CN116375377A - Artificial aggregate and preparation method thereof - Google Patents
Artificial aggregate and preparation method thereof Download PDFInfo
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- CN116375377A CN116375377A CN202310249570.3A CN202310249570A CN116375377A CN 116375377 A CN116375377 A CN 116375377A CN 202310249570 A CN202310249570 A CN 202310249570A CN 116375377 A CN116375377 A CN 116375377A
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- granulator
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- 238000002360 preparation method Methods 0.000 title claims abstract description 35
- 239000002994 raw material Substances 0.000 claims abstract description 75
- 238000003763 carbonization Methods 0.000 claims abstract description 71
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000000463 material Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 29
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 29
- 238000005469 granulation Methods 0.000 claims abstract description 25
- 230000003179 granulation Effects 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 24
- 238000005507 spraying Methods 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims description 52
- 239000000203 mixture Substances 0.000 claims description 23
- 238000005303 weighing Methods 0.000 claims description 22
- 239000012190 activator Substances 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 5
- 239000010881 fly ash Substances 0.000 claims description 4
- 238000010298 pulverizing process Methods 0.000 claims description 4
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims 3
- 239000007858 starting material Substances 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 abstract description 25
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000005265 energy consumption Methods 0.000 abstract description 10
- 238000012423 maintenance Methods 0.000 abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 239000004566 building material Substances 0.000 abstract description 5
- 239000004568 cement Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 239000012856 weighed raw material Substances 0.000 description 19
- 239000000853 adhesive Substances 0.000 description 16
- 230000001070 adhesive effect Effects 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 10
- 239000012298 atmosphere Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000035425 carbon utilization Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of building materials, in particular to an artificial aggregate and a preparation method thereof, wherein the artificial aggregate comprises the following raw materials: 20-100 parts of air hardening cementing material, 0-80 parts of admixture and exciting agent; the air hardening cementing material is one of gamma-C2S cementing material or C3S2 cementing material; the preparation method of the artificial aggregate comprises the steps of raw material mixing, water spraying granulation and carbon dioxide maintenance. The cementing material taking gamma-C2S as the main mineral phase has lower carbon emission and low energy consumption in the production process, has high carbonization activity, and can reach 28d ordinary cement strength under the condition of 24h accelerated carbonization.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an artificial aggregate and a preparation method thereof.
Background
The artificial aggregate plays a role in framework and support in the building, and the silicate cement is used as a main cementing material and is prepared through the stages of mixing, granulating, curing, firing and the like.
Chinese patent publication No. CN112010602A discloses a high-strength recycled aggregate concrete and a preparation method thereof, wherein raw materials such as cement, fly ash, silica fume and the like are adopted for granulation, and natural maintenance is carried out for 25-30 days; chinese patent publication No. CN109081623B discloses a lightweight aggregate and a preparation method thereof, and the lightweight aggregate is obtained by curing for 24 hours in a constant temperature oven at 120 ℃ after granulation and sintering at 1050 ℃.
At present, the artificial aggregate curing process mainly adopts a steam curing and steam pressure hardening or calcining hardening mode; the curing period of the steam curing and the steam curing hardening mode is longer, the energy consumption during curing is increased, the production cost is indirectly increased, the aggregate particles are required to be placed at a high temperature (about 1200 ℃) for sintering in the calcining hardening mode, the energy consumption of the sintering hardening mode is huge, a large amount of carbon dioxide and other byproduct gases can be generated in the sintering process, certain harm is caused to the environment, and the high production energy consumption and carbon emission are unfavorable for the green sustainable development of the building material industry in the silicate mud production process.
Disclosure of Invention
The invention aims to provide an artificial aggregate and a preparation method thereof, and the cementing material taking gamma-C2S as a main mineral phase has lower carbon emission and low energy consumption in the production process, has high carbonization activity, and can reach 28d ordinary cement strength under the condition of accelerating carbonization for 24 hours.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an artificial aggregate, which comprises the following raw materials: 20-100 parts of air hardening cementing material and 0-80 parts of admixture.
