Environmental durability of FRP bond to concrete subjected to freeze-thaw action

An experimental study was performed to determine the environmental durability of the adhesive bond between fiber-reinforced plastic (FRP) and concrete. The study specifically focused on freeze-thaw cycling exposure of such bonds and their ultimate strength prior and after the environmental exposure. To investigate the bond strength 84 single lap shear specimens were manufactured utilizing two different types of carbon FRP pultrued strips and three different structural adhesives for total of three FRP/adhesive combinations. Two types of concrete substrate were used: regular high strength and air-entrained concrete. The specimens were freeze-thaw cycled for three different numbers of cycles using two different freeze-thaw procedures. First freeze-thaw procedure used chloride solution (3% NaCI) as its medium; the second procedure utilized tap water. This main program was complemented by the same freeze-thaw cycling of pull-off specimens of the adhesively bonded system and dumbbell tension specimens of the three adhesives. Coefficients of thermal expansion of the three structural adhesives were also experimentally measured. Results show that the ultimate strength of the adhesive bond between FRP and concrete deteriorates measurably during freeze-thaw cycling in chloride solution. This must be put into perspective as the concrete itself severely deteriorates during this type of freeze-thaw cycling. Therefore, the durability of the adhesive bond between FRP and concrete is dependent on the durability of the concrete.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2006

Author dc:creator

• Dohnálek, Pavel

Advisor dc:contributor.advisor

• Eduardo Kausel.

• Civil and Environmental Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/34644

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/34644