CN216074571U - Novel steel slag asphalt pavement structure - Google Patents
Novel steel slag asphalt pavement structure Download PDFInfo
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- CN216074571U CN216074571U CN202121771662.0U CN202121771662U CN216074571U CN 216074571 U CN216074571 U CN 216074571U CN 202121771662 U CN202121771662 U CN 202121771662U CN 216074571 U CN216074571 U CN 216074571U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a novel steel slag asphalt pavement structure which sequentially comprises a surface layer and a base layer from top to bottom, wherein a sealing layer is further arranged between the surface layer and the base layer, the surface layer is an asphalt mixture layer, the asphalt mixture layer sequentially comprises an upper asphalt mixture, a middle asphalt mixture and a lower asphalt mixture from top to bottom, the base layer sequentially comprises a graded gravel layer and a cement stabilizing gravel layer from top to bottom, steel slag aggregates are doped in the aggregates of the surface layer and the base layer, and the surface layer and the base layer are steel slag mixture layers. The utility model starts from the functions of all layers of the asphalt pavement, fully utilizes the characteristics of the steel slag aggregates with different grain diameters, consumes the steel slag solid waste on a large scale, improves the durability of the pavement, prolongs the service life of the pavement and reduces the engineering cost.
Description
Technical Field
The utility model belongs to the field of road engineering, and particularly relates to a novel steel slag asphalt pavement structure.
Background
The steel slag is discharged from steel making, accounts for about 10-15% of the yield of crude steel, and belongs to a large industrial solid waste. The main mineral phases of the steel slag are tricalcium silicate, dicalcium silicate, calcium forsterite, calcium magnesium multiflower hectorite, calcium aluminoferrite, solid solution formed by oxides of silicon, magnesium, iron, manganese and phosphorus, and a small amount of free calcium oxide, metallic iron, fluorapatite and the like. At present, the main way of steel slag absorption is to directly add the steel slag into a blast furnace or sinter as an iron-making flux, but the utilization rate of blast furnace iron-making can be directly reduced by taking the steel slag with higher contents of sulfur and phosphorus as the flux. In order to actively practice the development idea that green traffic and green water mountain are the Jinshan Yinshan, the aged steel slag is used as a road material, is widely applied to a cushion layer and a structural layer of a road subgrade, and is particularly suitable to be used as an aggregate paving pavement of an asphalt mixture. The steel slag road has the advantages of high strength, good wear resistance and skid resistance, good durability, low maintenance cost and the like.
The steel slag is applied to the field of road engineering and mainly replaces ore aggregates with the steel slag aggregates, such as a steel slag upper surface layer SMA material (patent number 201911012831.X), a steel slag bonding layer material (patent number 201911235856.6), a steel slag pervious concrete material (patent number 201910940997.1, patent number 201911359583.6), a steel slag recycled asphalt mixture (patent number 201711349397.5) and the like. Because the grain sizes of the steel slag are different and the difference of the physical and mechanical properties of the steel slag with different grain sizes is obvious, the utilization of the steel slag at present mainly replaces ore coarse and fine aggregates, ore fillers and the like according to the grain sizes, the idea of utilizing the bagasse is to determine the utilization occasion according to the grain sizes, but the grain sizes of the steel slag and the difference of the physical and mechanical properties cannot be combined. For example, in road engineering, the physical and mechanical properties of coarse aggregates in the asphalt mixture of the upper layer, coarse aggregates in the asphalt mixture of other surface layers, coarse aggregates in the cement-stabilized macadam of the base layer and coarse aggregates in the graded macadam of the subbase layer are greatly different, the price of the coarse aggregates is different, and the embarrassing situation that many high-quality steel slags can be used in a low-value mode and some low-quality steel slags cannot meet technical requirements and cannot be used according to the current thinking of replacing ore coarse aggregates with rough-cut steel slags is caused, so that the resource utilization of industrial solid waste steel slags is seriously hindered. Therefore, the utility model provides a novel steel slag asphalt pavement structure which combines the grain size of steel slag and the differentiation of physical and mechanical properties according to the difference of the functions and effects of different layers of the pavement structure and the difference of the layers of the pavement structure on the composition, technical indexes and mechanical properties of materials.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model aims to provide a novel steel slag asphalt pavement structure, which combines the grain size of steel slag and the differentiation of physical and mechanical properties, avoids the problems that high-quality steel slag can be used in a low-value mode and some low-quality steel slag cannot be used due to the fact that the low-quality steel slag cannot meet the technical requirements, can realize full-granularity fine utilization of the steel slag, can consume steel slag solid wastes in a large scale, improves the pavement durability, prolongs the service life of a pavement, and reduces the engineering cost.
