CN114853394A - High-ductility geopolymer composite material and preparation method thereof - Google Patents
High-ductility geopolymer composite material and preparation method thereof Download PDFInfo
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- CN114853394A CN114853394A CN202210316557.0A CN202210316557A CN114853394A CN 114853394 A CN114853394 A CN 114853394A CN 202210316557 A CN202210316557 A CN 202210316557A CN 114853394 A CN114853394 A CN 114853394A
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- 239000002131 composite material Substances 0.000 title claims abstract description 24
- 229920000876 geopolymer Polymers 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000011449 brick Substances 0.000 claims abstract description 48
- 239000004576 sand Substances 0.000 claims abstract description 44
- 239000000835 fiber Substances 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 21
- 239000010881 fly ash Substances 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002699 waste material Substances 0.000 claims abstract description 14
- 239000012190 activator Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000004927 clay Substances 0.000 claims abstract description 6
- 238000007580 dry-mixing Methods 0.000 claims abstract description 4
- 238000012216 screening Methods 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 41
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 239000006004 Quartz sand Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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Classifications
-
- 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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a high-ductility geopolymer composite material and a preparation method thereof, wherein the composite material comprises, by mass, 100-130 parts of fly ash, 0-30 parts of slag powder, 66-76 parts of an alkaline activator, 2.5-3.1 parts of fiber, 10-40 parts of fine brick sand and 40-56 parts of water; the fine brick sand is prepared by crushing and screening one or more of waste clay bricks, shale bricks and sintered gangue bricks; when in preparation, firstly, raw materials are weighed; then, dry-mixing the fly ash and the slag powder in a stirrer; then adding an alkaline activator, water and the wet fine brick sand and stirring; then adding fiber and stirring; finally, the mold is filled, and after 24 hours, the mold is removed and sealed and cured at standard temperature for 28 days. The invention utilizes the construction waste and renewable resources as raw materials, has low cost and is green and environment-friendly; the preparation method is simple and has low energy consumption.
Description
Technical Field
The invention relates to a building material, in particular to a high-ductility geopolymer composite material and a preparation method thereof.
Background
High Ductility cement-based composite materials (HDCC for short) are novel fiber-reinforced cement-based materials prepared from cement, mineral admixtures, aggregates, fibers, admixtures and the like as raw materials. Under the action of uniaxial tensile load, the ultimate elongation of the HDCC exceeds 0.5%, the cracks are expanded in a stable state to form a multi-crack cracking mode, the average crack width is usually less than 100 mu m, and the HDCC can be applied to engineering structures such as bridge deck shrinkage connecting plates, repairing and reinforcing, anti-seismic members, tunnel linings, high-rise building connecting beams and the like, and effectively solves the problem of poor tensile property of common concrete. However, the cement clinker consumption of the HDCC is 2-3 times higher than that of common concrete, and the energy consumption and the carbon dioxide emission are increased.
CN112341053A discloses a high ductility geopolymer and a preparation method thereof, which is prepared by mixing and calcining fly ash, portland cement, calcined metakaolin, silica powder, quartz sand, an excitant and the like, and then mixing water and fibers. On the other hand, in the process of building and demolishing solid buildings in China, a large amount of waste concrete and waste bricks are generated, wherein the waste amount of the bricks accounts for more than 50% of the total amount of the building garbage, and the conventional landfill causes pollution to the environment. The geopolymer takes industrial waste residues as a main raw material, the production and preparation process is simple, single grinding is carried out, high-temperature calcination is not needed, the emission of CO2 and harmful gas can be reduced, the consumption of nonrenewable resources such as limestone and clay is avoided, and the energy consumption is about 1/2-1/3 of that of portland cement.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a low-cost environment-friendly high-ductility geopolymer composite material, and the second aim of the invention is to provide a preparation method of the high-ductility geopolymer composite material with simple process and low energy consumption.
The technical scheme is as follows: the high-ductility geopolymer composite material comprises, by mass, 100-130 parts of fly ash, 0-30 parts of slag powder, 66-76 parts of an alkaline activator, 2.5-3.1 parts of fibers, 10-40 parts of fine brick sand and 40-56 parts of water; the fine brick sand is prepared by crushing and screening one or more of waste clay bricks, shale bricks and sintered gangue bricks.
