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The Effect of Silica Fume and Water/Cement Ratio on the Hydraulic Conductivity of Cement-Based Grout

Published online by Cambridge University Press:  28 February 2011

A. A. Al-Manaseer ,
M. Onofrei ,
M. N. Gray  and
B. Shenton
A. A. Al-Manaseer
Affiliation:
AECL Research - Whiteshell Laboratories, Pinawa, Manitoba, Canada, ROE 1L0
M. Onofrei
Affiliation:
AECL Research - Whiteshell Laboratories, Pinawa, Manitoba, Canada, ROE 1L0
M. N. Gray
Affiliation:
AECL Research - Whiteshell Laboratories, Pinawa, Manitoba, Canada, ROE 1L0
B. Shenton
Affiliation:
AECL Research - Whiteshell Laboratories, Pinawa, Manitoba, Canada, ROE 1L0
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Abstract

In situ experiments at Atomic Energy of Canada Limited’s Underground Research Laboratory have demonstrated that a specially developed high-performance cement-based grout, called the reference grout, consisting of 90% sulphate-resistant cement (Canadian Type 50), 10% silica fume (SF) and superplasticizer can seal very fine fissures in granitic rock. Studies are now in progress to determine the longevity of these materials. This paper describes progress in studies of the hydraulic conductivity (i.e. coefficient of permeability), K, of the grout at water/cementitious materials ratios, w/c, between 0.4 and 0.8. The K was assessed with the grouts under compressive and tensile stress using specially designed radial flow permeameters. The results confirm that the K of the reference grout is two to three orders of magnitude lower than that typically observed for intact granite rock (10−12 m/s). Moreover, the data show that adding silica fume and reducing the w/c decreases K. The hydraulic conductivity data coupled with field work and other laboratory data strongly suggest that the reference grout can be successfully used to seal finely fractured rock in the vicinity of a nuclear fuel waste disposal vault.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 212: Symposium P – Scientific Basis for Nuclear Waste Management XIV , 1990 , 433
Copyright
Copyright © Materials Research Society 1991

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References

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