CN109776041B - Recycled brick prepared from building waste and preparation method thereof - Google Patents
Recycled brick prepared from building waste and preparation method thereof Download PDFInfo
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- CN109776041B CN109776041B CN201910271680.3A CN201910271680A CN109776041B CN 109776041 B CN109776041 B CN 109776041B CN 201910271680 A CN201910271680 A CN 201910271680A CN 109776041 B CN109776041 B CN 109776041B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a recycled brick prepared from building wastes and a preparation method thereof, belonging to the technical field of building materials. The building waste aggregate anti-freezing agent comprises 100 parts of building waste aggregate, 10-20 parts of kaolin, 30-50 parts of fly ash, 1-5 parts of water reducing agent, 1-5 parts of early strength agent, 1-5 parts of anti-freezing agent and 15-25 parts of water in parts by weight; wherein the building waste aggregate comprises: 50-60% of heavy aggregate, 30-40% of light aggregate and 5-10% of wood fiber according to weight percentage; the heavy aggregate is derived from waste concrete, waste tiles and waste stone, the light aggregate is derived from waste ceramic and waste glass, and the wood fiber is derived from waste wood. The recycled brick provided by the invention utilizes building waste as aggregate, so that the problem of resource waste is solved, the resource is recycled, the high-strength recycled brick is obtained through reasonable material selection and raw material grading, the service life of the recycled brick is prolonged, and the application of the recycled brick is expanded.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a recycled brick prepared by utilizing building wastes.
Background
The recycled brick is a brick body which takes construction waste as aggregate and is prepared by partially or completely replacing natural aggregate, realizes the recycling of resources, is green and environment-friendly, and is gradually valued by people. But the existing regenerated brick has lower strength, so that the service life is shorter and the application range is limited.
Disclosure of Invention
The invention aims to provide a recycled brick prepared from building wastes and a preparation method thereof, which solve the problem of building waste resource waste on one hand and solve the problems of low strength and short service life of the conventional recycled brick on the other hand.
The technical scheme for solving the technical problems is as follows:
a recycled brick prepared from building wastes is prepared from the following raw materials: 100 parts of building waste aggregate, 10-20 parts of kaolin, 30-50 parts of fly ash, 1-5 parts of water reducing agent, 1-5 parts of early strength agent, 1-5 parts of antifreezing agent and 15-25 parts of water in parts by weight;
wherein the building waste aggregate comprises: 50-60% of heavy aggregate, 30-40% of light aggregate and 5-10% of wood fiber according to weight percentage; the heavy aggregate is derived from waste concrete, waste tiles and waste stone, the light aggregate is derived from waste ceramic and waste glass, and the wood fiber is derived from waste wood.
The recycled brick aggregate is completely derived from building wastes, so that the recycling of resources is realized, and the environment is protected. The building wastes adopted by the invention comprise waste concrete, waste tiles, waste stone, waste ceramic, waste glass and waste wood, and the materials are common materials in buildings and have wide and easily-obtained sources; the waste concrete, the waste tiles and the waste stone are used as coarse aggregates, the waste ceramic and the waste glass are used as fine aggregates, wood fibers made of the waste wood are used as reinforcements, and the strength of the recycled brick is greatly improved and the service life of the recycled brick is prolonged through reasonable grading between the coarse and fine aggregates and the reinforcements.
According to the invention, waste wood is recycled and made into wood fibers which are added into the brick body, and the wood fibers are in a three-dimensional disorderly distributed net structure in the brick body, so that the supporting effect is achieved, microcracks can be prevented from forming in the brick body, and the anti-cracking performance of the brick body is improved; meanwhile, wood fibers distributed in a disorderly direction can also play a role in connecting and forming reinforcing ribs, so that the breaking strength of the brick body is improved, and the toughness and the durability of the brick body are improved. In addition, because wood fiber's addition, when sound got into the internal portion of brick, can drive wood fiber and take place vibrations, the elastic shock of these wood fiber can consume great acoustic energy to make the regeneration brick still have certain sound absorption performance, have the effect of making an uproar.
Further, in a preferred embodiment of the present invention, the mass ratio of the waste concrete, the waste tiles and the waste stone in the heavy aggregate is 1: (0.5-1): (0.5-1).
Further, in a preferred embodiment of the present invention, the weight ratio of the waste ceramics to the waste glass in the lightweight aggregate is 1: (0.8-1.2).
Further, in a preferred embodiment of the present invention, the lightweight aggregate further includes waste gypsum, and the mass ratio of the waste ceramic, the waste glass and the waste gypsum is 1: (0.8-1.2): (0.5-1).
