The Structural Engineer > Archive > Volume 92 (2014) > Issues > Issue 5 > Sulphate-generated heave – the effect on structures in Dublin
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Sulphate-generated heave – the effect on structures in Dublin

During remediation of distressed buildings in Dublin, horizontal cracks more than 20mm wide have been seen in the concrete block sub-structure walls. When pyrite-rich calcareous aggregate oxidises beneath a ground floor slab, it can raise and crack the concrete floor. In addition, it has been found that when tightly compacted fill expands, it may grip the substructure walls such that the whole super-structure is lifted off these support walls.

Author(s): P. Finnegan (Dublin City Council), P. M. Forde (DBFL Consulting Engineers, Dublin) and A. B. Hawkins (Engineering Geological Consultant, Bristol)