CN115534082A - Method for improving carbonization degree of non-hydraulic cementing material - Google Patents
Method for improving carbonization degree of non-hydraulic cementing material Download PDFInfo
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- CN115534082A CN115534082A CN202211178623.9A CN202211178623A CN115534082A CN 115534082 A CN115534082 A CN 115534082A CN 202211178623 A CN202211178623 A CN 202211178623A CN 115534082 A CN115534082 A CN 115534082A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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Abstract
The invention discloses a method for improving the carbonization degree of a non-hydraulic cementing material. The carbonization condition of the invention is continuously adjusted along with the change of the carbonization time, so that CO is obtained 2 The carbon material can permeate into the inner side of the product to participate in reaction to form a gradient structure which is gradually compacted from inside to outside, so that the carbonization degree of the interior of a carbonized product is improved; the adopted maintenance process is simple, the strength of the carbonized product of the carbon absorption cementing material can be greatly improved, and the carbonization reaction can be promoted to obtain higher carbonization degree; in addition, CO can be absorbed in a large amount in the carbonization process 2 The carbon emission of the building material is reduced; the adopted maintenance process is suitable for all carbonized products, and has wide application range and strong universality.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a method for improving the carbonization degree of a non-hydraulic cementing material.
Background
The cement concrete is the engineering material with the largest use amount and the widest application range in the world building engineering. However, the decomposition of raw materials and the combustion of fossil fuels during the cement production process generate a large amount of carbon dioxide gas, which causes certain environmental problems. The data show that the annual emission of the cement industry in 2019 is about 13.2 hundred million tons, and the cement industry occupies industrial enterprises in ChinaIndustry CO 2 15% of the total discharge.
Along with the gradual increase of the carbonization process, the mineral solidifies CO 2 Is also getting more and more hot. Studies have shown that almost all calcium silicate minerals can react with CO 2 The calcium silicate mineral without hydration activity can pass through high concentration CO 2 The activity of the material is excited, so that certain mechanical properties are obtained. However, since the degree of carbonation reaction is influenced by the porosity of the blank and the forming pressure, size and shape, carbon dioxide is likely to be unable to penetrate into the large-sized blank test piece to participate in the reaction. Therefore, it is necessary to increase the carbonation level of the carbon absorbent gelling material to activate the carbonation reaction.
Aiming at the problem of limited carbonization depth of the carbonization hardening material, the adjustment and control of the size and the shape of the carbonization hardening product are common solutions in China at present. However, this method is not suitable for application of the carbon-absorbing cementitious material. In terms of maintenance process, chinese patent CN 108340480 discloses a method for curing concrete blocks by using carbon dioxide gradient mineralization, which improves the utilization rate of carbon dioxide gas in the existing mineralization-strengthening maintenance process, but the method only considers the pressure of carbon dioxide, does not comprehensively consider the influence of humidity and concentration on mineralization maintenance, and therefore needs further intensive research. Techniques for enhancing the carbonization performance of carbon-absorbing cementitious materials are continually being explored and optimized.
Introducing high-concentration CO into the carbonized and hardened cementing material product 2 The surface layer then forms a dense calcium carbonate product, which limits CO 2 Affects the degree of carbonation and thus the product properties. At present, the common improvement measure is to make the carbonized hardening type cementing material into a hollow structure product to ensure the performance of a carbonized product, but the application of the carbonized hardening type cementing material in the building engineering is greatly limited by the measure. At present, the research on the carbonization curing process is not comprehensive and systematic enough, and a curing system needs to be further optimized to fully exert the carbonization activity of a carbonization hardening material so as to improve the performance of a carbonized product.
