CN115650664B - Multifunctional environment-friendly ecological concrete and preparation method thereof - Google Patents
Multifunctional environment-friendly ecological concrete and preparation method thereof Download PDFInfo
- Publication number
- CN115650664B CN115650664B CN202211280438.0A CN202211280438A CN115650664B CN 115650664 B CN115650664 B CN 115650664B CN 202211280438 A CN202211280438 A CN 202211280438A CN 115650664 B CN115650664 B CN 115650664B
- Authority
- CN
- China
- Prior art keywords
- phosphogypsum
- parts
- coarse aggregate
- solution
- sepiolite powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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 novel green building materials, and discloses multifunctional environment-friendly ecological concrete and a preparation method thereof. The concrete comprises the following raw materials in parts by weight: 50-180 parts of cement, 30-110 parts of saw mud, 30-110 parts of modified sepiolite powder, 900-1500 parts of phosphogypsum coarse aggregate, 5-10 parts of water reducer, 70-170 parts of water, 3-8 parts of potassium polyacrylate, 4-9 parts of polyvinyl acetate emulsion and 3-6 parts of 2-methyl-2, 4-pentanediol solution. The invention reasonably utilizes solid wastes such as saw mud, phosphogypsum and the like, and the prepared concrete not only has excellent strength, toughness, shrinkage resistance and the like, but also has the functions of adsorption, purification, water permeability, temperature and humidity regulation and the like, and can be suitable for a plurality of application scenes.
Description
Technical Field
The invention belongs to the technical field of novel green building materials, and particularly relates to multifunctional environment-friendly ecological concrete and a preparation method thereof.
Background
Concrete is a widely applied material in the building field, and along with the development of the age, the economic capability and the technological strength are improved, so that the research and development emphasis is gradually changed from high strength and high performance to energy conservation and environmental protection, and ecological concrete is widely paid attention in recent years. The ecological concrete is a special concrete, and the materials are selected and manufactured by a certain difference from the common concrete, so that the manufactured concrete has special structure and surface characteristics, can reduce environmental load, can coordinate with ecological environment, and has positive protection effect on natural environment and ecological balance.
The ecological concrete is mainly classified into two types, i.e., environment-friendly ecological concrete and biocompatible ecological concrete. The environment-friendly ecological concrete is concrete capable of reducing environmental load, production is realized by recycling solid waste, the service life of the concrete is prolonged by enhancing the durability of the concrete, the influence of the concrete on the environment is improved by changing the performance of the concrete, and finally the environmental load is reduced. The biocompatible ecological concrete can be harmonious and coexist with animals and plants in the nature, and can coordinate ecological environment to a certain extent, effectively beautify the environment and achieve harmonious and coexistence of people and nature.
In the aspect of environment-friendly ecological concrete, various solid waste materials are applied to the preparation of concrete, so that the problem of disposal of solid waste is solved, and a certain environment-friendly effect is achieved. There are a number of challenges to overcome: 1) After the solid waste is added into the ecological concrete, adverse effects such as strength reduction, easy cracking and the like are easy to generate, so that the utilization types of the solid waste are few, the utilization amount is low, the selection and proportioning arrangement of materials are limited in order to ensure the mechanical properties of the concrete, more fly ash, slag and the like are still applied at present, and the utilization and development of other waste materials are slow; 2) The ecological concrete has single function, and besides the solid waste is consumed in the preparation process, many ecological concretes can not realize more environmental functions in the use process.
Therefore, the development of the multifunctional ecological concrete with more solid waste utilization types, higher utilization amount and better performance has very important significance for promoting the development of the ecological concrete, protecting the ecological environment and promoting the harmonious development of people and nature.
Disclosure of Invention
Aiming at the defects of the existing environment-friendly ecological concrete, the invention provides the multifunctional environment-friendly ecological concrete and the preparation method thereof, and solid wastes such as saw mud, phosphogypsum and the like are reasonably utilized, so that the prepared concrete has excellent strength, toughness, shrinkage resistance and other performances, and simultaneously has the functions of adsorbing, purifying, permeating water, regulating temperature and humidity and the like.
In order to solve the technical problems, the invention provides multifunctional environment-friendly ecological concrete, which comprises the following raw materials in parts by weight: 50-180 parts of cement, 30-110 parts of saw mud, 30-110 parts of modified sepiolite powder, 900-1500 parts of phosphogypsum coarse aggregate, 5-10 parts of water reducer, 70-170 parts of water, 3-8 parts of potassium polyacrylate, 4-9 parts of polyvinyl acetate emulsion and 3-6 parts of 2-methyl-2, 4-pentanediol solution.