Preferably, the air hardening cementing material is one of gamma-C2S cementing material or C3S2 cementing material; the air hardening cementing material is self-pulverization white cementing material prepared by firing at the temperature of 1200-1450 ℃.
Preferably, the admixture is one or two of fly ash and slag soil.
Preferably, the composition also comprises an exciting agent, wherein the exciting agent is NaHCO 3 、NaCO 3 And one or more of gypsum.
Preferably, the exciting agent material is exciting agent with the weight of 4-8% of the raw material weight.
The preparation method of the artificial aggregate comprises the following preparation steps:
s1, weighing raw materials according to a proportion, and uniformly mixing the raw materials and putting the mixture into a disc granulator;
s2, opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotating speed of the disk granulator is controlled to be 30-35rpm, and the mass ratio of water to the weight of raw materials is controlled to be 0.15-0.25.
S3, placing the aggregate particles prepared in the step S2 into a carbonization kettle for curing, wherein the curing temperature is room temperature; the relative humidity is 20-95%; carbonization pressure: 0.1-0.3MPa; the concentration of the carbon dioxide is 25% -99%; the carbonization time is 2-10h.
Preferably, the aggregate particles produced in step S2 have a particle size of 3 to 10mm.
Based on the technical scheme, the invention at least has the following technical effects: the white air hardening cementing material is prepared by firing industrial raw materials, has self-pulverization property, does not need grinding, and can effectively reduce grinding energy consumption of clinker; compared with C3S and beta-C2S in common Portland cement, the cementing material taking gamma-C2S as a main mineral phase has lower carbon emission and low energy consumption in the production process, has high carbonization activity, can reach 28d common cement strength under the condition of accelerating carbonization, greatly shortens the maintenance period, and indirectly reduces the production cost of the artificial aggregate. According to the preparation method of the artificial aggregate, the white air hardening cementing material is used as the cementing material of the artificial aggregate, the cementing material is formed by a disc granulator and then placed in a carbon dioxide atmosphere for maintenance, a large amount of products are generated by rapid reaction with carbon dioxide, surrounding particles are wrapped and connected together, calcium carbonate in the products is used as a main strength contributor, and carbon dioxide with the concentration of 25-99% is used as a maintenance atmosphere, so that the strength of the artificial aggregate product can be greatly improved. The invention can effectively solve the interface problem caused by the internal damage of the recycled concrete aggregate and the old mortar on the surface, reduce the production energy consumption of the artificial aggregate, shorten the maintenance period and indirectly reduce the operation cost of enterprises.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments.
The invention provides an artificial aggregate, which comprises the following raw materials: 20-100 parts of air hardening cementing material, 0-80 parts of admixture and an exciting agent. Preferably, the air hardening cementing material is one of gamma-C2S cementing material or C3S2 cementing material; the air hardening cementing material is self-pulverization white cementing material prepared by firing at the temperature of 1200-1450 ℃. Preferably, the admixture is one or two of fly ash and slag soil. Preferably, the activator is NaHCO 3 、NaCO 3 And one or more of gypsum. Preferably, the exciting agent material is exciting agent with the weight of 4-8% of the raw material weight.
The preparation method of the artificial aggregate comprises the following preparation steps:
s1, weighing raw materials according to a proportion, and uniformly mixing the raw materials and putting the mixture into a disc granulator;
s2, opening a disk type granulator to carry out water spraying granulation to obtain aggregate particles with the particle size of 3-10 mm; the rotating speed of the disk granulator is controlled to be 30-35rpm, and the mass ratio of water to the weight of raw materials is controlled to be 0.15-0.25.
S3, placing the aggregate particles prepared in the step S2 into a carbonization kettle for curing, wherein the curing temperature is room temperature; the relative humidity is 20-95%; carbonization pressure: 0.1-0.3MPa; the concentration of the carbon dioxide is 25% -99%; the carbonization time is 2-10h.
1. Preparation example
Example 1
1.1 raw materials
Weighing the following raw materials in parts by weight: 20. the adhesive comprises, by weight, an air hardening cementing material, 80 parts of an admixture and 6% of an exciting agent.
