SEDL / STP / STP1137-EB / STP19774S

Bond Loss Between Epoxy and Alkyd Coated Reinforcement Rebars and Concrete

Maldonado, LA
Research Scientist, Centro de Investigación y de Estudios Avanzados, Mérida, Yucatán

Castro, P
Research Scientist, Centro de Investigación y de Estudios Avanzados, Mérida, Yucatán

Marrufo, JH
Profesional Engineer, Universidad Autónoma de Yucatán, Mérida, Yucatán

González, W
Profesional Engineer, Universidad Autónoma de Yucatán, Mérida, Yucatán

Zapata, A
Profesional Engineer, Universidad Autónoma de Yucatán, Mérida, Yucatán

Pages: 14    Published: Jan 1992

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Abstract

Organic coatings are increasingly being used to control corrosion of reinforcing bars but relatively little importance has been given to their effect on the mechanical properties of reinforced concrete elements. This study evaluates the bond loss of coated rebars with respect to uncoated rebars using pull-out tests on 0.15 m× 0.30 m. cylinders and in 0.66 m (length) × 0.15 m (width) × 0.20 m. (height) beams. Three thicknesses of epoxy coatings were tested in both, cylinders and beams. Six thicknesses of alkyd coatings were tested only in cylinders. There were also tests on cylinders and beams with uncoated rebars. Average losses of bond strength for #3 and #4 bar sizes with respect to the uncoated ones were, respectively, 13% and 15% for beams, 25% and 27% for cylinders using epoxy coatings and, 29% and 35% for cylinders using alkyd paints.