In the scheme, the modified sepiolite powder is prepared by electrically and organically modifying the sepiolite powder.
In the scheme, the particle size of the modified sepiolite powder is 0.05-0.1 mu m, and the specific surface area is 800-1100m 2 /g。
In the scheme, after phosphogypsum is converted into semi-hydrated phosphogypsum, the semi-hydrated phosphogypsum, modified sepiolite powder and phthalate are mixed and granulated, and then the phosphogypsum coarse aggregate is prepared through cement cladding.
In the scheme, the particle size of the phosphogypsum coarse aggregate is 5-15mm, and the density is 600-900kg/m 3 The barrel pressure strength is 8-12MPa.
In the above scheme, the 2-methyl-2, 4-pentanediol solution is prepared by mixing 2-methyl-2, 4-pentanediol and hydrocarbon solvent, and the mass ratio of the 2-methyl-2, 4-pentanediol to the hydrocarbon solvent is 1: (1-1.5).
In the scheme, the saw mud is granite tailing with the grain diameter smaller than 0.045mm and SiO 2 And Al 2 O 3 The sum of the content is more than 85 percent.
In the scheme, the solid content of the polyvinyl acetate emulsion is 30-50%.
In the scheme, the cement is ordinary silicate cement, and the strength grade is 42.5 or 52.5.
In the scheme, the preparation method of the modified sepiolite powder comprises the following steps:
1) Wet ball milling is carried out on sepiolite powder, saturated NaOH solution and tourmaline are added into the sepiolite powder after ball milling, the solution is electrified, the electrification is stopped after the pH value of the solution reaches neutrality, and the tourmaline is removed, so that modified sepiolite slurry is obtained;
2) Adding an acrolein solution into the modified sepiolite slurry, stirring uniformly, sealing, standing for reaction, drying the slurry after the reaction is finished, washing the obtained solid with water, drying again, repeatedly washing and drying, and grinding the solid into powder to obtain the modified sepiolite powder.
Further, the sepiolite powder is fibrous, has a Mohs hardness of 1.8-2.2 and a density of 1.4-1.8g/cm 3 A specific surface area of 400-750m 2 /g。
Further, the wet ball milling uses an aluminum chloride solution as a grinding aid, the concentration of the aluminum chloride solution is 15-30%, and the mass ratio of the volume of the aluminum chloride solution to the sepiolite powder is (4-16) mL:5g.
Further, the diameter of the grinding beads of the wet ball milling is 0.5-1.5mm, and the density of the grinding beads is 6-8kg/m 3 The mass ratio of the grinding beads to the grinding materials is (8-12): 1, grinding time is 1-3h.
Further, the mass ratio of the volume of the saturated NaOH solution to the sepiolite powder is (0.5-2) mL:1g.
Further, the tourmaline is one of magnesium tourmaline, ferroelectric tourmaline and lithium tourmaline, the particle size of the tourmaline is more than or equal to 9.6mm, and the mass of the tourmaline is 1/3-1/2 of the mass of the sepiolite powder.
Further, the electrifying voltage is 30-60V, and the electrifying time is 12-18h.
Further, the concentration of the acrolein solution is 1.5-2.5mg/L, and the mass ratio of the volume of the acrolein solution to the sepiolite powder is (1-5) mL:50g.
Further, the reaction time of sealing and standing is 12-24min.
Further, the drying temperature is 180-220 ℃ and the drying time is 1-3h.
In the scheme, the preparation method of the phosphogypsum coarse aggregate comprises the following steps:
1) Adding phosphogypsum into a salt solution, heating under a pressurizing condition to react, and drying after the reaction to obtain alpha-hemihydrate phosphogypsum;
2) Grinding alpha-semi-hydrated phosphogypsum into powder, adding modified sepiolite powder and phthalate, uniformly mixing, carrying out hydration granulation, carrying out cladding treatment by cement after particle forming, and obtaining phosphogypsum coarse aggregate.
Further, the particle size of the phosphogypsum is 5-50 μm.
Further, the salt solution is NaCl solution with the mass fraction of 10-15%, and the mass ratio of the volume of the salt solution to phosphogypsum is (14-19) mL:10g.
Further, the reaction pressure is 30-45MPa, the reaction temperature is 135-155 ℃ and the reaction time is 30-45min.
Further, the drying temperature is 120-180 ℃ and the drying time is 1-3h.
Further, the addition amount of the modified sepiolite powder is 6-10% of the mass of the alpha-semi-hydrated phosphogypsum.
Further, the addition amount of the phthalate is 2 to 3.5 percent of the mass of the modified sepiolite powder.
