CN113501684A - Light high-ductility geopolymer material and preparation method thereof - Google Patents
Light high-ductility geopolymer material and preparation method thereof Download PDFInfo
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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
- C04B28/006—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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/022—Carbon
- C04B14/026—Carbon of particular shape, e.g. nanotubes
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0641—Polyvinylalcohols; Polyvinylacetates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
- C04B18/082—Cenospheres
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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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
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Abstract
The invention discloses a light high-ductility geopolymer material and a preparation method thereof. The light high-ductility geopolymer material provided by the invention comprises the following preparation raw materials in parts by weight: 40-50 parts of fly ash; 10-15 parts of granulated blast furnace slag; 3-5 parts of higher soil; 3-5 parts of silica fume; 5-15 parts of fly ash floating beads; 1-1.5 parts of PVA fiber; 0.1-0.15 part of multi-wall carbon nano tube; 10-15 parts of deionized water; 15-20 parts of water glass; 2-4 parts of sodium hydroxide; 0.2-0.4 part of dispersant. Compared with the common geopolymer, the light high-ductility geopolymer material prepared by the invention has high strength and high toughness and is lighterAnd the like. The light high-ductility geopolymer material prepared by the method has 28d compressive strength of more than 30Mpa, tensile strain of 6 percent and volume weight of 1500kg/m3Left and right sides, can apply to fields such as engineering structure reinforcement technique.
Description
Technical Field
The invention relates to the technical field of geopolymer materials, in particular to a light high-ductility geopolymer material and a preparation method thereof.
Background
Geopolymers (Geopolymer) was originally a new alkali-activated inorganic cement proposed by French materialist Davidovits in 1976. The geopolymer is an inorganic high-molecular polymer which is formed by solid powder rich in silicon and aluminum through alkali excitation and has a three-dimensional network structure consisting of silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron. The research shows that compared with Portland cement, geopolymer has the advantages of high strength, acid resistance, high surface hardness, fire resistance, high heat stability, capacity of solidifying heavy metal, etc. However, geopolymer concrete is a brittle material with heavy self-weight, easily generates a large amount of cracks, does not meet the requirements of people on the sustainable and high performance of the novel material, and limits the application of the geopolymer concrete in engineering. Therefore, the light geopolymer material with light weight, high strength and high ductility is prepared, and has important significance for the application of the geopolymer material in practical engineering.
Disclosure of Invention
The invention aims to solve the problems of great self weight and poor toughness of the existing geopolymer concrete, and provides a light high-ductility geopolymer material and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
in a first aspect, the invention provides a light high-ductility geopolymer material, which is prepared from the following raw materials in parts by weight: 35-40 parts of fly ash; 10-15 parts of granulated blast furnace slag; 3-5 parts of higher soil; 3-5 parts of silica fume; 10-15 parts of fly ash floating beads; 1-1.5 parts of PVA fiber; 0.1-0.15 part of multi-wall carbon nano tube; 10-15 parts of water; 15-20 parts of water glass; 2-4 parts of sodium hydroxide; 0.2-0.4 part of dispersant.
As a preferred scheme, the fly ash is F-class I-grade fly ash, and the content of calcium oxide is 5% -8%.
The granulated blast furnace slag is S95 mineral powder, and the specific surface area is 400-500m2/kg。
The average particle size of the metakaolin is 100-150 nm;
SiO of the silica fume2The content is 92 percent
The fly ash floating bead is a hollow ceramic microbead with the bulk density of 0.4-0.5g/cm3The particle size range is 75-300 μm.
The length of the PVA fiber is 8-12mm, and the diameter is 10-20 μm.
The multi-wall carbon nano-tube is an industrial hydroxylated multi-wall carbon nano-tube, the length of the multi-wall carbon nano-tube is 10-30nm, and the specific surface area of the multi-wall carbon nano-tube is 150m2/g-200m2/g。
The modulus of the water glass is 3 to 3.4 initially, and the water content is 45 to 65 percent
The sodium hydroxide has a purity of greater than 95% solids.
The dispersing agent is sodium dodecyl sulfate, and the purity of the dispersing agent is more than 99 percent of solid.
In a second aspect, the present invention provides a method for preparing a lightweight high-ductility geopolymer material, characterized in that: the method comprises the following steps:
(S1) weighing the following raw materials: weighing 40-50 parts of fly ash according to parts by weight; 10-15 parts of granulated blast furnace slag; 3-5 parts of higher soil; 3-5 parts of silica fume; 5-15 parts of fly ash floating beads.
