| Abstrakt: |
Pultruded carbon fiber-reinforced polymer (CFRP) rods have been increasingly used as strengthening elements due to characteristics such as lightweight, high strength and stiffness, reduced maintenance cost, easy handling and high resistance to oxidative corrosion compared to traditional materials. Recently, these rods have become candidates for tendons in applications of grouted ground anchors, as an alternative to steel-made ones. However, to exploit their full potential, the ageing and degradation characteristics under different working environments need to be better understood, particularly regarding damage mechanisms. This work investigates how accelerated ageing under different conditions (distilled water, seawater, UV radiation plus water-spray) for up to 3000 h affects short beam strength of pultruded CFRP rods with epoxy and vinylester matrices. Pristine and aged rods were evaluated using water uptake and thermogravimetric analysis, and reflected light and scanning electron microscopies to help understanding the interlaminar shear performance, focusing on the fiber/matrix interface degradation mechanisms leading to failure. The mechanical performance of vinylester rods was much more sensitive to fiber/matrix interface deterioration than those with epoxy, with fiber/matrix debonding being the main failure micromechanism. [ABSTRACT FROM AUTHOR] |
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