Further, the mass ratio of the granulated particles to the cement is (4-5): 1.
the invention also provides a preparation method of the multifunctional environment-friendly ecological concrete, which comprises the following steps:
1) Steam curing is carried out on phosphogypsum coarse aggregate, then the phosphogypsum coarse aggregate is placed in sodium carbonate solution for soaking, and the phosphogypsum coarse aggregate is taken out to obtain pretreated coarse aggregate;
2) Carrying out wet ball milling on saw mud, adding the saw mud subjected to ball milling and water into 2-methyl-2, 4-pentanediol solution, and uniformly mixing to obtain saw mud dispersion slurry;
3) Taking cement, modified sepiolite powder and pretreated coarse aggregate, and uniformly mixing to obtain a dry mixed material;
4) Adding a water reducer, water, potassium polyacrylate and polyvinyl acetate emulsion into the dry blend, uniformly mixing, adding saw mud dispersion slurry, and uniformly mixing again to obtain a blend;
5) And (3) filling the mixture into a mold, and demolding and curing after hardening to obtain the multifunctional environment-friendly ecological concrete.
In the scheme, the steam curing is water steam curing, and the water solution for generating steam contains 1-4% of ethyl acetate by mass percent.
In the scheme, the steam curing temperature is 60-80 ℃, the humidity is 75-95%, and the curing time is 48-96h.
In the scheme, the concentration of the sodium carbonate solution is 5-10%, and the soaking time is 1-2h.
In the scheme, the wet ball milling uses an aluminum chloride solution as a grinding aid, the concentration of the aluminum chloride solution is 15-30%, and the mass ratio of the volume of the aluminum chloride solution to the mass of the saw mud is (4-16) mL:5g.
In the scheme, the diameter of the grinding beads of the wet ball milling is 0.5-1.5mm, and the density of the grinding beads is 6-8kg/m 3 The mass ratio of the grinding beads to the grinding materials is (8-12): 1, grinding time is 1-3h.
In the scheme, the water consumption in the step 2) accounts for 50-70% of the total water consumption, and the water consumption in the step 4) accounts for 30-50% of the total water consumption.
In the scheme, the curing temperature in the step 5) is 25+/-2 ℃, the curing humidity is more than 90%, and the curing time is more than 21d.
The technical conception of the invention is as follows:
1) The invention uses the solid waste saw mud for preparing concrete, and the main component of the saw mud is SiO 2 And Al 2 O 3 Can be used as a cementing material, but saw mud particles are thinner, are easy to agglomerate after absorbing water, and can directly influence SiO due to uneven dispersion in concrete slurry 2 And Al 2 O 3 On the one hand, the invention further reduces the particle size of the saw mud to about 1 mu m after ball milling by wet ball milling to strengthen SiO 2 And Al 2 O 3 Is a compound having an activity of (a); on the other hand, the 2-methyl-2, 4-pentanediol solution is used as a dispersing agent, so that the interfacial tension between saw mud particles and water is reduced, and the saw mud is uniformly dispersed in the slurry.
2) The invention uses solid waste phosphogypsum to prepare concrete, p-phosphogypsumGranulating Gypsum to obtain coarse aggregate for reducing exploitation of broken stone and pebble, and removing CaSO from phosphogypsum 4 In addition, the invention also contains phosphorus, fluorine, organic matters and other impurities, so that a small amount of modified sepiolite powder and phthalate are added in the granulating process, and the sepiolite powder can effectively adsorb residual fluoride, indissolvable phosphorus and other harmful substances, thereby eliminating the influence of the harmful impurities on the performance of a concrete matrix; the phthalate has certain plasticizing and toughening effects, so that the coarse aggregate has higher strength.
3) The sepiolite is also used for preparing concrete, the sepiolite can replace part of cement, the cement consumption is reduced, the carbon emission in the production process of the concrete is reduced, the sepiolite also has good adsorption property and moisture absorption and release property, and can endow the concrete with more functions, but the sepiolite is required to be modified in realization of the properties, and the traditional acid modification and thermal activation modification have limited effects, so that the sepiolite adopts a modification method combining electric polarity modification and organic modification, and Si-O-Mg-O-Si bonds in the crystal structure of the sepiolite are fully broken by utilizing the electric polarity modification, so that the penetrability of fiber pore channels in the crystal network structure is effectively increased, the specific surface area and the internal porosity of the crystal are increased, and the adsorption and moisture absorption and release properties are enhanced; the organic modification further reacts with polar bonds in the crystal, so that the dispersibility of sepiolite powder in the slurry can be improved, and the cohesiveness can be reduced.
