CN114956681A - High-temperature cured low-carbon high-strength geopolymer concrete material and preparation method thereof - Google Patents
High-temperature cured low-carbon high-strength geopolymer concrete material and preparation method thereof Download PDFInfo
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- CN114956681A CN114956681A CN202210501736.1A CN202210501736A CN114956681A CN 114956681 A CN114956681 A CN 114956681A CN 202210501736 A CN202210501736 A CN 202210501736A CN 114956681 A CN114956681 A CN 114956681A
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- 229920003041 geopolymer cement Polymers 0.000 title claims abstract description 64
- 239000000463 material Substances 0.000 title claims abstract description 41
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910001868 water Inorganic materials 0.000 claims abstract description 29
- 239000012190 activator Substances 0.000 claims abstract description 23
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 21
- 239000010881 fly ash Substances 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 44
- 238000002156 mixing Methods 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 16
- 239000004115 Sodium Silicate Substances 0.000 claims description 14
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 14
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 239000002585 base Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical group O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 19
- 239000004568 cement Substances 0.000 abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000126 substance Substances 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 6
- 229920000876 geopolymer Polymers 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 238000007580 dry-mixing Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- -1 pebbles Chemical compound 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000012258 stirred mixture Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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
-
- 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/04—Alkali metal or ammonium silicate cements ; Alkyl silicate cements; Silica sol cements; Soluble silicate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
-
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
- C04B40/0245—Steam hardening, e.g. in an autoclave including a pre-curing step not involving a steam or autoclave treatment
-
- 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
-
- 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)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a low-carbon high-strength geopolymer concrete material cured at high temperature and a preparation method thereof, wherein the geopolymer concrete material is prepared by taking fly ash, slag micropowder and silica fume as binder base materials and adding coarse aggregate, fine aggregate, an alkaline activator and a water reducing agent, and the preparation method comprises the preparation of the alkaline activator; preparing geopolymer concrete mixture; pouring geopolymer concrete; and (5) after the concrete is demoulded, performing high-temperature curing and then performing standard curing. Compared with the prior art, the invention is based on low carbon, and can reduce the cement consumption, save energy and reduce carbon emission while ensuring the normal use of geopolymer concrete. The high-temperature curing can ensure that the geopolymer concrete obtains higher compressive strength in a shorter curing age, shortens the curing time, saves the time cost, is suitable for practical engineering, and meets the requirements of building safety and durability.
Description
Technical Field
The invention relates to the technical field of research and development of low-carbon energy-saving concrete materials of building materials, in particular to a low-carbon high-strength geopolymer concrete material cured at high temperature and a preparation method thereof.
Background
The traditional cement needs a manufacturing process of 'two-grinding and one-burning' in the production process, so that a large amount of energy consumption and carbon emission are generated when the cement is prepared. The energy consumption of the geopolymer in the manufacturing process is particularly low, and the production energy consumption is 1/6-1/4 of cement; CO 2 2 The discharge amount is only 1/10-1/5 of cement.
Compared with the traditional portland cement, the geopolymer concrete is a novel building material which can replace the traditional portland concrete. The geopolymer concrete has the characteristics of environmental friendliness, low production energy consumption, low pollution and the like, and is a material which accords with national energy-saving and emission-reduction plans. Due to the special reaction mechanism of the geopolymer, carbon dioxide and harmful gas are hardly generated in the preparation process, so that unfavorable emission can be reduced, the greenhouse effect can be relieved, the energy crisis can be alleviated, the living environment quality of people can be improved, and the method plays an important role in the conditions of large population base, high energy consumption and the like in China. In addition, a large amount of industrial waste is generated in the process of strengthening the foundation in the past, geopolymer concrete can be prepared by using the materials, and waste recycling is realized. The geopolymer concrete has the characteristics of low porosity and the like because calcium hydroxide crystals in the traditional cement cannot be generated in a large amount, is superior to the traditional concrete in corrosion resistance, has a low heat conductivity coefficient, and has good performance in heat insulation and fire resistance. China has less application to geopolymer concrete, is mainly used for replacing ceramics for sealing and storing nuclear waste by utilizing the characteristics of low permeability and the like of a special cage structure of the geopolymer concrete, has very less application to buildings, particularly civil buildings, and mainly has the reasons of immature technical mastery, immature industrial specifications and the like. The detailed research and the mastering of the properties of the material have great significance for improving the construction level, improving the building quality, maximizing the economic benefit and even realizing the innovation and the development of the whole civil engineering industry.
