Preferably, in the above scheme, the semi-flexible material SFA16 layer of the phase change energy storage material is prepared by pouring and bonding a rubber asphalt mixture and a cement grout containing the phase change energy storage material with a porosity of 20% to 28%, the semi-flexible material SFA16 of the phase change energy storage material is prepared by pouring the cement grout containing the phase change energy storage material into the rubber asphalt mixture, the porosity of the rubber asphalt mixture is 20% to 28%, and the rubber asphalt mixture is prepared by mixing, paving and compacting the following raw materials in parts by weight: mineral powder: rubber asphalt is 100: 3-5: 3.5 to 5.5; the cement grouting material of the phase change energy storage material is prepared from the following raw materials in parts by weight: 30-50 parts of ordinary portland cement, 5-10 parts of class II fly ash, 5-10 parts of fine sand, 0.5-2 parts of a sulfate early strength agent, 0.1-0.3 part of a polycarboxylic acid water reducing agent, 1-6 parts of sodium carbonate, 0.1-0.4 part of calcium carbonate, 12-32 parts of water and 3-5 parts of a phase change energy storage material.
In a further preferable mode of the scheme, an emulsified asphalt layer is wrapped outside a semi-flexible material SFA16 layer of the phase change energy storage material, the phase change energy storage material is prepared by taking expanded graphite as an energy storage carrier and adding one or more of paraffin, fatty acid and polyethylene glycol as a phase change material, and the mass ratio of the phase change material to the energy storage carrier is 40-80%.
Preferably, the EME20 high modulus asphalt mixture of the high proportion RAP is prepared by mixing, paving and compacting the following raw materials in percentage by weight: aggregate: mineral powder: low grade road asphalt 100: 5-6: 5.5-6.5, wherein the aggregate comprises 25-50% of old RAP material.
In a further preferable mode of the scheme, the base layer is formed by mixing, paving and compacting bagasse fibers, waste rubber powder and C-B-1 cement-stabilized graded broken stones or gravel materials of water-absorbent resin polyacrylic acid sodium salt, and the base layer is formed by mixing, paving and compacting the following raw materials in percentage by weight: aggregate: ordinary portland cement: bagasse fiber: waste rubber powder: water-absorbent resin polyacrylic acid sodium salt 100: 4-6.5: 0.3-0.8: 0.5-3.5: 0.1 to 0.3.
According to the scheme, the strength of the assembled regular hexagonal prism-shaped porous cement concrete with the thickness of 15-18 cm is further optimizedThe degree grade is not less than C20, the porosity is 10-15%, the assembled regular hexagonal prism porous cement concrete is composed of the following raw materials, 1629kg/m of coarse aggregate of 5-10 mm3503kg/m of cement3150.9kg/m of water32.0kg/m of water reducing agent315.1kg/m of rubber powder3And polyvinyl alcohol powder 4.0kg/m3(ii) a Wherein the coarse aggregate is prepared from natural coarse aggregate 814.5-1140.3 kg/m3And 488.7-814.5 kg/m of recycled coarse aggregate3And (4) forming.
To sum up, because the utility model adopts the above technical scheme, the utility model discloses following technological effect has:
(1) the utility model discloses mainly adopt the semi-flexible road surface, cement concrete pavement and bituminous paving form combined type road surface structure, the top layer through using the exposed stone agent to semi-flexible material carries out exposed stone and handles, it is inhomogeneous to have solved traditional semi-flexible road surface and scraped thick liquid, the poor scheduling problem of cling compound performance, improve bituminous paving's anti rutting performance, and use n-dodecane, n-tetradecane, and the composite phase change material that low density polyethylene prepared mixes semi-flexible material, can reduce the road surface temperature when high temperature, alleviate urban heat island effect, can promote road surface temperature during low temperature, alleviate the influence of freezing to road surface driving safety.
(2) The bagasse fiber, the waste rubber powder and the high-molecular water-absorbent resin are doped into the cement stabilized macadam, so that the water stability, the crack resistance and the durability of the base layer can be improved, the shrinkage cracking and the road surface reflection cracking of the base layer are reduced or avoided, the waste can be repeatedly utilized, the natural resources are saved, and the sustainable development of traffic infrastructure construction is realized;
(3) the utility model discloses a positive hexagonal prism form porous cement concrete of assembled uses old and useless cement concrete regeneration coarse aggregate as one of the main raw materials, has realized that discarded object utilizes in large measure, improves urban road construction efficiency greatly, and positive hexagonal prism form, porous cement concrete prefabricated plate can reinforce the transmission of load, solves the problem that basic unit lower part water harmed.