Disclosure of Invention
The invention aims to provide a method for improving the carbonization degree of a non-hydraulic cementing material, which further improves the reaction degree of carbonized products of the non-hydraulic cementing material by optimizing a curing process, optimizes the carbonization degree of a carbonization hardening type cementing material, and enlarges the application of the carbonization hardening type cementing material in the field of building materials, and adopts the following technical scheme:
according to one aspect of the present invention, there is provided a process for increasing the degree of carbonation of a non-hydraulic cementitious material, comprising the steps of:
the method comprises the following steps:
uniformly mixing a non-hydraulic cementing material with water;
pressing under certain forming pressure to prepare the ligand;
carbonizing and curing the ligand in three stages, wherein each stage is placed under the conditions of certain carbonization humidity, carbonization concentration and pressure for 8 hours to obtain a carbonized product with high carbonization degree; wherein, carbonization humidity, concentration and pressure are changed in a step shape along with the increase of carbonization time.
Preferably, the molding pressure is 3 to 10MPa.
Preferably, the first-stage curing conditions of carbonization curing are as follows: the curing humidity is 40-60%, the carbon dioxide concentration is 20-60%, the carbonization pressure is 0.01-0.1MPa, and the carbonization time is 0.5-1h.
Preferably, the second stage of carbonization curing conditions are as follows: curing humidity is 60-80%, carbon dioxide concentration is 60-80%, carbonization pressure is 0.1-0.2MPa, and carbonization time is 1-3h.
Preferably, the curing conditions in the third stage of carbonization curing are as follows: curing humidity of 80-99%, carbon dioxide concentration of 80-99%, carbonization pressure of 0.2-0.5MPa, and carbonization time of 3-8h.
The technical scheme adopted by the invention has the following remarkable effects:
(1) The carbonization condition of the invention is continuously adjusted along with the change of the carbonization time, so that CO is generated 2 Can permeate into the inner side of the product to participate in reaction to form a gradient structure which is gradually compacted from inside to outside, thereby improving the internal performance of the carbonized productThe degree of carbonization;
(2) The maintenance process adopted by the invention is simple, the strength of the carbonized product of the carbon absorption cementing material can be greatly improved, and the carbonization reaction can be promoted to obtain higher carbonization degree; in addition, a large amount of CO can be absorbed in the carbonization process 2 The carbon emission of the building material is reduced;
(3) The maintenance process adopted by the invention is suitable for all carbonized products, and has wide application range and strong universality.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
Example 1
Mixing the non-hydraulic cementing material with the particle size of less than 75 microns with water according to the water-to-gel ratio of 0.10 uniformly, and pressing the mixture into a cylinder with the diameter of 2cm and the height of 2cm under the molding pressure of 3 MPa. Respectively carrying out carbonization curing under different curing conditions. The solid carbon content is measured by means of thermal analysis.
The first stage is as follows: the concentration of carbon dioxide is 50%, the curing humidity is 45%, the carbonization pressure is 0.02MPa, and the curing time is 0.5h; and a second stage: the carbon dioxide concentration is 75%, the curing humidity is 75%, the carbonization pressure is 0.1MPa, and the curing is carried out for 1.5h; and a third stage: the carbon dioxide concentration is 99 percent, the curing humidity is 95 percent, the carbonization pressure is 0.2MPa, and the curing is carried out for 6 hours.
Example 2
Mixing the non-hydraulic cementing material with the particle size of less than 75 microns with water according to the water-to-gel ratio of 0.10 uniformly, and pressing the mixture into a cylinder with the diameter of 2cm and the height of 2cm under the molding pressure of 3 MPa. Respectively carrying out carbonization curing under different curing conditions. The solid carbon content is measured by means of thermal analysis.
The first stage is as follows: the carbon dioxide concentration is 25%, the curing humidity is 45%, the carbonization pressure is 0.1MPa, and the curing is carried out for 1h; and a second stage: the carbon dioxide concentration is 75%, the curing humidity is 75%, the carbonization pressure is 0.15MPa, and the curing is carried out for 2 hours; and a third stage: the carbon dioxide concentration is 99%, the curing humidity is 95%, the carbonization pressure is 0.3MPa, and the curing is carried out for 3h.
Example 3
Mixing the non-hydraulic cementing material with the particle size of less than 75 microns with water according to the water-to-glue ratio of 0.10 uniformly, and pressing into a cylinder with the diameter of 2cm and the height of 2cm under the forming pressure of 3 MPa. Respectively carrying out carbonization curing under different curing conditions. The solid carbon content is measured by means of thermal analysis.
