CN115231839A - Cement-based composite material prepared from sludge ash and preparation method thereof - Google Patents
Cement-based composite material prepared from sludge ash and preparation method thereof Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 143
- 239000004568 cement Substances 0.000 title claims abstract description 96
- 239000002131 composite material Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000011398 Portland cement Substances 0.000 claims abstract description 15
- 239000003245 coal Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 14
- 239000011374 ultra-high-performance concrete Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000004567 concrete Substances 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000012360 testing method Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 6
- 238000010248 power generation Methods 0.000 description 6
- 238000006467 substitution reaction Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000011083 cement mortar Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
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- 229910021487 silica fume Inorganic materials 0.000 description 3
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 101100008049 Caenorhabditis elegans cut-5 gene Proteins 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
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- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- 239000007769 metal material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/28—Cements from oil shales, residues or waste other than slag from combustion residues, e.g. ashes or slags from waste incineration
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/02—Portland cement
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The embodiment of the invention discloses a cement-based composite material prepared from sludge ash and a preparation method thereof. The method mainly replaces 20-60% of cement clinker and other mass in the ordinary portland cement with sludge ash. The cement-based composite material prepared by using the sludge ash in the embodiment of the invention takes the sludge ash as a cement admixture, and firstly, the cement consumption can be reduced, thereby reducing the carbon emission and the energy consumption; secondly, due to the curing effect of the cement-based material, the heavy metal in the sludge ash can be cured in the cement-based material, so that the harmless treatment of the sludge ash is realized; finally, the resource utilization of the sludge ash can be realized, the environment is protected, and the land resource is saved. In addition, the working performance is improved to a certain extent along with the increase of the replacement rate of the sludge ash, and when the replacement rate reaches 60%, the working performance is improved by 10%. Compared with a control group without doped sludge ash, the flexural strength of the concrete for 2 days is basically equal, and the requirement of the ultrahigh-performance concrete on the strength of the cement doped with sludge ash as a cementing material is met.
Description
Technical Field
The invention relates to the technical field of cement-based composite materials, in particular to a cement-based composite material prepared by using sludge ash and a preparation method thereof.
Background
Sludge is the product of sewage after treatment and is characterized by high water content and containing a large amount of organic matters. According to the statistics yearbook of urban and rural construction of housing and urban and rural construction department, in 2020, sludge (calculated according to the water content of 80%) in China reaches 7168 ten thousand tons, and can reach 7 hundred million tons in 2060 years.
As an effective means for sludge treatment, the incineration can realize sludge reduction and facilitate subsequent treatment of sludge. The basic principle of sludge incineration is to decompose all organic components present in sludge into small molecular gas-phase substances such as carbon dioxide and water under high temperature conditions. Compared with other sludge treatment modes, the advantages of incineration treatment include the following points: firstly, organic matters in the sludge are decomposed most thoroughly, and potential threats of the organic matters to the environment are eliminated; secondly, the volume of the sludge is reduced, and the sludge is convenient to dispose; thirdly, the treatment time is short, and long-term sludge stockpiling cannot be caused.
Thermal power generation is a main power generation mode in China and plays a very important role in the development of China. However, the thermal power generation has some disadvantages that firstly, the fire coal can generate a large amount of SO 2 Acid rain is caused by acid gas, and smoke pollution is caused; meanwhile, as the main combustion material of thermal power generation is coal and coal resources are non-renewable resources, a large amount of coal causes resource waste and is not beneficial to sustainable development.
In order to reduce the consumption of coal in thermal power generation and realize the sustainable development of thermal power generation, the coal-fired coupled sludge combustion technology is more and more concerned by people. The dried sludge is used for burning the coal-fired boiler of the power plant, thereby not only reducing the consumption of coal, but also realizing the effective disposal of the sludge.
However, in the prior art, the main disposal mode of sludge ash generated after incineration of sludge is landfill disposal, which not only occupies a large amount of land resources, but also contains a large amount of heavy metal substances, and if the sludge ash is not properly disposed, the heavy metal substances in the sludge ash can pollute surrounding soil and underground water. Therefore, the realization of resource recycling of the sludge ash has important significance.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention discloses a method for preparing a cement-based composite material by using sludge ash.
