CN111170701A - Heat-insulating and low-hygroscopicity aerated concrete for energy-saving building and preparation method thereof - Google Patents

Heat-insulating and low-hygroscopicity aerated concrete for energy-saving building and preparation method thereof Download PDF

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CN111170701A
CN111170701A CN202010188405.8A CN202010188405A CN111170701A CN 111170701 A CN111170701 A CN 111170701A CN 202010188405 A CN202010188405 A CN 202010188405A CN 111170701 A CN111170701 A CN 111170701A
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silicon dioxide
aluminum powder
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water
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蔡杰
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Chengdu Shuilongtou Chemical Technology Co ltd
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Chengdu Shuilongtou Chemical Technology Co ltd
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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
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention relates to the field of building concrete materials, and provides a thermal insulation and low-hygroscopicity aerated concrete for energy-saving buildings and a preparation method thereof. The outer surface of the aerated concrete block prepared by the invention is provided with the super-hydrophobic layer with low surface energy, so that external moisture can be prevented from invading the interior of concrete; the surface of the inner pore channel wall also has super-hydrophobicity, so that the invasion and diffusion of water in the concrete can be greatly reduced. Under the combined action of the super-hydrophobic outer surface of the concrete block and the super-hydrophobic inner pore channel wall, the obtained aerated concrete has low hygroscopicity, can resist moisture invasion in a high-humidity environment, keeps a low heat conductivity coefficient, and prevents the heat insulation effect from being greatly reduced.

Description

Heat-insulating and low-hygroscopicity aerated concrete for energy-saving building and preparation method thereof
Technical Field
The invention belongs to the technical field of building concrete materials, and provides a thermal insulation and low-hygroscopicity aerated concrete for an energy-saving building and a preparation method thereof.
Background
With the rapid development of the building industry, the occupation ratio of building energy consumption in the total social energy consumption is higher and higher, and more attention is paid to the development of green energy-saving buildings. Among the energy-saving building materials, the aerated concrete has the advantages of light weight, good heat insulation performance, strong sound insulation and the like. The aerated concrete is prepared by adding a gas former on the basis of a mixed ingredient of a calcareous material and a siliceous material, adding water, stirring, casting, autoclaving and the like, wherein the interior of the block contains a large number of macroscopic pores and microscopic pores, and when the pores are filled with air, the block has a low heat conductivity coefficient. The aerated concrete block is used for the envelope structure of the building instead of the clay brick, the hollow brick or the common concrete, so that the heat insulation performance of the building can be improved, and the energy consumption is reduced.
However, because the building envelope is in contact with the surrounding hot and humid environment at any time, and the aerated concrete has a large amount of porous structures inside, a strong wet migration process exists, and the heat insulation performance of the concrete is obviously reduced by the water entering the aerated concrete. Therefore, in a high humidity environment, the heat conductivity of the aerated concrete increases due to the high hygroscopicity, and the heat insulation effect is greatly reduced.
Disclosure of Invention
It can be seen that the aerated concrete has the defect that the heat insulation effect in a high-humidity environment is greatly reduced. Aiming at the situation, the invention provides the aerated concrete with heat insulation and heat preservation and low hygroscopicity for the energy-saving building and the preparation method thereof.
