CN111606735A - Light heat-preservation composite foam concrete and preparation method thereof - Google Patents
Light heat-preservation composite foam concrete and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—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
Abstract
The invention discloses light heat-insulating composite foam concrete and a preparation method thereof, and relates to the technical field of concrete materials. The preparation method comprises the steps of firstly reacting polypropylene fibers with acrylic acid under the catalysis of benzoyl peroxide to prepare modified polypropylene fibers, then mixing graphene oxide with carboxyl carbon nano tubes, reacting with polyethylene polyamine to prepare modified graphene oxide gel, then mixing the acrylic acid with acrylamide, preparing a base material under the action of a catalyst, mixing the base material with the modified graphene oxide gel for swelling, adding sodium bicarbonate, performing rotary evaporation and concentration, performing freeze drying to prepare a composite foaming agent, finally mixing the composite foaming agent with cement, adding a waterproof agent, a coagulant, fly ash, the modified polypropylene fibers and sand, and stirring and mixing to obtain the light heat-preservation composite foam concrete. The light heat-insulating composite foam concrete prepared by the invention has smaller density and good heat-insulating property, and the compressive strength of the light heat-insulating composite foam concrete is not much different from that of the common foam concrete.
Description
Technical Field
The invention relates to the technical field of concrete materials, in particular to light heat-insulating composite foam concrete and a preparation method thereof.
Background
At present, the common light heat-insulating composite foam concrete which is mostly used in industrial and civil buildings has the strength (generally 20-30MPa) which can basically meet the requirements of building structures, but is heavy. However, the existing common light heat-insulating composite foam concrete and the aerated light heat-insulating composite foam concrete both belong to brittle materials, and are easy to generate micro cracks due to shrinkage and even completely damage. The light-weight heat-insulating composite foam concrete on 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, the aerated light heat-preservation composite foam concrete is very brittle and is easy to break in the transportation and construction processes. Therefore, it is urgently needed to prepare the foam light heat-insulating composite foam concrete with light weight, high strength, water resistance and cracking resistance.
Disclosure of Invention
The invention aims to provide light heat-insulating composite foam concrete and a preparation method thereof, and aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the light heat-insulating composite foam concrete is characterized by mainly comprising the following raw material components in parts by weight: 40-60 parts of cement, 2-4 parts of a coagulant, 2-6 parts of a waterproof agent, 8-15 parts of fly ash, 5-10 parts of modified polypropylene fiber and 10-12 parts of sand.
The light heat-insulation composite foam concrete is characterized by also comprising the following raw material components in parts by weight: 5-8 parts of a composite foaming agent.
Preferably, the cement is ordinary 42.5R portland cement; the coagulant is a mixture of sodium chloride and triethanolamine; the waterproof agent is a polycarboxylate water reducing agent; the sand is river sand with the mesh number of 250-300 meshes.
Preferably, the modified polypropylene fiber is prepared by the reaction of polypropylene fiber and acrylic acid under the catalysis of benzoyl peroxide.
Preferably, the composite foaming agent is prepared from acrylic acid, acrylamide, ammonium bicarbonate, graphene, carbon nano tubes, polyethylene polyamine and sodium bicarbonate serving as raw materials.
As optimization, the light heat-insulating composite foam concrete mainly comprises the following raw material components in parts by weight: 50 parts of ordinary 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fiber, 12 parts of sand and 8 parts of a composite foaming agent.
