CN110330282B - Composite cementing material and preparation method and application thereof - Google Patents
Composite cementing material and preparation method and application thereof Download PDFInfo
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- CN110330282B CN110330282B CN201910674391.8A CN201910674391A CN110330282B CN 110330282 B CN110330282 B CN 110330282B CN 201910674391 A CN201910674391 A CN 201910674391A CN 110330282 B CN110330282 B CN 110330282B
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00181—Mixtures specially adapted for three-dimensional printing (3DP), stereo-lithography or prototyping
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a composite cementing material and a preparation method and application thereof, relating to the technical field of novel building materials. The composite cementing material comprises solid powder and liquid materials, wherein the solid powder comprises red mud, hydraulic cementing materials, admixtures, aggregates and water reducing agents, and the liquid materials comprise aqueous solutions of alkali activators. The composite cementing material prepared from the raw materials improves the compressive strength and the flexural strength of a 3D printing building material by adding the red mud, and effectively solves the problems that the existing cement-based material has poor thixotropy and slow setting time and cannot be applied to 3D printing. Meanwhile, waste is changed into things of value, and the cost of 3D printing buildings is reduced.
Description
Technical Field
The invention relates to the technical field of novel building materials, in particular to a composite cementing material and a preparation method and application thereof.
Background
The red mud is polluting waste residue discharged when aluminum oxide is extracted in the aluminum industry, and generally 1.0-2.0 tons of red mud are additionally generated when 1 ton of aluminum oxide is produced on average. In recent years, with the continuous development of the aluminum industry, the red mud discharge amount is increased every year, however, the application technology which is relatively mature and can utilize the red mud on a large scale is lacked in the prior art, so that a large amount of red mud cannot be fully and effectively utilized, and can only be stacked by a large-area yard, thereby not only occupying a large amount of land, but also causing serious pollution to the environment.
3D printing is an innovative rapid prototyping process, and is used for printing a 3D pattern designed by a computer layer by layer through a 3D printer to construct an object. In recent years, more and more researchers have applied 3D printing to the field of construction, and houses, buildings, and the like are manufactured by 3D printing. However, most of the existing 3D printing building materials are mainly made of raw materials such as cement and sand, and the 3D printing building materials are rarely prepared by industrial solid wastes, so that the cost of the existing 3D printing building materials is high, and the popularization of the new technology is seriously influenced.
In view of the above, there is a need to research and develop a composite cementitious material capable of utilizing red mud on a large scale, and apply the composite cementitious material in the field of 3D printing buildings, so as to turn waste into wealth, reduce the pollution of red mud to the environment, save a large amount of materials such as cement, and reduce the cost of 3D printing buildings, and thus the composite cementitious material is certainly popular in the market.
Disclosure of Invention
The first purpose of the invention is to provide a composite cementing material, which not only improves the compression resistance of a 3D printing building material, but also effectively alleviates the problem that the existing cement-based material has poor thixotropy and cannot be applied to 3D printing in a manner of adding red mud.
The second purpose of the invention is to provide a preparation method of the composite cementing material, and the preparation method has the advantages of simple preparation process, simple and convenient operation, easy implementation, no need of special processing equipment in the preparation process and the like.
The third purpose of the invention is to provide an application of the composite cementing material, and the composite cementing material can be widely applied to the field of preparation of 3D printing buildings.
The invention provides a composite cementing material, which comprises a solid powder material and a liquid material, wherein: the solid powder comprises red mud, hydraulic cementing material, admixture, aggregate and water reducing agent; the liquid material comprises an aqueous solution of an alkali-activator.
Further, the solid powder mainly comprises the following components in percentage by mass: 15-25 wt% of red mud, 0-7 wt% of hydraulic binder, 9-25 wt% of admixture, 45-75 wt% of aggregate and 1-5 wt% of water reducer.