In order to achieve the purpose, the invention relates to the following specific technical scheme:
the invention firstly provides a preparation method of heat-insulating and low-hygroscopicity aerated concrete for energy-saving buildings, which comprises the following specific steps:
(1) adding air-entraining aluminum powder, a dispersing agent, a coupling agent and a corrosion inhibitor into water, and uniformly dispersing by ultrasonic to obtain an aluminum powder dispersion liquid;
(2) spraying and depositing the aluminum powder dispersion liquid on the surface of the nano-scale silicon dioxide particles to obtain aluminum powder coated nano-silica;
(3) spraying and depositing the aluminum powder dispersion liquid on the surfaces of the micron-sized silicon dioxide particles to obtain aluminum powder coated micron-sized silicon dioxide;
(4) uniformly mixing aluminum powder coated nano silicon dioxide, aluminum powder coated micro silicon dioxide and water at 50 ℃ to obtain a mixed suspension;
(5) adding cement, fly ash, quicklime, quartz sand, gypsum and reinforcing fibers into a stirrer, stirring for 3-10 min, then adding water at 50 ℃, continuously stirring for 2-3 min, then adding mixed suspension, and continuously stirring for 20-30 s to obtain slurry;
(6) pouring the slurry into a mold coated with demolding oil, standing for 4-5 hours in a constant-temperature drying oven at 50 ℃, then cutting off the bread ends, and continuing to stand for 4-8 hours;
(7) removing the mold, and then placing the concrete block in a high-pressure steam box at the temperature of 200-220 ℃ for curing for 24-48 h;
(8) adding the nano-scale silicon dioxide particles, the micron-scale silicon dioxide particles, the dispersing agent and the dimethyl silicone oil into water, uniformly dispersing, spraying the mixture on each surface of the concrete block, and drying to obtain the aerated concrete with heat insulation and low hygroscopicity.
Preferably, the dispersant is at least one of coco glucoside, lauryl glucoside and cetearyl glucoside.
Preferably, the coupling agent is at least one of gamma-aminopropyltriethoxysilane, 3- (2, 3-glycidoxy) propyltrimethoxysilane and gamma- (methacryloyloxy) propyltrimethoxysilane.
Preferably, the corrosion inhibitor is at least one of quinoline, 8-hydroxyquinoline and 5, 6-benzoquinoline.
Preferably, the reinforcing fiber is at least one of glass fiber, polypropylene fiber and aramid fiber.
In the step (1), preparing the air-entrained aluminum powder into water dispersion, promoting dispersion by adopting nonionic coco glucoside, lauryl glucoside or cetearyl glucoside, adding a quinoline corrosion inhibitor to prevent the aluminum powder from reacting with water, and performing ultrasonic dispersion for more than 20min to obtain the aluminum powder dispersion with uniform dispersion and stable property. Preferably, in the step (1), the mass ratio of the aerated aluminum powder, the dispersing agent, the coupling agent, the corrosion inhibitor and the water is 20-40: 0.5-1: 0.5-1: 0.2-0.5: 100.
in the step (2) and the step (3), the aluminum powder dispersion liquid is atomized by a pressure sprayer and then respectively deposited on the surfaces of the nano-scale silicon dioxide particles and the micro-scale silicon dioxide particles, and an aluminum powder coating layer is formed on the surface of the silicon dioxide. Preferably, in the step (2), the mass ratio of the aluminum powder dispersion liquid to the nano-scale silica particles is 1: 1 to 1.2. Preferably, in the step (3), the mass ratio of the aluminum powder dispersion to the micron-sized silica particles is 1: 1.3 to 1.5.
In the step (4), the aluminum powder coated nano silicon dioxide, the aluminum powder coated micro silicon dioxide and preheated water are mixed to obtain a mixed suspension which cannot be stored for a long time and must be prepared for use at present, and the mixing process is preferably carried out at a low speed, and the stirring speed is controlled to be 40-60 r/min. Preferably, in the step (4), the mass ratio of the aluminum powder coated nano silicon dioxide to the aluminum powder coated micro silicon dioxide to the water is 12-15: 25-30: 100.
in the step (5), preparing the slurry by adopting a graded mixing mode, fully mixing cement, fly ash, quicklime, quartz sand, gypsum and reinforcing fiber, and then adding the mixed suspension for mixing to uniformly disperse the aluminum powder coated nano silicon dioxide and the aluminum powder coated micron silicon dioxide in the slurry. And (3) strictly controlling the mixing time within 20-30 s after the mixed suspension is added, and immediately pouring the obtained slurry into a mould for gas forming. Preferably, in the step (5), the mass ratio of cement, fly ash, quicklime, quartz sand, gypsum, reinforcing fiber, water and mixed suspension is 13-15: 55-65: 12-14: 8-10: 1-3: 0.2-0.5: 48-52: 3 to 4.
