CN112500077A - Emulsion modified foamed concrete and preparation method and application thereof - Google Patents
Emulsion modified foamed concrete and preparation method and application thereof Download PDFInfo
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- CN112500077A CN112500077A CN202011466517.1A CN202011466517A CN112500077A CN 112500077 A CN112500077 A CN 112500077A CN 202011466517 A CN202011466517 A CN 202011466517A CN 112500077 A CN112500077 A CN 112500077A
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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
- C04B2111/40—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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- 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 discloses emulsion modified foaming concrete and a preparation method and application thereof, belonging to the field of concrete, and comprising mixed powder, EVV modified emulsion and foaming agent, wherein the mixing amount of the EVV modified emulsion is 0.8-1.05% of the mass of the mixed powder, the mixing amount of the foaming agent is 0.03-0.05% of the mass of the mixed powder, and the mixed powder comprises the following components in percentage by weight: 50 to 80 percent of Portland cement, 20 to 50 percent of fly ash, 0.1 to 0.15 percent of cellulose and 1.5 to 2.5 percent of fiber. The EVV modified emulsion can reduce the water absorption of the foam concrete, and has better waterproof impermeability, water resistance, durability and compressive strength compared with the traditional cement-based foam concrete.
Description
Technical Field
The invention mainly relates to the field of concrete, in particular to emulsion modified foamed concrete and a preparation method and application thereof.
Background
The foamed concrete has the characteristics of light weight, heat preservation, heat insulation, sound insulation, combustion resistance, good earthquake resistance and the like, is widely used as an energy-saving wall material, and is widely applied to the fields of cavity filling engineering, high-temperature kilns, sound barriers, military target walls and the like.
However, the concrete structure inherently has a large number of pores, which leads to easy water leakage, higher porosity after foaming, higher water absorption and lower water-proof and anti-permeability, resulting in poor strength and durability, and after low-temperature freezing weather, phenomena such as pulverization, complete loss of strength and the like easily occur, and the service life of the foam concrete structure is reduced. In order to avoid such a situation, it is usually necessary to make a waterproof layer on the outside of the foam concrete structure to improve the service life thereof, which greatly increases the cost.
Disclosure of Invention
The invention aims to provide emulsion modified foamed concrete with low water absorption, high strength and good durability, and a preparation method and application thereof. According to the invention, the EVV emulsion is added to improve the waterproof impermeability of the foamed concrete, the water resistance and durability of the foamed concrete are improved, a waterproof layer is not required to be added, the comprehensive use cost is reduced, the structure weight is reduced, and the development prospect is strong.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
on the one hand, the emulsion modified foaming concrete comprises mixed powder, EVV modified emulsion and a foaming agent, wherein the mixing amount of the EVV modified emulsion is 0.8-1.05% of the mass of the mixed powder, the mixing amount of the foaming agent is 0.03-0.05% of the mass of the mixed powder, and the mixed powder comprises the following components in percentage by weight: 50 to 80 percent of Portland cement, 18 to 50 percent of fly ash, 0.1 to 0.15 percent of cellulose and 1.5 to 2.5 percent of fiber.
The foamed concrete of the invention takes powder materials such as portland cement, fly ash and the like as main materials, reduces the water absorption of the foamed concrete by utilizing the EVV modified emulsion with certain hydrophobicity, and obtains the foamed concrete with low water absorption, high water resistance, durability and high compressive strength by matching with various components.
The portland cement of the present invention may be ordinary portland cement.
Further, the EVV modified emulsion is prepared by polymerizing three monomers, namely ethylene, vinyl chloride and vinyl laurate and adding nano organic silicon. The EVV emulsion has good waterproof impermeability and extraordinary flexibility, the elongation at break exceeds 500 percent, and the EVV emulsion does not contain an emulsifier, is unsaponifiable, has high stability and durability in an alkaline environment, and can keep high bending resistance, compression resistance and wear resistance even if contacting water.
