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Formation of Friedel’s salt using steel slag and potash mine brine water
Highlights Flow and later strength properties of CPBs are both great in the system. Steel slag was proved to exhibit latent hydraulic behavior. The main hydration products in the system are C-S-H gels and Friedel’s salt. Impure ions can be fixed by layered structure of Friedel’s salt.
Abstract The increasing depth and widening scale of potash mines are suggestive of the use of mortars with greater homogeneity and fluidity properties for mine backfills. Results of the experimental investigations discussed herein indicated that the flow property and the later strength of mortars can both be satisfied through the utilization of steel slag (SS) as a binder in potash mines. Paste samples were evaluated in terms of the hydration mechanism for the mixture of brine water (liquid waste from potash mines) and SS, and were found to achieve a compressive strength of 10 and 15 MPa after 28 and 60 curing days, respectively. An analysis carried out for the microstructure of the pastes revealed C–S–H gels and Friedel’s salt being the main hydration products in the system, in which active interpenetration between the substances contributes to the enhancement of the paste’s strength. Impure ions in the system can be fixed to improve the stability of the filler through the formation of Friedel’s salt. Overall, the findings of the present study confirmed that SS exhibits a latent hydraulic behavior and can be used as a binder in mortars for long-distance transportation in potash mines.
Formation of Friedel’s salt using steel slag and potash mine brine water
Highlights Flow and later strength properties of CPBs are both great in the system. Steel slag was proved to exhibit latent hydraulic behavior. The main hydration products in the system are C-S-H gels and Friedel’s salt. Impure ions can be fixed by layered structure of Friedel’s salt.
Abstract The increasing depth and widening scale of potash mines are suggestive of the use of mortars with greater homogeneity and fluidity properties for mine backfills. Results of the experimental investigations discussed herein indicated that the flow property and the later strength of mortars can both be satisfied through the utilization of steel slag (SS) as a binder in potash mines. Paste samples were evaluated in terms of the hydration mechanism for the mixture of brine water (liquid waste from potash mines) and SS, and were found to achieve a compressive strength of 10 and 15 MPa after 28 and 60 curing days, respectively. An analysis carried out for the microstructure of the pastes revealed C–S–H gels and Friedel’s salt being the main hydration products in the system, in which active interpenetration between the substances contributes to the enhancement of the paste’s strength. Impure ions in the system can be fixed to improve the stability of the filler through the formation of Friedel’s salt. Overall, the findings of the present study confirmed that SS exhibits a latent hydraulic behavior and can be used as a binder in mortars for long-distance transportation in potash mines.
Formation of Friedel’s salt using steel slag and potash mine brine water
Wang, Xue (author) / Ni, Wen (author) / Jin, Rongzhen (author) / Liu, Bing (author)
Construction and Building Materials ; 220 ; 119-127
2019-05-31
9 pages
Article (Journal)
Electronic Resource
English
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