CN117536045A - Carbon-sealed full-solid-waste assembled permeable pavement system - Google Patents
Carbon-sealed full-solid-waste assembled permeable pavement system Download PDFInfo
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- CN117536045A CN117536045A CN202311597854.8A CN202311597854A CN117536045A CN 117536045 A CN117536045 A CN 117536045A CN 202311597854 A CN202311597854 A CN 202311597854A CN 117536045 A CN117536045 A CN 117536045A
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- 239000002910 solid waste Substances 0.000 title claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 69
- 239000002689 soil Substances 0.000 claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 59
- 239000002893 slag Substances 0.000 claims abstract description 44
- 239000011449 brick Substances 0.000 claims abstract description 40
- 238000007789 sealing Methods 0.000 claims abstract description 39
- 239000002699 waste material Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000001723 curing Methods 0.000 claims description 42
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 18
- 238000005538 encapsulation Methods 0.000 claims description 18
- 239000003546 flue gas Substances 0.000 claims description 18
- 239000012634 fragment Substances 0.000 claims description 16
- 238000012423 maintenance Methods 0.000 claims description 16
- 238000010000 carbonizing Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 14
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 210000001503 joint Anatomy 0.000 claims description 9
- 230000000295 complement effect Effects 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 239000002440 industrial waste Substances 0.000 claims description 7
- 239000010813 municipal solid waste Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 239000002274 desiccant Substances 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 230000008929 regeneration Effects 0.000 claims description 2
- 238000011069 regeneration method Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 20
- 238000004064 recycling Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 86
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 14
- 238000003763 carbonization Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 7
- 239000001569 carbon dioxide Substances 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 239000000292 calcium oxide Substances 0.000 description 6
- 235000012255 calcium oxide Nutrition 0.000 description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 5
- 238000007667 floating Methods 0.000 description 5
- 230000002195 synergetic effect Effects 0.000 description 5
- 238000011282 treatment Methods 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
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- 238000010899 nucleation Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 208000005156 Dehydration Diseases 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000011418 maintenance treatment Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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- 239000012466 permeate Substances 0.000 description 1
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Classifications
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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
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/225—Paving specially adapted for through-the-surfacing drainage, e.g. perforated, porous; Preformed paving elements comprising, or adapted to form, passageways for carrying off drainage
- E01C11/226—Coherent pavings
-
- 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
-
- 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
- E01C3/006—Foundations for pavings made of prefabricated single units
-
- 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
- E01C3/04—Foundations produced by soil stabilisation
-
- 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
- E01C5/00—Pavings made of prefabricated single units
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a carbon-sealed full solid waste assembled water permeable pavement system, belongs to the technical field of urban road construction, and aims to construct a pavement system with high solid waste utilization rate and capable of realizing carbon sealing. The pavement system comprises a carbon-sealed and solidified slurry and slag soil base layer, an assembled interlocking permeable carbon-sealed and regenerated concrete base layer, a carbon-sealed and regenerated fine aggregate leveling layer, an assembled interlocking permeable carbon-sealed and regenerated brick pavement, a drainage pipeline and soil nails, wherein the carbon-sealed and solidified slurry and slag soil base layer, the assembled interlocking permeable carbon-sealed and regenerated concrete base layer, the carbon-sealed and regenerated fine aggregate leveling layer and the assembled interlocking permeable carbon-sealed and regenerated brick pavement are sequentially arranged from bottom to top, and the drainage pipeline is arranged in the assembled interlocking permeable carbon-sealed and regenerated concrete base layer, and the soil nails vertically penetrate through the assembled interlocking permeable carbon-sealed and regenerated concrete base layer and reach the carbon-sealed and solidified slurry and slag soil base layer. The usage amount of the construction waste and the industrial solid waste in the pavement system material can reach 60% -85%, and the total carbon sealing amount is more than 3%, so that the high-efficiency recycling utilization of the construction waste and the industrial solid waste can be realized.
Description
Technical Field
The invention belongs to the technical field of urban road construction, and relates to a carbon-sealed full-solid-waste assembled permeable pavement system.
Background
The permeable pavement is a key component of a sponge city. During rainfall, rainwater permeates into the underground soil body downwards through the permeable pavement, so that groundwater resources can be supplemented, water accumulation on the pavement can be reduced, and urban drainage load can be reduced; in sunny days, the moisture in the soil body can be evaporated upwards through the pores of the permeable pavement, so that the environmental humidity can be adjusted.
The common permeable pavement system is usually formed by paving permeable concrete, rolling, laminating, curing and spraying sealing agent, and has the advantages of complex construction flow, long curing time and difficult quality control. The water permeability is realized through the pores of the permeable concrete. In the use, road surface dust easily blocks the hole, reduces water permeability, and the high-pressure squirt is needed to be washed regularly, and the maintenance requirement is high, often loses water permeability after using for a period of time.
