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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Durability of E-Glass/Vinylester Reinforcement in
Author(s): Rajan Sen, Gray Mullins, and Tom Salem
Publication: Structural Journal
Appears on pages(s): 369-375
Keywords: alkali; concrete; durability; polymer; reinforcement.
Abstract:This paper presents results from a 9-month experimental study to evaluate the durability of E-glass/vinylester reinforcement used by the U.S. Navy in the construction of the MRI Pier in San Diego, Calif. A total of 36 specimens were tested. These were split into four groups of 9 specimens each that were exposed to simulated pore solution (SPS) with a pH ranging between 13.35 to 13.5 for periods of 1, 3, 6, and 9 months. Of the nine specimens in each group, a third were unstressed, a third stressed to 10%, while the remaining third were stressed to either 15 or 25% of their ultimate short-term tensile strength. At the end of the designated exposure periods, surviving specimens were tested to failure to determine their residual tensile strength. The results showed that the E-glass/vinylester bars tested had very limited durability in this environment, especially at stress levels of 15% or higher. All six specimens stressed to 25% failed within 25 days of exposure. Five of six specimens stressed to 15% failed within 180 days. Specimens stressed to 10% lost 70% of their original strength after 9 months of exposure. Even unstressed specimens lost 63% of their original strength after 9 months, indicating that diffusion of the alkaline solution through the resin matrix was largely responsible for their degradation. The faster deterioration of the stressed specimens indicated that resin cracking also played a significant role in the degradation. Prediction of remaining life for the test specimens based on a Fickian (diffusion) model was between 1.6 to 4.6 years (unstressed) and between 0.5 to 1.7 years for the specimens stressed to 10%. Overall, the results confirm the unsuitability of first-generation glass fiber-reinforced polymer bars as structural reinforcement in concrete members.
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