CN116514463A - Full-underground traffic engineering construction site waste regenerated brick and preparation method thereof - Google Patents
Full-underground traffic engineering construction site waste regenerated brick and preparation method thereof Download PDFInfo
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- CN116514463A CN116514463A CN202310459289.2A CN202310459289A CN116514463A CN 116514463 A CN116514463 A CN 116514463A CN 202310459289 A CN202310459289 A CN 202310459289A CN 116514463 A CN116514463 A CN 116514463A
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- 239000002699 waste material Substances 0.000 title claims abstract description 153
- 239000011449 brick Substances 0.000 title claims abstract description 60
- 238000010276 construction Methods 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 38
- 239000004576 sand Substances 0.000 claims abstract description 146
- 239000004567 concrete Substances 0.000 claims abstract description 122
- 238000005520 cutting process Methods 0.000 claims abstract description 53
- 230000005641 tunneling Effects 0.000 claims abstract description 52
- 239000002893 slag Substances 0.000 claims abstract description 47
- 239000002689 soil Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000001125 extrusion Methods 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims description 111
- 238000000034 method Methods 0.000 claims description 51
- 239000002245 particle Substances 0.000 claims description 40
- 239000007787 solid Substances 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 30
- 238000009412 basement excavation Methods 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 18
- 238000004064 recycling Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 abstract description 17
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 9
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 9
- 239000004571 lime Substances 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 4
- 239000002734 clay mineral Substances 0.000 abstract description 3
- 230000008929 regeneration Effects 0.000 abstract description 3
- 238000011069 regeneration method Methods 0.000 abstract description 3
- 238000001879 gelation Methods 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 135
- 239000008239 natural water Substances 0.000 description 8
- 238000004537 pulping Methods 0.000 description 8
- 238000005086 pumping Methods 0.000 description 8
- 230000036571 hydration Effects 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
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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
- C04B28/001—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 unburned clay
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0263—Hardening promoted by a rise in temperature
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a waste regenerated brick for a whole underground traffic engineering construction site and a preparation method thereof, and belongs to the technical field of regeneration and utilization of the underground traffic engineering construction waste, wherein the preparation raw materials of the regenerated brick comprise, by mass, 50% -60% of tunneling slag soil, 28% -40% of temporary support concrete beam column reclaimed sand during cutting and dismantling, 8% -15% of waste mortar water for preparing the temporary support concrete beam column reclaimed sand during cutting and dismantling, the service time of the temporary support concrete beam column before cutting and dismantling is less than or equal to 1 year, and the regenerated brick is obtained by mixing the raw materials and performing solar maintenance after screw extrusion molding; the invention utilizes the viscoplasticity of clay minerals in the dregs; on the other hand, the mechanical property and the potential gelation property of the short-term service concrete are fully exerted, so that the waste recycled bricks in the whole underground traffic engineering construction site can be obtained on the premise of not using cement, lime, natural aggregate and fresh mixing water.
Description
Technical Field
The invention belongs to the technical field of recycling of waste in underground traffic engineering construction, and particularly relates to a waste recycled brick in an underground traffic engineering construction site and a preparation method thereof.
Background
The urban underground traffic engineering construction process comprises the following steps: the method comprises the steps of (1) carrying out open/hidden excavation and tunneling on tunnels, channels and the like, and constructing temporary support concrete enclosure structures including temporary support concrete beams, columns, retaining walls and the like in open/hidden construction spaces in order to ensure the excavation/tunneling progress, the safety of constructors, the arrangement of construction machinery and reduce the influence on the passing of surrounding people and vehicles. And after the excavation, the tunneling and the auxiliary engineering are completed, cutting and dismantling the temporary support concrete enclosure structure, and carrying out permanent support enclosure structure construction, other main body structure construction and auxiliary engineering construction. The two links of the maximum waste discharge in the urban underground traffic engineering construction are formed by excavation and tunneling and cutting and dismantling of the temporary support concrete surrounding structure.
