CN112441797A - Environment-friendly admixture concrete and preparation method thereof - Google Patents
Environment-friendly admixture concrete and preparation method thereof Download PDFInfo
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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Abstract
The application relates to the field of concrete, and particularly discloses environment-friendly admixture concrete and a preparation method thereof, wherein the environment-friendly admixture concrete comprises the following raw materials in parts by weight: 80-110 parts of water, 260 parts of common portland cement, 500 parts of artificial sand, 900 parts of industrial waste stone, 20-35 parts of steel slag powder, 15-30 parts of slag powder, 2-6 parts of a water reducing agent, 45-80 parts of an adsorption purification material and 2-6 parts of a water permeable regulator. The preparation method of the environment-friendly admixture concrete comprises the following steps: step one, preparing a water permeable regulator; step two, carrying out pretreatment on industrial waste rocks: step three, preparing an adsorption purification material, and step four, mixing, stirring and homogenizing water, ordinary portland cement, artificial sand, industrial waste stone, steel slag powder, the adsorption purification material and a permeable regulator according to the formula amount to prepare the concrete. This application adopts industry waste material to carry out the preparation of concrete, and the concrete compressive strength that it made is good, can get rid of the COD of quality of water, improves the quality of water condition, improves city ecological environment.
Description
Technical Field
The application relates to the field of concrete, in particular to environment-friendly admixture concrete and a preparation method thereof.
Background
Concrete, referred to as "concrete", generally refers to cement concrete obtained by mixing cement as a cementing material, sand and stone as aggregates, and water (which may contain additives and admixtures) in a certain proportion and stirring. As an important building material, the concrete has important significance for the development of the economic society of China and has wide application in the fields of civil engineering, water conservancy and hydropower, transportation and the like.
At present, the patent with application publication number CN106830773A discloses construction waste recycled concrete, which comprises 24-36.5% of recycled coarse aggregate, 36.5-48% of recycled fine aggregate, 18% of cement and 10% of water, and the construction waste is converted into the recycled coarse aggregate and the recycled fine aggregate to prepare the recycled concrete, so that the environmental problem caused by the construction waste is solved to a certain extent, the sustainable utilization of resources is promoted, and the commercialized development of the recycled concrete is promoted.
In view of the above-mentioned related technologies, the inventor believes that concrete prepared by using construction waste as recycled aggregate has poor strength performance, forms a pavement structure with poor water permeability and air permeability, and increasingly serious urban pollution has a serious influence on urban water quality.
Disclosure of Invention
In order to improve the strength and the water permeability of concrete prepared from waste materials and improve the removal rate of COD (chemical oxygen demand) in water, the application provides the environment-friendly admixture concrete and the preparation method thereof.
The application provides an environmental protection admixture concrete adopts following technical scheme:
the environment-friendly admixture concrete comprises the following raw materials in parts by weight: 80-110 parts of water, 260 parts of common portland cement, 500 parts of artificial sand, 900 parts of industrial waste stone, 20-35 parts of steel slag powder, 15-30 parts of slag powder, 2-6 parts of a water reducing agent, 45-80 parts of an adsorption purification material and 2-6 parts of a water permeable regulator, wherein the adsorption purification material comprises 5-12 parts of a chitosan solution and 40-68 parts of charcoal powder.
By adopting the technical scheme, the industrial waste rock is used as the coarse aggregate, so that resources are saved, the resource shortage is relieved, and the economic benefit is improved. The slag powder and the slag powder can be used as aggregate for filling and can also be used as active materials of concrete, after the slag powder and the slag powder are added into the concrete, in the alkaline environment when the concrete is hydrated, the slag powder and the slag powder absorb Ca (OH) formed when the cement is hydrated2Further hydrated to form a C-S-H gel, resulting in Ca (OH) at the interfacial region2The crystal grains become small, the microstructure of the concrete is improved, the void ratio of the cement paste is reduced, the binding power of an aggregate interface is strengthened, and the mechanical property of the concrete is improved. The alkali-aggregate reaction means that active silicon oxide in the aggregate reacts with alkali in cement to generate a water absorption product, the volume of the water absorption product is increased, and the concrete is expanded and cracked, and the addition of the steel slag powder and the slag powder can inhibit the alkali-aggregate reaction, so that the coarse aggregate and the fine bone are enabled to reactFill more closely each other between the material granule, consequently can further reduce the space between the aggregate granule, the concrete of messenger is more closely knit to can make the moisture between the cement granule release, form the free water, improve the mobility of concrete.
