Title:
Evaluating Buildings With Unbonded tendons
Author(s):
Morris Schupack
Publication:
Concrete International
Volume:
13
Issue:
10
Appears on pages(s):
52-57
Keywords:
corrosion; durability; evaluation; nondestructive tests; post-tensioning; prestressing steels; unbonded prestressing; standards; General
DOI:
Date:
10/1/1991
Abstract:
Unbonded tendons have become the predominant type used for post-tensioning in the United States. From 1965 through 1989, approximately 1 million t of bonded and unbonded post-tensioned tendons were used (excluding those used in wire wrapped pipes and tanks). Of this number, approximately 730,000 t were unbonded tendons of various types, with the single-strand, plastic-encapsulated tendon predominating. This equates to well over 1 billion ftý of building constructed from 1965 to 1989. With this significant volume of construction, there is a need to evaluate the structural conditions of buildings prestressed with unbonded tendons.