1.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 2
2.1 raw materials
Weighing the following raw materials in parts by weight: 30. the adhesive comprises, by weight, an air hardening cementing material, 70 parts of an admixture and 6% of an exciting agent.
2.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 3
3.1 raw materials
Weighing the following raw materials in parts by weight: 40. the adhesive comprises, by weight, air-setting gelling material, 60 parts of an admixture and 6% of an exciting agent.
3.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 4
4.1 raw materials
Weighing the following raw materials in parts by weight: 50. the adhesive comprises, by weight, air-setting gelling materials, 50 parts of additives and 6% of an exciting agent.
4.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 5
5.1 raw materials
Weighing the following raw materials in parts by weight: 600. the adhesive comprises, by weight, an air hardening cementing material, 40 parts of an admixture and 6% of an exciting agent.
5.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 6
6.1 raw materials
Weighing the following raw materials in parts by weight: 70. the adhesive comprises, by weight, an air hardening cementing material, 30 parts of an admixture and 6% of an exciting agent.
6.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 7
7.1 raw materials
Weighing the following raw materials in parts by weight: 80. the adhesive comprises, by weight, an air hardening cementing material, 20 parts of an admixture and 6% of an exciting agent.
7.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 8
8.1 raw materials
Weighing the following raw materials in parts by weight: 90. the adhesive comprises, by weight, an air hardening cementing material, 10 parts of an admixture and 6% of an exciting agent.
8.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 9
9.1 raw materials
Weighing the following raw materials in parts by weight: 100 parts of air hardening cementing material and 6% of exciting agent.
9.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 10
10.1 raw materials
Weighing the following raw materials in parts by weight: 70. the adhesive comprises, by weight, an air hardening cementing material, 30 parts of an admixture and 4% of an exciting agent.
10.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 11
11.1 raw materials
Weighing the following raw materials in parts by weight: 70. the adhesive comprises, by weight, an air hardening cementing material, 30 parts of an admixture and 8% of an exciting agent.
11.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 12
12.1 raw materials
Weighing the following raw materials in parts by weight: 70. the adhesive comprises, by weight, an air hardening cementing material, 30 parts of an admixture and 6% of an exciting agent.
12.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 30rpm and the mass ratio of water to the weight of the raw material was 0.15.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 13
13.1 raw materials
Weighing the following raw materials in parts by weight: 70. the adhesive comprises, by weight, an air hardening cementing material, 30 parts of an admixture and 6% of an exciting agent.
13.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.18.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 14
14.1 raw materials
Weighing the following raw materials in parts by weight: 70. the adhesive comprises, by weight, an air hardening cementing material, 30 parts of an admixture and 6% of an exciting agent.
14.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 34rpm and the mass ratio of water to the weight of the raw material was 0.23.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Example 15
15.1 raw materials
Weighing the following raw materials in parts by weight: 70. the adhesive comprises, by weight, an air hardening cementing material, 30 parts of an admixture and 6% of an exciting agent.
15.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 35rpm and the mass ratio of water to the weight of the raw material was 0.25.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
2. Comparative examples
Comparative example 1
1.1 raw materials
Weighing the following raw materials in parts by weight: 100 parts of admixture and 6% of excitant.
1.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Comparative example 2
2.1 raw materials
Weighing the following raw materials in parts by weight: 70. parts of air hardening cementing material and 30 parts of admixture.
2.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.3MPa; the concentration of carbon dioxide is 99%; the carbonization time was 8h.
Comparative example 3
3.1 raw materials
Weighing the following raw materials in parts by weight: 70. the adhesive comprises, by weight, an air hardening cementing material, 30 parts of an admixture and 6% of an exciting agent.
3.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
Placing the prepared aggregate particles in a carbonization kettle for curing, wherein the curing temperature is 25 ℃ at room temperature; the relative humidity was 95%; carbonization pressure: 0.2MPa; the nitrogen concentration is 99%; the carbonization time was 8h.
