CN115140987B - Porous material based on construction waste slurry and preparation method thereof - Google Patents
Porous material based on construction waste slurry and preparation method thereof Download PDFInfo
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- CN115140987B CN115140987B CN202210522109.6A CN202210522109A CN115140987B CN 115140987 B CN115140987 B CN 115140987B CN 202210522109 A CN202210522109 A CN 202210522109A CN 115140987 B CN115140987 B CN 115140987B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—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 cold phosphate binders
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- 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)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a porous material based on construction waste mud and a preparation method thereof. The method for preparing the porous material from the construction waste slurry comprises the following steps: wet grinding treatment is carried out on the construction waste slurry, and a thickening agent is added to obtain first slurry; the time for adding the thickener is before, during or after wet grinding, and the mass ratio of the solid phase in the building waste slurry to the thickener is 1:0.001 to 0.02; uniformly mixing the first slurry with cement or cement slurry to obtain second slurry; and curing and drying the second slurry to obtain the porous material. The porous material comprises a material prepared by the method for preparing the porous material from the construction waste mud. The beneficial effects of the invention include: solves the current situation that the disposal of the waste mud is difficult. The process is simple, special processing and preparation are not needed, and only stirring maintenance is needed. The pore structure is controllable, can be distributed in a nano-to-micron level and width, and can be distributed in a nano range in a concentrated way.
Description
Technical Field
The invention relates to the field of building materials, in particular to a porous material based on building waste mud and a preparation method thereof.
Background
Along with the continuous acceleration of the urban construction process, urban viaducts, rail transit and key traffic road networks are comprehensively propelled, and a large amount of building waste mud is generated. The recycling of the building waste mud is an important work at the present stage, and although the recycling attempt is currently performed in a certain field, the problems of small utilization quantity, low utilization efficiency and the like exist, which are not proportional to the increasing quantity of the waste mud.
The existing treatment mode of the waste mud mainly comprises the steps of transporting the waste mud to suburbs for natural drying, and has the defects of low efficiency, high cost, long period and the like, and even has the phenomenon of theft and random discharge of the waste mud, so that the ecological system of the river and the lake is destroyed and the water use safety of citizens is endangered. Therefore, the harmless treatment and recycling of the construction engineering waste mud become an environmental problem and a social problem which are needed to be solved in the current engineering industry.
Disclosure of Invention
The invention aims to solve at least one of the defects in the prior art, one of the aims of the invention is to realize the comprehensive utilization of the building waste mud, and the other aim is to provide a novel porous material.
In order to achieve the above object, the present invention provides a method for preparing a porous material from construction waste mud.
The preparation method can comprise the following steps: wet grinding treatment is carried out on the construction waste slurry, and a thickening agent is added to obtain first slurry; the time for adding the thickener is before, during or after wet grinding, and the mass ratio of the solid phase in the building waste slurry to the thickener is 1:0.001 to 0.02; mixing the first slurry with cement or cement slurry, and uniformly stirring to obtain second slurry; and curing and drying the second slurry to obtain the porous material.
According to an exemplary embodiment of the present invention, the thickener may include one or more of polyacrylamide, carrageenan, guar gum, cellulose ether, redispersible emulsion powder, and carboxymethyl cellulose.
According to an exemplary embodiment of the invention, the construction waste mud may comprise engineering mud discharged by a construction project.
According to an exemplary embodiment of the present invention, the construction waste mud may include the following components in mass percent: 40 to 96.95 percent of water, 2 to 20 percent of bentonite particles, 1 to 10 percent of clay particles, 0 to 20 percent of sand and 0.05 to 10 percent of additive.
According to an exemplary embodiment of the invention, the particle size of the solid phase particles in the first slurry is below 75 μm; the solid phase content in the first slurry is 2.05-60%.
According to an exemplary embodiment of the present invention, the mass ratio of the first slurry to the cement may be 1:0.2 to 1; the volume ratio of the first slurry to the cement slurry may be 1:0.1 to 4, and the cement paste may comprise 50 to 75% cement.
