Scholarlink

<p>The long-term durability of metakaolin (MK)-based geopolymer waste forms was evaluated under simulated disposal environments. Specimens incorporating Cs, Sr, and Co were fabricated and subjected to ANSI/ANS 16.1 leaching tests in deionized water (DI), concrete-saturated groundwater (CGW), and CGW combined with gamma irradiation (CGW + γ). Compressive strength, leachability index (LI), microstructure, and surface chemistry were analyzed to evaluate mechanical and chemical stability. All specimens initially satisfied the disposal acceptance criterion (≥ 3.45&#xa0;MPa). The compressive strength remained stable in DI but declined under CGW due to alkali-induced degradation. Under the CGW + γ condition, severe strength loss occurred, and several specimens fractured completely. Leaching tests revealed substantial LI reduction for Cs, Sr, and Co. Computed tomography imaging showed increased porosity under CGW + γ, while X-ray photoelectron spectroscopy analysis confirmed Cs and Sr surface enrichment with the reduction of Co<sup>3+</sup> to Co<sup>2+</sup>. These results indicate that while MK-based geopolymers demonstrated strong resistance to individual degradation factors, they experienced significant structural deterioration under combined alkaline and radiation conditions, providing critical insights for the safe disposal of radioactive wastes.</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

Combined Effects of Alkaline Groundwater and Gamma Irradiation on the Durability of Geopolymer Waste Forms

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月23日

查看全文
  • Seongye Kwon,
  • Yulim Lee,
  • Yujin Oh,
  • Jaeyeong Park

摘要

The long-term durability of metakaolin (MK)-based geopolymer waste forms was evaluated under simulated disposal environments. Specimens incorporating Cs, Sr, and Co were fabricated and subjected to ANSI/ANS 16.1 leaching tests in deionized water (DI), concrete-saturated groundwater (CGW), and CGW combined with gamma irradiation (CGW + γ). Compressive strength, leachability index (LI), microstructure, and surface chemistry were analyzed to evaluate mechanical and chemical stability. All specimens initially satisfied the disposal acceptance criterion (≥ 3.45 MPa). The compressive strength remained stable in DI but declined under CGW due to alkali-induced degradation. Under the CGW + γ condition, severe strength loss occurred, and several specimens fractured completely. Leaching tests revealed substantial LI reduction for Cs, Sr, and Co. Computed tomography imaging showed increased porosity under CGW + γ, while X-ray photoelectron spectroscopy analysis confirmed Cs and Sr surface enrichment with the reduction of Co3+ to Co2+. These results indicate that while MK-based geopolymers demonstrated strong resistance to individual degradation factors, they experienced significant structural deterioration under combined alkaline and radiation conditions, providing critical insights for the safe disposal of radioactive wastes.