The addition of the water permeability regulator can mainly improve the water permeability inside the concrete, form a water permeable film on the surface of the particles, and ensure the compression strength of the concrete by compounding and compatibility with other raw materials.
The chitosan solution contains chitosan with a certain concentration, the chitosan is positively charged polyelectrolyte in the solution, has strong adsorbability, can agglomerate and adsorb negatively charged suspended matters, organic matters and the like, and improves the treatment effect on the surface water. The chitosan contains certain amino and hydroxyl groups, and can play a role in chelating cations in road surface water. The chitosan has extremely high affinity to a plurality of organic matters due to the unique molecular structure, and simultaneously, the molecular structure of the chitosan contains a large amount of primary amino groups which are combined through coordination bonds to form an excellent polymer chelating agent, so that the chitosan can agglutinate the organic matters in the wastewater and improve the removal rate of COD. The biochar is deep in porous structure, has good elasticity and toughness, has large specific surface area and internal porosity, is dispersed in the internal structure of concrete, and can filter and adsorb the permeated water quality to improve the water quality condition. Meanwhile, the biochar can be used as a carrier of a chitosan solution and is synergistically dispersed in the internal structure of the concrete, so that the environmental pressure of urban ecology is delayed.
Preferably, the water penetration regulator comprises cellulose acetate and silica dimethyl silylate, and the mass ratio of the cellulose acetate to the silica dimethyl silylate is 1 (1-5).
By adopting the technical scheme, the cellulose acetate is used as a porous membrane material and has the characteristics of large water permeability and simple processing, the dimethyl silylated silica has good thickening and dispersing properties, the dispersing property of the water permeability regulator in a concrete system is improved after the dimethyl silylated silica is compounded with the cellulose acetate, and meanwhile, the dimethyl silylated silica has good film forming property and forms a water permeable membrane on the surface of aggregate particles after the dimethyl silylated silica and the cellulose acetate are compounded to regulate the water permeability of concrete.
The proportion of the cellulose acetate and the silica dimethyl silylate is optimized, the water permeability of the concrete is improved, and the compressive strength of the concrete is improved by cooperating with other raw material components.
Preferably, the apparent density of the artificial sand is not less than 2500 kilograms per m, the specific surface area of the slag powder is 350 square meters per kilogram, the specific surface area of the steel slag powder is 200 square meters per kilogram, and the density of the charcoal powder is from 1.5 to 1.6 kilograms per m.
By adopting the technical scheme, the performance parameters of the raw material components are optimized, and the compressive strength of the concrete is further improved.
Preferably, the concentration of the chitosan solution is 8-11%.
By adopting the technical scheme, the concentration of the chitosan solution is optimized, the adsorption and purification conditions of water quality are further improved, and the COD removal rate is improved.
Preferably, the mass ratio of the steel slag powder to the slag powder is 1.2: 1.
By adopting the technical scheme, the proportion of the steel slag powder and the slag powder is optimized, the compressive strength of the concrete is improved in a synergistic manner, and the performance of the concrete is improved.
In a second aspect, the application provides a preparation method of an environment-friendly admixture concrete, which adopts the following technical scheme:
the preparation method of the environment-friendly admixture concrete is characterized by comprising the following steps: the method comprises the following steps:
step one, preparing a water permeable regulator;
step two, carrying out pretreatment on industrial waste rocks: crushing industrial waste rocks until the particle size is 5-20mm, dehydrating the crushed waste rocks, wherein the water content of the dehydrated waste rocks is not more than 8%, soaking the dehydrated waste rocks in polyvinyl alcohol glue, and then drying the waste rocks, wherein a polyvinyl alcohol glue layer with the thickness of 0.5-1mm is formed on the surface of the dried waste rocks;
step three, preparing the adsorption purification material, comprising the following steps:
step 1, irradiating the charcoal powder by ultraviolet rays at the temperature of 180-190 ℃ and the relative air humidity of 20-30% for 1-2 days to prepare modified charcoal powder;
step 2, mixing and stirring the modified charcoal powder and the chitosan solution according to the formula amount, homogenizing, standing and maintaining for 50-70min to prepare an adsorption purification material;
and step four, mixing, stirring and homogenizing water, ordinary portland cement, artificial sand, industrial waste stone, steel slag powder, an adsorption purification material and a permeable regulator according to the formula amount to obtain the concrete.
