CN112573892A - Concrete solid waste modified raw soil material and preparation method thereof - Google Patents
Concrete solid waste modified raw soil material and preparation method thereof Download PDFInfo
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- CN112573892A CN112573892A CN202011463936.XA CN202011463936A CN112573892A CN 112573892 A CN112573892 A CN 112573892A CN 202011463936 A CN202011463936 A CN 202011463936A CN 112573892 A CN112573892 A CN 112573892A
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- raw soil
- solid waste
- soil material
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Classifications
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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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
-
- 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
-
- 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 field of raw soil materials, and particularly relates to a concrete solid waste modified raw soil material and a preparation method thereof. The invention aims to solve the technical problem of providing a concrete solid waste modified raw soil material, which comprises the following raw materials in parts by mass: 400 to 700 portions of raw soil, 200 to 400 portions of waste residue powder, 100 to 200 portions of lithium residue powder, 0 to 20 portions of sisal fiber, 20 to 50 portions of alkaline activator and 100 to 300 portions of water. The raw soil material modified by the concrete solid waste has the advantages of high strength, no softening in water and the like.
Description
Technical Field
The invention belongs to the field of raw soil materials, and particularly relates to a concrete solid waste modified raw soil green environment-friendly material and a preparation method thereof.
Background
The commercial concrete is a building material with great consumption, and according to incomplete statistics, the commercial concrete is produced by 1m3The concrete will produce 0.01t of mixing plant waste residue (hereinafter referred to as waste residue) in average, and about 11700 ten thousand meters of waste residue produced in Sichuan province3And (4) calculating left and right concrete, at least 117 ten thousand of waste residues are generated every year. Raw soil is used as a building material, and has the defects of low material strength, low strength caused by softening in water and the like, so that the use of raw soil buildings is limited, and the service life of the raw soil buildings is seriously threatened. Therefore, how to treat raw soilThe modification of the raw soil material can enhance the mechanical property, water resistance and durability of the raw soil material and improve the service life of the raw soil building, and the modification becomes a problem which needs to be solved firstly in the raw soil material research.
CN104402350A discloses a method for modifying raw soil building materials and a method for preparing building blocks by utilizing the modified raw soil. The modified material for the raw soil building mainly comprises cement, lime, water glass, anhydrous calcium chloride and polypropylene fiber, and the modified material for the modified raw soil has the advantages of convenient material acquisition, economy, practicality, strong integrity, superior thermal property, simple operation and convenient implementation and popularization. However, the invention directly uses cement for modification, and the cement is easy to crack in the later period and is not green and environment-friendly.
In the existing building industry, an environment-friendly raw soil modification method is still lacked to meet the requirement of green and environment-friendly raw soil modification, and the development is urgently needed.
Disclosure of Invention
Aiming at the defects in the prior art, the raw soil is modified by adding the waste residues of the mixing plant and the like into the raw soil, and the raw soil material obtained after modification can be used as a novel wall material for modern rural construction.
The invention aims to solve the technical problem of providing a concrete solid waste modified raw soil material. The raw concrete material modified by the concrete solid wastes comprises the following raw materials in parts by mass: 400 to 700 portions of raw soil, 200 to 400 portions of waste residue powder, 100 to 200 portions of lithium residue powder, 0 to 20 portions of sisal fiber, 20 to 50 portions of alkaline activator and 100 to 300 portions of water.
Wherein, in the concrete solid waste modified raw soil material, the water content of the raw soil is lower than 1 wt%. The grain diameter is less than or equal to 2.5 mm.
In the concrete solid waste modified raw soil material, the waste residue is solid obtained by filter pressing of slurry water obtained after washing concrete in a commercial concrete mixing plant through a filter press.
Wherein, in the concrete solid waste modified raw soil material, the water content of the waste residue powder is lower than 1 wt%. The grain diameter is less than or equal to 2.5 mm.
Wherein, the concrete is solid waste modified raw soil materialThe specific surface area of the waste residue powder is 200-400 m2/kg。
In the concrete solid waste modified raw soil material, the lithium slag is waste slag formed after lithium is industrially refined from lithium ore.
In the concrete solid waste modified raw soil material, the particle size of the lithium slag powder is 200-400 meshes.
