CN220503589U - Industrial solid waste phosphogypsum composite pavement structure - Google Patents
Industrial solid waste phosphogypsum composite pavement structure Download PDFInfo
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- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 137
- 239000002131 composite material Substances 0.000 title claims abstract description 87
- 239000002910 solid waste Substances 0.000 title claims abstract description 17
- 239000010410 layer Substances 0.000 claims abstract description 131
- 239000011384 asphalt concrete Substances 0.000 claims abstract description 23
- 239000002344 surface layer Substances 0.000 claims abstract description 19
- 239000002689 soil Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 21
- 239000010426 asphalt Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 2
- 239000004575 stone Substances 0.000 description 30
- 239000004568 cement Substances 0.000 description 22
- 239000003795 chemical substances by application Substances 0.000 description 21
- 239000002893 slag Substances 0.000 description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 239000006087 Silane Coupling Agent Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 235000019832 sodium triphosphate Nutrition 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000004567 concrete Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 3
- 239000004746 geotextile Substances 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 102100040428 Chitobiosyldiphosphodolichol beta-mannosyltransferase Human genes 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model discloses an industrial solid waste phosphogypsum composite pavement structure which sequentially comprises a drainage cushion layer, a phosphogypsum composite stable subbase layer, a phosphogypsum composite stable lower base layer, a phosphogypsum composite stable upper base layer, a waterproof sealing layer and an asphalt concrete surface layer from bottom to top, wherein the drainage cushion layer is paved on a soil roadbed. According to the industrial solid waste phosphogypsum composite pavement structure, according to the structural key points of each layer of pavement, the strength requirements and the service performances of different structural layers in a pavement environment are fully considered, and the phosphogypsum is reasonably consumed on the premise of ensuring the pavement performances by gradually increasing the doping amount of the phosphogypsum from top to bottom, so that the situation that the existing phosphogypsum is difficult to recycle is relieved.
Description
Technical Field
The utility model relates to the technical field of pavement structures, in particular to an industrial solid waste phosphogypsum composite pavement structure.
Background
Phosphogypsum is a main byproduct for preparing a phosphate fertilizer, and the main component of phosphogypsum is calcium sulfate dihydrate (CaSO 4 ·2H 2 O), the content of which is 70-90%, and other impurities such as residual phosphide, fluoride, acid insoluble substances, organic matters and the like. In the process for preparing the phosphorus fertilizer, 5 tons of phosphogypsum is generated every 1 ton of phosphorus fertilizer on average. Phosphogypsum is difficult to recycle due to impurities such as fluoride and organic matters, and the effective utilization rate is difficult to reach 50%. A large amount of phosphogypsum is piled up in outdoor sites, severely damaging the environment and wasting land resources, which makes large-scale consumption of phosphogypsum and ensuring of environmental stability thereof important for related researches.
The recycling of phosphogypsum mainly relates to building gypsum boards, cement retarders and the preparation of cementing materials. In road engineering, phosphogypsum is less in application and the technology is still immature, and especially in a composite pavement system containing a large amount of phosphogypsum, the unreasonable amount of phosphogypsum is designed to cause insufficient durability and low strength of the whole pavement structure, so that the actual road effect is influenced. The high mixing amount of phosphogypsum needs to be considered that the strength of the mixture is lower as the aggregate compared with natural stone. In the prior art, service requirements on the actual structural design of the pavement are not considered, and it is difficult to ensure that the addition of phosphogypsum does not influence the actual pavement performance. And the pavement performance requirements corresponding to different structural layers of the pavement are different, the pavement properties of the composite structural layer are mainly considered when phosphogypsum is applied to the pavement structural layers in a large amount, and the design doping amount of phosphogypsum is optimized according to the strength requirements of the different structural layers.
Therefore, it is necessary to design an industrial solid waste phosphogypsum composite pavement structure, which not only consumes a great amount of phosphogypsum, but also ensures that the structural strength meets the road use requirement, and overcomes the environmental protection problem and the recycling problem of phosphogypsum in the application of the road engineering field from the aspect of the overall structural design.
Disclosure of Invention
The utility model aims to solve the problems that the prior phosphogypsum is insufficient in recycling utilization and difficult to scale and promote in environmental protection in the field of road engineering, and provides an industrial solid waste phosphogypsum composite pavement structure.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
an industrial solid waste phosphogypsum composite pavement structure sequentially comprises a drainage cushion layer, a phosphogypsum composite stable subbase layer, a phosphogypsum composite stable lower base layer, a phosphogypsum composite stable upper base layer, a waterproof layer and an asphalt concrete surface layer from bottom to top, wherein the drainage cushion layer is paved on a soil roadbed.
