CN113548870A - Method for preparing water permeable brick by using fly ash - Google Patents
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- CN113548870A CN113548870A CN202010336410.9A CN202010336410A CN113548870A CN 113548870 A CN113548870 A CN 113548870A CN 202010336410 A CN202010336410 A CN 202010336410A CN 113548870 A CN113548870 A CN 113548870A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 239000011449 brick Substances 0.000 title claims abstract description 73
- 239000010881 fly ash Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 239000002910 solid waste Substances 0.000 claims description 23
- 238000005245 sintering Methods 0.000 claims description 17
- 239000010451 perlite Substances 0.000 claims description 16
- 235000019362 perlite Nutrition 0.000 claims description 16
- 239000004927 clay Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 238000006703 hydration reaction Methods 0.000 claims description 5
- 238000000748 compression moulding Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 230000035699 permeability Effects 0.000 abstract description 13
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000002360 preparation method Methods 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 239000004566 building material Substances 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract description 2
- 238000001354 calcination Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 239000010883 coal ash Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002912 waste gas Substances 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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
-
- 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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/135—Combustion residues, e.g. fly ash, incineration waste
- C04B33/1352—Fuel ashes, e.g. fly ash
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Dispersion Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Manufacturing & Machinery (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for preparing a water permeable brick by using fly ash, belonging to the technical field of preparation of engineering building materials. The invention is based on the physicochemical characteristics of the fly ash and various raw materials, takes the fly ash as the main raw material, reasonably mixes the components by adding proper additives, and prepares the water permeable brick by using the processes of autoclaved curing and high-temperature calcining. Compared with the prior art, the mixing amount of the fly ash can exceed more than 50 parts, and the water permeable brick prepared by the invention has the advantages of high strength and good water permeability, can realize high-valued and resource utilization of the fly ash, also meets the requirement of the current sponge city construction on water permeable materials, and has good market prospect and economic benefit.
Description
Technical Field
The invention belongs to the technical field of preparation of engineering building materials, and particularly relates to a raw material and a method for preparing a water permeable brick by using fly ash.
Background
The fly ash is fine ash captured from flue gas generated after coal combustion, wherein the coal power industry is a large household for producing the fly ash, and the generation amount of the fly ash is also increased rapidly along with the explosive growth of the installed capacity of thermal power in China. At present, the fly ash is widely applied to industries such as buildings, building materials and the like, but the utilization rate is low, and is influenced by the market glide of the building materials industry in China, and the situation that the use amount and the price are sharply reduced appears in the fly ash market in most areas in China, so that the need and the urgency for finding a high-valued comprehensive utilization technology suitable for the fly ash in the coal and electricity industry are provided.
The paving of the water permeable bricks can ensure that most of natural rainfall permeates into the ground, maintain the balance of underground water resources, avoid or reduce geological disasters such as ground surface settlement, ground collapse and the like caused by the reduction of underground water level, can also effectively relieve the flood discharge pressure of a city drainage system, collect, purify and utilize the rainfall, and can also reduce the consumption of the water resources. In addition, the paving of the water permeable bricks can meet the use requirements of human activities on hardened ground, has the ecological advantages of being similar to natural lawns and soil ground, can reduce the urban 'heat island effect', effectively protects the living space of ground surface animals and microorganisms, and is favorable for the balance of the whole natural ecological chain. Therefore, in recent years, sponge city construction has a large market demand for water permeable bricks, and the market prospect is wide.
Although the prior art has widely popularized the preparation of water permeable bricks by using fly ash, the preparation process is limited due to the defects of the preparation process. At present, the main preparation processes of the fly ash water permeable brick comprise two processes: the sintering process has the advantages of good water permeability, high energy consumption and high cost, and has the environmental pollution problems of waste gas emission and the like; the other one is a concrete permeable brick, the cement mixing amount is high, the fly ash mixing amount is low, and the fly ash cannot be greatly consumed.
Therefore, how to provide a method for preparing a water permeable brick by using fly ash with high doping amount is a technical problem to be solved urgently in the field.
Disclosure of Invention
In view of the above, the invention provides a method for preparing a water permeable brick by using fly ash, the raw materials of the invention adopt various industrial solid wastes, the solid waste utilization rate is high, the process is simple, the energy consumption is low, the time consumption is short, and compared with the prior art, the mixing amount of the fly ash can exceed more than 50 parts. The water permeable brick prepared by the invention has the advantages of high strength and good water permeability, can realize high-valued and resource utilization of the fly ash, meets the requirement of sponge city construction on water permeable materials at present, and has good market prospect and economic benefit.