4) In the preparation process of the concrete, firstly, steam curing and salt solution soaking pretreatment are carried out on phosphogypsum coarse aggregate, the steam curing is beneficial to improving the early hydration rate of phosphogypsum, sepiolite and cement in the coarse aggregate and promoting the formation of strength, and ethyl acetate is added into steam, so that the phosphogypsum coarse aggregate is beneficial to the infiltration of water vapor into particle shells and the water required in the hydration process of the inside of particles is supplemented; the salt solution is favorable for the secondary formation of the strength of the particle body, further promotes hydration, and simultaneously has certain filling and healing effects on micro cracks and micro holes inside and outside coarse aggregate particles in the forming process, so that the prepared coarse aggregate is more compact. In the subsequent mixing process, a mixing procedure of adding raw materials in batches is adopted, so that the homogeneity of the saw mud, the modified sepiolite powder and the phosphogypsum coarse aggregate in the mixing process is further improved, and the optimization of the concrete performance is realized.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention takes saw mud, phosphogypsum and sepiolite as main raw materials, and is used for preparing multifunctional environment-friendly ecological concrete after the three raw materials are properly treated, wherein the saw mud is taken as a cementing material, the phosphogypsum is taken as coarse aggregate after granulation, the sepiolite is used for providing adsorption and moisture absorption and release performances, the phosphogypsum coarse aggregate promotes the dispersion of the sepiolite and the saw mud, the sepiolite adsorbs pollutants such as phosphorus, fluorine, organic matters and the like in the phosphogypsum coarse aggregate, the saw mud increases the quantity of hydration products in a matrix, enhances the cohesive force of the slurry and fiber bundles in the sepiolite, and the saw mud and the sepiolite complement each other, thereby enhancing the performances such as strength, toughness, shrinkage resistance and the like of the concrete, and simultaneously enabling the concrete to have the functions of adsorption, purification, water permeability, temperature and humidity regulation and the like.
2) The invention reasonably utilizes solid wastes such as saw mud, phosphogypsum and the like, reduces the practicability of coarse aggregates such as cement, broken stone and pebble, realizes the secondary treatment and utilization of pollutants, simultaneously reduces the cost of production materials, and realizes win-win of ecological environment and economic benefit. The concrete has more functions and wider application range, is particularly suitable for closed environments such as warehouses, collection rooms and the like with requirements on temperature and humidity, and open environments such as green belt structures, pavement surfaces, river channel water purifying channels, water area structures and the like, can be applied in indoor environments, can effectively reduce noise, purify air and regulate temperature and humidity, can be applied in outdoor environments, can effectively reduce environmental load, and can coexist in harmony with animals and plants.
Detailed Description
For a better understanding of the present invention, the following examples are further illustrated, but are not limited to the following examples.
In the following examples, the cement used was PO42.5 grade Portland cement; the adopted saw mud is granite tailing with the average grain diameter of 0.03mm, and the SiO thereof is 2 And Al 2 O 3 The sum of the content is 86.3%; the sepiolite powder is fibrous, has the Mohs hardness of 2.2 and the density of 1.8g/cm 3 A specific surface area of 750m 2 /g; the phosphogypsum is gray powder, the average grain diameter is 20 mu m, the content of calcium sulfate dihydrate is 80%, and the water solubility P is high 2 O 5 1.2% and 0.4% water-soluble fluorine; the adopted water reducer is a polycarboxylic acid high-performance water reducer, the water reducing rate is 30%, and the solid content is 38%; the adopted potassium polyacrylate is white powder, the purity is 80 percent, and the potassium content is 13 percent; the adopted polyvinyl acetate emulsion is colorless viscous liquid, and the solid content is 33%; the hydrocarbon solvent is saturated cycloparaffin, specifically KM-310 hydrocarbon cleaning agent of Soy chemical industry Co., ltd. In Suzhou, and the total content of aromatic hydrocarbon is 0.009%; the tourmaline is magnesium tourmaline with particle diameter of 9.6mm and density of 3.1g/cm 3 。
Examples 1 to 4
The multifunctional environment-friendly ecological concrete in the examples 1-4 consists of cement, saw mud, modified sepiolite powder, phosphogypsum coarse aggregate, a water reducer, water, potassium polyacrylate, polyvinyl acetate emulsion and 2-methyl-2, 4-pentanediol solution, wherein the mass parts of the raw materials are shown in the table 1.
