Utilization of carbide slag in autoclaved aerated concrete (CS-AAC) and optimization: Foaming, hydration process, and physic-mechanical properties
Autoclaved aerated concrete (AAC), a lightweight porous material, has been widely used in the building field because of its energy savings. A solid waste called carbide slag with a high Ca(OH)2 content is a potential substitution for CaO to prepare AAC. In this study, carbide slag was used to replac...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-12-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S221450952300534X |
| _version_ | 1797454652057321472 |
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| author | Daosheng Sun Feixiang Yin Yang Deng Kaiwei Liu Jinhui Tang Chengzhe Shen Yawen Sun Aiguo Wang Niuniu Huang Cheng Hu |
| author_facet | Daosheng Sun Feixiang Yin Yang Deng Kaiwei Liu Jinhui Tang Chengzhe Shen Yawen Sun Aiguo Wang Niuniu Huang Cheng Hu |
| author_sort | Daosheng Sun |
| collection | DOAJ |
| description | Autoclaved aerated concrete (AAC), a lightweight porous material, has been widely used in the building field because of its energy savings. A solid waste called carbide slag with a high Ca(OH)2 content is a potential substitution for CaO to prepare AAC. In this study, carbide slag was used to replace quicklime to prepare carbide slag-based autoclaved aerated concrete (CS-AAC). The temperature, foaming rate, and rheological properties of the slurry during the foaming stage, the strength of the rough body, and the physical and mechanical properties of the autoclaved products were investigated. Hydration products, microstructure, and pore structure were further analyzed to investigate the mechanisms of carbide slag on the properties of AAC, and the use of sodium carbonate (SC) to improve the performance of CS-AAC was explored. The results show that the addition of carbide slag causes a degradation of the properties, including foaming rate and physic-mechanical properties. The “water locking” effect due to the irregular surface of the carbide slag results in an increase in slurry consistency. The increase in slurry consistency, as well as the decrease in slurry temperature is the main reason for the decrease in slurry foaming rate and roundness of bubbles, which are unfavorable for the strength development of AAC. Due to the alkali excitation characteristics of sodium carbonate. The addition of SC can react with Ca(OH)2 in the slurry to produce OH-, to promote cement hydration, which can accelerate the development of rough body strength, and save pre-curing time. The carbide slag-based AAC with 0.25% SC has a significant improvement in foaming properties and facilitates the generation of more C-S-H gels to form tobermorite under hydrothermal conditions, which improves the AAC properties. However, too much SC can consume a large amount of Ca(OH)2 and affects the production of tobermorite, which is not beneficial to the mechanical properties. |
| first_indexed | 2024-03-09T15:40:10Z |
| format | Article |
| id | doaj.art-c1b93fed9a6f48d0906b3dd098a5d6df |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-09T15:40:10Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-c1b93fed9a6f48d0906b3dd098a5d6df2023-11-25T04:48:25ZengElsevierCase Studies in Construction Materials2214-50952023-12-0119e02354Utilization of carbide slag in autoclaved aerated concrete (CS-AAC) and optimization: Foaming, hydration process, and physic-mechanical propertiesDaosheng Sun0Feixiang Yin1Yang Deng2Kaiwei Liu3Jinhui Tang4Chengzhe Shen5Yawen Sun6Aiguo Wang7Niuniu Huang8Cheng Hu9Anhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, ChinaAnhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, ChinaShanxi Fuping Eco-cement CO., LTD, Weinan 711709, ChinaAnhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, China; Corresponding author.School of Materials Science and Engineering, Southeast University, Nanjing 211189, ChinaAnhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, ChinaAnhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, ChinaAnhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, ChinaAnhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, ChinaAnhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei 230022, ChinaAutoclaved aerated concrete (AAC), a lightweight porous material, has been widely used in the building field because of its energy savings. A solid waste called carbide slag with a high Ca(OH)2 content is a potential substitution for CaO to prepare AAC. In this study, carbide slag was used to replace quicklime to prepare carbide slag-based autoclaved aerated concrete (CS-AAC). The temperature, foaming rate, and rheological properties of the slurry during the foaming stage, the strength of the rough body, and the physical and mechanical properties of the autoclaved products were investigated. Hydration products, microstructure, and pore structure were further analyzed to investigate the mechanisms of carbide slag on the properties of AAC, and the use of sodium carbonate (SC) to improve the performance of CS-AAC was explored. The results show that the addition of carbide slag causes a degradation of the properties, including foaming rate and physic-mechanical properties. The “water locking” effect due to the irregular surface of the carbide slag results in an increase in slurry consistency. The increase in slurry consistency, as well as the decrease in slurry temperature is the main reason for the decrease in slurry foaming rate and roundness of bubbles, which are unfavorable for the strength development of AAC. Due to the alkali excitation characteristics of sodium carbonate. The addition of SC can react with Ca(OH)2 in the slurry to produce OH-, to promote cement hydration, which can accelerate the development of rough body strength, and save pre-curing time. The carbide slag-based AAC with 0.25% SC has a significant improvement in foaming properties and facilitates the generation of more C-S-H gels to form tobermorite under hydrothermal conditions, which improves the AAC properties. However, too much SC can consume a large amount of Ca(OH)2 and affects the production of tobermorite, which is not beneficial to the mechanical properties.http://www.sciencedirect.com/science/article/pii/S221450952300534XCarbide slagAutoclaved aerated concreteSlurry propertyPore distributionTobermorite |
| spellingShingle | Daosheng Sun Feixiang Yin Yang Deng Kaiwei Liu Jinhui Tang Chengzhe Shen Yawen Sun Aiguo Wang Niuniu Huang Cheng Hu Utilization of carbide slag in autoclaved aerated concrete (CS-AAC) and optimization: Foaming, hydration process, and physic-mechanical properties Case Studies in Construction Materials Carbide slag Autoclaved aerated concrete Slurry property Pore distribution Tobermorite |
| title | Utilization of carbide slag in autoclaved aerated concrete (CS-AAC) and optimization: Foaming, hydration process, and physic-mechanical properties |
| title_full | Utilization of carbide slag in autoclaved aerated concrete (CS-AAC) and optimization: Foaming, hydration process, and physic-mechanical properties |
| title_fullStr | Utilization of carbide slag in autoclaved aerated concrete (CS-AAC) and optimization: Foaming, hydration process, and physic-mechanical properties |
| title_full_unstemmed | Utilization of carbide slag in autoclaved aerated concrete (CS-AAC) and optimization: Foaming, hydration process, and physic-mechanical properties |
| title_short | Utilization of carbide slag in autoclaved aerated concrete (CS-AAC) and optimization: Foaming, hydration process, and physic-mechanical properties |
| title_sort | utilization of carbide slag in autoclaved aerated concrete cs aac and optimization foaming hydration process and physic mechanical properties |
| topic | Carbide slag Autoclaved aerated concrete Slurry property Pore distribution Tobermorite |
| url | http://www.sciencedirect.com/science/article/pii/S221450952300534X |
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