CN111410482A - Preparation method of lightweight high-strength concrete - Google Patents
Preparation method of lightweight high-strength concrete Download PDFInfo
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- CN111410482A CN111410482A CN202010260238.3A CN202010260238A CN111410482A CN 111410482 A CN111410482 A CN 111410482A CN 202010260238 A CN202010260238 A CN 202010260238A CN 111410482 A CN111410482 A CN 111410482A
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
- C04B20/06—Expanding clay, perlite, vermiculite or like granular materials
- C04B20/068—Selection of ingredients added before or during the thermal treatment, e.g. expansion promoting agents or particle-coating 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
- 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
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- 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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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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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- 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
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- 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 technical field of building materials, in particular to a preparation method of light high-strength concrete. Mixing sepiolite with water, adding bacillus pasteurii, urea and magnesium nitrate, stirring and mixing, performing rotary evaporation concentration, drying and calcination to obtain modified sepiolite, mixing bamboo fiber with a sodium hydroxide solution, filtering to obtain No. 1 filter residue, then placing the No. 1 filter residue into sulfuric acid, performing mixing treatment, filtering and washing to obtain No. 2 filter residue, mixing the No. 2 filter residue with tetraethoxysilane, performing ball milling, then adding a dopamine solution, filtering, drying, gradually heating, performing high-temperature treatment to obtain modified fiber, and mixing sea sand, cement, modified fly ash, modified sepiolite, water, a silane coupling agent, a polyethyleneimine aqueous solution, peach glue and the modified fiber to obtain the light high-strength concrete. The lightweight high-strength concrete provided by the invention has good mechanical properties.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of light high-strength concrete.
Background
In recent years, with the drive of energy-saving policies of buildings, energy-saving technologies and energy-saving materials of buildings have been developed rapidly. Concrete is the most used building material in the building industry, and along with the development of economy and the progress of technology, the requirements of people on the building material are continuously improved, so that the concrete is required to have the requirements of high strength and durability, and the concrete also needs to meet the requirements of light weight and environmental protection. At present, the common concrete which is most used in industrial and civil buildings has heavy weight although the strength (generally 20-30MPa) can basically meet the requirement of building structures. However, at present, common concrete and aerated concrete are all brittle materials, and are easy to generate micro cracks or even completely damage due to shrinkage. The light concrete in the market has very low strength (generally less than 5MPa), cannot meet the requirements of building structures, and can only be used as non-bearing partition walls or heat-insulating materials. In addition, aerated concrete is very brittle and can easily break during transportation and construction. Therefore, it is urgently required to prepare concrete having light weight, high strength and crack prevention function.
Disclosure of Invention
The invention aims to provide a preparation method of light high-strength concrete, which aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the lightweight high-strength concrete comprises the following raw materials in parts by weight: 90-100 parts of sea sand, 30-40 parts of cement, 10-20 parts of modified fly ash, 10-20 parts of modified sepiolite, 20-30 parts of water, 3-5 parts of silane coupling agent, 10-20 parts of polyethyleneimine water solution, 10-20 parts of peach gum solution and 10-20 parts of modified fiber.
The cement is any one of portland cement, sulfate cement or aluminate cement.
The silane coupling agent is any one of a silane coupling agent KH-550, a silane coupling agent KH-560 or a silane coupling agent KH-570.
The modified fly ash comprises the following raw materials in parts by weight: 80-100 parts of fly ash and 30-50 parts of deionized water.
The modified sepiolite comprises the following raw materials in parts by weight: 10-20 parts of sepiolite, 80-100 parts of water, 2-3 parts of bacillus pasteurii, 3-5 parts of urea and 3-5 parts of magnesium sulfate.
The modified fiber comprises the following raw materials in parts by weight: 20-30 parts of bamboo fiber, 40-60 parts of a sodium hydroxide solution, 40-60 parts of sulfuric acid, 40-60 parts of a dopamine solution and 5-8 parts of ethyl orthosilicate.
The composite material comprises the following raw materials in parts by weight: 100 parts of sea sand, 40 parts of cement, 20 parts of modified fly ash, 20 parts of modified sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of polyethyleneimine water solution, 20 parts of peach gum solution and 20 parts of modified fiber.
A preparation method of light high-strength concrete comprises the following specific preparation steps:
(1) preparing modified fly ash;
(2) preparing modified sepiolite;
(3) preparing modified fiber;
(4) mixing materials;
(5) and (6) detecting.