Therefore, engineers have developed fabricated permeable pavement using prefabricated blocks or blocks as roadbeds, and utilizing inter-block caulking structures for drainage. The pavement design sequentially comprises a surface layer, a leveling layer, a base layer, a roadbed layer and a soil base layer from top to bottom, wherein the surface layer is composed of high-strength compact bricks; the leveling layer and the base layer are composed of a crushed stone structural layer; the roadbed layer consists of prefabricated roadbeds. The invention relates to an assembled interlocking slit water permeable pavement system, which is provided with an application number 201820706328.9, and comprises an interlocking slit water permeable brick layer, wherein a washing rice layer, a first water permeable filter layer and a macadam cushion layer are sequentially arranged below the brick layer, and an assembled interlocking water permeable frame layer is arranged between the first water permeable filter layer and the macadam cushion layer. According to the invention, the assembled gap permeable pavement is provided with an application number 201822255783.4, and sequentially comprises a plain soil layer, a permeable base layer, a permeable isolation filter layer, a leveling layer and a permeable road surface layer from bottom to top, wherein a drainage structure is arranged on the plain soil layer, and the permeable base layer is assembled by interlocking base layer building blocks; the permeable road surface layer is formed by assembling interlocking slit type permeable bricks. The patent bottom layer adopts the common soil base layer as the bottom layer foundation, and the common soil base layer has poor water stability, is easy to generate uneven sedimentation under the condition of long-time rainwater soaking, and influences the flatness of the upper pavement. In the above patent, the pavement system material is mainly natural materials such as plain soil, broken stone and the like, and belongs to non-renewable resources. The invention patent 'assembled interlocking slit water permeable pavement system' realizes the interlocking in the horizontal direction through the side wall protrusions, but does not restrict the movement in the vertical direction.
Disclosure of Invention
The invention provides a carbon-sealed full-solid-waste assembled water-permeable pavement system aiming at the problems in the prior art, and aims to construct a pavement system with high solid-waste utilization rate and capable of realizing carbon sealing. The system is suitable for light-load pavements such as parking lots, squares, internal roads of parks and sidewalks.
The invention is realized in the following way:
the utility model provides a full solid useless assembled permeable pavement system of carbon encapsulation, its characterized in that, includes that carbon encapsulation solidification mud dregs basic unit, assembled interlocking permeable carbon encapsulation recycled concrete basic unit, carbon encapsulation regeneration fine aggregate screed-coat and assembled interlocking permeable carbon encapsulation recycled brick road surface that sets gradually from bottom to top still include the setting is in drainage pipe in the assembled interlocking permeable carbon encapsulation recycled concrete basic unit and follow the perpendicular penetration of assembled interlocking permeable recycled carbon encapsulation concrete basic unit to the soil nail of carbon encapsulation solidification mud dregs basic unit, solid useless amount in the pavement system accounts for more than 60%, and overall carbon encapsulation is more than 3%.
Preferably, the carbon-sealed and solidified slurry slag soil base layer is prepared from engineering slurry, engineering slag soil and carbon-sealed and solidified slag and a solidifying agent; the assembled interlocking permeable carbon-sealed recycled concrete base layer comprises a honeycomb permeable frame (21) and carbonized recycled coarse aggregate filled in frame holes of the permeable frame; the carbon-sealed regenerated fine aggregate leveling layer is paved by carbonized regenerated fine aggregates and is used for leveling; the fabricated interlocking permeable carbon sealed recycled brick pavement is formed by splicing interlocking slit bricks prepared from recycled aggregate; the soil nails are arranged every 1-10 m, the top surface of each soil nail is anchored in the permeable frame (21), the bottom of each soil nail is vertically inserted into the carbon sealing and curing slurry residue soil base layer, the soil nails are fixed by grouting the periphery of the lower part from the holes at the upper part to form a mortar layer, and the soil nails are used for resisting floating of the whole pavement structure and preventing the pavement structure from floating and damaging during urban waterlogging.
Preferably, interlocking surfaces are arranged on the periphery of the permeable frames, vertical steps are arranged on the interlocking surfaces in the vertical direction, horizontal steps are arranged in the horizontal direction, the vertical steps of adjacent permeable frames are in complementary butt joint, and the horizontal steps of adjacent permeable frames are in complementary butt joint so as to limit the movement of the permeable frames in the three-dimensional direction.
Preferably, a semi-cylindrical groove is arranged at the lower part of the permeable frame, and a drainage pipeline is placed in the groove.