According to an exemplary embodiment of the present invention, the relative humidity is 45-95% and the temperature of the environment is 5-40 ℃ during the curing process.
In another aspect, the present invention provides a porous material based on construction waste mud.
The porous material may include a material prepared by the method for preparing a porous material from construction waste mud described above.
According to an exemplary embodiment of the invention, the volume of pores in the porous material is 20-88%.
According to an exemplary embodiment of the present invention, the pore volume of the porous material having a size of 100nm or less is 40 to 100% of the total pore volume, and the pore volume having a size of 100nm to 1 μm is 0 to 60% of the total pore volume.
Compared with the prior art, the invention has the beneficial effects that at least one of the following contents is included:
(1) The waste mud is used for preparing the porous material, so that the current situation that the disposal of the waste mud is difficult is solved.
(2) The process is simple, no special processing method is needed for preparation, and only stirring maintenance is needed.
(3) The pore structure is controllable, can be distributed in a nano-to-micron level and width, and can be distributed in a nano range in a concentrated way.
(4) Wide raw materials, low cost and good safety.
(5) The porous material based on the building waste mud has the advantages of low heat conductivity and fixed density grade, and can promote the development of high-performance heat insulation materials.
Drawings
The foregoing and other objects and features of the invention will become more apparent from the following description taken in conjunction with the accompanying drawings in which:
FIG. 1 illustrates a flow chart of a method of preparing a porous material from construction waste mud in an exemplary embodiment of the invention;
FIG. 2 shows a microscopic scanning electron microscope image of a porous material scale of 2 μm based on construction waste mud in an exemplary embodiment of the present invention;
FIG. 3 shows a microscopic scanning electron microscope image of a porous material scale of 1 μm based on construction waste mud in an exemplary embodiment of the present invention;
fig. 4 shows a thermal conductivity comparison of a porous material based on construction waste mud and existing porous concrete in an exemplary embodiment of the present invention.
Detailed Description
The present invention will be better understood by those skilled in the art by reference to the following detailed description of the present invention taken in conjunction with the accompanying drawings and specific embodiments.
Example embodiment 1
The present exemplary embodiment provides a method of preparing a porous material from construction waste mud. The method is that firstly, the construction waste slurry is wet-ground to reduce the size of solid phase particles in the construction waste slurry, improve the potential pozzolanic activity of bentonite and clay, and further enhance the solid phase suspension property of the slurry through the thickening of the additive. The wet-milled slurry is then mixed with cement until homogeneous, the cement being suspended in the slurry and uniformly distributed around the solid phase of the slurry. And finally, curing, wherein as the curing age increases, cement is continuously hydrated, hydration products are enriched and grow on particles such as bentonite and clay, and part of hydration products react with slurry solid phase to generate secondary hydration products; the hydration products on the slurry solid-phase particles and the hydration products on the cement particles are mutually overlapped to form a framework overlapped by the solid-phase particles, the microstructure is strengthened, and the micro-nano porous structure is obtained after the slurry solid-phase particles and the cement particles are dried.
Specifically, as shown in fig. 1, the preparation method may include the steps of:
s10: wet milling treatment is carried out on the construction waste slurry, and a thickening agent is added to obtain first slurry.
After wet milling, the solid phase content in the first slurry is 2.05-60%, the wet milling treatment can reduce the size of solid phase particles in the building waste slurry, and the wet milling product has small fineness, so that the subsequent operation is facilitated.
In this embodiment, the construction waste slurry may be shield slurry, and of course, the invention is not limited thereto, and the invention has universality, and can be used for manufacturing porous materials by using various construction waste slurries, such as pile foundation engineering waste slurry, grouting return slurry, municipal slurry or slot wall slurry.
