Compression behavior and microstructure mechanism of GGBS-stabilized dredged clay.
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| Title: | Compression behavior and microstructure mechanism of GGBS-stabilized dredged clay. |
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| Authors: | Zhu, Wei1 (AUTHOR), Feng, Zhenyan1 (AUTHOR), Miao, Yonghong1 (AUTHOR), Cheng, Ruoming1 (AUTHOR), Yin, Jie1 (AUTHOR) yinjie@ujs.edu.cn |
| Source: | Marine Georesources & Geotechnology. Nov2025, Vol. 43 Issue 11, p2340-2350. 11p. |
| Subjects: | Compressibility, Microstructure, Recycling management, Slag cement, Materials compression testing, Dredging spoil, Stabilizing agents, Diagenesis |
| Abstract: | This study investigates the effectiveness of ground granulated blast-furnace slag (GGBS) in improving the compressibility of dredged clay, addressing the pressing need for sustainable dredged material recycling. A series of one-dimensional compression tests were conducted on dredged clay samples treated with varying GGBS contents (0%, 10%, 20%, and 30%) and curing times (3 h, 7 d, and 28 d). Results showed a significant reduction in the compression coefficient, ranging from 0.04 to 0.35 MPa−1 for treated samples, compared to 0.70 MPa−1 for untreated clay. Increasing the GGBS content or extending the curing time further reduces the compressibility of the dredged clay. The compression indices in both pre- and post-yield stages, as well as the swelling index during unloading, decrease linearly with higher GGBS content and decrease nonlinearly with longer curing times. Specifically, these indices and the swelling index decrease rapidly from 3 h to 7 d of curing, then level off from 7 d to 28 d. The compression yield stress increases with curing time and GGBS content, showing lower compressibility before yielding and a marked increase in compressibility after yielding. Microstructural analysis via SEM revealed a transition from a porous to a cohesive structure, facilitated by hydration and pozzolanic reactions forming cementitious products, such as C-S-H and C-A-S-H. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | This study investigates the effectiveness of ground granulated blast-furnace slag (GGBS) in improving the compressibility of dredged clay, addressing the pressing need for sustainable dredged material recycling. A series of one-dimensional compression tests were conducted on dredged clay samples treated with varying GGBS contents (0%, 10%, 20%, and 30%) and curing times (3 h, 7 d, and 28 d). Results showed a significant reduction in the compression coefficient, ranging from 0.04 to 0.35 MPa−1 for treated samples, compared to 0.70 MPa−1 for untreated clay. Increasing the GGBS content or extending the curing time further reduces the compressibility of the dredged clay. The compression indices in both pre- and post-yield stages, as well as the swelling index during unloading, decrease linearly with higher GGBS content and decrease nonlinearly with longer curing times. Specifically, these indices and the swelling index decrease rapidly from 3 h to 7 d of curing, then level off from 7 d to 28 d. The compression yield stress increases with curing time and GGBS content, showing lower compressibility before yielding and a marked increase in compressibility after yielding. Microstructural analysis via SEM revealed a transition from a porous to a cohesive structure, facilitated by hydration and pozzolanic reactions forming cementitious products, such as C-S-H and C-A-S-H. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 1064119X |
| DOI: | 10.1080/1064119X.2025.2457116 |