Further, the mixed powder comprises the following components in percentage by weight: 60 to 80 percent of Portland cement, 18.4 to 38.4 percent of fly ash, 0.1 to 0.15 percent of cellulose and 1.5 to 2.5 percent of fiber.
Furthermore, the foaming agent is compounded by a hydrolyzed animal protein foaming agent and a tea saponin foaming agent.
Further, the fibers are 6-9 mm polypropylene fibers or alkali-resistant glass fibers.
Further, the powder material also comprises water, and the mixing amount of the water is 30-54% of the mass of the mixed powder material.
On the other hand, the preparation method of the emulsion modified foaming concrete comprises the following steps:
s1, preparing mixed powder: weighing cement, fly ash, cellulose and fiber according to a mass ratio, pouring the weighed materials into a stirrer, and stirring until the materials are uniformly dispersed;
s2, weighing water and the EVV modified emulsion according to the mass ratio, uniformly mixing, adding into the mixed powder, and stirring to obtain slurry; wherein, the mixing amount of the water is 30 to 54 percent of the mass of the mixed powder;
s3, weighing a certain amount of foaming agent, diluting with water 60 times the mass of the foaming agent, placing the foaming agent into a foaming machine for foaming to obtain foam, driving the foam into slurry, stirring to uniformly disperse the foam, pouring the foam into a mold, and demolding and maintaining the mold after placement to obtain the foam concrete.
Further, in step S3, the demolding and curing method includes: the mixture is placed indoors at the temperature of 15-25 ℃ for 24-36 h, then demoulded, and then is maintained indoors at the temperature of 15-25 ℃ for 7-14 days.
On the other hand, the foam concrete prepared by the preparation method is used as an energy-saving heat-insulating wallboard, a heat-insulating building block, a foam concrete backfill layer or a foam concrete ground heat-insulating layer and the like.
After adopting such design, the invention has at least the following advantages:
the EVV modified emulsion can reduce the water absorption of the foam concrete, and has better waterproof impermeability, water resistance, durability and compressive strength compared with the traditional cement-based foam concrete.
Detailed Description
The present invention is further illustrated by the following examples, but the present invention is not limited to the following examples, and any products similar or equivalent to the present invention, which are obtained by the teaching of the present invention, are within the scope of protection.
Example 1:
the emulsion modified foamed concrete of this example includes the following components by mass: 460 parts of ordinary #425 portland cement, 441.67 parts of fly ash, 0.22 part of special foaming agent, 9.6 parts of EVV modified emulsion, 4.6 parts of cellulose and 18.33 parts of 6mm long polypropylene fiber.
Ordinary portland cement, fly ash, cellulose and fibers are weighed according to the proportion, added into a stirrer and stirred for 3min, and added with 422 parts by weight of water and 9.6 parts by weight of EVV modified emulsion and stirred for 3 min. Diluting 0.22 weight part of special foaming agent with 13.2 weight parts of water, placing the mixture into a foaming machine for foaming, then injecting foam into the slurry, stirring for 4min to uniformly mix the foam, pouring the mixture into a mold, standing the mixture in a room at 20 ℃ for 30h, then demolding, and then maintaining the mixture in the room at 20 ℃ for 14 days.
The foamed concrete prepared as described above had a dry density of 1120kg/m3The compressive strength is 8.1MPa, and the water absorption rate is 2.5 percent.
Example 2
The emulsion modified foamed concrete of this example includes the following components by mass: 560 parts of ordinary #425 portland cement, 188 parts of fly ash, 0.38 part of special foaming agent, 7.8 parts of EVV modified emulsion, 0.8 part of cellulose and 14 parts of 6mm glass fiber.
The ordinary portland cement, the fly ash, the cellulose and the fibers are weighed according to the proportion, added into a stirrer and stirred for 3min, and 305 parts by weight of water and 7.8 parts by weight of EVV modified emulsion are added and stirred for 3 min. Diluting 0.38 weight part of special foaming agent with 22.2 weight parts of water, placing the mixture into a foaming machine for foaming, then injecting foam into slurry, stirring for 4min to uniformly mix the foam, pouring the mixture into a mold, standing the mixture in a room at 20 ℃ for 30h, then demolding, and then maintaining the mixture in the room at 20 ℃ for 14 days.
