低放射性最終處置設施之主體為混凝土，但不同於一般混凝土結構物之用途，低放射性最終處置設施服務年限至少需300 年以上。另外由於台灣環境氣候潮濕、四面環海，場址之選擇可能位於臨海區域且採用淺層處置，考量處置場混凝土工程障壁或最終處置盛裝容器材料可能受海水或地下水作用造成侵蝕劣化，進而影響混凝土長期耐久性。因此，必須充分考量混凝土在最終處置環境中可能發生之各種劣化機制。本研究利用活性粉混凝土(Reactive Powder Concrete, 簡稱RPC)為處置場工程障壁材料，首先根據最終處置盛裝容器可能採用之活性粉混凝土配比進行抗壓強度試驗、超音波速試驗及動彈性模數試驗，瞭解材料基本物理性質特性，並針對可能遭遇各種環境侵襲，分別進行耐久性長期試驗，包括：氯離子入侵、硫酸鹽侵襲、中性化、混凝土組成元素流失等試驗，以掌握最終處置盛裝容器之耐久性參數及劣化機制，推估盛裝容器材料在最終處置環境作用下之劣化狀況。嘗試建立障壁用混凝土材料能否滿足最終處置場服務年限需求之驗證項目與指標，供管制機關障壁功能安全審查參考之用。 Engineered barrier and high integrity container for the final disposal of low-level radioactive wastes serve to isolate the wastes from human biosphere for a very long design life. Concrete has been widely accepted as engineering barrier material due to its longevity, which provides good structural integrity for prolonged service life. Recently, reactive powder concrete (RPC) has been proposed as barrier materials for the construction of engineered barrier and high integrity container. However, the durability properties of RPC remain unanswered and there is very limited information available in the literature. On the other hand, the adverse environmental conditions at the disposal site could attack concrete barrier material and results in degradation of the material. The proposed study focuses on the durability properties and degradation behavior of reactive powder concrete as an engineered barrier subjected to adverse environmental and geochemical conditions at the final disposal site. Laboratory tests will be conducted on RPC with various compositions to investigate the physical and durability properties of RPC. These include mechanical strength, pulse velocity, dynamic modulus, and sulfate attack, chloride ion ingress, carbonization, and leaching of reactive powder concrete, respectively. The degradation process of concrete material under simple adverse environment has been studied by many researches so far, this study aims to develop a model for the safety evaluation of reactive powder concrete barrier material for applications to final disposal of low-level radioactive wastes. In addition, the evaluation model developed will be used in the review processes of barrier design for the low-level radioactive wastes disposal site. 研究期間：10001 ~ 10012
