Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Theoretical investigations of grout seal longevity
Theoretical investigations into the longevity of repository seals have dealt primarily with the development of a methodology to evaluate interactions between portland cement-based grout and groundwater. Groundwater travel times through a seal have been calculated based on Darcy's Law, with an assumed hydraulic gradient for the site and initial hydraulic conductivity for the grout. Chemical interactions between a model grout and actual groundwater compositions have been evaluated by means of geochemical modelling codes. Changes in grout porosity derived from the geochemical modelling have been extended to yield estimates of hydraulic conductivity, based on published experimental results. Also, a preliminary approach to the evaluation of the role of diffusion processes in grout alteration has begun. Results of these investigations suggest that cement grout seals will maintain an acceptable level of performance for tens of thousands to millions of years, provided the repository is sited where groundwater chemistry is compatible with the seals and hydrologic gradients are low. (au) (21 refs.). (Atomindex citation 23:038866)
Theoretical investigations of grout seal longevity
Theoretical investigations into the longevity of repository seals have dealt primarily with the development of a methodology to evaluate interactions between portland cement-based grout and groundwater. Groundwater travel times through a seal have been calculated based on Darcy's Law, with an assumed hydraulic gradient for the site and initial hydraulic conductivity for the grout. Chemical interactions between a model grout and actual groundwater compositions have been evaluated by means of geochemical modelling codes. Changes in grout porosity derived from the geochemical modelling have been extended to yield estimates of hydraulic conductivity, based on published experimental results. Also, a preliminary approach to the evaluation of the role of diffusion processes in grout alteration has begun. Results of these investigations suggest that cement grout seals will maintain an acceptable level of performance for tens of thousands to millions of years, provided the repository is sited where groundwater chemistry is compatible with the seals and hydrologic gradients are low. (au) (21 refs.). (Atomindex citation 23:038866)
Theoretical investigations of grout seal longevity
S. R. Alcorn (Autor:in) / W. E. Coons (Autor:in) / T. L. Christian-Frear (Autor:in) / M. G. Wallace (Autor:in)
1991
37 pages
Report
Keine Angabe
Englisch
Radiation Pollution & Control , Radioactive Wastes & Radioactivity , Ceramics, Refractories, & Glass , Hydrology & Limnology , Grouting , Radioactive Waste Disposal , Seals , Chemical Reactions , Diffusion , Experimental Data , Ground Water , Hydraulic Conductivity , Underground Disposal , Water Influx , Tables(Data) , Cements , EDB/360604 , EDB/052002