Further, the aqueous solution of the alkali-activating agent mainly comprises the following components in percentage by mass: 20-25 wt% of alkali activator and 75-80 wt% of water;
preferably, the aqueous solution of the alkali-activator mainly comprises the following components in percentage by mass: 22-24 wt% of alkali activator and 76-78 wt% of water;
more preferably, the alkali-activator is sodium silicate.
Further, the mass ratio of the solid powder to the liquid material is (80-120): (16-20), preferably 100: (16-20).
Further, the hydraulic gelling material comprises at least one of portland cement, sulphoaluminate cement and ferro-aluminate cement;
preferably, the hydraulic gelling agent is 42.5# Portland cement.
Further, the admixture comprises at least one of fly ash, lime powder and steelmaking water-quenching slag;
preferably, the admixture is fly ash.
Preferably, the aggregate comprises at least one of iron tailings, nickel tailings, copper tailings and river sand;
more preferably, the aggregate is iron tailings.
Further, the water reducing agent comprises at least one of naphthalene water reducing agents, and is preferably an FDN water reducing agent.
The invention provides a preparation method of the composite cementing material, which comprises the following steps:
and uniformly mixing the solid powder and the liquid material to obtain the composite gel material.
Further, the preparation method comprises the following steps:
(a) mixing the red mud, the hydraulic cementing material, the admixture aggregate and the water reducing agent to obtain solid powder;
(b) dissolving an alkali activator in water to obtain a liquid material;
(c) uniformly mixing the solid powder obtained in the step (a) with the liquid material obtained in the step (b) to obtain a composite cementing material;
the order of steps (a) and (b) may be reversed;
preferably, before the mixed powder is prepared in the step (a), the method further comprises the step of respectively crushing the red mud, the hydraulic binder, the admixture and the aggregate.
The invention provides an application of the composite cementing material in preparation of a 3D printing building.
Compared with the prior art, the invention has the beneficial effects that:
the composite cementing material provided by the invention comprises solid powder and liquid materials, wherein the solid powder comprises red mud, a hydraulic cementing material, a blending material, aggregate and a water reducing agent, and the liquid materials comprise an aqueous solution of an alkali activator. The composite cementing material prepared from the raw materials improves the compressive strength and the flexural strength of a 3D printing building material by adding the red mud, and effectively solves the problems that the existing cement-based material has poor thixotropy and slow setting time and cannot be applied to 3D printing. Meanwhile, waste is changed into things of value, and the cost of 3D printing buildings is reduced.
According to the preparation method of the composite gel material, provided by the invention, the red mud, the hydraulic gel material, the admixture, the aggregate, the water reducing agent and the aqueous solution of the alkali activator are uniformly mixed to obtain the composite gel material. The preparation method has the advantages of simple preparation process, simple and convenient operation, easy implementation, no need of special processing equipment in the preparation process and the like.
The composite cementing material provided by the invention can be widely applied to the field of preparation of 3D printing buildings.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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.
According to one aspect of the present invention, a composite cementitious material comprises a solid powder and a liquid material, wherein:
the solid powder comprises red mud, hydraulic cementing material, admixture, aggregate and water reducing agent;
the liquid material comprises an aqueous solution of an alkali-activator.
The composite cementing material provided by the invention comprises solid powder and liquid materials, wherein the solid powder comprises red mud, a hydraulic cementing material, a blending material, aggregate and a water reducing agent, and the liquid materials comprise an aqueous solution of an alkali activator. The composite cementing material prepared from the raw materials improves the compressive strength and the flexural strength of a 3D printing building material by adding the red mud, and effectively solves the problems that the existing cement-based material has poor thixotropy and slow setting time and cannot be applied to 3D printing. Meanwhile, waste is changed into things of value, and the cost of 3D printing buildings is reduced.
In a preferred embodiment of the present invention, the solid powder material mainly comprises the following components by mass percent: 15-25 wt% of red mud, 0-7 wt% of hydraulic binder, 9-25 wt% of admixture, 45-75 wt% of aggregate and 1-5 wt% of water reducer.