Drawings
FIG. 1 is a schematic structural diagram of a novel road surface structure of urban heavy traffic of the present invention;
FIG. 2 is a top view of the assembled regular hexagonal prism porous cement concrete;
FIG. 3 is a top view of an assembled regular hexagonal prism porous cement concrete assembly;
in the drawing, a surface layer 1, a first sticky layer 2, a middle surface layer 3, a second sticky layer 4, a lower surface layer 5, a rubber asphalt stress absorbing layer 6, a base layer 7 and a subbase layer 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and by referring to preferred embodiments. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
in the utility model discloses in, because cement stable gradation rubble or gravel anti-cracking performance is not good, the durability is not enough, easily leads to basic unit fracture and road surface reflection crack scheduling problem, basic unit ponding induces the basic unit and erodes the destruction, and the durability is not enough, to urban road special section rut disease, set up subbase 8 in the below of basic unit 7, as shown in fig. 1, fig. 2 and fig. 3, subbase 8 is by 15cm ~ 18cm assembled regular hexagonal prism form porous cement concrete; gaps 9 are formed in the lower half portion of the sub-base layer 8 along the bottom direction, the distance between every two adjacent gaps 9 is 0.6m-1.5m (namely, the gaps 9 are formed between every two adjacent regular hexagonal prism-shaped porous cement concretes), and the width of each gap 9 is 1.2, so that redundant water in the fabricated porous cement concrete 5 can permeate into a drainage ditch or other auxiliary drainage equipment along the gaps 50.
The utility model discloses in, semi-flexible material SFA13 is poured the preparation of cement grout material to rubber asphalt mixture and forms, and wherein, rubber asphalt mixture's void fraction 20% ~ 28%, rubber asphalt mixture mixes the compaction that paves by the raw materials of following weight ratio and forms: aggregate: mineral powder: rubber asphalt is 100: 3-5: 3.5 to 5.5; the cement grouting material is prepared from the following raw materials in parts by weight: 30-50 parts of ordinary portland cement, 5-10 parts of class II fly ash, 10-15 parts of fine sand, 0.5-2 parts of sulfate early strength agent, 0.1-0.3 part of polycarboxylic acid water reducing agent, 1-6 parts of saponin air entraining agent sodium carbonate, 1-4 parts of carboxylic styrene-butadiene latex, 0.1-0.4 part of calcium carbonate and 15-35 parts of water.
The semi-flexible material SFA16 of the phase change energy storage material is prepared by pouring cement grouting material containing the phase change energy storage material into a rubber asphalt mixture, the design target void ratio of the rubber asphalt mixture is 20-28%, the rubber asphalt mixture is prepared by mixing, paving and compacting the following raw materials in percentage by weight, and aggregates: mineral powder: rubber asphalt is 100: 3-5: 3.5 to 5.5; the cement grouting material of the phase change energy storage material is prepared from the following raw materials in parts by weight: 30-50 parts of ordinary portland cement, 5-10 parts of class II fly ash, 5-10 parts of fine sand, 0.5-2 parts of a sulfate early strength agent, 0.1-0.3 part of a polycarboxylic acid water reducing agent, 1-6 parts of sodium carbonate, 0.1-0.4 part of calcium carbonate, 12-32 parts of water and 3-5 parts of a phase change energy storage material;
the phase-change energy storage material is prepared by wrapping an emulsified asphalt layer outside the phase-change energy storage material, taking expanded graphite as an energy storage carrier and adding one or more of paraffin, fatty acid and polyethylene glycol as a phase-change material, wherein the mass ratio of the phase-change material to the energy storage carrier is 40-80%.
The EME20 high-modulus asphalt mixture with high RAP ratio is prepared by mixing, paving and compacting the following raw materials in percentage by weight: aggregate: mineral powder: low grade road asphalt 100: 5-6: 5.5-6.5, wherein the aggregate comprises 25-50% of old RAP material.
The base layer 7 is formed by mixing, paving and compacting bagasse fibers, waste rubber powder and C-B-1 cement stable graded broken stones or gravel materials of water-absorbent resin polyacrylic acid sodium salt, and the base layer 7 is formed by mixing, paving and compacting the following raw materials in percentage by weight: aggregate: ordinary portland cement: bagasse fiber: waste rubber powder: water-absorbent resin polyacrylic acid sodium salt 100: 4-6.5: 0.3-0.8: 0.5-3.5: 0.1 to 0.3.
