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<p>Utilizing glass fiber reinforced polymer (GFRP) powders from waste wind turbine blades (WWTB) as a raw material to produce geopolymers not only minimizes environmental pollution but also enhances the added value of the blades. This study explored the effects of various alkaline activator parameters, including modulus, alkali-to-binder ratio, and water-to-binder ratio, on the setting time, compressive strength, and microstructure of the resulting geopolymers. As the modulus of the activator increased from 1.0 to 1.8 and the alkali-to-binder ratio of the activator rose from 4% to 10%, the compressive strength of the hardened paste steadily increased. Additionally, 60&#xa0;°C was the optimal initial curing temperature. Under the optimized preparation conditions, the compressive strengths at 7 days and 28 days reached 14.48&#xa0;MPa and 18.31&#xa0;MPa, comparable to that of conventional fly ash geopolymers. MIP testing revealed that, although the pore sizes of GFRP geopolymers were still larger than those of conventional geopolymers, they shifted towards smaller dimensions compared to GF (glass fiber) geopolymers. FTIR, XRD, TG/DTG, SEM-EDS analyses confirmed that GFRP underwent geopolymerization with an alkaline activator at the microscopic level. Compared to traditional incineration, converting GFRP into geopolymers can reduce CO₂ emissions by approximately 0.3 ton per ton of WWTB.</p>

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Study on the mechanical properties and mechanism of GFRP geopolymer from waste wind turbine blade

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Hui Peng,
  • Yanping Yuan,
  • Yaping Ge,
  • Jikun Yan

摘要

Utilizing glass fiber reinforced polymer (GFRP) powders from waste wind turbine blades (WWTB) as a raw material to produce geopolymers not only minimizes environmental pollution but also enhances the added value of the blades. This study explored the effects of various alkaline activator parameters, including modulus, alkali-to-binder ratio, and water-to-binder ratio, on the setting time, compressive strength, and microstructure of the resulting geopolymers. As the modulus of the activator increased from 1.0 to 1.8 and the alkali-to-binder ratio of the activator rose from 4% to 10%, the compressive strength of the hardened paste steadily increased. Additionally, 60 °C was the optimal initial curing temperature. Under the optimized preparation conditions, the compressive strengths at 7 days and 28 days reached 14.48 MPa and 18.31 MPa, comparable to that of conventional fly ash geopolymers. MIP testing revealed that, although the pore sizes of GFRP geopolymers were still larger than those of conventional geopolymers, they shifted towards smaller dimensions compared to GF (glass fiber) geopolymers. FTIR, XRD, TG/DTG, SEM-EDS analyses confirmed that GFRP underwent geopolymerization with an alkaline activator at the microscopic level. Compared to traditional incineration, converting GFRP into geopolymers can reduce CO₂ emissions by approximately 0.3 ton per ton of WWTB.