CN113754364B - Artificial aggregate based on muck sand washing tail mud and preparation method thereof - Google Patents
Artificial aggregate based on muck sand washing tail mud and preparation method thereof Download PDFInfo
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- CN113754364B CN113754364B CN202111091124.1A CN202111091124A CN113754364B CN 113754364 B CN113754364 B CN 113754364B CN 202111091124 A CN202111091124 A CN 202111091124A CN 113754364 B CN113754364 B CN 113754364B
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- artificial aggregate
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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
- 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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- 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
Abstract
The invention belongs to the technical field of building materials, and provides an artificial aggregate based on muck sand washing tail mud, which comprises the following components in parts by weight: 50-80 parts of slag soil sand washing tail mud, 10-20 parts of adhesive, 0.5-1 part of water reducing agent and 10-50 parts of water. The artificial aggregate is prepared by taking the tailings of the slag soil sand washing as a raw material, and the tailings after the engineering slag soil sand washing are utilized, so that the problem of resource waste caused by stacking of the tailings is solved; the tailings after the sand washing of the muck is solidified by adding the adhesive, and the chemical stability of the tailings is positively influenced, so that the strength of the artificial aggregate is improved; the water reducing agent is added to reduce the water consumption, so that the strength reduction caused by excessive water consumption is avoided, and the strength of the artificial aggregate is further ensured. The results of the examples show that the compressive strength of the single artificial aggregate based on the muck sand-washing tailing mud is 1-5 MPa, and the barrel pressure strength is 2.8-3.6 MPa.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an artificial aggregate based on muck sand washing tail mud and a preparation method thereof.
Background
In recent years, in the rapid development process of urbanization in China, a large amount of engineering muck and abandoned soil are generated in urban underground engineering construction (such as subways and underground space structures), foundation pit excavation (such as high-rise buildings) and the like, most of the engineering muck and abandoned soil are low-harm naturally-formed substances and are rich in gravel and clay minerals, the gravel can be used for building sand through washing, the washed tail mud is mainly subjected to centralized landfill treatment, a landfill site constructed by consuming a large amount of land resources cannot meet the requirement of tail mud stacking in terms of quantity and capacity, and transport cost generated by soil transport also causes huge burden to economy.
Meanwhile, with the shortage of resources, the exploitation of natural sandstone is reduced, and very important environmental and social benefits are achieved. The development of the existing artificial recycled aggregate technology solves the problem that the ecological environment is increasingly deteriorated nowadays, and can reduce the consumption of resources in the construction industry, thereby reducing the exploitation of natural sand and protecting the living environment of human beings. The existing artificial recycled aggregate is usually the aggregate obtained by recycling construction waste, the surface of the aggregate is coated with cement mortar, and the aggregate has poor internal performance and low strength. Therefore, how to prepare the artificial aggregate with high strength by using the tailings after the dregs are washed with sand becomes a technical problem which needs to be solved for treating the tailings and improving the strength of the conventional artificial recycled aggregate.
Disclosure of Invention
The artificial aggregate based on the waste soil sand washing tail mud utilizes the waste soil sand washing tail mud, solves the problem of resource waste caused by tail mud stacking, and simultaneously obtains the artificial aggregate with high compressive strength.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides an artificial aggregate based on muck sand washing tail mud, which comprises the following components in parts by weight:
50-80 parts of slag soil sand washing tail mud, 10-20 parts of adhesive, 0.5-1 part of water reducing agent and 10-50 parts of water.
Preferably, the artificial aggregate based on the muck sand-washing tailing mud comprises the following components in parts by weight: 60-70 parts of slag soil sand washing tail mud, 10-15 parts of adhesive, 0.5-0.8 part of water reducing agent and 20-50 parts of water.
Preferably, the binder comprises one or more of portland cement, alkali-activated cement, and phosphate cement.
Preferably, the water reducer comprises a polycarboxylic acid water reducer.
Preferably, the water content of the residue soil sand washing tail mud is less than 20%.
Preferably, the particle size of the artificial aggregate is 0.5 to 10mm.
The invention also provides a preparation method of the artificial aggregate based on the muck sand-washing tailing mud, which comprises the following steps: mixing the residue soil sand washing tail mud, an adhesive, a water reducing agent and water, and then molding to obtain artificial aggregate; and when the particle size of the artificial aggregate obtained after the molding is less than 0.5mm, recycling.
Preferably, the shaping comprises crushing or granulating.
Preferably, the method further comprises a curing treatment and a carbonization treatment which are sequentially carried out after the forming.
Preferably, the concentration of the carbon dioxide subjected to carbonization treatment is more than or equal to 95 percent; the carbonization time is 0.5-2 h.
