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<p>Geopolymers (GP) exhibit advantages such as short setting time, high strength, good corrosion resistance, and excellent high-temperature resistance. However, they still face challenges in 3D printing applications, including a short open time and poor buildability. This study aims to investigate the effects of hydroxypropyl methylcellulose ether (HPMC) on the physical properties and 3D printing performance of basalt powder-based geopolymer mortar (BPGPM). In addition, x-ray diffraction (XRD) and scanning electron microscopy with energy dispersive x-ray spectroscopy (SEM-EDS) were employed to analyze the hydration products and microstructure of BPGPM samples incorporating HPMC. The results indicate that the incorporation of black quartz sand prolongs the setting time of basalt powder-based geopolymer paste (BPGPP). Furthermore, the extrudability and buildability of BPGPM were improved to varying degrees with the incorporation of 0.1-0.3% HPMC. After incorporating 0.2% HPMC, the compressive strength of BPGPM at curing ages of 7 and 28&#xa0;d was enhanced. In addition, the transverse compressive strength of BPGPM gradually increased with the addition of 0.1-0.3% HPMC. XRD and SEM analyses demonstrate that HPMC improves the hydration environment and promotes gel formation within the system.</p>

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The Effect of HPMC on the Physical and 3D Printing Properties of Basalt Powder-Based Geopolymer

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Zhenguo Li,
  • Zhuhui Li,
  • Jing Zhu,
  • Lili Jiang,
  • Dongye Wang

摘要

Geopolymers (GP) exhibit advantages such as short setting time, high strength, good corrosion resistance, and excellent high-temperature resistance. However, they still face challenges in 3D printing applications, including a short open time and poor buildability. This study aims to investigate the effects of hydroxypropyl methylcellulose ether (HPMC) on the physical properties and 3D printing performance of basalt powder-based geopolymer mortar (BPGPM). In addition, x-ray diffraction (XRD) and scanning electron microscopy with energy dispersive x-ray spectroscopy (SEM-EDS) were employed to analyze the hydration products and microstructure of BPGPM samples incorporating HPMC. The results indicate that the incorporation of black quartz sand prolongs the setting time of basalt powder-based geopolymer paste (BPGPP). Furthermore, the extrudability and buildability of BPGPM were improved to varying degrees with the incorporation of 0.1-0.3% HPMC. After incorporating 0.2% HPMC, the compressive strength of BPGPM at curing ages of 7 and 28 d was enhanced. In addition, the transverse compressive strength of BPGPM gradually increased with the addition of 0.1-0.3% HPMC. XRD and SEM analyses demonstrate that HPMC improves the hydration environment and promotes gel formation within the system.