In this embodiment, the construction waste mud may comprise the following components in mass percent:
40-96.95% water, e.g. 41%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%;
2-20% bentonite particles, e.g., 3%, 5%, 7%, 9%, 11%, 13%, 15%, 17%, 19%;
1-10% clay particles, e.g., 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%;
0 to 20% sand, for example, 0.1%, 1%, 3%, 5%, 7%, 9%, 11%, 13%, 15%, 17%, 19%;
and 0.05 to 10% of an additive, for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 9.5%.
In this example, the solid phase particles in the construction waste slurry have a particle size of 0.1 μm to 10mm, for example, 0.2 μm, 0.5 μm, 1 μm, 20 μm, 30 μm, 50 μm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 1mm, 2mm, 5mm, 8mm, 9.5mm, and the like.
In this example, the particle size of the solid phase particles in the first slurry after wet milling is less than 75 μm, for example 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm. The invention can reduce the granularity of solid phase particles through wet grinding; the size of the solid phase particles can effectively control the pore size of the product, if the size of the solid phase particles is small, the number of dissociated sheets is large, the space formed by lap joint is small, and the pore size of the obtained product is small.
In this embodiment, the thickener may be added to the construction waste slurry first, and then wet-grinding treatment may be performed, or the thickener may be added during wet-grinding, or the thickener may be added to the construction waste slurry after wet-grinding. Wherein, the mass ratio of the solid phase in the construction waste slurry to the thickener is 1:0.001 to 0.02; for example, 1:0.002, 1:0.003, 1:0.005, 1:0.01, 1:0.015, 1:0.019.
when the thickening agent is added before and after wet grinding, stirring can be performed, and the thickening agent is added in the wet grinding process without stirring. After the thickener is added before and after wet milling, the thickener is stirred with the first slurry material uniformly, the thickener is added in the wet milling process, and the thickener and the slurry are mixed uniformly in the wet milling process. The stirring time and stirring rate are not particularly limited as long as the thickener is uniformly distributed in the slurry, and for example, the stirring time may be 120s and the stirring rate may be 430r/min.
In this embodiment, after wet milling the construction waste mud, it may be left for a period of time, for example 24 hours, to allow the construction waste mud to fully hydrate and expand.
In this embodiment, the thickener may include one or more of polyacrylamide, carrageenan, guar gum, cellulose ether, redispersible latex powder, and carboxymethyl cellulose. The thickening agent can further enhance the suspension property of solid phase particles in the slurry, and is beneficial to the formation of porous materials.
S20: and mixing the first slurry with cement or cement slurry, and uniformly stirring to obtain second slurry. The stirring time and stirring rate may not be particularly required as long as the cement can be suspended in the first slurry and uniformly distributed around the slurry solid phase particles.
In this embodiment, the mass ratio of the first slurry to the cement may be 1:0.2 to 1, for example 1: 0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9.
the volume ratio of the first slurry to the cement slurry is 1:0.1 to 4, for example 1:0.2, 1:0.5, 1:1. 1:1.5, 1:2. 1:2.5, 1:3. 1:3.5, 1:3.9. the cement slurry comprises 50-75% cement, for example 51%, 55%, 60%, 65%, 70%, 74%.
The proportion of cement and cement paste in the construction waste slurry is a key factor for constructing the pore structure, and the proportion of cement and cement paste is controlled within the range, so that the cement material can fully construct micro-nano micro pores.
In this embodiment, the cement may be an existing cement raw material such as aluminate cement, sulphoaluminate cement, silicate cement, phosphate cement, or the like.
S30: and curing and drying the second slurry to obtain the porous material.
In this embodiment, the relative humidity may be 45-95% and the temperature of the environment may be 5-40 ℃ during curing. For example, during curing, the relative humidity is 90% and the ambient temperature is 22 ℃.
Along with the increase of the curing age, the cement is continuously hydrated, hydration products are enriched and grow on particles such as bentonite, clay and the like, and partial hydration products react with slurry solid-phase particles to generate secondary hydration products.
