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The Mechanism of Viscosity-Enhancing Admixture in Backfill Slurry and the Evolution of Its Rheological Properties

Minerals (Basel), 2023-08, Vol.13 (8), p.1045 [Peer Reviewed Journal]

COPYRIGHT 2023 MDPI AG ;2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 2075-163X ;EISSN: 2075-163X ;DOI: 10.3390/min13081045

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  • Title:
    The Mechanism of Viscosity-Enhancing Admixture in Backfill Slurry and the Evolution of Its Rheological Properties
  • Author: Yang, Liuhua ; Jia, Hengwei ; Jiao, Huazhe ; Dong, Mengmeng ; Yang, Tongyi
  • Subjects: Aggregation ; Bleeding ; bleeding rate ; Cellulose ; Cement ; Compressive strength ; Dosage ; Evolution ; Experiments ; hydroxypropyl methylcellulose (HPMC) ; Liquidity ; Mechanical properties ; Mining ; Particle size ; paste slurry ; Performance testing ; Performance tests ; Resource recovery ; Retention ; rheological performance ; Rheological properties ; Rheology ; Rubber ; Sediments ; Slurries ; Stability analysis ; Stress concentration ; Viscosity ; Wear ; Wear resistance ; xanthan gum (XG) ; Yield strength ; Yield stress
  • Is Part Of: Minerals (Basel), 2023-08, Vol.13 (8), p.1045
  • Description: Since filling slurry is a cement-based material, viscosity-enhancing admixture exerts a significant effect on its rheological performance and mechanical properties. Viscosity-enhancing admixture can improve pipeline transportation performance and reduce pipeline wear during the filling process of a kilometer-deep mine by changing the plastic viscosity and yield stress of high-concentration filling slurries. In order to reveal the influence mechanism of viscosity-enhancing admixture on rheological performance in slurry, the influence of viscosity-enhancing admixture on the rheological performance of slurry is explored by adjusting viscosity-enhancing admixture dosage and conducting bleeding test, liquidity test, and rheological performance test. The extended DLVO theory is employed to analyze the mechanism of HPMC on the stability of filling slurry. The results show that compared with ordinary slurry, after adding HPMC and XG, the particles of filling slurry are prone to link to form a mesh structure. Besides, the increasing frictional force between particles results in a significant decrease in the bleeding rate and liquidity of the slurry. Such an effect becomes more obvious with the increase of viscosity-enhancing admixture dosage. Meanwhile, the overall effect of HPMC molecules is better than that of XG molecules since HPMC can reduce inter-particle repulsion and facilitate particle aggregation. The optimal dosage is about 0.1%, at which time the yield stress of the filling slurry increases from 89.236 to 160.06 Pa, the plastic viscosity increases from 0.296 to 1.063 Pa·s, and the compressive strength increases from 2.58 to 3.59 MPa in 28 days. The study reveals the influence of viscosity-enhancing admixture on the rheological performance of filling slurry and its evolution characteristics, which provides theoretical support for the development of filling resistance and wear reduction technology.
  • Publisher: Basel: MDPI AG
  • Language: English
  • Identifier: ISSN: 2075-163X
    EISSN: 2075-163X
    DOI: 10.3390/min13081045
  • Source: Alma/SFX Local Collection
    ROAD: Directory of Open Access Scholarly Resources
    ProQuest Central
    DOAJ Directory of Open Access Journals
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