CN112479615A - Geopolymer artificial aggregate based on crushing method and preparation method thereof - Google Patents
Geopolymer artificial aggregate based on crushing method 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
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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Abstract
The invention discloses a geopolymer artificial aggregate based on a crushing method and a preparation method thereof. The preparation method comprises the following steps: mixing the cementing material, the alkali activator and water, and stirring to obtain slurry; carrying out first curing on the slurry to obtain hardened geopolymer slurry; crushing the geopolymer slurry to obtain geopolymer aggregate particles; carrying out secondary curing on the geopolymer aggregate particles to obtain the geopolymer artificial aggregate; wherein the gel material consists of 50-100% of main material and 0-50% of secondary material by mass percentage. The crushing technology adopted by the invention is simple to operate, high energy consumption is not needed, and cement is not needed to be added, so that the problem that a large amount of greenhouse gas is discharged during cement calcination is avoided. In addition, the strength of the artificial aggregate of the invention increases with the increase of the standing time.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a geopolymer artificial aggregate based on a crushing method and a preparation method thereof.
Background
At present, with the continuous development of building engineering and real estate industries, natural aggregates are no longer natural resources in an "unlimited" supply. Although some engineers and researchers intend to solve this problem by using recycled aggregate, they have technical problems such as weak interface and the like, and the pretreatment of these problems requires a large amount of energy. On the other hand, the accumulation of industrial byproducts in large quantities also causes a series of environmental problems, and how to effectively recycle the industrial byproducts also becomes a problem to be solved by the current ecological sustainable development requirement.
Aiming at the problem of the shortage of the aggregate, the preparation of the artificial aggregate provides a very economic and effective technical means. At present, the adopted artificial aggregate forms mainly comprise two forms of calcined aggregate and cold-bonded aggregate. In the former, raw materials need to be put into an environment higher than 1000 ℃ for calcination and crystallization during preparation, and although the generated aggregate has the advantages of light weight, high strength and the like, the energy consumption is huge, and the method is not beneficial to industrial production. In the latter, a binding material (usually 20% cement) is used to bind industrial byproducts, and the industrial byproducts are hardened in water environment and then crushed to form artificial aggregates. This form is energy intensive but suffers from the strength limitations of the cementitious material, the concrete strength produced from the final product is generally low, and the use of cement results in the emission of large amounts of carbon dioxide, thereby creating a greenhouse effect.
Disclosure of Invention
In view of the above mentioned environmental problems, a current alkali-activated polymer cement is a reasonably effective solution. The geopolymer is prepared by exciting a silicon-aluminum-calcium phase material by alkali in a water environment, so that the material can be quickly hardened to form a gelled material with certain strength. The material has the advantages of low energy consumption, low carbon dioxide emission, corrosion resistance, high strength, capability of solidifying heavy metal ions and the like, and is a typical green building material. The invention utilizes the crushing method to crush the alkali-activated geopolymer slurry, thereby preparing the geopolymer artificial aggregate with high strength, high durability and sustainable increase of strength.
The technical scheme of the invention is as follows:
in a first aspect, the present invention provides a method for preparing geopolymer artificial aggregate based on a crushing method, wherein the method comprises the steps of:
mixing the cementing material, the alkali activator and water, and stirring to obtain slurry;
carrying out first curing on the slurry to obtain hardened geopolymer slurry;
crushing the geopolymer slurry to obtain geopolymer aggregate particles;
carrying out secondary curing on the geopolymer aggregate particles to obtain the geopolymer artificial aggregate;
wherein the cement material consists of 50-100% of a main material and 0-50% of a secondary material by mass percentage, wherein the main material comprises an industrial byproduct with a pozzolan activity, and the secondary material comprises at least one of industrial solid waste with a weak excitability and municipal solid waste incineration ash.
