Springer Science and Business Media Deutschland GmbH;Cham: Springer Science and Business Media LLC
摘要:
摘要： Many disposal concepts currently show that concrete is an effective confinement material used in engineered barrier systems (EBS) at a number of low-level radioactive waste (LLW) disposal sites. Cement-based materials have properties for the encapsulation, isolation, or retardation of a variety of hazardous contaminants. The reactive chemical transport model of HYDROGEOCHEM 5.0 was applied to simulate the effect of hydrogeochemical processes on concrete barrier degradation in an EBS which has been proposed to use in the LLW disposal site in Taiwan. The simulated results indicated that the main processes that are responsible for concrete degradation are the species induced from hydrogen ion, sulfate, and chloride. The EBS with the side ditch drainage system effectively discharges the infiltrated water and lowers the solute concentrations that may induce concrete degradation. The redox processes markedly influence the formations of the degradation materials. The reductive environment in the EBS reduces the formation of ettringite in concrete degradation processes. Moreover, the chemical conditions in the concrete barriers maintain an alkaline condition after 300 years in the proposed LLW repository. This study provides a detailed picture of the long-term evolution of the hydrogeochemical environment in the proposed LLW disposal site in Taiwan. 其他題名： SpringerPlus 其他題名： Springerplus 出版者： Cham: Springer Science and Business Media LLC 出版日期： 2016-06-16 出處： SpringerPlus, 2016-06, Vol.5 (1), p.745-, Article 745 資源來源： Agricultural & Environmental Science Collection 版權： The Author(s) 2016 版權： SpringerPlus is a copyright of Springer, 2016. 識別號： ISSN: 2193-1801 識別號： EISSN: 2193-1801 識別號： DOI: 10.1186/s40064-016-2495-8 識別號： PMID: 27376013