The method for preparing the cement-based composite material by using the sludge ash mainly comprises the following steps: replacing 20-60% of cement clinker and other mass in the ordinary portland cement with sludge ash to obtain the cement-based composite material prepared by using the sludge ash.
According to a preferred embodiment of the invention, 20% of the mass of cement clinker and the like in ordinary portland cement is replaced by sludge ash, and the cement-based composite material prepared by using the sludge ash is prepared.
According to a preferred embodiment of the invention, 40% of the mass of cement clinker and the like in ordinary portland cement is replaced by sludge ash, and the cement-based composite material prepared by using the sludge ash is prepared.
According to a preferred embodiment of the invention, 60% of the mass of cement clinker and the like in ordinary portland cement is replaced by sludge ash, and the cement-based composite material prepared by using the sludge ash is prepared.
According to a preferred embodiment of the present invention, the sludge ash is sludge ash generated after coupling sludge burning coal.
According to a preferred embodiment of the present invention, the particle size of the sludge ash is less than 0.1mm.
According to a preferred embodiment of the present invention, the quartz content in the sludge ash is 46wt%; the content of alumina in the sludge ash is 27wt%; the content of calcium oxide in the sludge ash is 9wt%; 9wt% of ferric oxide in the sludge ash.
In another aspect, the invention discloses a cement-based composite material prepared from the sludge ash.
The cement-based composite material prepared by using the sludge ash is prepared by the method for preparing the cement-based composite material by using the sludge ash.
Compared with the prior art, the cement-based composite material prepared by using the sludge ash has the following beneficial effects:
the cement-based composite material prepared from the sludge ash in the embodiment of the invention is prepared by screening the sludge ash, using the screened sludge ash as a cement admixture to partially replace cement clinker, and then preparing the obtained sludge ash-doped cement-based composite material into a required product. Compared with the prior art, the invention fully realizes the resource utilization of the sludge ash, reduces the cement consumption and has the highest cement substitution rate of more than 60 percent; secondly, the sludge ash is not required to be treated in other treatment modes, only simple screening treatment is needed, substances harmful to the environment are not used and generated, the resource utilization is convenient, the operability and reproducibility are strong, the energy consumption is low, and the requirements of green and environment protection are met; finally, the sludge ash is used for cement-based materials, and the influence of heavy metals in the sludge ash on the environment can be reduced due to the solidification effect of the cement. Therefore, the sludge ash is used as a cement admixture, and firstly, the cement consumption can be reduced, so that the carbon emission and the energy consumption are reduced; secondly, due to the curing effect of the cement-based material, the heavy metal in the sludge ash can be cured in the cement-based material, so that the harmless treatment of the sludge ash is realized; finally, the resource utilization of the sludge ash can be realized, the environment is protected, and the land resource is saved.
In addition, according to GB/T17671-1999 method for testing cement mortar strength (ISO method) and GB/T2419-2005 method for measuring cement mortar fluidity, after autoclaved curing, the compressive strength of 2 days can reach more than 150MPa even if the substitution rate reaches 60%, and the flexural strength of 2 days is basically equal to that of a control group without doping the sludge ash, thereby meeting the requirement of the ultrahigh-performance concrete on the strength of the cement doped with the sludge ash as a cementing material; the working performance is improved to a certain extent along with the increase of the replacement rate of the sludge ash, and when the replacement rate reaches 60 percent, the working performance is improved by 10 percent.