Disclosure of Invention
The invention aims to provide a low-carbon high-strength geopolymer concrete material cured at high temperature and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme: the geopolymer concrete material is characterized by being prepared by taking fly ash, slag micropowder and silica fume as binder base materials and adding coarse aggregate, fine aggregate, an alkaline activator and a water reducing agent.
Preferably, the alkaline activator comprises the following components in parts by mass: adhesive base material: fine aggregate: the coarse aggregate is 1 (2.3-2.7), (2.1-2.5), (4.3-4.7): .
Further preferably, the alkaline activator comprises the following components in parts by mass: binder base material: fine aggregate: coarse aggregate is 1:2.5:2.3: 4.5.
Preferably, the alkali activator is prepared by mixing sodium silicate solution, sodium hydroxide and water.
Further preferably, the modulus of the sodium silicate solution is 3.3, and the baume degree is 40 Be; the sodium hydroxide is pure white flaky solid with the purity of 96 percent.
Further preferably, the sodium silicate solution comprises the following components in parts by mass: sodium hydroxide: water is 1 (0.1-0.2) and 0.1-0.2.
Still more preferably, the sodium silicate solution: sodium hydroxide: water 1:0.16: 0.16.
Preferably, the modulus of the alkali-activator is 1.35.
Preferably, the water reducing agent is a naphthalene water reducing agent.
Preferably, the mixing amount of the water reducing agent is 1.5-2.5% of the fine aggregate by mass.
More preferably, the mixing amount of the water reducing agent is 2% of the fine aggregate by mass.
Preferably, the weight portion of the fly ash: slag micropowder: the silica fume is 1, (3-4), (1-2.2).
Preferably, the specification of the fly ash is class C and class II, gray powder; the specification of the slag micro powder is S95, and the ignition loss is-0.4%; the average particle size of the silica fume is 0.1-0.3 mu m.
Preferably, the fine aggregate and the coarse aggregate are both building aggregates, the fine aggregate is natural river sand, the particle size is 0-5 mm, the fineness modulus is 1.98, and the apparent density is 2621kg/m 3 Bulk density of 1415kg/m 3 (ii) a The coarse aggregate is stone for construction, the particle size is 5-16 mm, the continuous gradation is realized, and the apparent density is 2680kg/m 3 Bulk density of 1364kg/m 3 。
The preparation method of the high-temperature cured low-carbon high-strength geopolymer concrete material comprises the following steps:
(1) preparing an alkaline activator: mixing and stirring sodium silicate, sodium hydroxide and water uniformly;
(2) preparation of geopolymer concrete mixture: mixing and stirring the fly ash, the slag micro powder, the silica fume, the fine aggregate, the coarse aggregate, the alkali activator and the water reducing agent uniformly;
(3) pouring geopolymer concrete: pouring geopolymer concrete mixture;
(4) and (5) maintenance: and after pouring, curing for 24 hours at room temperature, removing the mold, then putting the mold into a high-temperature steam curing box for curing for 24 hours, and then performing standard curing.