And (6) the concrete gas forming process. Due to the existence of cement and lime in the raw materials, the slurry formed after adding water is alkaline, so that aluminum powder and OH-And reacting to generate hydrogen, so that a large amount of porous structures are formed in the concrete. In the process of gradual reaction of the aluminum powder, the nano silicon dioxide and the micron silicon dioxide coated in the aluminum powder are gradually released, diffused along with gas and finally attached to the hole wall of the porous structure, so that a rough surface constructed by the nano silicon dioxide and the micron silicon dioxide is formed on the hole wall, and the micro-nano rough surface has good super-hydrophobic property. The gas causes the volume expansion of the concrete, and the adding depth of the slurry is about 2/3 of the depth of the mould. Due to the volume expansion rate in the middle and around the concreteIn contrast, the bread ends need to be cut off during the process of sending out the air.
The step (7) is an autoclaved curing process, wherein the steam pressure is 2-3 MPa, and the temperature is preferably 200-220 ℃.
Treating the surface of the concrete block in the step (8), spraying dimethyl silicone oil with low surface energy, constructing a micro-nano rough surface by using nano silicon dioxide and micro silicon dioxide, and endowing the outer surface of the concrete block with super-hydrophobic property, wherein the spraying amount is 30-50 g/m2And (4) finishing. Preferably, in the step (8), the mass ratio of the nano-scale silica particles to the micro-scale silica particles to the dispersant to the dimethyl silicone oil to water is 1: 1.5-2.5: 0.01-0.03: 5-10: 20 to 30.
The invention also provides the aerated concrete with heat insulation and low hygroscopicity for the energy-saving building, which is prepared by the method. The aerated concrete has low hygroscopicity, can absorb little moisture in a high-humidity environment, and can prevent the heat insulation effect from being greatly reduced. The outer surface of the aerated concrete has the super-hydrophobic layer with low surface energy, and external moisture can be prevented from invading the interior of the concrete. However, in the construction or long-term use process, the hydrophobic layer on the surface of the concrete block may be damaged for various reasons, and the micro or nano silica may fall off, resulting in the incomplete surface layer, thereby failing to effectively prevent the water from invading into the concrete. The nano silicon dioxide and the micron silicon dioxide are coated by the aluminum powder creatively, and in the process of generating hydrogen by the reaction of the aluminum powder, the nano silicon dioxide and the micron silicon dioxide are released gradually and diffuse along with the hydrogen, and finally are attached to the wall of a pore channel in the aerated concrete to form a super-hydrophobic micro-nano rough surface. The super-hydrophobicity of the inner pore channel wall can greatly reduce the invasion and diffusion of moisture in the concrete, and particularly, when a hydrophobic layer on the surface of a concrete block is damaged, the moisture penetrating through the surface layer can be prevented from continuously diffusing in the concrete through a porous structure. Therefore, under the combined action of the super-hydrophobic outer surface of the concrete block and the super-hydrophobic inner pore channel wall, the obtained aerated concrete has low hygroscopicity, can resist moisture invasion in a high-humidity environment, keeps a low heat conductivity coefficient, and prevents the heat insulation effect from being greatly reduced.