The preparation steps of the lightweight high-strength concrete are as follows:
(1) placing fly ash and deionized water in a high-pressure reaction kettle, introducing liquid nitrogen into the reaction kettle at the speed of 6-8 m L/min until the pressure of the reaction kettle reaches 1-2 MPa, carrying out pressure maintaining ultrasonic treatment for 10-20 min, opening a discharge valve of the reaction kettle, spraying the materials into a collecting charging barrel, then transferring the materials in the charging barrel into an oven at the temperature of 80-90 ℃, drying for 3-5 h to obtain modified fly ash, introducing the liquid nitrogen into the reaction kettle containing the fly ash and the water, pressurizing the interior of the reaction kettle, and carrying out pressure relief after pressure maintaining, so that the materials in the reaction kettle are sprayed into the charging barrel, and the whole process has no external mechanical force except for introducing the liquid nitrogen for pressurization to crush the system, wherein the fly ash is a mixture of a composite structure consisting of crystals, glass bodies and a small amount of carbon substances, wherein the glass comprises smooth spherical bodies and small particles with irregular shapes and the like, and during the pressure relief process, the liquid nitrogen can enable part of the fly ash to enter the interior of small pores of the small pores and the small particle size of the fly ash particles to be effectively dispersed and the surface of the fly ash is a hollow particle size capable of further maintaining the small particle size of the hollow particle structure and the small particle size of the fly ash in the process, so as a hollow particle size of the hollow particle structure, and further increasing the particle size of the fly ash, and further increasing the particle size of the particle structure of;
(2) mixing sepiolite with water, adding bacillus pasteurianus, urea and magnesium nitrate, stirring and mixing, carrying out rotary evaporation concentration, drying and calcining to obtain modified sepiolite, adding bacillus pasteurianus, urea and magnesium nitrate into the modified sepiolite, forming magnesium carbonate hollow microspheres and ammonium nitrate in the preparation process of the modified sepiolite, filling the magnesium carbonate hollow microspheres and ammonium nitrate into pores of the sepiolite, wherein the hollow magnesium carbonate microspheres can be heated and decomposed in the use process in the calcining process to generate magnesium oxide, and a magnesium oxide raw material is provided for sintering, so that a product has better strength after being used, and secondly, the ammonium nitrate contained in the modified sepiolite can be violently decomposed in the preparation process of the product, generates larger heat in a system, provides energy required by internal sintering, and simultaneously makes all materials in the product fully contact, so that the strength of the sepiolite is further improved, meanwhile, a large amount of gaps are formed in the system due to violent decomposition of ammonium nitrate, and the strength of the product is further improved while the light weight of the product is ensured by using the modified sepiolite;
(3) mixing bamboo fiber and a sodium hydroxide solution, filtering to obtain No. 1 filter residue, then placing the No. 1 filter residue in sulfuric acid, mixing, filtering and washing to obtain No. 2 filter residue, mixing the No. 2 filter residue with tetraethoxysilane, ball-milling, then adding a dopamine solution, filtering, drying, gradually heating, and performing high-temperature treatment to obtain modified fiber;
(4) mixing sea sand, cement, modified fly ash, modified sepiolite, water, a silane coupling agent, a polyethyleneimine water solution, a peach gum solution and modified fibers to obtain the lightweight high-strength concrete;
(5) and (6) detecting.
