CN115818997A - Organic amine-based rapid carbonization method for construction waste recycled aggregate - Google Patents
Organic amine-based rapid carbonization method for construction waste recycled aggregate Download PDFInfo
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- CN115818997A CN115818997A CN202211422984.3A CN202211422984A CN115818997A CN 115818997 A CN115818997 A CN 115818997A CN 202211422984 A CN202211422984 A CN 202211422984A CN 115818997 A CN115818997 A CN 115818997A
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- 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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Abstract
The invention relates to the technical field of recycled aggregate reinforcement, and discloses a method for quickly carbonizing construction waste recycled aggregate based on organic amine 2 At ambient time, CO 2 In the process of permeating the inside of the aggregate through the pores, the existence of organic amine in the pores of the aggregate can accelerate the gas phase dissolution, especially the promotion of CO 2 The dissolution rate in the pore solution increases the concentration of CO2 in the pore solution, so that the carbonization rate is improved, the aggregate can be quickly carbonized, the problem that the organic amine is easy to remove and volatilize is solved by organic amine grafting, the long-term carbonization capacity of the aggregate is enhanced, and the carbon sequestration efficiency of the building rubbish aggregate is improved.
Description
Technical Field
The invention relates to the technical field of recycled aggregate reinforcement, in particular to a construction waste recycled aggregate rapid carbonization method based on organic amine.
Background
With the continuous acceleration of the urbanization process in China, the construction of civil engineering of high-rise buildings, super high-rise buildings, expressways, large bridges and the like is rapidly developed. However, in the waste construction work, a large amount of waste buildings need to be dismantled, and construction waste, particularly waste cement hardened paste, is generated in a large amount, and is one of the construction waste which is difficult to treat.
The construction waste recycled aggregate becomes a new way for recycling the construction waste. Wherein a certain amount of hardened cement paste is adhered to the surface of a large amount of construction waste recycled aggregate, and cement hydration products (about 70 percent of C-S-H gel products and 20 percent of calcium hydroxide) are easy to react with CO in the air 2 The calcium carbonate belongs to insoluble calcium salt and can be separated out and filled in the pores, so that the compactness and strength of the hardened cement paste are effectively improved, and the carbonization is widely used for improving the performance of the building waste aggregate. However, the common method for carbonizing the aggregate has low carbonization efficiency and long carbonization time of the aggregate, so that the popularization of the method for carbonizing and reinforcing the aggregate is limited, and a new method for quickly carbonizing and reinforcing the aggregate of the construction waste needs to be developed urgently to accelerate the carbonization rate and improve the carbonization efficiency.
Disclosure of Invention
The present invention is directed to overcoming the above and/or other potential problems in the art: lifting deviceProvides a method for quickly carbonizing building waste recycled aggregate based on organic amine, which can effectively accelerate the carbonization rate and improve the carbonization efficiency. The carbonization method can effectively promote CO 2 The dissolution rate in the pore solution is increased, and the CO in the pore solution is increased 2 The concentration of the aggregate is increased, so that the carbonization rate is increased, the aggregate can be quickly carbonized, and the building waste aggregate is strengthened; and the impregnation liquid is heated in the impregnation process, so that organic amine can be firmly grafted on hydration products on the inner wall of the pores of the aggregate through chemical bonds, the problem that the organic amine is easy to remove and volatilize is solved, the continuous and efficient carbonization capacity of the aggregate is ensured, and the carbon sequestration efficiency of the building waste aggregate is effectively improved.
The technical solution of the invention is as follows: a method for quickly carbonizing building garbage regenerated aggregate based on organic amine includes immersing the block containing hardened cement paste in organic amine solution at 40-80 deg.C, taking out, and adding CO 2 And carbonizing and curing in the environment of (1).
Preferably, the block containing the hardened cement paste is pre-soaked with carboxylic acid before being immersed in the organic amine solution.
Preferably, the time of the carboxylic acid soaking pretreatment is more than 4 hours.
Preferably, the dipping time of the organic amine solution is 6 to 48 hours.
Preferably, the organic amine solution is one or a mixture of more than two of methyl glycol amine, ethanolamine, diethanolamine and triethanolamine.
Preferably, the curing time is more than 6 hours.
Preferably, the mass fraction of the organic amine solution is 5% -100%.
The invention has the beneficial effects that: the invention can heat the dipping liquid in the process of dipping the building rubbish aggregate, and the hydroxyl in the organic amine and the hydroxyl on the hydration product of the cement paste on the inner wall of the pore in the building rubbish aggregate are subjected to dehydration reaction, so that the organic amine can be firmly grafted on the hydration product of the inner wall of the pore through the chemical bond effect, thereby solving the problem that the organic amine is easy to remove and volatilizeAnd the continuous efficient carbonization capability of the cement hardened slurry is further enhanced, and the carbon fixation efficiency and strength of the building waste aggregate are improved. Placing the aggregate in a container containing CO 2 During environmental conservation, CO 2 In the process of permeating pores into the pores of the aggregate, the existence of organic amine in the pores can accelerate gas phase dissolution, especially improve CO 2 The dissolution rate in the pore solution is increased, and the CO in the pore solution is increased 2 Concentration, thereby improving the carbonization rate, and leading the aggregate to be capable of being quickly carbonized, thereby strengthening the aggregate of the construction waste.