In order to facilitate performance testing, preferably, the preparation method specifically comprises the following steps:
the method comprises the following steps: preparation of alkaline excitant
In order to eliminate the influence of temperature on the experiment, the alkali-activator was prepared one day in advance. Mixing the sodium silicate solution, the sodium hydroxide solid and water according to a mass ratio, uniformly stirring the prepared solution, and cooling to room temperature;
step two: preparation of geopolymer concrete mixture
Mixing and dry-mixing the fly ash, the slag micro powder and the silica fume according to the mass ratio, then adding the fine aggregate, the coarse aggregate and the water reducing agent according to the ratio, mixing and dry-mixing uniformly, finally adding the alkaline activator and the water while stirring, and completely stirring uniformly;
step three: cast geopolymer concrete
Pouring the stirred mixture into a concrete mold twice, paving, and putting the mold on a vibrating table for compaction;
step four: maintaining
Maintaining the test piece for 24 hours at room temperature, then removing the mold, sealing the test piece, placing the test piece in a high-temperature steam maintenance box at 80 ℃, maintaining for 24 hours at high temperature, and then performing standard maintenance;
step five: test for compressive Strength
The compressive strength of the geopolymer concrete was measured for 3 days, 7 days and 28 days after curing.
Optionally, in the second step, the water reducing agent is added after the alkaline activator is added.
Optionally, in the fourth step, the test piece is sealed and placed in a high-temperature steam curing box for curing at the high temperature of 80 ℃ for 24 hours, and then is placed under the conditions of different humidity for curing.
The concrete singly doped with the fly ash has small self-drying and drying shrinkage, needs less water, but has poor carbonization resistance; the concrete with the slag micro powder mixed singly has the advantages of small water requirement, favorable concrete strength and good carbonization resistance, but has large chemical shrinkage and self-shrinkage, large performance difference of different specific surface areas and difficult control; the single-doped silica fume can improve the strength of concrete and has excellent wear resistance, but has limited doping amount due to large water demand, low yield and high cost at present. According to the invention, the fly ash, the slag micro powder and the silica fume are added into the geopolymer concrete in different mixing ratios, and the optimal mixing ratio parameter values of the fly ash, the slag micro powder and the silica fume can be obtained according to the determined compressive strength.
Compared with the prior art, the invention has the following advantages:
1. the invention is based on low carbon, reduces the cement consumption, saves energy, reduces carbon emission and has higher strength while ensuring the normal use of geopolymer concrete, thereby meeting the requirements of safety and durability;
2. according to the invention, the geopolymer is used for replacing common cement, so that the material still has high strength under the condition of low carbon or even zero carbon;
3. the fly ash-slag micro powder-silica fume is used as a binder to replace cement, and a sodium silicate-sodium hydroxide solution is doped to serve as an alkaline activator, so that the setting time of geopolymer concrete can be shortened, and the strength of the geopolymer concrete can be improved;
4. the high-temperature curing of the invention accelerates the setting and hardening time of the binder and the alkaline activator, and can improve the compressive strength of the geopolymer concrete in a shorter curing age;
5. the method can obtain the strength development curve of each stage of geopolymer concrete according to the compressive strength measured at each age of geopolymer concrete under different curing conditions;
6. the high-temperature curing mode disclosed by the invention can improve the compressive strength of the geopolymer concrete, linearly increase the compressive strength within a certain time range, generate adverse effect on the later strength of the geopolymer concrete after high-temperature curing, and reduce the effect by increasing the standing time of the geopolymer concrete at normal temperature.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, the embodiments are implemented on the premise of the technical solutions of the present invention, and a detailed implementation manner and a specific operation process are given, it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The material used by the high-temperature cured low-carbon high-strength geopolymer concrete comprises the following components: fly ash, slag micro powder, silica fume, sand, pebbles, sodium silicate solution, sodium hydroxide, a water reducing agent and water.
The fly ash used in the invention is high-calcium class C II fly ash. The chemical composition of the fly ash is shown below.
TABLE 1 fly ash major chemical composition
| Composition (I) | SiO 2 | Al 2 O 3 | CaO | Fe 2 O 3 | TiO 2 | Loss on ignition |
| Content% | 54.76 | 24.56 | 4.85 | 6.54 | 1.85 | 2.7 |
The grade of the slag micro powder used by the invention is S95, and the specific surface area is 472m 2 Per kg, loss on ignition-0.4%. The chemical composition of the fine slag powder is shown below.