In order to achieve the purpose, the utility model provides the following technical scheme:
the utility model provides a novel slag bituminous paving structure, the pavement structure is from last to including surface course and basic unit down in proper order, still be provided with the seal between surface course and the basic unit, the surface course is the bituminous mixture bed, the bituminous mixture bed includes upper strata bituminous mixture, well surface course bituminous mixture, lower surface course bituminous mixture from last to down in proper order, the basic unit is from last to including grading metalling and cement stabilization metalling down in proper order, all be doped with the slag in the aggregate of surface course and basic unit and gather materials, this surface course and basic unit are the slag mixture bed.
And a waterproof layer is arranged between the lower surface layer asphalt mixture and the seal layer.
Further, a cushion layer is arranged below the cement stabilizing gravel layer, and a bonding layer is further paved between the cement stabilizing gravel layer and the cushion layer.
Furthermore, the grain size of the steel slag aggregate in the asphalt mixture of the upper layer is less than 4.75mm, and the thickness of the layer is 4-6 cm.
Furthermore, the grain size of the steel slag aggregate in the middle-surface-layer asphalt mixture is less than 9.5mm, and the thickness of the layer is 6-8 cm.
Furthermore, the grain size of the steel slag aggregate in the asphalt mixture of the lower surface layer is less than 9.5mm, and the thickness of the layer is 8-10 cm.
Furthermore, the aggregate of the sealing layer is any one of neutral aggregate and neutral alkaline-biased aggregate, the particle size specification of the aggregate is 9.5-16mm, and the thickness of the layer is 4-7 mm.
Furthermore, G-A-4 graded broken stones are adopted in the graded broken stone layer, the grain size of the steel slag aggregate is less than 19mm, and the thickness of the layer is 18-26 cm.
Further, the cement stabilized macadam layer adopts C-B-1 macadam grading, the grain size of the steel slag aggregate is less than 13.2mm, and the thickness of the layer is 18-36 cm.
The utility model has the beneficial effects that:
1. the utility model matches the difference of the grain size and the physical mechanical property of the steel slag with the functions and the effects of different positions of a pavement structure, thereby realizing the high-valued and efficient utilization of the full granularity of the steel slag;
2. the utility model matches the difference of the mixing amount of the steel slag aggregate with the functions and the effects of different positions of the pavement structure, and realizes high unification of the utilization of industrial solid wastes, the pavement performance of the pavement material and the durability of the pavement material;
3. the utility model adopts the inverted pavement structure formed by the graded gravel layer between the flexible lower surface layer asphalt mixture and the semi-rigid cement stable gravel layer, can avoid or relieve the expansion deformation of high-doped steel slag and large-particle-size steel slag, consumes steel slag aggregates with lower technical indexes, realizes the high coordination of the doping amount, particle size and technical characteristics of the steel slag aggregates and the pavement structure layer, and reduces the engineering construction cost;
4. the middle-surface asphalt mixture adopts the high-modulus asphalt mixture, exerts the advantages of high modulus and high strength of the steel slag aggregate, further ensures the high-temperature stability of the pavement and prolongs the service life of the pavement.
5. According to the steel slag asphalt pavement structure obtained by implementing the method, the dynamic stability, the CBR value and the unconfined compressive strength are higher than those of the asphalt pavement structure in the comparative example, and after the steel slag aggregate replaces the traditional ore aggregate, the mechanical properties of the material are equivalent and the standard requirements are completely met.
6. According to the utility model, the waterproof layer is arranged between the surface layer and the sealing layer, and the waterproof layer and the sealing layer have double functions, so that water in the asphalt mixture layer is further prevented from entering the base layer, the roadbed is damaged, the service life of the highway is reduced, and meanwhile, the bonding layer is arranged between the cushion layer and the cement stabilized gravel layer, so that the stability of the pavement structure is further improved.
Drawings
FIG. 1 is a schematic view of the pavement structure of the present invention.