Optionally, the primary material is an industrial by-product having pozzolanic activity; alternatively, the main material is a mixture of an industrial byproduct having a pozzolanic activity and a calcium-phase industrial byproduct having a high excitability.
Optionally, the industrial byproduct with pozzolanic activity is fly ash, and the calcium-phase industrial byproduct with high excitability is granulated blast furnace slag powder.
Optionally, the industrial solid waste is at least one of red mud, lithium slag, steel slag and waste glass;
the municipal solid waste incineration ash is at least one of incineration ash bottom ash and fly ash.
Optionally, the alkali-activator is industrial sodium metasilicate;
the mass fraction of sodium oxide in the industrial sodium metasilicate in the cementing material is 5-8%, and the molar ratio of silicon dioxide to sodium oxide in the industrial sodium metasilicate is 0.5-2.0.
Optionally, the mass ratio of water to cementitious material is between 0.3 and 0.4.
Optionally, the geopolymer aggregate particles have a particle size of 0-20 mm.
Optionally, the step of maintaining the slurry for the first time specifically includes: and curing the slurry at normal temperature for 24-48 hours.
Optionally, the step of performing a second curing on the geopolymer aggregate particles specifically includes: curing the geopolymer aggregate particles at the temperature of 60-105 ℃ for 24-48 hours, and curing at normal temperature for more than 28 days.
In a second aspect, the invention provides geopolymer artificial aggregate, wherein the geopolymer artificial aggregate is prepared by the preparation method based on the crushing method.
Has the advantages that: the invention adopts industrial byproducts as main raw materials or is supplemented with part of industrial solid waste or municipal domestic waste incineration ash with weak excitation performance, alkali excitation is carried out by adopting an alkali excitant, geopolymer slurry with certain gel capacity and hardening strength is obtained, then the geopolymer slurry is crushed into an aggregate form by using a crushing mode, and the geopolymer artificial aggregate with good mechanical properties (including high strength and sustainable strength increase) and excellent durability can be obtained after maintenance. The artificial aggregate provides new possibility for replacing natural aggregate, and solves the environmental problems of aggregate shortage and industrial byproduct accumulation to a certain extent. Meanwhile, if a secondary material is added, the primary material having the heavy metal consolidation capability can consolidate the toxic metals in the secondary material. Compared with the traditional waste treatment technology, the invention has good environmental effect and greatly reduces the cost. In addition, the crushing method has low energy consumption, and does not need to add cement, thereby avoiding the problem of discharging a large amount of greenhouse gas during cement calcination. In addition, the method has the advantages of convenient operation, no need of complex special production devices, simple process and low production cost.
Detailed Description
The invention provides a geopolymer artificial aggregate based on a crushing method and a preparation method thereof, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a preparation method of a geopolymer artificial aggregate based on a crushing method, which comprises the following steps:
s10, mixing the gelled material, the alkali activator and water, and stirring to obtain slurry;
s20, carrying out first curing on the slurry to obtain hardened geopolymer slurry;
s30, crushing the geopolymer slurry to obtain geopolymer aggregate particles;
s40, carrying out secondary curing on the geopolymer aggregate particles to obtain the geopolymer artificial aggregate;
wherein the cement material consists of 50-100% of a main material and 0-50% of a secondary material by mass percentage, wherein the main material comprises an industrial byproduct with a pozzolan activity, and the secondary material comprises at least one of industrial solid waste with a weak excitability and municipal solid waste incineration ash.
In the embodiment, industrial byproducts are used as main materials, secondary materials (such as industrial solid wastes or municipal waste incineration ash) can be added or not added, alkali excitant (such as industrial sodium metasilicate) is used for alkali excitation, geopolymer slurry with certain gelling capacity and hardening strength is obtained, then the geopolymer slurry is crushed into an aggregate form by a crushing mode, and the geopolymer artificial aggregate with good mechanical properties (including high strength and sustainable strength increase) and excellent durability can be obtained after maintenance.