In the process of excavation and tunneling, a large amount of dregs are generated, for conventional ground traffic engineering, the dregs are mainly stabilized and backfilled into the roadbed, but the backfill amount of the foundation of the underground traffic engineering is small, and most of tunneling dregs are required to be treated by outward transportation. The temporary support enclosure structure adopts a reinforced concrete structure, and the strength grade of the concrete is the same as or similar to that of the permanent support enclosure structure; in the formal construction process of the engineering main body structure, the temporary support enclosure structure needs to be cut and removed in steps in advance, and after the separated steel bars are roughly broken on the site of the cut and removed reinforced concrete, the rest inorganic nonmetallic waste is processed into recycled sand aggregate according to the general construction waste outward transportation treatment or the outward transportation processing field. At present, the production process of the waste concrete recycled aggregate is mainly divided into two types, namely a dry method and a wet method: the dust emission of the dry process is serious, and the powder content of the recycled coarse and fine aggregates of the waste concrete is high, so that the subsequent utilization is affected; the wet process can remove dust and fall dust, and can wash out fine powder in the recycled coarse and fine aggregate, and the processing site environment is good and the recycled aggregate performance is good. Urban underground traffic engineering is mostly located in urban areas, temporary support maintenance structure waste concrete processing sites are also located nearby construction sites, and wet process is mostly selected for temporary support concrete regeneration processing from the aspects of dust reduction and the like. However, the water consumption of the wet process is high, and the amount of waste slurry produced is also large. At present, the waste slurry water for processing the recycled aggregate is mostly subjected to solid-liquid separation by adopting sedimentation, flocculation and filter pressing separation processes, water is recycled, and filter pressing sludge is transported and buried outside.
In fact, the slag soil is mixed into shale, and sintered bricks/blocks can be prepared, but the industries of sintered products such as brick and tile blocks and the like have high energy consumption, large pollution and high CO2 emission, and are inconsistent with the green low-carbon development direction of the industries. The clay mineral in the tunneling slag is higher, and after auxiliary materials are matched, cementing materials such as cement, lime and the like or exciting agents are mixed, baking-free bricks/building blocks can be prepared, but the problems of high dosage of the cementing materials and the exciting agents and high cost are commonly caused in the products, and the economic benefit is insufficient for supporting production and use.
In view of the above, it is necessary to design a resource product of urban underground traffic engineering construction site waste and a preparation method thereof, wherein the resource product comprises the waste such as excavation residue, cutting and dismantling of recycled materials of temporary support concrete enclosure structures, waste slurry in the processing process of recycled materials and the like, and the resource product can be fully utilized.
Disclosure of Invention
In order to overcome the problems in the background technology, the invention provides a waste regenerated brick for the construction site of the whole underground traffic engineering and a preparation method thereof, and the viscoplasticity of clay minerals in the dregs is utilized; on the other hand, the mechanical property and the potential gelation property of the short-term service concrete are fully exerted, so that the waste recycled bricks in the whole underground traffic engineering construction site can be obtained on the premise of not using cement, lime, natural aggregate and fresh mixing water.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the waste regeneration brick for the construction site of the whole underground traffic engineering comprises the following preparation raw materials in percentage by mass: 50-60% of tunneling dregs, 28-40% of temporary support concrete beam column reclaimed sand is cut and removed, and 8-15% of waste slurry water for producing sand from the temporary support concrete beam column reclaimed sand is cut and removed; the tunneling slag soil is generated by open excavation or underground excavation of a tunneling machine/a shield machine, the granularity of the tunneling slag soil is smaller than 2mm, and the water content is 8-12%; the service time of the temporary support concrete beam column before concrete cutting and dismantling is less than or equal to 1 year.
Further, the temporary support concrete beam column reclaimed sand takes a concrete block cut and removed by the temporary support concrete beam column on an engineering site as a raw material, the steel is crushed and recycled, then the reclaimed sand is prepared by adopting a wet sand preparation process, the water content of the reclaimed sand is 4-6%, and the physical and chemical indexes meet the requirements of 1-grade region and class II reclaimed sand specified in GB/T25176 reclaimed fine aggregate for concrete and mortar.
Further, the temporary support concrete beam column reclaimed sand pulping waste slurry is the sand washing waste slurry discharged in the process of preparing reclaimed sand by adopting a wet method sand preparation process after cutting and demolishing concrete blocks on an engineering site to recycle steel, the waste slurry enters a water collecting tank to be collected, the waste slurry is pumped into a stirring tank by a slurry pump, and the stirring and the concentration are carried out so that the solid content of the waste slurry is 10-20%, the fineness of solid particles in the waste slurry is less than or equal to 0.15 and mm, and the fineness of solid particles in the waste slurry is more than 90% and less than or equal to 0.075 and mm.
