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      Using Coupled Rheometer-FBRM to Study Rheological Properties and Microstructure of Cemented Paste Backfill

      1 , 1 , 2 , 1 , 1 , 1
      Advances in Materials Science and Engineering
      Hindawi Limited

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          Abstract

          Rheological properties, such as the yield stress, viscosity, and thixotropy, are related to the microstructure of cemented paste backfill (CPB). To highlight the relationship, two instruments were combined to measure the changes in the microstructure and the rheological properties of CPB simultaneously. In this way, the particle/agglomerate size distribution characterized by the focused beam reflectance measurement (FBRM) and the rheological factors measured by the rheometers could be directly linked. The results show that when under shearing, the intrinsic network structure of CPB responds to the shear-induced stresses with the interference of interparticle forces, leading to changes in the rheological behavior. Shear thinning can be found in CPB suspensions with a microstructure that is either loose interconnection or random. With an increase in the shear rate, random collisions among particles become organized in the flow, lowering the yield stress and viscosity. However, when the shear rate exceeds a certain threshold value, the rheological parameters change as a result of shear thickening. The results of this study contribute to better understanding of the complex rheological behavior of CPB.

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          Most cited references49

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          Shear thickening in colloidal dispersions

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            A contribution to understanding the effects of curing temperature on the mechanical properties of mine cemented tailings backfill

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              Design and Application of Underground Mine Paste Backfill Technology

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                Author and article information

                Journal
                Advances in Materials Science and Engineering
                Advances in Materials Science and Engineering
                Hindawi Limited
                1687-8434
                1687-8442
                July 01 2019
                July 01 2019
                : 2019
                : 1-10
                Affiliations
                [1 ]School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
                [2 ]State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
                Article
                10.1155/2019/6813929
                855ca1c3-eaed-408f-a4a9-d1f45b71d326
                © 2019

                http://creativecommons.org/licenses/by/4.0/

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