CN114671641A - Novel coal gangue aggregate fly ash geopolymer concrete material and preparation method thereof - Google Patents
Novel coal gangue aggregate fly ash geopolymer concrete material and preparation method thereof Download PDFInfo
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- CN114671641A CN114671641A CN202210221778.XA CN202210221778A CN114671641A CN 114671641 A CN114671641 A CN 114671641A CN 202210221778 A CN202210221778 A CN 202210221778A CN 114671641 A CN114671641 A CN 114671641A
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- 239000003245 coal Substances 0.000 title claims abstract description 66
- 229920003041 geopolymer cement Polymers 0.000 title claims abstract description 40
- 239000000463 material Substances 0.000 title claims abstract description 33
- 239000010881 fly ash Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 42
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 30
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000004568 cement Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004576 sand Substances 0.000 claims abstract description 11
- 239000004567 concrete Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims abstract 3
- 239000003513 alkali Substances 0.000 claims description 22
- 239000010883 coal ash Substances 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 13
- 239000004575 stone Substances 0.000 claims description 7
- 229920000876 geopolymer Polymers 0.000 claims description 5
- 239000012190 activator Substances 0.000 claims 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 230000002269 spontaneous effect Effects 0.000 claims 1
- 238000006467 substitution reaction Methods 0.000 abstract description 9
- 239000002910 solid waste Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 description 17
- 238000005303 weighing Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000007787 solid Substances 0.000 description 6
- 239000012257 stirred material Substances 0.000 description 6
- 239000004566 building material Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
-
- 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
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (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 provides a novel coal gangue aggregate fly ash geopolymer concrete material and a preparation method thereof. Wherein the materials are 300.5kg-473.6kg of fly ash, 25.5kg-91.6kg of cement, 209.3 kg-607.4 kg of natural river sand, 201.3kg-1219.6kg of natural macadam, 0% -80% of coal gangue substitution rate, 109.21kg-350.07kg of water glass, 26.53kg-51.34kg of NaOH solution, 200.1kg-703.4kg of coal gangue and 0.2% -2% of water reducing agent in weight of the cementing material. The working performance and strength of the novel coal gangue aggregate geopolymer concrete obtained by the invention meet the requirements of C30 concrete, and the coal gangue and the fly ash can be utilized in a large scale in the using process, so that solid wastes are reasonably utilized, and the cost of the concrete is reduced.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a coal gangue aggregate and fly ash geopolymer concrete material and a preparation method thereof.
Background
The coal gangue and the fly ash are stockpiled in the open air, so that the land is occupied, and meanwhile, serious environmental pollution is brought, such as atmosphere pollution, soil pollution and the like, when the coal gangue is spontaneously combusted, large-scale landslide and fire disasters can be caused, and gases harmful to human health can be generated additionally.
At present, the building materials most used by human in engineering are not concrete, the annual concrete yield all over the world in recent years is more than 50 hundred million tons, so that not only are a great deal of resources such as sand and stone consumed, but also huge-scale cement is consumed, and CO emitted during the cement manufacturing process2Gases can cause severe greenhouse effect and are discharged in the process of preparing geopolymersCO of2The gas is less than one fifth of that of cement, the discharge amount of toxic gas is almost zero, and the energy consumption for producing the geopolymer material is only one fourth of that for producing the cement, so the advantages of energy conservation and environmental protection make the geopolymer stand out in the field of development and use of new materials.
The coal gangue geopolymer concrete prepared by taking the coal gangue as the aggregate not only solves the problems of resource utilization and environmental protection of the coal gangue and the coal ash, but also develops the coal gangue as the aggregate, and the coal ash geopolymer cementing material is used for the concrete industry, so that the related research experience and test data are accumulated.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a coal gangue aggregate fly ash geopolymer and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following scheme:
accurately weighing the manufacturing materials, wherein the materials are 300.5-473.6kg of fly ash, 25.5-91.6kg of cement, 209.3-607.4 kg of natural river sand and 201.3-1219.6 kg of natural macadam respectively.
The coal gangue coarse aggregate adopts an isometric method substitution method, and the substitution rate is selected to be 0-80%.