The preparation method of the waste regenerated brick for the whole underground traffic engineering construction site comprises the following steps:
s1, respectively metering driving slag soil, reclaimed sand and waste slurry;
s2, adding the materials into a vacuum pug mill for mixing and stirring to obtain a mixture;
s3, inputting the mixture into a spiral extrusion molding machine for extrusion molding;
s4, directly cutting the extrusion molding block on line into a green body;
and S5, stacking the green bricks, and curing in a solar curing room to obtain the waste regenerated bricks on the construction site of the whole underground traffic engineering.
Further, the curing temperature in the step S5 is 30-50 ℃, and the curing time is more than 28d.
The invention has the beneficial effects that:
compared with common waste concrete, the temporary support enclosing structure has higher content of unhydrated cement particles and hydration product Ca (OH) 2 in the cut and removed concrete, has hydration performance after being ground, can play a role similar to cement and lime, and can be used as a cementing stabilizer of dregs waste.
The temporary support enclosure structure is utilized to cut and demolish the waste concrete, so that the service time is short, a large amount of unhydrated cement particles and hydration product Ca (OH) 2 exist, the potential gelatinization and lime excitation effects are achieved, and the efficiency can be exerted only by further grinding. In the wet method sand making process of the waste concrete reclaimed sand by cutting and dismantling the temporary support enclosure structure, fine particles less than or equal to 0.15mm (the particle size of most fine particles is less than or equal to 0.075 and mm) enter the waste slurry, the particle fineness of the waste slurry is close to that of lime or cement particles, that is, the waste slurry can be directly used as cement slurry and lime slurry without further grinding.
The unhydrated cement particles in the waste slurry are continuously hydrated in the maintenance process of the regenerated bricks, and the hydration products of the unhydrated cement particles and Ca (OH) 2 which is the original cement hydration product in the slurry can react with active SiO2 and Al2O3 in the tunneling slag soil to form a gelatinization system. Therefore, the invention does not need to further mix cement, lime or other external mixing modification materials such as exciting agent, and the regenerated brick can still be cemented and hardened to form higher strength, thereby leading the raw materials of the regenerated brick to be all wastes, saving raw materials and cost and protecting the environment.
The reclaimed sand is from the temporary support maintenance structure to cut and remove the waste concrete, unhydrated cement particles and hydration product Ca (OH) 2 exist, and the unhydrated cement particles and the hydration product Ca (OH) 2 are partially exposed in the crushing sand making process, so that the surfaces of the reclaimed sand particles have gelling activity and activity excitation effect; the surface of the reclaimed sand particles is contacted with the muck, and pozzolanic reaction can also occur, so that the interface effect of the reclaimed sand particles and the muck is stronger, the interface transition area is enhanced, and the interface bonding strength is improved.
The recycled bricks are all originally from urban underground traffic engineering construction site waste, including tunneling slag soil, waste concrete and waste slurry, and fully embody the in-situ digestion and in-situ utilization concepts of the engineering construction waste. In particular, the comprehensive utilization rate of the waste slurry processed by the tunneling slag soil and the recycled aggregate is extremely low at present, and the invention provides a new way with simplicity, easy implementation and low cost for the utilization of two wastes.
The regenerated brick composition is close to the soil composition, strong alkaline materials such as cement, lime and exciting agent are not used, the compatibility of other surrounding environments is better, and the regenerated brick can be used as slope protection pavement, ecological retaining wall and the like, and can be reused only in engineering construction sites, so that the construction cost is saved.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more apparent, the technical solutions of the present invention will be described in detail below, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, those skilled in the art may obtain other embodiments without making any creative effort, which fall within the protection scope of the present invention.
Example 1
A full underground traffic engineering construction site waste recycling tile comprising: according to the mass percentage, 50% of tunneling dregs, 40% of cutting and dismantling temporary support concrete beam column reclaimed sand and 10% of cutting and dismantling temporary support concrete beam column reclaimed sand pulping waste slurry.
