期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 317, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.125863
关键词
Tailings management; Superabsorbent polymer (SAP); SAP-thickened tailings; Cemented paste backfill (CPB); SAP water desorption; Rheology; Yield stress; Infinite viscosity
资金
- FRQNT partnership program on Sustainable Development in the Mining Sector [2017-MI202211]
- NSERC Discovery Grant [RGPIN-2019-04946]
The addition of superabsorbent polymers (SAP) to cemented paste backfill (CPB) made from tailings slurries can improve the rheological behavior and water absorption capacity. Results show that SAP addition reduces the yield stress and viscosity, and increases the slump height of the CPB mixtures. Moreover, the SAP-thickened CPB exhibits a distinct shear-thinning behavior, while the reference CPB without SAP exhibits a normal shear-thinning behavior.
The addition of superabsorbent polymers (SAP) to cemented paste backfill (CPB) made from tailings slurries may offer a good alternative to the dewatering components of the conventional CPB production owing to their highwater absorption and retention capacities. Therefore, an experimental program was implemented to characterize the rheological behavior of CPB incorporating an SAP. Two types of binder comprising a general use Portland cement (GU) and a blended binder (GUSL) consisting of 80% ground granulated blast furnace slag (GGBFS) and 20% GU were used. Two different binder proportions, B-w (=100 x M-binder/Mdry-tailings) of 4.5 and 7% were tested. An SAP dosage (ratio of the dry mass of SAP to the volume of the tailings slurry) of 30 and 34 kg/m(3) was assessed in this study. Results showed that the SAP addition distinctly reduced the yield stress (tau(0)) and the infinite shear viscosity (mu proportional to) and increased the small cone (H = 150 mm) slump height (s) of such mixtures over time. Moreover, The SAP-thickened tailings CPB (SAP-TT CPB) showed a severe shear-thinning behavior marked by a negative flow index (n < 0) and moderate to extremely low yield stress (tau(0) in the range 21-78 Pa), while the corresponding reference CPB without SAP added (Ref) exhibited a normal shear-thinning behavior with moderate to slightly high yield stress (tau(0) in the range 76-206 Pa).
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