In this embodiment, the gelling material may be a whole primary material, or at least one of the industrial solid waste and the incineration ash of the municipal solid waste with weak excitability may be used as a secondary material to replace a part of the primary material, and the heavy metals in the secondary material (usually toxic heavy metals remain in the incineration ash of the industrial solid waste and the municipal solid waste because of unsorted treatment) may be efficiently solidified by the alkali-excited primary material with heavy metal solidifying capability.
The present embodiment also has the following advantages:
1. the embodiment takes industrial byproducts as main materials or is supplemented with part of industrial solid wastes or municipal domestic waste incineration ash with weak excitation performance as secondary materials, adopts a cheap alkali exciting agent, has low production cost and good economic benefit, can solidify heavy metal elements, has the advantage of environmental protection, turns waste into treasure, and greatly solves the environmental problem in the aspect of industrial byproduct, waste and garbage accumulation.
2. Different from most of preparation processes adopting cement bonding, the artificial aggregate is prepared in an alkali excitation mode without adding cement, so that the emission of carbon dioxide is reduced.
3. The artificial aggregate of the embodiment provides new possibility for replacing natural aggregate, and solves the problem of shortage of aggregate to a certain extent.
4. The crushing technology adopted by the embodiment is simple to operate and does not need high energy consumption. In addition, the method is convenient to operate and simple in process.
5. The strength of the artificial aggregate of this example increased with increasing standing time, mainly due to the fact that the pozzolanic properties of the industrial by-product are constantly excited over a long period of time. The strength requirement of the aggregate can be adjusted according to the performance requirement of the product, and the adjusting method can comprise the following steps: change the content of the main material and carry out surface treatment, change the content of the secondary material, change the water consumption, change the content of the alkali-activator, change the type of the alkali-activator, change the maintenance mode and the like. In addition, the properties such as alkalinity, water absorption and the like of the aggregate can be adjusted according to the product performance requirements, and can be adjusted by adopting the method.
6. The geopolymer artificial aggregate obtained by crushing in the embodiment is irregular, and the finally prepared geopolymer artificial aggregate can be applied as a coarse aggregate (4.75-20mm) or a river sand substitute (0-4.75mm) according to the particle size range of the crushed geopolymer aggregate.
In step S10, in one embodiment, the main material is an industrial byproduct having pozzolanic activity; alternatively, the main material is a mixture of an industrial byproduct having a pozzolanic activity and a calcium-phase industrial byproduct having a high excitability.
In one embodiment, the industrial byproduct having pozzolanic activity is fly ash.
In one embodiment, the calcium phase industrial byproduct with high excitability is granulated blast furnace slag powder.
In one embodiment, the industrial solid waste is at least one of red mud, lithium slag, steel slag, waste glass, and the like.
In one embodiment, the municipal solid waste incineration ash is at least one of incineration ash bottom ash and fly ash.
In one embodiment, the alkali-activator is industrial sodium metasilicate or the like. The embodiment adopts cheap industrial sodium metasilicate as the alkali activator for alkali excitation, has low production cost and good economic benefit.
In one embodiment, the sodium oxide in the industrial sodium metasilicate accounts for 5-8% of the mass of the cementing material, and the selection range can ensure the sufficient excitation of industrial byproducts and avoid the phenomena of efflorescence when the alkali content is too high as much as possible; the molar ratio of silicon dioxide to sodium oxide in the industrial sodium metasilicate is 0.5-2.0.
In one embodiment, the water to cement mass ratio is 0.3 to 0.4, the amount of water used ensures adequate mixing of the geopolymer slurry, while a lower water-cement ratio produces a higher strength geopolymer.
In step S20, in an embodiment, the step of curing the slurry for the first time specifically includes: and curing the slurry at normal temperature (20-30 ℃) for 24-48 hours. Through the curing, geopolymer slurry with proper strength can be obtained, and the strength of the geopolymer slurry is specifically in the range of 0.3-35 MPa. Because too high a strength will consume energy for subsequent crushing, while too low a strength will be difficult to crush into a good aggregate shape.