Through adopting above-mentioned technical scheme, carry out the broken back of preliminary treatment to industry barren rock, carry out dehydration with barren rock, reduce the water content of barren rock, improve the quality of barren rock, soak the barren rock in the polyvinyl alcohol glue to at the barren rock surface wrapped up in and having polyvinyl alcohol glue, the barren rock surface of drying forms the moderate polyvinyl alcohol glue layer of thickness, so that when mixing the reaction with water and other aggregate, can realize the bonding between the granule fast, reach good filling effect, improve the compressive strength of concrete.
The biological carbon powder is modified, the adsorption performance of the biological carbon powder on organic matters is further improved, the COD removal rate is improved, the chitosan and the biological carbon powder are compounded and maintained under specific conditions, the adsorption and purification performance of the chitosan and the biological carbon powder on water quality is improved, and the COD removal rate is further improved.
Preferably, the preparation of the regulator comprises the following steps: cellulose acetate and silica dimethylsilylate are ground according to the formula and then extruded to produce granules with a particle size of 0.5mm or less.
By adopting the technical scheme, the cellulose acetate and the silica dimethyl silylate are ground, the surface properties of the cellulose acetate and the silica dimethyl silylate are improved during grinding, a certain activation effect is achieved, and the cellulose acetate and the silica dimethyl silylate are used after extrusion granulation, so that a water permeable film is formed on the surface of aggregate particles, and the water permeability of concrete is improved.
Preferably, in the second step, the concentration of the polyvinyl alcohol glue is 6-10%.
By adopting the technical scheme, the concentration of the polyvinyl alcohol glue is optimized, and the bonding strength among particles is improved, so that the compressive strength of the concrete is improved.
Preferably, in step 2, the curing conditions are as follows: the temperature is 160-170 ℃, and the relative humidity of air is 30-40%.
By adopting the technical scheme and adopting proper maintenance conditions, the adsorption and purification performance of the two on water quality is further improved, and the COD removal rate is improved.
In summary, the present application has the following beneficial effects:
1. because the industrial waste is used as the raw material to prepare the concrete, the method saves resources, is environment-friendly and sustainable, relieves resource shortage and improves economic benefit.
2. Cellulose acetate and silica dimethyl silylate are ground, the surface properties of the cellulose acetate and the silica dimethyl silylate are improved in the grinding process, a certain activating effect is achieved, and the cellulose acetate and the silica dimethyl silylate are used after extrusion granulation, so that a water permeable film is formed on the surface of aggregate particles, and the water permeability of concrete is improved.
3. According to the application, the biological carbon powder is subjected to modification treatment, the adsorption performance of the biological carbon powder on organic matters is further improved, the COD removal rate is improved, and after the chitosan and the biological carbon powder are compounded, the chitosan and the biological carbon powder are maintained under specific conditions, the adsorption and purification performance of the chitosan and the biological carbon powder on water quality is improved, and further the COD removal rate is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials of the following examples and comparative examples are all common commercially available raw materials.
