CN114772990A - Heat storage type ground heating backfill cushion layer and preparation method and application thereof - Google Patents
Heat storage type ground heating backfill cushion layer and preparation method and application thereof Download PDFInfo
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- CN114772990A CN114772990A CN202210566404.1A CN202210566404A CN114772990A CN 114772990 A CN114772990 A CN 114772990A CN 202210566404 A CN202210566404 A CN 202210566404A CN 114772990 A CN114772990 A CN 114772990A
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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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/12—Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
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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
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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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F2290/00—Specially adapted covering, lining or flooring elements not otherwise provided for
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Abstract
The invention relates to the technical field of ground heating backfill, in particular to a heat storage type ground heating backfill cushion layer and application thereof; the heat storage type ground heating backfill cushion comprises the following components in parts by weight: 30-60 parts of fine stone concrete, 30-60 parts of graphite tailing sand, 2-6 parts of an expanding agent and 2-6 parts of a combined additive; the expanding agent is an animal protein compound foaming agent, and the combined additive comprises redispersible rubber powder, polyvinyl alcohol and hydroxypropyl methyl cellulose in parts by weight; according to the invention, the solid waste graphite tailing sand in graphite development is added into the ground heating backfill cushion layer, so that the heat storage coefficient of the ground heating backfill cushion layer can be improved, and the characteristics of small specific gravity and high compressive strength of the ground heating backfill cushion layer can not be influenced; according to the invention, the floor heating backfill cushion has good fluidity and excellent mechanical property by selecting the expanding agent and the combined additive.
Description
Technical Field
The invention relates to the technical field of ground heating backfill, in particular to a heat storage type ground heating backfill cushion layer and a preparation method and application thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The floor heating can be divided into a wet type and a dry type according to different paving structures, and the main difference between the wet type and the dry type lies in whether backfilling is needed. The wet floor heating needs to be backfilled, and the backfilling layer has the main functions of heat storage, heat uniformity and floor heating pipe protection in the whole floor heating. The ground heating backfill is a backfill layer of a ground heating system and can also be called a heat storage layer. Ground heating backfill can protect ground heating pipes on one hand, and on the other hand, heat storage effect is also achieved, so that the service efficiency of ground heating is higher. The floor heating backfill layer in the prior art is made of C20 pea concrete generally, but the heat storage effect is poor.
Graphite is an inorganic non-metallic material, has wide application in the fields of lubrication, wear resistance, corrosion, electric conduction, energy storage and the like, and is an essential key material in the industries of national defense, aerospace, machinery and the like. The production of each ton of graphite produces over 100 tons of waste water and tailings. The large accumulation of the graphite tailings occupies farmland, reduces land utilization rate, has small particle size, easily causes sand raising phenomenon, and seriously damages ecological environment. At present, the application range of graphite tailings is narrower, and most of graphite tailings are used for burying subgrade foundations. A large amount of graphite tailings also cause the problems of land occupation and safety, become a main factor for restricting the sustainable development of graphite enterprises, and are very important for resource utilization of the graphite tailings. But the research on the prior art is still less on how to apply the graphite tailings to the floor heating backfill layer.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a heat storage type ground heating backfill cushion layer and a preparation method and application thereof.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
in a first aspect of the invention, the invention provides a heat storage type ground heating backfill cushion layer, which comprises the following components in parts by weight: 30-60 parts of fine aggregate concrete, 30-60 parts of graphite tailing sand, 2-6 parts of an expanding agent and 2-6 parts of a combined additive;
in a second aspect of the present invention, the present invention provides a method for preparing the heat storage type ground heating backfill cushion layer in the first aspect, and the preparation method includes the following steps:
(1) mixing the expanding agent with water, and then foaming by using a high-speed foaming machine;
(2) adding water into the fine aggregate concrete and the graphite tailing sand, pre-stirring to prepare uniform slurry, then adding the combined additive and the expanding agent prepared in the step (1), uniformly stirring, and then casting and molding.
In a third aspect of the invention, the invention provides an application of the heat storage type ground heating backfill cushion layer in the first aspect in ground heating.