(S2) preparing a composite exciting agent: weighing 0.1-0.15 part of multi-walled carbon nano-tube by weight; 10-15 parts of water; 15-20 parts of water glass; 2-4 parts of sodium hydroxide; 0.2 to 0.4 portion of dispersant, fully stirring after mixing, and then placing into an ultrasonic cleaning machine with the temperature of 60 ℃ to shake for 30 to 40 minutes.
(S3) weighing the raw materials, pouring the raw materials into a stirrer, and stirring at a low speed for 1-2 minutes; weighing the composite excitant, adding the composite excitant into dry materials of a stirrer, and stirring at a high speed for 1-2 minutes; and weighing PVA, adding the PVA into the geopolymer slurry which is uniformly stirred, and stirring for 3-5 minutes until the fibers are uniformly dispersed.
(S4) pouring the stirred slurry into a mould, vibrating to densify, demoulding after 24 hours, and continuing to maintain for 28 days to obtain the light high-ductility geopolymer material.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention utilizes fly ash floating beads to replace quartz sand to prepare the lightweight high-ductility geopolymer material, has the advantages of small density, high strength and good ductility, and solves the defects of heavy weight and easy cracking of the traditional geopolymer material.
2. The invention utilizes PVA and multi-wall carbon nano tubes to simultaneously enhance the ductility of geopolymer, and the geopolymer material with light weight and high ductility is applied to engineering as an energy consumption material, and has higher energy absorption and deformation capacities so that the geopolymer material can be used for beams, columns, walls, beam-column joints and other parts of key parts of an earthquake-resistant structure.
3. The light high-ductility geopolymer material has the characteristics of ultrahigh toughness, light dead weight and multi-slit cracking, so that the light high-ductility geopolymer material has a wider application space in the field of civil engineering repair and reinforcement.
Drawings
FIG. 1 is a 28-day stress-strain curve of the lightweight high-ductility geopolymer material of example 1 in accordance with the present invention.
Detailed Description
The technical solution of the present invention is further explained in detail with reference to the accompanying drawings and specific embodiments.
Example 1
The embodiment provides a preparation method of a light high-ductility geopolymer, which comprises the following specific steps:
(1) weighing 50 parts of fly ash, 12 parts of granulated blast furnace slag, 3 parts of higher soil, 3 parts of silica fume and 5 parts of fly ash floating beads according to the parts by weight, pouring into a stirrer, and stirring at a low speed for 1 minute.
(2) Weighing 0.1 part of multi-walled carbon nanotube, 11.2 parts of water, 15.3 parts of water glass, 2.8 parts of sodium hydroxide and 0.27 part of dispersant by weight, mixing, fully stirring, and then placing into an ultrasonic cleaning machine with the temperature of 60 ℃ to vibrate for 30 minutes.
(3) Adding the composite excitant into the dry material of the stirrer, and stirring at high speed for 2 minutes; and weighing 1.2 parts of PVA, adding the PVA into the geopolymer slurry which is uniformly stirred, and stirring for 5 minutes until the fibers are uniformly dispersed to obtain the light high-ductility geopolymer material.
Example 2
The embodiment provides a preparation method of a light high-ductility geopolymer, which comprises the following specific steps:
(1) weighing 45 parts of fly ash, 12 parts of granulated blast furnace slag, 3 parts of higher soil, 3 parts of silica fume and 10 parts of fly ash floating beads according to the parts by weight, pouring the materials into a stirrer, and stirring the materials at a low speed for 1 minute.
(2) Weighing 0.1 part of multi-walled carbon nanotube, 11.2 parts of water, 15.3 parts of water glass, 2.8 parts of sodium hydroxide and 0.27 part of dispersant by weight, mixing, fully stirring, and then placing into an ultrasonic cleaning machine with the temperature of 60 ℃ to vibrate for 30 minutes.
(3) Adding the composite excitant into the dry material of the stirrer, and stirring at high speed for 2 minutes; and weighing 1.2 parts of PVA, adding the PVA into the geopolymer slurry which is uniformly stirred, and stirring for 5 minutes until the fibers are uniformly dispersed to obtain the light high-ductility geopolymer material.
Example 3
The embodiment provides a preparation method of a light high-ductility geopolymer, which comprises the following specific steps:
(1) weighing 40 parts of fly ash, 12 parts of granulated blast furnace slag, 3 parts of higher soil, 3 parts of silica fume and 15 parts of fly ash floating beads according to the parts by weight, pouring into a stirrer, and stirring at a low speed for 1 minute.
