CN112408905B - Baking-free antique black brick based on construction waste tailings and preparation method and application thereof - Google Patents
Baking-free antique black brick based on construction waste tailings and preparation method and application thereof Download PDFInfo
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- CN112408905B CN112408905B CN202011290655.9A CN202011290655A CN112408905B CN 112408905 B CN112408905 B CN 112408905B CN 202011290655 A CN202011290655 A CN 202011290655A CN 112408905 B CN112408905 B CN 112408905B
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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
- 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
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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
- C04B2111/54—Substitutes for natural stone, artistic materials or the like
- C04B2111/547—Imitating ancient compositions, e.g. mediaeval mortars; Compositions specially designed for restauration of ancient buildings or building elements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to the field of environment-friendly building materials, and particularly discloses a baking-free antique blue brick based on construction waste tailings, and a preparation method and application thereof. The preparation method provided by the invention is simple, the prepared building material has the advantages of low production cost, high building block strength, good physical waterproof effect, long service life and the like, the current situation that a large amount of carbon is discharged when most of the existing black brick building blocks are manufactured by adopting a sintering method is solved, the problem that the environment is easily polluted because most of construction waste tailings are subjected to landfill treatment in the prior art is solved, and the market prospect is wide.
Description
Technical Field
The invention relates to the field of environment-friendly building materials, in particular to a baking-free antique blue brick based on construction waste tailings and a preparation method and application thereof.
Background
At present, at least 20-30 million tons of construction wastes are generated in China every year, wherein plastics, wood substances, metals and the like generated in the early stage can be basically recycled, primary aggregates, secondary aggregates and fine aggregates generated after buildings are crushed can be directly sold according to a conventional disposal method to obtain profits, and the most difficult to treat are construction waste tailings, such as engineering residue soil and crushed tailing powder, and the construction waste tailings are difficult to recycle in a recycling manner in the domestic prior art due to the factors of large soil content, complex components, fine particles and the like.
For the construction waste tailings, an effective and sustainable utilization way is lacked at home at present, the common method is to bury the tailings powder, the cost of transportation, field and the like occupied by the way is very high, and the environmental protection problems of land occupation and secondary dust emission generally exist. Therefore, the above technical solutions have the following disadvantages in practical use: in the prior art, the construction waste tailings cannot be utilized, the problem that a large amount of cultivated land is needed to be buried exists, and harmless and efficient utilization of the construction waste tailings cannot be realized.
Disclosure of Invention
The embodiment of the invention aims to provide a baking-free antique blue brick based on construction waste tailings, and aims to solve the problem that most of the construction waste tailings in the prior art are subjected to landfill treatment, so that the environment is easily polluted.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a baking-free antique blue brick based on construction waste tailings comprises the following raw materials: construction waste tailings, curing agents (also called additional curing agents, curing additives, additives and the like), cement, coloring agents and water; the baking-free antique blue brick based on the construction waste tailings is manufactured by adopting a hydraulic forming method (particularly a high-density hydraulic forming method); the raw materials of the curing agent comprise phenolic resin, sodium alginate and liquid silicon dioxide (mSiO)2·nH2O, m, n may be greater than 0) and an inorganic solvent.
As a further scheme of the invention: the baking-free antique blue brick based on the construction waste tailings has the average compression strength of more than 10Mpa in 28d (28 days), the water absorption rate of less than 10 percent, the density of a solid part of 1800-plus-material 2000 g/cubic centimeter, the softening coefficient of not less than 0.8 and the loss rate of 25 times of freeze-thaw cycle strength of not more than 10 percent.
As a still further scheme of the invention: the construction waste tailings are powder generated after a building is crushed (for example, after house demolition waste is crushed) and/or tailings remained after high-quality usable aggregates are selected from the powder, the soil content of the construction waste tailings is less than 70wt%, the particle size is 0.1-3mm, and the natural water content is less than 15 wt%.
Another object of the embodiments of the present invention is to provide a method for preparing a baking-free antique black brick based on construction waste tailings (i.e., a method for producing a baking-free antique black brick by using construction waste tailings), wherein the method for preparing a baking-free antique black brick based on construction waste tailings comprises the following steps:
weighing an inorganic solvent (preferably deionized water), sodium alginate, phenolic resin, liquid silicon dioxide and the like according to a proportion, heating, stirring and mixing uniformly in a reaction kettle to prepare a curing agent;
weighing water according to a proportion, adding the water into the curing agent, and uniformly mixing to obtain a diluent;
weighing the construction waste tailings, the cement and the colorant according to the proportion, uniformly mixing, and then uniformly mixing (in a spraying manner) with the diluent to obtain a mixture;
and (3) performing hydraulic (extrusion) molding on the mixture, and maintaining (specifically, moisturizing and maintaining) for 7-15d to obtain the baking-free antique blue brick based on the construction waste tailings, wherein the baking-free antique blue brick can be used as an antique blue brick building block product.
The other purpose of the embodiment of the invention is to provide the baking-free antique blue brick based on the construction waste tailings, which is prepared by the preparation method of the baking-free antique blue brick based on the construction waste tailings.
The embodiment of the invention also aims to provide application of the baking-free antique blue brick based on the construction waste tailings in building construction. The brick can be particularly used as an antique blue brick building block in building construction.
Compared with the prior art, the invention has the beneficial effects that:
the baking-free antique blue brick based on the construction waste tailings provided by the invention takes the construction waste tailings, a curing agent, cement, a coloring agent, water and the like as raw materials, the prepared baking-free antique blue brick is high in strength and excellent in water resistance and ageing resistance, the antique blue brick is produced by adopting a chemical modification mode to serve as a construction material, and meanwhile, the density of the construction material is greatly improved by adopting a high-density hydraulic forming method, so that harmless and efficient utilization of the construction waste tailings can be promoted. The preparation method provided by the invention is simple, and compared with a green brick product obtained by sintering, the prepared building material has the advantages of low production cost, high building block strength, good physical waterproof effect, long service life and the like, solves the current situation that a large amount of carbon is discharged when most of the existing green brick building blocks are manufactured by adopting a sintering method, and simultaneously solves the problem that the environment is easily polluted because most of construction waste tailings are subjected to landfill treatment in the prior art.