In this embodiment, drying may include conventional drying at not higher than 80 ℃, vacuum drying, or freeze drying until completely dried. In this example, various drying methods can be used, but the drying temperature cannot exceed 80 ℃, and too high a drying temperature is liable to cause transformation and decomposition of hydration products.
Example embodiment 2
The present exemplary embodiment provides a porous material based on construction waste mud.
The porous material may include a material prepared using the method for preparing a porous material from construction waste mud described in example 1.
Fig. 2 is a microscopic electron microscope scan with a scale of 2 μm for the porous material of the present example, and as can be seen from fig. 2, the porous material has a plurality of slurry-introduced platelets, on which amorphous calcium silicate hydrate (aluminum) gel, needle-like ettringite, etc. are formed, and which have the phenomenon of overlapping and interacting with each other, forming a skeleton, and in addition, the solid phase unoccupied portion, the pores become a plurality of micro-nano-scale holes. Fig. 3 is a microscopic electron microscope scan of the porous material of the present embodiment with a scale of 1 μm, and it can also be seen from fig. 3 that the porous material contains a portion of irregular micro-nano-scale pores.
The dry density affects the porosity and pore volume ratio of the porous material in different sizes, table 1 shows that the dry density varies from 281 to 1851kg/m 3 A change; variation of porosity and pore volume ratio of different sizes: the dry density increases and the porosity decreases while Kong Zhanbi below 100nm increases.
In this embodiment, the pore volume ratio in the porous material is 20 to 88%, for example 21%, 25%, 30%, 45%, 60%, 70%, 80%, 85%, 87%.
In this embodiment, the pore volume of the porous material having a size of 100nm or less is 40 to 100% of the total pore volume, for example, 41%, 45%, 50%, 63%, 81%, 94%, 99%. Pore volumes in the range of 100nm to 1 μm account for 0 to 60%, e.g. 1%, 6%, 19%, 37%, 50%, 55%, 59% of the total pore volume. The porosity and pore volume of the porous materials were tested at different dry densities according to the present invention, and the test results are shown in table 1.
TABLE 1 porosities and pore volume fractions of different sizes for porous materials of the invention
| Dry density (kg/m) 3 ) | Porosity (%) | >Kong Zhanbi (%) | Kong Zhanbi (%) |
| 281 | 88.0 | 59.7 | 40.3 |
| 424 | 82.13 | 50.4 | 49.6 |
| 533 | 77.45 | 49.3 | 50.7 |
| 722 | 69.36 | 36.8 | 63.2 |
| 982 | 58.30 | 18.3 | 81.7 |
| 1190 | 49.36 | 5.8 | 94.2 |
| 1851 | 21.28 | 0 | 100 |
In the embodiment, the porous material can be used as a heat insulation material in the fields of pipeline heat insulation, building energy conservation, backfill and the like.
The present invention tested the thermal conductivity of porous materials and existing porous concretes, e.g., two aerated concretes, three foamed concretes and two lightweight aggregate concretes, at different dry densities, and compared the test results, as shown in fig. 4. Obviously, under the condition of the same dry density, the porous material has lower heat conductivity coefficient and better heat preservation effect.
In summary, the beneficial effects of the present invention may include:
(1) The waste mud is used for preparing the porous material, so that the current situation that the disposal of the waste mud is difficult is solved.
(2) The process is simple, no special processing method is needed for preparation, and only stirring maintenance is needed.
(3) The pore structure is controllable, can be distributed in a nano-to-micron level and width, and can be distributed in a nano range in a concentrated way.
(4) Good flame resistance, low cost and good safety.
(5) The porous material based on the building waste mud has the advantages of low heat conductivity and fixed density grade, and can promote the development of high-performance heat insulation materials.
Although the present invention has been described above by way of the combination of the exemplary embodiments, it should be apparent to those skilled in the art that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined in the appended claims.