The asphalt-cement composite material comprises, by weight, 1-an upper asphalt mixture layer, 2-a middle asphalt mixture layer, 3-a lower asphalt mixture layer, 4-a sealing layer, 5-a graded gravel layer, 6-a cement-stabilized gravel layer, a waterproof layer-7, a cushion layer-8 and a bonding layer-9.
Detailed Description
For a better understanding of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
The utility model provides a novel slag bituminous paving structure, the pavement structure is from last to including surface course and basic unit down in proper order, still be provided with the seal between surface course and the basic unit, the surface course is the bituminous mixture bed, the bituminous mixture bed includes upper strata bituminous mixture, well surface course bituminous mixture, following layer bituminous mixture from last to down in proper order, the basic unit is from last to including grading metalling and cement stabilization metalling down in proper order, all be doped with slag in the aggregate of surface course and basic unit and gather materials, this surface course and basic unit are the slag mixture bed, and free calcium oxide in this slag gathers materials is less than or equal to 3.0%, and magnetic metal iron is less than or equal to 2.0%, wherein: the mixing amount of the steel slag aggregate in the asphalt mixture layer is 20-70 percent, and the water-soaking expansion of the steel slag aggregate is less than or equal to 2.0 percent; the steel slag aggregate content in the graded crushed stone layer is 70-90%, and the water-soaking expansion of the steel slag aggregate is less than or equal to 4.0%; the mixing amount of the steel slag aggregate in the cement stabilized rubble layer is 60-80%, and the water-soaking expansion of the steel slag aggregate is less than or equal to 3.0%.
Be provided with the waterproof layer between lower surface course bituminous mixture and the seal, this waterproof layer is waterproofing membrane, and waterproofing membrane can be any kind in elastomer modified asphalt waterproofing membrane (SBS coiled material), plastomer modified asphalt waterproofing membrane (APP coiled material), and the thickness of this waterproof layer is 2-3 mm.
And a cushion layer is also arranged below the cement stable gravel layer, is a graded gravel layer and has the thickness of 15-20 cm. Still laid the tie coat between rubble layer and the bed course is stabilized to cement, and this tie coat is modified emulsified asphalt layer, and thickness is about 2-3mm, and the setting of tie coat has improved the stability of bonding between rubble layer and the bed course is stabilized to cement, has further improved the stability of road surface structure.
The asphalt mixture layer also comprises natural aggregate, mineral powder and a binding material, wherein the binding material is any one of SBS modified asphalt and matrix asphalt.
The asphalt mixture layer comprises an upper asphalt mixture layer, a middle asphalt mixture layer and a lower asphalt mixture layer from top to bottom in sequence, wherein:
the upper asphalt mixture is formed by mixing and paving the following raw materials in a mass ratio: mineral powder: fiber: bonding material 100: (8-12): (0.2-0.5): (5.5-6.8), the natural aggregate is 70-80%, the steel slag aggregate is 20-30%, the crushing value of the steel slag aggregate is less than or equal to 26%, the loss of los angeles due to abrasion is less than or equal to 28%, the water absorption rate is less than or equal to 2.0%, the firmness is less than or equal to 12%, the grinding value is less than or equal to 42%, the methylene blue value is less than or equal to 25g/kg, and the particle size of the steel slag aggregate is less than 4.75 mm;
the medium-surface layer asphalt mixture is prepared by mixing and paving the following raw materials in a mass ratio: mineral powder: bonding material 100: (4-8): (5.0-6.5), the natural aggregate is added in an amount of 40-60%, the steel slag aggregate is added in an amount of 40-60%, the crushing value of the steel slag aggregate is less than or equal to 28%, the loss of los angeles due to abrasion is less than or equal to 30%, the water absorption rate is less than or equal to 3.0%, the firmness is less than or equal to 12%, the grinding value is less than or equal to 42%, and the particle size of the steel slag aggregate is less than 9.5 mm;
the lower surface layer asphalt mixture is formed by mixing and paving the following raw materials in a mass ratio: mineral powder: bonding material 100: (3-7): (4-5.5), the mixing amount of the natural aggregate is 30-50%, the mixing amount of the steel slag aggregate is 50-70%, the crushing value of the steel slag aggregate is less than or equal to 28%, the shape of a needle sheet is less than or equal to 18%, and the grain size of the steel slag aggregate is less than 9.5 mm.