The preparation steps of the lightweight high-strength concrete are as follows:
(1) taking 80-100 parts of fly ash and 30-50 parts of deionized water in sequence by weight, placing the fly ash and the deionized water in a high-pressure reaction kettle, introducing liquid nitrogen into the reaction kettle at the speed of 6-8 m L/min until the pressure of the reaction kettle reaches 1-2 MPa, carrying out pressure maintaining ultrasonic treatment for 10-20 min, opening a discharge valve of the reaction kettle, spraying the material into a collecting material cylinder, transferring the material in the material cylinder into an oven at the temperature of 80-90 ℃, and drying for 3-5 h to obtain modified fly ash;
(2) according to the weight parts, 10-20 parts of sepiolite, 80-100 parts of water, 2-3 parts of pasteurella, 3-5 parts of urea and 3-5 parts of magnesium sulfate are sequentially taken, the sepiolite is mixed with the water, the pasteurella is added, the urea and the magnesium nitrate are placed in a mixing kettle, the mixture is stirred and mixed for 40-60 min under the condition that the rotating speed is 400-600 r/min, mixed slurry is obtained, the mixed slurry is placed in a rotary evaporator, rotary evaporation and concentration are carried out for 40-60 min under the condition that the temperature is 60-70 ℃, concentrated solution is obtained, the concentrated solution is placed in a drying oven, drying is carried out to constant weight under the condition that the temperature is 105-110 ℃, dried slag is obtained, the dried slag is placed in a muffle furnace, calcined for 1-2 h under the condition that the temperature is 400-600 ℃, and then the temperature is reduced to the room temperature along with the furnace, and the modified sepiolite is obtained;
(3) taking 20-30 parts by weight of bamboo fiber, 40-60 parts by weight of a sodium hydroxide solution, 40-60 parts by weight of sulfuric acid, 40-60 parts by weight of a dopamine solution and 5-8 parts by weight of ethyl orthosilicate in sequence, placing the bamboo fiber and the sodium hydroxide solution with the mass fraction of 20-30% in a No. 1 beaker, stirring and mixing for 40-60 min under the condition that the rotating speed is 400-600 r/min, filtering to obtain No. 1 filter residue, then placing the No. 1 filter residue in the sulfuric acid with the mass fraction of 98%, mixing for 40-60 min, filtering, washing to obtain No. 2 filter residue, mixing and ball-milling the No. 2 filter residue and the ethyl orthosilicate, then adding the dopamine solution with the mass concentration of 2.6mg/m L, filtering, drying to obtain No. 3 filter residue, then placing the No. 3 filter residue in a sintering furnace, heating to 1400-1500 ℃ at the mass concentration of 8-10 ℃/min, carrying out high-temperature treatment for 2-3 h, and cooling to room temperature along with the furnace to obtain modified fiber;
(4) according to the weight parts, sequentially taking 90-100 parts of sea sand, 30-40 parts of cement, 10-20 parts of modified fly ash, 10-20 parts of modified sepiolite, 20-30 parts of water, 3-5 parts of silane coupling agent, 10-20 parts of polyethyleneimine aqueous solution, 10-20 parts of peach gum solution and 10-20 parts of modified fiber, placing the sea sand, the cement, the modified fly ash, the modified sepiolite, the water, the silane coupling agent, the polyethyleneimine aqueous solution with the mass fraction of 60-70%, the peach gum solution and the modified fiber in a stirrer, and stirring and mixing for 40-60 min under the condition that the rotating speed is 200-300 r/min to obtain the light high-strength concrete;
(5) and (6) detecting.
Compared with the prior art, the invention has the beneficial effects that:
(1) in the preparation process, liquid nitrogen is introduced into a reaction kettle containing fly ash and water, the interior of the reaction kettle is pressurized, pressure is maintained, and then the pressure is released, so that materials in the reaction kettle are sprayed into a charging barrel, the whole process is not subjected to crushing treatment on a system by any external mechanical action force except for introducing the liquid nitrogen for pressurization, and the fly ash is a substance existing in a particle form and is a mixture of a composite structure consisting of crystals, a glass body and a small amount of unburned carbon, wherein the glass comprises smooth spherical small particles with few irregular pores and the like, in the step (1) treatment process, part of the liquid nitrogen can enter the fly ash particles with few pores in the pressurization process, in the pressure release process, the liquid nitrogen is rapidly gasified, so that the surface part of a fly ash microsphere structure falls off, the particle size of the falling part is small, and the falling part is fine debris, the process can ensure that the surface pores of the fly ash particles are instantaneously increased, and the hollow porous fly ash microsphere structure is effectively reserved and can be dispersed in a system as a hollow porous framework, so that the technical effect of ensuring the light weight of the product is further improved;
(2) the invention adds the modified sepiolite which is added with the pasteurella, the urea and the magnesium nitrate, can form magnesium carbonate hollow microspheres and the ammonium nitrate in the preparation process of the modified sepiolite and is filled in the pores of the sepiolite, the hollow magnesium carbonate microspheres can be heated and decomposed in the use process in the calcination process to generate magnesium oxide which provides magnesium oxide raw materials for sintering, thereby leading the product to have better strength after being used, secondly, the ammonium nitrate contained in the modified sepiolite can be violently decomposed in the preparation process of the product and generate larger heat in the system, and the materials in the product are fully contacted while providing the energy required by internal sintering, thereby leading the sintering degree of the sepiolite to be improved, further improving the strength of the sepiolite, and simultaneously leading the violent decomposition of the ammonium nitrate to form a large number of pores in the system, the strength of the product is further improved while the light weight is ensured by using the modified sepiolite.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to more clearly illustrate the method of the present invention, the following examples are given, and the method of testing each index of the lightweight high-strength concrete produced in the following examples is as follows:
and testing the compressive strength of the test piece by using an SHT4305 electro-hydraulic servo universal testing machine.