The specific embodiment of the invention has the following beneficial effects:
according to the invention, the solid waste graphite tailing sand in graphite development is added into the ground heating backfill cushion layer, so that the heat storage coefficient of the ground heating backfill cushion layer can be improved, and the characteristics of small specific gravity and high compressive strength of the ground heating backfill cushion layer can not be influenced;
according to the invention, the floor heating backfill cushion has good fluidity and excellent mechanical property by selecting the expanding agent and the combined additive.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As discussed in the background art, the ground heating backfill cushion layer in the prior art has the technical problems of low heat storage value and the like, and on the basis, the invention provides the heat storage type ground heating backfill cushion layer.
Floor heating known in the prior art has three layers: the bottom layer is made of microporous concrete and has the requirements on sound insulation and heat preservation; in addition, the compressive strength and the low water absorption and flowability should be met; the lightweight backfill mat should have the following characteristics: the first is fluidity, the second is heat storage capacity, and the third is small specific gravity; the surface layer should have the properties: the material has good fluidity, lightens as much as possible under the condition of meeting the strength, and has fine, smooth, wear-resistant and flat surface. The invention provides a light backfill cushion layer.
The invention provides a heat storage type ground heating backfill cushion layer, which comprises the following components in parts by weight: 30-60 parts of fine aggregate concrete, 30-60 parts of graphite tailing sand, 2-6 parts of an expanding agent and 2-6 parts of a combined additive;
in a specific embodiment, the heat storage type ground heating backfill cushion comprises the following components in parts by weight: 30-60 parts of fine aggregate concrete, 30-50 parts of graphite tailing sand, 2-6 parts of an expanding agent and 2-6 parts of a combined additive;
in a specific embodiment, the heat storage type ground heating backfill cushion comprises the following components in parts by weight: 30-60 parts of fine aggregate concrete, 40-60 parts of graphite tailing sand, 2-6 parts of an expanding agent and 2-6 parts of a combined additive;
the graphite tailings are in a micro-fine powder shape, are yellow brown and have a soil-like luster; the content of fixed carbon is 20-30%, the components are siliceous raw materials, and graphite tailings contain quartz, mica group minerals, potash feldspar, calcite, chlorite and amphibole; the graphite tailing particles are fine and easy to disperse.
The fine aggregate concrete is concrete with the maximum grain diameter of coarse aggregate not more than 15 mm.
In a specific embodiment, the animal protein compound foaming agent is selected as the expanding agent; further, the preparation method of the animal protein compound foaming agent comprises the following steps:
(1) mixing pig trotter, sodium bisulfite, thiourea, urea and water, adjusting the pH value to 5.5, hydrolyzing at 70-80 ℃, quickly transferring to a water bath after the reaction is finished, cooling to normal temperature, centrifuging, and filtering to obtain a filtrate, namely the animal protein foaming agent mother liquor;
(2) and adding fatty alcohol-polyoxyethylene ether sodium sulfate, sodium dodecyl benzene sulfonate, tea saponin, phospholipid and gelatin into the prepared animal protein foaming agent mother liquor, heating to 40-50 ℃, uniformly stirring, and cooling to normal temperature after the raw materials are fully dissolved to obtain the compound animal protein foaming agent.
In the application, the animal protein composite foaming agent known in the prior art can also be selected from animal protein foaming agents with high foaming times and strong stability.
The animal protein type foaming agent has good foaming performance and stability, rich raw materials and environmental friendliness, and is a high-quality and high-grade foaming agent; the animal protein foaming agent mainly comprises three categories of hydrolyzed animal hoof and horn, hydrolyzed animal hair and hydrolyzed blood glue. The foaming principle of protein foaming agents is the degradation of proteins. The peptide bonds in the protein macromolecules are broken to generate easily soluble protein micromolecules, and with the increase of the protein micromolecules in the solution, the hydrophobic groups are gradually increased, so that the surface tension is reduced, and an interface is formed. In addition, because hydrogen bonds can be formed among special groups in molecules, strong hydrogen bond action can ensure that the solution forms a foam liquid film with higher strength, thereby leading the foaming agent to generate stable foam.