Comparative example 4
4.1 raw materials
Weighing the following raw materials in parts by weight: 70. the adhesive comprises, by weight, an air hardening cementing material, 30 parts of an admixture and 6% of an exciting agent.
4.2 Preparation
Uniformly mixing the weighed raw materials and putting the mixture into a disc granulator; opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; the rotational speed of the disk granulator was controlled at 32rpm and the mass ratio of water to the weight of the raw material was 0.2.
And standing the prepared aggregate particles for 24 hours, and transferring the aggregate particles into a curing box at 55 ℃ for curing for 48 hours.
3. Performance detection
The test was performed according to the cylinder pressure standard in the lightweight aggregate and its experimental method GB/T17431.1-2010 standard, and the results are shown in table 1:
TABLE 1 Performance test of examples 1-15, comparative examples 1-4
By comparing the comparative example 4 with the example 6, the prepared gamma-C2S air hardening gel material has equivalent pressure intensity performance in carbon dioxide curing and an artificial aggregate cylinder prepared by ordinary Portland cement through a steam curing mode, and the advantages of short curing time, low energy consumption and the like of the artificial aggregate prepared by the gamma-C2S air hardening gel material are reflected. By comparing the comparative case 1, the comparative case 3 and the embodiment case 6, the requirement of preparing the artificial aggregate in the gamma-C2S air hardening gel material and the carbon dioxide atmosphere curing is obtained. It is known from comparison of comparative case 2 with embodiment 6 that the addition of a certain amount of carbon activator is advantageous for promoting carbonization during carbonization maintenance. By comparison of other cases, the addition amounts of the gamma-C2S air hardening gel material, the admixture, the water and the excitant are the influencing factors of the barrel pressure strength of the artificial aggregate, wherein under the condition that the concentration of 99 percent of carbon dioxide is 0.2, the barrel pressure strength of the artificial aggregate is high and reaches 8.8MPa by 70 parts of gamma-C2S air hardening gel material, 30 parts of admixture, 6 percent of excitant and water. The invention uses white gamma-C2S as an air hardening cementing material and performs maintenance in carbon dioxide atmosphere to prepare the artificial aggregate product, compared with the traditional formula and process for preparing the artificial aggregate at present, the invention has the advantages of energy consumption reduction, emission reduction and the like in the production process, and provides a sustainable development path for carbon utilization in the production and manufacturing process in the building material industry, and has important significance for realizing carbon neutralization in the building material industry.
The foregoing is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention, and therefore, the scope of the present invention shall be defined by the scope of the appended claims.
Claims (7)
1. An artificial aggregate is characterized by comprising the following raw materials: 20-100 parts of air hardening cementing material and 0-80 parts of admixture.
2. An artificial aggregate according to claim 1, wherein the air-setting binder is one of a gamma-C2S binder or a C3S2 binder;
the air hardening cementing material is self-pulverization white cementing material prepared by firing at the temperature of 1200-1450 ℃.
3. An artificial aggregate according to claim 1, wherein the admixture is one or both of fly ash and slag.
4. An artificial aggregate according to claim 1, further comprising an activator, said activator being NaHCO 3 、NaCO 3 And one or more of gypsum.
5. An artificial aggregate according to claim 4, wherein the activator is present in an amount of 4-8% by weight of the starting material.
6. The preparation method of the artificial aggregate is characterized by comprising the following preparation steps:
s1, weighing raw materials according to a proportion, and uniformly mixing the raw materials and putting the mixture into a disc granulator;
s2, opening a disc type granulator to carry out water spraying granulation to obtain aggregate particles; controlling the rotating speed of the disk granulator to be 30-35rpm, and controlling the mass ratio of water to the weight of the raw materials to be 0.15-0.25;
s3, placing the aggregate particles prepared in the step S2 into a carbonization kettle for curing, wherein the curing temperature is room temperature; the relative humidity is 20-95%; carbonization pressure: 0.1-0.3MPa; the concentration of the carbon dioxide is 25% -99%; the carbonization time is 2-10h.
7. The method for preparing artificial aggregate according to claim 6, wherein the particle size of the aggregate particles prepared in the step S2 is 3-10mm.
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