The tunneling slag soil is produced by open excavation or underground excavation of a tunneling machine/a shield machine, the produced slag soil is paved on the surface of a blank after large particles are screened out by a 2mm sieve, and the slag soil is naturally aired until the natural water content is about 10%; the temporary support concrete beam column reclaimed sand takes a concrete block cut and removed by the temporary support concrete beam column on an engineering site as a raw material, the steel is crushed and recycled, then the reclaimed sand is prepared by adopting a wet method sand preparation process, the water content of the reclaimed sand is about 5% after the reclaimed sand is piled up, and other physical and chemical indexes meet the requirements of 1-grade distribution area and class II reclaimed sand specified in GB/T25176 reclaimed fine aggregate for concrete and mortar; the method comprises the steps of temporarily supporting concrete beam column reclaimed sand to prepare sand waste slurry, cutting and demolishing concrete blocks on an engineering site to recover steel, then adopting a wet method sand preparation process to prepare sand washing waste slurry discharged in the reclaimed sand process, enabling the waste slurry to enter a water collecting tank to be collected, pumping the waste slurry into a stirring tank by a slurry pump, stirring and concentrating to ensure that the solid content of the waste slurry is 20%, the fineness of solid particles in the waste slurry is less than or equal to 0.15 and mm, and the fineness of solid particles in the waste slurry is more than 90% and less than or equal to 0.075 and mm; and (3) temporarily supporting the concrete strength grade C30 of the concrete beam column, and cutting and dismantling the service time for 10 months before.
The preparation method of the waste regenerated brick for the whole underground traffic engineering construction site comprises the following steps:
respectively metering tunneling slag soil, regenerated sand and waste slurry;
adding the materials into a vacuum pugging machine for mixing and stirring to obtain a mixture;
inputting the mixture into a spiral extrusion molding machine for extrusion molding; the extruded block was cut directly in-line into green bodies of 240 mm ×115mm×53mm dimensions.
Stacking green bricks, curing in a solar curing room, and curing at 30-50 ℃.
And (3) maintaining the recycled bricks for 7d: compressive strength 1.63MPa; curing 28d: the compressive strength is 3.91MPa, and the flexural strength is 1.62MPa.
Comparative example 1
A full underground traffic engineering construction site waste recycling tile comprising: according to the mass percentage, 40% of tunneling slag soil, 10% of dry cement powder, 40% of cutting demolition temporary support concrete beam column reclaimed sand and 10% of cutting demolition temporary support concrete beam column reclaimed sand pulping waste slurry.
The tunneling slag soil is generated by open excavation or underground excavation of a tunneling machine/a shield machine, the generated slag soil is sieved by a sieve with 2mm to remove large particles and then is paved on the surface of a space, and the slag soil is naturally aired until the natural water content is about 12.5%; the temporary support concrete beam column reclaimed sand takes a concrete block cut and removed by the temporary support concrete beam column on an engineering site as a raw material, the steel is crushed and recycled, then the reclaimed sand is prepared by adopting a wet method sand preparation process, the water content of the reclaimed sand is about 5% after the reclaimed sand is piled up, and other physical and chemical indexes meet the requirements of 1-grade distribution area and class II reclaimed sand specified in GB/T25176 reclaimed fine aggregate for concrete and mortar; the method comprises the steps of temporarily supporting concrete beam column reclaimed sand to prepare sand waste slurry, cutting and demolishing concrete blocks on an engineering site to recover steel, then adopting a wet method sand preparation process to prepare sand washing waste slurry discharged in the reclaimed sand process, enabling the waste slurry to enter a water collecting tank to be collected, pumping the waste slurry into a stirring tank by a slurry pump, stirring and concentrating to ensure that the solid content of the waste slurry is 20%, the fineness of solid particles in the waste slurry is less than or equal to 0.15 and mm, and the fineness of solid particles in the waste slurry is more than 90% and less than or equal to 0.075 and mm; and (3) temporarily supporting the concrete strength grade C30 of the concrete beam column, and cutting and dismantling the service time for 10 months before.
The preparation method of the waste regenerated brick for the whole underground traffic engineering construction site comprises the following steps:
respectively metering tunneling slag soil, regenerated sand and waste slurry;
adding the materials into a vacuum pugging machine for mixing and stirring to obtain a mixture;
inputting the mixture into a spiral extrusion molding machine for extrusion molding; the extruded block was cut directly in-line into green bodies of 240 mm ×115mm×53mm dimensions.
Stacking green bricks, curing in a solar curing room, and curing at 30-50 ℃.
And (3) maintaining the recycled bricks for 7d: compressive strength 1.82MPa; curing 28d: the compressive strength is 4.21MPa, and the flexural strength is 1.02MPa.
Half of the tunneling slag is replaced by cement, and the compressive strength of the finally manufactured recycled bricks is obviously reduced although the compressive strength is increased.
Example 2
A full underground traffic engineering construction site waste recycling tile comprising: according to the mass percentage, 50% of tunneling dregs, 38% of cutting demolition temporary support concrete beam column reclaimed sand and 12% of cutting demolition temporary support concrete beam column reclaimed sand pulping waste slurry.