The fly ash is F or C, the F and C are different in oxide content, the F calcium oxide is low in ductility and the C calcium oxide is high in tensile strength. The slag powder is classified into 95 grades or 105 grades, the 95 grades and the 105 grades are also different in oxide content, and the high content of the 105 grades of calcium oxide is beneficial to the strength. The invention has simple formula, adopts geopolymer fly ash and slag powder to carry out alkaline excitation to replace the traditional portland cement as a glue material, uses fine brick sand as a regeneration aggregate to replace quartz sand, and can meet the requirement of a high-ductility composite material on the tensile property. The fine brick sand is derived from waste bricks dismantled and built in buildings, and other raw materials are mostly renewable resources, so that the cost is low; while meeting the use requirement of civil engineering in tensile property, compared with the use of silicate cement and quartz sand aggregate, the addition of geopolymer material and fine brick sand realizes the cyclic utilization of building and industrial wastes, avoids resource waste and environmental pollution, and is green and environment-friendly.
Further, the high-ductility geopolymer composite material also comprises 10-40 parts of river sand. In the technical scheme, river sand and fine brick sand are used as the regenerated aggregate, and the river sand is also easily obtained and has low cost.
Furthermore, the river sand has the particle size of 0.097-1.2 mm and the fineness modulus of 1.34-1.40.
Furthermore, the particle size of the fine brick sand is 0.097-1.2 mm, and the adoption of relatively thick fine brick sand is beneficial to the generation of high ductility of the material, because the fine brick sand is not bent and consumes lower energy when the bending crack in the matrix is expanded; the fineness modulus of the fine brick sand is 1.48-1.54, the saturated water absorption is 32% -38%, the existence of the high water absorption porous fine brick sand can reduce the compactness of an interface transition region of aggregate and slurry, the fracture toughness of the matrix can be controlled, so that the crack resistance, ductility and multi-crack cracking of the matrix can be greatly improved by the fiber, and the full play of the fiber bridging effect is facilitated.
Further, the alkali activator is liquid water glass mixed with sodium hydroxide, the modulus range is 1.4-1.8, the solid content is 40%, and cooling is needed for more than 4 hours before use. In the mixed excitant of liquid water glass and sodium hydroxide, the modulus is different, and the tensile strength and ductility are influenced by the large difference between the alkali amount and the silicon dioxide content.
Furthermore, the fiber is polyvinyl alcohol fiber, and the length of the fiber is 8-12 mm. The equivalent diameter of the polyvinyl alcohol fiber is 24-39 mu m, the ultimate elongation is 8-10%, the elastic modulus is 30-32 GPa, and the tensile strength is more than 1200 Mpa.
The invention also provides a preparation method of the high-ductility geopolymer composite material, which comprises the following steps:
(1) weighing the raw materials in parts by weight;
(2) dry-mixing the fly ash and the slag powder in a stirrer;
(3) adding an alkaline activator, water and the wet fine brick sand and stirring;
(4) adding fibers and stirring;
(5) the mold is filled, and after 24 hours, the mold is removed and sealed and cured at standard temperature for 28 days.
Wherein in the step (2), the rotating speed of the stirrer is 135-145 r/min, and the stirring time is 1-2 min; in the steps (3) and (4), the rotating speed of the stirrer is 140-295 revolutions per minute; in the step (3), stirring for 2-3 minutes; in the step (4), the stirring time is 2-3 minutes, so that the fibers are uniformly dispersed.
Preferably, in step (3), the fine brick sand is wetted with the amount of water required for saturation of water absorption for at least 30 minutes. The pre-wetting of the fine brick sand is to prevent the dry fine brick sand from absorbing the excitant, which would be absorbed by the dry fine brick sand, to be detrimental to the reaction of the fly ash and the slag powder. The preparation method of the invention has simple operation, no need of calcination and low energy consumption.
Further, in the step (2), river sand is added and stirred together with the fly ash and the slag powder.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: (1) the construction waste and the renewable resources are used as raw materials, so that the cost is low, and the environment is protected; (2) the preparation method is simple and has low energy consumption.
