Improving the performance of superfine-tailings cemented paste backfill with a new blended binder

To improve the performance of the superfine-tailings cemented paste backfill (SCPB) and thus improve the utilization rate of superfine tailings, a blended binder (BB, containing high-volume mineral admixtures) and superplasticizer (SP) were employed. BB was designed based on the proposed model that...

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Bibliographic Details
Published in:Powder technology 2021-12, Vol.394, p.149-160
Main Authors: Guo, Zhenbang, Qiu, Jingping, Jiang, Haiqiang, Zhang, Shiyu, Ding, Hangxing
Format: Article
Language:English
Subjects:
Admixtures
Backfill
Compressibility
Compressive strength
Coupling
Film thickness
Fluidity
Green binder
Mine tailings
Packing
Packing density
Performance enhancement
Superfine-tailings cemented paste backfill
Superplasticizer
Superplasticizers
Tailings
Ultrafines
Viscosity
Water film
Water film thickness
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Summary:To improve the performance of the superfine-tailings cemented paste backfill (SCPB) and thus improve the utilization rate of superfine tailings, a blended binder (BB, containing high-volume mineral admixtures) and superplasticizer (SP) were employed. BB was designed based on the proposed model that coupled wet packing method and compressible packing model (CPM). The fluidity, the mechanical and microstructure properties of SCPB with various dosages of BB and SP were evaluated. Moreover, the coupling mechanism of BB and SP on the fluidity of fresh SCPB was also discussed. The results showed that the proposed coupling model could accurately predict the packing density of the multi-mixed cementitious system. The addition of BB and SP can improve the fluidity and strength of SCPB, and the coupling mechanism that affects the fluidity mainly by changing water film thickness (WFT). Therefore, using BB and SP is an effective method for improving the performance of SCPB. [Display omitted] •A blended binder (BB) containing high-volume mineral admixtures was designed.•BB and SP influence SCPB flowability through changing WFT.•Using BB and SP is an effective method for improving the performance of SCPB.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2021.08.029