The water used in the test is all from water glass, and the amount of the water glass is 109.21kg-350.07 kg.
The fly ash is F-grade fly ash, the sand is natural river sand, and the broken stone is natural broken stone and coal gangue with the particle size of 5-20 mm.
The water glass has a glass modulus of 1.4-1.7.
Further, solid NaOH is weighed and dissolved in water glass, the mixture is uniformly stirred and stands for 2 hours to prepare alkali-activated solution.
Further, the coal ash and the cement are evenly stirred, and then the coal gangue and the natural sandstone are added and continuously and evenly stirred.
Further, pouring the prepared alkali solution into the uniformly stirred material step by step, and stirring quickly when pouring the solution, so as to uniformly stir the coal gangue aggregate and the fly ash geopolymer concrete.
Further, the slump of the coal gangue aggregate geopolymer concrete and the compressive strength of 3d, 7d and 28d are tested.
Furthermore, the coal gangue aggregates are divided into 5 groups, 20 percent of the groups are used as intervals to respectively replace natural gravels to be used as coarse aggregates to prepare coal gangue aggregate and coal ash geopolymer concrete.
Table 1 shows the concrete mixing ratio.
Drawings
FIG. 1 is a graph showing the compressive strength of the novel coal gangue aggregate and fly ash geopolymer concrete of the present invention at each age.
Detailed Description
In order that the present inventive subject matter may be more readily understood, a full and complete description of the present inventive subject matter will now be rendered by reference to specific embodiments thereof, which are included merely for purposes of illustration and are not intended to limit the scope of the present inventive subject matter.
A novel coal gangue aggregate and fly ash geopolymer concrete and a preparation method thereof comprise the following steps:
example 1:
Accurately weighing the manufacturing materials, wherein the materials are as follows: 300.5kg to 473.6kg of fly ash, 25.5kg to 91.6kg of cement, 209.3 kg to 607.4kg of natural river sand, 109.21kg to 350.07kg of water glass, 26.53kg to 51.34kg of NaOH solution and 1019kg of natural macadam, wherein the coal gangue replaces the natural macadam by an isovolumetric method, and the replacement rate is 0 percent.
Weighing solid NaOH and water glass, dissolving, uniformly stirring, and standing for 2 hours to prepare an alkali-activated solution.
The fly ash, the cement, the coal gangue and the natural sandstone are uniformly stirred.
Gradually pouring the prepared alkali solution into the uniformly stirred material, and rapidly stirring when pouring the solution to uniformly stir the coal gangue geopolymer concrete.
And (4) testing the slump and the compressive strength of the geopolymer concrete.
In the test, all water is from water glass, and the alkali-activated solution is prepared by using the water glass solution.
The slump and the 28-day compressive strength of the novel coal gangue aggregate, coal ash geopolymer concrete coal gangue coarse aggregate prepared in the embodiment with the substitution rate of 0% are shown in Table 2.
Example 2:
accurately weighing the manufacturing materials, wherein the materials are as follows: 300.5kg to 473.6kg of fly ash, 25.5kg to 91.6kg of cement, 209.3 kg to 607.4kg of natural river sand, 109.21kg to 350.07kg of water glass, 26.53kg to 51.34kg of NaOH solution and 815kg of natural macadam, and coal gangue replaces the natural macadam by an isovolumetric method, wherein the replacement rate is 20 percent.
Weighing solid NaOH and water glass, dissolving, uniformly stirring, and standing for 2 hours to prepare alkali-activated solution.
The fly ash, the cement, the coal gangue and the natural sandstone are uniformly stirred.
Gradually pouring the prepared aqueous alkali into the uniformly stirred material, and rapidly stirring when pouring the aqueous alkali into the material to uniformly stir the coal gangue geopolymer concrete.
And (4) testing the slump and the compressive strength of the geopolymer concrete.
In the test, all water is from water glass, and the alkali-activated solution is prepared by using the water glass solution
The slump and 28-day compressive strength of the novel coal gangue aggregate and fly ash geopolymer concrete prepared in the embodiment with the coal gangue coarse aggregate substitution rate of 20% are shown in Table 3.