Typical but non-limiting preferred embodiments of the red mud described above are: 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20wt%, 21 wt%, 22 wt%, 23wt%, 24 wt% and 25 wt%; typical but non-limiting preferred embodiments of the above hydraulic cements are: 0wt%, 1wt%, 2 wt%, 3wt%, 4wt%, 5 wt%, 6wt% and 7 wt%; typical but non-limiting preferred embodiments of the above blend are: 9 wt%, 10 wt%, 12 wt%, 15 wt%, 18 wt%, 20wt%, 22 wt% and 25 wt%; typical but non-limiting preferred embodiments of the above aggregate are: 45 wt%, 50 wt%, 55 wt%, 60 wt%, 65 wt%, 70 wt% and 75 wt%; typical but non-limiting preferred embodiments of the above water reducing agent are: 1wt%, 2 wt%, 3wt%, 4wt% and 5 wt%;
the sum of the red mud, the hydraulic cementing material, the admixture, the aggregate, the water reducing agent and the optional auxiliary agent in the solid powder is 100 wt%.
In a preferred embodiment of the present invention, the aqueous solution of the alkali-activator consists essentially of the following components in percentage by mass: 20-25 wt% of alkali activator and 75-80 wt% of water;
the sum of the alkali-activator, water and optional auxiliary agents in the aqueous solution of the alkali-activator is 100 wt%.
Typical but non-limiting preferred embodiments of the above-mentioned alkali activators are: 20wt%, 21 wt%, 22 wt%, 23wt%, 24 wt% and 25 wt%; typical but non-limiting preferred embodiments of the above water are: 75 wt%, 76 wt%, 77wt%, 78 wt%, 79 wt% and 80 wt%.
Preferably, the aqueous solution of the alkali-activator mainly comprises the following components in percentage by mass: 22-24 wt% of alkali activator and 76-78 wt% of water;
in the invention, the technical effect of the composite cementing material is further optimized by further adjusting and optimizing the dosage proportion of the raw materials of each component.
More preferably, the alkali-activator is sodium silicate.
In a preferred embodiment, the alkali activator is sodium silicate, which is commonly called natron and water glass, and is a water-soluble silicate. The sodium silicate can fix alkali in the cementing material, and the durability of the cementing material is improved.
In a preferred embodiment of the present invention, the modulus of the sodium silicate aqueous solution (water glass) is 1.3 to 2.3. As a preferred embodiment, the modulus of the sodium silicate aqueous solution is selected to effectively improve the mechanical properties of the cementing material, and the mechanical properties of the cementing material are greatly influenced by over-high or over-low modulus.
Typical but non-limiting preferred embodiments of the above-mentioned water glass modulus are: 1.3, 1.5, 1.8, 2.0, 2.1 and 2.3.
In a preferred embodiment of the invention, the mass ratio of the solid powder to the liquid material is (80-120): (16-20), preferably 100: (16-20).
The mass ratio of the solid powder to the liquid material is typically, but not limited to, the preferred embodiment: 80: 16. 80: 18. 80: 20. 100, and (2) a step of: 16. 100, and (2) a step of: 18. 100, and (2) a step of: 20. 120: 16. 120: 18 and 120: 20.
as a preferable embodiment, the cementing material obtained by compounding the solid powder and the liquid material according to the mass ratio has good strength and setting time, and can fully meet the requirements of 3D printing buildings.
In a preferred embodiment of the present invention, the hydraulic binder comprises at least one of portland cement, sulphoaluminate cement and ferro-aluminate cement;
in a preferred embodiment, the hydraulic binder includes at least one of portland cement, sulphoaluminate cement, and aluminoferrite cement. The sulphoaluminate cement and the iron aluminate cement are both quick-hardening cements, and the setting time of the cementing material can be effectively shortened after the sulphoaluminate cement and the iron aluminate cement are mixed with the silicate cement, so that the requirement of 3D printing construction on the thixotropy of the cementing material is met.
