CN111958813A - Assembled composite board with industrial waste residue puffing material as core material and preparation method thereof - Google Patents
Assembled composite board with industrial waste residue puffing material as core material and preparation method thereof Download PDFInfo
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- CN111958813A CN111958813A CN202010887688.5A CN202010887688A CN111958813A CN 111958813 A CN111958813 A CN 111958813A CN 202010887688 A CN202010887688 A CN 202010887688A CN 111958813 A CN111958813 A CN 111958813A
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- China
- Prior art keywords
- industrial waste
- waste residue
- parts
- preparation
- composite board
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- 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
- C04B28/30—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 magnesium cements or similar cements
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
- E04C2/044—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of concrete
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
- E04C2/06—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres reinforced
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses an assembled composite board taking industrial waste residue puffing materials as core materials and a preparation method thereof, wherein the preparation method comprises the following steps: cutting the industrial waste residue puffed material into cuboid core materials with corresponding sizes; manufacturing a steel wire net frame around the core material, wherein the distance between each surface of the core material and the corresponding net frame is 1-1.5 cm; placing a core material with a steel wire mesh frame in a mold, wherein the distance between each surface of the steel wire mesh frame and the inner wall of the mold is 1-2 cm; pouring mortar into a mold, and solidifying and molding to obtain the fabricated composite board; the preparation method can prepare the industrial waste residue into the fabricated composite board, realizes the resource utilization of the industrial waste residue, reduces the manufacturing cost of the fabricated composite board, and simultaneously, the fabricated composite board prepared by the preparation method has higher mechanical strength.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an assembled composite board taking an industrial waste residue puffing material as a core material and a preparation method thereof.
Background
The long-term storage of the solid wastes of the industrial waste residues not only occupies a large amount of land, but also causes serious pollution and harm to a water system and the atmosphere. As a result of the accumulation of large amounts of mining debris, large pieces of farmland and forest zones are destroyed. The industrial harmful slag is stockpiled for a long time, and soluble components permeate downwards from the ground surface along with water after being dissolved by rain and snow. Transferring and transforming to soil, enriching harmful substances, acidifying, alkalifying and hardening soil near a storage yard, and even generating heavy metal type pollution.
China has vigorously popularized fabricated buildings, but due to the problems of material cost, construction process, material performance and other factors, the market popularization progress of fabricated buildings is slow, and building materials with excellent performance, convenient construction and low cost are urgently needed.
Disclosure of Invention
The invention aims to provide a preparation method of an assembly type composite board with an industrial waste residue puffing material as a core material, the preparation method can be used for preparing the industrial waste residue into the assembly type composite board, the resource utilization of the industrial waste residue is realized, the manufacturing cost of the assembly type composite board is reduced, and the assembly type composite board prepared by the preparation method has high mechanical strength and good performance index.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a preparation method of an assembled composite board taking industrial waste residue puffing materials as core materials, which comprises the following steps:
(a) cutting the industrial waste residue puffed material into cuboid core materials with corresponding sizes;
(b) manufacturing a steel wire net frame around the core material, wherein the distance between each surface of the core material and the corresponding net frame is 1-1.5 cm;
(c) placing a core material with a steel wire mesh frame in a mold, wherein the distance between each surface of the steel wire mesh frame and the inner wall of the mold is 1-2 cm;
(d) and pouring the mortar into a mold, and solidifying and molding to obtain the fabricated composite board.
Preferably, the industrial residue bulking material is prepared by the following method:
crushing industrial waste residues to obtain industrial waste residue particles;
mixing 13-16 parts of industrial waste residue particles, 5-8 parts of water, 0.5-1 part of anhydrous magnesium chloride, 1-2 parts of sodium bicarbonate, 1-2 parts of potassium hydrogen tartrate and 1-3 parts of light calcined powder to obtain a mixture;
and adding 3-5 parts of foaming agent into the mixture, and processing to obtain the industrial waste residue expanded material.