The strength grade of the assembled regular hexagonal prism-shaped porous cement concrete with the thickness of 15-18 cm is not smaller than C20, the porosity is 10% -15%, and the assembled regular hexagonal prism-shaped porous cement concrete is composed of the following raw materials, wherein 1629kg/m of 5-10 mm thick aggregate is 1629kg/m3503kg/m of cement3150.9kg/m of water32.0kg/m of water reducing agent315.1kg/m of rubber powder3And polyvinyl alcohol powder 4.0kg/m3(ii) a Wherein the coarse aggregate is prepared from natural coarse aggregate 814.5-1140.3 kg/m3And 488.7-814.5 kg/m of recycled coarse aggregate3And (4) forming. The utility model discloses an old cement concrete waste material had both improved resource recycle and cyclic utilization level as the coarse aggregate raw and other materials of the positive hexagonal prism form porous cement concrete of assembled for the construction progress again, strengthens engineering quality's control and avoids basic unit's ponding to induce the water damage, and the extension road service life realizes the sustainable development of traffic infrastructure construction. Generally speaking, the pavement paving structure belongs to a novel long-service-life pavement structure form, has excellent road performance and good durability, is an effective technical means for solving the problem of track diseases of the pavement, reduces the thickness of the pavement and reduces the thickness of the pavementThe cost of the life cycle engineering conforms to the times of people-oriented, energy-saving, emission-reduction, resource recycling and environmental protection.
The utility model discloses in, aggregate is basalt or limestone or granite, must take the measure of stripping agent in order to improve pitch and the adhesion of gathering materials to granite aggregate, the powdered ore be limestone powder, and gather materials and the nature of powdered ore need satisfy the corresponding technical requirement of current "highway bituminous paving construction technical specification" (JTG F40-2004), the concrete requirement is as follows: the mineral aggregate mixing ratio of the different structural layers corresponds to the following mesh sizes of 26.5, 19, 16, 13.2, 9.5, 4.75, 2.36, 1.18, 0.6, 0.3, 0.15 and 0.075 mm; for the semi-flexible material SFA13, the weight percentage passage rate is as follows in sequence: 100. 100, 90-100, 50-80, 12-30, 10-22, 6-18, 4-15, 3-12, 3-8 and 2-6; for the semi-flexible material SFA16, the weight percentage passage rate is as follows in sequence: 100. 100, 90-100, 70-90, 45-70, 12-30, 10-22, 6-18, 4-15, 3-12, 3-8 and 2-6; for the high modulus asphalt mixture EME20, the weight percentage passage rates are as follows in sequence: 100. 90-100, 80-95, 70-85, 60-75, 40-55, 30-40, 20-30, 15-20, 10-16, 6-10, 4-8; for cement stable graded broken stone or gravel C-B-1, the weight percentage passage rates are as follows in sequence: 100. 82-86, 73-79, 65-72, 53-62, 35-45, 22-31, 13-22, 8-15, 5-10, 3-7 and 2-5; the aggregate is basalt, limestone or granite, a measure for improving the adhesion of asphalt and the aggregate must be taken for granite aggregate by using a stripping agent, the mineral powder is limestone powder, and the properties of the aggregate and the mineral powder need to meet the requirements of the current specification, wherein the grading range of the mineral aggregate of the pavement structure is shown in Table 1.
Table 1: mass percentage of mineral material passing through each mesh (mm)
According to another aspect of the utility model, still provide the construction method of the novel road surface structure of urban heavy traffic, the construction method of road structure carries out according to following step:
1) and determining the mineral aggregate gradation: the new aggregate of the high-modulus asphalt mixture EME20 is a combination of basalt and limestone, the filler is limestone mineral powder, the old material comes from the middle surface layer of the asphalt pavement, the gradation after extraction by trichloroethylene is shown in Table 2, wherein the mixing amount of the old material is 30%, and the mass fraction of asphalt in the old material is 4.6%.
Table 2: mass percentage of RAP old material passing through each screen hole (mm)
| Mesh opening mm | 26.5 | 19 | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent passing through | 100 | 100 | 100 | 96 | 92 | 74 | 55 | 40 | 32 | 25 | 18 | 12 |
The grading of other mixtures is shown in Table 3, the aggregate adopts limestone or basalt, the filler is limestone mineral powder, and the properties of the limestone mineral powder meet the national standard requirements.
Table 3: mass percentage of mineral material passing through each mesh (mm)
The EME20 high-modulus asphalt mixture with high proportion RAP (25% -50%) is prepared by mixing, paving and compacting the following raw materials in percentage by weight: aggregate: mineral powder: low grade road asphalt 100: 5-6: 5.5-6.5, wherein the aggregate comprises 25% -50% of old RAP material. The base layer 6 is formed by mixing, paving and compacting bagasse fibers, waste rubber powder and C-B-1 cement-stabilized graded broken stones or gravel materials of water-absorbent resin polyacrylic acid sodium salt, and the base layer 6 is formed by mixing, paving and compacting the following raw materials in percentage by weight: aggregate: ordinary portland cement: bagasse fiber: waste rubber powder: water-absorbent resin polyacrylic acid sodium salt 100: 4-6.5: 0.3-0.8: 0.5-3.5: 0.1 to 0.3.