In a specific embodiment, the combined additive comprises redispersible rubber powder, polyvinyl alcohol and hydroxypropyl methylcellulose;
preferably, the weight ratio of the redispersible rubber powder, the polyvinyl alcohol and the hydroxypropyl methylcellulose is 8: 1-2: 1-2;
preferably, the redispersible rubber powder is selected from one or more of the following rubber powders: vinyl acetate and ethylene copolymerized rubber powder (Vac/E), vinyl acetate and higher fatty acid vinyl ester copolymerized rubber powder (Vac/VeoVa), acrylic ester and styrene copolymerized rubber powder (A/S), vinyl acetate homopolymerized rubber powder (PVac) and styrene and butadiene copolymerized rubber powder (SBR).
Hydroxypropyl methylcellulose belongs to one of nonionic cellulose mixed ethers, is a semi-synthetic, inactive and viscoelastic polymer, and can be used as a water-retaining agent and a retarder of cement mortar in the construction industry to make the mortar have pumpability. The coating mortar, the gypsum material, the putty powder or other building materials are used as an adhesive to improve the coating property and prolong the operable time. The water-retaining property of the cement paste can ensure that the paste does not crack due to too fast drying after being coated and the strength after hardening is enhanced.
Polyvinyl alcohol is an important chemical raw material, and is used for manufacturing polyvinyl acetal, gasoline-resistant pipelines, vinylon, fabric treating agents, emulsifiers, paper coatings, adhesives, glue and the like.
According to the invention, the redispersible rubber powder is matched with the polyvinyl alcohol and the hydroxypropyl methyl cellulose, so that the ground heating backfill cushion layer has good fluidity and excellent mechanical properties.
In an embodiment of the invention, the invention provides a preparation method of the heat storage type ground heating backfill cushion layer, which comprises the following steps:
(1) mixing an expanding agent, namely an animal protein compound type foaming agent and water, and then foaming by using a high-speed foaming machine;
(2) adding water into the fine aggregate concrete and the graphite tailing sand, pre-stirring to prepare uniform slurry, then adding the combined additive and the expanding agent prepared in the step (1), uniformly stirring, and then casting and molding.
Preferably, the animal protein compound foaming agent and the water are mixed according to the weight ratio of 1: mixing at a ratio of 40-50;
preferably, the rotating speed of the stirring blade during bubble making is 700-800 revolutions per minute; the foam making time is 3-5 minutes until no large foam exists in the foam, the foam particles are fine and uniform, and the foam volume is not increased any more.
In an embodiment of the invention, the invention provides an application of the heat storage type ground heating backfill cushion layer in ground heating.
The present invention will be further described with reference to specific examples.
Example 1
The heat storage type ground heating backfill cushion comprises the following components in parts by weight: fine aggregate concrete 40, graphite tailing sand 40, an expanding agent 4 and a combined additive 4;
the preparation method of the heat storage type ground heating backfill cushion layer comprises the following steps:
(1) firstly, preparing a compound animal protein foaming agent: mixing 8 parts of pig nail, 3 parts of sodium bisulfite, 2 parts of thiourea, 6 parts of urea and 120 parts of water, adjusting the pH value to 5.5, hydrolyzing at 75 ℃ for 6 hours, quickly transferring to a water bath after the reaction is finished, cooling to normal temperature, centrifuging, and filtering to obtain a filtrate, namely the animal protein foaming agent mother solution; and adding 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 3 parts of sodium dodecyl benzene sulfonate, 2 parts of tea saponin, 1.5 parts of phospholipid and 2 parts of gelatin into the prepared animal protein foaming agent mother liquor, heating to 45 ℃, uniformly stirring, and cooling to normal temperature after the raw materials are fully dissolved to obtain the compound animal protein foaming agent.
(2) Mixing an animal protein compound type foaming agent and water according to the ratio of 1: 40, and then foaming by using a high-speed foaming machine for 4 minutes until no large bubbles exist in the foam, the foam particles are fine and uniform, and the foam volume is not increased any more.