The waste gypsum is added into the building waste, and can be used as a fine aggregate for filling and a gelling agent to accelerate the hardening and forming of the brick body.
Further, in a preferred embodiment of the present invention, the wood fibers have a length of 10mm to 15 mm.
The length of the wood fiber is limited within the range of 10mm-15mm, the wood fiber in the range is easy to disperse and can be better fused with other materials, the wood fiber is not wound into sections due to overlong length, the stability of the internal structure of a brick body is not influenced, the wood fiber is not agglomerated due to too short length and is not beneficial to dispersion, and the flowability of the material is influenced in the preparation process; moreover, wood fiber with the thickness of 10mm-15mm is more beneficial to erecting a three-dimensional net structure in the brick body, and the obtained brick body has better strength and sound absorption effect.
Further, in a preferred embodiment of the present invention, the wood fiber is prepared by the following method:
step A: cleaning waste wood, and preparing a crude fiber product by a papermaking chemical mechanical pulp method;
and B: soaking the fiber crude product in alkali liquor, then cleaning with ethanol until the solution is neutral, and then filtering and drying to obtain a fiber semi-finished product;
and C: soaking the fiber semi-finished product in a treatment solution, filtering and drying to obtain wood fibers; wherein the mass ratio of the fiber semi-finished product to the treatment liquid is 1: (5-8), the treatment liquid comprises, by weight, 5-8 parts of sodium lauryl sulfate, 1-3 parts of methyl eleostearate anhydride, 4-6 parts of hydroxyethyl cellulose and 70-80 parts of acetone.
Further, in a preferred embodiment of the present invention, in step B, the concentration of the alkali solution is 5wt% to 10wt%, and the mass ratio of the crude fiber product to the alkali solution is 1: (30-40), wherein the alkali liquor is one or a combination of more of potassium hydroxide solution, sodium hydroxide solution and sodium bicarbonate solution; the soaking conditions of the crude fiber product in alkali liquor are as follows: soaking for 8-12 h at 25-35 deg.C.
Further, in a preferred embodiment of the present invention, in step C, the soaking conditions are: ultrasonic treatment is carried out for 2h-3h at the temperature of 80-120 ℃.
The wood fiber is subjected to sexual treatment by using the treatment solution designed by the invention, so that the strength and toughness of the wood fiber can be improved, the strength and toughness of a brick body are further improved, and meanwhile, the wood fiber treated by the treatment solution has better dispersing capacity, can be better combined with other materials, and increases the interface strength.
A preparation method of a recycled brick prepared from building waste comprises the steps of mixing and uniformly stirring building waste aggregate, kaolin, fly ash, a water reducing agent, an early strength agent, an antifreezing agent and water, carrying out curing at the temperature of 20-25 ℃ and the ambient humidity of more than 85% after compression molding, and obtaining the recycled brick after the curing is finished.
Further, in the preferred embodiment of the present invention, during the mixing, the stirring is continued for 20min to 30min in the clockwise or counterclockwise direction, and then the stirring is performed for 45min to 60min in the clockwise and counterclockwise alternating manner.
According to the invention, the mixture can be more compact in the stirring process through clockwise and anticlockwise alternate stirring, so that higher strength can be obtained.
The invention has the following beneficial effects:
the recycled brick provided by the invention utilizes building wastes as aggregates, so that the problem of resource waste is solved, and the resources are recycled. Meanwhile, the preparation process is simple and is beneficial to production and manufacturing.
Detailed Description
The principles and features of this invention are described below in conjunction with embodiments, which are included to explain the invention and not to limit the scope of the invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1:
the recycled brick of the embodiment is prepared from the following raw materials: 100 parts of building waste aggregate, 10 parts of kaolin, 30 parts of fly ash, 1 part of water reducing agent, 1 part of early strength agent, 1 part of antifreezing agent and 15 parts of water in parts by weight; wherein the building waste aggregate comprises: 50% of heavy aggregate, 40% of light aggregate and 10% of wood fiber in percentage by weight; the heavy aggregate comprises waste concrete, waste bricks and tiles and waste stone materials, and the mass ratio of the waste concrete to the waste bricks and tiles to the waste stone materials is 1: 0.5: 0.5; the lightweight aggregate comprises waste ceramic and waste glass, and the mass ratio of the waste ceramic to the waste glass is 1: 0.8.