Preferably, each part of the industrial waste residue particles comprises 3 parts of industrial waste residue with the particle size of 0.1-0.5 mm, 10 parts of industrial waste residue with the particle size of 0.01-0.1 mm and 6 parts of industrial waste residue with the particle size of 0.001-0.1 mm.
According to the invention, the industrial waste residues with different particle sizes are mixed according to a specific proportion to reach a proper gradation, so that the compression strength and other properties of the industrial waste residue puffing material can be enhanced; and the prepared fabricated composite board has excellent mechanical properties.
Preferably, the industrial waste residue is at least one of fly ash, manganese residue and phosphogypsum.
Preferably, the diameter of the steel wire adopted by the steel wire mesh frame is 2-5 mm.
Preferably, the steel wire net frame is formed by weaving steel wires at intervals of 2-5 cm.
Preferably, the mortar is M10 or M20 mortar.
The second aspect of the invention provides an assembled composite board with industrial waste residue puffing material as a core material, and the assembled composite board is prepared by the preparation method.
Compared with the prior art, the invention has the beneficial effects that at least:
the preparation method can prepare the industrial waste residue into the fabricated composite board, realizes the resource utilization of the industrial waste residue, reduces the manufacturing cost of the fabricated composite board, and simultaneously, the fabricated composite board prepared by the preparation method has higher mechanical strength.
According to the invention, the particle size of the industrial waste residue and the selection of the raw materials enable the prepared industrial waste residue expanded material to have excellent mechanical strength, so that the prepared fabricated composite board has excellent mechanical properties.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the following embodiments. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1
The embodiment is a preparation method of an assembly type composite board taking industrial waste residue puffing materials as core materials, which comprises the following steps:
(a) cutting the industrial waste residue expanded material into cuboid core materials with the length of 60cm, the height of 70cm and the thickness of 14 cm;
(b) manufacturing a steel wire net frame around the core material, wherein the distance between each surface of the core material and the corresponding net frame is 1 cm;
(c) placing a core material with a steel wire mesh frame in a mold, wherein the distance between each surface of the steel wire mesh frame and the inner wall of the mold is 2cm, and the steel wire mesh frame is formed by weaving steel wires with the diameter of 2mm at the interval of 2 cm;
(d) pouring M10 mortar into a mold, and solidifying and molding to obtain an assembled composite board;
wherein, the industrial waste residue puffing material is prepared by the following method:
crushing industrial waste residues to obtain industrial waste residue particles;
mixing 13 parts of industrial waste residue particles, 5 parts of water, 1 part of anhydrous magnesium chloride, 1 part of sodium bicarbonate, 2 parts of potassium hydrogen tartrate and 1 part of light burning powder to obtain a mixture, wherein each part of the industrial waste residue particles comprises 3 parts of industrial waste residue with the particle size of 0.1-0.5 mm, 10 parts of industrial waste residue with the particle size of 0.01-0.1 mm and 6 parts of industrial waste residue with the particle size of 0.001-0.1 mm;
adding 3 parts of foaming agent into the mixture, and processing to obtain an industrial waste residue expanded material;
the industrial waste residue is fly ash.
Example 2
The embodiment is a preparation method of an assembly type composite board taking industrial waste residue puffing materials as core materials, which comprises the following steps:
(a) cutting the industrial waste residue expanded material into cuboid core materials with the length of 60cm, the height of 70cm and the thickness of 14 cm;
(b) manufacturing a steel wire net frame around the core material, wherein the distance between each surface of the core material and the corresponding net frame is 1.5 cm;
(c) placing a core material with a steel wire mesh frame in a mold, wherein the distance between each surface of the steel wire mesh frame and the inner wall of the mold is 1cm, and the steel wire mesh frame is formed by weaving steel wires with the diameter of 5mm at the interval of 5 cm;
(d) pouring M20 mortar into a mold, and solidifying and molding to obtain an assembled composite board;
wherein, the industrial waste residue puffing material is prepared by the following method:
crushing industrial waste residues to obtain industrial waste residue particles;
mixing 16 parts of industrial waste residue particles, 8 parts of water, 0.5 part of anhydrous magnesium chloride, 2 parts of sodium bicarbonate, 1 part of potassium hydrogen tartrate and 3 parts of light burning powder to obtain a mixture, wherein each part of the industrial waste residue particles comprises 3 parts of industrial waste residue with the particle size of 0.1-0.5 mm, 10 parts of industrial waste residue with the particle size of 0.01-0.1 mm and 6 parts of industrial waste residue with the particle size of 0.001-0.1 mm;
5 parts of foaming agent is added into the mixture, and then the mixture is processed to obtain the industrial waste residue expanded material;
the industrial waste residue is manganese residue.