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Fig. 1 is a process circuit diagram of a preparation method of a baking-free antique black brick based on construction waste tailings provided by an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The embodiment of the invention provides a baking-free antique blue brick based on construction waste tailings, which comprises the following raw materials: construction waste tailings, curing agents (also called additional curing agents, curing additives, additives and the like), cement, coloring agents and water; the baking-free antique blue brick based on the construction waste tailings is manufactured by adopting a hydraulic forming method (particularly a high-density hydraulic forming method); the raw materials of the curing agent comprise phenolic resin, sodium alginate and liquid silicon dioxide (mSiO)2·nH2O, m, n may be greater than 0) and an inorganic solvent.
As another preferred embodiment of the invention, the baking-free antique blue brick based on the construction waste tailings has the average compression strength of more than 10MPa in 28d (28 days), the water absorption rate of less than 10 percent, the density of the solid part of 1800-2000 g/cc, the softening coefficient of not less than 0.8 and the strength loss rate of 25 times of freeze-thaw cycles of not more than 10 percent.
As another preferable embodiment of the invention, the construction waste tailings are powder generated after crushing of buildings (for example, after crushing of house demolition waste) and/or tailings remaining after selecting high-quality usable aggregates from the powder, the soil content of the construction waste tailings is less than 70wt%, the particle size is 0.1-3mm, and the natural water content is less than 15 wt%.
As another preferred embodiment of the present invention, the liquid silica has an average particle diameter of 10 to 12nm and a solid content of 40 to 60% by weight.
Preferably, the liquid silica is required to be a commercially available nanoscale liquid basic silica having an average particle size of 11.6nm and a solids content of 50 wt%.
As another preferred embodiment of the invention, the baking-free antique blue brick based on the construction waste tailings mainly comprises the following raw materials in parts by weight: 80-95 parts of construction waste tailings, 0.02-0.03 part of curing agent, 8-10 parts of cement, 0.8-1 part of colorant and 8-12 parts of water.
As another preferred embodiment of the present invention, the water, which is one of the raw materials of the non-fired antique blue brick based on the construction waste tailings, is non-polluted normal surface water or tap water in an amount of 8 to 12 wt% of the total mass of the construction waste tailings, the cement, the curing agent and the colorant.
As another preferred embodiment of the present invention, the inorganic solvent may be any one selected from purified water, mineral water, distilled water, deionized water, and soft water, and is not limited thereto and may be selected as needed, and is preferably deionized water.
As another preferred embodiment of the present invention, the curing agent comprises, in parts by weight: 40-50 parts of inorganic solvent (preferably deionized water), 20-25 parts of phenolic resin, 1-1.5 parts of sodium alginate and 25-30 parts of liquid silicon dioxide.
As another preferred embodiment of the present invention, the curing agent is used in an amount of 0.02 to 0.03 wt% of the total mass of the construction waste tailings, the cement, the curing agent and the colorant; the using amount of the cement is 8-10 wt% of the total mass of the construction waste tailings, the cement, the curing agent and the colorant; the using amount of the colorant is 0.8-1 wt% of the total mass of the construction waste tailings, the cement, the curing agent and the colorant.
As another preferred embodiment of the present invention, the cement is preferably any one of 42.5 (reference numeral) portland cement or 52.5 (reference numeral) portland cement.
Preferably, the cement is 42.5 Portland cement.
As another preferred embodiment of the invention, the sodium alginate is a commercially available water-soluble industrial sodium alginate powdery chemical, the content of which is more than 50%, the pH value is 7-8, the viscosity is 120map.s, and the molecular equivalent is 20-30 ten thousand units.
As another preferred embodiment of the present invention, the phenolic resin is a commercially available powdery water-soluble sulfonated phenolic resin, and has a resin content of not less than 90 wt% and a NaCl content of less than 1 wt%.
Preferably, the phenolic resin is a commercially available powdery water-soluble sulfonated phenolic resin, the resin content is 90 wt%, and the NaCl content is less than 1 wt%.
As another preferable embodiment of the present invention, the colorant has a ferroferric oxide content of not less than 98 wt% and a particle size of not more than 0.2 μm.
Preferably, the colorant is a commercial iron oxide black pigment, the content of ferroferric oxide is not less than 98 wt%, and the particle size is not more than 0.2 μm.
The baking-free antique blue brick based on the construction waste tailings has high strength and excellent water resistance and ageing resistance, is prepared by adopting the construction waste tailings, cement, a curing agent, a coloring agent and the like as raw materials and utilizing a chemical modification mode, and has the advantages of good cost performance, low water absorption of the building blocks, small freezing and thawing loss resistance, carbonization coefficient, softening coefficient and other excellent performances compared with the common baking-free brick. Meanwhile, the density of the building block is greatly improved by adopting a hydraulic forming method, the clean and efficient utilization of waste building waste tailings can be promoted, the sustainable and healthy development of the resource industry of the building waste is realized, and the problems that the waste building waste is difficult to treat, the environment is polluted by adopting a sintering method for the existing grey brick building block, a large amount of aggregates are required to be doped in other baking-free bricks, the strength of the material is low, the water resistance is poor and the service life is short are solved. The preparation method provided by the invention is simple, and compared with the regeneration building block made of general building wastes, the prepared baking-free antique blue brick as the building block has the advantages of high density, good physical waterproof effect, high strength, neat appearance, uniform color and the like, and simultaneously solves the problems of high production energy consumption, high carbon emission and environmental pollution caused by the fact that most of the existing blue bricks are made by adopting a sintering method, and has wide market prospect.
Another object of the embodiment of the present invention is to provide a method for preparing a baking-free antique black brick based on construction waste tailings (i.e., a method for manufacturing a baking-free antique black brick from construction waste tailings), wherein the method for preparing a baking-free antique black brick based on construction waste tailings comprises the following steps:
weighing an inorganic solvent (preferably deionized water), sodium alginate, phenolic resin, liquid silicon dioxide and the like according to a proportion, heating, stirring and mixing uniformly in a reaction kettle to prepare a curing agent;
weighing water according to a proportion, adding the water into the curing agent, and uniformly mixing to obtain a diluent;
weighing the construction waste tailings, the cement and the colorant according to the proportion, uniformly mixing, and then uniformly mixing (in a spraying manner) with the diluent to obtain a mixture;
and (3) performing hydraulic (extrusion) molding on the mixture, and maintaining (specifically, moisturizing and maintaining) for 7-15d to obtain the baking-free antique blue brick based on the construction waste tailings, wherein the baking-free antique blue brick can be used as an antique blue brick building block product.
