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Effects of temperatures and pH values on rheological properties of cemented paste backfill

温度和pH 值对全尾砂膏体流变特性的影响

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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.

摘要

本文研究了在不同温度和pH 值条件下, 温度和pH 值对全尾砂膏体流变特性的影响及其影响机制。在不同温度和pH 值的条件下制备全尾砂膏体, 温度控制分别设置在10, 20, 30, 40 和50 °C, pH 值控制分别设置为3, 7 和13。对制备完成的全尾砂膏体进行流变剪切试验, 热重实验(TG&DTG), 傅立叶变换红外光谱实验(FT-IR)和扫描电子显微镜分析(SEM)。研究结果表明, 温度对尾砂膏体的流变特性有显著影响, 而pH 值对全尾砂膏体的流变特性的影响相对较小。在相同的pH值条件下, 较高温度(超过20 °C)的全尾砂膏体易产生较高的剪切应力, 屈服应力和表观黏度, 但过高的温度(50 °C)无法达到更高的表观黏度。在同一温度, pH 值为3 和13 时的非中性环境下, 全尾砂膏体的剪切应力和表观黏度较中性条件都有所增强。相同温度下(低于50 °C), pH 值的升高会导致全尾砂膏体产生两种不同的屈服应力和表观黏度曲线。微观分析表明, 全尾砂膏体的流变特性受温度和pH值的影响, 温度和pH 值会影响全尾砂膏体中水泥的水化过程, 水化速率及水化产物的空间结构。

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Qin-li Zhang  (张钦礼), Yi-teng Li  (李奕腾), Qiu-song Chen  (陈秋松), Yan Feng  (冯岩) & Dao-lin Wang  (王道林)

  2. Sinosteel Maanshan Institute of Mining Research Company Limited, Maanshan, 243000, China

    Qiu-song Chen  (陈秋松)

  3. Department of Geoscience, University of Padova, Via Gradenigo 6, I-35131, Padova, Italy

    Yi-kai Liu  (刘一锴)

Authors
  1. Qin-li Zhang  (张钦礼)
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  2. Yi-teng Li  (李奕腾)
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  3. Qiu-song Chen  (陈秋松)
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  4. Yi-kai Liu  (刘一锴)
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  5. Yan Feng  (冯岩)
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  6. Dao-lin Wang  (王道林)
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Corresponding author

Correspondence to Qiu-song Chen  (陈秋松).

Additional information

Foundation item

Project(2019zzts678) supported by the Fundamental Research Funds for the Central Universities, China

Contributors

ZHANG Qin-li and CHEN Qiu-song provided the concept. LI Yi-teng wrote the first draft of the manuscript. FENG Yan provided the analysis methods. LIU Yi-kai and WANG Dao-lin edited the draft of manuscript. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

ZHANG Qin-li, LI Yi-teng, CHEN Qiu-song, LIU Yi-kai, FENG Yan and WANG Dao-lin declare that they have no conflict of interest.

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Zhang, Ql., Li, Yt., Chen, Qs. et al. Effects of temperatures and pH values on rheological properties of cemented paste backfill. J. Cent. South Univ. 28, 1707–1723 (2021). https://doi.org/10.1007/s11771-021-4728-4

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  • DOI: https://doi.org/10.1007/s11771-021-4728-4

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