Drawings
FIG. 1 is a cross-sectional comparison of construction waste aggregate treated with methyldialanolamine as the impregnating solution in example 2 and the blank aggregate in comparative example 1.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.
Example 1
Soaking the building garbage blocks containing hardened cement paste in organic amine solution at 40-80 deg.C for 6-48 hr, taking out, and adding CO 2 The carbonization curing is carried out in the environment, and the curing time is more than 6 hours.
When the building garbage aggregate containing the hardened cement paste is immersed in the organic amine solution, organic amine is adsorbed in the cracks, communicated and semi-communicated pores in the hardened cement paste under the action of capillary force; in the dipping process of the organic amine solution, the dipping temperature is 40-80 ℃, and at the dipping temperature, the hydroxyl in the organic amine and the hydroxyl on the hydration product of the cement slurry on the inner wall of the pore in the building waste aggregate are subjected to dehydration reaction, so that the organic amine can be firmly grafted on the hydration product of the inner wall of the pore through chemical bonds, the problem that the organic amine is easy to remove and volatilize is solved, the continuous high-efficiency carbonization capability of the cement hardened slurry is further enhanced, and the carbon fixation efficiency of the building waste aggregate is improved. Placing the impregnated construction waste aggregate in a container containing CO 2 During environmental conservation, CO 2 Penetration through poresInside the pores of the aggregate, the existence of organic amine inside the pores can accelerate gas phase dissolution, especially enhance CO 2 Dissolving in the pore solution to increase CO in the pore solution 2 And the concentration is higher than the concentration of the cement slurry, so that the construction waste aggregate is carbonized and strengthened, and the construction waste aggregate containing the hardened cement slurry is quickly carbonized.
The dipping liquid and the aggregate are heated in the process of pretreating and dipping the building garbage aggregate by the organic amine, so that the organic amine is firmly grafted on hydration products on the inner wall of the aggregate pore or sites generated by pretreatment through chemical bonds, the problem that the organic amine is easy to remove and volatilize in the carbonization process is solved, and CO is effectively promoted 2 The dissolution rate in the pore solution is continued, and the CO in the pore solution is increased 2 Concentration, thereby promoting the carbonization rate, and enabling the aggregate to be continuously and rapidly carbonized, thereby rapidly strengthening the construction waste aggregate. The method enhances the continuous high-efficiency and long-term carbonization capacity of the aggregate, and improves the carbon fixation efficiency and capacity of the building waste aggregate.
In this embodiment, before the massive construction waste aggregate is soaked in the organic amine solution, the construction waste aggregate may be pretreated by soaking in carboxylic acid, and the carboxylic acid reacts with the hydration product in the construction waste cement slurry to decalcify the hydration product and generate calcium carboxylate, thereby reducing the decalcification process of the hydration product during carbonization and accelerating carbonization. In addition, carboxylic acid reacts with hydration products, closed pore channels can be opened, and CO can be increased 2 The infiltration efficiency is improved, so that the carbonization is further accelerated, and the internal pore structure of the building waste aggregate is optimized; and most importantly, the reaction of the carboxylic acid and the hydration product leads the hydration product to break bonds due to decalcification, so that a large amount of silicon hydroxyl and aluminum hydroxyl are generated, a large amount of new grafting sites are provided for the subsequent grafting of the organic amine on the surface of the block, and the stability of the organic amine grafting is further ensured.
In this embodiment, the organic amine solution is one or a mixture of two or more of methyldiethanolamine, ethanolamine, diethanolamine, and triethanolamine.
Example 2
And soaking the building garbage blocks containing the hardened cement paste into a 10% methyl glycol amine solution at the soaking temperature of 80 ℃ for 24 hours.
Example 3
Pre-dipping the building garbage block containing the hardened cement paste into a 4% acetic acid solution for pretreatment for 6 hours; then, the substrate was immersed in a 10% by mass solution of methyl glycol amine at 80 ℃ for 24 hours.
Comparative example 1
The building garbage blocks containing the hardened cement paste are soaked in water at the soaking temperature of 80 ℃ for 24 hours.