The tunneling slag soil is produced by open excavation or underground excavation of a tunneling machine/a shield machine, the produced slag soil is paved on the surface of a blank after large particles are screened out by a 2mm sieve, and the slag soil is naturally aired until the natural water content is about 10%; the temporary support concrete beam column reclaimed sand takes a concrete block cut and removed by the temporary support concrete beam column on an engineering site as a raw material, the steel is crushed and recycled, then the reclaimed sand is prepared by adopting a wet method sand preparation process, the water content of the reclaimed sand is about 5% after the reclaimed sand is piled up, and other physical and chemical indexes meet the requirements of 1-grade distribution area and class II reclaimed sand specified in GB/T25176 reclaimed fine aggregate for concrete and mortar; the method comprises the steps of temporarily supporting concrete beam column reclaimed sand to prepare sand waste slurry, cutting and demolishing concrete blocks on an engineering site to recover steel, then adopting a wet method sand preparation process to prepare sand washing waste slurry discharged in the reclaimed sand process, enabling the waste slurry to enter a water collecting tank to be collected, pumping the waste slurry into a stirring tank by a slurry pump, stirring and concentrating to ensure that the solid content of the waste slurry is 20%, the fineness of solid particles in the waste slurry is less than or equal to 0.15 and mm, and the fineness of solid particles in the waste slurry is more than 90% and less than or equal to 0.075 and mm; and (3) temporarily supporting the concrete strength grade C30 of the concrete beam column, and cutting and dismantling the service time for 10 months before.
The preparation method of the waste regenerated brick for the whole underground traffic engineering construction site comprises the following steps:
respectively metering tunneling slag soil, regenerated sand and waste slurry;
adding the materials into a vacuum pugging machine for mixing and stirring to obtain a mixture;
inputting the mixture into a spiral extrusion molding machine for extrusion molding; directly cutting the extrusion molding block into green bodies with the dimensions of 240 mm multiplied by 115mm multiplied by 53mm on line;
stacking green bricks and curing in a solar curing room.
The compressive strength of the recycled bricks after curing for 7 days is 2.07MPa, and the compressive strength of the recycled bricks after curing for 28 days is 4.46MPa.
Example 3
A full underground traffic engineering construction site waste recycling tile comprising: according to the mass percentage, 55% of tunneling dregs, 32% of cutting demolition temporary support concrete beam column reclaimed sand and 13% of cutting demolition temporary support concrete beam column reclaimed sand pulping waste slurry.
The tunneling slag soil is produced by open excavation or underground excavation of a tunneling machine/a shield machine, the produced slag soil is paved on the surface of a blank after large particles are screened out by a 2mm sieve, and the slag soil is naturally aired until the natural water content is about 10%; the temporary support concrete beam column reclaimed sand takes a concrete block cut and removed by the temporary support concrete beam column on an engineering site as a raw material, the steel is crushed and recycled, then the reclaimed sand is prepared by adopting a wet method sand preparation process, the water content of the reclaimed sand is about 5% after the reclaimed sand is piled up, and other physical and chemical indexes meet the requirements of 1-grade distribution area and class II reclaimed sand specified in GB/T25176 reclaimed fine aggregate for concrete and mortar; the method comprises the steps of temporarily supporting concrete beam column reclaimed sand to prepare sand waste slurry, cutting and demolishing concrete blocks on an engineering site to recover steel, then adopting a wet method sand preparation process to prepare sand washing waste slurry discharged in the reclaimed sand process, enabling the waste slurry to enter a water collecting tank to be collected, pumping the waste slurry into a stirring tank by a slurry pump, stirring and concentrating to ensure that the solid content of the waste slurry is 20%, the fineness of solid particles in the waste slurry is less than or equal to 0.15 and mm, and the fineness of solid particles in the waste slurry is more than 90% and less than or equal to 0.075 and mm; and (3) temporarily supporting the concrete strength grade C30 of the concrete beam column, and cutting and dismantling the service time for 6 months before.
The preparation method of the waste regenerated brick for the whole underground traffic engineering construction site comprises the following steps:
respectively metering tunneling slag soil, regenerated sand and waste slurry;
adding the materials into a vacuum pugging machine for mixing and stirring to obtain a mixture;
inputting the mixture into a spiral extrusion molding machine for extrusion molding; directly cutting the extrusion molding block into green bodies with the dimensions of 240 mm multiplied by 115mm multiplied by 53mm on line;
stacking green bricks and curing in a solar curing room.