TABLE 2 superfine slag powder chemical compositions
The average particle size of the silica fume used in the invention is 0.1-0.3 μm. The chemical composition of the silica fume is shown below.
TABLE 3 silica fume main chemical composition
| Composition (I) | SiO 2 | Al 2 O 3 | CaO | MgO | Fe 2 O 3 |
| Content% | ≥98 | ≤0.7 | ≤0.2 | ≤0.5 | ≤0.6 |
The fine aggregate used in the invention is natural river sand with the particle size of 0-5 mm; the coarse aggregate is stone for construction, and the particle size is 5-16 mm.
The modulus of the sodium silicate solution used in the invention is 3.3, and the Baume degree is 40 Be; the sodium hydroxide is pure white flaky solid with the purity of 96 percent; the water reducing agent is a naphthalene water reducing agent.
Examples
The invention discloses a high-temperature cured low-carbon high-strength geopolymer concrete material, which is weighed according to the proportion of each component of the geopolymer concrete.
The preparation method of the material comprises the following steps:
the method comprises the following steps: preparation of alkaline excitant
The alkaline activator is prepared one day in advance because of a large amount of heat release in the preparation process, and is used after the alkaline activator is fully reacted and cooled. According to the sodium silicate solution: sodium hydroxide: adding sodium silicate solution into a container, adding sodium hydroxide solid and water at the same time, stirring to dissolve, and then placing at room temperature.
Step two: preparation of geopolymer concrete mixture
Cleaning and drying the sandstone in advance, putting the fly ash, the slag micro powder and the silica fume into a stirring device according to the mixing ratio in the table 4, and performing dry stirring for 2min, then adding the sand and the stones, and performing full stirring for 3min to obtain a concrete dry-mixed material; and slowly pouring the alkaline activator and the water reducing agent into the mortar, and stirring until the stones and the mortar are uniformly mixed and the consistency is proper, thereby obtaining the concrete mixture.
TABLE 4 amounts of the respective raw materials
Step three: cast geopolymer concrete
Pouring the concrete mixture into a mould twice, tamping the concrete by using a spatula and a vibrating rod in the process, troweling the surface of the concrete by using the spatula after the mould is filled, then putting the trowelled surface on a vibrating table, vibrating for 2 times, and leading out the bubbles in the concrete 120s each time.
Step four: maintaining
The test piece is sealed and kept stand for 24 hours at room temperature along with the mould, so that the later strength development of the geopolymer concrete is more stable. After demoulding, a high-temperature resistant industrial film is used for wrapping a test piece, the test piece is placed in a high-temperature steam curing box at the temperature of 80 ℃ for sealing and curing for 24 hours, and then the test piece is placed in a standard curing room at the temperature of 20 +/-2 ℃ and the relative humidity of more than 95% RH according to GB/T50081-2002 Standard on testing methods of mechanical properties of common concrete.
Step five: test for compressive Strength
The cubic compressive strength of the geopolymer concrete was measured at 3 days, 7 days and 28 days, respectively.
The concrete materials obtained in the above examples have the following compressive strength test results as shown in the following table:
TABLE 5 compressive Strength test results
| 3d/Mpa | 7d/Mpa | 28d/Mpa | |
| Example 1 | 48.9 | 81.8 | 113.7 |
| Example 2 | 62.3 | 87.0 | 117.6 |
| Example 3 | 48.3 | 89.5 | 117.8 |
| Example 4 | 54.8 | 75.2 | 107.5 |
Comparative example 1
A geopolymer concrete material is demoulded and then directly placed in a standard curing room at 20 +/-2 ℃ and relative humidity of more than 95% RH without high-temperature curing. The remaining conditions were the same as in example 1.
Comparative example 2
A geopolymer concrete material is demoulded and then directly placed in a standard curing room at 20 +/-2 ℃ and relative humidity of more than 95% RH without high-temperature curing. The remaining conditions were the same as in example 2.