In the utility model, the thickness of the upper layer asphalt mixture is 4-6cm, the thickness of the middle layer asphalt mixture is 6-8cm, and the thickness of the lower layer asphalt mixture is 8-10 cm; the upper layer asphalt mixture is any one of SMA-13, AC-13 and Superpave-13, and the bonding material is SBS modified asphalt; the middle-surface layer asphalt mixture is HMA-16 high-modulus asphalt mixture, and the bonding material is SBS modified asphalt; the lower layer asphalt mixture is any one of AC-20 asphalt mixtures and AC-25 asphalt mixtures, and the binding material is No. 70 matrix asphalt.
The sealing layer is formed by mixing and paving the following raw materials in a mass ratio: mineral powder: modified emulsified asphalt: water: 100 parts of cement: (5-15): (10-15): (5-10): (1-3), the aggregate is any one of neutral aggregate and neutral alkaline aggregate, the particle size specification of the aggregate is 9.5-16mm, the sealing layer adopts a synchronous broken stone sealing layer, the thickness of the sealing layer is 4-7mm, and the modified emulsified asphalt has good waterproof performance.
The graded broken stone layer comprises broken stones, G-A-4 graded broken stones are adopted, the crushing value of the steel slag aggregate in the graded broken stone layer is not more than 30%, the needle shape is not more than 20%, the grain size of the steel slag aggregate is less than 19mm, and the thickness of the graded broken stone layer is 18-26 cm.
The cement stabilized rubble layer is formed by mixing and paving the following raw materials in mass ratio: ordinary portland cement 100: (5-7), the thickness of the cement-stabilized rubble layer is 18-36cm, the C-B-1 rubble gradation is adopted, the crushing value of the steel slag aggregate in the cement-stabilized rubble layer is not more than 30%, the needle shape is not more than 22%, and the particle size of the steel slag aggregate is less than 13.2 mm.
In the utility model, the cement is ordinary portland cement, the fiber is wood fiber, and the aggregate, the mineral powder, the modified emulsified asphalt and the SBS modified asphalt are all the existing materials available in the market.
Example 1
The pavement structure in this embodiment includes bituminous mixture upper strata layer 1, bituminous mixture middle surface layer 2, bituminous mixture lower surface layer 3, seal coat 4, graded gravel layer 5, cement stabilized gravel layer 6.
The upper layer 1 of the asphalt mixture adopts SMA-13 asphalt mixture, wherein the aggregate: mineral powder: fiber: bonding material 100: 8: 0.2: 5.5 SBS modified asphalt, 6.3% of oilstone ratio, the fiber is lignin fiber, the steel slag mixing amount is 20%, the steel slag technical indexes are shown in table 1, and the mineral aggregate grading is shown in table 2.
TABLE 1 Steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 1.5％ | Water absorption rate | 1.6％ |
| Free calcium oxide | 2.2％ | Firmness of |
8％ |
| Magnetic metallic iron | 1.5％ | Polishing value | 36％ |
| Crush number | 23％ | Methylene blue value | 20g/kg |
| Los Angeles abrasion loss | 25％ |
TABLE 2 SMA-13 grading
The surface layer 2 of the asphalt mixture adopts HMA-16, wherein the aggregate: mineral powder: bonding material 100: 4: 5.0 SBS modified asphalt, 5.2% of oilstone ratio, 40% of steel slag, the steel slag technical indexes are shown in Table 3, and the mineral aggregate grading is shown in Table 4.
TABLE 3 Steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 1.6％ | Los Angeles abrasion loss | 26％ |
| Free calcium oxide | 2.3％ | Water absorption rate | 2.3％ |
| Magnetic metallic iron | 1.5％ | Firmness of |
9％ |
| Crush number | 25％ | Polishing value | 38％ |
TABLE 4 HMA-16 grading
The lower layer 3 of the asphalt mixture adopts AC-20, wherein, the aggregate: mineral powder: bonding material 100: 3: 4, the binding material is 70# base asphalt, the oil-stone ratio is 4.3%, the steel slag mixing amount is 50%, the steel slag technical indexes are shown in a table 5, and the mineral aggregate gradation is shown in a table 6.