Example 1
The lightweight high-strength concrete comprises the following raw materials in parts by weight: 100 parts of sea sand, 40 parts of cement, 20 parts of modified fly ash, 20 parts of modified sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of polyethyleneimine water solution, 20 parts of peach gum solution and 20 parts of modified fiber.
The cement is sulfate cement.
The silane coupling agent is a silane coupling agent KH-550.
The preparation steps of the lightweight high-strength concrete are as follows:
(1) taking 100 parts of fly ash and 50 parts of deionized water in sequence by weight, placing the fly ash and the deionized water in a high-pressure reaction kettle, introducing liquid nitrogen into the reaction kettle at the speed of 8m L/min until the pressure of the reaction kettle reaches 2MPa, carrying out pressure-maintaining ultrasonic treatment for 20min, opening a discharge valve of the reaction kettle to spray the materials into a collecting barrel, then transferring the materials in the collecting barrel into a 90 ℃ oven, and drying for 5h to obtain modified fly ash;
(2) according to the weight parts, 20 parts of sepiolite, 100 parts of water, 3 parts of pasteurella, 5 parts of urea and 5 parts of magnesium sulfate are taken in sequence, the sepiolite is mixed with the water, the pasteurella is added, the urea and the magnesium nitrate are placed in a mixing kettle, the stirring and the mixing are carried out for 60min under the condition that the rotating speed is 600r/min, mixed slurry is obtained, then the mixed slurry is placed in a rotary evaporator, the rotary evaporation and the concentration are carried out for 60min under the condition that the temperature is 70 ℃, concentrated solution is obtained, then the concentrated solution is placed in a drying oven, the drying is carried out to constant weight under the condition that the temperature is 110 ℃, dried slag is obtained, the dried slag is placed in a muffle furnace, the calcination is carried out for 2h under the condition that the temperature is 600 ℃, and then the temperature is reduced to the room temperature along with the oven, and the modified sepiolite is obtained;
(3) according to the weight parts, 30 parts of bamboo fiber, 60 parts of sodium hydroxide solution, 60 parts of sulfuric acid, 60 parts of dopamine solution and 8 parts of ethyl orthosilicate are sequentially taken, the bamboo fiber and the sodium hydroxide solution with the mass fraction of 30% are placed in a No. 1 beaker, are stirred and mixed for 40-60 min under the condition that the rotating speed is 600r/min, are filtered, so that No. 1 filter residue is obtained, then the No. 1 filter residue is placed in the sulfuric acid with the mass fraction of 98%, are mixed and treated for 40-60 min, are filtered and washed, so that No. 2 filter residue is obtained, the No. 2 filter residue and the ethyl orthosilicate are mixed and ball-milled, then the dopamine solution with the mass concentration of 2.6mg/m L is added, are filtered and dried, so that No. 3 filter residue is obtained, then the No. 3 filter residue is placed in a sintering furnace, is heated to 1500 ℃ at the temperature of 10 ℃/min, is treated at the high temperature for 3h, and;
(4) according to the weight parts, 100 parts of sea sand, 40 parts of cement, 20 parts of modified fly ash, 20 parts of modified sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of polyethyleneimine aqueous solution, 20 parts of peach gum solution and 20 parts of modified fiber are sequentially taken, and the sea sand, the cement, the modified fly ash, the modified sepiolite, the water, the silane coupling agent, the polyethyleneimine aqueous solution with the mass fraction of 70%, the peach gum solution and the modified fiber are placed in a stirrer and stirred and mixed for 60min under the condition that the rotating speed is 300r/min, so that the light high-strength concrete is obtained;
(5) and (6) detecting.
Example 2
The lightweight high-strength concrete comprises the following raw materials in parts by weight: 100 parts of sea sand, 40 parts of cement, 20 parts of fly ash, 20 parts of modified sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of polyethyleneimine water solution, 20 parts of peach gum solution and 20 parts of modified fiber.
The cement is sulfate cement.
The silane coupling agent is a silane coupling agent KH-550.
