Tensile creep rupture of glass microfiber-modified epoxy resin for anchoring FRP cables

The tensile properties of modified resin-based load transfer components (LTCs) for cable anchoring systems were experimentally determined, considering the modified materials, volume fraction (VF), and hybrid ratio. Tensile creep behavior was assessed over 1000 hours using five stress levels. The results showed that vacuuming increased tensile strength by 64.4–176.1 % and elastic modulus by 10.2–62.1 %. Adding fiber improved tensile strength, whereas adding sand had a detrimental effect. Hybrid ratio had a limited impact on enhancing tensile strength and modulus. Long fibers possessed superior enhancement than short fibers and sand. The modified resin's elongation decreased as the modifier VF increased. Both plain resin and single quartz sand-modified resin (SSMR) could withstand creep stress of 0.3 f u ( f u =ultimate strength) for 1000 hours, whereas single glass microfiber-modified resin (SFMR) could endure up to 0.5 f u . SFMR exhibited longer creep rupture time compared to SSMR. Over 120 years, as VFs increased, the creep rupture stress of SFMR increased by 41.6 %, 50.0 %, and 66.2 % respectively when compared to plain resin alone. Both the Burges and modified logarithmic models accurately predicted the 1000-hour creep by accounting for changes in tensile creep growth rate. • Single/hybrid microfibers and single sand were used to modify resin-based LTCs. • The short- and long-term tensile creep behaviors of LTCs were investigated. • The enhancement effect of fibers was found to be superior to that of sand.