Drawings
FIG. 1 is a graph of uniaxial tensile stress-strain for the composite of example 1;
FIG. 2 is a graph of uniaxial tensile stress-strain for the composite of example 2;
FIG. 3 is a uniaxial tensile stress-strain plot of the composite of example 3;
FIG. 4 is a graph of uniaxial tensile stress-strain for the composite of example 4.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1
(1) Weighing raw materials: 125 parts of class C fly ash, 70 parts of 1.8 modulus alkaline activator, 48.9 parts of water, 18.8 parts of river sand, 17.3 parts of waste fine clay brick sand and 2.5 parts of fiber;
(2) dry-mixing the fly ash and the sand in a stirrer for 1-2 minutes, wherein the rotation frequency of blades of the stirrer is 140 revolutions per minute;
(3) adding an alkaline excitant, water and the wet fine brick sand and stirring for 3 minutes; stirring at 140 rpm for 1 minute, and then at 285 rpm for 2 minutes;
(4) adding fibers and stirring for 2 minutes, wherein the rotation frequency of a blade of a stirrer is 285 rpm;
(5) and (5) filling the mold, removing the mold after 24 hours, and sealing and maintaining at the standard temperature for 28 days.
Example 2
(1) Weighing raw materials: 100 parts of F-grade fly ash, 25 parts of 95-grade slag powder, 74 parts of 1.4-modulus alkaline activator, 55.2 parts of water, 35 parts of waste fine clay brick sand and 2.7 parts of fiber;
(2) the fly ash and the slag powder are dry-mixed in a mixer for 1-2 minutes, and the rotation frequency of a blade of the mixer is 140 revolutions per minute;
(3) adding an alkaline excitant, water and the wet fine brick sand and stirring for 3 minutes; stirring at 140 rpm for 1 minute, and then at 285 rpm for 2 minutes;
(4) adding fibers and stirring for 2 minutes, wherein the autorotation frequency of a blade of the stirrer is 285 rpm;
(5) and (5) filling the mold, removing the mold after 24 hours, and sealing and maintaining at the standard temperature for 28 days.
Example 3
(1) Weighing raw materials: 100 parts of F-grade fly ash, 25 parts of 95-grade slag powder, 74 parts of 1.4-modulus alkaline activator, 55.2 parts of water, 35 parts of waste fine shale brick sand and 2.7 parts of fiber;
(2) the fly ash and the slag powder are dry-mixed in a mixer for 1-2 minutes, and the rotation frequency of a blade of the mixer is 140 revolutions per minute;
(3) adding an alkaline excitant, water and the wet fine brick sand and stirring for 3 minutes; stirring at 140 rpm for 1 minute, and then at 285 rpm for 2 minutes;
(4) adding fibers and stirring for 2 minutes, wherein the autorotation frequency of a blade of the stirrer is 285 rpm;
(5) and (5) filling the mold, removing the mold after 24 hours, and sealing and maintaining at the standard temperature for 28 days.
Example 4:
(1) weighing raw materials: 100 parts of F-grade fly ash, 25 parts of 95-grade slag powder, 74 parts of 1.4-modulus alkaline activator, 55.2 parts of water, 35 parts of waste fine sintered coal gangue brick sand and 2.7 parts of fiber;
(2) the fly ash and the slag powder are dry-mixed in a mixer for 1-2 minutes, and the rotation frequency of a blade of the mixer is 140 revolutions per minute;
(3) adding an alkaline excitant, water and the wet fine brick sand and stirring for 3 minutes; stirring at 140 rpm for 1 minute, and then at 285 rpm for 2 minutes;
(4) adding fibers and stirring for 2 minutes, wherein the autorotation frequency of a blade of the stirrer is 285 rpm;
(5) and (5) filling the mold, removing the mold after 24 hours, and sealing and maintaining at the standard temperature for 28 days.
The difference between the example 1 and the example 2 is the modulus of the excitant, the amount of slag powder and the amount of fine brick sand; the low modulus excitant has high alkalinity, the slag powder contains high calcium oxide content and high-doped fine brick sand, the interface friction is improved when the fiber is pulled out, and the tensile stress and the strain are reduced.