As optimization, the preparation method of the light heat-preservation composite foam concrete mainly comprises the following preparation steps:
(1) mixing graphene oxide and a carboxyl carbon nanotube in water, freezing and drying to obtain graphene oxide aerogel, mixing the graphene oxide aerogel with the water, adjusting the pH, adding polyethylene polyamine and a glucose beta lactone aqueous solution, stirring for reaction, freezing and drying to obtain a modified graphene oxide gel blank, and placing the modified graphene oxide gel blank in a carbon dioxide atmosphere for treatment to obtain modified graphene oxide gel;
(2) mixing an acrylic acid solution with an acrylamide solution, adding an N, N '-methylene bisacrylamide solution, a poly (ethylene oxide/propylene oxide) solution, an ammonium persulfate solution, an N, N, N', N '-tetramethylethylamine solution, an N' O-carboxymethyl chitosan solution and sodium bicarbonate, stirring for reaction, and performing vacuum drying to obtain a base material;
(3) mixing the modified graphene oxide gel obtained in the step (1) with water, adding the base material obtained in the step (2), mixing and swelling, adding ammonium bicarbonate until crystals are separated out, performing rotary evaporation and concentration, and performing freeze drying to obtain a composite foaming agent;
(4) mixing the composite foaming agent obtained in the step (3) with cement, adding a coagulant, a waterproof agent, fly ash, modified polypropylene fiber and sand, and stirring and mixing to obtain light heat-preservation composite foam concrete;
(5) and (4) carrying out index analysis on the light heat-preservation composite foam concrete obtained in the step (4).
As optimization, the preparation method of the light heat-preservation composite foam concrete mainly comprises the following preparation steps:
(1) mixing graphene oxide and a carboxyl carbon nanotube according to a mass ratio of 10: 1, adding water which is 10-12 times of the mass of the graphene oxide, stirring and mixing for 30-50 min under the condition that the rotating speed is 800-1200 r/min, freeze-drying to obtain graphene oxide aerogel, and mixing the graphene oxide aerogel with the water according to the mass ratio of 1: 20-1: 30, mixing the materials in a beaker, adjusting the pH of the materials in the beaker to 8 by using a sodium hydroxide solution with the mass fraction of 5%, adding polyethylene polyamine with the mass fraction of 0.3-0.5 times that of graphene oxide aerogel and a glucose beta-lactone aqueous solution with the mass fraction of 30% with the mass fraction of 2-4 times that of the graphene oxide aerogel into the beaker, carrying out ultrasonic reaction for 45min under the condition of the frequency of 55kHz, carrying out freeze drying to obtain a modified graphene oxide gel blank, and placing the modified graphene oxide gel blank in a carbon dioxide atmosphere for treatment for 1-5 h to obtain modified graphene oxide gel;
(2) mixing 50% by mass of acrylic acid solution and 50% by mass of acrylamide solution according to a volume ratio of 3:2 in a flask, adding 0.1 time of acrylic acid solution volume, 2.5% by mass of N, N '-methylene bisacrylamide solution, 0.1 time of acrylic acid solution volume, 10% by mass of poly (ethylene oxide/propylene oxide) solution, 0.08 time of acrylic acid solution volume, 20% by mass of ammonium persulfate solution, 0.08 time of acrylic acid solution volume, 16.7% by mass of N, N, N', N '-tetramethylethylamine solution, 0.3 time of acrylic acid solution volume, 1% by mass of N' O-carboxymethyl chitosan solution and 8-10 times by mass of acrylic acid solution, stirring and reacting for 1-3 hours at a temperature of 50 ℃ and a rotation speed of 380r/min, vacuum drying to obtain a base material;
(3) mixing the modified graphene oxide gel obtained in the step (1) with water according to a mass ratio of 1:3, mixing the mixture in a reaction kettle, adding the base material obtained in the step (2) with the mass of 8-20 times that of the modified graphene oxide gel into the reaction kettle, mixing and swelling for 3-5 hours, adding ammonium bicarbonate into the reaction kettle until crystals are separated out, performing rotary evaporation and concentration, and performing freeze drying to obtain the composite foaming agent;
(4) weighing the following components in parts by weight: 50 parts of common 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fibers, 12 parts of sand and 8 parts of a composite foaming agent, mixing the composite foaming agent obtained in the step (3) and the common 42.5R portland cement in a stirrer, adding the coagulant, the waterproof agent, the fly ash, the modified polypropylene fibers and the sand into the stirrer, and stirring and mixing to obtain the light heat-preservation composite foam concrete;
(5) and (4) carrying out index analysis on the light heat-preservation composite foam concrete obtained in the step (4).
