CN112694308A - Process for producing aerated concrete by using waste slurry generated by tubular pile - Google Patents
Process for producing aerated concrete by using waste slurry generated by tubular pile Download PDFInfo
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- CN112694308A CN112694308A CN202011636846.6A CN202011636846A CN112694308A CN 112694308 A CN112694308 A CN 112694308A CN 202011636846 A CN202011636846 A CN 202011636846A CN 112694308 A CN112694308 A CN 112694308A
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- 239000002002 slurry Substances 0.000 title claims abstract description 147
- 239000002699 waste material Substances 0.000 title claims abstract description 90
- 239000004567 concrete Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 50
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000004568 cement Substances 0.000 claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 238000003756 stirring Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000005086 pumping Methods 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 19
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 19
- 239000004571 lime Substances 0.000 claims description 19
- 239000004576 sand Substances 0.000 claims description 19
- 239000010440 gypsum Substances 0.000 claims description 18
- 229910052602 gypsum Inorganic materials 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 18
- 230000003068 static effect Effects 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 14
- 239000011259 mixed solution Substances 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 claims description 8
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 239000011178 precast concrete Substances 0.000 abstract description 8
- 229910000831 Steel Inorganic materials 0.000 description 24
- 239000010959 steel Substances 0.000 description 24
- 230000006835 compression Effects 0.000 description 21
- 238000007906 compression Methods 0.000 description 21
- 239000011449 brick Substances 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 239000004927 clay Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- 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
- C04B28/14—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 calcium sulfate cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a process for producing aerated concrete by using waste slurry generated by a tubular pile, which comprises the following steps: preparing a first raw material, preparing a second raw material, pumping, feeding and stirring, heating slurry, adding aluminum powder, pouring, cutting, performing autoclaved curing and storing in a plate-breaking warehouse, reducing the adding amount of cement in the aerated concrete by using waste slurry generated by producing a precast concrete pipe pile, and simultaneously ensuring that the strength and dry density of an aerated concrete product meet the requirements of national standards; the main components of the waste slurry generated in the production process of the precast concrete pipe pile are consistent with the components of part of raw materials used by the aerated concrete, so that the waste slurry can properly replace a certain amount of cement when being applied to the production of the aerated concrete on the premise of ensuring the product quality, the production cost is reduced, the secondary utilization of the waste slurry is realized, the resources are saved, and the environment is protected.
Description
Technical Field
The invention relates to the technical field of aerated concrete, in particular to a process for producing aerated concrete by using waste slurry generated by a tubular pile.
Background
The aerated concrete block is a novel wall building material, and the product has the characteristics of environmental protection, light weight, high strength utilization rate, heat preservation and insulation, sound insulation and absorption, fire prevention, flame retardance, permeability and water resistance, no radioactivity, good shock resistance, accurate size, convenient construction, economy, applicability and the like. The aerated concrete block can be used for building bearing walls of buildings with three or less floors, and can also be used as non-bearing filler wall materials of industrial factory buildings, multi-floor buildings and high-rise frame structure buildings. Compared with the traditional clay sintered brick material, the aerated concrete product has light weight and good heat preservation performance, can reduce the dead weight of the building, and the heat preservation effect of the built building is good. Meanwhile, a large amount of cultivated land is destroyed in the process of producing the clay baked brick, so that the clay baked brick is replaced by aerated concrete, the phenomena that the baked brick is dug to destroy the field can be reduced, the resource utilization of industrial solid wastes such as gypsum, tailing sand and the like is realized, and the environmental pollution is reduced. The country has banned the production of clay baked bricks, and the clay baked bricks are gradually replaced by aerated concrete products. Therefore, the aerated concrete block becomes the leading product of the building material industry, and will increasingly show higher use value and wide development prospect.