TABLE 5 Steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 1.7％ | Crush number | 25％ |
| Free calcium oxide | 2.7％ | Needle-like content | 12％ |
| Magnetic metallic iron | 1.6％ |
TABLE 6 AC-20 grading
The graded broken stone layer 5 adopts G-A-4 graded broken stones, the steel slag content is 70 percent, the technical indexes of the steel slag are shown in a table 7, and the mineral aggregate grading is shown in a table 8.
TABLE 7 Steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 3.2％ | Crush number | 26％ |
| Free calcium oxide | 2.6％ | Needle-like content | 14％ |
| Magnetic metallic iron | 1.6％ |
TABLE 8 grading of graded crushed stone of G-A-4
The cement stabilized macadam layer 6 adopts the gradation of C-B-1 cement stabilized macadam, and aggregates: ordinary portland cement 100: 5, cement strength grade 42.5, 6.0% cement dosage, 60% steel slag doping, steel slag technical indexes as shown in table 9, and mineral aggregate grading as shown in table 10.
TABLE 9 Steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 2.1％ | Crush number | 25％ |
| Free calcium oxide | 2.6％ | Needle-like content | 14％ |
| Magnetic metallic iron | 1.5％ |
TABLE 10C-B-1 gradation of cement stabilized macadam
Example 2
The pavement structure in this embodiment includes bituminous mixture upper strata layer 1, bituminous mixture middle surface layer 2, bituminous mixture lower surface layer 3, seal coat 4, graded gravel layer 5, cement stabilized gravel layer 6.
The asphalt mixture upper layer 1 adopts an AC-13 asphalt mixture, wherein the aggregate: mineral powder: bonding material 100: 10: 6, the bonding material is SBS modified asphalt, the oil-stone ratio is 4.8%, the steel slag doping amount is 25%, the steel slag technical indexes are shown in a table 11, and the mineral aggregate gradation is shown in a table 12.
TABLE 11 Steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 1.5％ | Water absorption rate | 1.6％ |
| Free calcium oxide | 2.2％ | Firmness of |
8％ |
| Magnetic metallic iron | 1.5％ | Polishing value | 36％ |
| Crush number | 23％ | Methylene blue value | 20g/kg |
| Los Angeles abrasion loss | 25％ |
TABLE 12 AC-13 grading
The surface layer 2 of the asphalt mixture adopts HMA-16, wherein the aggregate: mineral powder: bonding material 100: 6: 6, the bonding material is SBS modified asphalt, the oil-stone ratio is 5.2%, the steel slag mixing amount is 50%, the steel slag technical indexes are shown in a table 13, and the mineral aggregate gradation is shown in a table 14.
TABLE 13 Steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 1.6％ | Los Angeles abrasion loss | 26％ |
| Free calcium oxide | 2.3％ | Water absorption rate | 2.3％ |
| Magnetic metallic iron | 1.5％ | Firmness of |
9％ |
| Crush number | 25％ | Polishing value | 38％ |
TABLE 14 HMA-16 grading
The lower layer 3 of the asphalt mixture adopts AC-25, wherein, the aggregate: mineral powder: bonding material 100: 5: 5, the binding material is 70# base asphalt, the oil-stone ratio is 4.2%, the steel slag doping amount is 61%, the steel slag technical indexes are shown in a table 15, and the mineral aggregate grading is shown in a table 16.
TABLE 15 technical indices of steel slag
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 1.7％ | Crush number | 24％ |
| Free calcium oxide | 2.6％ | Needle-like content | 12％ |
| Magnetic metallic iron | 1.6％ |
TABLE 16AC-25 grading
The graded crushed stone layer 5 adopts G-A-4 graded crushed stone, the steel slag content is 78 percent, the technical indexes of the steel slag are shown in a table 17, and the mineral aggregate grading is shown in a table 18.
TABLE 17 Steel slag technical indexes
TABLE 18G-A-4 grading of graded macadam
The cement stabilized macadam layer 6 adopts the grading of C-B-1 cement stabilized macadam, wherein the aggregate: ordinary portland cement 100: 6, cement strength grade 42.5, 5.7% cement dosage, steel slag doping amount 70%, steel slag technical indexes as shown in table 19, and mineral aggregate grading as shown in table 20.
Table 19 steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 2.2％ | Crush number | 25％ |
| Free calcium oxide | 2.6％ | Needle-like content | 14％ |
| Magnetic metallic iron | 1.5％ |
TABLE 20C-B-1 gradation of cement stabilized macadam
Example 3
The pavement structure in this embodiment includes bituminous mixture upper strata layer 1, bituminous mixture middle surface layer 2, bituminous mixture lower surface layer 3, seal coat 4, graded gravel layer 5, cement stabilized gravel layer 6.