Preferably, the hydraulic gelling agent is a mixture of portland cement and sulphoaluminate cement;
preferably, the portland cement is 42.5# ordinary portland cement.
In a preferred embodiment of the invention, the admixture comprises at least one of fly ash, lime powder and steelmaking water-quenched slag;
as a preferable embodiment, the admixture comprises at least one of fly ash, lime powder and steelmaking water-quenching slag, and the particle size of the admixture is 100-200 um.
Typical but non-limiting preferred embodiments of the particle size of the above blend are: 100um, 120um, 140um, 160um, 180um, and 200 um.
Preferably, the admixture is fly ash.
Preferably, the aggregate comprises at least one of iron tailings, nickel tailings, copper tailings and river sand;
as a preferable embodiment, the aggregate comprises at least one of iron tailings, nickel tailings, copper tailings and river sand, and the particle size of the aggregate is 5-20 mm.
Typical but non-limiting preferred embodiments of the particle size of the above aggregate are: 5mm, 8mm, 10mm, 12mm, 15mm, 18mm and 20 mm.
More preferably, the aggregate is iron tailings.
In a preferred embodiment of the present invention, the water reducing agent comprises at least one of a naphthalene based water reducing agent;
in a preferred embodiment, the water reducing agent is at least one naphthalene-based superplasticizer. The naphthalene-based high-efficiency water reducing agent is a naphthalene sulfonate formaldehyde condensate, and has a strong dispersing effect on cement particles.
Preferably, the water reducing agent is an FDN water reducing agent. The main component of the FDN water reducing agent is a beta-naphthalenesulfonate formaldehyde condensation compound, has a strong dispersing effect, and does not generate a corrosion effect after being compounded with raw materials such as red mud, steel slag powder and the like.
According to one aspect of the present invention, a preparation method of the above composite cementitious material comprises the following steps:
and uniformly mixing the solid powder and the liquid material to obtain the composite gel material.
According to the preparation method of the composite gel material, provided by the invention, the solid powder and the liquid material are uniformly mixed to obtain the composite gel material. The preparation method has the advantages of simple preparation process, simple and convenient operation, easy implementation, no need of special processing equipment in the preparation process and the like.
In a preferred embodiment of the present invention, the preparation method comprises the steps of:
(a) mixing the red mud, the hydraulic cementing material, the admixture aggregate and the water reducing agent to obtain solid powder;
(b) dissolving an alkali activator in water to obtain a liquid material;
(c) uniformly mixing the solid powder obtained in the step (a) with the liquid material obtained in the step (b) to obtain a composite cementing material;
the order of steps (a) and (b) may be reversed;
in a preferred embodiment, the method further comprises the step of separately pulverizing the red mud, the hydraulic binder, the admixture and the aggregate before preparing the mixed powder in the step (a).
Preferably, the particle size of the aggregate is 2-5 mm;
preferably, the particle size of the red mud, the hydraulic cementing material and the admixture is 50-75 μm.
According to one aspect of the invention, the composite cementitious material is used for preparing a 3D printed building.
The composite cementing material provided by the invention can be widely applied to the field of preparation of 3D printing buildings.
The technical solution of the present invention will be further described with reference to examples and comparative examples.
Example 1
The composite cementing material for 3D printing buildings comprises solid powder and liquid materials in parts by weight, wherein:
the solid powder comprises the following components in percentage by mass: 15 wt% of red mud, 9 wt% of fly ash, 75 wt% of iron tailings and 1wt% of FDN water reducing agent;
the aqueous solution of the alkali activator comprises the following components in percentage by mass: 20wt% of sodium silicate and 80 wt% of water;
the mass ratio of the solid powder to the liquid material is 100: 16;
the preparation method of the composite cementing material for 3D printing construction comprises the following steps:
(a) mixing the red mud, the admixture, the aggregate and the FDN water reducing agent to obtain solid powder;
(b) and (b) uniformly mixing the solid powder obtained in the step (a) with an aqueous solution of an alkali activator to obtain the composite cementing material.
