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Seismic, creep, and tensile testing of various epoxy bonded rebar products in hardened concrete.
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2007-02-01
[PDF-2.31 MB]
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Abstract:The objective of this project was to evaluate the performance of currently specified epoxy adhesive anchor systems on various epoxy-coated rebar under seismic, creep and tensile loading. Previous testing of dowel bonding materials for use in hardened concrete was performed on plain rebar, raising the question of their performance on epoxy coated rebar.
The epoxy-coated rebar was found to meet the requirements of ICBO-AC58, Section 5.3.7.2.4, “Conditions of Acceptance” for tension and seismic loading when bonded into hardened concrete using an epoxy adhesive. However, the epoxy-coated rebar did not meet the requirements of the Caltrans Augmentation/Revisions to ICBO-AC58, Section 5.3.3.2, “Conditions of Acceptance” for creep loading when bonded into hardened concrete. The rebar bonded with Covert Operations CIA-Gel 7000 was found to meet the creep requirements, whereas the rebar bonded with Simpson SET22 and Red Head Epcon C6 did not meet the conditions of acceptance for creep loading.
It was also noticed that, when compared to the manufacturer test data, the epoxy-coated rebar outperformed uncoated rebar in allowable tensile loads for two of the three epoxies tested. Simpson SET22 adhesive under performed the manufacturer test data. Revision (2007): Upon further review of the creep data for the rebar bonded with Simpson SET, it was determined that the adhesive met the creep requirement. Due to the load fluctuations, only the first 26 days of data were used for the logarithmic curve fit.
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