The upper layer 1 of the asphalt mixture adopts a Superpave-13 asphalt mixture, wherein the aggregate: mineral powder: bonding material 100: 12: 6.8, the bonding material is SBS modified asphalt, the oil-stone ratio is 6.3 percent, the steel slag mixing amount is 30 percent, the steel slag technical index is shown in table 21, and the mineral aggregate gradation is shown in table 22.
TABLE 21 Steel slag technical indexes
TABLE 22 Superpassive-13 grading
The surface layer 2 in the asphalt mixture adopts HMA-16, aggregate: mineral powder: bonding material 100: 8: 6.5, the bonding material is SBS modified asphalt, the oil-stone ratio is 5.2%, the steel slag mixing amount is 60%, the steel slag technical index is shown in table 23, and the mineral aggregate gradation is shown in table 24.
TABLE 23 Steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 1.6％ | Los Angeles abrasion loss | 26％ |
| Free calcium oxide | 2.3％ | Water absorption rate | 2.3％ |
| Magnetic metallic iron | 1.5％ | Firmness of |
9％ |
| Crush number | 25％ | Polishing value | 38％ |
TABLE 24 HMA-16 grading
The lower layer 3 of the asphalt mixture adopts AC-20, aggregates: mineral powder: bonding material 100: 7: 5.5, the binding material is 70# base asphalt, the oil-stone ratio is 4.3%, the steel slag mixing amount is 70%, the steel slag technical indexes are shown in a table 25, and the mineral aggregate grading is shown in a table 26.
TABLE 25 Steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 1.7％ | Crush number | 25％ |
| Free calcium oxide | 2.7％ | Needle-like content | 12％ |
| Magnetic metallic iron | 1.6％ |
TABLE 26 AC-20 grading
The graded crushed stone layer 5 adopts G-A-4 graded crushed stone, the steel slag content is 90 percent, the technical indexes of the steel slag are shown in a table 27, and the mineral aggregate grading is shown in a table 28.
Table 27 steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 3.2％ | Crush number | 26％ |
| Free calcium oxide | 2.6％ | Needle-like content | 14％ |
| Magnetic metallic iron | 1.6％ |
TABLE 28 grading of graded crushed stone-A-4
The cement stabilized macadam layer 6 adopts the grading of C-B-1 cement stabilized macadam, wherein the aggregate: ordinary portland cement 100: 7, cement strength grade 42.5, cement dosage of 6.0%, steel slag mixing amount 80%, steel slag technical indexes shown in a table 29, and mineral aggregate grading shown in a table 30.
Table 29 steel slag technical indexes
| Technical index | Numerical value | Technical index | Numerical value |
| Swelling rate in water | 2.1％ | Crush number | 25％ |
| Free calcium oxide | 2.6％ | Needle-like content | 14％ |
| Magnetic metallic iron | 1.5％ |
TABLE 30C-B-1 gradation of cement stabilized macadam
Comparative example 1
The upper layer 1 of the asphalt mixture adopts SMA-13 asphalt mixture, SBS modified asphalt, 6.2% of oilstone ratio, 0.3% of lignin fiber and mineral aggregate gradation as shown in Table 31.
TABLE 31 SMA-13 grading
The surface layer 2 of the high modulus asphalt mixture adopts HMA-16 and SBS modified asphalt with the oil-stone ratio of 5.0 percent, and the mineral aggregate gradation is shown in the table 32.
TABLE 32 HMA-16 grading
The lower layer 3 of the asphalt mixture adopts AC-20, 70# base asphalt, the oil-stone ratio is 4.0 percent, and the mineral aggregate gradation is shown in the table 33.
TABLE 33 AC-20 grading
The sealing layer 4 adopts a synchronous broken stone sealing layer, the cementing material can adopt one of road petroleum asphalt, SBS modified and rubber asphalt, and adopts neutral aggregate or neutral alkaline-biased aggregate with single grain diameter, and the aggregate with the grain diameter specification of 9.5-16mm should be clean, dry, weatherless, impurity-free, regular in shape and have enough strength and abrasion resistance.