Example 3:
accurately weighing the manufacturing materials, wherein the materials are as follows: 300.5kg-473.6kg of fly ash, 25.5kg-91.6kg of cement, 209.3 kg-607.4 kg of natural river sand, 109.21kg-350.07kg of water glass, 26.53kg-51.34kg of NaOH solution and 611kg of natural broken stone, wherein the coal gangue replaces the natural broken stone by an isovolumetric method, and the replacement rate is 40%.
Weighing solid NaOH and water glass, dissolving, uniformly stirring, and standing for 2 hours to prepare an alkali-activated solution.
The fly ash, the cement, the coal gangue and the natural sandstone are evenly stirred.
Gradually pouring the prepared aqueous alkali into the uniformly stirred material, and rapidly stirring when pouring the aqueous alkali into the material to uniformly stir the coal gangue geopolymer concrete.
And (4) testing the slump and the compressive strength of geopolymer concrete.
In the test, all water is from water glass, and the alkali-activated solution is prepared by using the water glass solution
The slump and 28-day compressive strength of the novel coal gangue aggregate and fly ash geopolymer concrete prepared by the embodiment with the coal gangue coarse aggregate substitution rate of 40% are shown in Table 4.
Example 4:
accurately weighing the manufacturing materials, wherein the materials are as follows: 300.5kg-473.6kg of fly ash, 25.5kg-91.6kg of cement, 209.3 kg-607.4 kg of natural river sand, 109.21kg-350.07kg of water glass, 26.53kg-51.34kg of NaOH solution and 408kg of natural macadam, wherein coal gangue replaces the natural macadam by an isovolumetric method, and the replacement rate is 60%.
Weighing solid NaOH and water glass, dissolving, uniformly stirring, and standing for 2 hours to prepare an alkali-activated solution.
The fly ash, the cement, the coal gangue and the natural sandstone are evenly stirred.
Gradually pouring the prepared alkali solution into the uniformly stirred material, and rapidly stirring when pouring the solution to uniformly stir the coal gangue geopolymer concrete.
And (4) testing the slump and the compressive strength of the geopolymer concrete.
In the test, all water is from water glass, and the alkali-activated solution is prepared by using the water glass solution.
The slump and the 28-day compressive strength of the novel coal gangue aggregate and fly ash geopolymer concrete prepared by the embodiment with the coal gangue coarse aggregate substitution rate of 60% are shown in Table 5.
Example 5:
accurately weighing the manufacturing materials, wherein the materials are as follows: 300.5kg-473.6kg of fly ash, 25.5kg-91.6kg of cement, 209.3 kg-607.4 kg of natural river sand, 109.21kg-350.07kg of water glass, 26.53kg-51.34kg of NaOH solution and 204kg of natural macadam, wherein the coal gangue replaces the natural macadam by an isovolumetric method, and the replacement rate is 80%.
Weighing solid NaOH and water glass, dissolving, uniformly stirring, and standing for 2 hours to prepare an alkali-activated solution.
The fly ash, the cement, the coal gangue and the natural sandstone are evenly stirred.
Gradually pouring the prepared alkali solution into the uniformly stirred material, and rapidly stirring when pouring the solution to uniformly stir the coal gangue geopolymer concrete.
And (4) testing the slump and the compressive strength of the geopolymer concrete.
In the test, all water is from water glass, and the alkali-activated solution is prepared by using the water glass solution.
The slump and the 28-day compressive strength of the novel coal gangue aggregate and fly ash geopolymer concrete prepared by the embodiment with the coal gangue coarse aggregate substitution rate of 80% are shown in table 6.
Has the beneficial effects that: according to the invention, a large amount of solid wastes such as coal gangue and coal ash are utilized, and the solid wastes are utilized and researched to prepare the novel coal gangue aggregate and coal ash geopolymer concrete, the prepared novel coal gangue aggregate and coal ash geopolymer concrete meets the requirement of strength, the slump meets the pumping requirement, the cost is lower, a novel building material is provided creatively, a reference basis is provided for the configuration of similar geopolymer concrete, the engineering application of the novel coal gangue aggregate and coal ash geopolymer concrete is promoted, the problem of resource shortage of natural broken stone is solved, and by using a large amount of solid wastes such as coal gangue and coal ash, the occupation of land resources and the pollution to atmosphere and underground water resources are reduced, and the waste problem of a large amount of manpower, material resources and financial resources is reduced.