The first stage is as follows: the carbon dioxide concentration is 50%, the curing humidity is 25%, the carbonization pressure is 0.05MPa, and the curing is carried out for 0.5h; and a second stage: the carbon dioxide concentration is 75%, the curing humidity is 75%, the carbonization pressure is 0.2MPa, and the curing is carried out for 2.5h. The carbon dioxide concentration is 99%, the curing humidity is 95%, the carbonization pressure is 0.25MPa, and the curing is carried out for 5 hours.
Comparative example 1
Constant-humidity curing is adopted, and the curing humidity is 95%. Other carbonization curing conditions were the same as in example 1.
Comparative example 2
Maintaining at constant concentration of 50%. Other carbonization curing conditions were the same as in example 2.
Comparative example 3
Constant pressure maintenance is adopted, and the maintenance pressure is 0.2MPa. Other carbonization curing conditions were the same as in example 3.
Comparative example 4
The carbonization and maintenance process is carried out in two stages. The first stage is as follows: the carbon dioxide concentration is 75%, the curing humidity is 75%, the carbonization pressure is 0.1MPa, and the curing is carried out for 2 hours; and a second stage: the carbon dioxide concentration is 99%, the curing humidity is 95%, the carbonization pressure is 0.2MPa, and the curing is carried out for 6 hours.
TABLE 1
The results of comparison between the carbonization results of the above examples and comparative examples are shown in Table 1, and examples 1-3 demonstrate that the conditions of curing humidity, carbon dioxide concentration, carbonization pressure, etc. have certain influence on carbonization curing, and the carbonization degree of the non-hydraulic cementing material can be improved by the curing method proposed in this patent; comparative example 4 shows that the carbonization process is simplified and the carbonization performance of the non-hydraulic cementing material is improved to the best extent when the carbonization curing is carried out in three stages.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (5)
1. A method for increasing the carbonization degree of a non-hydraulic cementing material, which is characterized in that: the method comprises the following steps:
uniformly mixing a non-hydraulic cementing material with water;
pressing under certain forming pressure to prepare the ligand;
carbonizing and curing the ligand in three stages, wherein each stage is placed under the conditions of certain carbonization humidity, carbonization concentration and pressure for 8 hours to obtain a carbonized product with high carbonization degree; wherein, carbonization humidity, concentration and pressure are changed in a step shape along with the increase of carbonization time.
2. A method for increasing the carbonization degree of a non-hydraulic cement according to claim 1, characterized in that: the molding pressure is 3-10MPa.
3. A method for increasing the carbonation level of a non-hydraulic cementitious material according to claim 1, characterised in that: the first-stage curing conditions of carbonization curing are as follows: the curing humidity is 40-60%, the carbon dioxide concentration is 20-60%, the carbonization pressure is 0.01-0.1MPa, and the carbonization time is 0.5-1h.
4. A method for increasing the carbonization degree of a non-hydraulic cement according to claim 1, characterized in that: the second-stage curing conditions of carbonization curing are as follows: curing humidity is 60-80%, carbon dioxide concentration is 60-80%, carbonization pressure is 0.1-0.2MPa, and carbonization time is 1-3h.
5. A method for increasing the carbonation level of a non-hydraulic cementitious material according to claim 1, characterised in that: the curing conditions of the third stage of carbonization curing are as follows: the curing humidity is 80-99%, the carbon dioxide concentration is 80-99%, the carbonization pressure is 0.2-0.5MPa, and the carbonization time is 3-8h.
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| CN202211178623.9A CN115534082A (en) | 2022-09-27 | 2022-09-27 | Method for improving carbonization degree of non-hydraulic cementing material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116924827A (en) * | 2023-07-19 | 2023-10-24 | 山东汉博昱洲新材料有限公司 | Cracking-preventing maintenance method for carbon mineralized product |
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2022
- 2022-09-27 CN CN202211178623.9A patent/CN115534082A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116924827A (en) * | 2023-07-19 | 2023-10-24 | 山东汉博昱洲新材料有限公司 | Cracking-preventing maintenance method for carbon mineralized product |
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