Wherein the thickness of the drainage cushion layer is 15-25cm; the thickness of the phosphogypsum composite stable subbase layer is 15-25cm; the thickness of the phosphogypsum composite stable lower base layer is 15-25cm; the thickness of the phosphogypsum composite stable upper base layer is 15-25cm; the thickness of the waterproof layer is 0.5-1.2cm; the thickness of the asphalt concrete surface layer is 10-18 cm.
The utility model provides an industrial solid waste phosphogypsum composite pavement structure which sequentially comprises a drainage cushion layer, a phosphogypsum composite stable subbase layer, a phosphogypsum composite stable lower base layer, a phosphogypsum composite stable upper base layer, a waterproof layer and an asphalt concrete surface layer from bottom to top. Because phosphogypsum can dissolve out soluble phosphide, fluoride, heavy metal and other substances when meeting water, the composite structure mainly adopts slag-cement-phosphogypsum as a composite cementing material, and the phosphogypsum is wrapped in an omnibearing way through hydration, so that escape of pollution factors is prevented. Under the basis that slag and cement are used as cementing materials and phosphogypsum is used as cementing materials and replaces part of aggregate, a proper amount of alkaline curing agent is introduced, one part of the alkaline curing agent is used for adjusting the acidity of phosphogypsum to build an alkaline environment suitable for reaction, and the other part of the alkaline curing agent is used for promoting the reaction of phosphogypsum and the cementing materials, so that the strength and the stability of the composite material are obviously enhanced. Meanwhile, according to the structural key points of each layer of the pavement, different phosphogypsum doping amounts are adopted for each layer. According to the highway asphalt pavement design specification, the pavement base layer 7d of the highway has no lateral compressive strength of 4-6 MPa and the subbase layer has 2.5-3.5 MPa under the heavy traffic grade. Because the increase of the phosphogypsum doping amount can lead to the decrease of the strength of the mixture, the doping amount of the phosphogypsum of the subbase layer on the composite structure can be properly increased, and then the phosphogypsum of the subbase layer on the composite structure is the lower base layer, and the doping amount of the upper base layer is correspondingly decreased.
Preferably, the drainage mat is made of loose-grain water-permeable materials.
Preferably, the phosphogypsum composite stable base layer is a highway phosphogypsum composite stable base layer material, and is prepared from slag, cement, crushed stone aggregate, an alkaline curing agent and a mixture of phosphogypsum. Wherein, the cement addition amount in the phosphogypsum composite stable subbase layer is 2wt%, the slag addition amount is 8wt%, and the proportion of phosphogypsum to broken stone aggregate is 2:1, the mixing amount of phosphogypsum reaches 60 percent, and the mixing amount of the alkaline curing agent accounts for 1.5 percent of the total amount of slag, cement, broken stone aggregate and phosphogypsum.
Preferably, the phosphogypsum composite stable lower base layer is a highway phosphogypsum composite stable base layer material, and is prepared by adopting a mixture of slag, cement, crushed stone aggregate, an alkaline curing agent and phosphogypsum. Wherein, the cement addition amount in the phosphogypsum composite stable base layer is 1wt%, the slag addition amount is 4wt%, and the proportion of phosphogypsum to crushed stone aggregate is 3: and 7, the mixing amount of the phosphogypsum reaches 28.5%, and the mixing amount of the alkaline curing agent accounts for 1.0% of the total amount of slag, cement, broken stone aggregate and phosphogypsum.
Preferably, the phosphogypsum composite stable upper base layer is a highway phosphogypsum composite stable base layer material, and is prepared by adopting a mixture of slag, cement, crushed stone aggregate, an alkaline curing agent and phosphogypsum. Wherein, the cement addition amount in the phosphogypsum composite stable base layer is 1wt%, the slag addition amount is 4wt%, and the proportion of phosphogypsum to crushed stone aggregate is 3:17, the mixing amount of the phosphogypsum reaches 14.25%, and the mixing amount of the alkaline curing agent accounts for 0.5% of the total amount of slag, cement, broken stone aggregate and phosphogypsum.
Preferably, the surface layer is an asphalt concrete surface layer, wherein the upper surface layer is 3-4cm thick AC-13C fine-grained asphalt concrete, and the asphalt is SBS modified asphalt; the middle surface layer is AC-20C middle particle asphalt concrete with the thickness of 5-6cm and is SBS modified asphalt; the lower layer is AC-25C coarse-grained asphalt concrete with the thickness of 2-8cm, and is 70# common asphalt.