Sand, cement, lime, gypsum, aluminum powder and the like are used as main raw materials for producing the aerated concrete, and the strength of the aerated concrete is greatly influenced by the mixing amount of the cement and the lime, so that the cement and the lime must keep a certain total mixing proportion and a certain relative mixing proportion; in the production process of the precast concrete tubular pile, a centrifugal process generates a large amount of waste slurry, the main components of the waste slurry are cement suspended matters and fine materials in sand, the waste slurry can be generally hardened for about 5 hours, if the waste slurry is not recycled in time, solid waste materials can be formed, the treatment is difficult, and the environment is polluted.
Researches show that the main components of the waste slurry generated in the production process of the precast concrete pipe pile are consistent with the components of part of raw materials used by aerated concrete.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a process for producing aerated concrete by using waste slurry generated by tubular piles, wherein the waste slurry generated by producing the tubular piles is applied to the production of the aerated concrete, so that a certain amount of cement can be properly replaced on the premise of ensuring the product quality, the production cost is reduced, the secondary utilization of the waste slurry is realized, the resources are saved, and the environment is protected.
The invention provides a process for producing aerated concrete by using waste slurry generated in the production of tubular piles, which comprises the following steps:
s1: preparing a first raw material: preparing 12-14% of cement, 12-14% of lime, 47-53% of sand slurry, 14-15% of aerated concrete blank waste slurry, 3-4% of gypsum slurry, 6-9% of waste slurry generated by producing a tubular pile and 0.07-0.08% of aluminum powder;
s2: preparing a second raw material: conveying the waste slurry generated in the step S1 for producing the tubular pile into a slurry pond of an aerated concrete production line, and adding a retarder into the slurry pond;
s3: pumping: pumping waste slurry generated by the production pipe pile added with the retarder in the S2 into an independent storage tank for storage and standby;
s4: feeding and stirring: sequentially adding the sand slurry, the aerated concrete body waste slurry, the gypsum slurry, the pipe pile waste slurry, the lime and the cement into a stirrer in sequence, and stirring and mixing to form a mixture;
s5: heating the slurry: introducing water vapor into the mixture for heating, and detecting the diffusivity of the mixture in the stirrer in S4 when the temperature rises to 45 ℃;
s6: adding aluminum powder: when the diffusivity of the mixture in the stirrer in the S5 reaches 30 +/-1 cm, adding a mixed solution of aluminum powder and water which are stirred in advance into the stirrer and uniformly stirring;
s7: pouring: pouring the aerated concrete in the S6 to form a blank;
s8: cutting: placing the blank formed in the step S7 together with the die into a static chamber for curing, and cutting the blank after demoulding;
s9: steam pressure curing: putting the cut blank in the step S8 into an autoclave for autoclave curing;
s10: warehousing: and (5) taking the blank in the S9 out of the kettle, breaking off the board, packaging, inserting into a production line and warehousing.
Further, the retarder in S2 is hydroxycarboxylic acid retarder and salts thereof, and the mass of the hydroxycarboxylic acid retarder and salts thereof is 0.03-0.1% of the mass of the waste slurry generated by producing the pipe pile.
Further, the storage tank in S3 is a closed container.
Further, the diffusibility test in S5 uses a diffusibility tester.
Further, the stirring time period in S6 is at least 45 seconds.
Further, the static chamber curing in the S8 is 2-3 hours, and the autoclave curing time in the S9 is 11-12 hours.
Further, in S9, an aerated concrete panel-breaking machine is used to break the green body after the green body is taken out of the kettle.