As another preferred embodiment of the present invention, the forming pressure of the hydroforming is not less than 15 MPa.
Preferably, the hydraulic forming specifically adopts a bidirectional static pressure forming machine, and the forming pressure is not less than 15 MPa. The maintenance is required to be carried out for 10-15d in a moisture-preserving environment.
As another preferred embodiment of the invention, the hydraulic forming is to use a conveying device and a weighing and distributing system to send the mixed mixture into a two-way static pressure forming machine, generally 600 and 1500 tons, and a single-block forming pressure is 15-20MPa, pressing is 15-20s, and demolding and forming.
As another preferred embodiment of the present invention, in the preparation method of the baking-free antique grey brick based on the construction waste tailings, the preparation method of the curing agent specifically comprises: weighing an inorganic solvent (preferably deionized water) according to a proportion, heating to 65-75 ℃, then adding sodium alginate, heating to 78-82 ℃, uniformly mixing, keeping the temperature for 0.5-2.5h, cooling to 35-45 ℃, then adding phenolic resin, uniformly mixing until the phenolic resin is completely dissolved, cooling to 16-26 ℃, adding liquid silicon dioxide, fully stirring and uniformly mixing, and filtering to obtain the curing agent.
Preferably, the preparation method of the curing agent comprises the following steps: firstly, injecting 45-50 parts by weight of deionized water into a reaction kettle with a heating system, heating to 70 ℃, adding 1-2 parts by weight of sodium alginate, stirring for 20min, heating to raise the temperature in the reaction kettle to 80 ℃, and preserving the temperature for 1 h; cooling to 40 ℃; adding 20-25 parts by weight of sulfonated phenolic resin, stirring for 1h until the sulfonated phenolic resin is completely dissolved, and naturally cooling to 20 ℃; adding 25-30 parts by weight of liquid silicon dioxide and fully stirring; measuring the density to be about 1.25-1.28, and filtering to obtain the curing agent of the invention.
Another object of the embodiment of the invention is to provide the baking-free antique black brick based on the building waste tailings, which is prepared by the preparation method of the baking-free antique black brick based on the building waste tailings, and has the characteristics of better cost performance than common baking-free bricks, low water absorption of building blocks, small freezing and thawing loss resistance, carbonization coefficient, softening coefficient and other performances.
The high-quality baking-free antique blue brick (building block) based on the construction waste tailings obtained by the invention has the following main principle:
1. the sodium alginate adopted by the invention is polysaccharide carbohydrate, and can quickly generate ion exchange when meeting calcium ions, and the calcium ions are stacked to form a cross-linked network structure to generate gel. By utilizing the property, the sodium alginate and a large amount of calcium ions in the construction waste tailings (powder) form gel and have irreversibility. The hydrogel has strong viscosity, can tightly combine the tailing particles of the construction waste, plays a role in filling pores and increasing density, and enables the building block to have strong anti-permeability and compressive strength. The sodium alginate is characterized by strong caking property when dissolved in alkaline solution, and the phenolic resin and the liquid silicon dioxide are alkaline, which is particularly beneficial to the plasticity of construction waste tailings mixed with silt.
2. The liquid silicon dioxide adopted by the invention is colloidal sol of inorganic polymer polymetaphosphoric acid taking water as a dispersion medium, is based on that silicon dioxide particles are more in spherical single or multiple conglomerate dispersion, can be firmly attached to the surface of the tailing particles of the building rubbish and continuously evaporate along with moisture. The silica particles can form strong Si-O bonds between them to form a continuous coating film. The silica gel has the characteristics of large fine specific surface area, more activity during gel separation, capability of generating a new silicate inorganic high molecular compound with certain inorganic salts and metal oxides, hardening to form a film and strong permeability; at the same time, it can produce calcium silicate and silicate with free calcium oxide in the cement, so that the building block has greater strength, and the dehydrated silicon dioxide can no longer be dissolved in water, so that the building block has excellent water resistance.
3. The sulfonated phenolic resin adopted by the invention is a novel aqueous alkaline cation exchange resin, has good mechanical property, is beneficial to improving the compression resistance and the fracture resistance of the building block, and has water reducing property, thereby being beneficial to carrying out good hydration reaction on the premise of less external water doping amount of the added cement. The sulfonated phenolic resin has larger pores among ions and strong adsorption capacity and high reaction speed, so that ionic and nonionic toxic and harmful substances in the building waste tailings and heavy metal ions such as copper, iron, mercury, cadmium, chromium, arsenic, lead and the like can be effectively adsorbed and harmlessly modified, and the environmental protection safety of the building block can be ensured to a certain extent by utilizing the characteristic.
4. The black iron oxide is used as a coloring agent, so that the baking-free black brick building block has the characteristics of good fineness, high dispersibility, uniform color and good aging resistance, and the color can achieve a better aesthetic effect with the sintered black brick building block.
The embodiment of the invention also aims to provide application of the baking-free antique blue brick based on the construction waste tailings in building construction.
As another preferred embodiment of the invention, the application can be made into standard quasi bricks, non-standard bricks, paving bricks, city wall bricks, antique green tiles and the like for building construction, and compared with common baking-free bricks, the brick has the characteristics of good cost performance, low water absorption of the building blocks, small freeze-thaw loss resistance, superior carbonization coefficient, softening coefficient and other performances, and can promote clean and efficient utilization of waste building waste tailings and sustainable and healthy development of the building waste recycling industry.
The technical effects of the baking-free antique blue brick based on the construction waste tailings of the invention are further described by the following specific examples.
