Academic Journals Database
Disseminating quality controlled scientific knowledge

A Talc-Based Cement-Poor Concrete for Sealing Boreholes in Rock

ADD TO MY LIST
 
Author(s): Roland Pusch | Laurence Warr | Georg Grathoff | Alireza Pourbakhtiar | Sven Knutsson | Mohammed Hatem Mohammed

Journal: Engineering
ISSN 1947-3931

Volume: 05;
Issue: 03;
Start page: 251;
Date: 2013;
Original page

Keywords: Clay | Concrete | Ductility | Strength | Superplasticizers | Talc

ABSTRACT
Deep investigation boreholes in crystalline rock for site selection of repositories for high-level radioactive waste are proposed to be sealed by installing a series of dense concrete and clay plugs. These should prevent radionuclides from leaking canisters at depth to migrate to the biosphere through the holes. The concrete seals will be installed where the holes intersect water-bearing fracture zones to serve as stable and low-permeable supports for adjacent clay plugs. Low porosity and microstructural stability must be guaranteed for many thousands of years and ordinary Portland cement with organic superplastizer will not fulfill the requirements since the high pH will cause degradation of contacting clay and the organic additive can produce colloids with a capacity to carry radionuclides up to the biosphere. Very cement-poor concrete (
RPA Switzerland

RPA Switzerland

Robotic process automation

    

Tango Rapperswil
Tango Rapperswil