In step S30, in one embodiment, the geopolymer aggregate particles have a particle size of 0 to 20 mm. When the particle size of the geopolymer aggregate particles is 0-4.75mm, the geopolymer artificial aggregate finally prepared can be used as river sand; when the particle size of the geopolymer aggregate particles is 4.75-20mm, the geopolymer artificial aggregate finally prepared can be used as a coarse aggregate, so that the material can be fully utilized.
In an embodiment, in step S40, the step of performing a second curing on the geopolymer aggregate particles specifically includes: curing the geopolymer aggregate particles at the temperature of 60-105 ℃ for 24-48 hours, and then curing at normal temperature (20-30 ℃) for more than 28 days. Curing at 60-105 deg.C to promote the activity of volcanic ash.
In one embodiment, the step of curing the geopolymer aggregate particles for the second time specifically comprises: and curing the geopolymer aggregate particles at the temperature of 60-105 ℃ for 24 hours, and then curing at normal temperature for 28 days, wherein the geopolymer aggregate particles can be put into use after curing.
The embodiment takes industrial byproducts as preparation raw materials, or is supplemented with part of industrial solid wastes or municipal domestic waste incineration ash with weak excitation performance as secondary materials, adopts a cheap alkali exciting agent, has low production cost, has good economic benefit, does not generate toxic gas in the reaction process, can also solidify heavy metal elements in the wastes or garbage, and has the advantage of environmental protection. Meanwhile, the artificial aggregate of the embodiment provides a new possibility for replacing natural aggregate, and the requirements of strength and the like of the artificial aggregate can be adjusted according to the product performance requirements, and the adjusting method can comprise the following steps: change the content of the main material and carry out surface treatment, change the content of the secondary material, change the water consumption, change the content of the alkali-activator, change the type of the alkali-activator, change the maintenance mode and the like.
The embodiment of the invention provides a geopolymer artificial aggregate, which is prepared by adopting the preparation method of the geopolymer artificial aggregate based on the crushing method.
The strength of the artificial aggregate in the embodiment is increased along with the increase of the standing time. The strength requirement of the aggregate can be adjusted according to the performance requirement of the product, and the adjusting method can comprise the following steps: change the content of the main material and carry out surface treatment, change the content of the secondary material, change the water consumption, change the content of the alkali-activator, change the type of the alkali-activator, change the maintenance mode and the like.
The invention is further illustrated by the following specific examples.
Example 1
The geopolymer artificial aggregate based on the crushing method comprises the following components:
(1) the cementing material adopts fly ash, accounts for 100 percent of the total amount of the cementing material, and has no secondary material;
(2) the alkali activator is industrial sodium metasilicate, the modulus (the molar ratio of silicon dioxide to sodium oxide in the alkali activator) is 0.94, and the sodium oxide content in the alkali activator accounts for 5.2 percent of the mass of the cementing material;
(3) the mass ratio of water to cementitious material was 0.3.
The process for preparing geopolymer artificial aggregate based on the crushing method in the embodiment is as follows:
firstly, uniformly stirring fly ash and industrial sodium metasilicate, and then adding water to obtain slurry; pouring the slurry into a mould after the slurry is formed, and curing for 24 hours at normal temperature to obtain hardened geopolymer slurry; then, taking out the geopolymer slurry, crushing by using a crusher to obtain geopolymer aggregate particles with the size of 0-20 mm; finally, the geopolymer aggregate particles are put in an oven at 105 ℃ for curing for 24 hours, and taken out for curing at normal temperature for 28 days.
And (3) carrying out basic performance test on the prepared geopolymer artificial aggregate, wherein the test method is according to the second part of the national standard GB/T17431.2-2010 of the people's republic of China: test method for lightweight aggregate ", the test results are as follows:
24h water absorption: 22.4 percent;
apparent density: 1536.4kg/m3；
Bulk density: 770.9kg/m3；
Barrel pressure strength: 2.615 MPa.