Example 1
A baking-free antique blue brick based on construction waste tailings is prepared by the following specific preparation method (shown in figure 1):
1) preparation of curing agent (curing admixture): firstly, injecting 440kg of deionized water into a reaction kettle with a heating system, heating to 70 ℃, adding 10kg of sodium alginate, stirring for 20min, heating to raise the temperature in the reaction kettle to 80 ℃, and preserving the temperature for 1 h; cooling to 40 ℃; adding 250kg of sulfonated phenolic resin, stirring for 1h until the sulfonated phenolic resin is completely dissolved, and naturally cooling to 20 ℃; adding 300kg of liquid silicon dioxide and fully stirring; measuring the density to be 1.26g/mL, and filtering to obtain the curing agent with the formula of the embodiment for later use;
2) stirring the mixture: weighing 900kg of construction waste tailings, 90kg of cement and 10kg of colorant, and uniformly mixing for 2-3min to obtain dry mixture; simultaneously, 0.3kg of the curing admixture is diluted with 10 wt% of water of the dry mixture, namely 100kg of water is diluted to obtain a diluted solution for later use; adding the diluent into the mixed dry mixture by using spray type water adding equipment, and fully mixing for 5min to obtain a mixture for later use;
3) and (3) pressing and forming: conveying the mixed mixture into a 200-ton bidirectional static pressure device by using a conveying device and a weighing and distributing system, pressing a 240X 115X 53mm standard brick, pressing a single block at a forming pressure of 15MPa, and demoulding for 20 s;
4) and (5) maintenance: and (3) curing for 15 days under the moisture-preserving condition to obtain the baking-free antique blue brick based on the construction waste tailings, namely the baking-free antique blue brick serving as the baking-free antique blue brick can leave a factory. The 28-day test shows that the compressive strength is 14.05Mpa, and the standard of the strength of the MU10 (namely, the compressive strength of the MU10 is 10MP) wall brick is met.
Example 2
A baking-free antique blue brick based on construction waste tailings is prepared by the following specific preparation method (shown in figure 1):
1) preparation of curing agent (curing admixture): 438kg of deionized water is firstly injected into a reaction kettle with a heating system, the mixture is heated to 70 ℃, 12kg of sodium alginate is added, the mixture is stirred for 20min, and simultaneously the mixture is heated to raise the temperature in the reaction kettle to 80 ℃ and is kept warm for 1 h; cooling to 40 ℃; adding 250kg of sulfonated phenolic resin, stirring for 1h until the sulfonated phenolic resin is completely dissolved, and naturally cooling to 20 ℃; adding 300kg of liquid silicon dioxide and fully stirring; measuring the density to be about 1.27g/mL, and filtering to obtain the curing agent with the formula of the embodiment for later use;
2) stirring the mixture: weighing 900kg of construction waste tailings, 90kg of cement and 10kg of colorant, and uniformly mixing for 2-3min to obtain dry mixture; simultaneously, 0.3kg of the curing admixture is diluted with 10 wt% of water of the dry mixture, namely 100kg of water is diluted to obtain a diluted solution for later use; adding the diluent into the mixed dry mixture by using spray type water adding equipment, and fully mixing for 5min to obtain a mixture for later use;
3) and (3) pressing and forming: conveying the mixed mixture into a 200-ton bidirectional static pressure device by using a conveying device and a weighing and distributing system, pressing a 240X 115X 53mm standard brick, pressing a single block at a forming pressure of 15MPa, and demoulding for 20 s;
4) and (5) maintenance: curing for 15 days under the moisture-preserving condition to obtain the baking-free antique blue brick based on the construction waste tailings, namely the baking-free antique blue brick serving as the baking-free antique blue brick can leave a factory; the 28-day test shows that the compressive strength is 14.12Mpa, and the standard of the strength of the MU10 (namely, the compressive strength of the MU10 is 10MP) wall brick is met.
Example 3
A baking-free antique blue brick based on construction waste tailings is prepared by the following specific preparation method (shown in figure 1):
1) preparation of curing agent (curing admixture): 435kg of deionized water is firstly injected into a reaction kettle with a heating system, the reaction kettle is heated to 70 ℃, 15kg of sodium alginate is added, the stirring is carried out for 20min, the reaction kettle is heated to 80 ℃ at the same time, and the temperature is kept for 1 h; cooling to 40 ℃; adding 250kg of sulfonated phenolic resin, stirring for 1h until the sulfonated phenolic resin is completely dissolved, and naturally cooling to 20 ℃; adding 300kg of liquid silicon dioxide and fully stirring; measuring the density to be about 1.28g/mL, and filtering to obtain the curing agent with the formula of the embodiment for later use;
2) stirring the mixture: weighing 900kg of construction waste tailings, 90kg of cement and 10kg of colorant, and uniformly mixing for 2-3min to obtain dry mixture; simultaneously, 0.3kg of the curing admixture is diluted with 10 wt% of water of the dry mixture, namely 100kg of water is diluted to obtain a diluted solution for later use; adding the diluent into the mixed dry mixture by using spray type water adding equipment, and fully mixing for 5min to obtain a mixture for later use;
3) and (3) pressing and forming: conveying the mixed mixture into a 200-ton bidirectional static pressure device by using a conveying device and a weighing and distributing system, pressing a 240X 115X 53mm standard brick, pressing a single block at a forming pressure of 15MPa, and demoulding for 20 s;
4) and (5) maintenance: and (3) curing for 15 days under the moisture-preserving condition to obtain the baking-free antique blue brick based on the construction waste tailings, namely the baking-free antique blue brick serving as the baking-free antique blue brick can leave a factory. The compressive strength of the brick after 28 days is 16.87Mpa, and the brick meets the strength standard of MU15 (namely, the compressive strength of the brick is 15 MP).
In this example, in order to investigate the effect of the amount of sodium alginate mixed in the curing agent on the product performance, the compressive strength performance of the baking-free antique blue bricks based on the construction waste tailings prepared in examples 1-2 and this example was counted, and the specific results are shown in table 1.
TABLE 1 Effect of sodium alginate content in curing admixtures on product Properties
In table 1, the mixing amount of each raw material is calculated according to the mass percentage, and it can be seen from the data in table 1 that, on the premise that the phenolic resin and the liquid silicon dioxide are in a certain amount, when the sodium alginate is added in an amount of 1.5%, and on the same premise that 9% of cement is used, 0.03% of the curing agent of the invention is added, the strength value of the obtained unfired antique black brick based on the construction waste tailings is the highest.
Example 4
A baking-free antique blue brick based on construction waste tailings is prepared by the following specific preparation method (shown in figure 1):
1) preparation of curing agent (curing admixture): 485kg of deionized water is firstly injected into a reaction kettle with a heating system, the reaction kettle is heated to 70 ℃, 15kg of sodium alginate is added, the stirring is carried out for 20min, the reaction kettle is heated to 80 ℃ at the same time, and the temperature is kept for 1 h; cooling to 40 ℃; adding 200kg of sulfonated phenolic resin, stirring for 1h until the sulfonated phenolic resin is completely dissolved, and naturally cooling to 20 ℃; adding 300kg of liquid silicon dioxide and fully stirring; measuring the density to be 1.25g/mL, and filtering to obtain the curing agent with the formula of the embodiment for later use;
2) stirring the mixture: weighing 900kg of construction waste tailings, 90kg of cement and 10kg of colorant, and uniformly mixing for 2-3min to obtain dry mixture; simultaneously, 0.3kg of the curing admixture is diluted with 10 wt% of water of the dry mixture, namely 100kg of water is diluted to obtain a diluted solution for later use; adding the diluent into the mixed dry mixture by using spray type water adding equipment, and fully mixing for 5min to obtain a mixture for later use;
3) and (3) pressing and forming: conveying the mixed mixture into 1200-ton bidirectional static pressure equipment by using a conveying device and a weighing and distributing system, pressing the mixed mixture into a standard brick with the size of 240 multiplied by 115 multiplied by 53mm, pressing the standard brick into a single block with the forming pressure of 15MPa, and demoulding and forming the brick for 20 seconds;
4) and (5) maintenance: and (3) curing for 15 days under the moisture-preserving condition to obtain the baking-free antique blue brick based on the construction waste tailings, namely the baking-free antique blue brick serving as the baking-free antique blue brick can leave a factory. The 28-day test shows that the compressive strength is 14.98Mpa, meets the MU10 (namely, the compressive strength of the brick is 10MP) strength standard of the wall brick, and is almost close to MU 15.
Example 5
The procedure of example 4 was repeated, except that the weight of deionized water injected into the autoclave equipped with a heating system was 455kg, the weight of the sulfonated phenol resin added was 230kg, and the measured density of the obtained curing agent was about 1.26g/mL, as compared with that of example 4.
In the embodiment, the prepared baking-free antique blue brick based on the construction waste tailings has the compression strength of 15.06MPa after 28 days, and meets the strength standard of MU15 (namely, the compression strength of the brick is 15MP) wall bricks.
Example 6
The procedure of example 4 was repeated, except that the weight of deionized water injected into the autoclave equipped with a heating system was 455kg, the weight of the sulfonated phenol resin added was 250kg, and the measured density of the obtained curing agent was about 1.28g/mL, as compared with that of example 4.
In the embodiment, the prepared baking-free antique blue brick based on the construction waste tailings has the compression strength of 16.87MPa after 28 days and exceeds the strength standard of MU15 (namely, the compression strength of the brick is 15 MP).
In this example, in order to investigate the effect of the amount of phenolic resin added into the curing agent on the product performance, the compressive strength performance of the baking-free antique black bricks based on the construction waste tailings prepared in examples 4-5 and this example was counted, and the specific results are shown in table 2.
TABLE 2 influence of the amount of phenolic resin in the curing admixture on the product Properties
In table 2, the mixing amount of each raw material is calculated according to the mass percentage, and it can be seen from the data in table 2 that, on the premise that sodium alginate and liquid silicon dioxide are in a certain amount, when the amount of phenolic resin is 25%, and on the same premise that 9% cement is used, 0.03% of the curing agent of the present invention is added, the strength value of the obtained unfired antique black brick based on the construction waste tailings is the highest.
Example 7
A baking-free antique blue brick based on construction waste tailings is prepared by the following specific preparation method (shown in figure 1):
1) preparation of curing agent (curing admixture): 485kg of deionized water is firstly injected into a reaction kettle with a heating system, the reaction kettle is heated to 70 ℃, 15kg of sodium alginate is added, the stirring is carried out for 20min, the reaction kettle is heated to 80 ℃ at the same time, and the temperature is kept for 1 h; cooling to 40 ℃; adding 250kg of sulfonated phenolic resin, stirring for 1h until the sulfonated phenolic resin is completely dissolved, and naturally cooling to 20 ℃; adding 250kg of liquid silicon dioxide and fully stirring; measuring the density to be 1.25g/mL, and filtering to obtain the curing agent with the formula of the embodiment for later use;
2) stirring the mixture: weighing 900kg of construction waste tailings, 90kg of cement and 10kg of colorant, and uniformly mixing for 2-3min to obtain dry mixture; simultaneously, 0.3kg of the curing admixture is diluted with 10 wt% of water of the dry mixture, namely 100kg of water is diluted to obtain a diluted solution for later use; adding the diluent into the mixed dry mixture by using spray type water adding equipment, and fully mixing for 5min to obtain a mixture for later use;
3) and (3) pressing and forming: conveying the mixed mixture into 1200-ton bidirectional static pressure equipment by using a conveying device and a weighing and distributing system, pressing the mixed mixture into a standard brick with the size of 240 multiplied by 115 multiplied by 53mm, pressing the standard brick into a single block with the forming pressure of 15MPa, and demoulding and forming the brick for 20 seconds;
4) and (5) maintenance: and (3) curing for 15 days under the moisture-preserving condition to obtain the baking-free antique blue brick based on the construction waste tailings, namely the baking-free antique blue brick serving as the baking-free antique blue brick can leave a factory. The compressive strength is 15.02Mpa after 28 days of detection, and the standard of the strength of the MU15 (namely the compressive strength of the MU15 is 15MP) wall brick is met.
Example 8
The procedure of example 7 was repeated, except that the weight of deionized water charged in the autoclave equipped with a heating system was 465kg, the weight of liquid silica charged in the autoclave was 270kg, and the measured density of the obtained curing agent was about 1.26g/mL, as compared with that of example 7.
In the embodiment, the prepared baking-free antique blue brick based on the construction waste tailings has the compression strength of 15.82MPa after 28 days and exceeds the strength standard of MU15 wall bricks.
Example 9
The procedure of example 7 was repeated, except that the weight of deionized water previously charged into the reaction vessel equipped with a heating system was 455kg, the weight of the liquid silica charged was 300kg, and the measured density of the obtained curing agent was about 1.28g/mL, as compared with that of example 7.
In the embodiment, the prepared baking-free antique blue brick based on the construction waste tailings has the compression strength of 16.87MPa after 28 days and exceeds the strength standard of MU15 (namely, the compression strength of the brick is 15 MP).
In this example, in order to investigate the effect of the amount of liquid silica mixed in the curing agent on the product performance, the compressive strength performance of the baking-free antique blue bricks based on the construction waste tailings prepared in examples 7-8 and this example was counted, and the specific results are shown in table 3.
TABLE 3 Effect of the amount of liquid silica incorporated into the curing admixture on product Properties
In table 3, the amount of each raw material is calculated according to the mass percentage, and it can be seen from the data in table 3 that, on the premise that sodium alginate and phenolic resin are in a certain amount, when the amount of liquid silicon dioxide is 30%, and on the same premise that 9% cement is used, 0.03% of the curing agent of the present invention is added, the strength value of the obtained unfired antique black brick based on the construction waste tailings is the highest.
Therefore, as can be seen from the data in tables 1, 2 and 3, the optimum mixing ratio of the admixture is 1.5% of sodium alginate, 25% of phenolic resin and 30% of liquid silicon dioxide, only 9% of cement is required, and 0.03% of the curing agent is additionally added, and the main performance of the admixture in 28d can exceed the current standard of the wall brick of MU 15.
In order to test the product performance and the optimum mixing ratio of the present invention to examine the benefits of the present invention, the mixing amount of the curing agent was compared. The optimal formula is used for curing the admixture (the optimal scheme in the embodiments 3, 6 and 9 is selected), different addition amounts are adopted, and under the condition that the dosages of the construction waste tailings and the cement are fixed, key index detection is carried out according to GB/T21144-2007 concrete solid bricks, GB/T2542-2012 wall building brick test methods and other related existing provisions, so that the optimal cost performance ratio is obtained.
Example 10
A baking-free antique blue brick based on construction waste tailings is prepared by the following specific preparation method (shown in figure 1):
1) preparation of curing agent (curing admixture): preparation of curing agent (curing admixture): 435kg of deionized water is firstly injected into a reaction kettle with a heating system, the reaction kettle is heated to 70 ℃, 15kg of sodium alginate is added, the stirring is carried out for 20min, the reaction kettle is heated to 80 ℃ at the same time, and the temperature is kept for 1 h; cooling to 40 ℃; adding 250kg of sulfonated phenolic resin, stirring for 1h until the sulfonated phenolic resin is completely dissolved, and naturally cooling to 20 ℃; adding 300kg of liquid silicon dioxide and fully stirring; measuring the density to be about 1.28g/mL, and filtering to obtain the curing agent with the formula of the embodiment for later use;
2) stirring the mixture: weighing 900kg of construction waste tailings, 90kg of 42.5 kg of Portland cement and 10kg of black iron oxide colorant, and uniformly mixing for 3min to obtain dry mixture; simultaneously, 0.2kg of the curing agent is diluted with 10 wt% of water of the dry mixture, namely 100kg of water is diluted to obtain a diluent for later use; adding the diluent into the mixed dry mixture by using spray type water adding equipment, and fully mixing for 5min to obtain a mixture for later use;
3) and (3) pressing and forming: conveying the mixed mixture into 1200-ton bidirectional static pressure equipment by using a conveying device and a weighing and distributing system, pressing the mixed mixture into a standard brick with the size of 240 multiplied by 115 multiplied by 53mm, pressing the standard brick into a single block with the forming pressure of 15MPa, and demoulding and forming the brick for 20 seconds;
4) and (5) maintenance: and (3) curing for 15 days under the moisture-preserving condition to obtain the baking-free antique blue brick based on the construction waste tailings, namely the baking-free antique blue brick serving as the baking-free antique blue brick can leave a factory. The 28-day compressive strength is detected to be 15.06Mpa, the strength standard of the MU15 (namely the compressive strength of the MU15 is indicated to be 15MP) wall brick is met, the water absorption rate is 11.2 percent, and the freeze-thaw loss rate for 25 times is 9.5 percent.
Example 11
The same procedure as in example 10 was repeated, except that the amount of the curing agent added was 0.25kg as compared with example 10.
In the embodiment, the compressive strength of the prepared baking-free antique blue brick based on the construction waste tailings is 15.97Mpa after 28 days, the strength standard of the MU15 wall brick is completely met, the water absorption rate is 7.6%, the freeze-thaw loss rate for 25 times is 8.8%, and the key indexes are all superior to the relevant standards.
Example 12
The same procedure as in example 10 was repeated, except that the amount of the curing agent added was 0.3kg as compared with example 10.
In the embodiment, the compressive strength of the prepared baking-free antique blue brick based on the construction waste tailings is 16.87MPa after 28 days, the strength standard of the MU15 wall brick is completely met, the water absorption rate is 5.1%, the freeze-thaw loss strength rate for 25 times is only 7.9%, and the key indexes are all superior to the relevant standards.
Example 13
The same procedure as in example 10 was repeated, except that the amount of the curing agent added was 0.4kg as compared with example 10.
In the embodiment, the compressive strength of the prepared unfired antique blue brick based on the building waste tailings is 18.08MPa after 28 days, the strength standard of the MU15 wall brick is completely met, the water absorption rate is 5.0%, the freeze-thaw loss strength rate for 25 times is only 7.5%, and the key indexes are all superior to the relevant standards.
In this example, the testing performance of the unfired antique blue bricks based on the construction waste tailings obtained in examples 10 to 12 and this example is counted, and the specific results are shown in table 4.
TABLE 4 Effect of different curing agent admixtures on product Properties
In table 4, the blending amount of each raw material is calculated according to the mass percentage, and it can be seen from the data in table 4 that the use amount of the curing agent prepared by the present invention is adjusted and tested on the premise of the same blending amount of the construction waste tailings and the cement, the use amount is generally 0.02% -0.03%, the standard brick requirement of the existing national wall brick can be met, when the use amount is 0.025%, the cost performance is the best, and when the use amount is 0.03%, the performance is the best.
Example 14
A baking-free antique blue brick based on construction waste tailings is prepared by the following specific preparation method (shown in figure 1):
1) preparation of curing agent (curing admixture): preparation of curing agent (curing admixture): 435kg of deionized water is firstly injected into a reaction kettle with a heating system, the reaction kettle is heated to 70 ℃, 15kg of sodium alginate is added, the stirring is carried out for 20min, the reaction kettle is heated to 80 ℃ at the same time, and the temperature is kept for 1 h; cooling to 40 ℃; adding 250kg of sulfonated phenolic resin, stirring for 1h until the sulfonated phenolic resin is completely dissolved, and naturally cooling to 20 ℃; adding 300kg of liquid silicon dioxide (the liquid silicon dioxide is required to be commercially available nanoscale liquid alkaline silicon dioxide, the average particle size is 11.6nm, and the solid content is 50 wt%) and fully stirring; measuring the density to be about 1.28g/mL, and filtering to obtain the curing agent with the formula of the embodiment for later use;
2) stirring the mixture: weighing 910kg of construction waste tailings, 80kg of 42.5 Portland cement and 10kg of black iron oxide colorant, and uniformly mixing for 3min to obtain dry mixture; simultaneously, 0.3kg of the curing agent is diluted with 10 wt% of water of the dry mixture, namely 100kg of water is diluted to obtain a diluted solution for later use; adding the diluent into the mixed dry mixture by using spray type water adding equipment, and fully mixing for 5min to obtain a mixture for later use;
3) and (3) pressing and forming: conveying the mixed mixture into 1200-ton bidirectional static pressure equipment by using a conveying device and a weighing and distributing system, pressing the mixed mixture into a standard brick with the size of 240 multiplied by 115 multiplied by 53mm, pressing the standard brick into a single block with the forming pressure of 15MPa, and demoulding and forming the brick for 20 seconds;
4) and (5) maintenance: and (3) curing for 15 days under the moisture-preserving condition to obtain the baking-free antique blue brick based on the construction waste tailings, namely the baking-free antique blue brick serving as the baking-free antique blue brick can leave a factory. The 28-day compressive strength is detected to be 15.04Mpa, the strength standard of the MU15 (namely the compressive strength of the MU15 is indicated to be 15MP) wall brick is met, the water absorption rate is 7.8 percent, and the freeze-thaw loss rate for 25 times is 9.1 percent.
Example 15
The same procedure as in example 14 was repeated, except that the amount of the construction waste tailings was 900kg and the amount of the 42.5 portland cement was 90kg, as compared with example 14.
In the embodiment, the compressive strength of the prepared baking-free antique blue brick based on the construction waste tailings is 16.87Mpa in 28 days, the strength standard of the MU15 wall brick is completely met, the water absorption rate is 5.1%, the freeze-thaw loss rate for 25 times is 7.9%, and the key indexes are all superior to the relevant standards.
Example 16
The same procedure as in example 14 was repeated, except that 890kg of construction waste tailings was added and 100kg of 42.5 kg of portland cement was added, as compared with example 14.
In the embodiment, the compressive strength of the prepared baking-free antique blue brick based on the construction waste tailings is 18.11MPa in 28 days, the strength standard of the MU15 wall brick is completely met, the water absorption rate is 4.8%, the freeze-thaw loss rate for 25 times is 6.2%, and the key indexes are all superior to the relevant standards.
In order to determine the performance and the optimum mixing ratio of the invention and to test the benefits of the invention, the cement dosage of different mixing ratios is compared and tested on the premise of quantitative curing agent, namely the burning-free archaized blue bricks based on the construction waste tailings in the examples 14, 15 and 16 are compared and tested, and the specific results are shown in table 5.
TABLE 5 Effect of different Cement admixtures on product Properties
In table 5, the mixing amount of each raw material is calculated according to the mass percentage, and it can be seen from the data in table 5 that the mixing amount of the cement is adjusted and tested on the premise of the same mixing amount of the construction waste tailings and the curing agent, the using amount is generally 8-10%, the standard brick requirement of the existing national wall brick can be met, and the optimal cost performance can be seen when the using amount is 9%.
Example 17
In order to fully test the advantages of the invention in performance, according to GB/T2542-2012 'wall brick test method', a large number of comparative tests on the traditional sintered black bricks, sand non-sintered cement bricks, common construction waste regenerated bricks and the non-sintered antique black bricks obtained in the embodiment 16 of the invention are carried out, and specific test results are shown in Table 6.
Table 6 comparison table of main technical indexes of building blocks of the present invention and other processes
The data according to table 6 show that: the invention uses least cement, has the highest compressive strength, and has the carbonization coefficient and the softening coefficient which are comparable with those of the sintered blue brick, and the main performance indexes of the invention are superior to those of the non-fired cement brick and the general construction waste regeneration brick.
Example 18
Compared with the embodiment 16, the curing agent is the same as the embodiment 16 except that the curing agent is prepared by weighing 40kg of deionized water according to a proportion, heating the deionized water to 65 ℃, then adding 1kg of sodium alginate, heating the sodium alginate to 78 ℃, uniformly mixing, keeping the temperature for 0.5h, cooling the mixture to 35 ℃, then adding 20kg of sulfonated phenolic resin, uniformly mixing until the sulfonated phenolic resin is completely dissolved, cooling the mixture to 16 ℃, adding 25kg of liquid silicon dioxide, uniformly stirring and mixing, and filtering the mixture.
Example 19
Compared with the embodiment 16, the curing agent is the same as the embodiment 16 except that 50kg of deionized water is weighed according to the proportion, the deionized water is heated to 75 ℃, then 2kg of sodium alginate is added and heated to 82 ℃ for uniform mixing, the temperature is kept for 2.5h, then the temperature is reduced to 45 ℃, then 25kg of sulfonated phenolic resin is added and uniformly mixed until the sodium alginate is completely dissolved, the temperature is cooled to 26 ℃, 30kg of liquid silicon dioxide is added for uniform mixing and stirring, and the filtration is carried out, so that the curing agent is obtained.
