Verulam (readers' letters – May 2014)

Institution Fellow, Bob Wilson, suspects that previous titles by Francis Ching notwithstanding, this latest offering might be of more interest to architects than structural engineers.

Pyrite oxidation beneath slabs can crack concrete and lift structures as expanding fill grips substructure walls. In Dublin, remediation revealed wide horizontal cracks that typically close once the expanding fill is removed.

In this article, the various types of formwork and falsework needed to construct a concrete bridge are examined.