the wood fibers of this example were prepared by the following method:
step A: cleaning waste wood, and preparing a crude fiber product by a papermaking chemical mechanical pulp method;
and B: soaking the crude fiber product in 5wt% alkali liquor at 35 ℃ for 8h, wherein the mass ratio of the crude fiber product to the alkali liquor is 1: 30, the alkali liquor is one or a combination of more of potassium hydroxide solution, sodium hydroxide solution and sodium bicarbonate solution; then washing with ethanol until the solution is neutral, and then filtering and drying to obtain a fiber semi-finished product;
and C: soaking the fiber semi-finished product in a treatment solution and performing ultrasonic treatment for 3 hours at 80 ℃; filtering and drying to obtain wood fiber; wherein the mass ratio of the fiber semi-finished product to the treatment liquid is 1: 5, the treatment liquid comprises 5 parts of sodium lauryl sulfate, 1 part of methyl eleostearate anhydride, 4 parts of hydroxyethyl cellulose and 70 parts of acetone in parts by weight.
The length of the wood fibers of this example was 15 mm.
The preparation method of the recycled brick comprises the following steps: the building waste aggregate, kaolin, fly ash, a water reducing agent, an early strength agent, an antifreezing agent and water are mixed and uniformly stirred, and during mixing, the mixture is continuously stirred for 20min in a clockwise or anticlockwise direction, and then is stirred for 45min in a clockwise and anticlockwise alternating manner. And curing the pressed and molded brick under the conditions that the temperature is 20 ℃ and the environmental humidity is more than 85 percent, and obtaining the regenerated brick after the curing is finished.
Example 2:
the recycled brick of the embodiment is prepared from the following raw materials: 100 parts of building waste aggregate, 20 parts of kaolin, 50 parts of fly ash, 5 parts of water reducing agent, 5 parts of early strength agent, 5 parts of antifreezing agent and 25 parts of water in parts by weight; wherein the building waste aggregate comprises: 60% of heavy aggregate, 32% of light aggregate and 8% of wood fiber in percentage by weight; the heavy aggregate comprises waste concrete, waste bricks and tiles and waste stone materials, and the mass ratio of the waste concrete to the waste bricks and tiles to the waste stone materials is 1: 1: 1; the lightweight aggregate comprises waste ceramic and waste glass, and the mass ratio of the waste ceramic to the waste glass is 1: 1.2.
the wood fibers of this example were prepared by the following method:
step A: cleaning waste wood, and preparing a crude fiber product by a papermaking chemical mechanical pulp method;
and B: soaking the crude fiber product in 10wt% of alkali liquor at 25 ℃ for 8-12 h, wherein the mass ratio of the crude fiber product to the alkali liquor is 1: 40, the alkali liquor is one or a combination of more of potassium hydroxide solution, sodium hydroxide solution and sodium bicarbonate solution; then washing with ethanol until the solution is neutral, and then filtering and drying to obtain a fiber semi-finished product;
and C: soaking the fiber semi-finished product in a treatment solution and performing ultrasonic treatment for 2 hours at 120 ℃; filtering and drying to obtain wood fiber; wherein the mass ratio of the fiber semi-finished product to the treatment liquid is 1: 8, the treatment liquid comprises 8 parts by weight of sodium lauryl sulfate, 3 parts by weight of methyl eleostearate anhydride, 6 parts by weight of hydroxyethyl cellulose and 80 parts by weight of acetone.
The length of the wood fibers of this example was 10 mm.
The preparation method of the recycled brick comprises the following steps: the building waste aggregate, kaolin, fly ash, a water reducing agent, an early strength agent, an antifreezing agent and water are mixed and uniformly stirred, and during mixing, the mixture is continuously stirred for 30min in a clockwise or anticlockwise direction, and then is stirred for 60min in a clockwise and anticlockwise alternating manner. And curing the pressed and molded brick at the temperature of 25 ℃ and the environmental humidity of more than 85 percent to obtain the regenerated brick after the curing is finished.
Example 3:
the recycled brick of the embodiment is prepared from the following raw materials: 100 parts of building waste aggregate, 15 parts of kaolin, 40 parts of fly ash, 2 parts of water reducing agent, 2 parts of early strength agent, 2 parts of antifreezing agent and 20 parts of water in parts by weight; wherein the building waste aggregate comprises: 55% of heavy aggregate, 35% of light aggregate and 10% of wood fiber in percentage by weight; the heavy aggregate comprises waste concrete, waste bricks and tiles and waste stone materials, and the mass ratio of the waste concrete to the waste bricks and tiles to the waste stone materials is 1: 0.8: 0.8; the lightweight aggregate comprises waste ceramic and waste glass, and the mass ratio of the waste ceramic to the waste glass is 1: 1.
