CN108951337B - Red mud-based light filler road extension splicing structure and method - Google Patents
Red mud-based light filler road extension splicing structure and method Download PDFInfo
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- CN108951337B CN108951337B CN201811157044.XA CN201811157044A CN108951337B CN 108951337 B CN108951337 B CN 108951337B CN 201811157044 A CN201811157044 A CN 201811157044A CN 108951337 B CN108951337 B CN 108951337B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C1/00—Design or layout of roads, e.g. for noise abatement, for gas absorption
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/003—Foundations for pavings characterised by material or composition used, e.g. waste or recycled material
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a road extension splicing structure and method of a red mud-based light filling material, and belongs to the fields of industrial waste resource utilization and road engineering. The structure comprises an original road structure and splicing steps, and is characterized in that a retaining wall is arranged on the outer side of an extended road, red mud-based light filler is filled between the retaining wall and the splicing steps, and a new road surface is paved between the retaining wall on the top surface of the red mud-based light filler and the splicing steps. Compared with the traditional road extension and widening technology, the backfill is light in weight, and the backfill part is self-compact, free from rolling and easy to construct, so that differential settlement of new and old road structures is effectively reduced, the land occupied by widening the road bed on the two-way outer side and releasing slope can be saved, and meanwhile, a large amount of industrial waste residues such as red mud are consumed and utilized, so that the method has the technical advantages of resource conservation and environmental protection, and has good popularization and application values.
Description
Technical Field
The invention relates to the field of industrial waste resource utilization and road engineering, in particular to a red mud-based lightweight filler road extension splicing structure and method.
Background
The reconstruction and expansion of the road requires widening the old road, which not only occupies a large amount of land to influence the use function of the land on the two sides of the original road, but also requires consuming a large amount of land and stone for filling the new road, thereby causing the waste of land resources. The red mud is solid waste residue discharged when alumina is extracted in the aluminum production industry, and 1.0-2.0 tons of red mud is additionally produced for each 1 ton of alumina. At present, red mud is mainly piled up in a dry dam form, so that a large amount of land is occupied, and environmental pollution and potential safety hazards are caused to surrounding areas. The red mud has the advantages of light density, good shrinkage stability, strong water retention and the like, but has the application problems of high alkalinity, low strength, poor water stability and the like, and cannot be directly used for engineering construction. Therefore, there are problems in road extension and widening and the effective consumption and utilization of red mud, and systematic research is urgent and necessary.
Disclosure of Invention
The technical task of the invention is to provide the red mud-based lightweight filler road extension splicing structure aiming at the defects of the prior art, and the road extension splicing integral structure which saves space and coordinates deformation is formed by technical complementation and synergistic effect among the old road function steps, the lightweight filler and the thin-wall retaining wall.
The invention further aims to provide a red mud-based lightweight filler road extension splicing method.
The technical task of the invention is realized in the following way: the red mud-based light filler road extension splicing structure comprises an original road structure and splicing steps and is characterized in that a retaining wall is arranged on the outer side of an extension road, red mud-based light filler is filled between the retaining wall and the splicing steps, and a new road surface is paved between the retaining wall on the top surface of the red mud-based light filler and the splicing steps.
The original road structure comprises a surface layer, a base layer, a roadbed and a roadbed, wherein the width of a spliced step of the surface layer is preferably 15-20 cm, the width of a spliced step of the base layer is preferably 30-40 cm, and the width of a spliced step of the roadbed (lime soil or two-ash soil) and the width of a spliced step of the roadbed are preferably 50-100 cm.
The step depth of the surface layer part, the base layer part and the roadbed part is consistent with the thickness of the original road structure layer, and the step thickness of the roadbed part is 50-80 cm.
The retaining wall preferably adopts a thin-wall structure, and reinforced rib plates can be arranged at intervals of 10-15 m. The width of the retaining wall is preferably 30-50 cm.
The lower end of the retaining wall can be provided with a retaining wall foundation, the thickness of the retaining wall foundation is preferably 15-45cm, the retaining wall foundation can be positioned below the original ground, the inner edge of the retaining wall foundation is flush with the lower edge of the reinforced rib plate, and the outer edge of the retaining wall foundation is 20-40cm away from the outer wall surface of the retaining wall.
The reinforced rib plates are triangular, vertical to the retaining wall and embedded into the red mud-based light filler.
The retaining wall thin-wall structure and/or the reinforced rib plate are/is preferably made of reinforced concrete materials, the strength grade of the concrete is not less than 30MPa, the impermeability grade is not less than P8, and the freezing resistance grade is not less than F200.