2) And preparing auxiliary materials:
preparation of phase change energy storage material
The phase-change energy storage material expanded graphite is an energy storage carrier, one or more of paraffin, fatty acid, polyethylene glycol and the like are used as the phase-change material, the mass ratio of the phase-change material to the energy storage carrier is 40-80%, and emulsified asphalt is wrapped outside the phase-change material expanded graphite to further ensure that no liquid leaks in the phase-change process; the type of the phase-change material is determined according to the climate condition and the temperature regulation target of the road, taking the road in Guangxi area as an example, the temperature in summer in the area is higher, the heat is abundant, and the track of the pavement disease is more prominent, so the phase-change temperature obtained by selecting one or a plurality of phase-change materials is preferably 30-50 ℃, polyethylene glycol is selected as the phase-change material, and the preparation process of the energy storage carrier (phase-change energy storage) material is as follows: firstly, weighing 100g of expanded graphite, 400g of polyethylene glycol and 800-1200 g of emulsified asphalt for standby, placing the expanded graphite in an oven at 70-80 ℃, and heating for 10-12 h to ensure that no moisture exists in the expanded graphite; secondly, dissolving polyethylene glycol in distilled water at 50-60 ℃ to prepare polyethylene glycol aqueous solution; thirdly, mixing the dried expanded graphite with a polyethylene glycol aqueous solution, and ultrasonically oscillating for 0.5h at the temperature of 60 ℃; placing the mixed solution of the expanded graphite and the polyethylene glycol in a vacuum drying oven at 80 ℃, and vacuumizing for 4.5 hours to fill the pores of the expanded graphite with the polyethylene glycol, thereby obtaining the expanded graphite-polyethylene glycol composite material; and finally, slowly adding the expanded graphite-polyethylene glycol composite material into the emulsified asphalt, synchronously stirring and controlling the stirring speed to be from slow to fast, when the expanded graphite-polyethylene glycol composite material is completely added, rotating at a constant speed for 0.5h and stirring at a speed of 1200 rpm so that the emulsified asphalt can fully wrap the composite material, thereby preparing the polyethylene glycol phase-change energy storage material, wherein the total mass fraction of the emulsified asphalt and the polyethylene glycol phase-change energy storage material is 80% (accounting for 80% of the total mass).
Preparing cement grouting material:
according to the weight ratio of raw materials in the cement grouting material, 42% of ordinary portland cement, 9% of class II fly ash and 12% of fine sand are mixed and stirred for 2min, then 1% of sulfate early strength agent, 0.2% of polycarboxylic acid water reducing agent, 2.5% of saponin air entraining agent sodium carbonate, 3% of carboxylic styrene-butadiene latex, 0.3% of calcium carbonate and 30% of water are added, mixed and stirred for 3min, and the preparation of the cement grouting material can be completed after the mixture materials are uniform.
Preparing phase change energy storage cement grouting material:
the phase-change energy storage material with a certain mass is prepared according to the method, and considering that the adverse effect is generated on the mechanical strength and durability of the mixture when the mixing amount of the phase-change energy storage material is high, and the compatibility problem of the phase-change energy storage material and the cement grouting material, the phase-change energy storage cement grouting material needs to be prepared according to the following method: firstly, 3% of phase change energy storage material, 42% of ordinary portland cement, 9% of fly ash and 12% of fine sand are mixed and stirred for 3min, then 1% of sulfate early strength agent, 0.2% of polycarboxylic acid water reducing agent, 2.5% of saponin air entraining agent sodium carbonate, 3% of carboxylic styrene-butadiene latex, 0.3% of calcium carbonate and 30% of water are added, and the mixture is stirred for 5min after mixing, so that the phase change energy storage material can be uniformly dispersed in the cement grouting material.
3) Pavement structure construction
Firstly, an assembled regular hexagonal prism-shaped porous cement concrete subbase layer: the assembled regular hexagonal prism-shaped porous cement concrete is prepared from 1629kg/m of 5-10 mm coarse aggregate3503kg/m of cement3150.9kg/m of water32.0kg/m of water reducing agent315.1kg/m of rubber powder3And polyvinyl alcohol powder 4.0kg/m3(ii) a Wherein the coarse aggregate is prepared from natural coarse aggregate 814.5-1140.3 kg/m3And 488.7-814.5 kg/m of recycled coarse aggregate3The components are mixed according to the proportion, maintained and transported to a construction site. The flatness of the regular hexagonal prism-shaped porous cement concrete needs to be controlled, and the joints of the assembled plates are filled with cement mortar, so that a good working surface is improved for base layer construction.