Example 2
The geopolymer artificial aggregate based on the crushing method comprises the following components:
(1) the cementing material mainly adopts fly ash and granulated blast furnace slag powder which respectively account for 90 percent and 10 percent of the total amount of the cementing material, and no secondary material is used;
(2) the alkali activator is industrial sodium metasilicate, the modulus (the molar ratio of silicon dioxide to sodium oxide in the activator) is 0.94, and the sodium oxide content in the alkali activator accounts for 5.2 percent of the mass of the cementing material;
(3) the mass ratio of water to cementitious material was 0.3.
The process for preparing geopolymer artificial aggregate based on the crushing method in the embodiment is as follows:
firstly, uniformly stirring granulated blast furnace slag powder, fly ash and industrial sodium metasilicate, further adding water to obtain slurry, pouring the slurry into a mould after the slurry is formed, and curing for 24 hours at normal temperature to obtain hardened geopolymer slurry; then, taking out the geopolymer slurry, crushing by using a crusher to obtain geopolymer aggregate particles with the size of 0-20 mm; finally, the geopolymer aggregate particles are put in an oven at 105 ℃ for curing for 24 hours, and taken out for curing at normal temperature for 28 days.
And (3) carrying out basic performance test on the prepared geopolymer artificial aggregate, wherein the test method is according to the second part of the national standard GB/T17431.2-2010 of the people's republic of China: test method for lightweight aggregate ", the test results are as follows:
24h water absorption: 18.6 percent;
apparent density: 1663.0kg/m3；
Bulk density: 760.8kg/m3；
Barrel pressure strength: 3.154 MPa.
Example 3
The geopolymer artificial aggregate based on the crushing method comprises the following components:
(1) the cementing material adopts fly ash, accounts for 100 percent of the total amount of the cementing material, and has no secondary material;
(2) the alkali activator is industrial sodium metasilicate, the modulus (the molar ratio of silicon dioxide to sodium oxide in the activator) is 0.94, and the mass fraction of the sodium oxide in the activator in the cementing material is 7.3%;
(3) the mass ratio of water to cementitious material was 0.3.
The process for preparing geopolymer artificial aggregate based on the crushing method in the embodiment is as follows:
firstly, uniformly stirring the fly ash and industrial sodium metasilicate, adding water to obtain slurry, pouring the slurry into a mould after the slurry is formed, and curing for 24 hours at normal temperature to obtain hardened geopolymer slurry; then, taking out the geopolymer slurry, crushing by using a crusher to obtain geopolymer aggregate particles with the size of 0-20 mm; finally, the geopolymer aggregate particles are put in an oven at 105 ℃ for curing for 24 hours, and taken out for curing at normal temperature for 28 days.
And (3) carrying out basic performance test on the prepared geopolymer artificial aggregate, wherein the test method is according to the second part of the national standard GB/T17431.2-2010 of the people's republic of China: test method for lightweight aggregate ", the test results are as follows:
24h water absorption: 17.1 percent;
apparent density: 1689.3kg/m3；
Bulk density: 761.8kg/m3；
Barrel pressure strength: 4.683 MPa.
Example 4
The geopolymer artificial aggregate based on the crushing method comprises the following components:
(1) the main material adopts fly ash which accounts for 80 percent of the total amount of the cementing material, and the secondary material is municipal refuse incineration bottom ash which accounts for 20 percent of the total amount of the cementing material;
(2) the alkali activator is industrial sodium metasilicate, the modulus (the molar ratio of silicon dioxide to sodium oxide in the activator) is 0.94, and the mass fraction of the sodium oxide in the activator in the cementing material is 6.3%;
(3) the mass ratio of water to cementitious material was 0.3.