Example 2
The composite cementing material for 3D printing buildings comprises solid powder and liquid materials in parts by weight, wherein:
the solid powder comprises the following components in percentage by mass: 25 wt% of red mud, 7wt% of 42.5# ordinary portland cement, 9 wt% of fly ash, 58 wt% of iron tailings and 1wt% of FDN water reducing agent;
the aqueous solution of the alkali activator comprises the following components in percentage by mass: 25 wt% of sodium silicate and 75 wt% of water;
the mass ratio of the solid powder to the liquid material is 100: 20;
this example was prepared as in example 1.
Example 3
The composite cementing material for 3D printing buildings comprises solid powder and liquid materials in parts by weight, wherein:
the solid powder comprises the following components in percentage by mass: 18 wt% of red mud, 2 wt% of No. 42.5 ordinary portland cement, 14 wt% of fly ash, 65 wt% of iron tailings and 1wt% of FDN water reducing agent;
the aqueous solution of the alkali activator comprises the following components in percentage by mass: 22 wt% of sodium silicate and 78 wt% of water;
the mass ratio of the solid powder to the liquid material is 90: 18;
this example was prepared as in example 1.
Example 4
The composite cementing material for 3D printing buildings comprises solid powder and liquid materials in parts by weight, wherein:
the solid powder comprises the following components in percentage by mass: 22 wt% of red mud, 5 wt% of 42.5# ordinary portland cement, 9 wt% of fly ash, 63 wt% of iron tailings and 1wt% of FDN water reducing agent;
the aqueous solution of the alkali activator comprises the following components in percentage by mass: 24 wt% of sodium silicate and 76 wt% of water;
the mass ratio of the solid powder to the liquid material is 120: 20;
this example was prepared as in example 1.
Example 5
The composite cementing material for 3D printing buildings comprises solid powder and liquid materials in parts by weight, wherein:
the solid powder comprises the following components in percentage by mass: 20wt% of red mud, 4wt% of 42.5# ordinary portland cement, 9 wt% of fly ash, 66wt% of iron tailings and 1wt% of FDN water reducing agent;
the aqueous solution of the alkali activator comprises the following components in percentage by mass: 23wt% of sodium silicate and 77wt% of water;
the mass ratio of the solid powder to the liquid material is 100: 18;
this example was prepared as in example 1.
Example 6
The composite cementing material for 3D printing buildings comprises solid powder and liquid materials in parts by weight, wherein:
the solid powder comprises the following components in percentage by mass: 30 wt% of red mud, 5 wt% of No. 42.5 ordinary portland cement, 4wt% of fly ash, 60 wt% of iron tailings and 1wt% of FDN water reducing agent;
the aqueous solution of the alkali activator comprises the following components in percentage by mass: 23wt% of sodium silicate and 77wt% of water;
the mass ratio of the solid powder to the liquid material is 100: 18;
this example was prepared as in example 1.
Example 7
The composite cementing material for 3D printing buildings comprises solid powder and liquid materials in parts by weight, wherein:
the solid powder comprises the following components in percentage by mass: 10 wt% of red mud, 5 wt% of No. 42.5 ordinary portland cement, 4wt% of fly ash, 80 wt% of iron tailings and 1wt% of FDN water reducing agent;
the aqueous solution of the alkali activator comprises the following components in percentage by mass: 23wt% of sodium silicate and 77wt% of water;
the mass ratio of the solid powder to the liquid material is 100: 18;
this example was prepared as in example 1.
Example 8
The composite cementing material for 3D printing buildings comprises solid powder and liquid materials in parts by weight, wherein:
the solid powder comprises the following components in percentage by mass: 25 wt% of red mud, 10 wt% of No. 42.5 ordinary portland cement, 4wt% of fly ash, 60 wt% of iron tailings and 1wt% of FDN water reducing agent;
the aqueous solution of the alkali activator comprises the following components in percentage by mass: 23wt% of sodium silicate and 77wt% of water;
the mass ratio of the solid powder to the liquid material is 100: 18;
this example was prepared as in example 1.