The invention provides a heat-insulating and low-hygroscopicity aerated concrete for energy-saving buildings and a preparation method thereof, and compared with the prior art, the aerated concrete has the outstanding characteristics and excellent effects that: the outer surface of the aerated concrete block prepared by the invention is provided with the super-hydrophobic layer with low surface energy, so that external moisture can be prevented from invading the interior of concrete; the surface of the inner pore channel wall also has super-hydrophobicity, so that the invasion and diffusion of water in the concrete can be greatly reduced. Under the combined action of the super-hydrophobic outer surface of the concrete block and the super-hydrophobic inner pore channel wall, the obtained aerated concrete has low hygroscopicity, can resist moisture invasion in a high-humidity environment, keeps a low heat conductivity coefficient, and prevents the heat insulation effect from being greatly reduced.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) Adding air-entraining aluminum powder, a dispersing agent, a coupling agent and a corrosion inhibitor into water, and uniformly dispersing by ultrasonic to obtain an aluminum powder dispersion liquid; the mass ratio of the aerated aluminum powder, the dispersing agent, the coupling agent, the corrosion inhibitor and the water is 30: 0.5: 1: 0.2: 100, respectively;
(2) spraying and depositing the aluminum powder dispersion liquid on the surface of the nano-scale silicon dioxide particles to obtain aluminum powder coated nano-silica; the mass ratio of the aluminum powder dispersion liquid to the nano-scale silicon dioxide particles is 1: 1;
(3) spraying and depositing the aluminum powder dispersion liquid on the surfaces of the micron-sized silicon dioxide particles to obtain aluminum powder coated micron-sized silicon dioxide; the mass ratio of the aluminum powder dispersion liquid to the micron-sized silicon dioxide particles is 1: 1.5;
(4) uniformly mixing aluminum powder coated nano silicon dioxide, aluminum powder coated micro silicon dioxide and water at 50 ℃ to obtain a mixed suspension; the mass ratio of the aluminum powder coated nano silicon dioxide to the aluminum powder coated micron silicon dioxide to the water is 12: 30: 100, respectively;
(5) adding cement, fly ash, quicklime, quartz sand, gypsum and reinforced fibers into a stirrer, stirring for 5min, then adding water with the temperature of 50 ℃, continuously stirring for 3min, then adding the mixed suspension, and continuously stirring for 20s to obtain slurry; the mass ratio of cement, fly ash, quicklime, quartz sand, gypsum, reinforced fiber, water and mixed suspension is 13: 55: 14: 10: 1: 0.5: 52: 3;
(6) pouring the slurry into a mold coated with demolding oil, adding the slurry to a depth of about 2/3 of the depth of the mold, standing in a constant-temperature drying oven at 50 ℃ for 4h, cutting off the bread head, and continuously standing for 8 h;
(7) removing the mold, and then placing the concrete block in a high-pressure steam box with the temperature of 220 ℃ and the pressure of 2MPa for curing for 48 hours;
(8) adding the nano-scale silicon dioxide particles, the micron-scale silicon dioxide particles, the dispersing agent and the dimethyl silicone oil into water, uniformly dispersing, and spraying on each surface of the concrete block, wherein the spraying amount is 40g/m2Drying to obtain the aerated concrete with heat insulation and low hygroscopicity; the mass ratio of the nano-scale silicon dioxide particles to the micron-scale silicon dioxide particles to the dispersing agent to the dimethyl silicone oil to the water is 1: 1.5: 0.03: 5: 30.
the cement is made of 42.5 parts of ordinary portland cement, the dispersant is coco-glucoside, the coupling agent is gamma-aminopropyl triethoxysilane, the corrosion inhibitor is quinoline, and the reinforcing fiber is aramid fiber.
Example 2
(1) Adding air-entraining aluminum powder, a dispersing agent, a coupling agent and a corrosion inhibitor into water, and uniformly dispersing by ultrasonic to obtain an aluminum powder dispersion liquid; the mass ratio of the aerated aluminum powder, the dispersing agent, the coupling agent, the corrosion inhibitor and the water is 40: 0.5: 0.5: 0.3: 100, respectively;
(2) spraying and depositing the aluminum powder dispersion liquid on the surface of the nano-scale silicon dioxide particles to obtain aluminum powder coated nano-silica; the mass ratio of the aluminum powder dispersion liquid to the nano-scale silicon dioxide particles is 1: 1.2;
(3) spraying and depositing the aluminum powder dispersion liquid on the surfaces of the micron-sized silicon dioxide particles to obtain aluminum powder coated micron-sized silicon dioxide; the mass ratio of the aluminum powder dispersion liquid to the micron-sized silicon dioxide particles is 1: 1.5;
(4) uniformly mixing aluminum powder coated nano silicon dioxide, aluminum powder coated micro silicon dioxide and water at 50 ℃ to obtain a mixed suspension; the mass ratio of the aluminum powder coated nano silicon dioxide to the aluminum powder coated micron silicon dioxide to the water is 15: 25: 100, respectively;
(5) adding cement, fly ash, quicklime, quartz sand, gypsum and reinforced fibers into a stirrer, stirring for 6min, then adding water with the temperature of 50 ℃, continuously stirring for 3min, then adding the mixed suspension, and continuously stirring for 25s to obtain slurry; the mass ratio of cement, fly ash, quicklime, quartz sand, gypsum, reinforced fiber, water and mixed suspension is 14: 60: 12: 10: 1: 0.4: 50: 4;
(6) pouring the slurry into a mold coated with demolding oil, adding the slurry to a depth of about 2/3 of the depth of the mold, standing for 5h in a constant-temperature drying oven at 50 ℃, cutting off the bread ends, and continuing to stand for 5 h;
(7) removing the mold, and then placing the concrete block in a high-pressure steam box with the temperature of 200 ℃ and the pressure of 3MPa for curing for 24 hours;
(8) adding the nano-scale silicon dioxide particles, the micron-scale silicon dioxide particles, the dispersing agent and the dimethyl silicone oil into water, uniformly dispersing, and spraying on each surface of the concrete block, wherein the spraying amount is 40g/m2Drying to obtain the aerated concrete with heat insulation and low hygroscopicity; the mass ratio of the nano-scale silicon dioxide particles to the micron-scale silicon dioxide particles to the dispersing agent to the dimethyl silicone oil to the water is 1: 2: 0.02: 8: 25.
