Evaluation of static segregation of cemented gangue-fly ash backfill material using electrical resistivity method. (15th March 2020)

• Record Type: Journal Article
• Authors: Wang, Zehua; Feng, Guorui; Qi, Tingye; Guo, Yuxia; Du, Xianjie
• Is Part Of: Measurement. Volume 154(2020)
• Publication Date: 2020-03-15
• Subjects: Cemented gangue-fly ash backfill material -- Static segregation -- Electrical resistivity method -- Bleeding -- Image analysis; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2020.107483
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: The static stability of a CGFBM is evaluated by the ER variations. The CGFBM with a SI larger than 0.85 can be considered to have a high stability. The ER method correlates well with the bleeding test and image analysis method. Abstract: Static segregation of a cemented gangue-fly ash backfill material (CGFBM) presents a harmful impact on its mechanical and pipeline transportation performances. To evaluate the static segregation of a CGFBM in real time, electrical resistivity (ER) method is proposed by monitoring the ER change at different depths. The static stabilities of various mixtures with different mass concentrations of 74%, 76%, 78%, 80%, and 82% are evaluated in terms of the ER characteristics and derived segregation index (SI). Results showed that: for mixtures with relatively low mass concentrations (74% and 76%), the SI gradually decreases with increasing elapsed time after casting. 0.85 is the critical value. The CGFBM with a SI smaller and larger than 0.85 can be considered to have a low and high stability, respectively. The feasibility of the ER method is verified by bleeding test and image analysis method.