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中南大学学报(英文版)

Journal of Central South University

Vol. 28    No. 6    June 2021

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Effects of temperatures and pH values on rheological properties of cemented paste backfill
ZHANG Qin-li(张钦礼)1, LI Yi-teng(李奕腾)1, CHEN Qiu-song(陈秋松)1, 2, LIU Yi-kai(刘一锴)3, FENG Yan(冯岩)1, WANG Dao-lin(王道林)1

1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. Sinosteel Maanshan Institute of Mining Research Company Limited, Maanshan 243000, China;
3. Department of Geoscience, University of Padova, Via Gradenigo 6, I-35131 Padova, Italy

Abstract:In this study, different influence mechanisms associated with temperatures and pH values were investigated through cemented paste backfill (CPB) systems. CPB samples were prepared with temperatures ranging from 10 to 50 °C in 10 °C increments and pH values of 3, 7, and 13. Then, the CPB mixture were subjected to rheological tests, thermogravimetric analysis (TG), derivative thermogravimetry analysis (DTG), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). Results demonstrated that the temperatures had significant effects on the rheological properties of CPB, whereas the effects of pH values were relatively unapparent. Higher temperatures (over 20 °C) were prone to bring higher shear stress, yield stress, and apparent viscosity with the same pH value condition. However, an overly high temperature (50 °C) cannot raise the apparent viscosity. Non-neutral conditions, for pH values of 3 and 13, could strengthen the shear stress and apparent viscosity at the same temperature. Two different yield stress curves could be discovered by uprising pH values, which also led to apparent viscosity of two various curves under the same temperatures (under 50 °C). Microscopically, rheological properties of CPB were affected by temperatures and pH values which enhanced or reduced the cement hydration procedures, rates, products and space structures.

 

Key words: cemented paste backfill (CPB); rheological properties; temperatures; pH values; cement hydration; microscopic analysis

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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