the cement is made of ordinary Portland cement 42.5, dispersant is lauryl glucoside, coupling agent is 3- (2, 3-epoxypropoxy) propyl trimethoxy silane, corrosion inhibitor is 8-hydroxyquinoline, and reinforcing fiber is polypropylene fiber.
Example 3
(1) Adding air-entraining aluminum powder, a dispersing agent, a coupling agent and a corrosion inhibitor into water, and uniformly dispersing by ultrasonic to obtain an aluminum powder dispersion liquid; the mass ratio of the aerated aluminum powder, the dispersing agent, the coupling agent, the corrosion inhibitor and the water is 20: 0.5: 1: 0.5: 100, respectively;
(2) spraying and depositing the aluminum powder dispersion liquid on the surface of the nano-scale silicon dioxide particles to obtain aluminum powder coated nano-silica; the mass ratio of the aluminum powder dispersion liquid to the nano-scale silicon dioxide particles is 1: 1.1;
(3) spraying and depositing the aluminum powder dispersion liquid on the surfaces of the micron-sized silicon dioxide particles to obtain aluminum powder coated micron-sized silicon dioxide; the mass ratio of the aluminum powder dispersion liquid to the micron-sized silicon dioxide particles is 1: 1.4;
(4) uniformly mixing aluminum powder coated nano silicon dioxide, aluminum powder coated micro silicon dioxide and water at 50 ℃ to obtain a mixed suspension; the mass ratio of the aluminum powder coated with the nano silicon dioxide to the aluminum powder coated with the micron silicon dioxide to the water is 13: 28: 100, respectively;
(5) adding cement, fly ash, quicklime, quartz sand, gypsum and reinforced fibers into a stirrer, stirring for 10min, then adding water with the temperature of 50 ℃, continuously stirring for 2min, then adding the mixed suspension, and continuously stirring for 20s to obtain slurry; the mass ratio of cement, fly ash, quicklime, quartz sand, gypsum, reinforced fiber, water and mixed suspension is 13: 58: 13: 9: 2: 0.3: 50: 4;
(6) pouring the slurry into a mold coated with demolding oil, adding the slurry to a depth of about 2/3 of the depth of the mold, standing in a constant-temperature drying oven at 50 ℃ for 4h, cutting off the bread head, and continuously standing for 6 h;
(7) removing the mold, and then placing the concrete block in a high-pressure steam box with the temperature of 210 ℃ and the pressure of 2.5MPa for curing for 36 hours;
(8) adding the nano-scale silicon dioxide particles, the micron-scale silicon dioxide particles, the dispersing agent and the dimethyl silicone oil into water, uniformly dispersing, and spraying on each surface of the concrete block, wherein the spraying amount is 50g/m2Drying to obtain the aerated concrete with heat insulation and low hygroscopicity; the mass ratio of the nano-scale silicon dioxide particles to the micron-scale silicon dioxide particles to the dispersing agent to the dimethyl silicone oil to the water is 1: 1.8: 0.01: 7: 28.
the cement is made of ordinary Portland cement 42.5, dispersing agent is cetearyl glucoside, coupling agent is gamma- (methacryloyloxy) propyl trimethoxy silane, corrosion inhibitor is 5, 6-benzoquinoline, and reinforcing fiber is glass fiber.