Examples
Example 1
The environment-friendly admixture concrete comprises the following raw materials in parts by weight: 80kg of water, 220kg of ordinary portland cement, 350 kg of artificial sand, 550 kg of industrial waste stone, 20kg of steel slag powder, 15-kg of slag powder, 2 kg of a water reducing agent, 45 kg of an adsorption purification material and 2 kg of a permeable regulator, wherein the adsorption purification material comprises 5kg of a chitosan solution and 40 kg of charcoal powder;
wherein the ordinary portland cement is P.O42.5, the water reducing agent is a polycarboxylic acid water reducing agent, and the solid content is 25%; the artificial sand has an apparent density of 2600 kg/m, the specific surface area of the slag powder is 430 square meters per kg, the specific surface area of the steel slag powder is 300 square meters per kg, the density of the charcoal powder is 1.56 kg/m, the charcoal powder is planted with coconut shell activated carbon, and the concentration of the chitosan solution is 8%;
the preparation method of the environment-friendly admixture concrete comprises the following steps:
step one, preparing a water permeable regulator: grinding 1kg of cellulose acetate and 1kg of silica dimethyl silylate in a ball mill at the grinding speed of 100r/min for 15min, and then feeding the mixture into an extruder for extrusion granulation to obtain particles with the particle size of less than 0.5 mm;
step two, carrying out pretreatment on industrial waste rocks: sending industrial waste stone into a crusher to be crushed to the particle size of 5-20mm and carrying out continuous grading, dehydrating the crushed waste stone, wherein the water content of the dehydrated waste stone is not more than 8%, soaking the dehydrated waste stone in polyvinyl alcohol glue for 15min, and then carrying out constant-temperature drying treatment at 70 ℃, wherein a polyvinyl alcohol glue layer with the thickness of 0.8mm is formed on the surface of the dried waste stone; wherein the concentration of the polyvinyl alcohol glue is 8%;
step three, preparing the adsorption purification material, comprising the following steps:
step 1, irradiating the charcoal powder with ultraviolet rays by using a 300W ultraviolet lamp for 2 days under the conditions that the temperature is 190 ℃ and the relative humidity of air is 20 percent to prepare modified charcoal powder;
step 2, mixing and stirring the modified charcoal powder and the chitosan solution according to the formula amount, homogenizing, standing and maintaining for 65min under the conditions that the temperature is 165 ℃ and the air humidity is 30%, and preparing an adsorption purification material;
and step four, mixing, stirring and homogenizing water, ordinary portland cement, artificial sand, industrial waste stone, steel slag powder, an adsorption purification material and a permeable regulator in the step two according to the formula amount to obtain the concrete.
Examples 2 to 4 differ from example 1 only in part of the feed components, and the remainder was the same as example 1, with part of the feed components of examples 1 to 4 being shown in Table 1.
Table 1 examples 1-4 parts of the feed composition
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Water (W) | 80 | 110 | 90 | 90 |
| Cement | 150 | 185 | 177 | 177 |
| Artificial sand | 350 | 500 | 415 | 415 |
| Waste stone | 550 | 700 | 600 | 600 |
| Water reducing agent | 2 | 6 | 4.5 | 4.5 |
| Steel slag powder | 20 | 35 | 25 | 30 |
| Slag powder | 15 | 30 | 25 | 25 |
Example 5
The difference from example 4 was that 1kg of cellulose acetate and 5kg of silica dimethylsilylate were used, and the rest was the same as example 4.
Example 6
The difference from example 4 was that 1kg of cellulose acetate and 3.5kg of silica dimethylsilylate were used, and the rest was the same as example 4.
Example 7
The difference from example 4 was that 1kg of cellulose acetate and 3kg of silica dimethylsilylate were used, and the balance was the same as example 4 and 3.
Example 8
The difference from example 7 is that the chitosan concentration is 11%, and the rest is the same as example 7.
Example 9
The difference from example 7 is that the concentration of chitosan is 10%, and the rest is the same as example 7.
Comparative example
Comparative example 1
The difference from example 1 is that in step one, no cellulose acetate was added, and the rest is the same as example 1.
Comparative example 2
The difference from the embodiment 1 is that in the step one, the preparation steps of the water penetration regulator are as follows: cellulose acetate and silica dimethylsilylate were mixed directly and homogenized, and the rest was the same as in example 1.
Comparative example 3
The difference from example 1 is that the same procedure as in example 1 was repeated except that no chitosan solution was added.
Comparative example 4
The difference from the example 1 is that in the third step, the step 1 is omitted, and the specific steps of the preparation of the adsorption purification material are as follows: mixing the biochar and the chitosan solution according to the formula amount, stirring and homogenizing, standing and maintaining for 65min under the conditions that the temperature is 165 ℃ and the air humidity is 30%, and preparing an adsorption purification material; the rest is the same as in example 1.
Comparative example 5
The difference from the example 1 is that in the third step, the preparation method of the adsorption purification material comprises the following steps: step 1, irradiating the charcoal powder by ultraviolet rays under the conditions that the temperature is 190 ℃ and the relative humidity of air is 20 percent for 2 days to prepare modified charcoal powder;
step 2, mixing, stirring and homogenizing the modified charcoal powder and the chitosan solution according to the formula amount to prepare an adsorption purification material;
the rest is the same as in example 1.