The invention provides an artificial aggregate based on muck sand washing tail mud, which comprises the following components in parts by weight: 50-80 parts of slag soil sand washing tail mud, 10-20 parts of adhesive, 0.5-1 part of water reducing agent and 10-50 parts of water. The artificial aggregate is prepared by taking the tailings of the slag soil sand washing as a raw material, and the tailings after the engineering slag soil sand washing are utilized, so that the problem of resource waste caused by stacking of the tailings is solved; the tailings after the sand washing of the muck is solidified by adding the adhesive, and the chemical stability of the tailings is positively influenced, so that the strength of the artificial aggregate is improved; the water reducing agent is added to reduce the water consumption, so that the strength reduction caused by excessive water consumption is avoided, and the strength of the artificial aggregate is further ensured. The results of the examples show that the compressive strength of the single artificial aggregate based on the muck sand-washing tailing mud is 1-5 MPa, and the barrel pressure strength is 2.8-3.6 MPa.
Drawings
FIG. 1 is a process flow diagram of a preparation method of an artificial aggregate based on muck sand-washing tail mud provided by the invention;
FIG. 2 is a diagram of a material object of the tailings of the residue soil sand washing used in example 1 of the present invention;
FIG. 3 is a schematic representation of an artificial aggregate prepared in example 1 of the present invention;
FIG. 4 is a diagram showing an embodiment of the artificial aggregate prepared in example 2 of the present invention.
Detailed Description
The invention provides an artificial aggregate based on muck sand washing tail mud, which comprises the following components in parts by weight:
50-80 parts of slag soil sand washing tail mud, 10-20 parts of adhesive, 0.5-1 part of water reducing agent and 10-50 parts of water.
The artificial aggregate based on the muck washing tailing mud comprises, by weight, 50-80 parts of muck washing tailing mud, and preferably 60-70 parts of muck washing tailing mud. The artificial aggregate is prepared by taking the tailings of the slag soil sand washing as a raw material, and the tailings after the engineering slag soil sand washing are utilized, so that the problem of resource waste caused by stacking of the tailings is solved.
In the invention, the water content of the residue soil sand washing tail mud is preferably less than 20%. In the invention, the muck sand-washing tail mud has pH buffering capacity. The source of the tailings from the residue soil sand washing is not particularly limited, and the tailings from the sand washing plant, which are well known to those skilled in the art, can be used.
The artificial aggregate based on the muck washing tailing mud comprises 10-20 parts of adhesive, preferably 10-15 parts, calculated by 50-80 parts of the muck washing tailing mud by mass. The invention solidifies the dregs washed sand tail mud by adding the adhesive, and plays a positive role in the chemical stability of the tail mud, thereby improving the strength of the artificial aggregate.
In the present invention, the binder preferably includes one or more of portland cement, alkali-activated cement, and phosphate cement, and more preferably portland cement or alkali-activated cement. The source of the adhesive is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used.
The artificial aggregate based on the slag soil sand washing tail mud comprises 0.5-1 part of water reducing agent, preferably 0.5-0.8 part, calculated by 50-80 parts of the slag soil sand washing tail mud. The water reducing agent is added to reduce the water consumption, so that the strength reduction caused by excessive water consumption is avoided, and the strength of the artificial aggregate is further ensured.
In the present invention, the water reducing agent comprises a polycarboxylic acid water reducing agent. The source of the water reducing agent is not particularly limited in the present invention, and a commercially available product well known to those skilled in the art can be used.
The artificial bone material based on the slag soil sand washing tail mud comprises, by mass, 50-80 parts of water, preferably 20-50 parts of water. In the present invention, the water is used for mixing other components.
In the present invention, the particle size of the artificial aggregate is preferably 0.5 to 10mm, more preferably 1 to 8mm.
The artificial aggregate is prepared by taking the tailings of the slag soil sand washing as a raw material, and the tailings after the engineering slag soil sand washing are utilized, so that the problem of resource waste caused by stacking of the tailings is solved; the tailings after the sand washing of the muck is solidified by adding the adhesive, and the chemical stability of the tailings is positively influenced, so that the strength of the artificial aggregate is improved; the water reducing agent is added to reduce the water consumption, so that the strength reduction caused by excessive water consumption is avoided, and the strength of the artificial aggregate is further ensured.
The invention also provides a preparation method of the artificial aggregate based on the muck sand-washing tail mud, which comprises the following steps: mixing the residue soil sand washing tail mud, an adhesive, a water reducing agent and water, and then molding to obtain artificial aggregate; and when the particle size of the artificial aggregate obtained after the molding is less than 0.5mm, recycling.