Example 3
The embodiment is a preparation method of an assembly type composite board taking industrial waste residue puffing materials as core materials, which comprises the following steps:
(a) cutting the industrial waste residue expanded material into cuboid core materials with the length of 60cm, the height of 70cm and the thickness of 14 cm;
(b) manufacturing a steel wire net frame around the core material, wherein the distance between each surface of the core material and the corresponding net frame is 1 cm;
(c) placing a core material with a steel wire mesh frame in a mold, wherein the distance between each surface of the steel wire mesh frame and the inner wall of the mold is 1cm, and the steel wire mesh frame is formed by weaving steel wires with the diameter of 3mm at the interval of 4 cm;
(d) pouring M20 mortar into a mold, and solidifying and molding to obtain an assembled composite board;
wherein, the industrial waste residue puffing material is prepared by the following method:
crushing industrial waste residues to obtain industrial waste residue particles;
mixing 15 parts of industrial waste residue particles, 6 parts of water, 0.8 part of anhydrous magnesium chloride, 1.5 parts of sodium bicarbonate, 1.5 parts of potassium hydrogen tartrate and 2 parts of light burning powder to obtain a mixture, wherein each part of the industrial waste residue particles comprises 3 parts of industrial waste residue with the particle size of 0.1-0.5 mm, 10 parts of industrial waste residue with the particle size of 0.01-0.1 mm and 6 parts of industrial waste residue with the particle size of 0.001-0.1 mm;
adding 4 parts of foaming agent into the mixture, and processing to obtain an industrial waste residue expanded material;
the industrial waste residue is fly ash.
Comparative example 1
The comparative example is a preparation method of a fly ash puffed material, which is basically the same as the preparation method of the fly ash puffed material in example 3, and is different in that fly ash waste residues with the particle size of 0.01-0.1 mm are replaced by equal parts by weight of fly ash waste residues with the particle size of 0.1-0.5 mm.
Examples of the experiments
Respectively obtaining the industrial waste residue puffed materials prepared in the embodiments 1 to 3 and the comparative example 1 of the invention, and testing the compression resistance of each material according to the method in JGJ 169-2009; the test results are shown in table 1:
TABLE 1
As can be seen from table 1, it is,
according to the invention, the industrial waste residues with different particle sizes are reasonably proportioned, so that the compressive strength of the industrial waste residue puffing material can be better improved, and the mechanical strength of the fabricated composite board can be further improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (8)
1. A preparation method of an assembled composite board taking industrial waste residue puffing materials as core materials is characterized by comprising the following steps:
(a) cutting the industrial waste residue puffed material into cuboid core materials with corresponding sizes;
(b) manufacturing a steel wire net frame around the core material, wherein the distance between each surface of the core material and the corresponding net frame is 1-1.5 cm;
(c) placing a core material with a steel wire mesh frame in a mold, wherein the distance between each surface of the steel wire mesh frame and the inner wall of the mold is 1-2 cm;
(d) and pouring the mortar into a mold, and solidifying and molding to obtain the fabricated composite board.
2. The method of claim 1, wherein the industrial residue bulking material is produced by a process comprising:
crushing industrial waste residues to obtain industrial waste residue particles;
mixing 13-16 parts of industrial waste residue particles, 5-8 parts of water, 0.5-1 part of anhydrous magnesium chloride, 1-2 parts of sodium bicarbonate, 1-2 parts of potassium hydrogen tartrate and 1-3 parts of light calcined powder to obtain a mixture;
and adding 3-5 parts of foaming agent into the mixture, and processing to obtain the industrial waste residue expanded material.