Table 1 examples 1-4 raw material composition (parts by mass) of multifunctional environmental-friendly ecological concrete
The preparation method of the 2-methyl-2, 4-pentanediol solution in examples 1-4 comprises the following steps: uniformly mixing 2-methyl-2, 4-pentanediol and hydrocarbon solvent according to mass ratio to obtain 2-methyl-2, 4-pentanediol solution. The mass ratio of 2-methyl-2, 4-pentanediol to hydrocarbon solvent in examples 1-4 was 1:1, 1:1.2, 1:1.4, 1:1.5, respectively.
The preparation method of the modified sepiolite powder in examples 1-4 comprises the following steps:
1) Wet ball milling is carried out on sepiolite powder, saturated NaOH solution and tourmaline are added into the sepiolite powder after ball milling, the solution is electrified, the electrification is stopped after the pH value of the solution reaches neutrality, and the tourmaline is removed, so that modified sepiolite slurry is obtained;
2) Adding an acrolein solution into the modified sepiolite slurry, stirring uniformly, sealing, standing for reaction, drying the slurry after the reaction is finished, washing the obtained solid with water, drying again, repeatedly washing and drying for 2-3, and grinding the solid into powder to obtain the modified sepiolite powder.
Table 2 examples 1-4 preparation of modified sepiolite powder step 1) main parameters
| Group of | Volume of saturated NaOH solution | Tourmaline mass | Energizing voltage | Power-on time |
| Example 1 | 50mL | 1/3 of the sepiolite powder mass | 30V | 18h |
| Example 2 | 100mL | 1/3 of the sepiolite powder mass | 40V | 16h |
| Example 3 | 150mL | 2/5 of the sepiolite powder mass | 50V | 14h |
| Example 4 | 200mL | 1/2 of the sepiolite powder mass | 60V | 12h |
Note that: the volume of saturated NaOH solution is exemplified by 100g sepiolite powder.
TABLE 3 examples 1-4 preparation of modified sepiolite powder step 2) main parameters
Note that: the volume of the acrolein solution is exemplified by 100g of sepiolite powder.
The preparation method of phosphogypsum coarse aggregate in examples 1-4 comprises the following steps:
1) Adding phosphogypsum into NaCl solution, heating under the condition of pressurization to react, and drying after the reaction to obtain alpha-semi-hydrated phosphogypsum;
2) Grinding alpha-semi-hydrated phosphogypsum into powder, adding modified sepiolite powder and phthalate, uniformly mixing, carrying out hydration granulation, carrying out cladding treatment by cement after particle forming, and obtaining phosphogypsum coarse aggregate.
TABLE 4 examples 1-4 phosphogypsum coarse aggregate preparation step 1) main parameters
Note that: the volume of NaCl solution is exemplified by 100g phosphogypsum.
TABLE 5 examples 1-4 phosphogypsum coarse aggregate preparation step 2) main parameters
Note that: the addition amount of the modified sepiolite powder is based on the mass of the alpha-hemihydrate phosphogypsum; the addition amount of phthalate is based on the mass of the modified sepiolite powder.
The preparation method of the multifunctional environment-friendly ecological concrete in the embodiments 1-4 comprises the following steps:
1) Steam curing is carried out on phosphogypsum coarse aggregate, then the phosphogypsum coarse aggregate is placed in sodium carbonate solution for soaking, the liquid level of the sodium carbonate solution is 3-5cm higher than that of the phosphogypsum coarse aggregate after the sodium carbonate solution is immersed in the phosphogypsum coarse aggregate during soaking, and the phosphogypsum coarse aggregate is taken out to obtain pretreated coarse aggregate;
2) Carrying out wet ball milling on saw mud, adding the saw mud subjected to ball milling and water into 2-methyl-2, 4-pentanediol solution, and uniformly mixing to obtain saw mud dispersion slurry;
3) Taking cement, modified sepiolite powder and pretreated coarse aggregate, and uniformly mixing to obtain a dry mixed material;
4) Adding a water reducer, water, potassium polyacrylate and polyvinyl acetate emulsion into the dry blend, uniformly mixing, adding saw mud dispersion slurry, and uniformly mixing again to obtain a blend;
5) And (3) filling the mixture into a mold, and demolding and curing after hardening to obtain the multifunctional environment-friendly ecological concrete.
TABLE 6 examples 1-4 main parameters for phosphogypsum coarse aggregate pretreatment
TABLE 7 examples 1-4 concrete preparation Main parameters
Note that: the water consumption of the step 2) and the step 4) is based on the total water content in the raw materials.
The wet ball milling process for the kyanite powder or sawing mud in examples 1-4 was: mixing sepiolite powder or saw mud with aluminum chloride solution, adding powder with diameter of 1mm and density of 6kg/m 3 Is milled by the milling beads of (a).