In order to achieve the purpose, the invention adopts the following technical scheme:
the water permeable brick is prepared from the following raw materials in parts by weight: 50-60 parts of fly ash, 20-30 parts of clay, 10-20 parts of active industrial solid waste, 10-20 parts of expanded perlite and 15-25 parts of water.
Further, the water permeable brick is prepared from the following raw materials in parts by weight: 55-60 parts of fly ash, 20-25 parts of clay, 12-18 parts of active industrial solid waste, 12-15 parts of expanded perlite and 15-20 parts of water.
Wherein Al is contained in the active industrial solid waste2O315-20 wt% of SiO2The content is 20-25 parts by weight, and the content of CaO is 5-10 parts by weight; and the particle size of the active industrial solid waste is not more than 10 mm.
And because the expanded perlite has low cost and is easy to obtain, the pore structure of the water permeable brick is adjusted by changing the particle size of the expanded perlite, the porosity and the number of through holes of the water permeable brick can be effectively increased, and the water permeability of the water permeable brick is improved.
The invention also provides a method for preparing the water permeable brick by using the raw materials, namely a method for preparing the water permeable brick by using the fly ash, which specifically comprises the following steps:
(1) weighing the raw materials according to the mixture ratio for later use;
(2) mixing the fly ash weighed in the step (1) with active industrial solid waste, crushing, screening and maintaining at high temperature to obtain granular fly ash;
(3) uniformly mixing the granular fly ash obtained in the step (2) with the clay, expanded perlite and water weighed in the step (1) to obtain a mixture;
(4) and putting the mixture into a mold for compression molding to obtain a green brick, accelerating hydration reaction in the green brick by using an autoclaved curing process, and then putting the green brick into a kiln for sintering to finally obtain the water permeable brick.
Further, in the step (2), the high-temperature curing is performed for 20-24 hours at 70-90 ℃, and the particle size of the granular fly ash is 1-3 mm.
Further, the steam pressure curing process in the step (4) comprises the following steps: curing for 6-10 h under the autoclaved curing condition with the temperature of 110-130 ℃ and the pressure of 0.6-0.8 MPa.
The invention accelerates the hydration reaction in the green brick by using the autoclaved curing process, and finally obtains the high-content fly ash water permeable brick by high-temperature calcination in a kiln. The method not only improves the using amount of the fly ash, develops a new way for the application of the fly ash, but also ensures that the finally prepared high-doped fly ash water permeable brick has excellent performance.
Furthermore, the sintering temperature in the kiln is 1150-1250 ℃, the sintering time is 1.5-2.5 h, and the sintering furnace is naturally cooled to room temperature.
The water permeable brick prepared by the method disclosed by the invention has high strength, the water permeability can meet the requirements of the water permeable pavement brick and water permeable pavement slab (GB/T25993-2010) standard, and the practicability is high. And the mixing amount of the fly ash is high, so that the high-value co-recycling of the fly ash can be realized, the requirements on the permeable material at present can be met, and the method is suitable for popularization and application.
As described above, the method for preparing the water permeable brick by using the fly ash disclosed by the invention has the following excellent effects:
the invention is based on the physicochemical characteristics of the fly ash and various raw materials, the fly ash is used as the main raw material, the components are reasonably mixed by adding a proper additive, the water permeable brick is prepared by using the autoclaved curing and high-temperature calcining processes, the performance test and comparison of the prepared water permeable brick, the mixing of the components and the optimization of process parameters enable the finally obtained water permeable brick to solve the problem of high doping amount in the fly ash-based water permeable brick, and the high-doping-amount fly ash-based water permeable brick with high strength and excellent water permeability is finally obtained. The invention has simple process and convenient operation, achieves the aim of recycling the process solid waste, and provides a permeable brick product for the high-value utilization of the fly ash and the construction of sponge cities.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a preparation method of a high-doping-amount fly ash-based water permeable brick, and the water permeable brick prepared by the method has the characteristics of high strength and good water permeability, and is suitable for popularization and application.
The water permeable brick is prepared from the following raw materials in parts by weight: 50-60 parts of fly ash, 20-30 parts of clay, 10-20 parts of active industrial solid waste, 10-20 parts of expanded perlite and 15-25 parts of water.
Wherein Al is contained in the active industrial solid waste2O315-20 wt% of SiO2The content is 20-25 parts by weight, and the content of CaO is 5-10 parts by weight; and the particle size of the active industrial solid waste material is not more than 10 mm.