Example 4
(1) Adding air-entraining aluminum powder, a dispersing agent, a coupling agent and a corrosion inhibitor into water, and uniformly dispersing by ultrasonic to obtain an aluminum powder dispersion liquid; the mass ratio of the aerated aluminum powder, the dispersing agent, the coupling agent, the corrosion inhibitor and the water is 35: 0.8: 0.8: 0.4: 100, respectively;
(2) spraying and depositing the aluminum powder dispersion liquid on the surface of the nano-scale silicon dioxide particles to obtain aluminum powder coated nano-silica; the mass ratio of the aluminum powder dispersion liquid to the nano-scale silicon dioxide particles is 1: 1;
(3) spraying and depositing the aluminum powder dispersion liquid on the surfaces of the micron-sized silicon dioxide particles to obtain aluminum powder coated micron-sized silicon dioxide; the mass ratio of the aluminum powder dispersion liquid to the micron-sized silicon dioxide particles is 1: 1.5;
(4) uniformly mixing aluminum powder coated nano silicon dioxide, aluminum powder coated micro silicon dioxide and water at 50 ℃ to obtain a mixed suspension; the mass ratio of the aluminum powder coated nano silicon dioxide to the aluminum powder coated micron silicon dioxide to the water is 14: 27: 100, respectively;
(5) adding cement, fly ash, quicklime, quartz sand, gypsum and reinforced fibers into a stirrer, stirring for 8min, then adding water with the temperature of 50 ℃, continuously stirring for 3min, then adding the mixed suspension, and continuously stirring for 30s to obtain slurry; the mass ratio of cement, fly ash, quicklime, quartz sand, gypsum, reinforced fiber, water and mixed suspension is 13: 62: 12: 8: 1: 0.5: 48: 3.5;
(6) pouring the slurry into a mold coated with demolding oil, adding the slurry to a depth of about 2/3 of the depth of the mold, standing in a constant-temperature drying oven at 50 ℃ for 4h, cutting off the bread head, and continuing to stand for 7 h;
(7) removing the mold, and then placing the concrete block in a high-pressure steam box at 220 ℃ and 3MPa for curing for 24 hours;
(8) adding the nano-scale silicon dioxide particles, the micron-scale silicon dioxide particles, the dispersing agent and the dimethyl silicone oil into water, uniformly dispersing, and spraying on each surface of the concrete block by a spraying amountIs 30g/m2Drying to obtain the aerated concrete with heat insulation and low hygroscopicity; the mass ratio of the nano-scale silicon dioxide particles to the micron-scale silicon dioxide particles to the dispersing agent to the dimethyl silicone oil to the water is 1: 2.2: 0.02: 6: 22.
the cement is made of 42.5 parts of ordinary portland cement, the dispersing agent is cetearyl glucoside, the coupling agent is gamma-aminopropyl triethoxysilane, the corrosion inhibitor is 8-hydroxyquinoline, and the reinforcing fiber is aramid fiber.