Paving a cement stabilized macadam base layer: according to the grading of the cement stable graded broken stone mineral aggregate, ordinary portland cement, bagasse fiber, waste rubber powder and high molecular water-absorbing resin sodium polyacrylate are mixed according to the weight ratio of 100: 5: 0.6: 2.53: 0.2 of the materials are mixed, paved and rolled to form a cement stabilized graded macadam foundation 7, wherein the ordinary Portland cement is P.O 42.5.5, and the basic properties of bagasse fibers and waste rubber powder particles meet the national standard requirements. The utility model discloses mix bagasse fibre, old and useless rubber powder and polymer water-absorbing resin in the rubble is stabilized to cement, not only can improve the water stability, crack resistance and the durability of basic unit, reduce or avoid the shrinkage cracking and the road surface reflection crack of basic unit.
Paving a stress absorption layer: the stress absorbing layer cementing material adopts rubber asphalt, the aggregate should adopt gravel particles which are hard and clean and have the shape close to a cube, the basic properties of the rubber asphalt and the aggregate meet the requirements of the national specification, the spreading amount of the rubber asphalt is 2.5kg/m2, the stress absorbing layer 6 is paved by spreading the rubber asphalt, paving and rolling the gravel, and the thickness of the stress absorbing layer is 10 mm.
Paving the following layers: on the stress absorbing layer 6, the technical indexes of the low-grade road asphalt (the basic properties are shown in the table 4) and the EME20 graded paving high-modulus asphalt mixture meet the requirements of the table 5, and a lower surface layer 5 is formed. Wherein the mass ratios of the materials of the lower surface layer 5 are aggregates: mineral powder: low grade road asphalt 100: 5: 6.2, wherein the aggregate comprises the old RAP aggregate and the new aggregate in a mass ratio of 30: 70.
table 4: technical index of low-grade road asphalt
| Test indexes | Unit of | Results | Test indexes | Unit of | Results |
| Penetration (25 ℃ C.) | 0.1mm | 24 | Softening point (R)&B) | ℃ | 64 |
| Dynamic viscosity at 60 DEG C | Pa·s | 2370 | Ductility at 15 DEG C | cm | 53 |
| Fras brittle point | ℃ | -3 | Residual rate of penetration of TFOT | ％ | 78 |
| Wax content (distillation method) | ％ | 1.6 | TFOT mass change | ％ | 0.05 |
Table 5: technical indexes and requirements of high modulus asphalt mixture
| Technical index | Test method | Required value |
| Strength ratio | Freeze-thaw cleavage test JTJ052-2000 | ≥75％ |
| Degree of dynamic stability | Rut test T0719-2000 | >3000 times/mm |
| Modulus of elasticity | Two-point flexural modulus test NFP98260-2 | ≥14 000MPa |
| Bending strain | Low-temperature trabecula bending test JTJ052-2000 | ≥2 000×106 |
Paving the adhesive layer and the middle layer: for the wholeness of guarantee road surface structure be provided with first glutinous layer 2 between superficial layer 1 and the well surface course 3, be provided with the glutinous layer 4 of second between well surface course 3 and the lower surface course 5, first glutinous layer 2 and the glutinous layer 20 of second are SBS modified asphalt and glue layer or modified emulsification asphalt and glue layer, and its unit area volume of scattering cloth amount 0.7 ~ 0.8kg/m2The amount of the dispersion per unit area is 0.73kg/m2. Spreading the second adhesive layer 4 by rubber asphalt and SFA16 grade to form an asphalt mixture with a void ratio of 25%, and pouring into the voidThe cement grouting material containing the phase change energy storage material is used for forming the middle surface layer 3, wherein the raw materials of the large-gap asphalt mixture of the middle surface layer 3 are as follows: mineral powder: the rubber asphalt comprises the following materials in percentage by mass: mineral powder: rubber asphalt is 100: 3.7: 4.2, wherein the rubber asphalt properties are shown in table 6.