In order to provide enough support for the new road surface, the equivalent rebound modulus of the top of the red mud-based light filler is more than 50MPa, and the sedimentation difference of the new road and the old road is not more than 0.5%.
Preferably, the fluidity of the red mud-based light filler is 14-18 s, and the density is less than 1.05g/cm 3 The unconfined strength is not less than 1200kPa.
In order to enable the red mud-based light filler to meet the performance requirements, the red mud-based light filler is preferably prepared by mixing and stirring dry powder material components and water in a proportion, wherein the mass ratio of the dry powder material components to the water is 1: (0.65 to 0.75),
the dry powder material comprises the following raw materials in parts by weight:
80-88 parts of red mud
8-11 parts of high-temperature silicon powder
4-7 parts of II-type Portland cement
0.3-0.6 part of stabilizer
0.1-0.3 parts of a dispersing agent.
The weight ratio of the raw materials in the dry powder material components is preferably as follows:
82-86 parts of red mud
8.5-10 parts of high-temperature silicon powder
6-7 parts of II-type Portland cement
0.35-0.5 part of stabilizer
0.1-0.2 parts of a dispersing agent.
Wherein, the stabilizer can be zeolite powder or diatomite, preferably diatomite, with fineness not less than 200 meshes and loss on ignition not more than 0.5%;
the dispersing agent can be zinc stearate, calcium stearate or Ethylene Bis Stearamide (EBS), preferably Ethylene Bis Stearamide (EBS), with fineness of not less than 325 meshes and melting point of 140-145 ℃.
In the extension splicing structure, red mud-based light filler takes red mud as a main carrier, wherein one part of the red mud-based light filler has high Wen Guifen and low-valence cations adsorbed on the surfaces of red mud particles to form a granular structure through an exchange effect, and the other part of the red mud-based light filler has high Wen Guifen and fills gaps among the red mud particles and II-type silicate cement particles to form a colloid structure. Along with the hydration reaction of the type II silicate cement, the gel grows continuously, the porous structure and adsorptivity of the stabilizer (such as diatomite) promote the lap joint of hydration products to form a net structure, meanwhile, the viscosity reduction and dispersion effects of the dispersing agent (such as ethylene bis stearamide) are utilized to uniformly disperse the cementing whole, so that segregation is not generated while the flow property of the filler is ensured, and finally, the light filler with uniform texture, low shrinkage and certain strength is formed.
The red mud-based light filler is preferably cast in layers, and the thickness of each layer of casting is 30-60 cm, such as 40cm, 50cm and the like; after each layer of casting is finished and the curing is carried out for 48 hours, the next layer of casting is carried out. When the lowest daily air temperature is lower than 0 ℃, casting construction cannot be performed.
The red mud-based lightweight filler road extension splicing method is characterized by comprising the following steps of:
setting splicing steps after the original road structure is excavated;
a retaining wall is arranged on the outer side of the extended road;
filling red mud-based light filler between the retaining wall and the splicing steps;
and paving a new road surface between the retaining wall on the top surface of the red mud-based light filler and the splicing step.
The size requirement of the splicing steps, the performance requirement of each part, the position relation between the splicing steps and the retaining wall, the red mud-based light filler and the like can adopt the corresponding technical scheme in the splicing structure.
Compared with the prior art, the red mud-based light filler road extension splicing structure and method have the following outstanding beneficial effects:
the structure follows the principle of road structure mechanics and deformation coordination, and the interaction among structural steps, light filler and thin-wall retaining walls enables new and old roads to form an integral structure, so that the problems of uneven settlement, longitudinal cracking, long-term stability and the like in extension engineering are solved.
The quality of industrial solid waste red mud in the light filler used in the method is more than 80%, the utilization rate is high, and the recycling and large-scale recycling of the red mud can be realized; the lightweight backfill material has good fluidity and low contractility, and is easy for site construction; the light filler has low density, and can reduce dead weight of the road and active soil pressure on the retaining wall, thereby reducing the section size of the retaining wall.
And thirdly, the structure takes the thin-wall retaining wall as a newly-built road lateral retaining structure, so that the land range occupied by the slope of the roadbed is greatly reduced, the space utilization rate of two sides of the road is improved, and the structure is particularly suitable for application under the condition that two sides of the original road are limited by land due to the existence of sensitive points, buildings, industrial and mining roads, municipal roads and the like.
Drawings
FIG. 1 is a schematic structural diagram of a red mud-based lightweight filler road extension splicing structure in an embodiment of the invention;
FIG. 2 is a cross-sectional view of the schematic A-A structure shown in FIG. 1.