Example 9
The composite cementing material for 3D printing buildings comprises solid powder and liquid materials in parts by weight, wherein:
the solid powder comprises the following components in percentage by mass: 20wt% of red mud, 12 wt% of No. 42.5 ordinary portland cement, 9 wt% of lime powder, 58 wt% of nickel tailings and 1wt% of FDN water reducing agent;
the aqueous solution of the alkali activator comprises the following components in percentage by mass: 23wt% of sodium silicate and 77wt% of water;
the mass ratio of the solid powder to the liquid material is 100: 18;
the preparation method of the composite cementing material for 3D printing construction comprises the following steps:
(a) mixing the red mud, the hydraulic cementing material, the admixture aggregate and the FDN water reducing agent to obtain solid powder;
(b) and (b) uniformly mixing the solid powder obtained in the step (a) with an aqueous solution of an alkali activator to obtain the composite cementing material.
Example 10
The composite cementing material for 3D printing buildings comprises solid powder and liquid materials in parts by weight, wherein:
the solid powder comprises the following components in percentage by mass: 20wt% of red mud, 5 wt% of No. 42.5 ordinary portland cement, 20wt% of steelmaking water-quenched slag, 54 wt% of river sand and 1wt% of FDN water reducing agent;
the aqueous solution of the alkali activator comprises the following components in percentage by mass: 23wt% of sodium silicate and 77wt% of water;
the mass ratio of the solid powder to the liquid material is 100: 18;
the preparation method of the composite cementing material for 3D printing construction comprises the following steps:
(a) mixing the red mud, the hydraulic cementing material, the admixture aggregate and the FDN water reducing agent to obtain solid powder;
(b) and (b) uniformly mixing the solid powder obtained in the step (a) with an aqueous solution of an alkali activator to obtain the composite cementing material.
Experimental example 1
The invention not only has the effect of improving the compression resistance of 3D printing buildings, but also can effectively solve the problem that the existing cement-based material has poor thixotropy and cannot be applied to 3D printing. Now, the composite cementing materials prepared in the embodiments 1 to 10 of the present invention are tested for compressive strength and flexural strength, and the results are shown in the following table 1:
table 1: detection data of composite cementing materials in embodiments 1-10 of the invention
Therefore, the composite cementing material prepared by the invention greatly reduces the using amount of hydraulic cementing materials by adding red mud, not only improves the compression resistance of a 3D printing building and increases the compression resistance and the breaking strength of the 3D printing building, but also effectively solves the problems that the existing cement-based material has poor thixotropy and slow setting time and cannot be applied to 3D printing. Meanwhile, waste is changed into things of value, and the cost of 3D printing buildings is reduced. In particular, the compression strength of the cementing material prepared in the embodiment 1-5 of the invention is more than or equal to 32.5MPa in 28 days, and the breaking strength of the cementing material in 28 days is more than or equal to 8.3 MPa.