(3) Adding water into fine aggregate concrete and graphite tailing sand, pre-stirring to prepare uniform slurry, adding a combined additive (the combined additive comprises 8 parts of redispersible rubber powder, 1 part of polyvinyl alcohol and 1 part of hydroxypropyl methyl cellulose) and the compound animal protein foaming agent prepared in the step (1), uniformly stirring, and then casting and molding.
Example 2
The heat storage type ground heating backfill cushion layer comprises the following components in parts by weight: 50 parts of fine aggregate concrete, 40 parts of graphite tailing sand, 5 parts of an expanding agent and 4 parts of a combined additive;
(1) firstly, preparing a compound animal protein foaming agent: mixing 8 parts of pig nail, 3 parts of sodium bisulfite, 2 parts of thiourea, 6 parts of urea and 120 parts of water, adjusting the pH value to 5.5, hydrolyzing at 75 ℃ for 6 hours, quickly transferring to a water bath after the reaction is finished, cooling to normal temperature, centrifuging, and filtering to obtain a filtrate, namely the animal protein foaming agent mother solution; and adding 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 3 parts of sodium dodecyl benzene sulfonate, 2 parts of tea saponin, 1.5 parts of phospholipid and 2 parts of gelatin into the prepared animal protein foaming agent mother liquor, heating to 40 ℃, uniformly stirring, and cooling to normal temperature after the raw materials are fully dissolved to obtain the compound animal protein foaming agent.
(2) Mixing an animal protein compound type foaming agent and water according to the ratio of 1: 50, and then foaming by using a high-speed foaming machine, wherein the foaming time is 4 minutes until no large bubbles exist in the foam, the foam particles are fine and uniform, and the foam volume is not increased any more.
(3) Adding water into fine aggregate concrete and graphite tailing sand, pre-stirring to prepare uniform slurry, adding a combined additive (the combined additive comprises 8 parts of redispersible rubber powder, 2 parts of polyvinyl alcohol and 2 parts of hydroxypropyl methyl cellulose) and the compound animal protein foaming agent prepared in the step (1), uniformly stirring, and then casting and molding.
Example 3
The heat storage type ground heating backfill cushion comprises the following components in parts by weight: fine aggregate concrete 60, graphite tailing sand 40, an expanding agent 5 and a combined additive 5;
(1) preparing a compound animal protein foaming agent: mixing 8 parts of pig nail, 3 parts of sodium bisulfite, 2 parts of thiourea, 6 parts of urea and 120 parts of water, adjusting the pH value to 5.5, hydrolyzing at 75 ℃ for 6 hours, quickly transferring to a water bath after the reaction is finished, cooling to normal temperature, centrifuging, and filtering to obtain a filtrate, namely the animal protein foaming agent mother solution; and adding 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 3 parts of sodium dodecyl benzene sulfonate, 2 parts of tea saponin, 1.5 parts of phospholipid and 2 parts of gelatin into the prepared animal protein foaming agent mother liquor, heating to 50 ℃, uniformly stirring, and cooling to normal temperature after the raw materials are fully dissolved to obtain the compound animal protein foaming agent.
(2) Mixing an animal protein compound type foaming agent and water according to the ratio of 1: 40, and then foaming by using a high-speed foaming machine for 4 minutes until no large bubbles exist in the foam, the foam particles are fine and uniform, and the foam volume is not increased any more.
(3) Adding water into fine aggregate concrete and graphite tailing sand, pre-stirring to prepare uniform slurry, adding a combined additive (the combined additive comprises 8 parts of redispersible rubber powder, 2 parts of polyvinyl alcohol and 1 part of hydroxypropyl methyl cellulose) and the compound animal protein foaming agent prepared in the step (1), uniformly stirring, and then casting and molding.
