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<p>Using one-factor-at-a-time (OFAT) tests, this study experimentally evaluates the effects of re-dispersible polymer powder (RDP) dosage and hollow glass microsphere (HGM) equal-volume replacement ratio on the properties of vitrified microbead (VMB)-based thermal insulating putty. Specimens with different RDP dosages and HGM replacement ratios were tested for consistency (workability), dry density, thermal conductivity, mechanical properties, water resistance, and microstructure. The results show that an RDP dosage of 3.0 wt% provides a favorable balance between mechanical performance and water resistance: compared with the control group, the 28-day compressive and flexural strengths increase by 11.0% and 35.0%, respectively, while water absorption decreases by 15.0%. When VMB is partially replaced by HGM at an equal-volume ratio of 10 vol%, the thermal conductivity decreases to 0.068&#xa0;W/(m·K). SEM and FTIR analyses suggest that HGM may contribute to pore filling and possible secondary reactions, thereby improving the overall material performance. Based on the present OFAT results, a recommended mixture is proposed: 45 wt% VMB, 40 wt% fly ash as a cement replacement, 3 wt% RDP, 0.5 wt% cellulose ether, 0.3 wt% polypropylene fiber, and 10 vol% HGM as an equal-volume replacement of VMB. This mixture provides experimental support for the development of exterior-wall thermal insulating putty materials.</p>

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Effects of hollow glass microsphere and re-dispersible polymer powder dosage on properties of vitrified microbead-based thermal insulating putty

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Shuai Wang,
  • Hao Peng,
  • Zhishan Chen,
  • Yunlong Zhao,
  • Wanwan Fu,
  • Yutao Chen,
  • Longfei Li,
  • Chuqi Huang

摘要

Using one-factor-at-a-time (OFAT) tests, this study experimentally evaluates the effects of re-dispersible polymer powder (RDP) dosage and hollow glass microsphere (HGM) equal-volume replacement ratio on the properties of vitrified microbead (VMB)-based thermal insulating putty. Specimens with different RDP dosages and HGM replacement ratios were tested for consistency (workability), dry density, thermal conductivity, mechanical properties, water resistance, and microstructure. The results show that an RDP dosage of 3.0 wt% provides a favorable balance between mechanical performance and water resistance: compared with the control group, the 28-day compressive and flexural strengths increase by 11.0% and 35.0%, respectively, while water absorption decreases by 15.0%. When VMB is partially replaced by HGM at an equal-volume ratio of 10 vol%, the thermal conductivity decreases to 0.068 W/(m·K). SEM and FTIR analyses suggest that HGM may contribute to pore filling and possible secondary reactions, thereby improving the overall material performance. Based on the present OFAT results, a recommended mixture is proposed: 45 wt% VMB, 40 wt% fly ash as a cement replacement, 3 wt% RDP, 0.5 wt% cellulose ether, 0.3 wt% polypropylene fiber, and 10 vol% HGM as an equal-volume replacement of VMB. This mixture provides experimental support for the development of exterior-wall thermal insulating putty materials.