Description of the embodiments
The invention relates to a red mud-based light filler road extension splicing structure and a method thereof, which are described in detail below with specific embodiments with reference to the accompanying drawings.
Examples
1. Old road structure
The surface layer structure of the old road 1 expanded in the embodiment is an upper surface layer (4 cm SMA-13), a middle surface layer (5 cm AC-20) and a lower surface layer (6 cm AC-25); the basic structure is an upper basic layer (18 cm cement stabilized macadam) and a lower basic layer (18 cm cement stabilized macadam); the roadbed structure is 30cm lime stabilized soil, and the roadbed part below is 200cm plain filled soil.
2. Step with structure
The surface layer structure is provided with steps according to the thickness of the three layers of the old road, the heights of the steps are 4cm, 5cm and 6cm in sequence, and the width of each step is 15cm; the base layer structure is provided with steps according to the thickness of an upper base layer and a lower base layer of an old road, the height of each step is 18cm, and the width of each step is 35cm; the height of the steps of the roadbed structure is 30cm, and the width is 50cm; the height of the steps of the roadbed part is 50cm, and the width of the steps is 50cm.
3. Light thin wall retaining wall
The retaining wall 2 is of a thin-wall structure, and the retaining wall foundation 2.2 at the lower end of the retaining wall is buried below the original ground. The width dimension of the section of the retaining wall 2 is 40cm, the height reaches the designed elevation, and the rib plates 2.1 are arranged at intervals of 15 m. The reinforced rib plates 2.1 are triangular, are perpendicular to the retaining wall 2, and are embedded into the red mud-based light filler 3. The thickness of the retaining wall foundation 2.2 is 30cm, the inner edge of the retaining wall foundation is flush with the lower edge of the reinforced rib plate 2.1, and the outer edge of the retaining wall foundation is 25cm away from the outer wall surface of the retaining wall 2.
The retaining wall 2 and the ribbed rib plates 2.1 are of reinforced concrete structures, the strength grade of the concrete is 30MPa, the impermeability grade is P8, and the freezing resistance grade is F200. After construction, moisturizing and curing are carried out, and after the curing is finished and the curing is finished, 28d, the detected strength and durability meet the design requirements, the backfilling construction of the light filler is carried out.
4. Red mud-based light filler
In order to reduce the alkalinity of the red mud, improve the strength and the water stability and improve the construction working performance, the red mud is subjected to technical improvement treatment. The mass ratio is 84:9:6.5:0.4:0.1 red mud, high Wen Guifen, type II silicate cement, diatomite and ethylene bis stearamide are fully mixed to obtain a dry powder material, and the dry powder material and water are mixed according to the following proportion of 1: and (3) fully mixing the materials according to the mass ratio of 0.68 to obtain the red mud-based light filler for backfilling.
The fluidity of the red mud-based light filler is 14.8s, and the density is 1.01g/cm 3 The unconfined strength was 1320kPa.
The fineness of the diatomite is 200 meshes, and the ignition loss is 0.45%.
Ethylene Bis Stearamide (EBS) has a fineness of 325 mesh and a melting point of 143 ℃.
5. Backfilling construction of red mud-based light filler 3
And (3) pouring the red mud-based light filler 3 in layers during backfilling construction, wherein the thickness of each layer of pouring is 50cm. During pouring, the periphery of the backfill part is poured into the middle, so that no dead angle is ensured. After each layer of casting is finished and the curing is carried out for 48 hours, the next layer of casting is carried out.
6. New road surface 4 paving
After the final layer of the red mud-based light filler is cured, the top surface of the red mud-based light filler is subjected to an equivalent rebound modulus test, and the result is 59MPa, so that the red mud-based light filler meets the pavement paving requirement. And paving a new road surface 4 between the retaining wall 2 on the top surface of the red mud-based light filler and the splicing steps by a conventional paving method.
7. Integral inspection of structures
After the construction of the whole road structure is completed, the sedimentation difference of the new road and the old road is 0.23 percent. The whole structure has good rigidity, stability and coordinated deformation capability.
[ comparative example ]
Taking the extension splicing structure obtained in the embodiment as a test example, and taking the filling and slope releasing structure 5 of the conventional road extension splicing as a comparison example I; the expanded structure of the red mud-based light filler in the first embodiment is replaced by conventional filling soil, and is tested and compared as a second comparative example, and the test effect is shown in the following table:
| project structure | Packing density (g/cm) 3 ） | Intensity (kPa) | Equivalent modulus of resilience (MPa) | Width of structure (m) | Post-construction differential sedimentation (%) | Degree of compaction |
| Examples | 1.01 | 1320 | 59 | 9.5 | 0.23 | Compacting |
| Conventional soil filling and slope releasing structure | 1.78 | 970 | 37 | 13.0 | 0.51 | Compacting |
| Conventional filling and extending structure | 1.78 | 970 | 37 | 9.5 | 0.49 | Compacting |
According to the test effect, the red mud-based light filler road extension splicing structure is obviously improved in the aspects of strength, post-construction settlement difference and the like compared with the prior art.