Wherein, in the concrete solid waste modified raw soil material, the impurity content of the sisal fibers is less than or equal to 3 percent, and the moisture regain is less than or equal to 8 percent.
Wherein, in the concrete solid waste modified raw soil material, the alkaline excitant is NaOH and Na2SiO3The mass ratio of the mixture is 0: 1-1: 1.
The invention also provides a preparation method of the concrete solid waste modified raw soil material. The preparation method comprises the following steps: mixing raw soil, waste residue powder, lithium residue powder and sisal fiber, adding aqueous solution of alkaline activator and water, stirring to form dry and hard mixture, placing in a mold, vibrating and tamping for molding.
The invention utilizes the waste residue of the mixing plant to have certain activity, and modifies the raw soil by matching with other modifiers, thereby overcoming the defects of lower strength, reduced strength caused by softening in water and the like of the traditional raw soil material. The modified raw soil material obtained by the invention can be used as a novel wall material for modern rural construction. The preparation method is simple and easy to implement, and the waste residue of the stirring station is added, so that the preparation method is low in manufacturing cost, green and environment-friendly, and can be widely popularized and applied according to local conditions.
The modified raw soil adopts the waste residue of the mixing plant, the reasonable utilization of the waste residue can help concrete enterprises to treat the waste water and the waste residue generated by the mixing plant, realize green production, really realize the aim of zero discharge of the waste residue of the premixing concrete mixing plant, and walk a healthy and sustainable development road to achieve the purposes of land saving, energy saving, material saving, water saving and environmental protection; the modified raw soil material can be used as a novel wall material for modern rural construction, and can be applied to the construction of new rural areas in China in large batch according to local conditions by combining the distribution condition of commercial concrete mixing plants.
Detailed Description
The raw soil material modified by concrete solid wastes comprises the following raw materials in parts by mass: 400 to 700 portions of raw soil, 200 to 400 portions of waste residue powder, 100 to 200 portions of lithium residue powder, 0 to 20 portions of sisal fiber, 20 to 50 portions of alkaline activator and 100 to 300 portions of water.
In the concrete solid waste modified raw soil material, the waste residue powder is obtained through the working procedures of natural air drying, screening, drying, grinding and the like.
Further, in the concrete solid waste modified raw soil material, the waste residue powder is obtained by the following method:
a. naturally drying the waste residues generated by the stirring station until the water content is lower than 5 wt%;
b. screening the waste residues of the stirring station with the water content of less than 5 wt% to obtain waste residues with the particle size of less than 70 mm;
c. drying the waste residue with the particle size of less than 70mm until the water content is less than 1 wt%, sieving, sorting the waste residue with the particle size of less than or equal to 2.5mm as a component A,
d. grinding the component A to obtain ground waste residue powder, wherein the specific surface area of the waste residue powder is 200-400 m2/kg。
Wherein, in the concrete solid waste modified raw soil material, the alkaline excitant is NaOH and Na2SiO3The mass ratio of the mixture is 0: 1-1: 1. NaOH is analytically pure, and its NaOH content is greater than 90.0%, and carbonate (using Na)2CO3Calculated) is less than 2 percent. Na (Na)2SiO3·9H2O is analytically pure, Na2O and SiO2The content ratio is 1.03 +/-0.05.
Wherein, in the concrete solid waste modified raw soil material, the water content of the raw soil is lower than 1 wt%. The grain diameter is less than or equal to 2.5 mm.
The invention also provides a preparation method of the concrete solid waste modified raw soil material. The preparation method comprises the following steps: mixing raw soil, waste residue powder, lithium residue powder and sisal fiber, adding an aqueous solution mixed by an alkaline activator and water, stirring to form a dry and hard mixture, putting the modified raw soil into a mold, and then vibrating and tamping for molding.
Comparative example 1
Putting 1000 parts by weight of raw soil and 200 parts by weight of water into a stirring pot in sequence for stirring, scraping a mixture adhered to the wall of the pot into the pot in the stirring and stopping process, and finally tamping and molding the raw soil mixture by combining a vibrating table with hand tamping.