Table 6: technical index of rubber asphalt
| Test indexes | Unit of | Results | Test indexes | Unit of | Results |
| Penetration (25 ℃ C.) | 0.1mm | 65 | Softening point (R)&B) | ℃ | 68 |
| Dynamic viscosity at 180 DEG C | Pa·s | 3.2 | Ductility (5 ℃, 1cm/min) | cm | 12 |
| Elastic recovery (25 ℃ C.) | ％ | 63 |
Spreading the surface layer: on the first sticky layer 2, rubber asphalt (basic properties are shown in table 6) and SFA13 are graded and paved to form an asphalt mixture with a porosity of 25%, a dew stone agent is sprayed to form a surface layer 1 after cement grouting materials are poured into gaps of the asphalt mixture, wherein the surface layer 1 is made of a semi-flexible material SFA13 of spraying the dew stone agent with the thickness of 4 cm-6 cm, the large-gap asphalt mixture of the surface layer 1 is made of aggregate, mineral powder and rubber asphalt, and the mass ratio of the raw materials is as follows: 100: 4.0: 4.4, the concrete stone exposing process is as follows: after the cement grouting material is poured, the slurry is scraped, and when the water film on the road surface disappears, the stone exposing agent is uniformly sprayed, wherein the spraying amount is 150g/m2Spraying the dewstone agent for two times, wherein 68% of the dosage of the dewstone agent is sprayed for the first time, 32% of the dosage of the dewstone agent is sprayed for the second time, the time interval of the spraying for the two times is 5min, and after the spraying is finished, covering a plastic film on the road surface for curing; scratching the road surface by using a sharp object, wherein the trace is shallow but clearly visible, and the edge is basically not damaged, namely the proper brushing time is obtained, at the moment, redundant cement slurry on the road surface is washed away, and then, coating a film for carrying out secondary curing for 4 hours; after the pavement of the road structure is finished, the technical indexes of the paved road surface are tested and detected according to requirements, and the transverse force coefficient SFC6067, build depth TD of 0.65mm, permeability coefficient (ml/min): is impermeable to water; the temperature reduction range of the pavement surface layer is 2-5 ℃; the utility model adopts the above proposal to carry out stone exposing treatment on the surface layer of the semi-flexible material by using the stone exposing agent, thus solving the problems of uneven slurry scraping, poor anti-skid property and the like of the traditional semi-flexible pavement; the phase-change energy storage material is doped into the semi-flexible material,the road surface temperature can be reduced at high temperature, the urban heat island effect is relieved, the road surface temperature can be increased at low temperature, and the influence of freezing on the road surface driving safety is relieved.
Example 2, the surface layer 1 consists of a 4cm semiflexible material SFA13 sprayed with dew stone agent; the middle surface layer 3 is formed by 6cm of semi-flexible material SFA16 doped with the phase change energy storage material; the lower surface layer 5 is composed of 10cm high-proportion RAP EME20 high-modulus asphalt mixture, the base layer 7 is composed of 18cm bagasse fiber, waste rubber powder and water-absorbent resin sodium polyacrylate salt-doped C-B-1 cement-stabilized graded broken stone or gravel, a first adhesive layer 2 is arranged between the surface layer 1 and the middle surface layer 3, a second adhesive layer 4 is arranged between the middle surface layer 3 and the lower surface layer 5, the first adhesive layer 2 and the second adhesive layer 4 are SBS modified asphalt sticky layers or modified emulsified asphalt sticky layers, and the spreading amount per unit area is 0.8kg/m2The thickness of the rubber asphalt stress absorbing layer 6 is 0.8 cm; the subbase layer 8 is made of 15cm fabricated regular hexagonal prism-shaped porous cement concrete; the lower half part of the subbase layer 8 is provided with a gap 9 along the bottom direction, the distance of the gap 9 between adjacent gaps is 0.6m, and the width of the gap 9 is 0.5 cm.