the wood fibers of this example were prepared by the following method:
step A: cleaning waste wood, and preparing a crude fiber product by a papermaking chemical mechanical pulp method;
and B: soaking the crude fiber product in 8 wt% of alkali liquor at 30 ℃ for 10h, wherein the mass ratio of the crude fiber product to the alkali liquor is 1: 35, the alkali liquor is one or a combination of more of potassium hydroxide solution, sodium hydroxide solution and sodium bicarbonate solution; then washing with ethanol until the solution is neutral, and then filtering and drying to obtain a fiber semi-finished product;
and C: soaking the fiber semi-finished product in the treatment solution and performing ultrasonic treatment at 100 ℃ for 2.5 h; filtering and drying to obtain wood fiber; wherein the mass ratio of the fiber semi-finished product to the treatment liquid is 1: 6, the treatment liquid comprises 7 parts by weight of sodium lauryl sulfate, 2 parts by weight of methyl eleostearate anhydride, 5 parts by weight of hydroxyethyl cellulose and 75 parts by weight of acetone.
The preparation method of the recycled brick comprises the following steps: the building waste aggregate, kaolin, fly ash, a water reducing agent, an early strength agent, an antifreezing agent and water are mixed and uniformly stirred, and during mixing, the mixture is continuously stirred for 25min in a clockwise or anticlockwise direction, and then is stirred for 50min in a clockwise and anticlockwise alternating manner. And curing the mixture after the pressing and forming under the conditions that the temperature is 22 ℃ and the environmental humidity is more than 85 percent, and obtaining the regenerated brick after the curing is finished.
The length of the wood fibers of this example was 12 mm.
Example 4:
this example is substantially the same as example 3, except that the recycled brick of this example further includes waste gypsum in its lightweight aggregate, and the mass ratio of waste ceramic, waste glass and waste gypsum is 1: 1: 0.5.
example 5:
this example is substantially the same as example 3, except that the recycled brick of this example further includes waste gypsum in its lightweight aggregate, and the mass ratio of waste ceramic, waste glass and waste gypsum is 1: 1: 1.
example 6:
this example is substantially the same as example 3, except that the recycled brick of this example further includes waste gypsum in its lightweight aggregate, and the mass ratio of waste ceramic, waste glass and waste gypsum is 1: 1: 0.8.
in other examples not listed in the present invention, waste gypsum can also be added to the lightweight aggregate based on examples 1 and 2.
Comparative example 1
This comparative example is essentially the same as example 3, except that the wood fibers are prepared by a different process, omitting step C, which comprises:
step A1: cleaning waste wood, and preparing a crude fiber product by a papermaking chemical mechanical pulp method;
step B1: soaking the crude fiber product in 8 wt% of alkali liquor at 30 ℃ for 10h, wherein the mass ratio of the crude fiber product to the alkali liquor is 1: 35, the alkali liquor is one or a combination of more of potassium hydroxide solution, sodium hydroxide solution and sodium bicarbonate solution; then washing with ethanol until the solution is neutral, and then filtering and drying to obtain the wood fiber.
Comparative example 2
This comparative example is essentially the same as example 3, except that the wood fibers have a length of 8 mm.
Comparative example 3
This comparative example is essentially the same as example 3, except that the wood fibers have a length of 18 mm.
Test examples
The strength of the existing recycled bricks without fiber reinforcement, the recycled bricks prepared in the above examples and comparative examples after 28d curing is tested according to the national standard of basic mechanical property test method for brickwork (GBJ 129-90), and the test results are shown in Table 1. When testing, 5 samples of each example were tested, and the average was taken as the test result.
TABLE 1 test results
As can be seen from Table 1, the compression strength and the flexural strength of the bricks of examples 1 to 6 of the present invention are significantly higher than those of the comparative example and the existing bricks. Comparative example 1, since the wood fiber was not treated with the treating fluid, the compressive strength and the flexural strength were remarkably decreased due to poor fusion of the added wood fiber with the matrix and low interfacial bonding strength. The compressive strength of comparative example 2 and comparative example 3 was less affected, but the reduction in flexural strength was significant, indicating that the length of the wood fiber had a greater effect on the flexural strength.