Claims (9)
1. The utility model provides a red mud-based light filler road extension mosaic structure, includes original road structure and concatenation step, its characterized in that: the outside of the extended road is provided with a retaining wall, red mud-based light filler is filled between the retaining wall and the splicing steps, a new road surface is paved between the retaining wall on the top surface of the red mud-based light filler and the splicing steps,
the red mud-based light filler is prepared by mixing and stirring dry powder material components and water according to a proportion, wherein the mass ratio of the dry powder material components to the water is 1: (0.65 to 0.75),
the dry powder material comprises the following raw materials in parts by weight:
80-88 parts of red mud
8-11 parts of high-temperature silicon powder
4-7 parts of II-type Portland cement
0.3-0.6 part of stabilizer
0.1-0.3 part of dispersing agent,
the stabilizer is diatomite;
the dispersing agent is ethylene bis stearamide.
2. The red mud-based lightweight filler road extension splice structure according to claim 1, wherein: the original road structure comprises a surface layer, a base layer, a roadbed and a roadbed, wherein the width of a spliced step of the surface layer is 15-20 cm, the width of a spliced step of the base layer is 30-40 cm, and the width of a spliced step of the roadbed is 50-100 cm.
3. The red mud-based lightweight filler road extension splice structure according to claim 1 or 2, characterized in that: the retaining wall adopts a thin-wall structure, and reinforced rib plates are arranged at intervals of 10-15 m.
4. A red mud-based lightweight filler road extension splice structure according to claim 3, characterized in that: the reinforced rib plate is embedded into the red mud-based light filler.
5. The red mud-based lightweight filler road extension splice structure according to claim 4, wherein: the equivalent rebound modulus of the top of the red mud-based light filler is not less than 50MPa, and the sedimentation difference of new and old roads is not more than 0.5%.
6. The red mud-based lightweight filler road extension splice structure according to claim 5, wherein: the fluidity of the red mud-based light filler is 14-18 s, and the density is less than 1.05g/cm 3 The unconfined strength is not less than 1200kPa.
7. The red mud-based lightweight filler road extension splice structure according to claim 6, wherein:
the fineness of the diatomite is not less than 200 meshes, and the loss on ignition is not more than 0.5%;
the fineness of the ethylene bis stearamide is not less than 325 meshes, and the melting point is 140-145 ℃.
8. The red mud-based lightweight filler road extension splice structure according to claim 7, wherein: the red mud-based light filler is cast in layers, and the thickness of each layer of casting is 30-60 cm; after each layer of casting is finished and the curing is carried out for 48 hours, the next layer of casting is carried out.
9. The splicing method of the red mud-based light filler road extension splicing structure as claimed in any one of claims 1 to 8, which is characterized by comprising the following steps:
setting splicing steps after the original road structure is excavated;
a retaining wall is arranged on the outer side of the extended road;
filling red mud-based light filler between the retaining wall and the splicing steps;
and paving a new road surface between the retaining wall on the top surface of the red mud-based light filler and the splicing step.
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| CN201811157044.XA CN108951337B (en) | 2018-09-30 | 2018-09-30 | Red mud-based light filler road extension splicing structure and method |
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| CN201811157044.XA CN108951337B (en) | 2018-09-30 | 2018-09-30 | Red mud-based light filler road extension splicing structure and method |
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| CN108951337B true CN108951337B (en) | 2023-08-22 |
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Families Citing this family (4)
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| CN112144337A (en) * | 2020-09-04 | 2020-12-29 | 广东同创科鑫环保有限公司 | Cast-in-place construction process for modified red mud-based foam light soil |
| CN112030643A (en) * | 2020-09-04 | 2020-12-04 | 广东同创科鑫环保有限公司 | Construction method of red mud-based assembled roadbed for expressway |
| CN112144336A (en) * | 2020-09-04 | 2020-12-29 | 广东同创科鑫环保有限公司 | Method for preventing Bayer process red mud-based roadbed external seepage |
| CN113914164B (en) * | 2021-10-18 | 2023-01-31 | 重庆交通大学 | Widened roadbed structure of highway and construction method thereof |
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