Preferably, the coagulant in the step (4) is obtained by mixing sodium chloride and triethanolamine according to the mass ratio of 1: 4.
Preferably, the modified polypropylene fiber in the step (4) is prepared by mixing polypropylene fiber and 10% by mass of acrylic acid solution, wherein the mass ratio of 1: 15, adding benzoyl peroxide with the mass of 0.3-0.5 time of that of the polypropylene fiber, stirring and reacting for 75min at the temperature of 75 ℃, filtering to obtain a modified polypropylene fiber blank, and drying the modified polypropylene fiber blank for 3h at the temperature of 80 ℃ to obtain the modified polypropylene fiber.
Compared with the prior art, the invention has the beneficial effects that:
the self-made composite foaming agent is added when the light heat-preservation composite foam concrete is prepared. Firstly, the graphene oxide aerogel processed by polyethylene polyamine is added into the composite foaming agent, so that the graphene oxide aerogel has the function of adsorbing carbon dioxide, after the composite foaming agent is added into concrete, carbon dioxide can be released under the action of cement hydration heat in the cement hydration process, so that the effect of the foaming agent is achieved, the porosity inside the concrete is improved, the heat preservation performance of the product is improved, and the density of the product is reduced, secondly, the large-aperture gel is also added into the composite foaming agent, sodium bicarbonate is deposited inside the gel, after the sodium bicarbonate is added into the concrete, the sodium bicarbonate can be decomposed under the action of the cement hydration heat to generate carbon dioxide to be filled in holes of the large-aperture gel, so that the porosity of the foam concrete is improved, the content of continuous bubbles in the product is reduced, and the low density and heat preservation performance of the product are ensured, the product has better compressive strength; moreover, the large-aperture gel in the composite foaming agent forms a coating structure for the modified graphene oxide gel, so that the inside of the large-aperture gel is supported by a carbon skeleton, the strength of the large-aperture gel is improved, and after the large-aperture gel is added into concrete, the concrete has good mechanical properties under the condition of low density, and the compressive strength of a product is improved.
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 provided by the present invention, the following examples are used to describe the method for testing each index of the light weight thermal insulation composite foam concrete prepared in the following examples as follows:
and (3) density measurement: the light heat-preservation composite foam concrete obtained in each example, the comparative product and water are mixed according to the water-cement ratio of 0.4, and the density grade after curing is tested according to GB/T2542.
Compressive strength: the light heat-preservation composite foam concrete obtained in each example, the comparative product and water are mixed according to the water-cement ratio of 0.4, and the compressive strength after curing is tested according to GB/T29062.
Coefficient of thermal conductivity: the light heat-preservation composite foam concrete obtained in each example, the comparative product and water are mixed according to the water-cement ratio of 0.4, and the heat conductivity coefficient after curing is tested according to GB/T10294.
Example 1
A light heat-insulating composite foam concrete mainly comprises the following components in parts by weight: 50 parts of ordinary 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fiber, 12 parts of sand and 8 parts of a composite foaming agent.