Preferably, gaps around the interlocking slit bricks are filled with recycled fine aggregate subjected to carbonization treatment, semicircular protrusions and wedge-shaped protrusions are respectively arranged around the interlocking slit bricks, and the semicircular protrusions and the wedge-shaped protrusions of adjacent interlocking slit bricks are mutually clamped to limit movement of the brick body in all directions.
Preferably, the preparation method of the carbon-sealed and solidified slurry residue soil base layer comprises the following steps:
discharging the engineering waste mud into a mud pit, adding 3-8% of compound flocculant in volume fraction into the mud pit, stirring, standing for 2-4 hours, and then pumping out supernatant fluid to obtain primary dried mud with 50-80% of water content;
adding 3-8% of a drying agent by volume fraction into the primary drying slurry, and stirring to obtain drying slurry with strength improved by more than 50%;
placing industrial waste steel slag into a curing kettle, and using air pressure of 0.05-0.2MPa and CO 2 Carbonizing and curing the flue gas with the concentration of 15-40% for 1-3h;
uniformly mixing the crushed drying slurry, engineering slag, carbonized and maintained steel slag and curing agent according to the mass ratio of 0.1-0.3, 0.2-0.6, 0.1-0.3 and 0.03-0.08, and layering, paving and compacting each layer by 20 cm.
Preferably, the method for preparing the permeable frame comprises the following steps:
crushing demolished garbage into fragments with the particle size of 5-10 mm, placing the fragments into a curing kettle, and using the air pressure of 0.1-0.2MPa and CO 2 Carbonizing and curing the flue gas with the concentration of 15-40% for 2-3h to prepare carbonized and cured recycled aggregate with the crushing index reduced by more than 5% and the water absorption reduced by more than 5%;
the carbonized maintenance recycled aggregate is taken as aggregate, mixed with fine aggregate, cementing material and water to form slurry, and CO is injected during stirring 2 15% -40% of flue gas, and secondary carbon sealing is realized;
pouring the slurry into a mold after uniformly stirring, removing the mold, and performing air pressure of 0.1-0.2MPa and CO 2 And carbonizing and curing the flue gas with the concentration of 15-40% for 2-5h to realize three times of carbon sealing and storage to form the permeable frame.
Preferably, the preparation method of the carbon-sealed recycled fine aggregate leveling layer comprises the following steps:
the building demolishing garbage is crushed into fragments with the grain diameter of 1mm-5mm, the fragments are placed in a curing kettle, the air pressure is 0.05-0.2MPa, and CO 2 Carbonizing and curing the flue gas with the concentration of 15-40% for 1-3h to prepare the carbon-sealed regenerated fine aggregate with the crushing index reduced by more than 5% and the water absorption reduced by more than 5%;
and paving the carbon-sealed recycled fine aggregate on the assembled interlocking permeable recycled concrete base layer to form the carbon-sealed recycled fine aggregate leveling layer.
Preferably, the method for preparing the interlocking slit bricks comprises the following steps:
crushing building demolition waste into fragments with the particle size of 2-5 mm, placing the fragments into a curing kettle, and using the air pressure of 0.1-0.2MPa and CO 2 Carbonizing and curing the flue gas with the concentration of 15-40% for 1-3h to prepare carbonized and cured recycled aggregate with the crushing index reduced by more than 5% and the water absorption reduced by more than 5%;
and (3) taking the carbonized maintenance recycled aggregate as aggregate, mixing with cementing materials and water, uniformly stirring, and pressing and forming by a brick press to form the interlocking slit bricks.
The carbon-sealed full-solid waste assembled water permeable pavement system provided by the invention has the following beneficial effects:
(1) The pavement system is manufactured by adopting full solid waste, the usage ratio of the construction waste to the industrial solid waste in the pavement system material can reach 60% -85%, and the high-efficiency recycling of the construction waste and the industrial solid waste can be realized. In the pavement system, the carbon-sealed and solidified slurry and slag soil base layer is prepared by utilizing engineering slurry, engineering slag and industrial waste steel slag, the assembled interlocking permeable carbon-sealed and recycled concrete base layer, the carbon-sealed and recycled fine aggregate leveling layer and the carbon-sealed and recycled fine aggregate leveling layer are prepared by utilizing recycled aggregate, and the assembled interlocking permeable carbon-sealed and recycled concrete base layer adopts a porous structure to reduce the consumption of cementing materials such as cement and increase the solid waste consumption of recycled aggregate and the like. The pavement system is used for cooperatively disposing construction waste and industrial solid waste, and particularly, engineering slurry which is difficult to dispose is utilized.