Table 8 examples 1-4 wet ball milling main parameters
Note that: the addition amount of the aluminum chloride solution is exemplified by 100g of sepiolite powder or saw dust.
Comparative example 1
The traditional ecological concrete comprises the following raw materials in parts by weight: 140 parts of PO42.5 grade ordinary Portland cement, 35 parts of fly ash, 35 parts of slag, 1050 parts of crushed stone, 6 parts of water reducer and 80 parts of water.
The working properties and mechanical properties of the concretes of examples 1 to 4 and comparative example 1 were tested, wherein the apparent density and slump were as described in GB/T50080-2016 method for testing Performance of ordinary concrete mixtures; compressive strength is referred to GB/T50081-2019, standard of test method for physical and mechanical Properties of concrete; the dry shrinkage value refers to GB/T29417-2012 method for testing the drying shrinkage cracking performance of cement mortar and concrete; the water permeability coefficient adopts a constant water head method, namely, the constant water pressure is kept, and the water permeability coefficient is calculated through the water quantity which penetrates through a test piece within a certain time; the results are shown in Table 9.
TABLE 9 working Properties and mechanical Properties of the concrete of examples 1-4 and comparative example 1
As can be seen from table 9, the multifunctional environment-friendly ecological concretes of examples 1 to 4 have an increased slump and a decreased dry shrinkage value, and at the same time, have significantly improved mechanical properties with a small decrease in water permeability coefficient while still satisfying the basic water permeability requirement of the water permeable pavement under the condition of controlling the decrease in volume weight of the concrete, as compared with the conventional ecological concretes of comparative example 1.
The concrete of examples 1 to 4 and comparative example 1 was subjected to the tests of contaminant adsorption, noise reduction and temperature and humidity adjustment, in which 100 mm. Times.100 mm concrete samples were immersed in 5L Pb-containing sample 2+ 、Cd 2+ 、Cu 2+ In the mixed solution of the equal heavy metal ions, the initial heavy metal concentration is 50mg/L, and the adsorption capacity of the concrete to the heavy metal is measured after 48 hours; the formaldehyde adsorption test is to place concrete slab with the thickness of 500mm multiplied by 50mm in a sealing box, and to introduce raw material gas, and to adjust the formaldehyde content in the raw material gas to 1000mg/m 3 The gas flow rate is 25m 3 And/h, the temperature and humidity are 30 ℃ and 70%, and the formaldehyde content in the sealed box is measured after 1 h; the noise reduction test is to take concrete test pieces with the dimensions of 100mm multiplied by 400mm, and test the propagation velocity of sound waves in the concrete; and (3) a 150mm multiplied by 150mm concrete test piece is taken by a temperature and humidity adjustment test, dried and cooled in an oven, and then placed into a 500mm multiplied by 500mm sealed cell built by a PVC plate, and the change rate of temperature and humidity in the sealed cell is recorded after 12 hours.
TABLE 10 adsorption, noise reduction and temperature and humidity Condition of the concrete of examples 1-4 and comparative example 1
The adsorption test results show that the traditional ecological concrete has very low adsorption rate to pollutants, and the adsorption efficiency of the multifunctional environment-friendly ecological concrete to heavy metals and formaldehyde is remarkably improved; the result of the noise reduction test shows that the traditional ecological concrete has higher porosity, uneven internal medium and more obstruction to sound waves when propagating in the interior, so the noise reduction effect is better, the propagation speed of the sound waves in the common concrete is 4-5km/s, and the multifunctional environment-friendly ecological concrete still has a certain noise reduction effect; the temperature and humidity test regulation result shows that the multifunctional environment-friendly ecological concrete has a larger regulation range for temperature and humidity and better improvement effect on adverse environment; in conclusion, the multifunctional environment-friendly ecological concrete provided by the invention has the functions of noise reduction, water permeability and the like, and simultaneously endows the concrete with more other functional attributes, so that the multifunctional environment-friendly ecological concrete is suitable for multiple scenes.
The above examples are presented for clarity of illustration only and are not limiting of the embodiments. Other variations or modifications of the above description will be apparent to those of ordinary skill in the art, and it is not necessary or exhaustive of all embodiments, and thus all obvious variations or modifications that come within the scope of the invention are desired to be protected.