The method mixes the muck sand washing tail mud, the adhesive, the water reducing agent and the water to obtain a mixture. The mixture of the muck sand washing tail mud, the adhesive, the water reducer and the water is not particularly limited, and the mixing mode known by the technicians in the field is adopted.
After the mixture is obtained, the mixture is molded to obtain the artificial aggregate.
In the present invention, the forming means preferably includes pulverization or granulation.
In the present invention, it is preferable that the pulverization further includes casting. The invention forms the mixture into the building block through pouring, which is convenient for crushing. The casting method is not particularly limited, and a casting method known to those skilled in the art can be used.
In the present invention, the pulverization is preferably mechanical pulverization. In the present invention, the shape of the artificial aggregate obtained by the molding method by pulverization is preferably irregular.
The granulation method of the present invention is not particularly limited, and granulation methods known to those skilled in the art may be used. In the present invention, the granulating device is preferably a spheronizer. In the present invention, the shape of the artificial aggregate obtained by the molding method of granulation is preferably spherical.
In the invention, when the particle size of the artificial aggregate obtained after the molding is less than 0.5mm, the artificial aggregate is recycled. The artificial aggregate prepared by the technical scheme provided by the invention can be reused in the preparation process of the aggregate when the particle size of the aggregate is less than 0.5mm, so that the effects of saving raw materials and reducing energy consumption are achieved, and the aggregate with the undersize particle size generated in the generation process of the conventional preparation method of the artificial aggregate cannot be reused and becomes waste, thereby causing the waste of the raw materials.
In the present invention, it is preferable that the method further comprises a curing treatment and a carbonization treatment which are sequentially performed after the molding. The invention improves the chemical stability and strength of the artificial aggregate through maintenance treatment and carbonization treatment, and simultaneously solidifies carbon dioxide.
The curing method of the present invention is not particularly limited, and concrete curing methods known to those skilled in the art may be used. In the present invention, the curing treatment time is preferably 1 to 3 days. The curing treatment time of the invention is short, the curing time is 1-3 days, which can reach more than 90% of the aggregate strength of the aggregate after the conventional curing for 28 days, and the manufacturing period is greatly shortened.
In the present invention, the carbonization treatment is preferably performed at normal temperature and pressure; the humidity of the carbonization treatment is preferably 40-60%; the concentration of the carbon dioxide subjected to carbonization treatment is preferably more than or equal to 95 percent; the time for the carbonization treatment is preferably 0.5 to 2 hours.
The process flow diagram of the preparation method of the artificial aggregate based on the muck sand washing tail mud is shown in figure 1, the engineering muck is washed to obtain the building sand and the tail mud, the additive consisting of the adhesive and the water reducing agent and the water are mixed to prepare a mixture, then the mixture is granulated to obtain the spherical artificial aggregate, or the mixture is poured to form a building block and then crushed to obtain the irregular artificial aggregate, the generated powder particles or the aggregate with the too small particle size are recycled, and finally the artificial aggregate is obtained through maintenance treatment and carbonization treatment.
According to the preparation method of the artificial aggregate based on the muck sand washing tail mud, the artificial aggregate can be obtained by mixing the components and then molding, and the operation is simple.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the 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.
Example 1
The particle size of the artificial aggregate is 0.5-10 mm;
the components (parts by weight): 75 parts of slag soil sand washing tail mud, 12 parts of Portland cement, 0.8 part of polycarboxylic acid water reducing agent and 26 parts of water;
the preparation method comprises the following steps:
(1) Mixing the residue soil sand washing tail mud, portland cement, a polycarboxylic acid water reducing agent and water to obtain a mixture;
(2) Pouring the mixture to obtain a building block;
(3) Mechanically crushing the building blocks, maintaining for 2 days, and carbonizing at normal temperature and pressure for 0.5h under the conditions of 50% of humidity and 98% of carbon dioxide concentration to obtain artificial aggregate; wherein, the artificial aggregate with the grain diameter less than 0.5mm is reused in the step (1).
Fig. 2 is a real object diagram of the tailings of the residue sand washing used in the present embodiment.
FIG. 3 is a diagram showing an embodiment of the artificial aggregate prepared in this example. As can be seen from fig. 3, the artificial aggregate prepared in this example was an irregular artificial aggregate with edges and corners.
Example 2
The particle size of the artificial aggregate is 1-6 mm;
the components (parts by weight): 70 parts of slag soil sand washing tail mud, 15 parts of Portland cement, 0.6 part of polycarboxylic acid water reducing agent and 12 parts of water;
the preparation method comprises the following steps:
(1) Mixing the residue soil sand washing tail mud, portland cement, a polycarboxylic acid water reducing agent and water to obtain a mixture;
(2) Placing the mixture in a spheronization granulator, granulating, maintaining for 2 days, and carbonizing for 0.5h under the conditions of normal temperature and pressure, humidity of 50% and carbon dioxide concentration of 98% to obtain artificial aggregate; wherein, the artificial aggregate with the grain diameter less than 0.5mm is reused in the step (1).