The process for producing aerated concrete by using waste slurry generated by the tubular pile has the advantages that: the waste slurry generated by producing the precast concrete pipe pile is utilized to reduce the addition amount of cement in the aerated concrete, and simultaneously, the strength and the dry density of an aerated concrete product can be ensured to meet the requirements of national standards; the main components of the waste slurry generated in the production process of the precast concrete pipe pile are consistent with the components of part of raw materials used by the aerated concrete, so that the waste slurry can properly replace a certain amount of cement when being applied to the production of the aerated concrete on the premise of ensuring the product quality, the production cost is reduced, the secondary utilization of the waste slurry is realized, the resources are saved, and the environment is protected.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the specific embodiments. The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A process for producing aerated concrete by using waste slurry generated in the production of tubular piles comprises the following steps:
s1: preparing a first raw material: preparing 1000kg of cement, 1000kg of lime, 3846kg of sand slurry, 1115.4kg of aerated concrete blank waste slurry, 269kg of gypsum slurry, 461.5kg of waste slurry generated in the production of a tubular pile and 5.384kg of aluminum powder;
s2: preparing a second raw material: conveying the waste slurry generated in the step S1 for producing the tubular pile into a slurry pond of an aerated concrete production line, and adding 0.1385kg of retarder into the slurry pond;
s3: pumping: pumping waste slurry generated by the production pipe pile added with the retarder in the S2 into an independent storage tank for storage and standby;
s4: feeding and stirring: sequentially adding the sand slurry, the aerated concrete body waste slurry, the gypsum slurry, the pipe pile waste slurry, the lime and the cement into a stirrer in sequence, and stirring and mixing to form a mixture;
s5: heating the slurry: introducing water vapor into the mixture for heating, and testing the diffusivity of the mixture in the stirrer in S4 when the temperature rises to 45 ℃; filling the mixture into a diffusivity cylinder of a mortar diffusivity measuring instrument, trowelling the mixture along the cylinder opening by using a steel ruler, and removing the mixture around the cylinder; quickly and vertically lifting the diffusivity cylinder, gradually diffusing the mixture under the action of self weight, and measuring diameter data of the diffused mixture in different directions by using a steel ruler;
s6: adding aluminum powder: when the diffusivity of the mixture in the stirrer in S5 reaches 30cm, 5.384kg of aluminum powder and 10.768kg of water are mixed, and a mixed solution of the aluminum powder and the water which are stirred in advance is added into the stirrer and stirred for 45 seconds to be uniformly mixed;
s7: pouring: pouring the die with the aerated concrete in the S6 to form a blank;
s8: cutting: placing the blank formed in the step S7 together with the die into a static stop chamber for static stop for 2.5h, and cutting the blank by using a steel wire after demoulding;
s9: steam pressure curing: placing the blank formed in the step S8 together with a die into a room for maintenance for 11 hours, and cutting the blank by using a steel wire after demoulding;
s10: warehousing: and (4) taking the green bodies in the S9 out of the kettle by using an aerated concrete panel-severing machine, then performing panel-severing, packaging, inserting into a production line and warehousing.
The compression strength of the blank after warehousing is measured by a compression testing machinePerforming detection to obtain the compressive strength of the green body of 3.0MPa, weighing a green body by using an electronic scale, measuring the size to calculate the volume of the green body, and obtaining the dry density of the green body of 430kg/m3The compression strength and the dry density meet the requirements of national standards.
Example 2
A process for producing aerated concrete by using waste slurry generated in the production of tubular piles comprises the following steps:
s1: preparing a first raw material: preparing 1000kg of cement, 1000kg of lime, 3846kg of sand slurry, 1115.4kg of aerated concrete blank waste slurry, 269kg of gypsum slurry, 538.5kg of waste slurry generated by producing a tubular pile and 5.384kg of aluminum powder;
s2: preparing a second raw material: conveying the waste slurry generated in the step S1 for producing the tubular pile into a slurry pond of an aerated concrete production line, and adding 0.1385kg of retarder into the slurry pond;
s3: pumping: pumping waste slurry generated by the production pipe pile added with the retarder in the S2 into an independent storage tank for storage and standby;
s4: feeding and stirring: sequentially adding the sand slurry, the aerated concrete body waste slurry, the gypsum slurry, the pipe pile waste slurry, the lime and the cement into a stirrer in sequence, and stirring and mixing to form a mixture;
s5: heating the slurry: introducing water vapor into the mixture for heating, and testing the diffusivity of the mixture in the stirrer in S4 when the temperature rises to 45 ℃; filling the mixture into a diffusivity cylinder of a mortar diffusivity measuring instrument, trowelling the mixture along the cylinder opening by using a steel ruler, and removing the mixture around the cylinder; quickly and vertically lifting the diffusivity cylinder, gradually diffusing the mixture under the action of self weight, and measuring diameter data of the diffused mixture in different directions by using a steel ruler;
s6: adding aluminum powder: when the diffusivity of the mixture in the stirrer in S5 reaches 30cm, 5.384kg of aluminum powder and 10.768kg of water are mixed, and a mixed solution of the aluminum powder and the water which are stirred in advance is added into the stirrer and stirred for 45 seconds to be uniformly mixed;
s7: pouring: pouring the die with the aerated concrete in the S6 to form a blank;
s8: cutting: placing the blank formed in the step S7 together with the die into a static stop chamber for static stop for 2.5h, and cutting the blank by using a steel wire after demoulding;
s9: steam pressure curing: placing the blank formed in the step S8 together with a die into a room for maintenance for 11 hours, and cutting the blank by using a steel wire after demoulding;
s10: warehousing: and (4) taking the green bodies in the S9 out of the kettle by using an aerated concrete panel-severing machine, then performing panel-severing, packaging, inserting into a production line and warehousing.