Additional features of the invention will be set forth in the description which follows. Additional features of some aspects of the invention will become apparent to those of ordinary skill in the art upon examination of the following description and accompanying drawings or may be learned by the manufacture or operation of the embodiments. The features of the present disclosure may be realized and attained by practice or use of various methods, instrumentalities and combinations of the specific embodiments described below.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not limit the invention. Like reference symbols in the various drawings indicate like elements. Wherein the content of the first and second substances,
FIG. 1 is a schematic flow diagram of a method for producing a cementitious composite using sludge ash in accordance with some embodiments of the present invention;
FIG. 2 is a graphical representation of the fluidity of different substitution rates for cementitious composites made using the sludge ash in accordance with some embodiments of the present invention;
FIG. 3 is a graphical representation of the compressive strength of various substitution rates of cementitious composites made using the sludge ash in accordance with some embodiments of the present invention;
FIG. 4 is a graphical representation of flexural strength for different substitution rates of cementitious composites made using the sludge ash in accordance with some embodiments of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
One aspect of the embodiments of the present invention discloses a method for preparing a cement-based composite material from sludge ash.
As shown in fig. 1, the method for preparing a cement-based composite material by using sludge ash mainly comprises the following steps: replacing 20-60% of cement clinker and other mass in the ordinary portland cement with sludge ash to obtain the cement-based composite material prepared from the sludge ash.
For example, 20% of the mass of cement clinker and the like in ordinary portland cement can be replaced by sludge ash, and the cement-based composite material prepared by using the sludge ash can be prepared.
For example, 40% of the mass of cement clinker in ordinary portland cement can be replaced by the mass of sludge ash, and the cement-based composite material prepared from the sludge ash can be prepared.
For another example, 60% of the cement clinker and other mass in the ordinary portland cement can be replaced by the sludge ash, and the cement-based composite material prepared by using the sludge ash is prepared.
Wherein, the sludge ash can adopt sludge ash generated after the coupling of sludge fire coal. The quartz content in the sludge ash is 46wt%; the content of alumina in the sludge ash is 27wt%; the content of calcium oxide in the sludge ash is 9wt%; 9wt% of ferric oxide in the sludge ash.
Specifically, the mineral composition in the sludge ash is analyzed through X-Ray Diffraction (XRD) analysis and X-Ray Fluorescence spectroscopy (XRF), and the analysis result shows that: the sludge ash mainly contains 46wt% of quartz, 27wt% of alumina, 9wt% of calcium oxide and 9wt% of ferric oxide. The sludge ash is obtained after the sludge is treated at high temperature, the treatment temperature reaches over 1000 ℃, and the high-temperature treatment ensures that quartz, alumina and the like in the sludge ash contain a large amount of activity, so the sludge ash has certain volcanic ash effect and filling effect, can accelerate the hydration speed of cement to a certain degree, and can improve the compactness of the internal structure of the ultrahigh-performance concrete to a certain degree by the filling effect. The embodiment of the invention is based on the mechanism to carry out resource utilization on sludge ash generated after sludge fire coal coupling, thereby achieving the purpose of reducing the cement consumption.
Wherein the particle size of the sludge ash is less than 0.1mm. Specifically, the sludge ash is screened, so that all particles can pass through a 0.1mm screen, and the particle size is less than 0.1mm.
In another aspect of an embodiment of the present invention, a cement-based composite material prepared using the sludge ash is disclosed.
The cement-based composite material prepared from the sludge ash is prepared by the method for preparing the cement-based composite material from the sludge ash.
The properties of the cement-based composite material prepared using the sludge ash according to the examples of the present invention will be described below by way of specific examples.
Specifically, the screened sludge ash is used as a cement admixture to replace cement clinker by the mass of 20%, 40% and 60% substitution rate (according to 42.5R ordinary portland cement in GB175-2007 general portland cement regulation, chemical components are shown in Table 1), so that the sludge ash-doped cement is obtained and used as a cementing material for preparing the ultrahigh-performance concrete.
TABLE 1 Cement Clinker chemical composition
| Chemical composition | SiO 2 | Al 2 O 3 | CaO | Fe 2 O 3 | MgO | SO 3 | Others are |
| Mass fraction (%) | 23.0 | 6.0 | 62.5 | 4.3 | 0.9 | 1.1 | 2.2 |
According to GB/T17671-1999 method for testing cement mortar strength (ISO method), sludge ash is used to prepare ultra-high performance concrete mixed with sludge ash, and cement clinker is used to prepare pure cement ultra-high performance concrete, the formulation is shown in Table 2.
