Durability of alkali-activated materials with different C–S–H and N-A-S-H gels in acid and alkaline environment
This work explores the durability of alkali-activated materials exposed to acidic and alkaline environments to analyze and evaluate their applications. The alkali-activated materials of metakaolin and metakaolin-mine tailings were immersed in solutions of different pH values for 90 days, in which th...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-01-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785421014745 |
| _version_ | 1819261374375657472 |
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| author | Min Yang Yanjin Zheng Xing Li Xiaojun Yang Feng Rao Lele Zhong |
| author_facet | Min Yang Yanjin Zheng Xing Li Xiaojun Yang Feng Rao Lele Zhong |
| author_sort | Min Yang |
| collection | DOAJ |
| description | This work explores the durability of alkali-activated materials exposed to acidic and alkaline environments to analyze and evaluate their applications. The alkali-activated materials of metakaolin and metakaolin-mine tailings were immersed in solutions of different pH values for 90 days, in which the durability of materials was studied. Characterizations include pH, FTIR, XRD, SEM and 29Si NMR measurements. It was found that the alkali-excited materials have good durability in an alkaline environment. A small amount of lye was diluted in the neutral solution, leading to a decrease in the amount of gel and a slight deterioration of the durability of the materials. Moreover, alkali-activated materials were corroded in acidic environments, leading to poor durability because hydrogen ions (H+) attacked N-A-S-H and C-A-S-H gels, and production of new sinjarite (CaCl2) mineral phases. This work provides a scientific reference value for the application of alkali-activated materials in daily environment. |
| first_indexed | 2024-12-23T19:40:47Z |
| format | Article |
| id | doaj.art-572df03c7a9f4cbbbba7137a0c9b81bb |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-23T19:40:47Z |
| publishDate | 2022-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-572df03c7a9f4cbbbba7137a0c9b81bb2022-12-21T17:33:40ZengElsevierJournal of Materials Research and Technology2238-78542022-01-0116619630Durability of alkali-activated materials with different C–S–H and N-A-S-H gels in acid and alkaline environmentMin Yang0Yanjin Zheng1Xing Li2Xiaojun Yang3Feng Rao4Lele Zhong5Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resource Key Laboratory of Sichuan Province, Chengdu, Sichuan, 610081, China; Chengdu Analytical & Testing Center, Sichuan Bureau of Geology & Mineral Resources, Chengdu, Sichuan, 610081, ChinaSchool of Zijin Mining, Fuzhou University, Fuzhou, Fujian, 350108, ChinaSchool of Zijin Mining, Fuzhou University, Fuzhou, Fujian, 350108, ChinaEvaluation and Utilization of Strategic Rare Metals and Rare Earth Resource Key Laboratory of Sichuan Province, Chengdu, Sichuan, 610081, China; Chengdu Analytical & Testing Center, Sichuan Bureau of Geology & Mineral Resources, Chengdu, Sichuan, 610081, ChinaSchool of Zijin Mining, Fuzhou University, Fuzhou, Fujian, 350108, ChinaEvaluation and Utilization of Strategic Rare Metals and Rare Earth Resource Key Laboratory of Sichuan Province, Chengdu, Sichuan, 610081, China; Chengdu Analytical & Testing Center, Sichuan Bureau of Geology & Mineral Resources, Chengdu, Sichuan, 610081, China; Corresponding author.This work explores the durability of alkali-activated materials exposed to acidic and alkaline environments to analyze and evaluate their applications. The alkali-activated materials of metakaolin and metakaolin-mine tailings were immersed in solutions of different pH values for 90 days, in which the durability of materials was studied. Characterizations include pH, FTIR, XRD, SEM and 29Si NMR measurements. It was found that the alkali-excited materials have good durability in an alkaline environment. A small amount of lye was diluted in the neutral solution, leading to a decrease in the amount of gel and a slight deterioration of the durability of the materials. Moreover, alkali-activated materials were corroded in acidic environments, leading to poor durability because hydrogen ions (H+) attacked N-A-S-H and C-A-S-H gels, and production of new sinjarite (CaCl2) mineral phases. This work provides a scientific reference value for the application of alkali-activated materials in daily environment.http://www.sciencedirect.com/science/article/pii/S2238785421014745Alkali activated materialspHAlkali dissolutionLeaching concentrationAcid corrosionAlkali corrosion |
| spellingShingle | Min Yang Yanjin Zheng Xing Li Xiaojun Yang Feng Rao Lele Zhong Durability of alkali-activated materials with different C–S–H and N-A-S-H gels in acid and alkaline environment Journal of Materials Research and Technology Alkali activated materials pH Alkali dissolution Leaching concentration Acid corrosion Alkali corrosion |
| title | Durability of alkali-activated materials with different C–S–H and N-A-S-H gels in acid and alkaline environment |
| title_full | Durability of alkali-activated materials with different C–S–H and N-A-S-H gels in acid and alkaline environment |
| title_fullStr | Durability of alkali-activated materials with different C–S–H and N-A-S-H gels in acid and alkaline environment |
| title_full_unstemmed | Durability of alkali-activated materials with different C–S–H and N-A-S-H gels in acid and alkaline environment |
| title_short | Durability of alkali-activated materials with different C–S–H and N-A-S-H gels in acid and alkaline environment |
| title_sort | durability of alkali activated materials with different c s h and n a s h gels in acid and alkaline environment |
| topic | Alkali activated materials pH Alkali dissolution Leaching concentration Acid corrosion Alkali corrosion |
| url | http://www.sciencedirect.com/science/article/pii/S2238785421014745 |
| work_keys_str_mv | AT minyang durabilityofalkaliactivatedmaterialswithdifferentcshandnashgelsinacidandalkalineenvironment AT yanjinzheng durabilityofalkaliactivatedmaterialswithdifferentcshandnashgelsinacidandalkalineenvironment AT xingli durabilityofalkaliactivatedmaterialswithdifferentcshandnashgelsinacidandalkalineenvironment AT xiaojunyang durabilityofalkaliactivatedmaterialswithdifferentcshandnashgelsinacidandalkalineenvironment AT fengrao durabilityofalkaliactivatedmaterialswithdifferentcshandnashgelsinacidandalkalineenvironment AT lelezhong durabilityofalkaliactivatedmaterialswithdifferentcshandnashgelsinacidandalkalineenvironment |