Detecting the compression strength of the blank after warehousing by using a compression testing machine to obtain that the compression strength of the blank is 3.1MPa, weighing one blank by using an electronic scale, measuring the size and calculating the volume to obtain that the dry density of the blank is 435kg/m3The compression strength and the dry density meet the requirements of national standards.
Example 3
A process for producing aerated concrete by using waste slurry generated in the production of tubular piles comprises the following steps:
s1: preparing a first raw material: preparing 1000kg of cement, 1000kg of lime, 3846kg of sand slurry, 1115.4kg of aerated concrete blank waste slurry, 269kg of gypsum slurry, 615.4kg of waste slurry generated in the production of a tubular pile and 5.384kg of aluminum powder;
s2: preparing a second raw material: conveying the waste slurry generated in the step S1 for producing the tubular pile into a slurry pond of an aerated concrete production line, and adding 0.1385kg of retarder into the slurry pond;
s3: pumping: pumping waste slurry generated by the production pipe pile added with the retarder in the S2 into an independent storage tank for storage and standby;
s4: feeding and stirring: sequentially adding the sand slurry, the aerated concrete body waste slurry, the gypsum slurry, the pipe pile waste slurry, the lime and the cement into a stirrer in sequence, and stirring and mixing to form a mixture;
s5: heating the slurry: introducing water vapor into the mixture for heating, and testing the diffusivity of the mixture in the stirrer in S4 when the temperature rises to 45 ℃; filling the mixture into a diffusivity cylinder of a mortar diffusivity measuring instrument, trowelling the mixture along the cylinder opening by using a steel ruler, and removing the mixture around the cylinder; quickly and vertically lifting the diffusivity cylinder, gradually diffusing the mixture under the action of self weight, and measuring diameter data of the diffused mixture in different directions by using a steel ruler;
s6: adding aluminum powder: when the diffusivity of the mixture in the stirrer in S5 reaches 30cm, 5.384kg of aluminum powder and 10.768kg of water are mixed, and a mixed solution of the aluminum powder and the water which are stirred in advance is added into the stirrer and stirred for 45 seconds to be uniformly mixed;
s7: pouring: pouring the die with the aerated concrete in the S6 to form a blank;
s8: cutting: placing the blank formed in the step S7 together with the die into a static stop chamber for static stop for 2.5h, and cutting the blank by using a steel wire after demoulding;
s9: steam pressure curing: placing the blank formed in the step S8 together with a die into a room for maintenance for 11 hours, and cutting the blank by using a steel wire after demoulding;
s10: warehousing: and (4) taking the green bodies in the S9 out of the kettle by using an aerated concrete panel-severing machine, then performing panel-severing, packaging, inserting into a production line and warehousing.
Detecting the compressive strength of the blank after warehousing by using a compression testing machine to obtain that the compressive strength of the blank is 3.2MPa, weighing one blank by using an electronic scale, measuring the size and calculating the volume to obtain that the dry density of the blank is 451kg/m3The compression strength and the dry density meet the requirements of national standards.