The samples obtained in examples 2 to 3 and comparative example 1 were subjected to tests of carbonization depth, water absorption and crush value, and compared with age-matched standard cured test pieces as a reference group; the carbonization test is carried out according to GB/T50082-2009 test method Standard for testing long-term performance and durability of ordinary concrete, after the humidity of the two is 70% and the concentration of carbon dioxide is 20%, alcohol phenolphthalein is sprayed on the two, and as shown in figure 1, a left sample is obtained by adopting methyl glycol amine as an impregnating solution to impregnate for 24 hours in example 2. The right sample was obtained in comparative example 1 by dipping in water as a dipping solution for 24 hours, and it was found that the sample was completely carbonized by the carbonization method of the present invention, whereas the carbonization depth without the carbonization method of the present invention was about 3mm (dark portion of the right sample was phenolphthalein developed, light portion was stone). The specific test data results are shown in the following table:
the above test data show that: organic amine is used for carrying out organic amine impregnation at 80 ℃ on the construction waste aggregate containing the hardened cement paste, and carbonization maintenance is carried out on the impregnated construction waste, so that the carbonization rate of the construction waste aggregate can be effectively improved, and the rapid carbonization of the construction waste recycled aggregate is realized. Before the massive construction waste aggregates are soaked by the organic amine solution, the construction waste aggregates are soaked by carboxylic acid for pretreatment, so that carbonization can be further accelerated.
The above are merely characteristic embodiments of the present invention, and do not limit the scope of the present invention in any way. All technical solutions formed by equivalent exchanges or equivalent substitutions fall within the protection scope of the present invention.
Claims (7)
1. The method for quickly carbonizing the building garbage recycled aggregate based on organic amine is characterized in that a block containing hardened cement paste is soaked in organic amine solution at the temperature of 40-80 ℃, and taken out and then contains CO 2 And carbonizing and curing in the environment of (1).
2. The organic amine-based construction waste recycled aggregate rapid carbonization method according to claim 1, characterized in that: the blocks containing the hardened cement paste are pre-soaked with carboxylic acid prior to dipping the blocks in the organic amine solution.
3. The organic amine-based construction waste recycled aggregate rapid carbonization method according to claim 2, characterized in that: the time of the carboxylic acid soaking pretreatment is more than 4 hours.
4. The method for quickly carbonizing construction waste recycled aggregate based on organic amine according to claim 1, characterized in that: the soaking time of the block with the organic amine solution is 6 to 48 hours.
5. The method for rapidly carbonizing construction waste recycled aggregate based on organic amine according to any one of claims 1 to 4, characterized in that: the organic amine solution is one or a mixture of more than two of methyl glycol amine, ethanolamine, diethanolamine and triethanolamine.
6. The method for quickly carbonizing construction waste recycled aggregate based on organic amine according to any one of claim 5, characterized by comprising: the curing time is more than 6 hours.
7. The method for quickly carbonizing construction waste recycled aggregate based on organic amine according to any one of claims 5, characterized in that: the mass fraction of the organic amine solution is 5-100%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116968175A (en) * | 2023-09-22 | 2023-10-31 | 北京工业大学 | Mixing method for improving carbon fixation effect of cement-based material |
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| CN103693876A (en) * | 2013-12-01 | 2014-04-02 | 内蒙古大学 | High-quality treatment method for recycled coarse cement concrete aggregate |
| WO2021074003A1 (en) * | 2019-10-18 | 2021-04-22 | Heidelbergcement Ag | Integrated process for manufacturing hydraulically hardening building material |
| CN114426419A (en) * | 2022-04-01 | 2022-05-03 | 北京锦绣新技术发展有限公司 | Method for storing carbon dioxide in inorganic solid waste ceramsite mineralized concrete |
| CN114907040A (en) * | 2022-04-20 | 2022-08-16 | 北京锦绣新技术发展有限公司 | Method for removing carbon dioxide by grinding solid waste |
| CN114988749A (en) * | 2022-07-18 | 2022-09-02 | 北京工业大学 | Resource utilization method for capturing carbon dioxide |
| CN115093149A (en) * | 2022-05-30 | 2022-09-23 | 湖北工业大学 | Method for preparing efficient steam-cured carbonized brick from alcohol amine |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103693876A (en) * | 2013-12-01 | 2014-04-02 | 内蒙古大学 | High-quality treatment method for recycled coarse cement concrete aggregate |
| WO2021074003A1 (en) * | 2019-10-18 | 2021-04-22 | Heidelbergcement Ag | Integrated process for manufacturing hydraulically hardening building material |
| CN114426419A (en) * | 2022-04-01 | 2022-05-03 | 北京锦绣新技术发展有限公司 | Method for storing carbon dioxide in inorganic solid waste ceramsite mineralized concrete |
| CN114907040A (en) * | 2022-04-20 | 2022-08-16 | 北京锦绣新技术发展有限公司 | Method for removing carbon dioxide by grinding solid waste |
| CN115093149A (en) * | 2022-05-30 | 2022-09-23 | 湖北工业大学 | Method for preparing efficient steam-cured carbonized brick from alcohol amine |
| CN114988749A (en) * | 2022-07-18 | 2022-09-02 | 北京工业大学 | Resource utilization method for capturing carbon dioxide |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116968175A (en) * | 2023-09-22 | 2023-10-31 | 北京工业大学 | Mixing method for improving carbon fixation effect of cement-based material |
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