Investigation of magnesium phosphate cement on river dredged sludge with varying humic acid content and solidification mechanism
This paper investigated the use of magnesium phosphate cement (MPC) for solidifying sludge with different humic acid (HA) content (ranging from 0 to 4.5%) and explored the solidification mechanism. Fluidity, setting time, unconfined compressive strength (UCS), the strength formation mechanism, and t...
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Elsevier
2025-01-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775524002968 |
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| author | Xiaoyi Yuan Lei Peng Bing Chen |
| author_facet | Xiaoyi Yuan Lei Peng Bing Chen |
| author_sort | Xiaoyi Yuan |
| collection | DOAJ |
| description | This paper investigated the use of magnesium phosphate cement (MPC) for solidifying sludge with different humic acid (HA) content (ranging from 0 to 4.5%) and explored the solidification mechanism. Fluidity, setting time, unconfined compressive strength (UCS), the strength formation mechanism, and the spontaneous imbibition process of solidified sludge (SS) were studied. The results indicate that MPC can be used as a low-alkalinity curing agent. As the HA content increases, fluidity and setting time also increase, while hydration temperature and strength decrease. Additionally, the failure mode of SS transitions from brittleness to ductility. The strength of SS is composed of the cementation strength provided by MPC hydration products, matric suction, osmotic suction, and the structural strength of the sludge. MPC reduces the structural strength caused by the shrinkage of pure sludge under the action of matric suction, but the incorporation of MPC significantly improved the strength when the sludge is eroded by water. X-ray diffraction (XRD) and scanning electron microscopy (SEM) show that the sludge and MPC can form a dense solid body, forming various hydration products, and synergistically improve the mechanical properties of the sludge. |
| format | Article |
| id | doaj-art-b54207e2af4a44b795a03febcae5c0b0 |
| institution | Kabale University |
| issn | 1674-7755 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj-art-b54207e2af4a44b795a03febcae5c0b02025-01-17T04:49:11ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552025-01-01171573585Investigation of magnesium phosphate cement on river dredged sludge with varying humic acid content and solidification mechanismXiaoyi Yuan0Lei Peng1Bing Chen2Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, ChinaDepartment of Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, ChinaDepartment of Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Corresponding author. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.This paper investigated the use of magnesium phosphate cement (MPC) for solidifying sludge with different humic acid (HA) content (ranging from 0 to 4.5%) and explored the solidification mechanism. Fluidity, setting time, unconfined compressive strength (UCS), the strength formation mechanism, and the spontaneous imbibition process of solidified sludge (SS) were studied. The results indicate that MPC can be used as a low-alkalinity curing agent. As the HA content increases, fluidity and setting time also increase, while hydration temperature and strength decrease. Additionally, the failure mode of SS transitions from brittleness to ductility. The strength of SS is composed of the cementation strength provided by MPC hydration products, matric suction, osmotic suction, and the structural strength of the sludge. MPC reduces the structural strength caused by the shrinkage of pure sludge under the action of matric suction, but the incorporation of MPC significantly improved the strength when the sludge is eroded by water. X-ray diffraction (XRD) and scanning electron microscopy (SEM) show that the sludge and MPC can form a dense solid body, forming various hydration products, and synergistically improve the mechanical properties of the sludge.http://www.sciencedirect.com/science/article/pii/S1674775524002968Sludge solidificationMPCUnsaturated spontaneous imbibitionStrength mechanismHumic acid |
| spellingShingle | Xiaoyi Yuan Lei Peng Bing Chen Investigation of magnesium phosphate cement on river dredged sludge with varying humic acid content and solidification mechanism Journal of Rock Mechanics and Geotechnical Engineering Sludge solidification MPC Unsaturated spontaneous imbibition Strength mechanism Humic acid |
| title | Investigation of magnesium phosphate cement on river dredged sludge with varying humic acid content and solidification mechanism |
| title_full | Investigation of magnesium phosphate cement on river dredged sludge with varying humic acid content and solidification mechanism |
| title_fullStr | Investigation of magnesium phosphate cement on river dredged sludge with varying humic acid content and solidification mechanism |
| title_full_unstemmed | Investigation of magnesium phosphate cement on river dredged sludge with varying humic acid content and solidification mechanism |
| title_short | Investigation of magnesium phosphate cement on river dredged sludge with varying humic acid content and solidification mechanism |
| title_sort | investigation of magnesium phosphate cement on river dredged sludge with varying humic acid content and solidification mechanism |
| topic | Sludge solidification MPC Unsaturated spontaneous imbibition Strength mechanism Humic acid |
| url | http://www.sciencedirect.com/science/article/pii/S1674775524002968 |
| work_keys_str_mv | AT xiaoyiyuan investigationofmagnesiumphosphatecementonriverdredgedsludgewithvaryinghumicacidcontentandsolidificationmechanism AT leipeng investigationofmagnesiumphosphatecementonriverdredgedsludgewithvaryinghumicacidcontentandsolidificationmechanism AT bingchen investigationofmagnesiumphosphatecementonriverdredgedsludgewithvaryinghumicacidcontentandsolidificationmechanism |