The foamed concrete prepared as described above had a dry density of 841kg/m3The compressive strength is 6.4MPa, and the water absorption is 3.7%.
Example 3
The emulsion modified foamed concrete of this example includes the following components by mass: 675 parts of ordinary #425 portland cement, 300 parts of fly ash, 0.19 part of special foaming agent, 10.2 parts of EVV modified emulsion, 5.5 parts of cellulose and 19.5 parts of 6mm glass fiber.
Ordinary portland cement, fly ash, cellulose and fibers are weighed according to the proportion, added into a stirrer and stirred for 3min, and added with 452 parts by weight of water and 10.2 parts by weight of EVV modified emulsion and stirred for 3 min. Diluting 0.19 weight part of special foaming agent with 11.1 weight parts of water, placing the mixture into a foaming machine for foaming, then injecting foam into the slurry, stirring for 4min to uniformly mix the foam, pouring the mixture into a mold, standing the mixture in a room at 20 ℃ for 30h, then demolding, and then maintaining the mixture in the room at 20 ℃ for 14 days.
The foamed concrete prepared as described above had a dry density of 1180kg/m3The compressive strength is 12.5MPa, and the water absorption rate is 2.0 percent.
Example 4
The emulsion modified foamed concrete of this example includes the following components by mass: 467 parts of ordinary #425 portland cement, 117 parts of fly ash, 0.48 part of special foaming agent, 6 parts of EVV modified emulsion, 1 part of cellulose and 11.7 parts of 6mm glass fiber.
Ordinary portland cement, fly ash, cellulose and fibers are weighed according to the proportion, added into a stirrer and stirred for 3min, 248 parts by weight of water and 6 parts by weight of EVV modified emulsion are added and stirred for 3 min. Diluting 0.48 weight part of special foaming agent with 28.8 weight parts of water, placing the mixture into a foaming machine for foaming, then injecting foam into the slurry, stirring for 4min to uniformly mix the foam, pouring the mixture into a mold, standing the mixture in a room at 20 ℃ for 30h, then demolding, and then maintaining the mixture in the room at 20 ℃ for 14 days.
The foamed concrete prepared as described above had a dry density of 695kg/m3The compressive strength is 4.5MPa, and the water absorption is 4.2%.
In the above embodiment, the EVV modified emulsion is prepared by polymerizing three monomers, i.e., ethylene, vinyl chloride, and vinyl laurate, and adding nano-silicone.
In the above embodiment, the special foaming agent is formed by compounding a hydrolyzed animal protein foaming agent and a tea saponin foaming agent.
Comparative example 1
The foamed concrete of this comparative example comprises the following components by mass: 467 parts of ordinary #425 portland cement, 117 parts of fly ash, 0.48 part of special foaming agent, 6 parts of non-organic silicon modified EVV emulsion, 1 part of cellulose and 15 parts of 6mm glass fiber. The non-organic silicon modified EVV emulsion is prepared by polymerizing ethylene, vinyl chloride and vinyl laurate, and is not modified by adding nano organic silicon.
Weighing the ordinary portland cement, the fly ash, the cellulose and the fibers according to the proportion, adding the mixture into a stirrer to stir for 3min, adding 248 parts by weight of water and 3 parts by weight of the non-organic silicon modified EVV emulsion to stir for 3 min. Diluting 0.48 weight part of special foaming agent with 28.8 weight parts of water, placing the mixture into a foaming machine for foaming, then injecting foam into the slurry, stirring for 4min to uniformly mix the foam, pouring the mixture into a mold, standing the mixture in a room at 20 ℃ for 30h, then demolding, and then maintaining the mixture in the room at 20 ℃ for 14 days.
