Grouting of external tendons-a practical perspective

This paper surnmarises the extensive grouting operation on a 1.7 km long externally post-tensioned precast segmental viaduct, part of the recently opened phase of improvements to the A13 trunk road in Dagenham. The authorsʹ intention is to provide practical feedback to the industry on specific items such as air testing, ducting and grouting as well as linking this to the Concrete Societyʹs Technical Report No. 47. Experiences described also include the clientʹs instruction of a full-scale grouting trial preceding the permanent works grouting and aspects of grouted tendon replacement. Emphasis is given to practical considerations that are important for a successful grouting operation.