Example 4
A process for producing aerated concrete by using waste slurry generated in the production of tubular piles comprises the following steps:
s1: preparing a first raw material: preparing 1000kg of cement, 1000kg of lime, 3846kg of sand slurry, 1115.4kg of aerated concrete blank waste slurry, 269kg of gypsum slurry, 692.3kg of waste slurry generated in the production of a tubular pile and 5.384kg of aluminum powder;
s2: preparing a second raw material: conveying the waste slurry generated in the step S1 for producing the tubular pile into a slurry pond of an aerated concrete production line, and adding 0.1385kg of retarder into the slurry pond;
s3: pumping: pumping waste slurry generated by the production pipe pile added with the retarder in the S2 into an independent storage tank for storage and standby;
s4: feeding and stirring: sequentially adding the sand slurry, the aerated concrete body waste slurry, the gypsum slurry, the pipe pile waste slurry, the lime and the cement into a stirrer in sequence, and stirring and mixing to form a mixture;
s5: heating the slurry: introducing water vapor into the mixture for heating, and testing the diffusivity of the mixture in the stirrer in S4 when the temperature rises to 45 ℃; filling the mixture into a diffusivity cylinder of a mortar diffusivity measuring instrument, trowelling the mixture along the cylinder opening by using a steel ruler, and removing the mixture around the cylinder; quickly and vertically lifting the diffusivity cylinder, gradually diffusing the mixture under the action of self weight, and measuring diameter data of the diffused mixture in different directions by using a steel ruler;
s6: adding aluminum powder: when the diffusivity of the mixture in the stirrer in S5 reaches 30cm, 5.384kg of aluminum powder and 10.768kg of water are mixed, and a mixed solution of the aluminum powder and the water which are stirred in advance is added into the stirrer and stirred for 45 seconds to be uniformly mixed;
s7: pouring: pouring the die with the aerated concrete in the S6 to form a blank;
s8: cutting: placing the blank formed in the step S7 together with the die into a static stop chamber for static stop for 2.5h, and cutting the blank by using a steel wire after demoulding;
s9: steam pressure curing: placing the blank formed in the step S8 together with a die into a room for maintenance for 11 hours, and cutting the blank by using a steel wire after demoulding;
s10: warehousing: and (4) taking the green bodies in the S9 out of the kettle by using an aerated concrete panel-severing machine, then performing panel-severing, packaging, inserting into a production line and warehousing.
Detecting the compression strength of the blank after warehousing by using a compression testing machine to obtain that the compression strength of the blank is 3.3MPa, weighing one blank by using an electronic scale, measuring the size and calculating the volume to obtain that the dry density of the blank is 463kg/m3The compression strength and the dry density meet the requirements of national standards.
Example 5
S1: preparing a first raw material: preparing 1000kg of cement, 1000kg of lime, 3846kg of sand slurry, 1115.4kg of aerated concrete blank waste slurry, 269kg of gypsum slurry, 461.5kg of waste slurry generated in the production of a tubular pile and 5.769kg of aluminum powder;
s2: preparing a second raw material: conveying the waste slurry generated in the step S1 for producing the tubular pile into a slurry pond of an aerated concrete production line, and adding 0.1385kg of retarder into the slurry pond;
s3: pumping: pumping waste slurry generated by the production pipe pile added with the retarder in the S2 into an independent storage tank for storage and standby;
s4: feeding and stirring: sequentially adding the sand slurry, the aerated concrete body waste slurry, the gypsum slurry, the pipe pile waste slurry, the lime and the cement into a stirrer in sequence, and stirring and mixing to form a mixture;
s5: heating the slurry: introducing water vapor into the mixture for heating, and testing the diffusivity of the mixture in the stirrer in S4 when the temperature rises to 45 ℃; filling the mixture into a diffusivity cylinder of a mortar diffusivity measuring instrument, trowelling the mixture along the cylinder opening by using a steel ruler, and removing the mixture around the cylinder; quickly and vertically lifting the diffusivity cylinder, gradually diffusing the mixture under the action of self weight, and measuring diameter data of the diffused mixture in different directions by using a steel ruler;
s6: adding aluminum powder: when the diffusivity of the mixture in the stirrer in S5 reaches 30cm, 5.769kg of aluminum powder and 10.768kg of water are mixed, and a mixed solution of the aluminum powder and the water which are stirred in advance is added into the stirrer and stirred for 45 seconds to be uniformly mixed;
s7: pouring: pouring the die with the aerated concrete in the S6 to form a blank;
s8: cutting: placing the blank formed in the step S7 together with the die into a static stop chamber for static stop for 2.5h, and cutting the blank by using a steel wire after demoulding;
s9: steam pressure curing: placing the blank formed in the step S8 together with a die into a room for maintenance for 11 hours, and cutting the blank by using a steel wire after demoulding;
s10: warehousing: and (4) taking the green bodies in the S9 out of the kettle by using an aerated concrete panel-severing machine, then performing panel-severing, packaging, inserting into a production line and warehousing.