The foamed concrete prepared as described above had a dry density of 690kg/m3The compressive strength is 2.5MPa, and the water absorption is 7.9%.
Comparative example 2
The foamed concrete of this comparative example comprises the following components by mass: 467 parts of ordinary #425 portland cement, 117 parts of fly ash, 0.48 part of special foaming agent, 36 parts of dispersing emulsion, 1 part of cellulose and 15 parts of 6mm glass fiber. Wherein the dispersion emulsion is a commercial styrene-acrylic emulsion, and the glass transition temperature Tg is 0 ℃.
Weighing the ordinary portland cement, the fly ash, the cellulose and the fibers according to the proportion, adding the materials into a stirrer to stir for 3min, adding 248 parts by weight of water and 36 parts by weight of styrene-acrylic emulsion to stir for 3 min. Diluting 5 parts by weight of the special foaming agent with 28.8 parts by weight of water, placing the mixture into a foaming machine for foaming, then injecting the foam into the slurry, stirring for 4min to uniformly mix the foam, pouring the mixture into a mold, standing the mixture in a room at 20 ℃ for 30h, then demolding, and then maintaining the mixture in the room at 20 ℃ for 14 days.
The foamed concrete prepared as described above had a dry density of 685kg/m3The compressive strength is 2.2MPa, and the water absorption is 7.5 percent.
Comparative example 3
The foamed concrete of this comparative example comprises the following components by mass: 467 parts of ordinary #425 portland cement, 117 parts of fly ash, 0.48 part of ordinary foaming agent, 36 parts of dispersed emulsion, 1 part of cellulose and 15 parts of 6mm glass fiber. Wherein the dispersion emulsion is a commercial pure acrylic emulsion, and the glass transition temperature Tg is 0 ℃.
Weighing the ordinary portland cement, the fly ash, the cellulose and the fibers according to the proportion, adding the materials into a stirrer to stir for 3min, adding 248 parts by weight of water and 36 parts by weight of the dispersion emulsion to stir for 3 min. Diluting 5 parts by weight of the special foaming agent with 28.8 parts by weight of water, placing the mixture into a foaming machine for foaming, then injecting the foam into the slurry, stirring for 4min to uniformly mix the foam, pouring the mixture into a mold, standing the mixture in a room at 20 ℃ for 30h, then demolding, and then maintaining the mixture in the room at 20 ℃ for 14 days.
The foamed concrete prepared as described above had a dry density of 685kg/m3The compressive strength is 2.3MPa, and the water absorption is 7.2 percent.
In the above examples and comparative examples, the unit of the parts by weight of each substance may be in kilograms, and may also be in grams, tons or other weight units as long as the substances can be uniformly mixed.
The performance of the foam concrete prepared in the above examples 1 to 4 and comparative examples 1 to 3 of the present invention was tested, and as shown in table 1, the results show that the foam concrete added with the modified EVV emulsion has higher compressive strength, lower water absorption and less addition amount.
TABLE 1 examination results of the foam concrete produced in example 4 and comparative examples 1 to 3
| Item | Emulsion and method of making | Addition amount/fraction | Density/kg/m3 | Compressive strength/MPa | Water absorption/%) |
| Example 4 | EVV emulsions | 6 | 695 | 4.5 | 4.2 |
| Comparative example 1 | Non-silicone modified EVV emulsion | 6 | 690 | 2.5 | 7.9 |
| Comparative example 2 | Styrene-acrylic emulsion | 36 | 685 | 2.2 | 7.5 |
| Comparative example 3 | Pure acrylic emulsion | 36 | 685 | 2.3 | 7.2 |
As shown in Table 1, the comparison between example 4 and comparative example 1 shows that the EVV emulsion without silicone modification not only can make the water absorption of the insulation board higher, but also can not effectively improve the compressive strength, which indicates that the EVV emulsion modified by silicone not only increases hydrophobicity to reduce the hydrophobicity, but also has a great influence on the compressive strength.