The invention also discloses a method for preparing the water permeable brick by using the fly ash, which comprises the following steps:
(1) weighing the raw materials according to the mixture ratio for later use;
(2) mixing the fly ash weighed in the step (1) with active industrial solid waste, crushing, screening and maintaining at high temperature to obtain granular fly ash;
(3) and (3) uniformly mixing the granular fly ash obtained in the step (2) with the clay, the expanded perlite and the water weighed in the step (1) to obtain a mixture.
(4) And putting the mixture into a mold for compression molding to obtain a green brick, accelerating hydration reaction in the green brick by using an autoclaved curing process, and then putting the green brick into a kiln for sintering to finally obtain the water permeable brick.
Further, in the step (2), the high-temperature curing is performed for 20-24 hours at 70-90 ℃, and the particle size of the granular fly ash is 1-3 mm.
Further, the steam pressure curing process in the step (4) comprises the following steps: curing for 6-10 h under the autoclaved curing condition with the temperature of 110-130 ℃ and the pressure of 0.6-0.8 MPa.
Furthermore, the sintering temperature in the kiln is 1150-1250 ℃, the sintering time is 1.5-2.5 h, and the sintering furnace is naturally cooled to room temperature.
The technical solution disclosed and protected by the present invention will be described in detail with specific reference to the following embodiments.
Example 1
The water permeable brick is prepared from the following raw materials in parts by weight: 55 parts of fly ash, 25 parts of clay, 15 parts of active industrial solid waste, 15 parts of expanded perlite and 20 parts of water.
Example 2
The water permeable brick is prepared from the following raw materials in parts by weight: 50 parts of fly ash, 28 parts of clay, 18 parts of active industrial solid waste, 10 parts of expanded perlite and 22 parts of water.
Example 3
The water permeable brick is prepared from the following raw materials in parts by weight: 58 parts of fly ash, 25 parts of clay, 12 parts of active industrial solid waste, 15 parts of expanded perlite and 18 parts of water.
Example 4
The water permeable brick is prepared from the following raw materials in parts by weight: 60 parts of fly ash, 25 parts of clay, 18 parts of active industrial solid waste, 12 parts of expanded perlite and 20 parts of water.
The water permeable bricks are respectively prepared by the raw material formulas disclosed in the above examples 1 to 4 by the following methods, and the specific operation steps are as follows:
(1) weighing the raw materials according to the component ratio for later use;
(2) mixing the coal ash weighed in the step (1) with active industrial solid waste, crushing and screening, and then maintaining at 70-90 ℃ for 20-24 h to obtain granular coal ash with the particle size of 1-3 mm; preferably, the high-temperature curing temperature is 85 ℃, the curing time is 22 hours, and the particle size of the finally prepared granular fly ash is 2 mm;
(3) uniformly mixing the granular fly ash obtained in the step (2) with the clay, expanded perlite and water weighed in the step (1) to obtain a mixture;
(4) and putting the mixture into a mold for compression molding to obtain a green brick, curing for 6-10 h under the autoclaved curing conditions of the temperature of 110-130 ℃ and the pressure of 0.6-0.8 MPa to accelerate the hydration reaction in the green brick, then putting the green brick into a kiln for sintering for 1.5-2.5 h at the temperature of 1150-1250 ℃ and naturally cooling to the room temperature along with the kiln to finally obtain the water permeable brick. More preferably, the autoclaved curing process conditions are as follows: curing for 8 hours under the autoclaved curing condition of the temperature of 110 ℃ and the pressure of 0.7 MPa; and the sintering process conditions are as follows: the sintering temperature in the kiln is 1200 ℃, the sintering heat preservation time is 2h, and the sintering temperature is naturally cooled to the room temperature along with the kiln.
The following performance measurements were performed on the water permeable bricks prepared in examples 1 to 4 by the above specific processes to further verify the technical effects disclosed in the present application, specifically as follows:
the experimental raw materials involved in the invention are purchased from commercial sources, and the experimental method not mentioned is a conventional experimental method. For example:
the compression strength test:
sampling brick, clearAnd (3) washing the surface, measuring and calculating the fracture compressive strength by using a fracture compressive strength device, setting the loading speed to be 0.05MPa/s, and recording the breaking load of 3 samples. Calculating the splitting compressive strength Fu of the test piece to be 0.637K (P/S) by the following formula, wherein Fu is the splitting compressive strength and has a unit of MPa; p is the breaking load, the unit N, K is the thickness correction coefficient of the test piece, S is the area of the breaking surface, the unit mm2。
The equipment and related accessories are purchased from Cangzhou Jingwei instruments manufacturing Inc., and are not described in detail again.
