Now John Wallace of Halcrow describes what happene
Last month's Government report on thaumasite sulphate attack may have helped to allay industry fears.Subscription
The two Tredington-Ashchurch and Grove Lane M5 overbridges were built in 1969/70. Both bridges comprise four span continuous in situ reinforced concrete voided slabs, supported on skeleton abutments with encastre pier columns. Deck articulation is by pier flexure with elastomeric abutment bearings. Foundations are spread footings in Lower Lias Clay.