The EVV modified emulsion can reduce the water absorption of the foam concrete, and has better waterproof impermeability, water resistance, durability and compressive strength compared with the traditional cement-based foam concrete.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (9)
1. The emulsion modified foaming concrete is characterized by comprising mixed powder, EVV modified emulsion and a foaming agent, wherein the mixing amount of the EVV modified emulsion is 0.8-1.05% of the mass of the mixed powder, the mixing amount of the foaming agent is 0.03-0.05% of the mass of the mixed powder, and the mixed powder comprises the following components in percentage by weight: 50 to 80 percent of Portland cement, 18 to 50 percent of fly ash, 0.1 to 0.15 percent of cellulose and 1.5 to 2.5 percent of fiber.
2. The emulsion modified foaming concrete of claim 1, wherein the EVV modified emulsion is prepared by polymerizing three monomers of ethylene, vinyl chloride and vinyl laurate and adding nano-silicone.
3. The emulsion-modified foamed concrete according to claim 1, wherein the powder mixture comprises the following components in percentage by weight: 60 to 80 percent of Portland cement, 18.4 to 38.4 percent of fly ash, 0.1 to 0.15 percent of cellulose and 1.5 to 2.5 percent of fiber.
4. The emulsion modified foaming concrete of any one of claims 1 to 3, wherein the foaming agent is a mixture of a hydrolyzed animal protein foaming agent and a tea saponin foaming agent.
5. The emulsion modified foamed concrete according to any one of claims 1 to 4, wherein the fibers are polypropylene fibers, alkali-resistant glass fibers or basalt fibers of 6 to 9 mm.
6. The emulsion modified foamed concrete according to any one of claims 1 to 5, further comprising water in an amount of 30 to 54% by mass of the mixed powder.
7. A method for preparing the emulsion modified foamed concrete according to any one of claims 1 to 6, comprising the steps of:
s1, preparing mixed powder: weighing cement, fly ash, cellulose and fiber according to a mass ratio, pouring the weighed materials into a stirrer, and stirring until the materials are uniformly dispersed;
s2, weighing water and the EVV modified emulsion according to the mass ratio, uniformly mixing, adding into the mixed powder, and stirring to obtain slurry; wherein, the mixing amount of the water is 30 to 54 percent of the mass of the mixed powder;
s3, weighing a certain amount of foaming agent, diluting with water 60 times the mass of the foaming agent, placing the foaming agent into a foaming machine for foaming to obtain foam, driving the foam into slurry, stirring to uniformly disperse the foam, pouring the foam into a mold, and demolding and maintaining the mold after placement to obtain the foam concrete.
8. The method for preparing emulsion modified foamed concrete according to claim 7, wherein in step S3, the method for demolding and curing comprises: the mixture is placed indoors at the temperature of 15-25 ℃ for 24-36 h, then demoulded, and then is maintained indoors at the temperature of 15-25 ℃ for 7-14 days.
9. The application of the emulsion modified foamed concrete is characterized in that the foamed concrete prepared by the preparation method of claim 7 or 8 is used as an energy-saving heat-insulating wallboard, a heat-insulating block, a foam concrete backfill layer or a foam concrete ground heat-insulating layer.
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| CN202011466517.1A CN112500077A (en) | 2020-12-14 | 2020-12-14 | Emulsion modified foamed concrete and preparation method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114014694A (en) * | 2021-11-15 | 2022-02-08 | 东北大学 | Hydrophobic heat-preservation foam concrete prefabricated part and preparation method thereof |
-
2020
- 2020-12-14 CN CN202011466517.1A patent/CN112500077A/en active Pending
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| 夏正斌等: "疏水性可再分散聚合物乳胶粉的研究进展", 《涂料工业》 * |
| 肖啸等: "有机纤维种类及掺量对泡沫混凝土性能的影响", 《四川建材》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114014694A (en) * | 2021-11-15 | 2022-02-08 | 东北大学 | Hydrophobic heat-preservation foam concrete prefabricated part and preparation method thereof |
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