Experimental example 2
In order to show that the composite cementing material prepared by the invention has the characteristic of safe use, the composite cementing material prepared by the embodiments 1-5 is subjected to leaching toxicity detection, and is compared with the limit value of the American hazardous waste identification standard (EPA TCLP) and the national sanitary standard for drinking water (GB 5749 one-pack 2006), and the result is shown in Table 2:
table 2: detection result of leaching toxicity of composite cementing material in embodiments 1-5 of the invention
As can be seen from the above table, the composite gelled material prepared by the method has no leaching toxicity. Although the arsenic, mercury and lead contents in examples 1-5 are slightly higher than the limits of GB 5749-. The supervision limitation of EPA TCLP is more suitable for evaluating the main heavy metal residues such As As, Ba, Cd, Cr, Pb, Hg and the like in the cementing material, so that the extraction toxicity of the solid waste is verified. As can be seen from the above Table 2, the content of As, Ba, Cd, Cr, Pb and Hg in the composite cementitious materials prepared in examples 1 to 5 is far below the EPA TCLP limit, and particularly, the content of Hg is only 0.0015 to 0.002, which is far below the 0.2mg/L limit. Through analysis of EPA on mercury, the composite cementing material prepared by the method is extremely low in heavy metal leaching content and harmless to the environment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. The composite cementing material for 3D printing buildings is prepared from solid powder and liquid materials in parts by weight, wherein:
the solid powder comprises the following components in percentage by mass: 20wt% of red mud, 4wt% of No. 42.5 ordinary portland cement, 9 wt% of fly ash, 66wt% of iron tailings and 1wt% of FDN water reducing agent;
the liquid material is an aqueous solution of an alkali activator, and the aqueous solution of the alkali activator comprises the following components in percentage by mass: 23wt% of sodium silicate and 77wt% of water;
the mass ratio of the solid powder to the liquid material is 100: 18;
the preparation method of the composite cementing material for 3D printing construction comprises the following steps:
(a) mixing the red mud, the No. 42.5 ordinary portland cement, the fly ash, the iron tailings and the FDN water reducing agent to obtain solid powder;
(b) and (b) uniformly mixing the solid powder obtained in the step (a) with an aqueous solution of an alkali activator to obtain the composite cementing material.
2. The preparation method of the composite cementitious material for 3D printing construction according to claim 1, wherein before the solid powder is prepared in the step (a), the method further comprises the step of crushing red mud, 42.5# Portland cement, fly ash and iron tailings respectively.
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| CN110862254B (en) * | 2019-12-04 | 2022-08-12 | 湖南易兴建筑有限公司 | Ceramic cementing material and preparation method and application thereof |
| CN113087488A (en) * | 2020-01-08 | 2021-07-09 | 香港理工大学深圳研究院 | 3D printing material and preparation method thereof |
| CN113372032B (en) * | 2020-03-09 | 2023-10-17 | 博湃建筑科技（上海）有限公司 | Preparation method of light 3D printing building ink and geopolymer gel material thereof |
| CN113816681A (en) * | 2021-09-26 | 2021-12-21 | 上海国惠环境科技股份有限公司 | Formula of 3D printing building material composed of solid waste |
| CN113816717B (en) * | 2021-09-26 | 2022-06-24 | 中国地质大学（北京） | Mineral composite impermeable material, use method and impermeable fiber bag prepared from mineral composite impermeable material |
| CN114292082B (en) * | 2021-12-17 | 2022-09-23 | 山东高速集团有限公司 | Red mud-based stable material for roads and preparation method and application thereof |
| CN115925299B (en) * | 2022-12-28 | 2024-04-26 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | Full solid waste self-excitation alkaline cementing material and preparation method thereof |
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| CN103664085B (en) * | 2013-12-06 | 2016-09-14 | 中国科学院地球化学研究所 | Red mud-flyash aggretion type inorganic coagulation material and its preparation method and application |
| CN104878935B (en) * | 2015-04-17 | 2017-10-10 | 张彭成 | It is a kind of to control the concrete construction method and its special equipment of setting time |
| CN106082898B (en) * | 2016-06-16 | 2018-07-31 | 中国建筑股份有限公司 | Geopolymer composite material of 3D printing and its preparation method and application |
| CN106946513B (en) * | 2017-04-13 | 2018-03-20 | 黄波 | A kind of normal temperature solidified geopolymer and its application |
| CN107298546B (en) * | 2017-06-16 | 2019-08-30 | 南京理工大学 | Alkali-activated carbonatite cementitious material and its Method of printing for 3D printing |
| CN109721298B (en) * | 2019-02-27 | 2021-07-27 | 济南大学 | Red mud 3D printing alkali-activated cementing material and use method thereof |
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