A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Aspects of Clay/Concrete Interactions (Aspects des Interactions Beton-Argile)
In the Canadian concept for nuclear fuel waste management, both clay-based materials and concrete are proposed for use as barriers, seals or supporting structures. The main concern when clays and concrete are in proximity is the generation of a high-pH environment by concrete since clay minerals are relatively unstable at high pH. Here we examine the OH-generating capacity of two high-performance concretes when in contact with several solutions. We also investigate various aspects of clay/concrete interactions. They are: (1) the alkalimetric titration of clay suspension, (2) the effect of Ca(OH)2 (portlandite) on the swelling and hydraulic properties of compacted bentonite, and (3) the influence of cement grout on a backfill clay retrieved from the 900-d Buffer/Container Experiment at the Underground Research Laboratory of AECL. The results of this study suggest that the performance of compacted clay-based barriers in a disposal vault will be markedly affected by contact with low-pH high-performance concrete. The conclusion is, by and large, supported by the literature on clay/concrete interactions.
Aspects of Clay/Concrete Interactions (Aspects des Interactions Beton-Argile)
In the Canadian concept for nuclear fuel waste management, both clay-based materials and concrete are proposed for use as barriers, seals or supporting structures. The main concern when clays and concrete are in proximity is the generation of a high-pH environment by concrete since clay minerals are relatively unstable at high pH. Here we examine the OH-generating capacity of two high-performance concretes when in contact with several solutions. We also investigate various aspects of clay/concrete interactions. They are: (1) the alkalimetric titration of clay suspension, (2) the effect of Ca(OH)2 (portlandite) on the swelling and hydraulic properties of compacted bentonite, and (3) the influence of cement grout on a backfill clay retrieved from the 900-d Buffer/Container Experiment at the Underground Research Laboratory of AECL. The results of this study suggest that the performance of compacted clay-based barriers in a disposal vault will be markedly affected by contact with low-pH high-performance concrete. The conclusion is, by and large, supported by the literature on clay/concrete interactions.
Aspects of Clay/Concrete Interactions (Aspects des Interactions Beton-Argile)
D. W. Oscarson (author) / D. A. Dixon (author) / M. Onofrei (author)
1997
47 pages
Report
No indication
English
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