The preparation steps of the lightweight high-strength concrete are as follows:
(1) according to the weight parts, 20 parts of sepiolite, 100 parts of water, 3 parts of pasteurella, 5 parts of urea and 5 parts of magnesium sulfate are taken in sequence, the sepiolite is mixed with the water, the pasteurella is added, the urea and the magnesium nitrate are placed in a mixing kettle, the stirring and the mixing are carried out for 60min under the condition that the rotating speed is 600r/min, mixed slurry is obtained, then the mixed slurry is placed in a rotary evaporator, the rotary evaporation and the concentration are carried out for 60min under the condition that the temperature is 70 ℃, concentrated solution is obtained, then the concentrated solution is placed in a drying oven, the drying is carried out to constant weight under the condition that the temperature is 110 ℃, dried slag is obtained, the dried slag is placed in a muffle furnace, the calcination is carried out for 2h under the condition that the temperature is 600 ℃, and then the temperature is reduced to the room temperature along with the oven, and the modified sepiolite is obtained;
(2) according to the weight parts, 30 parts of bamboo fiber, 60 parts of sodium hydroxide solution, 60 parts of sulfuric acid, 60 parts of dopamine solution and 8 parts of ethyl orthosilicate are sequentially taken, the bamboo fiber and the sodium hydroxide solution with the mass fraction of 30% are placed in a No. 1 beaker, are stirred and mixed for 40-60 min under the condition that the rotating speed is 600r/min, are filtered, so that No. 1 filter residue is obtained, then the No. 1 filter residue is placed in the sulfuric acid with the mass fraction of 98%, are mixed and treated for 40-60 min, are filtered and washed, so that No. 2 filter residue is obtained, the No. 2 filter residue and the ethyl orthosilicate are mixed and ball-milled, then the dopamine solution with the mass concentration of 2.6mg/m L is added, are filtered and dried, so that No. 3 filter residue is obtained, then the No. 3 filter residue is placed in a sintering furnace, is heated to 1500 ℃ at the temperature of 10 ℃/min, is treated at the high temperature for 3h, and;
(3) according to the weight parts, 100 parts of sea sand, 40 parts of cement, 20 parts of fly ash, 20 parts of modified sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of polyethyleneimine aqueous solution, 20 parts of peach gum solution and 20 parts of modified fiber are sequentially taken, and the sea sand, the cement, the modified fly ash, the modified sepiolite, the water, the silane coupling agent, the polyethyleneimine aqueous solution with the mass fraction of 70%, the peach gum solution and the modified fiber are placed in a stirrer and are stirred and mixed for 60min under the condition that the rotating speed is 300r/min, so that the light high-strength concrete is obtained;
(4) and (6) detecting.
Example 3
The lightweight high-strength concrete comprises the following raw materials in parts by weight: 100 parts of sea sand, 40 parts of cement, 20 parts of modified fly ash, 20 parts of sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of polyethyleneimine water solution, 20 parts of peach gum solution and 20 parts of modified fiber.
The cement is sulfate cement.
The silane coupling agent is a silane coupling agent KH-550.
The preparation steps of the lightweight high-strength concrete are as follows:
(1) taking 100 parts of fly ash and 50 parts of deionized water in sequence by weight, placing the fly ash and the deionized water in a high-pressure reaction kettle, introducing liquid nitrogen into the reaction kettle at the speed of 8m L/min until the pressure of the reaction kettle reaches 2MPa, carrying out pressure-maintaining ultrasonic treatment for 20min, opening a discharge valve of the reaction kettle to spray the materials into a collecting barrel, then transferring the materials in the collecting barrel into a 90 ℃ oven, and drying for 5h to obtain modified fly ash;
(2) according to the weight parts, 30 parts of bamboo fiber, 60 parts of sodium hydroxide solution, 60 parts of sulfuric acid, 60 parts of dopamine solution and 8 parts of ethyl orthosilicate are sequentially taken, the bamboo fiber and the sodium hydroxide solution with the mass fraction of 30% are placed in a No. 1 beaker, are stirred and mixed for 40-60 min under the condition that the rotating speed is 600r/min, are filtered, so that No. 1 filter residue is obtained, then the No. 1 filter residue is placed in the sulfuric acid with the mass fraction of 98%, are mixed and treated for 40-60 min, are filtered and washed, so that No. 2 filter residue is obtained, the No. 2 filter residue and the ethyl orthosilicate are mixed and ball-milled, then the dopamine solution with the mass concentration of 2.6mg/m L is added, are filtered and dried, so that No. 3 filter residue is obtained, then the No. 3 filter residue is placed in a sintering furnace, is heated to 1500 ℃ at the temperature of 10 ℃/min, is treated at the high temperature for 3h, and;
(3) according to the weight parts, 100 parts of sea sand, 40 parts of cement, 20 parts of modified fly ash, 20 parts of modified sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of polyethyleneimine aqueous solution, 20 parts of peach gum solution and 20 parts of modified fiber are sequentially taken, and the sea sand, the cement, the modified fly ash, the sepiolite, the water, the silane coupling agent, the polyethyleneimine aqueous solution with the mass fraction of 70%, the peach gum solution and the modified fiber are placed in a stirrer and stirred and mixed for 60min under the condition that the rotating speed is 300r/min, so that the light high-strength concrete is obtained;
(4) and (6) detecting.
