Preparation and properties of alkali-activated slag-like powder paste
To address the challenges of transporting cementitious materials during the construction of islands and reefs in remote seas, local materials like sea sand and calcium carbonate-rich coral reefs were considered for preparing slag-like powder (SP), and alkali-activated slag-like powder paste (AASPP)...
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425000365 |
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| author | Donghui Li Wenzhong Zheng Ying Wang |
| author_facet | Donghui Li Wenzhong Zheng Ying Wang |
| author_sort | Donghui Li |
| collection | DOAJ |
| description | To address the challenges of transporting cementitious materials during the construction of islands and reefs in remote seas, local materials like sea sand and calcium carbonate-rich coral reefs were considered for preparing slag-like powder (SP), and alkali-activated slag-like powder paste (AASPP) was obtained by activating SP with alkaline activators. This study used sea sand and ground calcium carbonate powder as raw materials to prepare five types of SP with different Ca/Si (C/S) ratios by melting, water quenching, and grinding. Liquid sodium silicate (LSS) served as the activator for SP in preparing AASPP with fluidity ranging from 144 to 200 mm, final setting time from 48 to 2272 min, and compressive strength at 28 days reaching up to 135.72 MPa, achieving the strength level of alkali-activated slag paste (AASP). The effects of the silicate modulus (Ms) and Na2O content (Nc) in LSS, and the C/S ratio in SP on the fluidity, setting time, and strength development of the AASPP were also explored. Additionally, a series of analytical techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electronic microscopy with energy dispersive spectroscopy (SEM-EDS), were used to explain the underlying reasons for the differences in macroscopic properties from a microscopic perspective. Finally, a Ms of 1.8 and a Nc of 8% were selected as the optimal mix proportion of the LSS-activated SP paste. |
| format | Article |
| id | doaj-art-9528cbe5ac4c4dc4a9de79513a7aee24 |
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| language | English |
| publishDate | 2025-03-01 |
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| spelling | doaj-art-9528cbe5ac4c4dc4a9de79513a7aee242025-08-20T02:59:24ZengElsevierJournal of Materials Research and Technology2238-78542025-03-013561162710.1016/j.jmrt.2025.01.036Preparation and properties of alkali-activated slag-like powder pasteDonghui Li0Wenzhong Zheng1Ying Wang2School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China; Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education, Harbin Institute of Technology, Harbin, 150090, China; Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin, 150090, ChinaSchool of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China; Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education, Harbin Institute of Technology, Harbin, 150090, China; Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin, 150090, China; Corresponding author. School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China.School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China; Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education, Harbin Institute of Technology, Harbin, 150090, China; Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin, 150090, ChinaTo address the challenges of transporting cementitious materials during the construction of islands and reefs in remote seas, local materials like sea sand and calcium carbonate-rich coral reefs were considered for preparing slag-like powder (SP), and alkali-activated slag-like powder paste (AASPP) was obtained by activating SP with alkaline activators. This study used sea sand and ground calcium carbonate powder as raw materials to prepare five types of SP with different Ca/Si (C/S) ratios by melting, water quenching, and grinding. Liquid sodium silicate (LSS) served as the activator for SP in preparing AASPP with fluidity ranging from 144 to 200 mm, final setting time from 48 to 2272 min, and compressive strength at 28 days reaching up to 135.72 MPa, achieving the strength level of alkali-activated slag paste (AASP). The effects of the silicate modulus (Ms) and Na2O content (Nc) in LSS, and the C/S ratio in SP on the fluidity, setting time, and strength development of the AASPP were also explored. Additionally, a series of analytical techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electronic microscopy with energy dispersive spectroscopy (SEM-EDS), were used to explain the underlying reasons for the differences in macroscopic properties from a microscopic perspective. Finally, a Ms of 1.8 and a Nc of 8% were selected as the optimal mix proportion of the LSS-activated SP paste.http://www.sciencedirect.com/science/article/pii/S2238785425000365Slag-like powder (SP)Alkali-activated slag-like powder paste (AASPP)WorkabilityCompressive strengthMicroscopic analyses |
| spellingShingle | Donghui Li Wenzhong Zheng Ying Wang Preparation and properties of alkali-activated slag-like powder paste Journal of Materials Research and Technology Slag-like powder (SP) Alkali-activated slag-like powder paste (AASPP) Workability Compressive strength Microscopic analyses |
| title | Preparation and properties of alkali-activated slag-like powder paste |
| title_full | Preparation and properties of alkali-activated slag-like powder paste |
| title_fullStr | Preparation and properties of alkali-activated slag-like powder paste |
| title_full_unstemmed | Preparation and properties of alkali-activated slag-like powder paste |
| title_short | Preparation and properties of alkali-activated slag-like powder paste |
| title_sort | preparation and properties of alkali activated slag like powder paste |
| topic | Slag-like powder (SP) Alkali-activated slag-like powder paste (AASPP) Workability Compressive strength Microscopic analyses |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425000365 |
| work_keys_str_mv | AT donghuili preparationandpropertiesofalkaliactivatedslaglikepowderpaste AT wenzhongzheng preparationandpropertiesofalkaliactivatedslaglikepowderpaste AT yingwang preparationandpropertiesofalkaliactivatedslaglikepowderpaste |