Use of Ground Granulated Blast Furnace Slag

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For ground stabilisation and to provide a cut off wall during shaft construction the site team undertook soil mixing activities.

The use of soil mixing itself as a method to stabilise contaminated ground is not in itself new. Nor is the use of a cut-off wall to keep contaminated water out of an area.

The aspect of this work not employed before was the use of the cutter soil mixing to form a safe zone through which to telescope the d-wall shaft similar to the approach a GI contractor would adopt if undertaken “clean drilling” methods.

The use of 80% Ground Granulated Blast Furnace Slag (GGBS) within the cementitious grout mix ensured that the geomix structure was delivered as sustainably as possible, saving approximately 410 tCO2e, while achieving its intended purpose. A similar process will now be taken forward as part of the future CSO works.

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About this entry

Published 26 May 2020
Views 2194

Categories
Carbon offsetting, Conserve of energy,

Size of site
Large,

Level of Best Practice
Good practice,

About the author

Cameron Blackwell
Section Engineer

Entries by this author 3

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Tideway
https://www.tideway.london/

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