G-A-4 graded broken stone is adopted as the graded broken stone layer 5, and the mineral aggregate grading is shown in a table 34.
TABLE 34G-A-4 grading of graded crushed stones
The cement stabilized macadam layer 6 adopts the gradation of C-B-1 cement stabilized macadam, the cement strength grade is 42.5, the cement dosage is 6.0 percent, and the mineral aggregate gradation is shown in the table 25.
TABLE 35C-B-1 gradation of cement stabilized macadam
Comparative example 2
The upper layer 1 of the asphalt mixture adopts AC-13 asphalt mixture, SBS modified asphalt, 4.7% of oilstone ratio and mineral aggregate gradation as shown in Table 36.
TABLE 36 AC-13 grading
The surface layer 2 of the high modulus asphalt mixture adopts HMA-16 and SBS modified asphalt with the oil-stone ratio of 5.0 percent, and the mineral aggregate gradation is shown in the table 37.
TABLE 37 HMA-16 grading
The lower layer 3 of the asphalt mixture adopts AC-25, 70# base asphalt, the oil-stone ratio is 4.0 percent, and the mineral aggregate gradation is shown in Table 38.
TABLE 38 AC-25 grading
The sealing layer 4 adopts a synchronous broken stone sealing layer, the cementing material can adopt one of road petroleum asphalt, SBS modified and rubber asphalt, and adopts neutral aggregate or neutral alkaline-biased aggregate with single grain diameter, and the aggregate with the grain diameter specification of 9.5-16mm should be clean, dry, weatherless, impurity-free, regular in shape and have enough strength and abrasion resistance.
The graded crushed stone layer 5 adopts G-A-4 graded crushed stone, and the mineral aggregate grading is shown in Table 39.
TABLE 39G-A-4 grading of graded crushed stones
The cement stabilized macadam layer 6 adopts the grading of C-B-1 cement stabilized macadam, the cement strength grade is 42.5, the cement dosage is 5.7 percent, and the mineral aggregate grading is shown in a table 40.
TABLE 40 gradation of cement stabilized macadam C-B-1
Comparative example 3
The upper layer 1 of the asphalt mixture adopts Superpave-13 asphalt mixture, SBS modified asphalt, 6.3% oilstone ratio, and mineral aggregate gradation as shown in Table 41.
TABLE 41 Superpassive-13 grading
The surface layer 2 of the asphalt mixture adopts HMA-16, SBS modified asphalt, 5.2% of oilstone ratio, and mineral aggregate gradation is shown in Table 42.
TABLE 42 HMA-16 grading
The lower layer 3 of the asphalt mixture adopts AC-20, 70# base asphalt, the oil-stone ratio is 4.3 percent, and the mineral aggregate gradation is shown in Table 43.
TABLE 43 AC-20 grading
The sealing layer 4 adopts a synchronous broken stone sealing layer, the cementing material can adopt one of road petroleum asphalt, SBS modified and rubber asphalt, and adopts neutral aggregate or neutral alkaline-biased aggregate with single grain diameter, the grain diameter specification is 9.5-16mm, the aggregate is clean, dry, weatherless, impurity-free, regular in shape and has enough strength and abrasion resistance.
G-A-4 graded broken stone is adopted as the graded broken stone layer 5, and the mineral aggregate grading is shown in a table 44.
TABLE 44 grading of graded crushed stone
The cement stabilized macadam layer 6 adopts the gradation of C-B-1 cement stabilized macadam, the cement strength grade is 42.5, the cement dosage is 6.0 percent, and the mineral aggregate gradation is shown in a table 45.
TABLE 45 gradation of cement stabilized macadam C-B-1
For the dynamic stability test, the graded crushed stone CBR test and the cement stabilized crushed stone unconfined compressive strength test of the asphalt mixture obtained in the embodiments 1 to 3 and the comparative examples 1 to 3, the dynamic stability test method and the standard refer to road engineering asphalt and asphalt mixture test specification JTG E20-2011, road asphalt pavement construction technical specification JTG F40-2004, the CBR test and the unconfined compressive strength test method and the standard refer to road engineering inorganic binder stabilized material test specification JTG E51-2015 and road pavement construction technical specification JTG/T F20-2015, respectively, and the test results are shown in Table 46.