The process for preparing geopolymer artificial aggregate based on the crushing method in the embodiment is as follows:
firstly, uniformly stirring fly ash, municipal waste incineration bottom ash and industrial sodium metasilicate, further adding water to obtain slurry, pouring the slurry into a mold after the slurry is formed, and curing for 48 hours at normal temperature to obtain hardened geopolymer slurry; then, taking out the geopolymer slurry, crushing by using a crusher to obtain geopolymer aggregate particles with the size of 0-20 mm; finally, the geopolymer aggregate particles are put in an oven at 105 ℃ for curing for 24 hours, and taken out for curing at normal temperature for 28 days.
And (3) carrying out basic performance test on the prepared geopolymer artificial aggregate, wherein the test method is according to the second part of the national standard GB/T17431.2-2010 of the people's republic of China: test method for lightweight aggregate ", the test results are as follows:
24h water absorption: 18.5 percent;
apparent density: 1394.3kg/m3；
Bulk density: 611.4kg/m3；
Barrel pressure strength: 2.216 MPa.
The geopolymer artificial aggregates prepared in the above examples 1-4 have an aggregate particle size ranging from 0 to 20 mm. Selecting aggregate with the particle size range of 5-20mm, the water absorption of the aggregate is larger than that of the natural sand stone, and the apparent density is about 1300-3Within the range, compared with natural rock aggregate, the aggregate has the advantage of light weight, the cylinder pressure strength can reach the level of cold-concreted artificial aggregate at 28 days, and the strength of the aggregate can still be improved as the volcanic ash reaction is continuously carried out along with the increase of time. When the municipal solid waste incineration bottom ash is mixed, although partial strength can be sacrificed, the material is lighter, on one hand, the use amount of main materials can be reduced, and on the other hand, the transportation cost can be reduced in practical application.
In summary, the invention provides a geopolymer artificial aggregate based on a crushing method and a preparation method thereof, the geopolymer artificial aggregate adopts industrial byproducts (such as fly ash and granulated blast furnace slag powder) as main gelled materials, can be added with or without adding secondary gelled materials (such as industrial solid waste or municipal refuse incineration ash), and is subjected to alkali excitation by an alkali activator (such as industrial sodium metasilicate), so that geopolymer slurry with certain gelling capacity and hardening strength is obtained, then the geopolymer slurry is crushed into an aggregate form by a crushing mode, and the geopolymer artificial aggregate with good mechanical properties (including high strength and sustainable strength increase) and excellent durability can be obtained after maintenance. The invention takes industrial byproducts as main gelled materials, or takes partial industrial solid wastes or municipal domestic waste incineration ash with weak excitation performance as auxiliary gelled materials, adopts cheap industrial solid or liquid alkali and the like as alkali excitant, has low production cost, has good economic benefit, can solidify heavy metal elements, and has the advantages of environmental protection. Meanwhile, the artificial aggregate provides new possibility for replacing natural aggregate, solves the problem of shortage of the aggregate to a certain extent, and greatly solves the environmental problems in the aspects of industrial byproducts, waste materials and garbage accumulation by turning waste into valuable in the embodiment. In addition, the crushing technology adopted by the invention is simple to operate, high energy consumption is not needed, and cement is not needed to be added, so that the problem of emission of a large amount of greenhouse gases during cement calcination is avoided. In addition, the strength of the artificial aggregate of the present invention increases with the increase of the standing time. The strength requirement of the aggregate can be adjusted according to the performance requirement of the product, and the adjusting method can comprise the following steps: changing the content of granulated blast furnace slag powder and carrying out surface treatment, changing the water consumption, changing the content of the alkali-activator, changing the type of the alkali-activator, changing the maintenance mode and the like.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A preparation method of geopolymer artificial aggregate based on a crushing method is characterized by comprising the following steps:
mixing the cementing material, the alkali activator and water, and stirring to obtain slurry;
carrying out first curing on the slurry to obtain hardened geopolymer slurry;
crushing the geopolymer slurry to obtain geopolymer aggregate particles;
carrying out secondary curing on the geopolymer aggregate particles to obtain the geopolymer artificial aggregate;
wherein the cement material consists of 50-100% of a main material and 0-50% of a secondary material by mass percentage, wherein the main material comprises an industrial byproduct with a pozzolan activity, and the secondary material comprises at least one of industrial solid waste with a weak excitability and municipal solid waste incineration ash.