A preparation method of light heat-insulating composite foam concrete mainly comprises the following preparation steps:
(1) mixing graphene oxide and a carboxyl carbon nanotube according to a mass ratio of 10: 1, adding water with the mass being 12 times that of the graphene oxide, stirring and mixing for 45min under the condition that the rotating speed is 1000r/min, freezing and drying to obtain graphene oxide aerogel, mixing the graphene oxide aerogel with the water according to the mass ratio of 1: 25, mixing the materials in a beaker, adjusting the pH of the materials in the beaker to 8 by using a sodium hydroxide solution with the mass fraction of 5%, adding polyethylene polyamine with the mass of 0.4 time of that of the graphene oxide aerogel and a glucose beta-lactone aqueous solution with the mass fraction of 30% with the mass of 3 times of that of the graphene oxide aerogel into the beaker, carrying out ultrasonic reaction for 45min under the condition of the frequency of 55kHz, freezing and drying to obtain a modified graphene oxide gel blank, and placing the modified graphene oxide gel blank in a carbon dioxide atmosphere for treatment for 3h to obtain modified graphene oxide gel;
(2) mixing 50% of acrylic acid solution and 50% of acrylamide solution according to the volume ratio of 3:2 in a flask, adding 0.1 time of acrylic acid solution volume, 2.5% of N, N '-methylene bisacrylamide solution, 0.1 time of acrylic acid solution volume, 10% of poly (ethylene oxide/propylene oxide) solution, 0.08 time of acrylic acid solution volume, 20% of ammonium persulfate solution, 0.08 time of acrylic acid solution volume, 16.7% of N, N, N', N '-tetramethylethylamine solution, 0.3 time of acrylic acid solution volume, 1% of N' O-carboxymethyl chitosan solution and 10 times of sodium bicarbonate, stirring and reacting for 3 hours at 50 ℃ and 380r/min of rotation speed, vacuum drying to obtain a base material;
(3) mixing the modified graphene oxide gel obtained in the step (1) with water according to a mass ratio of 1:3, mixing the mixture in a reaction kettle, adding the base material obtained in the step (2) with the mass of 8-20 times that of the modified graphene oxide gel into the reaction kettle, mixing and swelling for 5 hours, adding ammonium bicarbonate into the reaction kettle until crystals are separated out, carrying out rotary evaporation and concentration for 6 hours under the conditions that the temperature is 30 ℃ and the pressure is 500kPa, and carrying out freeze drying to obtain the composite foaming agent;
(4) weighing the following components in parts by weight: 50 parts of common 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fibers, 12 parts of sand and 8 parts of a composite foaming agent, mixing the composite foaming agent obtained in the step (3) and the common 42.5R portland cement in a stirrer, adding the coagulant, the waterproof agent, the fly ash, the modified polypropylene fibers and the sand into the stirrer, and stirring and mixing to obtain the light heat-preservation composite foam concrete;
(5) and (4) carrying out index analysis on the light heat-preservation composite foam concrete obtained in the step (4).
Preferably, the coagulant in the step (4) is obtained by mixing sodium chloride and triethanolamine according to the mass ratio of 1: 4.
Preferably, the modified polypropylene fiber in the step (4) is prepared by mixing polypropylene fiber and 10% by mass of acrylic acid solution, wherein the mass ratio of 1: 15, adding benzoyl peroxide with the mass of 0.4 time of that of the polypropylene fiber, stirring and reacting for 75min at the temperature of 75 ℃, filtering to obtain a modified polypropylene fiber blank, and drying the modified polypropylene fiber blank for 3h at the temperature of 80 ℃ to obtain the modified polypropylene fiber.
Example 2
A light heat-insulating composite foam concrete mainly comprises the following components in parts by weight: 50 parts of ordinary 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fiber, 12 parts of sand and 8 parts of a composite foaming agent.
A preparation method of light heat-insulating composite foam concrete mainly comprises the following preparation steps:
(1) mixing graphene oxide and a carboxyl carbon nanotube according to a mass ratio of 10: 1, adding water with the mass being 12 times that of the graphene oxide, stirring and mixing for 45min under the condition that the rotating speed is 1000r/min, freezing and drying to obtain graphene oxide aerogel, mixing the graphene oxide aerogel with the water according to the mass ratio of 1: 25, mixing the materials in a beaker, adjusting the pH of the materials in the beaker to 8 by using a sodium hydroxide solution with the mass fraction of 5%, adding polyethylene polyamine with the mass of 0.4 time of that of the graphene oxide aerogel and a glucose beta-lactone aqueous solution with the mass fraction of 30% with the mass of 3 times of that of the graphene oxide aerogel into the beaker, carrying out ultrasonic reaction for 45min under the condition of the frequency of 55kHz, freezing and drying to obtain a modified graphene oxide gel blank, and placing the modified graphene oxide gel blank in a carbon dioxide atmosphere for treatment for 3h to obtain modified graphene oxide gel;