TABLE 46 comparison of the effects of the examples
As can be seen from Table 46, the dynamic stability, CBR value and unconfined compressive strength of the embodiments of the present invention are all higher than those of the comparative examples, which indicates that the mechanical properties of the materials according to the steel slag doping amount and technical indexes of each layer of the pavement structure of the present invention are all higher than or close to those of the materials without steel slag doping, and all meet the current standard of specification. The grading of the HMA-16 asphalt mixture does not occur in different examples, the asphalt content of the comparative example is slightly higher than that of the examples because the surface texture of the steel slag aggregate is rich and more asphalt is required for replacing the ore aggregate under the same grading condition, but the test result shows that the mechanical property of the material is equivalent after the steel slag aggregate replaces the traditional ore aggregate and the standard requirement is completely met. Meanwhile, after the steel slag aggregate replaces part of ore aggregate, the dosage of the cement in the cement stabilized macadam is also increased in a proper amount. Although the embodiment is slightly higher in the cost of asphalt (cement), the social benefit, the ecological benefit and the economic benefit generated after large-scale application brought by the replacement of the ore aggregate by the steel slag aggregate are obvious, and the benefits obviously exceed the material cost of slightly increased dosage of the asphalt (cement). Therefore, the utility model can absorb the solid waste of the steel slag in a large scale, improve the durability of the pavement, prolong the service life of the pavement and reduce the engineering cost.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (9)
1. The utility model provides a novel slag bituminous paving structure, a serial communication port, the road surface structure is from last to including surface course and basic unit down in proper order, still be provided with the seal between surface course and the basic unit, the surface course is the bituminous mixture layer, the bituminous mixture layer is from last to including upper asphalt mixture, well surface course bituminous mixture down in proper order, lower surface course bituminous mixture down, the basic unit is from last to including grading metalling and cement stabilization metalling down in proper order, all be doped with the slag in the aggregate of surface course and basic unit and gather materials, and this surface course and basic unit are the slag mixture layer.
2. The novel steel slag asphalt pavement structure as claimed in claim 1, wherein a waterproof layer is arranged between the lower asphalt mixture and the seal layer.
3. The novel steel slag asphalt pavement structure as claimed in claim 2, wherein a cushion layer is arranged below the cement stabilized gravel layer, and a bonding layer is further laid between the cement stabilized gravel layer and the cushion layer.
4. The novel steel slag asphalt pavement structure as claimed in claim 1, wherein the steel slag aggregate in the upper asphalt mixture has a particle size of less than 4.75mm and a thickness of 4-6 cm.
5. The novel steel slag asphalt pavement structure as claimed in claim 1, wherein the steel slag aggregate in the middle-layer asphalt mixture has a particle size of less than 9.5mm and a thickness of 6-8 cm.
6. The novel steel slag asphalt pavement structure as claimed in claim 1, wherein the steel slag aggregate in the lower asphalt mixture has a particle size of less than 9.5mm and a thickness of 8-10 cm.
7. The novel steel slag asphalt pavement structure as claimed in claim 1, wherein the aggregate of the sealing layer is any one of neutral aggregate and neutral alkaline-biased aggregate, the aggregate has a particle size specification of 9.5-16mm, and the thickness of the layer is 4-7 mm.
8. The novel steel slag asphalt pavement structure as claimed in claim 1, wherein said graded crushed stone layer is G-A-4 graded crushed stone, the grain size of the steel slag aggregate is less than 19mm, and the thickness of the layer is 18-26 cm.
9. The novel steel slag asphalt pavement structure as claimed in claim 1, wherein the cement stabilized macadam layer is of C-B-1 macadam grading, the particle size of the steel slag aggregate is less than 13.2mm, and the thickness of the layer is 18-36 cm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529528A (en) * | 2021-07-30 | 2021-10-22 | 广西交科集团有限公司 | Full-granularity asphalt pavement structure for finely utilizing steel slag |
| CN115506184A (en) * | 2022-08-19 | 2022-12-23 | 中交一公局集团有限公司 | Inverted combined structure based on cement stabilized macadam subbase and graded macadam base |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529528A (en) * | 2021-07-30 | 2021-10-22 | 广西交科集团有限公司 | Full-granularity asphalt pavement structure for finely utilizing steel slag |
| CN115506184A (en) * | 2022-08-19 | 2022-12-23 | 中交一公局集团有限公司 | Inverted combined structure based on cement stabilized macadam subbase and graded macadam base |
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