Preferably, the doping amount benefit of the phosphogypsum composite stable material system alkaline curing agent is controlled to be 0.5% -1.5%. The benefit is that: phosphogypsum-slag-cement composite cementing material system needs proper curing agent to excite the activity of the composite cementing material, so that the road strength of the composite structure can be ensured. In addition, the excessive curing agent does not obviously improve the strength of the composite structure, but increases the economic cost of the composite system, and causes waste of materials.
Preferably, geotextile is arranged between the drainage cushion layer and the soil subgrade so as to prevent the subgrade soil from being extruded into the cushion layer to influence the working performance of the subgrade soil.
Preferably, the thickness of the waterproof layer is 1cm, the waterproof layer is a hot asphalt synchronous crushed stone sealing layer, and the grain size of the stone is 9.5-13.2 mm.
In summary, the beneficial effects of the utility model are as follows:
1. the subbase layer, the lower base layer and the upper base layer of the pavement structure are slag cement phosphogypsum composite systems, and are structurally integrated, so that the pavement structure is convenient for practical industrialized application.
2. The pavement structure fully considers the strength requirements of different structural layers in the road environment, ensures the road performance on the premise of reasonably consuming phosphogypsum by gradually increasing the doping amount of phosphogypsum from top to bottom, and effectively relieves the situation of difficult recycling of the existing phosphogypsum.
3. Under the action of phosphogypsum-slag-cement composite gelation, the harmful components of phosphogypsum are wrapped through hydration reaction, so that the environmental safety of the road use process is ensured, and particularly, the overflow of soluble harmful substances such as phosphorus and fluorine can be effectively prevented in a wet environment with high rain wash or ground water level. In addition, the additionally arranged drainage cushion layer between the soil subgrade and the base layer and the waterproof layer between the base layer and the surface layer can effectively inhibit the penetration and aggregation of external moisture, and double protection is provided for the overflow of harmful substances structurally.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Icon: 1-a drainage mat layer; 2-phosphogypsum composite stable subbase layer; 3-phosphogypsum composite stable lower base layer; 4-phosphogypsum composite stable upper base layer; 5-a waterproof seal layer; 6-asphalt concrete surface layer.
Detailed Description
The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present utility model, are within the scope of the present utility model.
Example 1
As shown in fig. 1, the industrial solid waste phosphogypsum composite pavement structure of a highway is a layered composite structure, and sequentially comprises a drainage cushion layer 1, a phosphogypsum composite stable subbase layer 2, a phosphogypsum composite stable lower base layer 3, a phosphogypsum composite stable upper base layer 4, a waterproof layer 5 and an asphalt concrete surface layer 6 from bottom to top, geotextile is paved on a soil subgrade, and the drainage cushion layer is paved on the geotextile.
Wherein the thickness of the drainage mat layer 1 is 20cm; the thickness of the phosphogypsum composite stable subbase layer 2 is 20cm; the thickness of the phosphogypsum composite stable lower base layer 3 is 18cm; the thickness of the phosphogypsum composite stable upper base layer 4 is 18cm; the thickness of the waterproof layer 5 is 1cm; the thickness of the asphalt concrete facing 6 is 18cm.
The preparation process comprises the following steps:
(1) Drainage mat 1
The drainage cushion layer 1 adopts graded broken stone, the used materials are mainly natural broken stone, the shape of the material is close to that of a cube, the particle size is 0.5-5 cm, the content of 2.5-4 cm is 57%, and the crushing value is 19%.
(2) Phosphogypsum composite stable subbase layer 2
The slag cement phosphogypsum subbase 2 selects 4.75-9.5mm broken stone aggregate and phosphogypsum aged for 12 months and crushed to below 2.36mm by a crusher, and the normal water content is 15%. Wherein the SO of phosphogypsum 3 And CaO (expressed by oxide) with a mass fraction of 85%, a liquid limit of 60%, a plastic limit of 40% and a plastic index of 20%, wherein phosphogypsum belongs to high liquid limit powder soil according to the Highway geotechnical test procedure. Meanwhile, the standard moisture absorption and water content of the original phosphogypsum is 1.0%, the free expansion rate is 40%, and the plasticity index is 20%, and the phosphogypsum belongs to weak expansion soil. The slag is granulated blast furnace slag, the grade is S95 grade, and the cement is P.O42.5 ordinary Portland cement. The optimal water content and the maximum dry density of the composite material are determined through a compaction test, the optimal water content is measured to be 12.36 percent, and the maximum dry density is measured to be 1.764g/cm 3 The final proportion is set as slag: and (3) cement: phosphogypsum: 4.75-9.5mm crushed stone aggregate = 8:2:60:30, the mixing amount of the alkaline curing agent is 1.5 percent of the total amount of slag, cement, broken stone aggregate and phosphogypsum. The main components of the alkaline curing agent are NaOH, a silane coupling agent, sodium tripolyphosphate and water, wherein the mass ratio of the NaOH to the silane coupling agent to the sodium tripolyphosphate to the water is 8:1:1:40. the actual measurement 7d of unconfined compressive strength is 3.0MPa, and meets the requirement of the standard of the technical rules for the construction of highway pavement base layers on highways.
