1978. Report on Prestressing Steel: 3. Losses of prestress in tendons due to steam curing of concrete (PDF)

This report is one in a series of reports written by members of the FIP Commission on Prestressing Steels and Systems who, for this purpose, worked together in small ad hoc committees to prepare drafts that were subsequently discussed at full Commission meetings.

It has been prepared by Dr. Attila Erdélyi of the Technical University of Budapest and is of great importance. Its purpose is to inform designers and users of precast concrete structures about the influence of steam curing on the relaxation of prestressing steel in pretensioned prestressed concrete, and it provides specific details indicating when these relaxation losses should be taken into consideration. It also shows, however, that in most cases these relaxation losses are of minor importance.

I hope that the report will serve this intended purpose and will be of value to all engineers interested in the use of precast prestressed concrete structural elements.

Finally, on behalf of the Commission, I would like to thank Dr. Erdélyi for his work and for the dedication he has shown in preparing and writing this report, as well as all those who contributed by drafting and commenting on the author’s work.

A.S.G. Bruggeling Chairman