(2) The pavement system can realize stable and efficient carbon sealing, the total carbon sealing quantity is more than 3%, and the performance is optimized through the synergistic effect of the pavement system and solid wastes. In a pavement system, the carbon-sealed solidified slurry and muck base layer is carbonized and maintained by utilizing steel slag with high free calcium oxide content, and durability reduction caused by free calcium oxide is reduced while carbon sealing. Various coarse and fine aggregates utilize the construction demolishd garbage recycled aggregates subjected to carbonization maintenance treatment, so that the density and strength of the recycled aggregates are improved while multi-mode carbon sealing is realized, and the load requirement of a pavement system is met. The recycled concrete porous interlocking frame is manufactured by adding carbon dioxide into 3 links of aggregate maintenance, slurry mixing and product maintenance to form carbonization depth, so that the carbon sealing quantity of the product is improved.
(3) The pavement system has good three-dimensional stability. The carbon-sealed solidified slurry residue soil base layer at the lowest layer of the pavement system is compounded by using carbonized steel slag and a solidifying agent, so that the strength, compactness and water stability of engineering slurry and engineering residue soil are enhanced, and uneven settlement of a common plain soil base pavement under long-time rainwater soaking is avoided. The pavement system base layer is assembled by using the honeycomb porous interlocking frames, has three-dimensional interlocking performance, and effectively improves the stability and durability of the base layer. The soil nails vertically penetrating through the interlocking permeable recycled concrete base layer to the carbon-sealed and solidified slurry and residue soil base layer are matched with the three-dimensional interlocking frame, so that the integral anti-floating performance of the pavement system is improved, the pavement can still maintain compact arrangement and the pavement is smooth in long-term use and in heavy rainy days, and the stability of the pavement system is further improved.
(4) The pavement system adopts an assembled structure, is convenient to construct, reduces the influence of site construction on the surrounding environment, and ensures the construction quality. Compared with the common cast-in-situ permeable concrete pavement, the construction period is shortened by 80%, the noise is reduced by 15dB, the construction dust is obviously reduced, the method is particularly suitable for organic updating of cities and reconstruction of old communities, and the influence on daily life of surrounding residents is reduced to the greatest extent.
(5) The pavement system realizes the function of water permeability through the structural gaps, is not easy to block in the use process, and is simple and convenient to maintain. Components in the pavement system, such as interlocking slit bricks, can be singly replaced after being broken locally after long-term use, so that the maintenance cost of the permeable pavement is reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of a pavement system;
FIG. 2 is a schematic view of a first angular configuration of a permeable frame;
FIG. 3 is a schematic view of a second angular configuration of a permeable frame;
FIG. 4 is a schematic view of a partial structure of an assembled interlocking water permeable carbon sequestering recycled concrete foundation;
fig. 5 is a schematic view of a partial structure of an assembled interlocking water-permeable carbon-sealed recycled brick pavement.
The drawings are marked with the following description: 1. carbon sealing and curing the slurry residue soil base layer; 2. assembling type interlocking permeable carbon sealing and storing recycled concrete base layer; 3. carbon-sealed regenerated fine aggregate leveling layer; 4. assembling type interlocking permeable carbon sealing and regenerating brick pavement; 5. a drainage pipe; 6. soil nails; 7. a mortar layer; 21. a water permeable frame; 22. regenerating coarse aggregate; 211. a frame hole; 212. a horizontal step; 213. a splice hole; 214. a vertical step; 215. a groove; 41. interlocking slit bricks; 411. a semicircular bulge; 412. wedge-shaped protrusions.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, so that the technical scheme of the present invention can be understood and mastered more easily. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
1-5, the permeable pavement system comprises a carbon-sealed solidified slurry slag soil base layer 1, an assembled interlocking permeable carbon-sealed recycled concrete base layer 2, a carbon-sealed recycled fine aggregate leveling layer 3 and an assembled interlocking permeable carbon-sealed recycled brick pavement 4 which are sequentially arranged from bottom to top, wherein the four layers of structures adopt solid wastes with volume fractions of more than 60 percent to form the full solid waste pavement system. The assembled interlocking permeable carbon sealing and regenerating concrete base layer 2 is internally provided with a drainage pipeline 5 and soil nails 6 which vertically penetrate through the assembled interlocking permeable carbon sealing and regenerating concrete base layer 2 to the carbon sealing and curing slurry residue soil base layer 1, the solid waste amount in the pavement system accounts for more than 60 percent, and the total carbon sealing and storing amount is more than 3 percent. The solid waste comprises construction waste and industrial solid waste, the construction waste comprises engineering slurry, engineering dregs and demolition waste, and the industrial solid waste comprises industrial waste steel slag.