The compressive strength of the recycled bricks after curing for 7 days is 1.85MPa, and the compressive strength of the recycled bricks after curing for 28 days is 4.15MPa.
Example 4
A full underground traffic engineering construction site waste recycling tile comprising: according to the mass percentage, 55% of tunneling dregs, 30% of cutting and dismantling temporary support concrete beam column reclaimed sand and 15% of cutting and dismantling temporary support concrete beam column reclaimed sand production waste slurry water.
The tunneling slag soil is produced by open excavation or underground excavation of a tunneling machine/a shield machine, the produced slag soil is paved on the surface of a blank after large particles are screened out by a 2mm sieve, and the slag soil is naturally aired until the natural water content is about 10%; the temporary support concrete beam column reclaimed sand takes a concrete block cut and removed by the temporary support concrete beam column on an engineering site as a raw material, the steel is crushed and recycled, then the reclaimed sand is prepared by adopting a wet method sand preparation process, the water content of the reclaimed sand is about 5% after the reclaimed sand is piled up, and other physical and chemical indexes meet the requirements of 1-grade distribution area and class II reclaimed sand specified in GB/T25176 reclaimed fine aggregate for concrete and mortar; the method comprises the steps of temporarily supporting concrete beam column reclaimed sand to prepare sand waste slurry, cutting and demolishing concrete blocks on an engineering site to recover steel, then adopting a wet method sand preparation process to prepare sand washing waste slurry discharged in the reclaimed sand process, enabling the waste slurry to enter a water collecting tank to be collected, pumping the waste slurry into a stirring tank by a slurry pump, stirring and concentrating to ensure that the solid content of the waste slurry is 20%, the fineness of solid particles in the waste slurry is less than or equal to 0.15 and mm, and the fineness of solid particles in the waste slurry is more than 90% and less than or equal to 0.075 and mm; and (3) temporarily supporting the concrete strength grade C30 of the concrete beam column, and cutting and dismantling the service time for 2 months before.
The preparation method of the waste regenerated brick for the whole underground traffic engineering construction site comprises the following steps:
respectively metering tunneling slag soil, regenerated sand and waste slurry;
adding the materials into a vacuum pugging machine for mixing and stirring to obtain a mixture;
inputting the mixture into a spiral extrusion molding machine for extrusion molding; directly cutting the extrusion molding block into green bodies with the dimensions of 240 mm multiplied by 115mm multiplied by 53mm on line;
stacking green bricks and curing in a solar curing room.
The compressive strength of the recycled bricks after curing for 7 days is 1.71 MPa, and the compressive strength of the recycled bricks after curing for 28 days is 3.97MPa.
Example 5
A full underground traffic engineering construction site waste recycling tile comprising: 60% of tunneling dregs, 30% of cutting demolition temporary support concrete beam column reclaimed sand and 10% of cutting demolition temporary support concrete beam column reclaimed sand pulping waste slurry.
The tunneling slag soil is produced by open excavation or underground excavation of a tunneling machine/a shield machine, the produced slag soil is paved on the surface of a blank after large particles are screened out by a 2mm sieve, and the slag soil is naturally aired until the natural water content is about 10%; the temporary support concrete beam column reclaimed sand takes a concrete block cut and removed by the temporary support concrete beam column on an engineering site as a raw material, the steel is crushed and recycled, then the reclaimed sand is prepared by adopting a wet method sand preparation process, the water content of the reclaimed sand is about 5% after the reclaimed sand is piled up, and other physical and chemical indexes meet the requirements of 1-grade distribution area and class II reclaimed sand specified in GB/T25176 reclaimed fine aggregate for concrete and mortar; the method comprises the steps of temporarily supporting concrete beam column reclaimed sand to prepare sand waste slurry, cutting and demolishing concrete blocks on an engineering site to recover steel, then adopting a wet method sand preparation process to prepare sand washing waste slurry discharged in the reclaimed sand process, enabling the waste slurry to enter a water collecting tank to be collected, pumping the waste slurry into a stirring tank by a slurry pump, stirring and concentrating to ensure that the solid content of the waste slurry is 20%, the fineness of solid particles in the waste slurry is less than or equal to 0.15 and mm, and the fineness of solid particles in the waste slurry is more than 90% and less than or equal to 0.075 and mm; and (3) temporarily supporting the concrete strength grade C30 of the concrete beam column, and cutting and dismantling the service time for 6 months before.
