Scholarlink

<p>This study investigates the effects of calcination (650–800°C) and secondary grinding on the phase evolution and reactivity of coal gangue for potential use as a cement substitute. Thermogravimetric-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR) analyses revealed that calcination at 650&#xa0;°C decomposed kaolinite into amorphous aluminosilicate phases, increasing the specific surface area by 61.6% and enhancing Si/Al dissolution rates. Secondary grinding further improved reactivity, achieving a 28-day compressive strength of 51.2 MPa for mortar containing 30% calcined gangue, surpassing pure cement systems. The optimized process demonstrates that thermally activated and finely ground coal gangue exhibits high pozzolanic activity, offering a sustainable alternative to Portland cement with dual environmental and economic benefits.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhancing the strength performance of coal gangue through calcination and secondary grinding for sustainable cement replacement

  • 期刊论文

  • 发表日期：

    2025年11月23日

查看全文
  • Yanbing Chen,
  • Linke Yang,
  • Danning Zhou,
  • Yanbing Zhao,
  • Fu Xu

摘要

This study investigates the effects of calcination (650–800°C) and secondary grinding on the phase evolution and reactivity of coal gangue for potential use as a cement substitute. Thermogravimetric-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR) analyses revealed that calcination at 650 °C decomposed kaolinite into amorphous aluminosilicate phases, increasing the specific surface area by 61.6% and enhancing Si/Al dissolution rates. Secondary grinding further improved reactivity, achieving a 28-day compressive strength of 51.2 MPa for mortar containing 30% calcined gangue, surpassing pure cement systems. The optimized process demonstrates that thermally activated and finely ground coal gangue exhibits high pozzolanic activity, offering a sustainable alternative to Portland cement with dual environmental and economic benefits.

Graphical abstract