Influences of specific ions in groundwater on concrete degradation in subsurface engineered barrier system

Wen Sheng Lin, Chen Wuing Liu, Ming Hsu Li

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

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.

Original languageEnglish
Article number745
JournalSpringerPlus
Volume5
Issue number1
DOIs
StatePublished - 1 Dec 2016

Keywords

  • Concrete degradation
  • Engineered barriers system
  • Hydrogeochemistry
  • Radioactive waste disposal
  • Reactive chemical transport

Fingerprint

Dive into the research topics of 'Influences of specific ions in groundwater on concrete degradation in subsurface engineered barrier system'. Together they form a unique fingerprint.

Cite this