Example 1
The heat storage type ground heating backfill cushion comprises the following components in parts by weight: 50 parts of fine aggregate concrete, 50 parts of graphite tailing sand, 4 parts of an expanding agent and 4 parts of a combined additive;
the preparation method of the heat storage type ground heating backfill cushion comprises the following steps:
(1) firstly, preparing a compound animal protein foaming agent: mixing 8 parts of pig nail, 3 parts of sodium bisulfite, 2 parts of thiourea, 6 parts of urea and 120 parts of water, adjusting the pH value to 5.5, hydrolyzing at 75 ℃ for 6 hours, quickly transferring to a water bath after the reaction is finished, cooling to the normal temperature, centrifuging, filtering, and obtaining a filtrate which is the animal protein foaming agent mother liquor; and adding 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 3 parts of sodium dodecyl benzene sulfonate, 2 parts of tea saponin, 1.5 parts of phospholipid and 2 parts of gelatin into the prepared animal protein foaming agent mother liquor, heating to 45 ℃, uniformly stirring, and cooling to normal temperature after the raw materials are fully dissolved to obtain the compound animal protein foaming agent.
(2) Mixing an animal protein compound type foaming agent and water according to the weight ratio of 1: 40, and then foaming by using a high-speed foaming machine for 4 minutes until no large bubbles exist in the foam, the foam particles are fine and uniform, and the foam volume is not increased any more.
(3) Adding water into fine aggregate concrete and graphite tailing sand, pre-stirring to prepare uniform slurry, adding a combined additive (the combined additive comprises 8 parts of redispersible rubber powder, 2 parts of polyvinyl alcohol and 2 parts of hydroxypropyl methyl cellulose) and the compound animal protein foaming agent prepared in the step (1), uniformly stirring, and then casting and molding.
Comparative example 1
The ground heating backfill cushion comprises the following components in parts by weight: fine aggregate concrete 80, an expanding agent 4 and a combined additive 4;
the preparation method of the ground heating backfill cushion layer comprises the following steps:
(1) firstly, preparing a compound animal protein foaming agent: mixing 8 parts of pig nail, 3 parts of sodium bisulfite, 2 parts of thiourea, 6 parts of urea and 120 parts of water, adjusting the pH value to 5.5, hydrolyzing at 75 ℃ for 6 hours, quickly transferring to a water bath after the reaction is finished, cooling to normal temperature, centrifuging, and filtering to obtain a filtrate, namely the animal protein foaming agent mother solution; and adding 3 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 3 parts of sodium dodecyl benzene sulfonate, 2 parts of tea saponin, 1.5 parts of phospholipid and 2 parts of gelatin into the prepared animal protein foaming agent mother liquor, heating to 45 ℃, uniformly stirring, and cooling to normal temperature after the raw materials are fully dissolved to obtain the compound animal protein foaming agent.
(2) Mixing an animal protein compound type foaming agent and water according to the ratio of 1: 40, and then foaming by using a high-speed foaming machine for 4 minutes until no large bubbles exist in the foam, the foam particles are fine and uniform, and the foam volume is not increased any more.
(3) Adding water into fine stone concrete, pre-stirring to prepare uniform slurry, adding a combined additive (the combined additive comprises 8 parts of redispersible rubber powder, 1 part of polyvinyl alcohol and 1 part of hydroxypropyl methyl cellulose) and the compound animal protein foaming agent prepared in the step (1), uniformly stirring, and then casting and molding.
Comparative example2
The ground heating backfill cushion layer adopts C20 pea concrete: the cement is ordinary portland cement with the grade not lower than 32.5, the sand is medium sand or coarse sand, the mud content is not more than 5%, and the particle size of the pea stone is 5-15 mm.
The density, compressive strength and heat storage value of the ground heating backfill cushions of the examples 1-4 and the comparative examples 1-2 are summarized as follows:
as can be seen from the above table, the compressive strength of the heat storage type ground heating backfill cushion prepared by the method is not reduced compared with the backfill cushions in the comparison documents 1 and 2 under the condition of reduced density, but the heat storage value is greatly improved, and the heat storage type ground heating backfill cushion prepared by the method has good heat storage effect and mechanical property.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a backfill bed course warms up heat storage type which characterized in that, backfill bed course warms up heat storage type includes according to parts by weight: 30-60 parts of fine aggregate concrete, 30-60 parts of graphite tailing sand, 2-6 parts of an expanding agent and 2-6 parts of a combined additive.