Example 5
(1) Adding air-entraining aluminum powder, a dispersing agent, a coupling agent and a corrosion inhibitor into water, and uniformly dispersing by ultrasonic to obtain an aluminum powder dispersion liquid; the mass ratio of the aerated aluminum powder, the dispersing agent, the coupling agent, the corrosion inhibitor and the water is 25: 0.6: 0.8: 0.3: 100, respectively;
(2) spraying and depositing the aluminum powder dispersion liquid on the surface of the nano-scale silicon dioxide particles to obtain aluminum powder coated nano-silica; the mass ratio of the aluminum powder dispersion liquid to the nano-scale silicon dioxide particles is 1: 1.2;
(3) spraying and depositing the aluminum powder dispersion liquid on the surfaces of the micron-sized silicon dioxide particles to obtain aluminum powder coated micron-sized silicon dioxide; the mass ratio of the aluminum powder dispersion liquid to the micron-sized silicon dioxide particles is 1: 1.4;
(4) uniformly mixing aluminum powder coated nano silicon dioxide, aluminum powder coated micro silicon dioxide and water at 50 ℃ to obtain a mixed suspension; the mass ratio of the aluminum powder coated nano silicon dioxide to the aluminum powder coated micron silicon dioxide to the water is 12: 27: 100, respectively;
(5) adding cement, fly ash, quicklime, quartz sand, gypsum and reinforced fibers into a stirrer, stirring for 6min, then adding water with the temperature of 50 ℃, continuously stirring for 3min, then adding the mixed suspension, and continuously stirring for 25s to obtain slurry; the mass ratio of cement, fly ash, quicklime, quartz sand, gypsum, reinforced fiber, water and mixed suspension is 14: 58: 13: 9: 1: 0.5: 50: 3;
(6) pouring the slurry into a mold coated with demolding oil, adding the slurry to a depth of about 2/3 of the depth of the mold, standing in a constant-temperature drying oven at 50 ℃ for 4.5h, cutting off the bread head, and continuously standing for 6 h;
(7) removing the mold, and then placing the concrete block in a high-pressure steam box with the temperature of 210 ℃ and the pressure of 2.5MPa for curing for 36 hours;
(8) adding the nano-scale silicon dioxide particles, the micron-scale silicon dioxide particles, the dispersing agent and the dimethyl silicone oil into water, uniformly dispersing, and spraying on each surface of the concrete block, wherein the spraying amount is 40g/m2Drying to obtain the aerated concrete with heat insulation and low hygroscopicity; the mass ratio of the nano-scale silicon dioxide particles to the micron-scale silicon dioxide particles to the dispersing agent to the dimethyl silicone oil to the water is 1: 2: 0.02: 7: 26.
the cement is 42.5 of ordinary portland cement, the dispersant is coco-glucoside, the coupling agent is 3- (2, 3-epoxypropoxy) propyl trimethoxy silane, the corrosion inhibitor is quinoline, and the reinforcing fiber is polypropylene fiber.
Comparative example 1
In the preparation process, the surface of the concrete block is not sprayed, and other preparation conditions are consistent with those of example 5.
Comparative example 2
In the preparation process, the surface of the concrete block is not sprayed, aluminum powder is directly used, nano silicon dioxide and micro silicon dioxide are not coated in the aluminum powder, and other preparation conditions are consistent with those of the embodiment 5.
And (3) performance testing: placing the aerated concrete blocks prepared in the embodiment 5 and the comparative examples 1 and 2 in an environment of 20 ℃, setting the relative humidity to be 30%, and testing the heat conductivity coefficient of the concrete after 48 hours; setting the relative humidity to be 70%, and testing the heat conductivity coefficient of the concrete after 48 hours; setting the relative humidity to be 90%, and testing the heat conductivity coefficient of the concrete after 48 hours; and finally, setting the relative humidity to be 100%, and testing the heat conductivity coefficient of the concrete after 48 hours. The data obtained are shown in Table 1.
Table 1:
Figure DEST_PATH_IMAGE002

Claims (9)

1. the preparation method of the aerated concrete with heat insulation, heat preservation and low hygroscopicity for the energy-saving building is characterized by comprising the following specific steps:
(1) adding air-entraining aluminum powder, a dispersing agent, a coupling agent and a corrosion inhibitor into water, and uniformly dispersing by ultrasonic to obtain an aluminum powder dispersion liquid;
(2) spraying and depositing the aluminum powder dispersion liquid on the surface of the nano-scale silicon dioxide particles to obtain aluminum powder coated nano-silica;
(3) spraying and depositing the aluminum powder dispersion liquid on the surfaces of the micron-sized silicon dioxide particles to obtain aluminum powder coated micron-sized silicon dioxide;
(4) uniformly mixing aluminum powder coated nano silicon dioxide, aluminum powder coated micro silicon dioxide and water at 50 ℃ to obtain a mixed suspension;
(5) adding cement, fly ash, quicklime, quartz sand, gypsum and reinforcing fibers into a stirrer, stirring for 3-10 min, then adding water at 50 ℃, continuously stirring for 2-3 min, then adding mixed suspension, and continuously stirring for 20-30 s to obtain slurry;
(6) pouring the slurry into a mold coated with demolding oil, standing for 4-5 hours in a constant-temperature drying oven at 50 ℃, then cutting off the bread ends, and continuing to stand for 4-8 hours;
(7) removing the mold, and then placing the concrete block in a high-pressure steam box at the temperature of 200-220 ℃ for curing for 24-48 h;
(8) adding the nano-scale silicon dioxide particles, the micron-scale silicon dioxide particles, the dispersing agent and the dimethyl silicone oil into water, uniformly dispersing, spraying the mixture on each surface of the concrete block, and drying to obtain the aerated concrete with heat insulation and low hygroscopicity.