(2) mixing 50% of acrylic acid solution and 50% of acrylamide solution according to the volume ratio of 3:2 in a flask, adding 0.1 time of acrylic acid solution volume, 2.5% of N, N '-methylene bisacrylamide solution, 0.1 time of acrylic acid solution volume, 10% of poly (ethylene oxide/propylene oxide) solution, 0.08 time of acrylic acid solution volume, 20% of ammonium persulfate solution, 0.08 time of acrylic acid solution volume, 16.7% of N, N, N', N '-tetramethylethylamine solution, 0.3 time of acrylic acid solution volume, 1% of N' O-carboxymethyl chitosan solution and 10 times of sodium bicarbonate, stirring and reacting for 3 hours at 50 ℃ and 380r/min of rotation speed, vacuum drying to obtain a base material;
(3) mixing the modified graphene oxide gel obtained in the step (1) and the base material obtained in the step (2) according to a mass ratio of 1: 2, mixing to obtain a composite foaming agent;
(4) weighing the following components in parts by weight: 50 parts of common 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fibers, 12 parts of sand and 8 parts of a composite foaming agent, mixing the composite foaming agent obtained in the step (3) and the common 42.5R portland cement in a stirrer, adding the coagulant, the waterproof agent, the fly ash, the modified polypropylene fibers and the sand into the stirrer, and stirring and mixing to obtain the light heat-preservation composite foam concrete;
(5) and (4) carrying out index analysis on the light heat-preservation composite foam concrete obtained in the step (4).
Preferably, the coagulant in the step (4) is obtained by mixing sodium chloride and triethanolamine according to the mass ratio of 1: 4.
Preferably, the modified polypropylene fiber in the step (4) is prepared by mixing polypropylene fiber and 10% by mass of acrylic acid solution, wherein the mass ratio of 1: 15, adding benzoyl peroxide with the mass of 0.4 time of that of the polypropylene fiber, stirring and reacting for 75min at the temperature of 75 ℃, filtering to obtain a modified polypropylene fiber blank, and drying the modified polypropylene fiber blank for 3h at the temperature of 80 ℃ to obtain the modified polypropylene fiber.
Example 3
A light heat-insulating composite foam concrete mainly comprises the following components in parts by weight: 50 parts of ordinary 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fiber, 12 parts of sand and 8 parts of a composite foaming agent.
A preparation method of light heat-insulating composite foam concrete mainly comprises the following preparation steps:
(1) mixing graphene oxide and a carboxyl carbon nanotube according to a mass ratio of 10: 1, mixing, adding water with the mass being 12 times that of the graphene oxide, stirring and mixing for 45min under the condition that the rotating speed is 1000r/min, and freeze-drying to obtain graphene oxide aerogel;
(2) mixing 50% of acrylic acid solution and 50% of acrylamide solution according to the volume ratio of 3:2 in a flask, adding 0.1 time of acrylic acid solution volume, 2.5% of N, N '-methylene bisacrylamide solution, 0.1 time of acrylic acid solution volume, 10% of poly (ethylene oxide/propylene oxide) solution, 0.08 time of acrylic acid solution volume, 20% of ammonium persulfate solution, 0.08 time of acrylic acid solution volume, 16.7% of N, N, N', N '-tetramethylethylamine solution, 0.3 time of acrylic acid solution volume, 1% of N' O-carboxymethyl chitosan solution and 10 times of sodium bicarbonate, stirring and reacting for 3 hours at 50 ℃ and 380r/min of rotation speed, vacuum drying to obtain a base material;
(3) mixing the graphene oxide aerogel obtained in the step (1) with water according to a mass ratio of 1:3, mixing the mixture in a reaction kettle, adding the base material obtained in the step (2) with the mass of 8-20 times that of the modified graphene oxide gel into the reaction kettle, mixing and swelling for 5 hours, adding ammonium bicarbonate into the reaction kettle until crystals are separated out, carrying out rotary evaporation and concentration for 6 hours under the conditions that the temperature is 30 ℃ and the pressure is 500kPa, and carrying out freeze drying to obtain the composite foaming agent;
(4) weighing the following components in parts by weight: 50 parts of common 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fibers, 12 parts of sand and 8 parts of a composite foaming agent, mixing the composite foaming agent obtained in the step (3) and the common 42.5R portland cement in a stirrer, adding the coagulant, the waterproof agent, the fly ash, the modified polypropylene fibers and the sand into the stirrer, and stirring and mixing to obtain the light heat-preservation composite foam concrete;
(5) and (4) carrying out index analysis on the light heat-preservation composite foam concrete obtained in the step (4).