The carbon sealing and curing slurry and slag soil base layer 1 is prepared from engineering slurry and engineering slag soil compounded carbon sealing and curing steel slag and curing agent. The preparation method of the carbon-sealed and solidified slurry residue soil base layer 1 comprises the following steps:
and 1, discharging engineering slurry into a slurry pond, adding 3-8% of compound flocculant in volume fraction into the slurry pond, stirring, using inorganic flocculant and polymeric flocculant in combination for the compound flocculant, standing for 2-4 hours, and then pumping out supernatant fluid to obtain the primary drying slurry with the water content reduced by 50-80%.
And 2, adding 3-8% of a drying agent by volume into the primary drying slurry, and stirring to obtain the drying slurry with the strength improved by more than 50%. The drying agent can be quicklime or a material with a slurry drying function such as HAS soil curing agent.
Step 3, placing the industrial waste steel slag in a curing kettle, and using the air pressure of 0.05-0.2MPa and CO 2 Carbonizing and curing the flue gas with the concentration of 15-40% for 1-3h. The industrial waste steel slag is carbonized and maintained to form carbon-sealed steel slag.
And 4, uniformly mixing the crushed dried slurry, engineering slag, carbonized and maintained industrial waste steel slag and curing agent according to the mass ratio of 0.1-0.3, 0.2-0.6, 0.1-0.3 and 0.03-0.08, and layering, paving and compacting each layer by 20 cm. The strength, compactness and water stability of the engineering slurry and the engineering slag soil can be enhanced by the process of compounding the engineering slurry, the engineering slag soil with the carbon-fixing steel slag and the curing agent, so that the problem that the plain soil base layer is easy to deform and unevenly settle after soaking in water is avoided.
And the engineering slurry, the engineering slag soil and the steel slag are synergistically modified by utilizing a solid waste synergistic mechanism to be used for the road foundation layer. The engineering slurry is construction waste produced by foundation construction such as engineering bored piles, rotary digging piles and the like, and has high water content, high cost of commonly adopted dehydration treatment such as filter pressing and drying, long time consumption and low recycling rate. The engineering dregs are construction waste produced by engineering foundation construction excavation, and because the strength, compactness and water stability are poor, the engineering dregs are directly used for a road base layer and are difficult to meet the standard requirements. The steel slag is the waste slag produced by smelting steel, has certain activity, but has poor stability due to the fact that the steel slag contains more free calcium oxide.
The invention processes engineering mud in two steps: firstly, combining an inorganic flocculant and a polymeric flocculant by the compound flocculant, wherein the inorganic flocculant destabilizes and coagulates slurry colloid, and a chain molecular structure stretched by the polymeric flocculant plays a role of adsorption bridging and is connected with tiny coagulated particles to coagulate the slurry colloid; and secondly, the curing agent further coagulates the coagulated particles in the primary drying slurry into more compact lumps, releases part of free water and improves the strength of the drying slurry.
According to the invention, the steel slag is subjected to carbonization treatment, free calcium oxide in the steel slag is induced to react with carbon dioxide through proper carbonization maintenance conditions, so that unstable free calcium oxide is consumed, and carbon sealing is realized.
In the step 4 of the preparation method of the carbon-sealed and solidified slurry muck base layer 1, the steel slag and the solidifying agent are combined with the residual moisture in the dried slurry, so that the activities of silicon and aluminum minerals in the engineering slurry and the engineering muck can be excited to generate a hard setting reaction, a relatively stable three-dimensional reticular microstructure is formed, and the strength is generated. The steps are overlapped layer by layer, the strength, compactness and water stability of the engineering slurry and the engineering slag soil are enhanced by utilizing the synergistic effect of the components, and the problems that the water content of the engineering slurry is higher, the strength of the engineering slag soil is lower, and the steel slag stability is poor and is difficult to use are solved.
The assembled interlocking permeable carbon sealing recycled concrete base layer 2 comprises a permeable frame 21, the cellular permeable frame 21 can be assembled to form a porous interlocking structure, frame holes 211 of the permeable frame 21 are filled with carbonized recycled coarse aggregate 22, interlocking surfaces are arranged on the periphery of the permeable frame 21, vertical steps 214 are arranged on the interlocking surfaces in the vertical direction, horizontal steps 212 are arranged in the horizontal direction, the vertical steps 214 of adjacent permeable frames 21 are in complementary butt joint, and the horizontal steps 212 of adjacent permeable frames 21 are in complementary butt joint so as to limit the movement of the permeable frame 21 in the three-dimensional direction. The facing of the steps of the opposite horizontal steps 212 on the same water permeable frame 21 is opposite, and the complementary butt joint of the horizontal steps 212 restricts the horizontal movement of the water permeable frame 21, and the movement of the water permeable frame 21 in the up-down and left-right directions is restricted by taking fig. 3 as a view angle. The facing of the steps of the vertical steps 214 opposite to the same permeable frame 21 is opposite, and the complementary butt joint of the vertical steps 214 restricts the permeable frame 21 from moving vertically upwards, and takes fig. 2 as a view angle, and restricts the permeable frame 21 from moving up and down.