Claims (7)
1. A method for preparing a porous material from construction waste mud, which is characterized by comprising the following steps:
wet grinding treatment is carried out on the construction waste slurry, and a thickening agent is added to obtain first slurry; the time for adding the thickener is before, during or after wet grinding, and the mass ratio of the solid phase in the building waste slurry to the thickener is 1:0.001 to 0.02;
mixing the first slurry with cement or cement slurry, and uniformly stirring to obtain second slurry;
curing and drying the second slurry to obtain a porous material;
the construction waste mud comprises the following components in percentage by mass: 40 to 96.95 percent of water, 2 to 20 percent of bentonite particles, 1 to 10 percent of clay particles, 0 to 20 percent of sand and 0.05 to 10 percent of additive;
the granularity of solid phase particles in the first slurry is below 75 mu m; the solid phase content in the first slurry is 2.05-60%;
the mass ratio of the first slurry to the cement is 1:0.2 to 1; the volume ratio of the first slurry to the cement slurry is 1: 0.1-4, wherein the cement slurry comprises 50-75% of cement.
2. The method of preparing a porous material from construction waste mud according to claim 1, wherein the thickener comprises one or more of polyacrylamide, carrageenan, guar gum, cellulose ether, redispersible latex powder and carboxymethyl cellulose.
3. The method of preparing a porous material from construction waste mud of claim 1, wherein the construction waste mud comprises engineering mud discharged from construction engineering.
4. The method for preparing porous materials from construction waste mud according to claim 1, wherein the relative humidity is 45-95% and the temperature of the environment is 5-40 ℃ during the curing process.
5. A porous material based on construction waste sludge, characterized in that it comprises a material prepared by the method for preparing a porous material from construction waste sludge according to any one of claims 1 to 4.
6. The construction waste mud-based porous material according to claim 5, wherein the volume of pores in the porous material is 20-88%.
7. The construction waste mud-based porous material according to claim 6, wherein the pore volume of the porous material is 40 to 100% of the total pore volume, and the pore volume of the porous material is 0 to 60% of the total pore volume, wherein the pore volume is 100nm to 1 μm.
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| KR100731956B1 (en) * | 2005-12-28 | 2007-06-25 | 전북대학교산학협력단 | Manufacturing method of insulating building material |
| CH703868B1 (en) * | 2010-09-16 | 2016-06-15 | Creabeton Matériaux Sa | Building material and construction system element and method of making same. |
| CN109020349A (en) * | 2018-09-29 | 2018-12-18 | 四川建筑职业技术学院 | A kind of preparation method of sludge base foaming building materials |
| CN109592938B (en) * | 2018-12-28 | 2021-09-03 | 西南科技大学 | Cement-based nano porous material and preparation method thereof |
| CN112723906A (en) * | 2021-01-21 | 2021-04-30 | 宁波大学 | Preparation and construction method of light filler based on building slurry |
| CN113416033A (en) * | 2021-03-11 | 2021-09-21 | 江苏洋河新城新材料有限责任公司 | Dredged sludge non-sintered ceramsite and preparation method thereof |
| CN114085053A (en) * | 2021-11-11 | 2022-02-25 | 同济大学 | Waste building residue soil slurry base baking-free early-strength lightweight aggregate and preparation method thereof |
| CN114368925A (en) * | 2022-01-27 | 2022-04-19 | 青岛理工大学 | Method for preparing lightweight aggregate by using engineering mud |
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| CN101314536A (en) * | 2008-07-03 | 2008-12-03 | 华南理工大学 | Energy-conservation environment-friendly type EPS light aggregate concrete and manufacture method thereof |
| AU2020101154A4 (en) * | 2020-06-26 | 2020-07-30 | Qian'an Weisheng Solid Waste Environmental Protection Industry Co., Ltd | A Cementitious Material, A Concrete Prepared And Its Preparation Method |
| CN112408876A (en) * | 2020-11-09 | 2021-02-26 | 西南科技大学 | Cement-based porous material based on silicon dioxide and preparation method thereof |
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