In the embodiment of the utility model, the SFA13 is prepared by pouring cement grout into rubber asphalt mixture, wherein the void ratio of rubber asphalt mixture is 20%, and the rubber asphalt mixture is formed by mixing, paving and compacting the following raw materials by weight ratio: aggregate: mineral powder: rubber asphalt is 100: 3: 3.5; the cement grouting material is prepared from the following raw materials in parts by weight: 50 parts of ordinary portland cement, 5 parts of grade II fly ash, 10 parts of fine sand, 0.5 part of sulfate early strength agent, 0.1 part of polycarboxylic acid water reducing agent, 1 part of saponin air entraining agent sodium carbonate, 1 part of carboxylic styrene-butadiene latex, 0.1 part of calcium carbonate and 15 parts of water. The semi-flexible material SFA16 of the phase change energy storage material is prepared by pouring cement grouting material containing the phase change energy storage material into a rubber asphalt mixture, the design target void ratio of the rubber asphalt mixture is 20%, the rubber asphalt mixture is prepared by mixing, paving and compacting the following raw materials in percentage by weight, and aggregates are formed: mineral powder: rubber asphalt is 100: 3: 3.5; the cement grouting material of the phase change energy storage material is prepared from the following raw materials in parts by weight: 30 parts of ordinary portland cement, 5 parts of grade II fly ash, 5 parts of fine sand, 0.5 part of sulfate early strength agent, 0.1 part of polycarboxylate water reducing agent, 1 part of sodium carbonate, 0.1 part of calcium carbonate, 12 parts of water and 3 parts of phase change energy storage material; the phase change energy storage material is prepared by wrapping an emulsified asphalt layer outside the phase change energy storage material, taking expanded graphite as an energy storage carrier and adding one or more of paraffin, fatty acid and polyethylene glycol as a phase change material, wherein the mass ratio of the phase change material to the energy storage carrier is 40%. The preparation process of the energy storage carrier (phase change energy storage) material is as follows: placing the expanded graphite in a 70 ℃ oven, and heating for 12 hours to ensure that no moisture exists in the expanded graphite; secondly, dissolving polyethylene glycol in distilled water at 50 ℃ to prepare polyethylene glycol aqueous solution; thirdly, mixing the dried expanded graphite with a polyethylene glycol aqueous solution, and ultrasonically oscillating for 20min at 60 ℃; placing the mixed solution of the expanded graphite and the polyethylene glycol in a vacuum drying oven at 80 ℃, and vacuumizing for 4 hours to fill the pores of the expanded graphite with the polyethylene glycol so as to obtain the expanded graphite-polyethylene glycol composite material; and finally, slowly adding the expanded graphite-polyethylene glycol composite material into the emulsified asphalt, synchronously stirring and controlling the stirring speed to be from slow to fast, when the expanded graphite-polyethylene glycol composite material is completely added, rotating at a constant speed for 0.5h and stirring at a speed of 1000 rpm so that the emulsified asphalt can fully wrap the composite material, thereby preparing the polyethylene glycol phase-change energy storage material, wherein the total mass fraction of the emulsified asphalt and the polyethylene glycol phase-change energy storage material is 80%.
Example 3, the surface layer 1 consists of 6cm of a semi-flexible material SFA13 sprayed with a dew stone agent; the middle surface layer 3 is formed by 8cm of semi-flexible material SFA16 doped with the phase change energy storage material; the lower surface layer 5 is composed of an EME20 high-modulus asphalt mixture of 8cm high-proportion RAP, the base layer 7 is composed of 20cm C-B-1 cement-stabilized graded broken stone or gravel mixed with bagasse fibers, waste rubber powder and water-absorbent resin sodium polyacrylate, a first adhesive layer 2 is arranged between the surface layer 1 and the middle surface layer 3, a second adhesive layer 4 is arranged between the middle surface layer 3 and the lower surface layer 5, the first adhesive layer 2 and the second adhesive layer 4 are SBS modified asphalt sticky layers or modified emulsified asphalt sticky layers, and the spreading amount per unit area is 0.7kg/m2The thickness of the rubber asphalt stress absorbing layer 6 is 1.3 cm; the subbase layer 8 is made of 18cm fabricated regular hexagonal prism-shaped porous cement concrete; the lower half part of the subbase layer 8 is provided with a gap 9 along the bottom direction, the distance of the gap 9 between adjacent parts is 1.5m, and the width of the gap 9 is 2 cm.
In the embodiment of the utility model, the SFA13 is prepared by pouring cement grout into rubber asphalt mixture, wherein the void ratio of rubber asphalt mixture is 28%, and the rubber asphalt mixture is formed by mixing, paving and compacting the following raw materials by weight ratio: aggregate: mineral powder: rubber asphalt is 100: 5: 5.5; the cement grouting material is prepared from the following raw materials in parts by weight: 30 parts of ordinary portland cement, 10 parts of II-grade fly ash, 15 parts of fine sand, 2 parts of sulfate early strength agent, 0.3 part of polycarboxylic acid water reducing agent, 6 parts of saponin air entraining agent sodium carbonate, 4 parts of carboxylic styrene-butadiene latex, 0.4 part of calcium carbonate and 35 parts of water.