Comparative example 3
A geopolymer concrete material is demoulded and then directly placed in a standard curing room at 20 +/-2 ℃ and with relative humidity of more than 95% RH without high-temperature curing. The remaining conditions were the same as in example 3.
Comparative example 4
A geopolymer concrete material is demoulded and then directly placed in a standard curing room at 20 +/-2 ℃ and relative humidity of more than 95% RH without high-temperature curing. The remaining conditions were the same as in example 4.
Comparative example 5
The geopolymer concrete material has no silica fume added into the adhesive base material. The remaining conditions were the same as in example 1.
The concrete materials obtained in the above comparative examples have the following compressive strength test results as shown in the following table:
TABLE 6 compressive Strength test results
| 3d/Mpa | 7d/Mpa | 28d/Mpa | |
| Comparative example 1 | 25.4 | 68.7 | 106.2 |
| Comparative example 2 | 29.9 | 73.1 | 108.3 |
| Comparative example 3 | 23.7 | 70.7 | 113.6 |
| Comparative example 4 | 25.8 | 61.7 | 99.2 |
| Comparative example 5 | / | / | 95.6 |
And (4) conclusion: the cubic compressive strength of the high-temperature cured low-carbon high-strength geopolymer concrete can reach 117 MPa. Under the condition of early high-temperature curing at 80 ℃, the compressive strength of the 3d cube is improved by 45-55%, the compressive strength of the 7d cube is improved by 15-25%, and the compressive strength of the 28d cube is not greatly different from that of a standard curing group. This is because the higher curing temperature allows the active ingredients in the geopolymer to react earlier with the alkaline activator, increasing the rate of formation of early hydration products and thus the compressive strength. The high-temperature curing can ensure that the geopolymer concrete obtains higher compressive strength in a shorter curing age, shortens the curing time, saves the time cost, is suitable for practical engineering, and meets the requirements of building safety and durability.
The industrial waste is used for replacing cement, so that the energy consumption and carbon emission are reduced while the normal use of the concrete is ensured; according to cubic compressive strength curves of geopolymer concrete measured according to different mixing ratios, optimal mixing ratio parameter values of the fly ash, the slag micro powder and the silica fume-based geopolymer can be obtained; by using the way of curing geopolymer concrete at high temperature, the strength of the geopolymer concrete can be improved in a short time, the project duration is shortened, and the method has obvious effect on application in practical projects.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The geopolymer concrete material is characterized by being prepared by taking fly ash, slag micropowder and silica fume as binder base materials and adding coarse aggregate, fine aggregate, an alkaline activator and a water reducing agent.
2. The high-temperature cured low-carbon high-strength geopolymer concrete material as claimed in claim 1, wherein the alkali-activator is selected from the group consisting of: adhesive base material: fine aggregate: the coarse aggregate is 1 (2.3-2.7), (2.1-2.5) and (4.3-4.7).
3. The high-temperature-cured, low-carbon, high-strength geopolymer concrete material as claimed in claim 1, wherein the alkali-activator is prepared by mixing a sodium silicate solution, sodium hydroxide and water.
4. The high-temperature-cured, low-carbon, high-strength geopolymer concrete material as claimed in claim 3, wherein said sodium silicate solution has a modulus of 3.3, a Baume degree of 40 Be; the sodium hydroxide is pure white flaky solid with the purity of 96 percent.
5. The high-temperature-cured low-carbon high-strength geopolymer concrete material as claimed in claim 3, wherein the weight ratio of the sodium silicate solution: sodium hydroxide: water is 1 (0.1-0.2) and 0.1-0.2.
6. The high-temperature cured low-carbon high-strength geopolymer concrete material as claimed in claim 1, wherein the specification of the fly ash is class C and class II, gray powder; the specification of the slag micro powder is S95, and the ignition loss is-0.4%; the average particle size of the silica fume is 0.1-0.3 mu m.
7. The high-temperature-cured low-carbon high-strength geopolymer concrete material as claimed in claim 1, wherein the mass parts of the fly ash: slag micropowder: the silica fume is 1, (3-4) and (1-2.2).