The preparation method of the waste regenerated brick for the whole underground traffic engineering construction site comprises the following steps:
respectively metering tunneling slag soil, regenerated sand and waste slurry;
adding the materials into a vacuum pugging machine for mixing and stirring to obtain a mixture;
inputting the mixture into a spiral extrusion molding machine for extrusion molding; directly cutting the extrusion molding block into green bodies with the dimensions of 240 mm multiplied by 115mm multiplied by 53mm on line;
stacking green bricks and curing in a solar curing room.
The compressive strength of the recycled bricks after curing for 7 days is 2.09 MPa, and the compressive strength of the recycled bricks after curing for 28 days is 4.64MPa.
Comparative example 5
A full underground traffic engineering construction site waste recycling tile comprising: 60% of tunneling dregs, 30% of cutting demolition temporary support concrete beam column reclaimed sand and 10% of cutting demolition temporary support concrete beam column reclaimed sand pulping waste slurry.
The tunneling slag soil is produced by open excavation or underground excavation of a tunneling machine/a shield machine, the produced slag soil is paved on the surface of a blank after large particles are screened out by a 2mm sieve, and the slag soil is naturally aired until the natural water content is about 10%; the temporary support concrete beam column reclaimed sand takes a concrete block cut and removed by the temporary support concrete beam column on an engineering site as a raw material, the steel is crushed and recycled, then the reclaimed sand is prepared by adopting a wet method sand preparation process, the water content of the reclaimed sand is about 5% after the reclaimed sand is piled up, and other physical and chemical indexes meet the requirements of 1-grade distribution area and class II reclaimed sand specified in GB/T25176 reclaimed fine aggregate for concrete and mortar; the method comprises the steps of temporarily supporting concrete beam column reclaimed sand to prepare sand waste slurry, cutting and demolishing concrete blocks on an engineering site to recover steel, then adopting a wet method sand preparation process to prepare sand washing waste slurry discharged in the reclaimed sand process, enabling the waste slurry to enter a water collecting tank to be collected, pumping the waste slurry into a stirring tank by a slurry pump, stirring and concentrating to enable the solid content of the waste slurry to be 10%, wherein the fineness of solid particles in the waste slurry is less than or equal to 0.15mm, and the fineness of solid particles in the waste slurry is more than 90% and less than or equal to 0.075 mm; and (3) temporarily supporting the concrete strength grade C30 of the concrete beam column, and cutting and dismantling the service time for 6 months before.
The preparation method of the waste regenerated brick for the whole underground traffic engineering construction site comprises the following steps:
respectively metering tunneling slag soil, regenerated sand and waste slurry;
adding the materials into a vacuum pugging machine for mixing and stirring to obtain a mixture;
inputting the mixture into a spiral extrusion molding machine for extrusion molding; directly cutting the extrusion molding block into green bodies with the dimensions of 240 mm multiplied by 115mm multiplied by 53mm on line;
stacking green bricks and curing in a solar curing room.
The compressive strength of the recycled bricks after curing for 7 days is 1.59 MPa, and the compressive strength of the recycled bricks after curing for 28 days is 3.64MPa.
In the invention, the total water content of the mixed materials is controlled between 15-17%, and when the water content exceeds 19%, the compressive strength of the prepared regenerated brick can be obviously reduced.
Example 6
A full underground traffic engineering construction site waste recycling tile comprising: 60% of tunneling dregs, 28% of cutting demolition temporary support concrete beam column reclaimed sand and 12% of cutting demolition temporary support concrete beam column reclaimed sand pulping waste slurry.
The tunneling slag soil is produced by open excavation or underground excavation of a tunneling machine/a shield machine, the produced slag soil is paved on the surface of a blank after large particles are screened out by a 2mm sieve, and the slag soil is naturally aired until the natural water content is about 10%; the temporary support concrete beam column reclaimed sand takes a concrete block cut and removed by the temporary support concrete beam column on an engineering site as a raw material, the steel is crushed and recycled, then the reclaimed sand is prepared by adopting a wet method sand preparation process, the water content of the reclaimed sand is about 5% after the reclaimed sand is piled up, and other physical and chemical indexes meet the requirements of 1-grade distribution area and class II reclaimed sand specified in GB/T25176 reclaimed fine aggregate for concrete and mortar; the method comprises the steps of temporarily supporting concrete beam column reclaimed sand to prepare sand waste slurry, cutting and demolishing concrete blocks on an engineering site to recover steel, then adopting a wet method sand preparation process to prepare sand washing waste slurry discharged in the reclaimed sand process, enabling the waste slurry to enter a water collecting tank to be collected, pumping the waste slurry into a stirring tank by a slurry pump, stirring and concentrating to enable the solid content of the waste slurry to be 15%, wherein the fineness of solid particles in the waste slurry is less than or equal to 0.15mm, and the fineness of solid particles in the waste slurry is more than 90% and less than or equal to 0.075 mm; and (3) temporarily supporting the concrete strength grade C30 of the concrete beam column, and cutting and dismantling the service time for 8 months before.