Claims (8)
1. The multifunctional environment-friendly ecological concrete is characterized by comprising the following raw materials in parts by weight: 50-180 parts of cement, 30-110 parts of saw mud, 30-110 parts of modified sepiolite powder, 900-1500 parts of phosphogypsum coarse aggregate, 5-10 parts of water reducer, 70-170 parts of water, 3-8 parts of potassium polyacrylate, 4-9 parts of polyvinyl acetate emulsion and 3-6 parts of 2-methyl-2, 4-pentanediol solution;
the preparation method of the modified sepiolite powder comprises the following steps: 1) Wet ball milling is carried out on sepiolite powder, saturated NaOH solution and tourmaline are added into the sepiolite powder after ball milling, the solution is electrified, the electrification is stopped after the pH value of the solution reaches neutrality, and the tourmaline is removed, so that modified sepiolite slurry is obtained; 2) Adding an acrolein solution into the modified sepiolite slurry, stirring uniformly, sealing, standing for reaction, drying the slurry after the reaction is finished, washing the obtained solid with water, drying again, repeatedly washing and drying, and grinding the solid into powder to obtain modified sepiolite powder;
the phosphogypsum coarse aggregate is prepared by converting phosphogypsum into semi-hydrated phosphogypsum, mixing the semi-hydrated phosphogypsum with modified sepiolite powder and phthalate for granulation, and then coating with cement; the addition amount of the modified sepiolite powder is 6-10% of the mass of the alpha-semi-hydrated phosphogypsum; the addition amount of the phthalate is 2-3.5% of the mass of the modified sepiolite powder; the mass ratio of the granulated particles to the cement is (4-5): 1, a step of; the 2-methyl-2, 4-pentanediol solution is prepared by mixing 2-methyl-2, 4-pentanediol and a hydrocarbon solvent.
2. The multifunctional environment-friendly ecological concrete according to claim 1, wherein the particle size of the saw mud is less than 0.045mm, siO 2 And Al 2 O 3 The sum of the content is more than 85 percent; the particle size of the modified sepiolite powder is 0.05-0.1 μm, and the specific surface area is 800-1100m 2 /g; the particle size of the phosphogypsum coarse aggregate is 5-15mm, and the density is 600-900kg/m 3 The barrel pressure strength is 8-12MPa.
3. The multifunctional environment-friendly ecological concrete according to claim 1, wherein the tourmaline is one of magnesium tourmaline, ferroelectric tourmaline and lithium tourmaline, the particle size of the tourmaline is more than or equal to 9.6mm, and the mass of the tourmaline is 1/3-1/2 of the mass of sepiolite powder; the electrifying voltage is 30-60V, and the electrifying time is 12-18h.
4. The multifunctional environment-friendly ecological concrete according to claim 1, wherein the preparation method of phosphogypsum coarse aggregate comprises the following steps:
1) Adding phosphogypsum into a salt solution, heating under a pressurizing condition to react, and drying after the reaction to obtain alpha-hemihydrate phosphogypsum;
2) Grinding alpha-semi-hydrated phosphogypsum into powder, adding modified sepiolite powder and phthalate, uniformly mixing, carrying out hydration granulation, carrying out cladding treatment by cement after particle forming, and obtaining phosphogypsum coarse aggregate.
5. A method for preparing the multifunctional environment-friendly ecological concrete according to any one of claims 1 to 4, comprising the following steps:
1) Steam curing is carried out on phosphogypsum coarse aggregate, then the phosphogypsum coarse aggregate is placed in sodium carbonate solution for soaking, and the phosphogypsum coarse aggregate is taken out to obtain pretreated coarse aggregate;
2) Carrying out wet ball milling on saw mud, adding the saw mud subjected to ball milling and water into 2-methyl-2, 4-pentanediol solution, and uniformly mixing to obtain saw mud dispersion slurry;
3) Taking cement, modified sepiolite powder and pretreated coarse aggregate, and uniformly mixing to obtain a dry mixed material;
4) Adding a water reducer, water, potassium polyacrylate and polyvinyl acetate emulsion into the dry blend, uniformly mixing, adding saw mud dispersion slurry, and uniformly mixing again to obtain a blend;
5) And (3) filling the mixture into a mold, and demolding and curing after hardening to obtain the multifunctional environment-friendly ecological concrete.
6. The method for preparing multifunctional environment-friendly ecological concrete according to claim 5, wherein the steam curing is steam curing, and the aqueous solution for generating steam contains 1-4% of ethyl acetate by mass fraction; the steam curing temperature is 60-80 ℃, the humidity is 75-95%, and the curing time is 48-96h.
7. The method for preparing the multifunctional environment-friendly ecological concrete according to claim 5, wherein the concentration of the sodium carbonate solution is 5-10%, and the soaking time is 1-2h.