TABLE 2 sludge ash doped ultra-high performance concrete mix proportion design
The concrete with the ultra-high performance is a prism with the size of 40mm multiplied by 160mm, and the concrete preparation process is as follows:
1. preparing materials: preparing cement, sludge ash, silica fume, water, a water reducing agent, sand, stone and steel fibers with corresponding mass according to the mixture ratio in the table 2;
2. stirring: firstly, pouring cement, silica fume, sand and stone (pure cement ultra-high performance concrete) or cement, silica fume, sludge fume, sand and stone (sludge fume doped ultra-high performance concrete) into a stirring pot, placing the stirring pot on a fixed frame of a stirrer, and lifting the stirring pot to a fixed position; starting the stirrer, stirring at a low speed for 240s, then uniformly mixing and stirring water and the water reducing agent, firstly pouring 70% of water and the water reducing agent, stirring for 120s, then pouring the rest 30% of water and the water reducing agent into the stirring pot, and stirring for 120s; after stirring, slowly adding the steel fibers into the stirring pot, and after adding the steel fibers, rotating the machine to a high speed for stirring for 300s. In each stirring stage, the time error is within +/-1 s;
3. testing the fluidity: when the jumping table is used for the first time, firstly, the jumping is carried out for 25 times in one cycle, then, the mixed slurry is quickly filled into a test mold (consisting of a truncated cone round mold and a mold sleeve, wherein the inner surface of the round mold is made of a metal material, the size of the round mold is 60mm in height and 0.5mm in internal diameter of an upper opening, 0.5mm in internal diameter of a lower opening, 100mm in internal diameter of the lower opening, 120mm in external diameter of the lower opening, and the thickness of the mold wall is more than 5 mm.) in two layers, the first layer is filled to the position of about two thirds of the height of the truncated cone round mold, each layer is divided by a knife in two mutually vertical directions for 5 times, and a tamping bar is used for uniformly tamping 15 times from the edge to the center; then, a second layer of mortar was loaded, the mortar was loaded to a height of about 20mm above the truncated cone round mold, each of the two perpendicular directions was cut 5 times with a knife, and the mortar was uniformly pounded 10 times from the edge to the center with a pounding rod. The sand should be slightly higher than the test mould after tamping. The tamping depth is that the first layer is tamped to half of the height of the mortar, and the second layer is tamped not to exceed the surface of the tamped bottom layer. When the mortar is filled and tamped, the mold is stabilized by hands without moving the mold. And after the tamping is finished, taking down the die sleeve, inclining the small knife, wiping off the slurry higher than the truncated cone circular die from the middle to the edge at an angle close to the horizontal angle twice, and wiping off the slurry falling on the table top. The truncated cone round die is lifted vertically and slightly upwards. The jump table was immediately actuated to complete 25 jumps within 25s ± 1s at a frequency of once per second.
4. Forming by using a vibrating table: pouring the slurry in the stirring pot into a prism mold of 40mm multiplied by 160mm, placing the mold on a vibration table, and starting the vibration table; after the vibration is finished, taking down the prism mould, scraping off slurry higher than the test mould by using a scraping ruler, and leveling; marking on the test mould or using a character bar to indicate the number of the test piece; and covering a plastic film after the slurry is initially set.
5. Removing the mold: standing the test piece for 24 hours and then removing the mold;
6. and (5) maintenance: and (3) carrying out autoclaved curing, removing the mold 24h after the pouring of the ultrahigh-performance concrete is finished, placing the mold removed sample into an autoclave, curing for 8 hours under the conditions of 1.0MPa and 180 ℃, and measuring the compressive strength and the flexural strength of the sample for 2 days.
After curing for 2 days, the strength of the ultrahigh-performance concrete is determined according to the requirements of GB/T17671-1999 Cement mortar Strength test method (ISO method).