The preparation method of the waste regenerated brick for the whole underground traffic engineering construction site comprises the following steps:
respectively metering tunneling slag soil, regenerated sand and waste slurry;
adding the materials into a vacuum pugging machine for mixing and stirring to obtain a mixture;
inputting the mixture into a spiral extrusion molding machine for extrusion molding; directly cutting the extrusion molding block into green bodies with the dimensions of 240 mm multiplied by 115mm multiplied by 53mm on line;
stacking green bricks and curing in a solar curing room.
The compressive strength of the recycled bricks after curing for 7 days is 2.22 MPa, and the compressive strength of the recycled bricks after curing for 28 days is 4.82 MPa.
In conclusion, the invention provides a simple, practical, economical and feasible way for the treatment and disposal of the wastes in the urban underground traffic engineering construction site, and realizes the productization, high efficiency, low cost, preparation and application of the wastes.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. The waste recycled brick for the whole underground traffic engineering construction site is characterized in that the recycled brick is prepared from 50-60 wt% of tunneling slag soil, 28-40-wt% of temporary support concrete beam column reclaimed sand for cutting and removing and 8-15-wt% of waste mortar water for preparing sand from the temporary support concrete beam column reclaimed sand for cutting and removing; the tunneling slag soil is generated by open excavation or underground excavation of a tunneling machine/a shield machine, the granularity of the tunneling slag soil is smaller than 2mm, and the water content is 8-12 wt%; the service time of the temporary support concrete beam column before concrete cutting and dismantling is less than or equal to 1 year.
2. The all-underground traffic engineering construction site waste recycled brick is characterized in that the temporary support concrete beam column recycled sand takes a concrete block cut and removed by the temporary support concrete beam column of an engineering site as a raw material, steel is crushed and recycled, and recycled sand is prepared by adopting a wet sand preparation process, wherein the water content of the recycled sand is 4-6%, and the physical and chemical indexes meet the requirements of 1-grade distribution area and class II middle sand specified in GB/T25176 recycled fine aggregate for concrete and mortar.
3. The waste regenerated brick for the whole underground traffic engineering construction site and the preparation method thereof according to claim 1 or 2, wherein the temporary support concrete beam column regenerated sand is sand-making waste slurry water, which is sand-washing waste slurry water discharged in the process of preparing the regenerated sand by adopting a wet sand-making process after cutting and dismantling concrete blocks of the temporary support concrete beam column in the engineering site to crush and recycle steel, the waste slurry water enters a water collecting tank to be collected, the waste slurry water is pumped into a stirring tank by a slurry pump, and the stirring and the concentration are carried out so that the solid content of the waste slurry water is 10-20%, the solid particle fineness of the waste slurry water is less than or equal to 0.15mm, and the solid particle fineness of the waste slurry water is more than 90% and less than or equal to 0.075 mm.
4. A method for producing a waste recycling tile in the construction site of an underground transportation project according to any one of claims 1 to 3, comprising the steps of:
s1, respectively metering driving slag soil, reclaimed sand and waste slurry;
s2, adding the materials into a vacuum pug mill for mixing and stirring to obtain a mixture;
s3, inputting the mixture into a spiral extrusion molding machine for extrusion molding;
s4, directly cutting the extrusion molding block on line into a green body;
and S5, stacking the green bricks, and curing in a solar curing room to obtain the waste regenerated bricks on the construction site of the whole underground traffic engineering.
5. The method of claim 4, wherein the curing temperature in step S5 is 30-50 ℃ and the curing time is more than 28d.
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| KR20000000356A (en) * | 1999-10-14 | 2000-01-15 | 김민태 | Manufacture method of regenerate sand using industrial wastes and rocks |
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