Preferably, the coagulant in the step (4) is obtained by mixing sodium chloride and triethanolamine according to the mass ratio of 1: 4.
Preferably, the modified polypropylene fiber in the step (4) is prepared by mixing polypropylene fiber and 10% by mass of acrylic acid solution, wherein the mass ratio of 1: 15, adding benzoyl peroxide with the mass of 0.4 time of that of the polypropylene fiber, stirring and reacting for 75min at the temperature of 75 ℃, filtering to obtain a modified polypropylene fiber blank, and drying the modified polypropylene fiber blank for 3h at the temperature of 80 ℃ to obtain the modified polypropylene fiber.
Comparative example
A light heat-insulating composite foam concrete mainly comprises the following components in parts by weight: 50 parts of ordinary 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fiber, 12 parts of sand and 8 parts of a composite foaming agent.
A preparation method of light heat-insulating composite foam concrete mainly comprises the following preparation steps:
(1) mixing graphene oxide and a carboxyl carbon nanotube according to a mass ratio of 10: 1, mixing, adding water with the mass being 12 times that of the graphene oxide, stirring and mixing for 45min under the condition that the rotating speed is 1000r/min, and freeze-drying to obtain graphene oxide aerogel;
(2) mixing 50% of acrylic acid solution and 50% of acrylamide solution according to the volume ratio of 3:2 in a flask, adding 0.1 time of acrylic acid solution volume, 2.5% of N, N '-methylene bisacrylamide solution, 0.1 time of acrylic acid solution volume, 10% of poly (ethylene oxide/propylene oxide) solution, 0.08 time of acrylic acid solution volume, 20% of ammonium persulfate solution, 0.08 time of acrylic acid solution volume, 16.7% of N, N, N', N '-tetramethylethylamine solution, 0.3 time of acrylic acid solution volume, 1% of N' O-carboxymethyl chitosan solution and 10 times of sodium bicarbonate, stirring and reacting for 3 hours at 50 ℃ and 380r/min of rotation speed, vacuum drying to obtain a base material;
(3) mixing the graphene oxide aerogel obtained in the step (1) and the base material obtained in the step (2) according to a mass ratio of 1: 2, mixing to obtain a composite foaming agent;
(4) weighing the following components in parts by weight: 50 parts of common 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fibers, 12 parts of sand and 8 parts of a composite foaming agent, mixing the composite foaming agent obtained in the step (3) and the common 42.5R portland cement in a stirrer, adding the coagulant, the waterproof agent, the fly ash, the modified polypropylene fibers and the sand into the stirrer, and stirring and mixing to obtain the light heat-preservation composite foam concrete;
(5) and (4) carrying out index analysis on the light heat-preservation composite foam concrete obtained in the step (4).
Preferably, the coagulant in the step (4) is obtained by mixing sodium chloride and triethanolamine according to the mass ratio of 1: 4.
Preferably, the modified polypropylene fiber in the step (4) is prepared by mixing polypropylene fiber and 10% by mass of acrylic acid solution, wherein the mass ratio of 1: 15, adding benzoyl peroxide with the mass of 0.4 time of that of the polypropylene fiber, stirring and reacting for 75min at the temperature of 75 ℃, filtering to obtain a modified polypropylene fiber blank, and drying the modified polypropylene fiber blank for 3h at the temperature of 80 ℃ to obtain the modified polypropylene fiber.
Examples of effects
Table 1 below shows the results of performance analysis of the lightweight thermal insulation composite foam concrete using examples 1 to 3 of the present invention and a comparative example.