The four permeable frames 21 together enclose a splicing hole 213, and the splicing hole 213 is filled with the recycled coarse aggregate 22 subjected to carbonization treatment. The preparation method of the permeable frame 21 comprises the following steps:
step 1, crushing demolished garbage into fragments with the particle size of 5mm-10mm, placing the fragments into a curing kettle, and using the air pressure of 0.1-0.2MPa and CO 2 Carbonizing and curing the flue gas with the concentration of 15-40% for 2-3h to prepare carbonized and cured recycled aggregate with the crushing index reduced by more than 5% and the water absorption reduced by more than 5%, wherein the crushing value of the aggregate is less than 30% and the water absorption is less than 2%.
Step 2, taking carbonized maintenance recycled aggregate as aggregate, mixing with fine aggregate, cementing material and water to form slurry, and injecting CO during stirring 2 15% -40% of flue gas, and secondary carbon sealing is realized;
step 3, pouring the slurry into a mold after uniformly stirring, removing the mold, and performing pressure adjustment to 0.1-0.2MPa and CO 2 And carbonizing and curing the flue gas with the concentration of 15-40% for 2-5h to realize three times of carbon sealing and storage to form the permeable frame 21.
The three-time carbon sealing layer-by-layer progressive process is utilized to greatly increase the carbon sealing quantity and the carbon sealing depth, and meanwhile, the product performance is optimized. Because the common concrete has compact texture, the carbon dioxide is difficult to penetrate to depth, and the carbon sealing amount and the carbon sealing depth of single carbonization maintenance are often not ideal. In the invention, the permeable frame 21 is manufactured by adding carbon dioxide in 3 links of aggregate maintenance, slurry mixing and product maintenance: the carbonization maintenance aggregate improves the density and strength of the recycled aggregate, reduces the water absorption, reduces the water consumption in the subsequent slurry mixing stage, and improves the strength of the permeable frame 21; carbon dioxide is introduced in the slurry mixing stage to enable the carbon dioxide and part of calcium hydroxide in the slurry to react in the solution to form tiny calcium carbonate crystals, the process is called microcrystallization, the calcium carbonate crystals are used as nucleation sites in a system, the stability and compactness of a CSH gel system are enhanced, and nucleation sites are provided for the growth of calcium carbonate in the subsequent finished product maintenance process; and in the process of carbonizing and maintaining the product, carbon dioxide continuously grows on the calcium carbonate micro-crystals in the previous step, so that micro-pores of a matrix are filled, the development of strength is accelerated, and the surface compactness is improved. The carbon sealing rings of the three links are mutually buckled and mutually promoted to form carbonization depth, so that the problem that single carbonization is difficult to develop to depth is avoided, and the product performance is effectively improved.
The top surface of the soil nail 6 is anchored on the surface of the permeable frame 21, and the three-dimensional stability of the pavement system is greatly improved by utilizing the synergistic effect of the three-dimensional interlocking basic structure and the soil nail 6 and the cooperation of the solidification of the slurry residue soil basic layer. Due to rain wash, the roadbed of the permeable pavement is easy to generate uneven settlement. According to the invention, the assembled interlocking permeable carbon sealing recycled concrete base layer 2 is utilized to form a three-dimensional stable interlocking single-layer structure, and the concrete base layer is firmly connected with the carbon sealing solidified slurry residue soil base layer 1 through the soil nails 6, so that floating damage caused by rising of underground water level in urban waterlogging is avoided. Meanwhile, the strength and the water stability of the carbon-sealed and solidified slurry muck base layer 1 are good, and the base layer has good anchoring capability. The three-dimensional stability of the pavement system is greatly improved due to the synergistic effect of the carbon sealing and curing slurry residue soil base layer 1, the assembled interlocking permeable carbon sealing and recycling concrete base layer 2 and the soil nails 6. The lower part of the permeable frame 21 is provided with semi-cylindrical grooves 215, the grooves 215 of adjacent permeable frames 21 are mutually in butt joint communication, a drainage pipeline 5 is placed in the grooves 215, the drainage effect is improved, one half of the drainage pipeline 5 is positioned in the grooves 215, and one half of the drainage pipeline is embedded into the carbon-sealed and solidified slurry and muck base layer 1.
