Study on the Rheological Properties of High Calcium Desulfurization Ash–Slag-Based Paste Backfill Material
The environmental hazards caused by the massive generation and improper disposal of industrial solid wastes (e.g., high calcium desulphurization ash, HCDA) and the growing safety risks posed by the increasing number of underground mine goafs generated by mining activities have become serious environ...
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MDPI AG
2025-05-01
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| author | Weigao Ling Jun Chen Wenbo Ma |
| author_facet | Weigao Ling Jun Chen Wenbo Ma |
| author_sort | Weigao Ling |
| collection | DOAJ |
| description | The environmental hazards caused by the massive generation and improper disposal of industrial solid wastes (e.g., high calcium desulphurization ash, HCDA) and the growing safety risks posed by the increasing number of underground mine goafs generated by mining activities have become serious environmental and geotechnical challenges. To address the dual issues, this study develops a novel desulfurization ash–slag-based paste backfill (DSPB) material using HCDA and granulated blast furnace slag (GBFS) as primary constituents. The effects of cementitious material ratios, polycarboxylate superplasticizer (PCE), and sodium silicate (SS) on rheological properties of DSPB were investigated through a shear rheology experiment and fitting rheological model to assess the flow conditions in pipeline transportation. In addition, the mechanism was investigated through microanalysis. The results showed that with the decrease in desulfurization ash-to-slag ratio, the initial yield stress and plastic viscosity decreased by up to 88% and 34.9%, respectively; PCE via “card house” structural effects made the rheological parameters increase and then decrease, and a dosage of more than 1.2% significantly improved the rheological properties; and SS initially reduced the rheological parameters, but excessive doping (greater than 1.0%) led to an increase. These findings establish the relationship between DSPB composition and rheological properties, provide a practical solution for waste resource utilization and surface stabilization, and provide a scientific basis for the microstructure–rheology relationship of cementitious systems. |
| format | Article |
| id | doaj-art-8ae9a7764c8143ea964832eb0870c95f |
| institution | DOAJ |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
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| spelling | doaj-art-8ae9a7764c8143ea964832eb0870c95f2025-08-20T02:59:11ZengMDPI AGApplied Sciences2076-34172025-05-01159510510.3390/app15095105Study on the Rheological Properties of High Calcium Desulfurization Ash–Slag-Based Paste Backfill MaterialWeigao Ling0Jun Chen1Wenbo Ma2College of Civil Engineering, Xiangtan University, Xiangtan 411105, ChinaCollege of Civil Engineering, Xiangtan University, Xiangtan 411105, ChinaCollege of Civil Engineering, Xiangtan University, Xiangtan 411105, ChinaThe environmental hazards caused by the massive generation and improper disposal of industrial solid wastes (e.g., high calcium desulphurization ash, HCDA) and the growing safety risks posed by the increasing number of underground mine goafs generated by mining activities have become serious environmental and geotechnical challenges. To address the dual issues, this study develops a novel desulfurization ash–slag-based paste backfill (DSPB) material using HCDA and granulated blast furnace slag (GBFS) as primary constituents. The effects of cementitious material ratios, polycarboxylate superplasticizer (PCE), and sodium silicate (SS) on rheological properties of DSPB were investigated through a shear rheology experiment and fitting rheological model to assess the flow conditions in pipeline transportation. In addition, the mechanism was investigated through microanalysis. The results showed that with the decrease in desulfurization ash-to-slag ratio, the initial yield stress and plastic viscosity decreased by up to 88% and 34.9%, respectively; PCE via “card house” structural effects made the rheological parameters increase and then decrease, and a dosage of more than 1.2% significantly improved the rheological properties; and SS initially reduced the rheological parameters, but excessive doping (greater than 1.0%) led to an increase. These findings establish the relationship between DSPB composition and rheological properties, provide a practical solution for waste resource utilization and surface stabilization, and provide a scientific basis for the microstructure–rheology relationship of cementitious systems.https://www.mdpi.com/2076-3417/15/9/5105high calcium desulfurization ashpaste backfillrheological propertiesyield stressplastic viscosityfluidity |
| spellingShingle | Weigao Ling Jun Chen Wenbo Ma Study on the Rheological Properties of High Calcium Desulfurization Ash–Slag-Based Paste Backfill Material Applied Sciences high calcium desulfurization ash paste backfill rheological properties yield stress plastic viscosity fluidity |
| title | Study on the Rheological Properties of High Calcium Desulfurization Ash–Slag-Based Paste Backfill Material |
| title_full | Study on the Rheological Properties of High Calcium Desulfurization Ash–Slag-Based Paste Backfill Material |
| title_fullStr | Study on the Rheological Properties of High Calcium Desulfurization Ash–Slag-Based Paste Backfill Material |
| title_full_unstemmed | Study on the Rheological Properties of High Calcium Desulfurization Ash–Slag-Based Paste Backfill Material |
| title_short | Study on the Rheological Properties of High Calcium Desulfurization Ash–Slag-Based Paste Backfill Material |
| title_sort | study on the rheological properties of high calcium desulfurization ash slag based paste backfill material |
| topic | high calcium desulfurization ash paste backfill rheological properties yield stress plastic viscosity fluidity |
| url | https://www.mdpi.com/2076-3417/15/9/5105 |
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