TABLE 1
The experimental data comparison between the example 1 and the comparative example in the table 1 shows that the self-made composite foaming agent is added to effectively improve the thermal insulation performance of the foam concrete when the light thermal insulation composite foam concrete is prepared, and the density of the foam concrete is reduced while the reduction of the compressive strength of the product is ensured to be small, and the experimental data comparison between the example 1 and the example 2 shows that when the modified graphene oxide gel and the base material in the composite foaming agent are simply blended, the content of the composite foaming agent, namely sodium bicarbonate, is reduced, so that the composite foaming agent does not achieve the optimal foaming effect; from the comparison of the experimental data of example 1 and example 3, it can be found that when the graphene oxide and the carboxyl carbon nanotubes in the modified graphene oxide gel in the composite foaming agent do not react with polyethylene polyamine, the modified graphene oxide gel cannot adsorb carbon dioxide, so that the foaming performance of the product is reduced, and the thermal insulation performance and the density grade of the foam concrete are affected.
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. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The light heat-insulating composite foam concrete is characterized by mainly comprising the following raw material components in parts by weight: 40-60 parts of cement, 2-4 parts of a coagulant, 2-6 parts of a waterproof agent, 8-15 parts of fly ash, 5-10 parts of modified polypropylene fiber and 10-12 parts of sand.
2. The light-weight heat-insulation composite foam concrete as claimed in claim 1, further comprising the following raw material components in parts by weight: 5-8 parts of a composite foaming agent.
3. The lightweight thermal insulating composite foam concrete according to claim 2, wherein the cement is ordinary 42.5R portland cement; the coagulant is a mixture of sodium chloride and triethanolamine; the waterproof agent is a polycarboxylate water reducing agent; the sand is river sand with the mesh number of 250-300 meshes.
4. The lightweight thermal insulation composite foam concrete according to claim 3, wherein the modified polypropylene fiber is prepared by the reaction of polypropylene fiber and acrylic acid under the catalysis of benzoyl peroxide.
5. The lightweight thermal insulation composite foam concrete according to claim 4, wherein the composite foaming agent is prepared from acrylic acid, acrylamide, ammonium bicarbonate, graphene, carbon nanotubes, polyethylene polyamine and sodium bicarbonate.
6. The light-weight thermal insulation composite foam concrete as claimed in claim 5, which is characterized by mainly comprising the following raw material components in parts by weight: 50 parts of ordinary 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fiber, 12 parts of sand and 8 parts of a composite foaming agent.
7. A preparation method of light heat-preservation composite foam concrete is characterized by mainly comprising the following preparation steps:
(1) mixing graphene oxide and a carboxyl carbon nanotube in water, freezing and drying to obtain graphene oxide aerogel, mixing the graphene oxide aerogel with the water, adjusting the pH, adding polyethylene polyamine and a glucose beta lactone aqueous solution, stirring for reaction, freezing and drying to obtain a modified graphene oxide gel blank, and placing the modified graphene oxide gel blank in a carbon dioxide atmosphere for treatment to obtain modified graphene oxide gel;
(2) mixing an acrylic acid solution with an acrylamide solution, adding an N, N '-methylene bisacrylamide solution, a poly (ethylene oxide/propylene oxide) solution, an ammonium persulfate solution, an N, N, N', N '-tetramethylethylamine solution, an N' O-carboxymethyl chitosan solution and sodium bicarbonate, stirring for reaction, and performing vacuum drying to obtain a base material;
(3) mixing the modified graphene oxide gel obtained in the step (1) with water, adding the base material obtained in the step (2), mixing and swelling, adding ammonium bicarbonate until crystals are separated out, performing rotary evaporation and concentration, and performing freeze drying to obtain a composite foaming agent;
(4) mixing the composite foaming agent obtained in the step (3) with cement, adding a coagulant, a waterproof agent, fly ash, modified polypropylene fiber and sand, and stirring and mixing to obtain light heat-preservation composite foam concrete;
(5) and (4) carrying out index analysis on the light heat-preservation composite foam concrete obtained in the step (4).