Example 4
The lightweight high-strength concrete comprises the following raw materials in parts by weight: 100 parts of sea sand, 40 parts of cement, 20 parts of modified fly ash, 20 parts of modified sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of peach gum solution and 20 parts of modified fiber.
The cement is sulfate cement.
The silane coupling agent is a silane coupling agent KH-550.
The preparation steps of the lightweight high-strength concrete are as follows:
(1) taking 100 parts of fly ash and 50 parts of deionized water in sequence by weight, placing the fly ash and the deionized water in a high-pressure reaction kettle, introducing liquid nitrogen into the reaction kettle at the speed of 8m L/min until the pressure of the reaction kettle reaches 2MPa, carrying out pressure-maintaining ultrasonic treatment for 20min, opening a discharge valve of the reaction kettle to spray the materials into a collecting barrel, then transferring the materials in the collecting barrel into a 90 ℃ oven, and drying for 5h to obtain modified fly ash;
(2) according to the weight parts, 20 parts of sepiolite, 100 parts of water, 3 parts of pasteurella, 5 parts of urea and 5 parts of magnesium sulfate are taken in sequence, the sepiolite is mixed with the water, the pasteurella is added, the urea and the magnesium nitrate are placed in a mixing kettle, the stirring and the mixing are carried out for 60min under the condition that the rotating speed is 600r/min, mixed slurry is obtained, then the mixed slurry is placed in a rotary evaporator, the rotary evaporation and the concentration are carried out for 60min under the condition that the temperature is 70 ℃, concentrated solution is obtained, then the concentrated solution is placed in a drying oven, the drying is carried out to constant weight under the condition that the temperature is 110 ℃, dried slag is obtained, the dried slag is placed in a muffle furnace, the calcination is carried out for 2h under the condition that the temperature is 600 ℃, and then the temperature is reduced to the room temperature along with the oven, and the modified sepiolite is obtained;
(3) according to the weight parts, 30 parts of bamboo fiber, 60 parts of sodium hydroxide solution, 60 parts of sulfuric acid, 60 parts of dopamine solution and 8 parts of ethyl orthosilicate are sequentially taken, the bamboo fiber and the sodium hydroxide solution with the mass fraction of 30% are placed in a No. 1 beaker, are stirred and mixed for 40-60 min under the condition that the rotating speed is 600r/min, are filtered, so that No. 1 filter residue is obtained, then the No. 1 filter residue is placed in the sulfuric acid with the mass fraction of 98%, are mixed and treated for 40-60 min, are filtered and washed, so that No. 2 filter residue is obtained, the No. 2 filter residue and the ethyl orthosilicate are mixed and ball-milled, then the dopamine solution with the mass concentration of 2.6mg/m L is added, are filtered and dried, so that No. 3 filter residue is obtained, then the No. 3 filter residue is placed in a sintering furnace, is heated to 1500 ℃ at the temperature of 10 ℃/min, is treated at the high temperature for 3h, and;
(4) sequentially taking 100 parts of sea sand, 40 parts of cement, 20 parts of modified fly ash, 20 parts of modified sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of peach gum solution and 20 parts of modified fiber, placing the sea sand, the cement, the modified fly ash, the modified sepiolite, the water, the silane coupling agent, the peach gum solution and the modified fiber in a stirrer, and stirring and mixing for 60min under the condition that the rotating speed is 300r/min to obtain the light high-strength concrete;
(5) and (6) detecting.
Example 5
The lightweight high-strength concrete comprises the following raw materials in parts by weight: 100 parts of sea sand, 40 parts of cement, 20 parts of modified fly ash, 20 parts of modified sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of polyethyleneimine water solution and 20 parts of peach gum solution.
The cement is sulfate cement.
The silane coupling agent is a silane coupling agent KH-550.