Compression strength of the blank after warehousing by using a compression testing machineDetecting to obtain the compression strength of 2.9MPa, weighing a blank by an electronic scale, measuring the size to calculate the volume, and obtaining the dry density of 425kg/m3The compression strength and the dry density meet the requirements of national standards.
Example 6
S1: preparing a first raw material: preparing 1000kg of cement, 1000kg of lime, 3846kg of sand slurry, 1115.4kg of aerated concrete blank waste slurry, 269kg of gypsum slurry, 461.5kg of waste slurry generated in the production of a tubular pile and 6.153kg of aluminum powder;
s2: preparing a second raw material: conveying the waste slurry generated in the step S1 for producing the tubular pile into a slurry pond of an aerated concrete production line, and adding 0.1385kg of retarder into the slurry pond;
s3: pumping: pumping waste slurry generated by the production pipe pile added with the retarder in the S2 into an independent storage tank for storage and standby;
s4: feeding and stirring: sequentially adding the sand slurry, the aerated concrete body waste slurry, the gypsum slurry, the pipe pile waste slurry, the lime and the cement into a stirrer in sequence, and stirring and mixing to form a mixture;
s5: heating the slurry: introducing water vapor into the mixture for heating, and testing the diffusivity of the mixture in the stirrer in S4 when the temperature rises to 45 ℃; filling the mixture into a diffusivity cylinder of a mortar diffusivity measuring instrument, trowelling the mixture along the cylinder opening by using a steel ruler, and removing the mixture around the cylinder; quickly and vertically lifting the diffusivity cylinder, gradually diffusing the mixture under the action of self weight, and measuring diameter data of the diffused mixture in different directions by using a steel ruler;
s6: adding aluminum powder: when the diffusivity of the mixture in the stirrer in S5 reaches 30cm, 6.153kg of aluminum powder and 10.768kg of water are mixed, and a mixed solution of the aluminum powder and the water which are stirred in advance is added into the stirrer and stirred for 45 seconds to be uniformly mixed;
s7: pouring: pouring the die with the aerated concrete in the S6 to form a blank;
s8: cutting: placing the blank formed in the step S7 together with the die into a static stop chamber for static stop for 2.5h, and cutting the blank by using a steel wire after demoulding;
s9: steam pressure curing: placing the blank formed in the step S8 together with a die into a room for maintenance for 11 hours, and cutting the blank by using a steel wire after demoulding;
s10: warehousing: and (4) taking the green bodies in the S9 out of the kettle by using an aerated concrete panel-severing machine, then performing panel-severing, packaging, inserting into a production line and warehousing.
Detecting the compression strength of the blank after warehousing by using a compression testing machine to obtain that the compression strength of the blank is 2.8MPa, weighing a blank by using an electronic scale, measuring the size and calculating the volume to obtain that the dry density of the blank is 420kg/m3The compression strength and the dry density meet the requirements of national standards.
