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Tuff-Cement or Concrete Interactions in the Repository Environment

Published online by Cambridge University Press:  26 February 2011

Sridhar Komarneni ,
Della M. Roy  and
Amitabha Kumar
Sridhar Komarneni
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802 USA
Della M. Roy
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802 USA
Amitabha Kumar
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802 USA
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Abstract

Hydrothermal interactions of tuff or tuff minerals with cement or concrete were investigated at 200 0C under a confining pressure of 8 or 30 MPa for I to 20 weeks. These chemical interactions produced crystalline hydrous calcium silicates such as Al-substituted tobermorite, xonotlite and gyrolite. Tobermorite was the most common interaction product of cement and tuff or tuff minerals because of pozzolanic reaction. The extent of cement hydration and the quantity of cement in the cement mix affected the abundance of tobermorite as expected. The reaction of concrete with tuff resulted in the formation of smectite in addition to tobermorite due to the generation of slight acidic conditions in this reaction mixture under the present hydrothermal conditions. The formation of tobermorite by the interaction of tuff with cement or concrete has positive implications to the physical (bonding) and chemical (sorption) properties in the repository sealing system because tobermorite (Al-substituted) acts both as a binding agent and as a cation exchanger.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 44: Symposium N – Scientific Basis for Nuclear Waste Management VIII , 1984 , 927
Copyright
Copyright © Materials Research Society 1985

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