Comparative example 2
The method comprises the following steps of sequentially putting 500 parts by weight of raw soil, 300 parts by weight of waste residue powder, 200 parts by weight of lithium residue powder and 200 parts by weight of water into a stirring pot for stirring according to the sequence of the raw soil, the waste residue powder, the lithium residue powder and the water, scraping a mixture adhered to the wall of the pot into the pot in the stirring and stopping process, and finally tamping and molding the raw soil mixture by combining a vibrating table with hand tamping.
Example 1
The method comprises the following steps of sequentially putting 500 parts by weight of raw soil, 300 parts by weight of waste residue powder, 200 parts by weight of lithium residue powder, 200 parts by weight of water and 20 parts by weight of excitant into a stirring pot for stirring according to the sequence of raw soil, waste residue powder, lithium residue powder and alkaline excitant solution (formed by fully stirring and mixing water and excitant), scraping a mixture adhered to the wall of the pot into the pot in the stirring and stopping process, and finally tamping and molding the raw soil mixture by combining a vibrating table and a hand.
Example 2
500 parts by weight of raw soil, 300 parts by weight of waste residue powder, 200 parts by weight of lithium residue powder, 200 parts by weight of water, 20 parts by weight of excitant and 10 parts by weight of sisal fiber, wherein the raw soil, the waste residue powder, the lithium residue powder and an alkaline excitant solution (formed by fully stirring and mixing water and the excitant) are sequentially put into a stirring pot for stirring, the sisal fiber is manually dispersed in a mixture in the stirring stop process, the mixture adhered to the wall of the pot is scraped into the pot, and finally, the raw soil mixture is dry and hard and is tamped and molded by combining a vibrating table and a hand tamping.
Example 3
600 parts of raw soil, 200 parts of waste residue powder, 200 parts of lithium residue powder, 200 parts of water, 20 parts of activator and 10 parts of sisal fiber, wherein the raw soil, the waste residue powder, the lithium residue powder and an alkaline activator solution (formed by fully stirring and mixing water and the activator) are sequentially put into a stirring pot for stirring, the sisal fiber is manually dispersed in a mixture in the stirring stop process, the mixture adhered to the wall of the pot is scraped into the pot, and finally, the raw soil mixture is dry and hard and is tamped and molded by combining a vibrating table with hand tamping.
Example 4
700 parts by weight of raw soil, 200 parts by weight of waste residue powder, 100 parts by weight of lithium residue powder, 200 parts by weight of water, 20 parts by weight of activator and 10 parts by weight of sisal fiber, wherein the raw soil, the waste residue powder, the lithium residue powder and an alkaline activator solution (formed by fully stirring and mixing water and the activator) are sequentially put into a stirring pot for stirring, the sisal fiber is manually dispersed in a mixture in the stirring stop process, the mixture adhered to the wall of the pot is scraped into the pot, and finally, the raw soil mixture is dry and hard and is tamped and molded by combining a vibrating table with hand tamping.
Results of mechanical Property testing
The mixture with the thickness of 40mm multiplied by 160mm is molded by a test die, the mixture is maintained in a maintenance box for 28 days in a standard way, the temperature is controlled to be 20 +/-2 ℃, the relative humidity is controlled to be 60-80 percent, and the flexural strength and the compressive strength of the mixture are measured after the mixture is maintained to be in a specified age, and the results are shown in the following table 1.
TABLE 1
| Number of groups | 28 days compressive strength (MPa) | 28 days rupture strength (MPa) |
| Comparative example 1 | 1.5 | 0.3 |
| Comparative example 2 | 15.2 | 1.3 |
| Example 1 | 20.3 | 2.1 |
| Example 2 | 19.2 | 3.2 |
| Example 3 | 18.6 | 1.9 |
| Example 4 | 16.3 | 1.7 |
As can be seen from the above table 1, the flexural strength and compressive strength of the raw soil are greatly improved when the raw soil is excited by adding the waste residue powder, the lithium residue powder and the alkaline activator, and the performance requirements of modern wall materials can be met; the addition of the sisal fibers can obviously improve the flexural strength and improve the crack resistance of the modified material, but the addition of the sisal fibers obviously degrades the compressive strength of the raw soil material, and the compressive strength is reduced to some extent but not greatly reduced; the specific proportion can be adjusted according to the use condition and the performance of the specific use part.
