Abstract
Foamed grout has been used extensively to backfill disused coal mines, but with densities of between 1000 and 2000 kg/m3. This report describes how two lightweight grouts having densities of 500 and 300 kg/m3 were developed and deployed in order to secure redundant chemical process vessels that were at risk of collapse in a hazardous nuclear environment. In addition to the densities, other important engineering characteristics were needed to achieve a desired quality level. At the end of the deployment approximately 1300 m3 of grout was deployed: 700 m3 of 500 kg/m3 density grout into a vertical shaft section and 600 m3 of 300 kg/m3 density grout into an area with limited loading capacity. This paper describes how the scheme was developed and how it was deployed, and the problems encountered batching large quantities of this experimental product.
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