Designing concrete with short service life utilising thaumasite

Authors: H. Justnes, K. I. Johansen

Source: Advances in Applied Ceramics

Publisher: Maney Publishing

Abstract:

Concrete anchors for detectors used in electromagnetic surveys of subsea oil resources should be made with a short service life so that they will disintegrate to sludge and gravel after a few months at sea. This is partly because they should not become obstacles for later trawling after fish, but also to refloat the expensive detectors at a later stage if the release mechanism should fail. The immediate solution was to make a concrete recipe consisting of CEM I, anhydrite and limestone that would convert the cementitious binder to non-hydraulic thaumasite when wet. It is demonstrated how sufficient compressive strength was obtained for such mixes for the first few months, after which they disintegrated completely within 6 months in sea water.

Document Type:

DOI: 10.1179/174367609X459577

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