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<p>The massive stockpile of granite powder (GP) not only occupies the land, but also poses a threat to the environment and human health. The active silica-alumina content in GP is low. Most prepared geopolymers need alkali pretreatment at high temperatures for good compressive strength. Activation of GP with phosphoric acid and synthesis of acid-activated geopolymers is a cost-reducing alternative. In this study, a new green phosphate-based geopolymer was successfully prepared from GP and metakaolin (MK). The optimal preparation conditions were determined by orthogonal tests to be a GP:MK ratio of 4:6, a phosphoric acid concentration of 10&#xa0;M, and a liquid–solid ratio of 0.6. The compressive strength of the prepared geopolymer was 37.48&#xa0;MPa. The microstructure and mechanism of the geopolymer were investigated by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive spectrometer (EDS). It was shown that phosphate-based geopolymers prepared from both GP and MK have higher mechanical properties than those prepared from single GP or MK. “The GP-MK base geopolymer matrix is mainly AlPO<sub>4</sub> and comprises Si–O–P, Si–O–Al–O–P, Al–O–P, and Si–O–Si units”. This study provides a new idea for the comprehensive utilization of GP.</p>

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Preparation and characterization of phosphoric acid activation of granite powder and metakaolin-based geopolymer

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Liuyi Ren,
  • Lu Zhang,
  • Yimin Zhang,
  • Muyang Huang,
  • Zhiming Qiu,
  • Yuxiao Zhou,
  • Shenxu Bao

摘要

The massive stockpile of granite powder (GP) not only occupies the land, but also poses a threat to the environment and human health. The active silica-alumina content in GP is low. Most prepared geopolymers need alkali pretreatment at high temperatures for good compressive strength. Activation of GP with phosphoric acid and synthesis of acid-activated geopolymers is a cost-reducing alternative. In this study, a new green phosphate-based geopolymer was successfully prepared from GP and metakaolin (MK). The optimal preparation conditions were determined by orthogonal tests to be a GP:MK ratio of 4:6, a phosphoric acid concentration of 10 M, and a liquid–solid ratio of 0.6. The compressive strength of the prepared geopolymer was 37.48 MPa. The microstructure and mechanism of the geopolymer were investigated by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive spectrometer (EDS). It was shown that phosphate-based geopolymers prepared from both GP and MK have higher mechanical properties than those prepared from single GP or MK. “The GP-MK base geopolymer matrix is mainly AlPO4 and comprises Si–O–P, Si–O–Al–O–P, Al–O–P, and Si–O–Si units”. This study provides a new idea for the comprehensive utilization of GP.