The preparation steps of the lightweight high-strength concrete are as follows:
(1) taking 100 parts of fly ash and 50 parts of deionized water in sequence by weight, placing the fly ash and the deionized water in a high-pressure reaction kettle, introducing liquid nitrogen into the reaction kettle at the speed of 8m L/min until the pressure of the reaction kettle reaches 2MPa, carrying out pressure-maintaining ultrasonic treatment for 20min, opening a discharge valve of the reaction kettle to spray the materials into a collecting barrel, then transferring the materials in the collecting barrel into a 90 ℃ oven, and drying for 5h to obtain modified fly ash;
(2) according to the weight parts, 20 parts of sepiolite, 100 parts of water, 3 parts of pasteurella, 5 parts of urea and 5 parts of magnesium sulfate are taken in sequence, the sepiolite is mixed with the water, the pasteurella is added, the urea and the magnesium nitrate are placed in a mixing kettle, the stirring and the mixing are carried out for 60min under the condition that the rotating speed is 600r/min, mixed slurry is obtained, then the mixed slurry is placed in a rotary evaporator, the rotary evaporation and the concentration are carried out for 60min under the condition that the temperature is 70 ℃, concentrated solution is obtained, then the concentrated solution is placed in a drying oven, the drying is carried out to constant weight under the condition that the temperature is 110 ℃, dried slag is obtained, the dried slag is placed in a muffle furnace, the calcination is carried out for 2h under the condition that the temperature is 600 ℃, and then the temperature is reduced to the room temperature along with the oven, and the modified sepiolite is obtained;
(3) according to the weight parts, 100 parts of sea sand, 40 parts of cement, 20 parts of modified fly ash, 20 parts of modified sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of polyethyleneimine aqueous solution, 20 parts of peach gum solution and 20 parts of modified fiber are sequentially taken, and the sea sand, the cement, the modified fly ash, the modified sepiolite, the water, the silane coupling agent, the polyethyleneimine aqueous solution with the mass fraction of 70% and the peach gum solution are placed in a stirrer and stirred and mixed for 60min under the condition that the rotating speed is 300r/min, so that the light high-strength concrete is obtained;
(4) and (6) detecting.
Example 6
The lightweight high-strength concrete comprises the following raw materials in parts by weight: 100 parts of sea sand, 40 parts of cement, 20 parts of fly ash, 20 parts of sepiolite, 30 parts of water, 5 parts of silane coupling agent and 20 parts of peach gum solution.
The cement is sulfate cement.
The silane coupling agent is a silane coupling agent KH-550.
The preparation steps of the lightweight high-strength concrete are as follows:
(1) according to the weight parts, 100 parts of sea sand, 40 parts of cement, 20 parts of fly ash, 20 parts of sepiolite, 30 parts of water, 5 parts of silane coupling agent and 20 parts of peach glue solution are sequentially taken, the sea sand, the cement, the modified fly ash, the modified sepiolite, the water, the silane coupling agent, the polyethyleneimine water solution with the mass fraction of 70%, the peach glue solution and the modified fiber are placed in a stirrer, and are stirred and mixed for 60min under the condition that the rotating speed is 300r/min, so that the light high-strength concrete is obtained;
(2) and (6) detecting.
Performance test table: TABLE 1
As can be seen from table 1: compared with the comparative examples in examples 1 and 2, in the preparation process, the invention adopts liquid nitrogen to be introduced into a reaction kettle containing fly ash and water, the inside of the reaction kettle is pressurized, pressure is maintained, and then the pressure is released, so that the materials in the reaction kettle are injected into a charging barrel, no external mechanical force is applied to crush the system in the whole process except the introduction of the liquid nitrogen for pressurization, the fly ash is a substance existing in a particle form and is a mixture of a composite structure consisting of crystals, a glass body and a small amount of unburned carbon, wherein the glass comprises smooth spherical particles with few irregular pores and the like, in the treatment process of the step (1), part of liquid nitrogen can enter the fly ash particles with few pores in the pressurization process of the liquid nitrogen, in the pressure release process, the liquid nitrogen is rapidly gasified, the surface part of the fly ash microsphere structure falls off, and the particle size of the falling part is smaller, for refined fragments, the process can ensure that the surface pores of the fly ash particles are instantly increased, and the hollow porous fly ash microsphere structure is effectively reserved, so that the fly ash particles can be used as a hollow porous framework to be dispersed in a system, and the technical effect of ensuring the light weight of the product is further improved; compared with the comparative examples in examples 1 and 3, the modified sepiolite is added with the pasteurella bacillus, the urea and the magnesium nitrate, so that the