(II) testing the water permeability coefficient:
a sample is cut into a rectangle with the diameter of 100mm and the thickness of 50mm, the periphery of the sample is sealed, so that water can only permeate from the upper surface and the lower surface of the sample, and then the sample is placed in a water permeability coefficient vacuum device for measurement and calculation of the water permeability coefficient.
The detection equipment is purchased from Hebei space inspection engineering instruments, Inc., or is manually made by simple equipment, which is not described in detail herein.
Comparative experiment 1
The difference from the example 1 is that the active industrial solid waste is not contained, and the mixing amount of the fly ash is 40 parts.
Comparative experiment 2
The difference from example 1 is that no expanded perlite is present.
The samples prepared in examples 1-4 and comparative examples 1-2 were taken for compressive strength (MPa) and water permeability coefficient (cm/s), and the results of all 3 samples were averaged as shown in Table 1 below:
table 1 test of compressive strength and water permeability coefficient of water permeable bricks prepared in examples 1 to 4
The results show that compared with the comparative examples 1-2, the coal ash content of the examples 1-4 is improved, and the prepared water permeable brick has high compressive strength and good water permeability and meets the requirement of industrial production. Therefore, the technical scheme disclosed by the application of the invention can realize high-valued and resource utilization of the fly ash, can meet the requirement of the sponge city construction on the permeable material at present, and has good market prospect and economic benefit.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The water permeable brick prepared from the fly ash is characterized by being prepared from the following raw materials in parts by weight: 50-60 parts of fly ash, 20-30 parts of clay, 10-20 parts of active industrial solid waste, 10-20 parts of expanded perlite and 15-25 parts of water.
2. The water permeable brick prepared from fly ash according to claim 1, wherein the water permeable brick is prepared from the following raw materials in parts by weight: 55-60 parts of fly ash, 20-25 parts of clay, 12-18 parts of active industrial solid waste, 12-15 parts of expanded perlite and 15-20 parts of water.
3. The water permeable brick prepared from fly ash according to claim 1 or 2, wherein Al in the active industrial solid waste is2O315-20 wt% of SiO2The content is 20-25 parts by weight, and the content of CaO is 5-10 parts by weight; and the particle size of the active industrial solid waste is not more than 10 mm.
4. A method for preparing a water permeable brick by using fly ash is characterized by comprising the following steps:
(1) weighing the raw materials according to the raw material proportion of any one of claims 1 to 3 for later use;
(2) mixing the fly ash weighed in the step (1) with active industrial solid waste, crushing, screening and maintaining at high temperature to obtain granular fly ash;
(3) uniformly mixing the granular fly ash obtained in the step (2) with the clay, expanded perlite and water weighed in the step (1) to obtain a mixture;
(4) and putting the mixture into a mold for compression molding to obtain a green brick, accelerating hydration reaction in the green brick by using an autoclaved curing process, and then putting the green brick into a kiln for sintering to finally obtain the water permeable brick.
5. The method for preparing the water permeable brick by using the fly ash as claimed in claim 4, wherein in the step (2), the high-temperature curing is performed at 70-90 ℃ for 20-24 h, and the particle diameter of the granular fly ash is 1-3 mm.
6. The method for preparing the water permeable brick by using the fly ash as claimed in claim 4, wherein the autoclaved curing process in the step (4) comprises the following steps: curing for 6-10 h under the autoclaved curing condition with the temperature of 110-130 ℃ and the pressure of 0.6-0.8 MPa.
7. The method for preparing the water permeable brick by using the fly ash as claimed in claim 6, wherein the sintering temperature in the kiln is 1150-1250 ℃, the sintering time is 1.5-2.5 h, and the water permeable brick is naturally cooled to room temperature along with the kiln.
8. A water permeable brick prepared by the method of any one of claims 4 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336410.9A CN113548870A (en) | 2020-04-23 | 2020-04-23 | Method for preparing water permeable brick by using fly ash |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336410.9A CN113548870A (en) | 2020-04-23 | 2020-04-23 | Method for preparing water permeable brick by using fly ash |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114230312A (en) * | 2022-01-07 | 2022-03-25 | 山东理工大学 | Fly ash water permeable brick and preparation method thereof |
| CN114315316A (en) * | 2022-01-07 | 2022-04-12 | 山东理工大学 | Gold tailing water permeable brick and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114230312A (en) * | 2022-01-07 | 2022-03-25 | 山东理工大学 | Fly ash water permeable brick and preparation method thereof |
| CN114315316A (en) * | 2022-01-07 | 2022-04-12 | 山东理工大学 | Gold tailing water permeable brick and preparation method thereof |
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