8. The preparation method of the light weight heat preservation composite foam concrete according to claim 7, characterized by mainly comprising the following preparation steps:
(1) mixing graphene oxide and a carboxyl carbon nanotube according to a mass ratio of 10: 1, adding water which is 10-12 times of the mass of the graphene oxide, stirring and mixing for 30-50 min under the condition that the rotating speed is 800-1200 r/min, freeze-drying to obtain graphene oxide aerogel, and mixing the graphene oxide aerogel with the water according to the mass ratio of 1: 20-1: 30, mixing the materials in a beaker, adjusting the pH of the materials in the beaker to 8 by using a sodium hydroxide solution with the mass fraction of 5%, adding polyethylene polyamine with the mass fraction of 0.3-0.5 times that of graphene oxide aerogel and a glucose beta-lactone aqueous solution with the mass fraction of 30% with the mass fraction of 2-4 times that of the graphene oxide aerogel into the beaker, carrying out ultrasonic reaction for 45min under the condition of the frequency of 55kHz, carrying out freeze drying to obtain a modified graphene oxide gel blank, and placing the modified graphene oxide gel blank in a carbon dioxide atmosphere for treatment for 1-5 h to obtain modified graphene oxide gel;
(2) mixing 50% by mass of acrylic acid solution and 50% by mass of acrylamide solution according to a volume ratio of 3:2 in a flask, adding 0.1 time of acrylic acid solution volume, 2.5% by mass of N, N '-methylene bisacrylamide solution, 0.1 time of acrylic acid solution volume, 10% by mass of poly (ethylene oxide/propylene oxide) solution, 0.08 time of acrylic acid solution volume, 20% by mass of ammonium persulfate solution, 0.08 time of acrylic acid solution volume, 16.7% by mass of N, N, N', N '-tetramethylethylamine solution, 0.3 time of acrylic acid solution volume, 1% by mass of N' O-carboxymethyl chitosan solution and 8-10 times by mass of acrylic acid solution, stirring and reacting for 1-3 hours at a temperature of 50 ℃ and a rotation speed of 380r/min, vacuum drying to obtain a base material;
(3) mixing the modified graphene oxide gel obtained in the step (1) with water according to a mass ratio of 1:3, mixing the mixture in a reaction kettle, adding the base material obtained in the step (2) with the mass of 8-20 times that of the modified graphene oxide gel into the reaction kettle, mixing and swelling for 3-5 hours, adding ammonium bicarbonate into the reaction kettle until crystals are separated out, performing rotary evaporation and concentration, and performing freeze drying to obtain the composite foaming agent;
(4) weighing the following components in parts by weight: 50 parts of common 42.5R portland cement, 4 parts of a coagulant, 4 parts of a waterproof agent, 10 parts of fly ash, 8 parts of modified polypropylene fibers, 12 parts of sand and 8 parts of a composite foaming agent, mixing the composite foaming agent obtained in the step (3) and the common 42.5R portland cement in a stirrer, adding the coagulant, the waterproof agent, the fly ash, the modified polypropylene fibers and the sand into the stirrer, and stirring and mixing to obtain the light heat-preservation composite foam concrete;
(5) and (4) carrying out index analysis on the light heat-preservation composite foam concrete obtained in the step (4).
9. The preparation method of the light-weight heat-preservation composite foam concrete as claimed in claim 7, wherein the setting accelerator in the step (4) is obtained by mixing sodium chloride and triethanolamine in a mass ratio of 1: 4.
10. The preparation method of the lightweight thermal insulation composite foam concrete according to claim 7, wherein the modified polypropylene fiber in the step (4) is prepared by mixing polypropylene fiber with 10 mass percent of acrylic acid solution, wherein the mass ratio of the acrylic acid solution is 1: 15, adding benzoyl peroxide with the mass of 0.3-0.5 time of that of the polypropylene fiber, stirring and reacting for 75min at the temperature of 75 ℃, filtering to obtain a modified polypropylene fiber blank, and drying the modified polypropylene fiber blank for 3h at the temperature of 80 ℃ to obtain the modified polypropylene fiber.
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