2. The preparation method of the heat-insulating, low-hygroscopicity aerated concrete for the energy-saving building according to claim 1, wherein the preparation method comprises the following steps:
the dispersant is at least one of coco glucoside, lauryl glucoside and cetearyl glucoside;
the coupling agent is at least one of gamma-aminopropyltriethoxysilane, 3- (2, 3-epoxypropoxy) propyltrimethoxysilane and gamma- (methacryloyloxy) propyltrimethoxysilane;
the corrosion inhibitor is at least one of quinoline, 8-hydroxyquinoline and 5, 6-benzoquinoline;
the reinforced fiber is at least one of glass fiber, polypropylene fiber and aramid fiber.
3. The preparation method of the heat-insulating, low-hygroscopicity aerated concrete for the energy-saving building according to claim 1, wherein the preparation method comprises the following steps: in the step (1), the mass ratio of the aerated aluminum powder, the dispersing agent, the coupling agent, the corrosion inhibitor and the water is 20-40: 0.5-1: 0.5-1: 0.2-0.5: 100.
4. the preparation method of the heat-insulating, low-hygroscopicity aerated concrete for the energy-saving building according to claim 1, wherein the preparation method comprises the following steps: in the step (2), the mass ratio of the aluminum powder dispersion liquid to the nano-scale silicon dioxide particles is 1: 1 to 1.2.
5. The preparation method of the heat-insulating, low-hygroscopicity aerated concrete for the energy-saving building according to claim 1, wherein the preparation method comprises the following steps: in the step (3), the mass ratio of the aluminum powder dispersion liquid to the micron-sized silicon dioxide particles is 1: 1.3 to 1.5.
6. The preparation method of the heat-insulating, low-hygroscopicity aerated concrete for the energy-saving building according to claim 1, wherein the preparation method comprises the following steps: in the step (4), the mass ratio of the aluminum powder coated nano silicon dioxide to the aluminum powder coated micro silicon dioxide to the water is 12-15: 25-30: 100.
7. the preparation method of the heat-insulating, low-hygroscopicity aerated concrete for the energy-saving building according to claim 1, wherein the preparation method comprises the following steps: in the step (5), the mass ratio of cement, fly ash, quicklime, quartz sand, gypsum, reinforced fibers, water and mixed turbid liquid is 13-15: 55-65: 12-14: 8-10: 1-3: 0.2-0.5: 48-52: 3 to 4.
8. The preparation method of the heat-insulating, low-hygroscopicity aerated concrete for the energy-saving building according to claim 1, wherein the preparation method comprises the following steps: in the step (8), the mass ratio of the nano-scale silicon dioxide particles to the micro-scale silicon dioxide particles to the dispersing agent to the dimethyl silicone oil to the water is 1: 1.5-2.5: 0.01-0.03: 5-10: 20 to 30.
9. The aerated concrete with heat insulation and low moisture absorption for the energy-saving building, prepared by the preparation method of any one of claims 1 to 8.
CN202010188405.8A 2020-03-17 2020-03-17 Heat-insulating and low-hygroscopicity aerated concrete for energy-saving building and preparation method thereof Withdrawn CN111170701A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114671706A (en) * 2022-05-13 2022-06-28 郑州工大建材有限公司 Thermal insulation coating based on inorganic plasticized microporous particulate material and application

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114671706A (en) * 2022-05-13 2022-06-28 郑州工大建材有限公司 Thermal insulation coating based on inorganic plasticized microporous particulate material and application

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