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 invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The recycled brick prepared from building wastes is characterized by being prepared from the following raw materials: 100 parts of building waste aggregate, 10-20 parts of kaolin, 30-50 parts of fly ash, 1-5 parts of water reducing agent, 1-5 parts of early strength agent, 1-5 parts of antifreezing agent and 15-25 parts of water in parts by weight;
wherein the building waste aggregate comprises: 50-60% of heavy aggregate, 30-40% of light aggregate and 5-10% of wood fiber according to weight percentage; the heavy aggregate is derived from waste concrete, waste tiles and waste stone, the light aggregate is derived from waste ceramic and waste glass, and the wood fiber is derived from waste wood; the length of the wood fiber is 10mm-15 mm; the lightweight aggregate also comprises waste gypsum, and the mass ratio of the waste ceramic to the waste glass to the waste gypsum is 1: (0.8-1.2): (0.5-1);
the wood fiber is prepared by the following method:
step A: cleaning waste wood, and preparing a crude fiber product by a papermaking chemical mechanical pulp method;
and B: soaking the crude fiber product in alkali liquor, then washing the crude fiber product with ethanol until the solution is neutral, and then filtering and drying the solution to obtain a semi-finished fiber product; the concentration of the alkali liquor is 5wt% -10wt%, and the mass ratio of the crude fiber product to the alkali liquor is 1: (30-40), wherein the alkali liquor is one or a combination of more of potassium hydroxide solution, sodium hydroxide solution and sodium bicarbonate solution; the soaking conditions of the crude fiber product in alkali liquor are as follows: soaking for 8-12 h at 25-35 ℃;
and C: soaking the semi-finished fiber product in a treatment solution, filtering and drying to obtain wood fiber; wherein the mass ratio of the fiber semi-finished product to the treatment liquid is 1: (5-8), wherein the treatment liquid comprises 5-8 parts by weight of sodium lauryl sulfate, 1-3 parts by weight of methyl eleostearate anhydride, 4-6 parts by weight of hydroxyethyl cellulose and 70-80 parts by weight of acetone; the soaking conditions are as follows: ultrasonic treatment is carried out for 2h-3h at the temperature of 80-120 ℃.
2. The recycled brick produced from construction waste according to claim 1, wherein the weight ratio of waste concrete, waste brick and tile and waste stone in the heavy aggregate is 1: (0.5-1): (0.5-1).
3. The method for preparing a recycled brick from construction waste according to any one of claims 1 to 2, wherein the construction waste aggregate, kaolin, fly ash, a water reducing agent, an early strength agent, an anti-freezing agent and water are mixed and stirred uniformly, the mixture is cured under the conditions that the temperature is 20 ℃ to 25 ℃ and the ambient humidity is more than 85% after compression molding, and the recycled brick is obtained after the curing is finished.
4. The method for manufacturing recycled bricks made of construction wastes according to claim 3, wherein the mixing is performed by continuously stirring in a clockwise or counterclockwise direction for 20min to 30min and then stirring in a clockwise and counterclockwise alternating manner for 45min to 60 min.
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| CN201910271680.3A CN109776041B (en) | 2019-04-04 | 2019-04-04 | Recycled brick prepared from building waste and preparation method thereof |
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| CN112851241A (en) * | 2021-01-25 | 2021-05-28 | 盐城盛州禾润再生资源有限公司 | Construction waste regeneration brick and preparation method thereof |
| CN113402230B (en) * | 2021-07-14 | 2023-03-31 | 郑州大学 | Broken brick waste glass aggregate concrete for expanded pile and preparation method thereof |
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| KR101575791B1 (en) * | 2013-06-21 | 2015-12-09 | 서울특별시 | Soil Concrete Composition |
| CN107285722A (en) * | 2017-06-30 | 2017-10-24 | 铜陵丰泽建材科技有限公司 | A kind of preparation method for being difficult hollowing autoclave aerated concrete building block |
| CN107793118A (en) * | 2017-10-20 | 2018-03-13 | 桂林市春晓环保科技有限公司 | A kind of castoff regenerative brick and preparation method thereof |
| CN108516765A (en) * | 2018-04-27 | 2018-09-11 | 福建建中建设科技股份有限公司 | A kind of riverway sludge is non-burning brick and preparation method thereof |
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2019
- 2019-04-04 CN CN201910271680.3A patent/CN109776041B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102206917A (en) * | 2011-03-29 | 2011-10-05 | 中国林业科学研究院林产化学工业研究所 | Method for manufacturing methyl malei-eleostearate anhydride modified wood fiber |
| KR101575791B1 (en) * | 2013-06-21 | 2015-12-09 | 서울특별시 | Soil Concrete Composition |
| CN107285722A (en) * | 2017-06-30 | 2017-10-24 | 铜陵丰泽建材科技有限公司 | A kind of preparation method for being difficult hollowing autoclave aerated concrete building block |
| CN107793118A (en) * | 2017-10-20 | 2018-03-13 | 桂林市春晓环保科技有限公司 | A kind of castoff regenerative brick and preparation method thereof |
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