Comparative example 6
The difference from the embodiment 1 is that in the step two, the industrial waste rock is sent into a crusher to be crushed to 5-20mm and continuous gradation is carried out; the rest is the same as in example 1.
Performance test
The concrete test blocks prepared in examples 1-9 and comparative examples 1-6 were tested for 28-day compressive strength and concrete permeability coefficient according to JTG E30-2005 "test Specification for road engineering Cement and Cement concrete" and GB/T25993-.
COD removal rate test: the concrete samples prepared in examples 1 to 9 and comparative examples 1 to 6 were infiltrated with a water sample having COD =60ppm, and the COD in the water permeated through the concrete was analyzed by a COD meter under the same water quality and amount, and the COD removal rate was calculated, and the results are shown in table 2.
TABLE 2 test results
| Compressive strength/MPa | Coefficient of Permeability/(mm/s) | COD removal Rate/%) | |
| Example 1 | 35.2 | 10 | 50.2 |
| Example 2 | 35.5 | 10 | 50.2 |
| Example 3 | 36.3 | 10.1 | 50.3 |
| Example 4 | 37 | 10.1 | 50.3 |
| Example 5 | 37.1 | 10.7 | 50.5 |
| Example 6 | 37.3 | 10.5 | 50.8 |
| Example 7 | 37.5 | 11 | 51.3 |
| Example 8 | 37.5 | 11.1 | 51.4 |
| Example 9 | 37.8 | 11.5 | 51.9 |
| Comparative example 1 | 34.5 | 5 | 35.4 |
| Comparative example 2 | 34.6 | 7 | 40 |
| Comparative example 3 | 34 | 9 | 20.9 |
| Comparative example 4 | 34.1 | 9 | 30.7 |
| Comparative example 5 | 34.2 | 9 | 37 |
| Comparative example 6 | 27.3 | 9 | 45.9 |
It can be seen from the combination of examples 1-4 and table 2 that the compressive strength of the concrete is improved to a certain extent by adjusting the component ratios of some raw materials, and the compressive strength of the prepared concrete is the best when the mass ratio of the steel slag powder to the slag powder is 1.2: 1. As can be seen by combining examples 4 to 7 with Table 2, the adjustment of the mass ratio of cellulose acetate to silica dimethylsilylate has a large influence on the water permeability of the concrete, and the water permeability of the concrete is optimized when the mass ratio of cellulose acetate to silica dimethylsilylate is 1: 3. Meanwhile, the permeable regulator and other raw material components cooperate to improve the adsorption treatment effect of the concrete on water quality, improve the removal rate of COD and improve the urban ecological environment. As can be seen by combining examples 7-9 and Table 2, adjusting the concentration of chitosan, together with biochar, improves the COD removal rate of concrete and improves the urban ecological environment.
By combining example 1 and comparative example 1 and table 2, it can be seen that the water permeability effect of the concrete is remarkably reduced, the water permeability coefficient is low, and the water permeability effect is poor without adding the cellulose acetate. Meanwhile, the concrete prepared by the comparative example 2 has a reduced water permeability coefficient because the cellulose acetate and the silica dimethylsilylate are not subjected to extrusion granulation, and are directly mixed and homogenized and then added into the subsequent raw material components, so that the synergistic effect of the silica dimethylsilylate and the cellulose acetate is seen, and the preparation method of the permeable regulator can improve the water permeability of the permeable regulator.
By combining example 1 and comparative example 3 and table 2, it can be seen that the COD removal rate of the concrete without adding the chitosan solution is significantly reduced, and it can be seen that the chitosan solution can excite the adsorption purification performance of the biochar, thereby improving the COD removal rate of the concrete.
When example 1 and comparative example 4 were combined and table 2 was used, it was found that the COD removal rate of the whole concrete was also decreased without modifying the biochar.
Combining example 1 and comparative example 5 with table 2, it can be seen that the COD removal rate of the concrete was also reduced without the corresponding curing when the modified charcoal powder and the chitosan solution were directly mixed, because of this.