(3) Phosphogypsum composite stable lower base layer 3
The phosphogypsum composite stable lower base layer 3 is selected from 0-4.75mm, 4.75-9.5mm, 9.5-19mm, 19-31.5mm crushed stone aggregate and phosphogypsum aged for 12 months and crushed to below 2.36mm by a crusher, and has the same characteristics as the base layer. The concrete grading is designed according to the compact framework, and the proportion of the concrete grading is S95-grade slag: p.o42.5 ordinary Portland cement: phosphogypsum: 0-4.75mm crushed stone aggregate: 4.75-9.5mm crushed stone aggregate: 9.5-19mm crushed stone aggregate: 19-31.5mm crushed stone aggregate = 4:1:28.5:10:13.5:18.5:24.5, the mixing amount of the alkaline curing agent accounts for 1.0% of the total amount of slag, cement, broken stone aggregate and phosphogypsum, the main components of the alkaline curing agent are NaOH, silane coupling agent, sodium tripolyphosphate and water, and the mass ratio of the NaOH, the silane coupling agent, the sodium tripolyphosphate and the water is 8:1:1:40. the measured 7d unconfined compressive strength is 5.3MPa, and meets the requirement of the standard of the Highway pavement basic layer construction technical rule on the expressway.
(4) Phosphogypsum composite stable upper base layer 4
The phosphogypsum composite stable upper base layer 4 is selected from 0-4.75mm, 4.75-9.5mm, 9.5-19mm, 19-31.5mm crushed stone aggregate and phosphogypsum aged for 12 months and crushed to below 2.36mm by a crusher, and has the same characteristics as the subbase layer. The concrete grading is designed according to the compact framework, and the proportion of the concrete grading is S95-grade slag: p.o42.5 ordinary Portland cement: phosphogypsum: 0-4.75mm crushed stone aggregate: 4.75-9.5mm crushed stone aggregate: 9.5-19mm crushed stone aggregate: 19-31.5mm crushed stone aggregate = 4:1:14.25:9.5:19:23.75:28.5, the mixing amount of the alkaline curing agent accounts for 0.5% of the total amount of slag, cement, broken stone aggregate and phosphogypsum, the main components of the alkaline curing agent are NaOH, silane coupling agent, sodium tripolyphosphate and water, and the mass ratio of the NaOH, the silane coupling agent, the sodium tripolyphosphate and the water is 8:1:1:40. the actual measurement 7d of the unconfined compressive strength is 7.2MPa, and meets the requirement of the standard of the technical rules for the construction of highway pavement base layers on highways.
(5) The waterproof layer 5 is a hot asphalt synchronous macadam seal layer
And after the phosphogypsum composite stable base layer is cured, paving a hot asphalt synchronous macadam seal layer, and controlling the thickness to be 1cm. The crushed stone aggregate is controlled to be 9.5-13.2 mm, and the spreading quantity is 9m 3 /1000m 2 The amount of hot asphalt is 1.2kg/m 2 。
(6) Asphalt concrete surface layer
The asphalt concrete pavement is divided into an upper layer, a middle layer and a lower layer, wherein the upper layer is 4cm thick AC-13C fine particle SBS modified asphalt concrete, the middle layer is 6cm thick AC-20C middle particle SBS modified asphalt concrete, the lower layer is 8cm thick AC-25C coarse particle asphalt concrete, the asphalt label is 70#, and the actual measurement performance meets the requirements of Highway asphalt pavement construction technical Specification.