2. The heat storage type ground heating backfill cushion layer according to claim 1, wherein the heat storage type ground heating backfill cushion layer comprises the following components in parts by weight: 30-60 parts of fine aggregate concrete, 30-50 parts of graphite tailing sand, 2-6 parts of an expanding agent and 2-6 parts of a combined additive.
3. The heat storage type ground heating backfill cushion according to claim 1, wherein the heat storage type ground heating backfill cushion comprises the following components in parts by weight: 30-60 parts of fine aggregate concrete, 40-60 parts of graphite tailing sand, 2-6 parts of an expanding agent and 2-6 parts of a combined additive.
4. The heat storage type ground heating backfill cushion according to claim 1, wherein the expanding agent is an animal protein compound type foaming agent.
5. The heat storage type ground heating backfill cushion according to claim 4, wherein the preparation method of the animal protein compound type foaming agent comprises the following steps:
(1) mixing pig nail, sodium bisulfite, thiourea, urea and water, adjusting the pH value to 5.5, hydrolyzing at 70-80 ℃, quickly transferring to a water bath after the reaction is finished, cooling to normal temperature, centrifuging, and filtering to obtain a filtrate, namely the animal protein foaming agent mother liquor;
(2) adding fatty alcohol-polyoxyethylene ether sodium sulfate, sodium dodecyl benzene sulfonate, tea saponin, phospholipid and gelatin into the prepared animal protein foaming agent mother liquor, heating to 40-50 ℃, uniformly stirring, and cooling to normal temperature after the raw materials are fully dissolved to obtain the compound animal protein foaming agent.
6. The heat storage type ground heating backfill cushion according to claim 1, wherein the combined additive comprises redispersible rubber powder, polyvinyl alcohol and hydroxypropyl methyl cellulose;
preferably, the weight ratio of the redispersible rubber powder, the polyvinyl alcohol and the hydroxypropyl methylcellulose is 8: 1-2: 1 to 2.
7. A regenerative floor heating backfill cushion according to claim 6, characterized in that the redispersible rubber powder is selected from one or more of the following rubber powders: vinyl acetate and ethylene copolymerized rubber powder, vinyl acetate and higher fatty acid vinyl ester copolymerized rubber powder, acrylic ester and styrene copolymerized rubber powder, vinyl acetate homopolymerized rubber powder and styrene and butadiene copolymerized rubber powder.
8. A preparation method of the heat storage type ground heating backfill cushion layer according to any one of claims 1 to 7, characterized by comprising the following steps:
(1) mixing an expanding agent, namely an animal protein compound type foaming agent with water, and then foaming by using a high-speed foaming machine;
(2) adding water into the fine aggregate concrete and the graphite tailing sand, pre-stirring to prepare uniform slurry, then adding the combined additive and the expanding agent prepared in the step (1), uniformly stirring, and then casting and molding.
9. The preparation method of claim 8, wherein the animal protein compound foaming agent and the water are mixed in a ratio of 1: mixing at a ratio of 40-50;
preferably, the rotating speed of the stirring blade during bubble making is 700-800 revolutions per minute; the foam making time is 3-5 minutes until no large foam exists in the foam, the foam particles are fine and uniform, and the foam volume is not increased any more.
10. The application of the heat storage type ground heating backfill cushion layer of any one of claims 1-7 in a ground heating.
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CN202210566404.1A Withdrawn CN114772990A (en) | 2022-05-23 | 2022-05-23 | Heat storage type ground heating backfill cushion layer and preparation method and application thereof |
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CN117602909A (en) * | 2024-01-22 | 2024-02-27 | 湖南瑞砂环境科技有限公司 | Floor heating special cement mortar based on tungsten tailings and preparation method thereof |
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Cited By (2)
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CN117602909A (en) * | 2024-01-22 | 2024-02-27 | 湖南瑞砂环境科技有限公司 | Floor heating special cement mortar based on tungsten tailings and preparation method thereof |
CN117602909B (en) * | 2024-01-22 | 2024-05-17 | 湖南瑞砂环境科技有限公司 | Floor heating special cement mortar based on tungsten tailings and preparation method thereof |
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