The results show that: the fluidity is improved to a certain extent along with the increase of the replacement rate of the sludge ash, when the replacement rate reaches 60 percent, the working performance is improved by more than 10 percent, and the fluidity with different replacement rates is shown in figure 2; after autoclaved curing, the mud-ash-doped ultrahigh-performance concrete has the compressive strength of 150MPa in 2 days even if the replacement rate reaches 60 percent, and the flexural strength of 2 days is basically equal to that of a control group without the mud ash, so that the requirement of the ultrahigh-performance concrete on the strength of the mud-ash-doped cement as a cementing material is met, and the strength performance indexes of different replacement rates are shown in figures 3 and 4.
The steel fiber cement-based composite material in the embodiment is an ultrahigh-strength cement-based composite material with high strength, high toughness and low porosity, and the compression strength of the ultrahigh-strength cement-based composite material can reach 800MPa. The method is mainly applied to the fields of high-rise buildings, large-span structures and the like. However, in steel fiber cement-based composites, the cement is usually 600kg/m for high strength 3 —1000kg/m 3 Approximately twice the amount of cement-based material. The cement industry is an industry with high carbon emission and energy consumption, and CO emitted in the production process of cement 2 Accounts for the total CO of human activities 2 5% -8% of the emission, and the energy consumption accounts for 12% -15% of the industrial energy consumption. CO 2 2 The generated greenhouse effect causes global warming, thereby causing the melting sea level of glaciers to rise, further aggravating land desertification and destroying the ecological balance of the earth.
The embodiment of the invention takes the sludge ash as the cement admixture, and firstly, the cement consumption can be reduced, thereby reducing the carbon emission and the energy consumption; secondly, due to the curing effect of the cement-based material, the heavy metal in the sludge ash can be cured in the cement-based material, so that the harmless treatment of the sludge ash is realized; finally, the resource utilization of the sludge ash can be realized, the environment is protected, and the land resource is saved.
It should be noted that all of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
In addition, the above-described embodiments are exemplary, and those skilled in the art, having benefit of this disclosure, will appreciate numerous solutions that are within the scope of the disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.
Claims (8)
1. A method for preparing a cement-based composite material by using sludge ash is characterized in that 20-60% of cement clinker and other mass in ordinary portland cement are replaced by the sludge ash, and the cement-based composite material prepared by using the sludge ash is prepared.
2. The method for preparing a cement-based composite material using sludge ash according to claim 1,
replacing 20% of cement clinker and other mass in the ordinary portland cement with sludge ash to obtain the cement-based composite material prepared from the sludge ash.
3. The method for preparing a cement-based composite material using sludge ash as claimed in claim 1,
replacing 40% of cement clinker and other mass in the ordinary portland cement with sludge ash to obtain the cement-based composite material prepared from the sludge ash.
4. The method for preparing a cement-based composite material using sludge ash according to claim 1,
replacing 60% of cement clinker and other mass in the ordinary portland cement with sludge ash to obtain the cement-based composite material prepared by using the sludge ash.
5. The method for producing a cement-based composite material using sludge ash according to one of claims 1 to 4,
the sludge ash is generated after sludge fire coal is coupled.
6. The method for producing a cement-based composite material using sludge ash according to one of claims 1 to 4,
the particle size of the sludge ash is less than 0.1mm.
7. The method for manufacturing a cement-based composite material using sludge ash according to any one of claims 1 to 4,
the content of quartz in the sludge ash is 46wt%;
the content of alumina in the sludge ash is 27wt%;
the content of calcium oxide in the sludge ash is 9wt%;
9wt% of ferric oxide in the sludge ash.
8. A cement-based composite material prepared using sludge ash, wherein the cement-based composite material prepared using sludge ash is prepared by the method for preparing a cement-based composite material using sludge ash according to any one of claims 1 to 7.
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| CN116535162A (en) * | 2023-05-08 | 2023-08-04 | 天津水泥工业设计研究院有限公司 | Ultra-high performance concrete prepared by multi-solid waste cooperation and preparation method thereof |
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