It can be seen by combining example 1 and comparative example 6 and table 2 that the industrial waste rock is directly used after being crushed, and a polyvinyl alcohol glue layer is not formed on the surface of the waste rock, the compressive strength of the concrete prepared in comparative example 6 is remarkably reduced, and the compressive strength of the concrete prepared in example 1 is high, because the polyvinyl alcohol glue layer with a moderate thickness is formed on the surface of the waste rock, so that when the polyvinyl alcohol glue layer is mixed with water and other aggregates for reaction, the bonding among particles can be quickly realized, a good filling effect is achieved, and the compressive strength of the concrete is improved.
As can be seen from examples 1-9 in combination with Table 2, the concrete prepared by the method has good compressive strength, certain water permeability, good COD removal rate and purification effect on water quality.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The environment-friendly admixture concrete is characterized by comprising the following raw materials in parts by weight: 80-110 parts of water, 260 parts of common portland cement, 500 parts of artificial sand 350, 700 parts of industrial waste stone 550, 20-35 parts of steel slag powder, 15-30 parts of slag powder, 2-6 parts of a water reducing agent, 45-80 parts of an adsorption purification material and 2-6 parts of a water permeable regulator, wherein the adsorption purification material comprises 5-12 parts of a chitosan solution and 40-68 parts of charcoal powder.
2. The environment-friendly admixture concrete as defined in claim 1, wherein: the water penetration regulator comprises cellulose acetate and silica dimethyl silylate, and the mass ratio of the cellulose acetate to the silica dimethyl silylate is 1 (1-5).
3. The environment-friendly admixture concrete as defined in claim 1, wherein: the apparent density of the artificial sand is more than or equal to 2500 kg/m, the specific surface area of the slag powder is 350 square meters per kg, the specific surface area of the slag powder is 200 square meters per kg, the specific surface area of the steel slag powder is 300 square meters per kg, and the density of the charcoal powder is from 1.5 to 1.6 kg/m.
4. The environment-friendly admixture concrete as defined in claim 1, wherein: the concentration of the chitosan solution is 8-11%.
5. The environment-friendly admixture concrete as defined in claim 1, wherein: the mass ratio of the steel slag powder to the slag powder is 1.2: 1.
6. The method for producing an environmental-friendly admixture concrete according to any one of claims 1 to 5, wherein: the method comprises the following steps:
step one, preparing a water permeable regulator;
step two, carrying out pretreatment on industrial waste rocks: crushing industrial waste rocks until the particle size is 5-20mm, dehydrating the crushed waste rocks, wherein the water content of the dehydrated waste rocks is not more than 8%, soaking the dehydrated waste rocks in polyvinyl alcohol glue, and then drying the waste rocks, wherein a polyvinyl alcohol glue layer with the thickness of 0.5-1mm is formed on the surface of the dried waste rocks;
step three, preparing the adsorption purification material, comprising the following steps:
step 1, irradiating the charcoal powder by ultraviolet rays at the temperature of 180-190 ℃ and the relative air humidity of 20-30% for 1-2 days to prepare modified charcoal powder;
step 2, mixing and stirring the modified charcoal powder and the chitosan solution according to the formula amount, homogenizing, standing and maintaining for 50-70min to prepare an adsorption purification material;
and step four, mixing, stirring and homogenizing water, ordinary portland cement, artificial sand, industrial waste stone, steel slag powder, an adsorption purification material and a permeable regulator according to the formula amount to obtain the concrete.
7. The method for preparing the environment-friendly admixture concrete according to claim 6, wherein: the preparation of the regulator comprises the following steps: cellulose acetate and silica dimethylsilylate are ground according to the formula and then extruded to produce granules with a particle size of 0.5mm or less.
8. The method for preparing the environment-friendly admixture concrete according to claim 6, wherein: in the second step, the concentration of the polyvinyl alcohol glue is 6-10%.
9. The method for preparing the environment-friendly admixture concrete according to claim 6, wherein: in step 2, the curing conditions are as follows: the temperature is 160-170 ℃, and the relative humidity of air is 30-40%.
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| US11679424B1 (en) | 2021-12-27 | 2023-06-20 | B B & M Materials, LLC | Disposal of biomass waste |
| CN114907048A (en) * | 2022-04-15 | 2022-08-16 | 成都建工赛利混凝土有限公司 | Anti-cracking environment-friendly admixture for concrete and preparation method thereof |
| CN115838267A (en) * | 2022-12-05 | 2023-03-24 | 北京建筑大学 | Preparation method and application of pervious concrete with pollution-reducing and carbon-reducing functions |
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