In the preparation of the novel coal gangue aggregate and coal ash geopolymer concrete, water used in the experiment is completely from water glass, the water glass is dissolved in NaOH, the mixture is stirred to be clear and is kept stand for 2 hours, an alkali-activated solution is prepared, the coal ash is fully activated, and part of cement is doped to improve the early strength of a cementing material, so that the improvement of the strength of the coal gangue aggregate and geopolymer concrete is facilitated; the addition of the coal gangue can meet the strength of C30 concrete within 40 percent, and the coal gangue aggregate is used for preparing the coal ash geopolymer concrete, so that the strength and the slump can meet the requirements of common concrete, the common concrete can be replaced, the cost is low, and a large amount of solid waste is consumed.
Although embodiments of the present invention have been shown and described, it will be understood that the embodiments are illustrative and not restrictive, and that various changes, modifications, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A novel coal gangue aggregate and fly ash geopolymer concrete and a preparation method thereof are characterized in that the geopolymer concrete is prepared from the following raw materials:
300.5kg to 473.6kg of fly ash, 25.5kg to 91.6kg of cement, 209.3 kg to 607.4kg of natural river sand, 109.21kg to 350.07kg of water glass, 26.53kg to 51.34kg of NaOH solution and 201.3kg to 1219.6kg of natural macadam.
2. The novel coal gangue aggregate and coal ash geopolymer concrete material as claimed in claim 1, wherein the alkali-activator accounts for 4-8% of the weight of the cementing material, and the water glass modulus is 1.0-1.8.
3. The novel coal gangue aggregate and fly ash geopolymer concrete material as claimed in claim 1, wherein an amino water reducing agent is adopted, and the water reducing agent accounts for 0.5-2% of the weight of the cementing material.
4. The novel coal gangue aggregate and coal ash geopolymer concrete material as claimed in claim 1, wherein the concrete is prepared by using spontaneous coal gangue as an aggregate, preparing geopolymer by alkali-activated coal ash and adding less cement as a cementing material.
5. The novel coal gangue aggregate and coal ash geopolymer concrete material as claimed in claim 1, wherein natural broken stone is replaced by coal gangue by an isovolumetric method, and the replacement rate is 0-80%.
6. The novel coal gangue aggregate fly ash geopolymer concrete material as claimed in claim 1, wherein the water used for preparing the alkali-activated solution in the test is all derived from water glass.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210221778.XA CN114671641A (en) | 2022-03-07 | 2022-03-07 | Novel coal gangue aggregate fly ash geopolymer concrete material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210221778.XA CN114671641A (en) | 2022-03-07 | 2022-03-07 | Novel coal gangue aggregate fly ash geopolymer concrete material and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110183165A (en) * | 2019-06-03 | 2019-08-30 | 西安高科新达混凝土有限责任公司 | The concrete and its preparation process of fly ash base geopolymer concrete and normal concrete knot |
| CN110423057A (en) * | 2019-08-30 | 2019-11-08 | 深圳屹米达环保科技有限公司 | Gangue base geological polymer and preparation method thereof |
| WO2020056470A1 (en) * | 2018-09-21 | 2020-03-26 | Ahmed Redha Saleem Graytee | Sintered geopolymer compositions and articles |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020056470A1 (en) * | 2018-09-21 | 2020-03-26 | Ahmed Redha Saleem Graytee | Sintered geopolymer compositions and articles |
| CN110183165A (en) * | 2019-06-03 | 2019-08-30 | 西安高科新达混凝土有限责任公司 | The concrete and its preparation process of fly ash base geopolymer concrete and normal concrete knot |
| CN110423057A (en) * | 2019-08-30 | 2019-11-08 | 深圳屹米达环保科技有限公司 | Gangue base geological polymer and preparation method thereof |
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Application publication date: 20220628 |