2. The method for preparing a geopolymer artificial aggregate based on a crushing method according to claim 1, wherein the main material is an industrial byproduct having a pozzolanic activity; alternatively, the main material is a mixture of an industrial byproduct having a pozzolanic activity and a calcium-phase industrial byproduct having a high excitability.
3. The method for preparing a geopolymer artificial aggregate based on a crushing method according to claim 2, wherein the industrial byproduct having a pozzolanic activity is fly ash, and the calcium-phase industrial byproduct having a high excitability is granulated blast furnace slag powder.
4. The method for preparing the geopolymer artificial aggregate based on the crushing method according to claim 1, wherein the industrial solid waste is at least one of red mud, lithium slag, steel slag and waste glass; the municipal solid waste incineration ash is at least one of incineration ash bottom ash and fly ash.
5. The method for preparing geopolymer artificial aggregate based on the crushing method according to claim 1, wherein the alkali activator is industrial sodium metasilicate;
the mass fraction of sodium oxide in the industrial sodium metasilicate in the cementing material is 5-8%, and the molar ratio of silicon dioxide to sodium oxide in the industrial sodium metasilicate is 0.5-2.0.
6. The method for preparing geopolymer artificial aggregate according to claim 1, wherein the mass ratio of the water to the cementing material is 0.3-0.4.
7. The method for preparing geopolymer artificial aggregate based on the crushing method as claimed in claim 1, wherein the particle size of the geopolymer aggregate particles is 0-20 mm.
8. The method for preparing a geopolymer artificial aggregate based on a crushing method according to claim 1, wherein the step of performing first curing on the slurry specifically comprises: and curing the slurry at normal temperature for 24-48 hours.
9. The method for preparing geopolymer artificial aggregate based on the crushing method as claimed in claim 1, wherein the step of carrying out secondary curing on the geopolymer aggregate particles specifically comprises the following steps: curing the geopolymer aggregate particles at the temperature of 60-105 ℃ for 24-48 hours, and curing at normal temperature for more than 28 days.
10. A geopolymer artificial aggregate prepared by the method for preparing a geopolymer artificial aggregate based on the crushing method according to any one of claims 1 to 9.
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Cited By (2)
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|---|---|---|---|---|
| CN114538832A (en) * | 2022-01-26 | 2022-05-27 | 香港理工大学 | FRP concrete member and application thereof |
| CN116161906A (en) * | 2021-11-25 | 2023-05-26 | 香港理工大学深圳研究院 | High-strength high-toughness fiber concrete based on geopolymer artificial aggregate and preparation method thereof |
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| CN107074651A (en) * | 2014-08-13 | 2017-08-18 | 保利阿格有限公司 | The aggregate of geo-polymer and geo-polymer |
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| CN107074651A (en) * | 2014-08-13 | 2017-08-18 | 保利阿格有限公司 | The aggregate of geo-polymer and geo-polymer |
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| 胡曙光等: "《特种水泥》", 31 January 2010, 武汉理工大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116161906A (en) * | 2021-11-25 | 2023-05-26 | 香港理工大学深圳研究院 | High-strength high-toughness fiber concrete based on geopolymer artificial aggregate and preparation method thereof |
| CN114538832A (en) * | 2022-01-26 | 2022-05-27 | 香港理工大学 | FRP concrete member and application thereof |
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| CN112479615B (en) | 2021-09-28 |
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