Water softening coefficient test results
The softening coefficient is measured by soaking a test block for testing the mechanical property for 28 days in water for 1 day and performing an experiment in a saturated dry state; k is F/F, and K is the softening coefficient of the material; f is the compressive strength (MPa) of the material in a water saturated state; f is the compressive strength (MPa) of the material in the dry state, the results are given in Table 2 below.
TABLE 2
| Number of groups | 28 days compressive strength (MPa) | 28 days rupture strength (MPa) | Coefficient of softening K |
| Comparative example 1 | 1.5 | 0.3 | Test block dispersed when meeting water |
| Comparative example 2 | 15.2 | 1.3 | 0.75 |
| Example 1 | 20.3 | 2.1 | 0.85 |
| Example 2 | 19.2 | 3.2 | 0.93 |
| Practice ofExample 3 | 18.6 | 1.9 | 0.89 |
| Example 4 | 16.3 | 1.7 | 0.87 |
From the above table 2, it can be known that, compared with the raw soil test block which is not doped with the modified material and is disintegrated when water, the raw soil added with the waste residue powder, the lithium residue powder, the sisal fiber and the alkaline activator can improve the water resistance of the raw soil material when excited, and from the examples 4, 3 and 2, the higher the weight ratio of the modified components is, the higher the softening coefficient is; from examples 1 and 2, it is known that the softening coefficient of the alkali-activator and the sisal fibers can be further improved; the main reason for the high water resistance of the modified raw soil material is that the added modified material contains activity, and the hydration product of the modified material plays a role of a skeleton in the raw soil material and binds soil particles together, so that the modified raw soil material has better water resistance.
Claims (9)
1. The concrete solid waste modified raw soil material is characterized in that: the raw materials comprise the following components in parts by mass: 400 to 700 portions of raw soil, 200 to 400 portions of waste residue powder, 100 to 200 portions of lithium residue powder, 0 to 20 portions of sisal fiber, 20 to 50 portions of alkaline activator and 100 to 300 portions of water.
2. The concrete solid waste modified raw soil material according to claim 1, wherein: the water content of the raw soil is lower than 1 wt%; furthermore, the grain diameter is less than or equal to 2.5 mm.
3. The concrete solid waste modified raw soil material according to claim 1, wherein: the waste residue is solid obtained by filter pressing of slurry water obtained after washing concrete in a commercial concrete mixing plant through a filter press.
4. The concrete solid waste modified raw soil material according to claim 1 or 3, wherein: the water content of the waste residue powder is lower than 1 wt%; furthermore, the grain diameter is less than or equal to 2.5 mm; the specific surface area is 200-400 m2/kg。
5. The concrete solid waste modified raw soil material according to claim 1, wherein: the lithium slag is formed after lithium is industrially refined from lithium ore.
6. The concrete solid waste modified raw soil material according to claim 1 or 5, wherein: the particle size of the lithium slag powder is 200-400 meshes.
7. The concrete solid waste modified raw soil material according to claim 1, wherein: the impurity content of the sisal fibers is less than or equal to 3%, and the moisture regain is less than or equal to 8%.
8. The concrete solid waste modified raw soil material according to claim 1, wherein: the alkaline activator is NaOH and Na2SiO3The mass ratio of the mixture is 0: 1-1: 1.
9. The method for preparing a concrete solid waste modified raw soil material according to any one of claims 1 to 8, characterized in that: the method comprises the following steps: mixing raw soil, waste residue powder, lithium residue powder and sisal fiber, adding aqueous solution of alkaline activator and water, stirring to form dry and hard mixture, placing in a mold, vibrating and tamping for molding.
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Effective date of registration: 20210916 Address after: 610091 building 10, No. 218, Jingye Road, Chengdu, Sichuan Applicant after: CHINA 19TH METALLURGICAL CORPORATION CHENGDU CONSTRUCTION Co.,Ltd. Applicant after: CHINA 19TH METALLURGICAL Corp. Address before: 617000 Bingcaogang China Nineteenth Metallurgical Group Co., Ltd. Panzhihua City, Sichuan Province Applicant before: CHINA 19TH METALLURGICAL Corp. |
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