8. The method for preparing the multifunctional environment-friendly ecological concrete according to claim 5, which is characterized in that the wet ball milling uses an aluminum chloride solution as a grinding aid, the concentration of the aluminum chloride solution is 15-30%, and the mass ratio of the volume of the aluminum chloride solution to the mass of saw mud is (4-16) mL:5g; the diameter of the grinding beads of the wet ball milling is 0.5-1.5mm, and the mass ratio of the grinding beads to the grinding materials is (8-12): 1, grinding time is 1-3h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211280438.0A CN115650664B (en) | 2022-10-19 | 2022-10-19 | Multifunctional environment-friendly ecological concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211280438.0A CN115650664B (en) | 2022-10-19 | 2022-10-19 | Multifunctional environment-friendly ecological concrete and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115650664A CN115650664A (en) | 2023-01-31 |
| CN115650664B true CN115650664B (en) | 2023-07-14 |
Family
ID=84989200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211280438.0A Active CN115650664B (en) | 2022-10-19 | 2022-10-19 | Multifunctional environment-friendly ecological concrete and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115650664B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116253557A (en) * | 2023-03-14 | 2023-06-13 | 上海泽丰半导体科技有限公司 | Ceramic casting slurry, preparation method thereof and ceramic casting green tape |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7067943B2 (en) * | 2018-02-09 | 2022-05-16 | 太平洋セメント株式会社 | Additives for soil granulation |
| CN111333381B (en) * | 2020-04-16 | 2021-11-23 | 国家林业和草原局昆明勘察设计院 | Ecological concrete and preparation method thereof |
| CN112759337A (en) * | 2021-03-09 | 2021-05-07 | 山东晟世达科技有限公司 | Active powder concrete with high-content solid waste and preparation and use method thereof |
| CN113248205A (en) * | 2021-05-26 | 2021-08-13 | 武汉来道建材科技有限公司 | Large-mixing-amount solid waste non-steamed lightweight concrete wallboard and preparation method thereof |
-
2022
- 2022-10-19 CN CN202211280438.0A patent/CN115650664B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115650664A (en) | 2023-01-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wu et al. | Utilization of the circulating fluidized bed combustion ash in autoclaved aerated concrete: Effect of superplasticizer | |
| CN111792902B (en) | High-strength water-resistant phosphogypsum composite cementing material and preparation method thereof | |
| CN112028564B (en) | By using CO2Recycled concrete block prepared from reinforced recycled powder | |
| CN101033124A (en) | Method of preparing thermal insulating mortar from solid waste | |
| CN113336516A (en) | Cementing material prepared from multi-element solid wastes and cooperative regulation and control method thereof | |
| Khan et al. | Effect of Microsilica on Strength and Microstructure of the GGBS-based Cement composites | |
| Sinsiri et al. | The effects of replacement fly ash with diatomite in geopolymer mortar | |
| Aminudin et al. | Properties of agro-industrial aerated concrete as potential thermal insulation for building | |
| CN115650664B (en) | Multifunctional environment-friendly ecological concrete and preparation method thereof | |
| CN112441797A (en) | Environment-friendly admixture concrete and preparation method thereof | |
| CN1915887A (en) | Method for preparing sandwich type ceramic aggregates free from burning by using waste of ceramics | |
| CN113831152A (en) | All-solid-waste high-strength permeable geopolymer concrete and preparation method thereof | |
| CN114436613A (en) | Treatment-free saw mud based cementing material and preparation method and application thereof | |
| CN112159178B (en) | Concrete containing waste brick powder and fly ash | |
| KR101611430B1 (en) | A environmental-friendly surface finishing additives of buildings, surface finishing composition comprising the same and environmental-friendly surface finishing of buildings | |
| KR101611441B1 (en) | A Environmental-friendly Plastering additives Containing Natural Mineral Powder and Environmental-friendly Plastering Cement and Mortar Containing the Same | |
| CN104876464B (en) | A kind of graft-modification method of fiber reinforced flyash | |
| CN114230299B (en) | Full-solid-waste high-performance light material and preparation method and application thereof | |
| CN113149580B (en) | Recycled foam concrete and preparation method thereof | |
| CN112209647B (en) | Green energy-saving artificial lightweight aggregate and preparation method thereof | |
| CN114933455A (en) | Novel concrete | |
| CN115073093A (en) | Low-shrinkage high-strength self-compacting recycled concrete and preparation method thereof | |
| CN111574197B (en) | Method for preparing light ceramic sand particles from coal kiln ash and application thereof | |
| CN114180709A (en) | Method for preparing porous steam-cured phosphorus removal biological filter material by utilizing waste foundry clay sand | |
| KR101611426B1 (en) | A environmental-friendly surface finishing additives of buildings, surface finishing composition comprising the same and environmental-friendly surface finishing of buildings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |