CN111087218A - Preparation process of precast concrete - Google Patents
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- CN111087218A CN111087218A CN201911387544.7A CN201911387544A CN111087218A CN 111087218 A CN111087218 A CN 111087218A CN 201911387544 A CN201911387544 A CN 201911387544A CN 111087218 A CN111087218 A CN 111087218A
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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
- C04B28/06—Aluminous 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
- C04B38/106—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam by adding preformed foams
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/10—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers containing more than one epoxy radical per molecule
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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
- C04B2111/40—Porous or lightweight materials
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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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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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- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
The invention discloses a preparation process of precast concrete, which belongs to the field of building materials and comprises the following steps: step 1, preparing modified epoxy resin; step 2, preparing concrete aggregate; step 3, preparing pre-foaming foam; step 4, preparing a mixed solution; and 5, mixing and foaming to obtain the foam concrete. According to the invention, the epoxy resin is chemically modified, and the nano aggregate is subjected to high-temperature solid-phase modification, so that the framework strength and density of the foam concrete are enhanced, and the foaming mechanism is controlled, so that air holes in the foam concrete are smaller and more uniformly distributed, the performance of the foam concrete is obviously improved, and the foam concrete is very suitable for being used as a building member with certain requirements on weighing.
Description
Technical Field
The invention discloses a preparation process of prefabricated foam concrete, belongs to the technical field of concrete materials, and particularly relates to a preparation process of foam concrete.
Background
The foam concrete is a light concrete material obtained by uniformly mixing foam and cement slurry. The foam concrete is also called as foaming cement, lightweight concrete and the like, and is a novel building energy-saving material which is waste-utilizing, environment-friendly, energy-saving, low in cost and non-combustible. At present, the foam in the foam concrete is introduced into the concrete slurry by introducing air or nitrogen, carbon dioxide, oxygen and other gases into the concrete slurry according to application requirements in a chemical or physical mode, and then the concrete slurry is reasonably maintained and formed to form the concrete material containing a large number of fine closed air holes and has considerable strength. At present, the foaming mechanism adopted is to prepare the foaming agent aqueous solution into foam by a mechanical method, and the specific operation is as follows: mechanically preparing foam from the aqueous solution of foaming agent, adding it to the slurry containing siliceous material, calcareous material, water and additives, stirring, pouring for shaping, and curing.
As a novel energy-saving environment-friendly building material, a large amount of research and development are carried out on the building material by domestic and foreign scholars, so that the building material is widely applied to wall materials. The advantages are that: the product has the advantages of low density, light weight, heat preservation, sound insulation, shock resistance and the like; however, it has certain defects, such as low strength, cracking, water absorption, etc., so that further research on foaming agents, mixing ratio, process flow, equipment, etc. is needed to further expand the application field.
The patent document CN 105777190A discloses a 'foam concrete', which is prepared by preparing an intermediate slurry from 50 to 60 parts by weight of water, 120 to 150 parts by weight of cement, 0.8 to 1.5 parts by weight of anti-crack fibers, 0.9 to 1.2 parts by weight of anti-crack agents, 6 to 10 parts by weight of fly ash and 0.6 to 1.2 parts by weight of redispersible latex powder, wherein the intermediate slurry is uniformly mixed with 0.4 to 0.8 volume of polyphenyl particles and 0.8 to 1.2 volume of foaming bubbles.
It can be seen that the above-mentioned foam concrete uses various materials including fiber, latex powder and crack resistance agent to increase the strength of the concrete, but it does not have a significant effect on the increase of mechanical properties due to the manner of material addition and the property limitations of the material itself.
Disclosure of Invention
The invention aims to overcome the defects of poor strength and high water absorption rate of the existing foam concrete, and mainly improves closed bubbles of the foam concrete and enhances the strength of the foam concrete by modifying epoxy resin and aggregate.
The technical scheme is as follows:
a preparation process of prefabricated foam concrete comprises the following steps:
step 1, preparation of modified epoxy resin: according to parts by weight, 3-10 parts of bisphenol A, 0.5-1.5 parts of polyetherimide, 0.8-1.2 parts of polydimethylsiloxane, 0.3-0.5 part of butyl acrylate, 0.4-0.9 part of methyl methacrylate, 0.2-0.6 part of trimethylolpropane and 15-30 parts of aqueous solution of alkali metal hydroxide are uniformly mixed, heated and reacted at 65-72 ℃, and after the reaction is finished, modified epoxy resin is obtained;
step 2, preparing concrete aggregate; putting 5-10 parts by weight of barium slag, 3-8 parts by weight of coal gangue, 5-10 parts by weight of steel slag, 2-5 parts by weight of desulfurized gypsum, 1-3 parts by weight of aluminum silicate, 1-3 parts by weight of zircon sand and 2-5 parts by weight of kaolin into a mold, putting the mold into a high-temperature furnace for high-temperature and high-pressure calcination for 2-5 h, cooling and crushing the mold, and putting the mold into a grinder for grinding the mold to an average particle size of 5-25 mu m to obtain concrete aggregate;
step 3, preparing pre-foaming foam: putting 0.3-0.8 part of foaming agent into a foaming machine by weight part, diluting by 30-50 times, and foaming;
step 4, preparing a mixed solution: putting 0.2-0.5 part of water reducing agent and 0.2-0.6 part of exciting agent into 35-55 parts of water by weight, and uniformly stirring;
step 5, mixing and foaming: and (3) putting 90-120 parts of aluminate cement clinker, modified epoxy resin, concrete aggregate, pre-foaming foam and the mixed solution into a pulping foam mixing machine, and mixing and foaming to obtain the foam concrete.
Preferably, in the step 1, the alkali metal hydroxide is sodium hydroxide, and the concentration of the sodium hydroxide is 1.5-3.2 mol/L.
Preferably, in the step 2, the temperature of the high-temperature high-pressure calcination is 1110-1280 ℃.
Preferably, in the step 2, the pressure of the high-temperature high-pressure calcination is 150-250 MPa.
Preferably, in the step 3, the foaming agent is a tea saponin foaming agent, a saponin type foaming agent or a rosin soap foaming agent.
Preferably, in the step 4, the water reducing agent is an HSB aliphatic high-efficiency water reducing agent.
Preferably, in the step 4, the activator is an FJ type activator.
Advantageous effects
According to the invention, the epoxy resin is chemically modified, and the nano aggregate is subjected to high-temperature solid-phase modification, so that the framework strength and density of the foam concrete are enhanced, and the foaming mechanism is controlled, so that air holes in the foam concrete are smaller and more uniformly distributed, the performance of the foam concrete is obviously improved, and the foam concrete is very suitable for being used as a building member with certain requirements on weighing.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The HSB aliphatic superplasticizer adopted by the invention is PC-1030P in type, and is produced by Australian chemical industry.
Example 1
A preparation process of prefabricated foam concrete comprises the following steps:
step 1, preparation of modified epoxy resin: uniformly mixing 3 parts of bisphenol A, 0.5 part of polyetherimide, 0.8 part of polydimethylsiloxane, 0.3 part of butyl acrylate, 0.4 part of methyl methacrylate, 0.2 part of trimethylolpropane and 15 parts of an aqueous solution of alkali metal hydroxide with the mass concentration of 1.5mol/L, heating at 65 ℃ for reaction, and obtaining modified epoxy resin after the reaction is finished;
step 2, preparation of concrete aggregate: putting 5 parts of barium slag, 3 parts of coal gangue, 5 parts of steel slag, 2 parts of desulfurized gypsum, 1 part of aluminum silicate, 1 part of zircon sand and 2 parts of kaolin into a mold, putting the mold into a high-temperature furnace for high-temperature and high-pressure calcination, cooling and crushing the mold, putting the mold into a grinder for grinding until the average particle size is 5 mu m, and obtaining concrete aggregate, wherein the temperature of the high-temperature and high-pressure calcination is 1110 ℃, the pressure of the high-temperature and high-pressure calcination is 150MPa, and the calcination time is 2 h;
step 3, preparing pre-foaming foam: putting 0.3 part of tea saponin foaming agent into a foaming machine according to the parts by weight, diluting by 30 times and foaming;
step 4, preparing a mixed solution: according to the parts by weight, 0.2 part of HSB aliphatic superplasticizer and 0.2 part of FJ type activator are put into 35 parts of water and stirred uniformly.
Step 5, mixing and foaming: and (3) putting 90 parts of aluminate cement clinker, modified epoxy resin, concrete aggregate, pre-foaming foam and the mixed solution into a pulping foam mixing machine, and mixing and foaming to obtain the foam concrete.
Example 2
A preparation process of prefabricated foam concrete comprises the following steps:
step 1, preparation of modified epoxy resin: uniformly mixing 10 parts of bisphenol A, 1.5 parts of polyetherimide, 1.2 parts of polydimethylsiloxane, 0.5 part of butyl acrylate, 0.9 part of methyl methacrylate, 0.6 part of trimethylolpropane and 30 parts of an alkali metal hydroxide aqueous solution with the mass concentration of 3.2mol/L, heating at 72 ℃ for reaction, and obtaining modified epoxy resin after the reaction is finished;
step 2, preparation of concrete aggregate: putting 10 parts of barium slag, 8 parts of coal gangue, 10 parts of steel slag, 5 parts of desulfurized gypsum, 3 parts of aluminum silicate, 3 parts of zircon sand and 5 parts of kaolin into a mold, putting the mold into a high-temperature furnace for high-temperature and high-pressure calcination, cooling and crushing the mold, putting the mold into a grinder for grinding until the average particle size is 25 mu m, and obtaining concrete aggregate, wherein the temperature of the high-temperature and high-pressure calcination is 1280 ℃, the pressure of the high-temperature and high-pressure calcination is 250MPa, and the calcination time is 5 hours;
step 3, preparing pre-foaming foam: putting 0.8 part of saponin type foaming agent into a foaming machine according to the parts by weight, diluting by 50 times and foaming;
step 4, preparing a mixed solution: according to the parts by weight, 0.5 part of HSB aliphatic superplasticizer and 0.6 part of FJ type activator are put into 55 parts of water and stirred uniformly.
Step 5, mixing and foaming: and (3) putting 120 parts of aluminate cement clinker, modified epoxy resin, concrete aggregate, pre-foaming foam and the mixed solution into a pulping foam mixing machine, and mixing and foaming to obtain the foam concrete.
Example 3
A preparation process of prefabricated foam concrete comprises the following steps:
step 1, preparation of modified epoxy resin: uniformly mixing 4 parts of bisphenol A, 0.7 part of polyetherimide, 0.9 part of polydimethylsiloxane, 0.4 part of butyl acrylate, 0.5 part of methyl methacrylate, 0.3 part of trimethylolpropane and 18 parts of aqueous solution of alkali metal hydroxide with the mass concentration of 2.0mol/L, heating at 67 ℃ for reaction, and obtaining modified epoxy resin after the reaction is finished;
step 2, preparation of concrete aggregate: putting 6 parts of barium slag, 4 parts of coal gangue, 6 parts of steel slag, 3 parts of desulfurized gypsum, 2 parts of aluminum silicate, 2 parts of zircon sand and 3 parts of kaolin into a mold, putting the mold into a high-temperature furnace for high-temperature and high-pressure calcination, cooling and crushing the mold, putting the mold into a grinder for grinding until the average particle size is 10 mu m, and obtaining concrete aggregate, wherein the temperature of the high-temperature and high-pressure calcination is 1150 ℃, the pressure of the high-temperature and high-pressure calcination is 180MPa, and the calcination time is 3 hours;
step 3, preparing pre-foaming foam: putting 0.4 part of rosin soap foaming agent into a foaming machine by weight part, diluting by 35 times and foaming;
step 4, preparing a mixed solution: according to the parts by weight, 0.3 part of HSB aliphatic superplasticizer and 0.3 part of FJ type activator are put into 40 parts of water and are stirred uniformly.
Step 5, mixing and foaming: and (3) putting 100 parts of aluminate cement clinker, modified epoxy resin, concrete aggregate, pre-foaming foam and the mixed solution into a pulping foam mixing machine, and mixing and foaming to obtain the foam concrete.
Example 4
A preparation process of prefabricated foam concrete comprises the following steps:
step 1, preparation of modified epoxy resin: uniformly mixing 9 parts of bisphenol A, 1.3 parts of polyetherimide, 1.1 parts of polydimethylsiloxane, 0.4 part of butyl acrylate, 0.8 part of methyl methacrylate, 0.5 part of trimethylolpropane and 27 parts of an alkali metal hydroxide aqueous solution with the mass concentration of 2.8mol/L, heating at 70 ℃ for reaction, and obtaining modified epoxy resin after the reaction is finished;
step 2, preparation of concrete aggregate: putting 9 parts of barium slag, 7 parts of coal gangue, 9 parts of steel slag, 4 parts of desulfurized gypsum, 2 parts of aluminum silicate, 2 parts of zircon sand and 4 parts of kaolin into a mold, putting the mold into a high-temperature furnace for high-temperature and high-pressure calcination, cooling and crushing the mold, putting the mold into a grinder for grinding until the average particle size is 20 mu m, and obtaining concrete aggregate, wherein the temperature of the high-temperature and high-pressure calcination is 1220 ℃, the pressure of the high-temperature and high-pressure calcination is 220MPa, and the calcination time is 4 hours;
step 3, preparing pre-foaming foam: putting 0.7 part of saponin type foaming agent into a foaming machine according to the parts by weight, diluting by 45 times and foaming;
step 4, preparing a mixed solution: according to the parts by weight, 0.4 part of HSB aliphatic superplasticizer and 0.5 part of FJ type activator are put into 50 parts of water and stirred uniformly.
Step 5, mixing and foaming: and (3) putting 110 parts of aluminate cement clinker, modified epoxy resin, concrete aggregate, pre-foaming foam and the mixed solution into a pulping foam mixing machine, and mixing and foaming to obtain the foam concrete.
Example 5
A preparation process of prefabricated foam concrete comprises the following steps:
step 1, preparation of modified epoxy resin: uniformly mixing 5 parts of bisphenol A, 1.0 part of polyetherimide, 1.0 part of polydimethylsiloxane, 0.4 part of butyl acrylate, 0.7 part of methyl methacrylate, 0.4 part of trimethylolpropane and 27 parts of an alkali metal hydroxide aqueous solution with the mass concentration of 2.5mol/L, heating at 69 ℃ for reaction, and obtaining modified epoxy resin after the reaction is finished;
step 2, preparation of concrete aggregate: putting 8 parts of barium slag, 6 parts of coal gangue, 8 parts of steel slag, 3 parts of desulfurized gypsum, 2 parts of aluminum silicate, 2 parts of zircon sand and 3 parts of kaolin into a mold, putting the mold into a high-temperature furnace for high-temperature and high-pressure calcination, cooling and crushing the mold, putting the mold into a grinder for grinding until the average particle size is 15 mu m, and obtaining concrete aggregate, wherein the temperature of the high-temperature and high-pressure calcination is 1190 ℃, the pressure of the high-temperature and high-pressure calcination is 200MPa, and the calcination time is 3 hours;
step 3, preparing pre-foaming foam: putting 0.6 part of tea saponin foaming agent into a foaming machine according to the parts by weight, diluting by 40 times and foaming;
step 4, preparing a mixed solution: according to the parts by weight, 0.3 part of HSB aliphatic superplasticizer and 0.4 part of FJ type activator are put into 45 parts of water and stirred uniformly.
Step 5, mixing and foaming: and (3) putting 105 parts of aluminate cement clinker, modified epoxy resin, concrete aggregate, pre-foaming foam and the mixed solution into a pulping foam mixing machine, and mixing and foaming to obtain the foam concrete.
Comparative example 1
The difference from example 5 is that: the epoxy resin was not modified and E44 epoxy resin was added directly.
Step 1, preparation of concrete aggregate: putting 8 parts of barium slag, 6 parts of coal gangue, 8 parts of steel slag, 3 parts of desulfurized gypsum, 2 parts of aluminum silicate, 2 parts of zircon sand and 3 parts of kaolin into a mold, putting the mold into a high-temperature furnace for high-temperature and high-pressure calcination, cooling and crushing the mold, putting the mold into a grinder for grinding until the average particle size is 15 mu m, and obtaining concrete aggregate, wherein the temperature of the high-temperature and high-pressure calcination is 1190 ℃, the pressure of the high-temperature and high-pressure calcination is 200MPa, and the calcination time is 3 hours;
step 2, preparing pre-foaming foam: putting 0.6 part of tea saponin foaming agent into a foaming machine according to the parts by weight, diluting by 40 times and foaming;
step 3, preparing a mixed solution: according to the parts by weight, 0.3 part of HSB aliphatic superplasticizer and 0.4 part of FJ type activator are put into 45 parts of water and stirred uniformly.
Step 4, mixing and foaming: and (3) putting 105 parts of aluminate cement clinker, 5 parts of E44 epoxy resin, concrete aggregate, pre-foaming foam and the mixed solution into a pulping foam mixer, and mixing and foaming to obtain the foam concrete.
Comparative example 2
The difference from example 5 is that: the concrete aggregate was not treated.
Step 1, preparation of modified epoxy resin: uniformly mixing 5 parts of bisphenol A, 1.0 part of polyetherimide, 1.0 part of polydimethylsiloxane, 0.4 part of butyl acrylate, 0.7 part of methyl methacrylate, 0.4 part of trimethylolpropane and 27 parts of an alkali metal hydroxide aqueous solution with the mass concentration of 2.5mol/L, heating at 69 ℃ for reaction, and obtaining modified epoxy resin after the reaction is finished;
step 2, preparing pre-foaming foam: putting 0.6 part of tea saponin foaming agent into a foaming machine according to the parts by weight, diluting by 40 times and foaming;
step 3, preparing a mixed solution: according to the parts by weight, 0.3 part of HSB aliphatic superplasticizer and 0.4 part of FJ type activator are put into 45 parts of water and stirred uniformly.
Step 4, mixing and foaming: and (2) putting 105 parts of aluminate cement clinker, modified epoxy resin, 8 parts of barium slag, 6 parts of coal gangue, 8 parts of steel slag, 3 parts of desulfurized gypsum, 2 parts of aluminum silicate, 2 parts of zircon sand, 3 parts of kaolin, pre-foaming foam and mixed liquid into a pulping and foaming machine, and mixing and foaming to obtain the foam concrete.
The foam concrete prepared in the above examples and comparative examples was subjected to a performance test in accordance with building industry standard JG/T266-2011, and the results are shown in table 1:
table 1 example and comparative example foam concrete physical property test
As can be seen from the above table, the thermal conductivity, water absorption and strength grade of the examples 1-5 are superior to those of the comparative examples 1-2, and the density of the comparative example 1 is slightly higher because the epoxy resin is not modified; the water absorption rate is related to closed pores in the foam concrete, and after the epoxy resin and the aggregate are subjected to nano modification, the pores formed in the foam concrete are smaller and are distributed more uniformly, so that the sealing performance is better, and therefore, the heat conductivity coefficient and the water absorption rate index of the examples 1-5 are better than those of the comparative examples 1-2; the strength grades are also related to concrete foaming and a concrete framework, in examples 1-5, the concrete framework is improved, the modified epoxy resin, the nano aggregate and the cement clinker are used as the framework, the added air bubbles are smaller and more uniform, and the mechanical strength is obviously improved, so the strength grades of examples 1-5 are superior to those of comparative examples 1-2.
Claims (7)
1. A preparation process of prefabricated foam concrete is characterized by comprising the following steps:
step 1, preparation of modified epoxy resin: according to parts by weight, 3-10 parts of bisphenol A, 0.5-1.5 parts of polyetherimide, 0.8-1.2 parts of polydimethylsiloxane, 0.3-0.5 part of butyl acrylate, 0.4-0.9 part of methyl methacrylate, 0.2-0.6 part of trimethylolpropane and 15-30 parts of aqueous solution of alkali metal hydroxide are uniformly mixed, heated and reacted at 65-72 ℃, and after the reaction is finished, modified epoxy resin is obtained;
step 2, preparing concrete aggregate; putting 5-10 parts by weight of barium slag, 3-8 parts by weight of coal gangue, 5-10 parts by weight of steel slag, 2-5 parts by weight of desulfurized gypsum, 1-3 parts by weight of aluminum silicate, 1-3 parts by weight of zircon sand and 2-5 parts by weight of kaolin into a mold, putting the mold into a high-temperature furnace for high-temperature and high-pressure calcination for 2-5 h, cooling and crushing the mold, and putting the mold into a grinder for grinding the mold to an average particle size of 5-25 mu m to obtain concrete aggregate;
step 3, preparing pre-foaming foam: putting 0.3-0.8 part of foaming agent into a foaming machine by weight part, diluting by 30-50 times, and foaming;
step 4, preparing a mixed solution: putting 0.2-0.5 part of water reducing agent and 0.2-0.6 part of exciting agent into 35-55 parts of water by weight, and uniformly stirring;
step 5, mixing and foaming: and (3) putting 90-120 parts of aluminate cement clinker, modified epoxy resin, concrete aggregate, pre-foaming foam and the mixed solution into a pulping foam mixing machine, and mixing and foaming to obtain the foam concrete.
2. The process for preparing a prefabricated foam concrete according to claim 1, characterized in that: in the step 1, the alkali metal hydroxide is sodium hydroxide, and the mass concentration of the sodium hydroxide is 1.5-3.2 mol/L.
3. The process for preparing a prefabricated foam concrete according to claim 1, characterized in that: in the step 2, the temperature of the high-temperature high-pressure calcination is 1110-1280 ℃.
4. The process for preparing a prefabricated foam concrete according to claim 1, characterized in that: and in the step 2, the pressure of high-temperature and high-pressure calcination is 150-250 MPa.
5. The process for preparing a prefabricated foam concrete according to claim 1, characterized in that: in the step 3, the foaming agent is a tea saponin foaming agent, a saponin type foaming agent or a rosin soap foaming agent.
6. The process for preparing a prefabricated foam concrete according to claim 1, characterized in that: in the step 4, the water reducing agent is an HSB aliphatic high-efficiency water reducing agent.
7. The process for preparing a prefabricated foam concrete according to claim 1, characterized in that: in the step 4, the excitant is an FJ type excitant.
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| CN107140923A (en) * | 2017-07-12 | 2017-09-08 | 合肥梵腾环保科技有限公司 | A kind of environment-friendly type foam concrete block and preparation method thereof |
| CN108793903A (en) * | 2018-07-04 | 2018-11-13 | 黄明红 | A kind of preparation method of ultralight foamed concrete compound insulating material |
| CN109592990A (en) * | 2019-02-01 | 2019-04-09 | 马清浩 | A kind of gelling foamed concrete and preparation method thereof |
| CN110436859A (en) * | 2019-08-22 | 2019-11-12 | 东营镐润环保科技有限公司 | A kind of preparation process of modified foam concrete square pile |
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