Abstract
The tensile behavior of steel fiber-reinforced-carbon/glass hybrid composite bars (S-CG HCBs) in concrete environment was experimentally investigated. The influences of the steel fiber content (VS) and the carbon-glass ratio (VC/VG) on the tensile behavior of corroded S-CG HCBs were analyzed. The optical microscope (OM) was used to reveal the morphology and corrosion mechanism of S-CG HCBs. The results show that under tensile load, S-CG HCBs exhibited a pseudo-yield platform due to the separate fracture of the three types of fibers and the buckling of steel fibers. The retentions of yield and ultimate strengths of the S-CG HCBs in alkaline solution increased with the VS or VC/VG increased due to the reduction of glass fiber content and its more inferior alkali resistance than carbon and steel fibers. After 63 days of corrosion at a 40 ℃, the specimen (S30C1G6), whose VS and VC/VG are 30% and 1/6, respectively, exhibited the highest tensile strength retention rate of 87.88% compared to other specimens. In addition, the tensile stress retention of S-CG HCBs serviced in concrete environment under various ambient temperatures was predicted based on the Arrhenius equation.
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