Durability of Red Mud-Coal Metakaolin Geopolymer in Long-term Sulfuric Acid Corrosion Environment
Red mud and coal metakaolin were used as raw materials, and a mixed solution of sodium silicate and sodium hydroxide was used as an activator to prepare red mud-coal metakaolin geopolymers(RCG) specimens. The acid corrosion resistance of the specimens after 7 days of curing in a sulfuric acid soluti...
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| Format: | Article |
| Language: | English |
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Editorial Office of Journal of Taiyuan University of Technology
2021-09-01
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| Series: | Taiyuan Ligong Daxue xuebao |
| Subjects: | |
| Online Access: | https://tyutjournal.tyut.edu.cn/englishpaper/show-335.html |
| _version_ | 1797216696635752448 |
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| author | Liming GAO Tao WU Tiantian GUO Bin HE Fuli MA Xiaohong BAI |
| author_facet | Liming GAO Tao WU Tiantian GUO Bin HE Fuli MA Xiaohong BAI |
| author_sort | Liming GAO |
| collection | DOAJ |
| description | Red mud and coal metakaolin were used as raw materials, and a mixed solution of sodium silicate and sodium hydroxide was used as an activator to prepare red mud-coal metakaolin geopolymers(RCG) specimens. The acid corrosion resistance of the specimens after 7 days of curing in a sulfuric acid solution with pH=2 for 3-112 days was explored. The results of compressive strength, X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) of the specimens reveal that the polymerization reaction of RCGis almost finished after being soaked in acid for 14 days. Under the acidic environment, the geopolymer depolymerized and formed cracks in the internal structure, resulting in its gradual decreasein compressive strength with the immersion time. The stress-strain curve of RCG under different immersion time in acid solution exhibited significant difference in the rising section, and the slope and peak stress of the rising section first increased and then decreased with the immersion time. There was a good correlation between the elastic modulus and the compressive strength during the immersion process. Based on the compound power exponential nonlinear model, and by taking into account the factors of long-term immersion, the relationship between the parameters of the model and the immersion age D(D≥14 d) was established, which provides a new method for the study of the stress-strain curve of red mud-coal metakaolin geopolymer under long-term corrosion by sulfuric acid. |
| first_indexed | 2024-04-24T11:50:04Z |
| format | Article |
| id | doaj.art-595f006caf2146e4965b87e9605fb1b2 |
| institution | Directory Open Access Journal |
| issn | 1007-9432 |
| language | English |
| last_indexed | 2024-04-24T11:50:04Z |
| publishDate | 2021-09-01 |
| publisher | Editorial Office of Journal of Taiyuan University of Technology |
| record_format | Article |
| series | Taiyuan Ligong Daxue xuebao |
| spelling | doaj.art-595f006caf2146e4965b87e9605fb1b22024-04-09T08:04:07ZengEditorial Office of Journal of Taiyuan University of TechnologyTaiyuan Ligong Daxue xuebao1007-94322021-09-0152583083610.16355/j.cnki.issn1007-9432tyut.2021.05.0191007-9432(2021)05-0830-07Durability of Red Mud-Coal Metakaolin Geopolymer in Long-term Sulfuric Acid Corrosion EnvironmentLiming GAO0Tao WU1Tiantian GUO2Bin HE3Fuli MA4Xiaohong BAI5College of Civil engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Civil engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Civil engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Civil engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Civil engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Civil engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaRed mud and coal metakaolin were used as raw materials, and a mixed solution of sodium silicate and sodium hydroxide was used as an activator to prepare red mud-coal metakaolin geopolymers(RCG) specimens. The acid corrosion resistance of the specimens after 7 days of curing in a sulfuric acid solution with pH=2 for 3-112 days was explored. The results of compressive strength, X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) of the specimens reveal that the polymerization reaction of RCGis almost finished after being soaked in acid for 14 days. Under the acidic environment, the geopolymer depolymerized and formed cracks in the internal structure, resulting in its gradual decreasein compressive strength with the immersion time. The stress-strain curve of RCG under different immersion time in acid solution exhibited significant difference in the rising section, and the slope and peak stress of the rising section first increased and then decreased with the immersion time. There was a good correlation between the elastic modulus and the compressive strength during the immersion process. Based on the compound power exponential nonlinear model, and by taking into account the factors of long-term immersion, the relationship between the parameters of the model and the immersion age D(D≥14 d) was established, which provides a new method for the study of the stress-strain curve of red mud-coal metakaolin geopolymer under long-term corrosion by sulfuric acid.https://tyutjournal.tyut.edu.cn/englishpaper/show-335.htmlred mud-coal metakaolin geopolymersulfuric acid corrosionimmersiondurabilitycomposite power exponent model |
| spellingShingle | Liming GAO Tao WU Tiantian GUO Bin HE Fuli MA Xiaohong BAI Durability of Red Mud-Coal Metakaolin Geopolymer in Long-term Sulfuric Acid Corrosion Environment Taiyuan Ligong Daxue xuebao red mud-coal metakaolin geopolymer sulfuric acid corrosion immersion durability composite power exponent model |
| title | Durability of Red Mud-Coal Metakaolin Geopolymer in Long-term Sulfuric Acid Corrosion Environment |
| title_full | Durability of Red Mud-Coal Metakaolin Geopolymer in Long-term Sulfuric Acid Corrosion Environment |
| title_fullStr | Durability of Red Mud-Coal Metakaolin Geopolymer in Long-term Sulfuric Acid Corrosion Environment |
| title_full_unstemmed | Durability of Red Mud-Coal Metakaolin Geopolymer in Long-term Sulfuric Acid Corrosion Environment |
| title_short | Durability of Red Mud-Coal Metakaolin Geopolymer in Long-term Sulfuric Acid Corrosion Environment |
| title_sort | durability of red mud coal metakaolin geopolymer in long term sulfuric acid corrosion environment |
| topic | red mud-coal metakaolin geopolymer sulfuric acid corrosion immersion durability composite power exponent model |
| url | https://tyutjournal.tyut.edu.cn/englishpaper/show-335.html |
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