(2) Weighing 0.1 part of multi-walled carbon nanotube, 11.2 parts of water, 15.3 parts of water glass, 2.8 parts of sodium hydroxide and 0.27 part of dispersant by weight, mixing, fully stirring, and then placing into an ultrasonic cleaning machine with the temperature of 60 ℃ to vibrate for 30 minutes.
(3) Adding the composite excitant into the dry material of the stirrer, and stirring at high speed for 2 minutes; and weighing 1.2 parts of PVA, adding the PVA into the geopolymer slurry which is uniformly stirred, and stirring for 5 minutes until the fibers are uniformly dispersed to obtain the light high-ductility geopolymer material.
Table 1 shows the performance test results of the light high-ductility geopolymer material 28d
The light weight of the geopolymer material is realized by adopting the fly ash floating beads as a light filling material, and the ductility of the geopolymer material is improved from a microscopic and microscopic scale by using PVA and multi-wall carbon nanotubes. As shown in Table 1, the geopolymer material prepared has the characteristics of light weight, high ductility and good working performance.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-described preferred embodiment should not be construed as limiting the present invention. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (3)
1. A lightweight high ductility geopolymer material characterized by: the preparation method comprises the following raw materials in parts by weight: 40-50 parts of fly ash; 10-15 parts of granulated blast furnace slag; 3-5 parts of higher soil; 3-5 parts of silica fume; 5-15 parts of fly ash floating beads; 1-1.5 parts of PVA fiber; 0.1-0.15 part of multi-wall carbon nano tube; 10-15 parts of water; 15-20 parts of water glass; 2-4 parts of sodium hydroxide; 0.2-0.4 part of dispersant.
2. The lightweight high ductility geopolymer material according to claim 1, characterized in that: the fly ash is F class I fly ash, and the content of calcium oxide is 5-8%;
the granulated blast furnace slag is S95 mineral powder, and the specific surface area is 400-2/kg；
The metakaolin has the average particle size of 100-150 nm;
the silica fume is SiO2The content is 92%;
the fly ash floating bead is a hollow ceramic microbead with the bulk density of 0.4-0.5g/cm3Particle size range of 75-300μm；
The length of the PVA fiber is 8-12mm, and the diameter is 10-20 μm;
the multi-wall carbon nano-tube is an industrial hydroxylated multi-wall carbon nano-tube, the length of the multi-wall carbon nano-tube is 10-30nm, and the specific surface area of the multi-wall carbon nano-tube is 150m2/g-200m2/g；
The modulus of the water glass is 3-3.4, and the water content is 45% -65%;
the sodium hydroxide is more than 95% pure solid;
the dispersing agent is sodium dodecyl sulfate and solid with the purity of more than 99 percent.
3. A method for preparing a lightweight high-ductility geopolymer material as claimed in claim 1 or 2, characterized in that: the method comprises the following steps:
(S1) weighing the following raw materials: weighing 35-40 parts of fly ash according to parts by weight; 10-15 parts of granulated blast furnace slag; 3-5 parts of higher soil; 3-5 parts of silica fume; 10-15 parts of fly ash floating beads;
(S2) preparing a composite exciting agent: weighing 0.1-0.15 part of multi-walled carbon nano-tube by weight; 10-15 parts of water; 15-20 parts of water glass; 2-4 parts of sodium hydroxide; 0.2-0.4 part of dispersing agent, fully stirring after mixing, and then placing into an ultrasonic cleaning machine with the temperature of 60 ℃ to vibrate for 30-40 minutes;
(S3) weighing the raw materials, pouring the raw materials into a stirrer, and stirring at a low speed for 1-2 minutes; weighing the composite excitant, adding the composite excitant into dry materials of a stirrer, and stirring at a high speed for 1-2 minutes; weighing PVA, adding the PVA into the geopolymer slurry which is uniformly stirred, and then stirring for 3-5 minutes until the fibers are uniformly dispersed;
(S4) pouring the stirred slurry into a mould, vibrating to densify, demoulding after 24 hours, and continuing to maintain for 28 days to obtain the light high-ductility geopolymer material.
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Cited By (1)
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|---|---|---|---|---|
| CN116143457A (en) * | 2023-01-17 | 2023-05-23 | 广西大学 | Fiber reinforced slag-bagasse ash-based geopolymer material and preparation method thereof |
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| CN116143457A (en) * | 2023-01-17 | 2023-05-23 | 广西大学 | Fiber reinforced slag-bagasse ash-based geopolymer material and preparation method thereof |
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Application publication date: 20211015 |