magnesium carbonate hollow microspheres and the ammonium nitrate can be formed in the preparation process of the modified sepiolite and are filled in the pores of the sepiolite, the hollow magnesium carbonate microspheres can be heated and decomposed in the use process in the calcination process to generate magnesium oxide and provide magnesium oxide raw materials for sintering, so that the product has better strength after being used, secondly, the ammonium nitrate contained in the modified sepiolite can be violently decomposed in the preparation process of the product and generates larger heat in the system, the energy required by internal sintering is provided, and meanwhile, all materials in the product are fully contacted, so that the strength of the sepiolite is further improved, and simultaneously, the violent decomposition of the ammonium nitrate causes a large number of pores to be formed in the system, the strength of the product is further improved while the light weight is ensured by using the modified sepiolite.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (2)
1. A preparation method of light high-strength concrete is characterized by comprising the following steps: the preparation steps are as follows:
(1) taking 100 parts of fly ash and 50 parts of deionized water in sequence by weight, placing the fly ash and the deionized water in a high-pressure reaction kettle, introducing liquid nitrogen into the reaction kettle at the speed of 8m L/min until the pressure of the reaction kettle reaches 2MPa, carrying out pressure-maintaining ultrasonic treatment for 20min, opening a discharge valve of the reaction kettle to spray the materials into a collecting barrel, then transferring the materials in the collecting barrel into a 90 ℃ oven, and drying for 5h to obtain modified fly ash;
(2) according to the weight parts, 20 parts of sepiolite, 100 parts of water, 3 parts of pasteurella, 5 parts of urea and 5 parts of magnesium sulfate are taken in sequence, the sepiolite is mixed with the water, the pasteurella is added, the urea and the magnesium nitrate are placed in a mixing kettle, the stirring and the mixing are carried out for 60min under the condition that the rotating speed is 600r/min, mixed slurry is obtained, then the mixed slurry is placed in a rotary evaporator, the rotary evaporation and the concentration are carried out for 60min under the condition that the temperature is 70 ℃, concentrated solution is obtained, then the concentrated solution is placed in a drying oven, the drying is carried out to constant weight under the condition that the temperature is 110 ℃, dried slag is obtained, the dried slag is placed in a muffle furnace, the calcination is carried out for 2h under the condition that the temperature is 600 ℃, and then the temperature is reduced to the room temperature along with the oven, and the modified sepiolite is obtained;
(3) according to the weight parts, 30 parts of bamboo fiber, 60 parts of sodium hydroxide solution, 60 parts of sulfuric acid, 60 parts of dopamine solution and 8 parts of ethyl orthosilicate are sequentially taken, the bamboo fiber and the sodium hydroxide solution with the mass fraction of 30% are placed in a No. 1 beaker, are stirred and mixed for 40-60 min under the condition that the rotating speed is 600r/min, are filtered, so that No. 1 filter residue is obtained, then the No. 1 filter residue is placed in the sulfuric acid with the mass fraction of 98%, are mixed and treated for 40-60 min, are filtered and washed, so that No. 2 filter residue is obtained, the No. 2 filter residue and the ethyl orthosilicate are mixed and ball-milled, then the dopamine solution with the mass concentration of 2.6mg/m L is added, are filtered and dried, so that No. 3 filter residue is obtained, then the No. 3 filter residue is placed in a sintering furnace, is heated to 1500 ℃ at the temperature of 10 ℃/min, is treated at the high temperature for 3h, and;
(4) according to the weight parts, 100 parts of sea sand, 40 parts of cement, 20 parts of modified fly ash, 20 parts of modified sepiolite, 30 parts of water, 5 parts of silane coupling agent, 20 parts of polyethyleneimine aqueous solution, 20 parts of peach gum solution and 20 parts of modified fiber are sequentially taken, and the sea sand, the cement, the modified fly ash, the modified sepiolite, the water, the silane coupling agent, the polyethyleneimine aqueous solution with the mass fraction of 70%, the peach gum solution and the modified fiber are placed in a stirrer and stirred and mixed for 60min under the condition that the rotating speed is 300r/min, so that the light high-strength concrete is obtained;
(5) and (6) detecting.
2. The method for preparing lightweight high-strength concrete according to claim 1, wherein the method comprises the following steps: the cement is silicate cement, and the silane coupling agent is a silane coupling agent KH-550.
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| CN116730677A (en) * | 2023-06-03 | 2023-09-12 | 广州市兴耀混凝土有限公司 | Impervious anti-cracking concrete and preparation method thereof |
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| CN111423179A (en) | 2020-07-17 |
| CN110467384B (en) | 2020-06-02 |
| CN110467384A (en) | 2019-11-19 |
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