FIG. 4 is a diagram showing an embodiment of the artificial aggregate prepared in this example. As can be seen from fig. 4, the artificial aggregate prepared in this example was spherical.
Example 3
The particle size of the artificial aggregate is 2-10 mm;
the components (parts by weight): 70 parts of residue soil sand washing tail mud, 15 parts of alkali-activated cement, 0.6 part of polycarboxylic acid water reducing agent and 17 parts of water;
the preparation method comprises the following steps:
(1) Mixing the residue soil sand washing tail mud, portland cement, a polycarboxylic acid water reducing agent and water to obtain a mixture;
(2) Placing the mixture in a spheronization granulator, granulating, maintaining for 2 days, and carbonizing for 0.5h under the conditions of normal temperature and pressure, humidity of 50% and carbon dioxide concentration of 98% to obtain artificial aggregate; wherein, the artificial aggregate with the grain diameter less than 0.5mm is reused in the step (1).
TABLE 1 Properties of Artificial aggregates prepared in examples 1 to 3
As can be seen from the above examples, the artificial aggregate based on the muck sand-washing tailing mud provided by the invention has excellent compressive strength, the compressive strength of a single artificial aggregate is 1-5 MPa, the cylinder pressure strength is 2.8-3.6 MPa, and the water absorption is lower than 35%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. An artificial aggregate based on muck sand washing tail mud comprises the following components in parts by weight:
60-70 parts of slag soil sand washing tail mud, 10-15 parts of adhesive, 0.5-0.8 part of water reducing agent and 20-50 parts of water;
the preparation method of the artificial aggregate based on the muck sand-washing tail mud comprises the following steps: mixing the residue soil sand washing tail mud, an adhesive, a water reducing agent and water, and then molding to obtain artificial aggregate; when the particle size of the artificial aggregate obtained after the molding is less than 0.5mm, recycling;
the molding process comprises the steps of sequentially carrying out maintenance treatment and carbonization treatment;
the time of the maintenance treatment is 1 to 3 days;
the concentration of the carbon dioxide subjected to carbonization treatment is more than or equal to 95 percent; the time of the carbonization treatment is 0.5h.
2. The artificial aggregate based on the muck wash tailing mud according to claim 1, wherein the binder comprises one or more of portland cement, alkali-activated cement, and phosphate cement.
3. The artificial aggregate based on the muck wash tailing mud according to claim 1, wherein the water reducer comprises a polycarboxylic acid water reducer.
4. The artificial aggregate based on the muck washing tailing mud according to claim 1, characterized in that the water content of the muck washing tailing mud is < 20%.
5. The artificial aggregate based on the muck-washing tailing mud according to claim 1, characterized in that the particle size of the artificial aggregate is 0.5-10 mm.
6. The method for preparing the artificial aggregate based on the muck washing tailing mud of any one of claims 1 to 5, which comprises the following steps: mixing the residue soil sand washing tail mud, an adhesive, a water reducing agent and water, and then molding to obtain artificial aggregate; when the particle size of the artificial aggregate obtained after the molding is less than 0.5mm, recycling;
the molding process comprises the steps of sequentially carrying out maintenance treatment and carbonization treatment;
the time of the maintenance treatment is 1 to 3 days;
the concentration of the carbon dioxide subjected to carbonization treatment is more than or equal to 95 percent; the carbonization time is 0.5h.
7. The method of claim 6, wherein the forming comprises pulverizing or granulating.
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| CN114956656B (en) * | 2022-06-08 | 2023-04-18 | 国发环保新材料(江门)有限公司 | Magnesium ore slag and sand washing residual mud artificial stone and preparation method thereof |
| CN115180858A (en) * | 2022-07-06 | 2022-10-14 | 华侨大学 | Improved soil manufacturing system and production method based on carbon dioxide fixation |
| CN115894074B (en) * | 2022-10-25 | 2024-02-06 | 上海建工建材科技集团股份有限公司 | Preparation method of mine fine tail mud-based baking-free lightweight aggregate |
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| CN111170669A (en) * | 2019-12-30 | 2020-05-19 | 同济大学 | Artificial recycled aggregate prepared from engineering waste soil and preparation method thereof |
| CN112194394A (en) * | 2020-09-14 | 2021-01-08 | 深圳大学 | Preparation method of artificial building aggregate based on sludge |
| CN112707685B (en) * | 2020-12-24 | 2022-07-12 | 深圳市华威环保建材有限公司 | Self-compacting concrete and preparation method thereof |
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