3. The preparation method according to claim 2, wherein each part of the industrial waste residue particles comprises 3 parts of industrial waste residue with the particle size of 0.1-0.5 mm, 10 parts of industrial waste residue with the particle size of 0.01-0.1 mm and 6 parts of industrial waste residue with the particle size of 0.001-0.1 mm.
4. The preparation method according to claim 2, wherein the industrial waste residue is at least one of fly ash, manganese residue and phosphogypsum.
5. The preparation method according to claim 1, wherein the diameter of the steel wire adopted by the steel wire mesh frame is 2-5 mm.
6. The preparation method of claim 1, wherein the steel wire mesh frame is formed by weaving steel wires at intervals of 2-5 cm.
7. The method of claim 1, wherein the mortar is M10 or M20 mortar.
8. An assembly type composite board with an industrial waste residue puffing material as a core material is characterized by being prepared by the preparation method of any one of embodiments 1-7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010887688.5A CN111958813A (en) | 2020-08-28 | 2020-08-28 | Assembled composite board with industrial waste residue puffing material as core material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010887688.5A CN111958813A (en) | 2020-08-28 | 2020-08-28 | Assembled composite board with industrial waste residue puffing material as core material and preparation method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0673840A (en) * | 1992-08-28 | 1994-03-15 | Misawa Homes Co Ltd | Manufacture of decorative laminated column |
| CN1277946A (en) * | 2000-04-14 | 2000-12-27 | 韩秀平 | Light wt. slab with inner steel wire net frame, and mfg. method therefor |
| CN102515824A (en) * | 2011-11-30 | 2012-06-27 | 南京航空航天大学 | Super-light foam cement concrete and preparation method thereof |
| CN103408321A (en) * | 2013-06-09 | 2013-11-27 | 东南大学 | Styrene foam particle-magnesium oxychloride cement composite heat insulation material and preparation method thereof |
| CN204753959U (en) * | 2015-01-06 | 2015-11-11 | 黔西宏大科技环保建材有限公司 | Steel mesh frame cement battenboard |
| CN107244942A (en) * | 2017-07-17 | 2017-10-13 | 吴蕴仪 | A kind of environmental protection composite board core of high intensity and preparation method thereof |
| CN109505409A (en) * | 2019-01-11 | 2019-03-22 | 王修水 | Architectural design steel construction trailing |
-
2020
- 2020-08-28 CN CN202010887688.5A patent/CN111958813A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0673840A (en) * | 1992-08-28 | 1994-03-15 | Misawa Homes Co Ltd | Manufacture of decorative laminated column |
| CN1277946A (en) * | 2000-04-14 | 2000-12-27 | 韩秀平 | Light wt. slab with inner steel wire net frame, and mfg. method therefor |
| CN102515824A (en) * | 2011-11-30 | 2012-06-27 | 南京航空航天大学 | Super-light foam cement concrete and preparation method thereof |
| CN103408321A (en) * | 2013-06-09 | 2013-11-27 | 东南大学 | Styrene foam particle-magnesium oxychloride cement composite heat insulation material and preparation method thereof |
| CN204753959U (en) * | 2015-01-06 | 2015-11-11 | 黔西宏大科技环保建材有限公司 | Steel mesh frame cement battenboard |
| CN107244942A (en) * | 2017-07-17 | 2017-10-13 | 吴蕴仪 | A kind of environmental protection composite board core of high intensity and preparation method thereof |
| CN109505409A (en) * | 2019-01-11 | 2019-03-22 | 王修水 | Architectural design steel construction trailing |
Non-Patent Citations (2)
| Title |
|---|
| 中国菱镁行业协会组: "《镁质胶凝材料及制品技术》", 31 January 2016, 中国建材工业出版社 * |
| 廖国胜: "《土木工程材料 第2版》", 31 January 2018, 冶金工业出版社 * |
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