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http://dx.doi.org/10.11112/jksmi.2011.15.1.281

Durability of GFRP Rebar with Ribs Containing Milled Alkaline Resistant Glass Fibers  

Moon, Do Young (경성대학교 토목공학과)
Oh, Hong Seob (경남과학기술대학교 토목공학과)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.15, no.1, 2011 , pp. 281-287 More about this Journal
Abstract
GFRP rebars could be deteriorated by concrete alkalinity. This paper focuses on the investigation of durability of GFRP rebars with ribs exposed to alkaline environment of concrete. It has been reported that the milled E-glass fibers in the ribs of GFRP rebar can increase bond strength between GFRP rebars and the concrete. In this study, the effect of milled alkaline resistant glass fibers (milled AR glass) and milled E-glass in the ribs on the durability of GFRP rebar is investigated through ISS tests and moist absorption tests of the bare rebar. To accelerate the effect of the alkalinity, high temperature($40^{\circ}C$) was applied. According to the test results, mix ratio of milled glass fibers in the ribs by weight had significant effect on durability of GFRP rebars with ribs. It is because that the high mix ratio may leads more voids in the ribs due to lower workability and formability. On the other hand, changing fiber type in the ribs from E-glass to AR-glass had no improvements on ISS strength of the GFRP rebar. Therefore, it is found that determination of proper mix ratio of milled glass fiber in the mixture for the formation of the ribs of the GFRP rebar is important.
Keywords
Accelerated tests; Alkaline resistant; Ar glass fibers; Durability; GFRP rebar;
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