Effects of desulfurized gypsum on shrinkage behavior of alkali-activated slag (AAS) and hybrid alkali-activated cement (HAC)
This study reports the use of desulfurized gypsum (DSG) to mitigate the shrinkage problem of two typical alkali-activated materials (AAMs), i.e. alkali-activated slag (AAS) and hybrid alkali-activated cement (HAC). The effects of DSG type and content on the hydration kinetics, mechanical properties,...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525001184 |
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| author | Lili Xue Zhenkun Ni Zhengning Zhou Zuhua Zhang Houren Xiong Hao Wang Xifeng Zhuge Hongfei Liu |
| author_facet | Lili Xue Zhenkun Ni Zhengning Zhou Zuhua Zhang Houren Xiong Hao Wang Xifeng Zhuge Hongfei Liu |
| author_sort | Lili Xue |
| collection | DOAJ |
| description | This study reports the use of desulfurized gypsum (DSG) to mitigate the shrinkage problem of two typical alkali-activated materials (AAMs), i.e. alkali-activated slag (AAS) and hybrid alkali-activated cement (HAC). The effects of DSG type and content on the hydration kinetics, mechanical properties, autogenous/drying shrinkage, and microstructure evolution of the AAMs were investigated. Results indicate that DSG can retard the hydration process and reduce the formation of gel products. Incorporating DSG into AAM mortar leads to a reduction in both autogenous and drying shrinkage, showing better efficiency than normal gypsum. An insights into the mechanisms underlying shrinkage for the DSG-AAM systems was gained through MIP, 1H NMR,XRD,TG-DTG, and SEM-EDS analyses. It was discovered that the higher Ca/Si of gel (amorphous C-A-S-H) phase and the higher crystalline/gel phases ratio in the DSG-AAM systems contributed to mitigating drying shrinkage. In addition, the shift of gel pore and capillary pore size and distribution contribute the reduced shrinkage. |
| format | Article |
| id | doaj-art-74f0d887c39449de94852103c1d04e99 |
| institution | Kabale University |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-74f0d887c39449de94852103c1d04e992025-02-03T04:16:44ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e04320Effects of desulfurized gypsum on shrinkage behavior of alkali-activated slag (AAS) and hybrid alkali-activated cement (HAC)Lili Xue0Zhenkun Ni1Zhengning Zhou2Zuhua Zhang3Houren Xiong4Hao Wang5Xifeng Zhuge6Hongfei Liu7College of Civil Engineering and Architecture, Jiaxing University, Jiaxing, Zhejiang 314001, China; Corresponding authors.College of Civil Engineering and Architecture, Jiaxing University, Jiaxing, Zhejiang 314001, ChinaKey Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 201804, ChinaKey Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China; Corresponding authors.College of Civil Engineering and Architecture, Jiaxing University, Jiaxing, Zhejiang 314001, ChinaCentre for Future Materials, University of Southern Queensland, Toowoomba, Queensland 4350, AustraliaBeijing Poly New Materials Co.Ltd., Building 1 of Lanbao International, No. 3 Xidawang Road, Chaoyang District, Beijing 100026, ChinaCollege of Civil Engineering and Architecture, Jiaxing University, Jiaxing, Zhejiang 314001, ChinaThis study reports the use of desulfurized gypsum (DSG) to mitigate the shrinkage problem of two typical alkali-activated materials (AAMs), i.e. alkali-activated slag (AAS) and hybrid alkali-activated cement (HAC). The effects of DSG type and content on the hydration kinetics, mechanical properties, autogenous/drying shrinkage, and microstructure evolution of the AAMs were investigated. Results indicate that DSG can retard the hydration process and reduce the formation of gel products. Incorporating DSG into AAM mortar leads to a reduction in both autogenous and drying shrinkage, showing better efficiency than normal gypsum. An insights into the mechanisms underlying shrinkage for the DSG-AAM systems was gained through MIP, 1H NMR,XRD,TG-DTG, and SEM-EDS analyses. It was discovered that the higher Ca/Si of gel (amorphous C-A-S-H) phase and the higher crystalline/gel phases ratio in the DSG-AAM systems contributed to mitigating drying shrinkage. In addition, the shift of gel pore and capillary pore size and distribution contribute the reduced shrinkage.http://www.sciencedirect.com/science/article/pii/S2214509525001184ShrinkageDesulfurized gypsumAlkali-activated materialsHydrationMicrostructure |
| spellingShingle | Lili Xue Zhenkun Ni Zhengning Zhou Zuhua Zhang Houren Xiong Hao Wang Xifeng Zhuge Hongfei Liu Effects of desulfurized gypsum on shrinkage behavior of alkali-activated slag (AAS) and hybrid alkali-activated cement (HAC) Case Studies in Construction Materials Shrinkage Desulfurized gypsum Alkali-activated materials Hydration Microstructure |
| title | Effects of desulfurized gypsum on shrinkage behavior of alkali-activated slag (AAS) and hybrid alkali-activated cement (HAC) |
| title_full | Effects of desulfurized gypsum on shrinkage behavior of alkali-activated slag (AAS) and hybrid alkali-activated cement (HAC) |
| title_fullStr | Effects of desulfurized gypsum on shrinkage behavior of alkali-activated slag (AAS) and hybrid alkali-activated cement (HAC) |
| title_full_unstemmed | Effects of desulfurized gypsum on shrinkage behavior of alkali-activated slag (AAS) and hybrid alkali-activated cement (HAC) |
| title_short | Effects of desulfurized gypsum on shrinkage behavior of alkali-activated slag (AAS) and hybrid alkali-activated cement (HAC) |
| title_sort | effects of desulfurized gypsum on shrinkage behavior of alkali activated slag aas and hybrid alkali activated cement hac |
| topic | Shrinkage Desulfurized gypsum Alkali-activated materials Hydration Microstructure |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525001184 |
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