The semi-flexible material SFA16 of the phase change energy storage material is prepared by pouring cement grouting material containing the phase change energy storage material into a rubber asphalt mixture, the design target void ratio of the rubber asphalt mixture is 28%, the rubber asphalt mixture is prepared by mixing, paving and compacting the following raw materials in percentage by weight, and aggregates are formed: mineral powder: rubber asphalt is 100: 5: 5.5; the cement grouting material of the phase change energy storage material is prepared from the following raw materials in parts by weight: 50 parts of ordinary portland cement, 10 parts of II-grade fly ash, 10 parts of fine sand, 2 parts of sulfate early strength agent, 0.4 part of polycarboxylic acid water reducing agent, 6 parts of sodium carbonate, 0.4 part of calcium carbonate, 32 parts of water and 5 parts of phase change energy storage material; the phase change energy storage material is prepared by wrapping an emulsified asphalt layer outside the phase change energy storage material, taking expanded graphite as an energy storage carrier and adding one or more of paraffin, fatty acid and polyethylene glycol as a phase change material, wherein the mass ratio of the phase change material to the energy storage carrier is 80%. The preparation process of the energy storage carrier (phase change energy storage) material is as follows: placing the expanded graphite in an oven at 80 ℃, and heating for 10 hours to ensure that no moisture exists in the expanded graphite; secondly, dissolving polyethylene glycol in distilled water at 60 ℃ to prepare polyethylene glycol aqueous solution; thirdly, mixing the dried expanded graphite with a polyethylene glycol aqueous solution, and performing ultrasonic oscillation for 0.8h at the temperature of 60 ℃; placing the mixed solution of the expanded graphite and the polyethylene glycol in a vacuum drying oven at 80 ℃, and vacuumizing for 6 hours to fill the pores of the expanded graphite with the polyethylene glycol so as to obtain the expanded graphite-polyethylene glycol composite material; and finally, slowly adding the expanded graphite-polyethylene glycol composite material into the emulsified asphalt, synchronously stirring and controlling the stirring speed to be from slow to fast, when the expanded graphite-polyethylene glycol composite material is completely added, rotating at a constant speed for 0.5h, and stirring at 1500 rpm so that the emulsified asphalt can fully wrap the composite material, thereby preparing the polyethylene glycol phase-change energy storage material, wherein the total mass fraction of the emulsified asphalt and the polyethylene glycol phase-change energy storage material is 80%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. Novel road surface structure of city heavy traffic, its characterized in that: the pavement structure comprises a surface layer, a middle layer, a lower layer, a base layer and a subbase layer from top to bottom, wherein a rubber asphalt stress absorption layer is arranged between the lower layer and the base layer, and the surface layer is formed by 4-6 cm layers of semi-flexible material SFA13 sprayed with dew stone agents; the middle surface layer is composed of 6-8 cm of semi-flexible material SFA16 layer doped with phase change energy storage material; the lower surface layer is composed of an EME20 high-modulus asphalt mixed material layer of RAP with the high proportion of 8-10 cm, the base layer is composed of a C-B-1 cement stable graded broken stone or gravel layer doped with bagasse fiber, waste rubber powder and water-absorbent resin polyacrylate sodium salt, and the base layer is composed of an assembled regular hexagonal prism-shaped porous cement concrete layer with the length of 15-18 cm.
2. The novel pavement structure of urban heavy-duty traffic according to claim 1, characterized in that: a first adhesive layer is arranged between the surface layer and the middle layer, a second adhesive layer is arranged between the middle layer and the lower layer, and the first adhesive layer and the second adhesive layerThe SBS modified asphalt binder layer or the modified emulsified asphalt binder layer has a unit area spreading amount of 0.7-0.8 kg/m2。
3. The novel pavement structure of urban heavy-duty traffic according to claim 1, characterized in that: the thickness of the rubber asphalt stress absorbing layer is 0.8 cm-1.3 cm.
4. The novel pavement structure of urban heavy-duty traffic according to claim 1, characterized in that: gaps along the bottom direction are arranged on the lower half portion of the bottom base layer, the distance between every two adjacent gaps is 0.6-1.5 m, and the width of each gap is 0.5-2 cm.
5. The novel pavement structure of urban heavy-duty traffic according to claim 1, characterized in that: the semi-flexible material SFA13 layer is formed by mutually pouring and bonding rubber asphalt with the porosity of 20-28% and mixture pouring cement grouting material.
6. The novel pavement structure of urban heavy-duty traffic according to claim 1, characterized in that: the semi-flexible material SFA16 layer of the phase change energy storage material is formed by mutually pouring and bonding a rubber asphalt mixture with the porosity of 20-28% and a cement grouting material containing the phase change energy storage material.
7. The novel pavement structure of urban heavy-duty traffic according to claim 1 or 6, characterized in that: and an emulsified asphalt layer is wrapped outside the semi-flexible material SFA16 layer of the phase change energy storage material.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111118999A (en) * | 2020-01-17 | 2020-05-08 | 广西交通科学研究院有限公司 | Road structure of urban intersection, bus station and bus lane |
| CN113186772A (en) * | 2021-03-08 | 2021-07-30 | 武汉理工大学 | Light heat-insulating semi-flexible anti-crack pavement and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111118999A (en) * | 2020-01-17 | 2020-05-08 | 广西交通科学研究院有限公司 | Road structure of urban intersection, bus station and bus lane |
| CN113186772A (en) * | 2021-03-08 | 2021-07-30 | 武汉理工大学 | Light heat-insulating semi-flexible anti-crack pavement and preparation method thereof |
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