8. The high-temperature cured low-carbon high-strength geopolymer concrete material as claimed in claim 1, wherein the water reducing agent is a naphthalene water reducing agent; the mixing amount of the water reducing agent is 1.5-2.5% of the fine aggregate by mass.
9. The high-temperature cured low-carbon high-strength geopolymer concrete material as claimed in claim 1, wherein the fine aggregate and the coarse aggregate are building aggregates, the fine aggregate is natural river sand, and the particle size is 0-5 mm; the coarse aggregate is stone for construction, and the particle size is 5-16 mm continuous gradation.
10. A method for preparing a high-temperature cured low-carbon high-strength geopolymer concrete material as claimed in any one of claims 1 to 9, which comprises the following steps:
(1) preparing an alkaline activator: mixing and stirring sodium silicate, sodium hydroxide and water uniformly;
(2) preparation of geopolymer concrete mixture: mixing and stirring the fly ash, the slag micro powder, the silica fume, the fine aggregate, the coarse aggregate, the alkali activator and the water reducing agent uniformly;
(3) pouring geopolymer concrete: pouring geopolymer concrete mixture;
(4) and (5) maintenance: and after pouring, curing for 24 hours at room temperature, removing the mold, then putting the mold into a high-temperature steam curing box for curing for 24 hours, and then performing standard curing.
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| CN115403321A (en) * | 2022-09-30 | 2022-11-29 | 燕山大学 | Geopolymer concrete and preparation method thereof |
| CN115417654A (en) * | 2022-09-29 | 2022-12-02 | 涉县清漳水泥制造有限公司 | Low-carbon early-strength steam-curing prefabricated member prepared from gasified slag and preparation method |
| CN115594450A (en) * | 2022-10-25 | 2023-01-13 | 中国建筑第五工程局有限公司（Cn） | Geopolymer ceramsite light concrete and preparation method thereof |
| CN115626811A (en) * | 2022-09-05 | 2023-01-20 | 上海建工集团股份有限公司 | Precast concrete of cement-alkali activated aluminosilicate cementing system and preparation method thereof |
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| CN113773028A (en) * | 2021-08-17 | 2021-12-10 | 湖南大学 | Geopolymer concrete and preparation method thereof |
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| CN106336158A (en) * | 2016-08-02 | 2017-01-18 | 深圳海龙建筑科技有限公司 | Geopolymer concrete prefabricated part and production method thereof |
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| CN115626811A (en) * | 2022-09-05 | 2023-01-20 | 上海建工集团股份有限公司 | Precast concrete of cement-alkali activated aluminosilicate cementing system and preparation method thereof |
| CN115417654A (en) * | 2022-09-29 | 2022-12-02 | 涉县清漳水泥制造有限公司 | Low-carbon early-strength steam-curing prefabricated member prepared from gasified slag and preparation method |
| CN115403321A (en) * | 2022-09-30 | 2022-11-29 | 燕山大学 | Geopolymer concrete and preparation method thereof |
| CN115403321B (en) * | 2022-09-30 | 2023-05-19 | 燕山大学 | Geopolymer concrete and preparation method thereof |
| CN115594450A (en) * | 2022-10-25 | 2023-01-13 | 中国建筑第五工程局有限公司（Cn） | Geopolymer ceramsite light concrete and preparation method thereof |
| CN115594450B (en) * | 2022-10-25 | 2023-11-24 | 中国建筑第五工程局有限公司 | Geopolymer ceramsite lightweight concrete and preparation method thereof |
| CN116084392A (en) * | 2023-02-07 | 2023-05-09 | 东南大学 | High-thermal-conductivity low-carbon energy pile and manufacturing method thereof |
| CN116084392B (en) * | 2023-02-07 | 2023-09-15 | 东南大学 | High-thermal-conductivity low-carbon energy pile and manufacturing method thereof |
| CN116425464A (en) * | 2023-04-07 | 2023-07-14 | 西安建筑科技大学 | Geopolymer-based concrete material and preparation method thereof |
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