The utility model provides an industrial solid waste phosphogypsum composite pavement structure which mainly comprises six parts, wherein a drainage cushion layer, a phosphogypsum composite stable subbase layer, a phosphogypsum composite stable lower base layer, a phosphogypsum composite stable upper base layer, a waterproof layer and an asphalt concrete surface layer are sequentially arranged from bottom to top. Because phosphogypsum can dissolve soluble phosphide, fluoride, heavy metal and other substances when meeting water, the composite structure mainly adopts phosphogypsum-slag-cement as a composite cementing material, and forms an omnibearing package on phosphogypsum through hydration, thereby preventing pollution factors from escaping. Under the basis that slag and cement are used as cementing materials and phosphogypsum is used as cementing materials and replaces part of aggregate, a proper amount of alkaline curing agent is introduced, one part of the alkaline curing agent is used for adjusting the acidity of phosphogypsum to build an alkaline environment suitable for reaction, and the other part of the alkaline curing agent is used for promoting the reaction of phosphogypsum and the cementing materials, so that the strength and the stability of the composite material are obviously enhanced. Meanwhile, according to the structural key points of each layer of the pavement, different phosphogypsum doping amounts are adopted for different layers. According to the highway asphalt pavement design specification, the pavement base layer 7d of the highway has no lateral compressive strength of 4-6 MPa and the subbase layer has 2.5-3.5 MPa under the heavy traffic grade. Because the strength of the mixture is reduced due to the increase of the phosphogypsum doping amount, the phosphogypsum doping amount of the composite structure is adjusted in a targeted manner, so that the phosphogypsum doping amount is reduced step by step from bottom to top. In addition, the drainage cushion layer between the additionally arranged soil subgrade and the basal layer and the waterproof seal layer between the basal layer and the surface layer can effectively inhibit the penetration and aggregation of external moisture, isolate the contact of phosphogypsum and external moisture, and structurally set double protection for the overflow of harmful substances. The pavement structure ensures the road performance on the premise of rationalizing and consuming a large amount of phosphogypsum, and effectively relieves the situation that the existing phosphogypsum is difficult to recycle.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An industrial solid waste phosphogypsum composite pavement structure, which is characterized in that: the novel high-strength composite-stability drainage device comprises a drainage cushion layer (1), an phosphogypsum composite stable subbase layer (2), an phosphogypsum composite stable lower base layer (3), an phosphogypsum composite stable upper base layer (4), a waterproof layer (5) and an asphalt concrete surface layer (6) from bottom to top, wherein the drainage cushion layer (1) is paved on a soil subgrade;
the phosphogypsum composite stable base layer (2), the phosphogypsum composite stable lower base layer (3) and the phosphogypsum composite stable upper base layer (4) are made of highway phosphogypsum composite stable base materials.
2. The industrial solid waste phosphogypsum composite pavement structure of claim 1, wherein: the thickness of the drainage cushion layer (1) is 15-25cm; the thickness of the phosphogypsum composite stable subbase layer (2) is 15-25cm; the thickness of the phosphogypsum composite stable lower base layer (3) is 15-25cm; the thickness of the phosphogypsum composite stable upper base layer (4) is 15-25cm; the thickness of the waterproof layer (5) is 0.5-1.2cm; the thickness of the asphalt concrete surface layer (6) is 10-18 cm.
3. The industrial solid waste phosphogypsum composite pavement structure of claim 1, wherein: the drainage cushion layer (1) is made of loose particle water permeable materials.
4. The industrial solid waste phosphogypsum composite pavement structure of claim 1, wherein: the waterproof layer (5) is a hot asphalt synchronous macadam seal layer.
5. The industrial solid waste phosphogypsum composite pavement structure of claim 2, which is characterized in that: the asphalt concrete surface layer (6) is divided into an upper layer, a middle surface layer and a lower layer, wherein the upper layer is AC-13C fine-grained asphalt concrete with the thickness of 3-4cm, and asphalt is SBS modified asphalt; the middle surface layer is AC-20C middle particle asphalt concrete with the thickness of 5-6cm, and the asphalt is SBS modified asphalt; the lower layer is AC-25C coarse-grained asphalt concrete with the thickness of 2-8cm, and the asphalt number is 70#.
6. The industrial solid waste phosphogypsum composite pavement structure of claim 1, wherein: geotechnical cloth is arranged between the drainage cushion layer and the soil roadbed.
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| CN202320729095.5U CN220503589U (en) | 2023-04-06 | 2023-04-06 | Industrial solid waste phosphogypsum composite pavement structure |
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| CN202320729095.5U CN220503589U (en) | 2023-04-06 | 2023-04-06 | Industrial solid waste phosphogypsum composite pavement structure |
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