The results are summarized in Table 1:
TABLE 1
From examples 1, 2, 3 and 4, according to table 1: other components are unchanged, and when the content of the waste slurry generated in the production of the tubular pile is increased, the compressive strength and the dry density of a blank body of the aerated concrete are gradually improved, so that the waste slurry generated in the production of the tubular pile is an effective component of the aerated concrete, and meanwhile, the concrete is obtained by the following steps of 1, 5 and 6: the other components are unchanged, and when the content of the aluminum powder is increased, the compressive strength and the dry density of the blank of the aerated concrete are also gradually reduced, so the aluminum powder is also an effective component of the aerated concrete.
According to the process for producing the aerated concrete by using the waste slurry generated by the pipe pile, the waste slurry generated by producing the precast concrete pipe pile is used, so that the adding amount of cement in the aerated concrete is reduced, and meanwhile, the strength and the dry density of an aerated concrete product can be ensured to meet the requirements of national standards; the main components of the waste slurry generated in the production process of the precast concrete pipe pile are consistent with the components of part of raw materials used by the aerated concrete, so that the waste slurry can properly replace a certain amount of cement when being applied to the production of the aerated concrete on the premise of ensuring the product quality, the production cost is reduced, the secondary utilization of the waste slurry is realized, the resources are saved, and the environment is protected.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A process for producing aerated concrete by using waste slurry generated by tubular piles is characterized by comprising the following steps:
s1: preparing a first raw material: preparing 12-14% of cement, 12-14% of lime, 47-53% of sand slurry, 14-15% of aerated concrete blank waste slurry, 3-4% of gypsum slurry, 6-9% of waste slurry generated by producing a tubular pile and 0.07-0.08% of aluminum powder;
s2: preparing a second raw material: conveying the waste slurry generated in the step S1 for producing the tubular pile into a slurry pond of an aerated concrete production line, and adding a retarder into the slurry pond;
s3: pumping: pumping waste slurry generated by the production pipe pile added with the retarder in the S2 into an independent storage tank for storage and standby;
s4: feeding and stirring: sequentially adding the sand slurry, the aerated concrete body waste slurry, the gypsum slurry, the pipe pile waste slurry, the lime and the cement into a stirrer in sequence, and stirring and mixing to form a mixture;
s5: heating the slurry: introducing water vapor into the mixture for heating, and detecting the diffusivity of the mixture in the stirrer in S4 when the temperature rises to 45 ℃;
s6: adding aluminum powder: when the diffusivity of the mixture in the stirrer in the S5 reaches 30 +/-1 cm, adding a mixed solution of aluminum powder and water which are stirred in advance into the stirrer and uniformly stirring;
s7: pouring: pouring the aerated concrete in the S6 to form a blank;
s8: cutting: placing the green body belt mold formed in the step S7 into a static stop chamber for static stop, and cutting the green body after demolding;
s9: steam pressure curing: putting the cut blank in the step S8 into an autoclave for autoclave curing;
s10: warehousing: and (5) taking the blank in the S9 out of the kettle, breaking off the board, packaging, inserting into a production line and warehousing.
2. The process for producing aerated concrete by using waste slurry produced by the tubular pile according to claim 1, wherein the retarder in S2 is hydroxycarboxylic acid retarder and salts thereof, and the mass of the hydroxycarboxylic acid retarder and salts thereof is 0.03-0.1% of the mass of the waste slurry produced by producing the tubular pile.
3. The process for producing aerated concrete by using waste slurry produced by tubular piles according to claim 1, wherein the storage tank in the step S3 is a closed container.
4. The process for producing aerated concrete from waste slurry produced by tubular piles according to claim 1, wherein the diffusibility test in S5 is performed by using a diffusibility tester.
5. The process for producing aerated concrete from waste slurry produced by tubular piles according to claim 1, wherein the weight ratio of aluminum powder to water in the step S6 is 1:2, and the stirring time is at least 45 seconds.
6. The process for producing aerated concrete from waste slurry produced by tubular piles according to claim 1, wherein the static chamber curing in S8 is 2-3 hours, and the autoclave curing in S9 lasts 11-12 hours.
7. The process for producing aerated concrete from waste slurry produced by tubular piles according to claim 1, wherein an aerated concrete stripping machine is used in S9 to strip the blank after being taken out of the reactor.
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