The soil nails 6 are arranged every 1-10 m, the top surface of each soil nail is anchored on the permeable frame 21, the bottom of each soil nail is vertically inserted into the carbon-sealed and solidified slurry residue soil base layer 1, the soil nails 6 are fixed by grouting from the upper holes to the periphery of the lower part to form a mortar layer 7, and the soil nails are used for the integral anti-floating of the pavement structure.
The carbon-sealed regenerated fine aggregate leveling layer 3 is paved by carbonized regenerated fine aggregates and used for leveling. The preparation method of the carbon-sealed regenerated fine aggregate leveling layer 3 comprises the following steps:
step 1, placing fragments with the particle size of 1mm-5mm formed by crushing construction demolition waste into a curing kettle, and using air pressure of 0.05-0.2MPa and CO 2 Carbonizing and curing the flue gas with the concentration of 15-40% for 1-3h to prepare the carbon-sealed regenerated fine aggregate with the crushing index reduced by more than 5% and the water absorption reduced by more than 5%, wherein the crushing value of the fine aggregate is less than 20% and the water absorption is less than 2%.
And step 2, paving the carbon-sealed recycled fine aggregate on the assembled interlocking permeable recycled concrete base layer 2 to form the carbon-sealed recycled fine aggregate leveling layer 3.
As shown in fig. 5, the fabricated interlocking water-permeable carbon-sealed recycled brick pavement 4 is formed by splicing interlocking slit bricks 41 prepared from recycled aggregate. Gaps around the interlocking slit bricks 41 are filled with recycled fine aggregate subjected to carbonization treatment, semicircular protrusions 411 and wedge-shaped protrusions 412 are respectively arranged around the interlocking slit bricks 41, and the semicircular protrusions 411 and the wedge-shaped protrusions 412 of adjacent interlocking slit bricks 41 are mutually clamped to limit movement of the brick body in all directions. The preparation method of the interlocking slit brick 41 comprises the following steps:
step 1, demolishing garbageCrushing into 2-5 mm fragments, placing into a curing kettle, and placing into a pressure of 0.1-0.2MPa and CO 2 Carbonizing and curing for 1-3h by using 15% -40% flue gas to prepare carbonized and cured recycled aggregate with crushing index reduced by more than 5% and water absorption reduced by more than 5%, wherein the crushing value of the aggregate is less than 20% and the water absorption is less than 2%.
And 2, taking carbonized maintenance recycled aggregate as aggregate, mixing the aggregate with cementing materials and water, uniformly stirring, and then pressing and forming by a brick press to form the interlocking slit bricks 41.
Claims (9)
1. The utility model provides a full solid useless assembled permeable pavement system of carbon encapsulation, its characterized in that, includes carbon encapsulation solidification mud dregs basic unit (1), assembled interlocking permeable carbon encapsulation recycled concrete basic unit (2), carbon encapsulation regeneration fine aggregate screed-coat (3) and assembled interlocking permeable carbon encapsulation recycled brick road surface (4) that set gradually from bottom to top, still including setting up drainage pipe (5) in assembled interlocking permeable carbon encapsulation recycled concrete basic unit (2) and follow assembled interlocking permeable carbon encapsulation recycled concrete basic unit (2) run through perpendicularly to soil nail (6) of carbon encapsulation solidification mud dregs basic unit (1), solid useless quantity in the road surface system accounts for more than 60%, and total carbon encapsulation quantity is more than 3%.
2. The carbon-sealed all-solid-waste fabricated water-permeable pavement system according to claim 1, wherein the carbon-sealed solidified slurry slag soil base layer (1) is prepared from engineering slurry, engineering slag soil compounded carbon-sealed steel slag and a solidifying agent; the assembled interlocking permeable carbon sealed recycled concrete base layer (2) comprises a honeycomb permeable frame (21) and carbonized recycled coarse aggregate filled in frame holes (211) of the permeable frame; the carbon-sealed regenerated fine aggregate leveling layer (3) is paved by carbonized regenerated fine aggregates and is used for leveling; the assembled interlocking permeable carbon sealing recycled brick pavement (4) is formed by splicing interlocking gap bricks (41) prepared from recycled aggregate; the soil nails (6) are arranged every 1-10 m, the top surface of each soil nail is anchored on the permeable frame (21), the bottom of each soil nail is vertically inserted into the carbon sealing and curing slurry residue soil base layer (1), and the soil nails (6) are fixed by grouting from the holes at the upper part to the periphery of the lower part to form a mortar layer (7).
