Title:
Development Length of Epoxy-Coated Prestressing Strand
Author(s):
Thomas E. cousins, David W. Johnston, and Paul Zia
Publication:
Materials Journal
Volume:
87
Issue:
4
Appears on pages(s):
309-318
Keywords:
bonding; building codes; corrosion resistance; epoxy resins; fatigue (materials); prestressed concrete; prestressing steels; pretensioning; protective coatings; Materials Research
DOI:
10.14359/1999
Date:
7/1/1990
Abstract:
To provide corrosion protection in adverse environments, seven-wire prestressing strand is being coated with a grit-impregnated epoxy. The effect of the epoxy coating and grit on development length for three different sizes of prestressing strand was investigated. The development length of three different densities of grit were studied as well. Also, some test specimens were subjected to a fatigue loading to investigate the effect on bond between the pretensioned strand and concrete. Approximately 35 test specimens were cast for the study of the development length of epoxy-coated and bare (uncoated) prestressing strand.The development length was determined using an iterative test scheme. A fatigue load was applied to precracked specimens fabricated with epoxy-coated and uncoated strand to determine the effect of such a load on development length and transfer length of both types of strand. The experimental and analytical results from this research were compared to the results in the literature, provisions in the ACI Building Code (ACI 318-83), and previously proposed bond provisions.