Example 2, example 3 and example 4 differ by the type of fine brick sand; because the finer parts in different sintered brick sands have potential activity, the sintered brick sands can be used as aggregates and can also have geological polymerization reaction with an alkali activator, thereby improving the tensile stress value and reducing the strain.
Claims (8)
1. A high ductility geopolymer composite characterized by: the composite material comprises, by mass, 100-130 parts of fly ash, 0-30 parts of slag powder, 66-76 parts of an alkaline activator, 2.5-3.1 parts of fiber, 10-40 parts of fine brick sand and 40-56 parts of water; the fine brick sand is prepared by crushing and screening one or more of waste clay bricks, shale bricks and sintered gangue bricks.
2. A high ductility geopolymer composite as claimed in claim 1, characterized in that: and 10-40 parts of river sand.
3. A high ductility geopolymer composite according to claim 2, characterized in that: the river sand has the grain diameter of 0.097-1.2 mm and the fineness modulus of 1.34-1.40.
4. The high ductility geopolymer composite as claimed in claim 1, characterized in that: the grain diameter of the fine brick sand is 0.097-1.2 mm, and the fineness modulus is 1.48-1.54.
5. The high ductility geopolymer composite as claimed in claim 1, characterized in that: the alkali activator is a mixture of liquid water glass and sodium hydroxide, and the modulus ranges from 1.4 to 1.8.
6. The high ductility geopolymer composite as claimed in claim 1, characterized in that: the fiber is polyvinyl alcohol fiber, and the length of the fiber is 8-12 mm.
7. A method for preparing a high-ductility geopolymer composite material is characterized by comprising the following steps: the method comprises the following steps:
(1) weighing the raw materials according to claim 2;
(2) dry-mixing the fly ash and the slag powder in a stirrer;
(3) adding an alkaline activator, water and the wetted fine brick sand and stirring;
(4) adding fibers and stirring;
(5) the mold is filled, and after 24 hours, the mold is removed and sealed and cured at standard temperature for 28 days.
8. The method of claim 7, wherein: in the step (2), river sand is added, and is stirred together with the fly ash and the slag powder.
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Cited By (5)
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| CN115594453A (en) * | 2022-11-02 | 2023-01-13 | 海南大学（Cn） | Fiber geopolymer sheet and preparation method thereof |
| CN115677275A (en) * | 2022-09-07 | 2023-02-03 | 广州公路工程集团有限公司 | Geopolymer-based bonding material for structural reinforcement and preparation method and application thereof |
| CN116023075A (en) * | 2022-12-21 | 2023-04-28 | 河北工业大学 | Method for preparing high-strength geopolymer mortar by using disposable medical mask |
| CN116354679A (en) * | 2023-06-02 | 2023-06-30 | 石家庄铁道大学 | Strain hardening type recycled coarse aggregate concrete and preparation method thereof |
| CN117550841A (en) * | 2023-11-15 | 2024-02-13 | 深圳大学 | Low-shrinkage geopolymer mortar, preparation method and application thereof, and low-shrinkage geopolymer curing mortar |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115677275A (en) * | 2022-09-07 | 2023-02-03 | 广州公路工程集团有限公司 | Geopolymer-based bonding material for structural reinforcement and preparation method and application thereof |
| CN115594453A (en) * | 2022-11-02 | 2023-01-13 | 海南大学（Cn） | Fiber geopolymer sheet and preparation method thereof |
| CN115594453B (en) * | 2022-11-02 | 2023-11-17 | 海南大学 | Fibrous geopolymer plate and preparation method thereof |
| CN116023075A (en) * | 2022-12-21 | 2023-04-28 | 河北工业大学 | Method for preparing high-strength geopolymer mortar by using disposable medical mask |
| CN116354679A (en) * | 2023-06-02 | 2023-06-30 | 石家庄铁道大学 | Strain hardening type recycled coarse aggregate concrete and preparation method thereof |
| CN116354679B (en) * | 2023-06-02 | 2023-07-25 | 石家庄铁道大学 | Strain hardening type recycled coarse aggregate concrete and preparation method thereof |
| CN117550841A (en) * | 2023-11-15 | 2024-02-13 | 深圳大学 | Low-shrinkage geopolymer mortar, preparation method and application thereof, and low-shrinkage geopolymer curing mortar |
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