Example 20
Compared with the example 16, the curing agent is the same as the example 16 except that the liquid silicon dioxide is required to be commercially available nanoscale liquid alkaline silicon dioxide, the average particle size is 10nm, the solid content is 40 wt%, the curing agent is prepared by weighing 45kg of deionized water according to the proportion, heating to 70 ℃, adding 1.5kg of sodium alginate, heating to 80 ℃, uniformly mixing, keeping the temperature for 1.5h, cooling to 40 ℃, adding 22.5kg of sulfonated phenolic resin, uniformly mixing until the sulfonated phenolic resin is completely dissolved, cooling to 21 ℃, adding 27.5kg of liquid silicon dioxide, fully stirring and uniformly mixing, and filtering.
Example 21
The procedure is as in example 20 except that the liquid silica is required to be a commercially available nanoscale liquid basic silica having an average particle diameter of 12nm and a solid content of 60% by weight, as compared with example 20.
Example 22
The same as example 16 except that the construction waste was 800kg of the tailing, 0.2kg of the curing agent, 80kg of the cement, 8kg of the coloring agent and 80kg of the water as compared with example 16.
Example 23
The same as example 16 except that the construction waste was 950kg of the tailing, 0.3kg of the curing agent, 100kg of the cement, 10kg of the coloring agent and 120kg of the water as compared with example 16.
Example 24
The same as example 16 except that 925kg of the construction waste tailing, 0.25kg of the curing agent, 90kg of the cement, 9kg of the coloring agent and 100kg of the water were used, was used as compared with example 16.
The invention can completely use the construction waste tailings in the construction blocks, thoroughly realize zero-pollution, harmless and complete resource comprehensive utilization, and the product can be reused in local development and construction, thereby saving the material cost and the transportation cost, fundamentally solving the contradiction between economic development and environmental protection, and having good environmental benefit and social benefit.
On the other hand, along with the rapid heating of the civil and tourist market, the establishment and the transformation of small-town construction, the demand gap of the antique building to the green brick market is larger and larger, and the green brick is influenced by traditional culture, is used as an ideal culture decorative material for decorating walls and pavements of buildings, and becomes one of products recommended by designers in the utmost in recent years. The traditional process for firing the black bricks produces a large amount of carbon emission, seriously influences the ecological environment, especially reduces the current environmental protection policy day by day, and most places do not allow the clay bricks to be fired, so that the black brick market in all places is valuable and marketable, and even many antique buildings and travel projects do not cause shutdown because of the black brick supply. Therefore, the method for manufacturing the antique blue bricks by using the construction waste tailings is a technical direction which is in line with the market.
The baking-free antique blue brick provided by the embodiment of the invention takes the construction waste tailings, the curing agent, the cement, the colorant, the water and the like as raw materials, the prepared baking-free antique blue brick has high strength and excellent water resistance and ageing resistance, the antique blue brick is produced by adopting a chemical modification mode to serve as a building material, and meanwhile, the density of the building material is greatly improved by adopting a high-density hydraulic forming method, so that the harmless and efficient utilization of the construction waste tailings can be promoted. Compared with a green brick product obtained by sintering, the prepared building material has the advantages of low production cost, high building block strength, good physical waterproof effect, long service life and the like, solves the current situation that a large amount of carbon is discharged when most of the existing green brick building blocks are manufactured by adopting a sintering method, and simultaneously solves the urban development problems that the building waste tailings cannot be utilized and a large amount of cultivated land is needed for landfill.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (5)
1. The baking-free antique blue brick based on the construction waste tailings is characterized by comprising the following raw materials: 80-95 parts of construction waste tailings, 0.02-0.03 part of curing agent, 8-10 parts of cement, 0.8-1 part of colorant and 8-12 parts of water; the baking-free antique blue brick based on the construction waste tailings is manufactured by adopting a hydraulic forming method; the curing agent is prepared from the following raw materials in parts by weight: 40-50 parts of inorganic solvent, 20-25 parts of phenolic resin, 1-1.5 parts of sodium alginate and 25-30 parts of liquid silicon dioxide, wherein the phenolic resin is sulfonated phenolic resin, and the liquid silicon dioxide is colloidal sol of inorganic high-molecular poly-metasilicic acid taking water as a dispersion medium, and the preparation method of the baking-free antique blue brick based on the construction waste tailings comprises the following steps:
weighing inorganic solvent, sodium alginate, phenolic resin and liquid silicon dioxide according to the proportion, heating, stirring and mixing uniformly to obtain a curing agent;
weighing water according to a proportion, adding the water into the curing agent, and uniformly mixing to obtain a diluent, wherein the preparation method of the curing agent specifically comprises the following steps: weighing an inorganic solvent according to a proportion, heating to 65-75 ℃, then adding sodium alginate, heating to 78-82 ℃, uniformly mixing, keeping the temperature for 0.5-2.5h, cooling to 35-45 ℃, then adding phenolic resin, uniformly mixing, cooling to 16-26 ℃, adding liquid silicon dioxide, uniformly mixing, and filtering to obtain the curing agent;
weighing the construction waste tailings, the cement and the colorant according to the proportion, uniformly mixing, and then uniformly mixing with the diluent to obtain a mixture;
and carrying out hydraulic forming and curing on the mixture to obtain the baking-free antique black brick based on the construction waste tailings.
2. The baking-free antique blue brick based on the construction waste tailings of claim 1, wherein the baking-free antique blue brick based on the construction waste tailings has a 28-day compressive strength of more than 10MPa, a water absorption of less than 10%, a softening coefficient of not less than 0.8, and a strength loss rate of not more than 10% after 25 times of freeze-thaw cycles.
3. The baking-free antique blue brick based on the construction waste tailings of claim 1, wherein the construction waste tailings are powder generated after crushing a building and/or tailings left after selecting usable aggregates from the powder generated after crushing the building, the construction waste tailings have a soil content of less than 70wt%, a particle size of 0.1-3mm, and a natural water content of less than 15 wt%.
4. The baking-free antique blue brick based on the construction waste tailings of claim 1, wherein the average particle size of the liquid silica is 10-12nm, and the solid content is 40-60 wt%.
5. Use of the unfired antique blue brick based on the construction waste tailings of claim 1, 2, 3 or 4 in construction.
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