Bond of prestressing tendons (AGB2002/006)
Overview
Background & policy context:
Bond between concrete and reinforcement enables the transfer of forces from the reinforcement to the surrounding concrete. The load-deformation behaviour of reinforced and prestressed concrete members in the cracked state is largely influenced by the bond behaviour. Contrary to reinforcing and pre-tensioning steel the bond behaviour of post-tensioning tendons has not been the subject of much research. The present project aims at filling this gap.
Objectives:
Important influences on the bond behaviour of post-tensioning tendons will be investigated by performing 36 large-scale experiments. Test parameters include
(i) the tendon size;
(ii) the kind of duct (steel or plastic);
(iii) the grout strength;
(iv) the presence of a corrosion inhibitor (Rustban 310); and
(v) the direction of loading (loading e.g. due to live load or unloading e.g. due to cutting of a tendon).
Previously developed theoretical models of the bond behaviour of partially prestressed concrete members will be refined and simplified for practical applications.
Methodology:
28 tests on large-scale prismatic specimens will be performed to investigate the bond behaviour of post-tensioning tendons.
In addition, eight tests will be performed to investigate whether a corrosion inhibitor may be used in conjunction with (fixed) bond anchorages.
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