3. The carbon-sealed all-solid-waste fabricated water permeable pavement system according to claim 2, wherein interlocking surfaces are arranged around the water permeable frames (21), vertical steps (214) are arranged on the interlocking surfaces in the vertical direction, horizontal steps (212) are arranged in the horizontal direction, the vertical steps of adjacent water permeable frames are in complementary butt joint, and the horizontal steps of adjacent water permeable frames are in complementary butt joint so as to limit the movement of the water permeable frames in the three-dimensional direction.
4. The carbon-sealed all-solid-waste fabricated water permeable pavement system according to claim 2, wherein a semi-cylindrical groove (215) is arranged at the lower part of the water permeable frame, and a drainage pipeline (5) is arranged in the groove.
5. The carbon-sealed full solid waste fabricated water permeable pavement system according to claim 2, wherein gaps (42) around the interlocking gap bricks (41) are filled with carbonized regenerated fine aggregate, semicircular protrusions (411) and wedge-shaped protrusions (412) are respectively arranged around the interlocking gap bricks (41), and the semicircular protrusions and the wedge-shaped protrusions of adjacent interlocking gap bricks are mutually clamped to limit movement of the brick body in all directions.
6. The carbon-sealed all-solid-waste fabricated water permeable pavement system according to claim 1, wherein the preparation method of the carbon-sealed solidified slurry and muck base layer (1) comprises the following steps:
discharging the engineering waste mud into a mud pit, adding 3-8% of compound flocculant in volume fraction into the mud pit, stirring, standing for 2-4 hours, and then pumping out supernatant fluid to obtain primary dried mud with 50-80% of water content;
adding 3-8% of a drying agent by volume fraction into the primary drying slurry, and stirring to obtain drying slurry with strength improved by more than 50%;
placing industrial waste steel slag into a curing kettle, and using air pressure of 0.05-0.2MPa and CO 2 Concentration is 15%-40% of flue gas is carbonized and maintained for 1-3h;
uniformly mixing the crushed drying slurry, engineering slag, carbonized and maintained steel slag and curing agent according to the mass ratio of 0.1-0.3, 0.2-0.6, 0.1-0.3 and 0.03-0.08, and layering, paving and compacting each layer by 20 cm.
7. The carbon-sealed all-solid-waste fabricated water permeable pavement system according to claim 2, wherein the preparation method of the water permeable frame (21) comprises the following steps:
crushing demolished garbage into fragments with the particle size of 5-10 mm, placing the fragments into a curing kettle, and using the air pressure of 0.1-0.2MPa and CO 2 Carbonizing and curing the flue gas with the concentration of 15-40% for 2-3h to prepare carbonized and cured recycled aggregate with the crushing index reduced by more than 5% and the water absorption reduced by more than 5%;
the carbonized maintenance recycled aggregate is taken as aggregate, mixed with fine aggregate, cementing material and water to form slurry, and CO is injected during stirring 2 15% -40% of flue gas, and secondary carbon sealing is realized;
pouring the slurry into a mold after uniformly stirring, removing the mold, and performing air pressure of 0.1-0.2MPa and CO 2 And carbonizing and curing the flue gas with the concentration of 15-40% for 2-5h to realize three times of carbon sealing and form the permeable frame (21).
8. The carbon-sealed all-solid-waste fabricated water permeable pavement system according to claim 1, wherein the preparation method of the carbon-sealed recycled fine aggregate leveling layer (3) comprises the following steps:
the building demolishing garbage is crushed into fragments with the grain diameter of 1mm-5mm, the fragments are placed in a curing kettle, the air pressure is 0.05-0.2MPa, and CO 2 Carbonizing and curing the flue gas with the concentration of 15-40% for 1-3h to prepare the carbon-sealed regenerated fine aggregate with the crushing index reduced by more than 5% and the water absorption reduced by more than 5%;
and paving the carbon-sealed recycled fine aggregate on the assembled interlocking permeable recycled concrete base layer (2) to form the carbon-sealed recycled fine aggregate leveling layer (3).
9. The carbon-sealed all-solid-waste fabricated water permeable pavement system according to claim 2, wherein the preparation method of the interlocking slit bricks (41) comprises the following steps:
crushing building demolition waste into fragments with the particle size of 2-5 mm, placing the fragments into a curing kettle, and using the air pressure of 0.1-0.2MPa and CO 2 Carbonizing and curing the flue gas with the concentration of 15-40% for 1-3h to prepare carbonized and cured recycled aggregate with the crushing index reduced by more than 5% and the water absorption reduced by more than 5%;
the carbonized maintenance recycled aggregate is taken as aggregate, mixed with cementing material and water, and pressed and molded by a brick press after being uniformly stirred to form the interlocking slit brick (41).
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