Durability of carbon fibre reinforced polymer (CFRP) strand for use in high capacity permanent ground anchors

Steel strand ground anchors are vulnerable to corrosive attack from aggressive ground environments. Current permanent ground anchor standards require the use of double protection systems encapsulating the steel strands, to ensure a serviceable design life. In recent times, FRP reinforcement has been successfully researched and used as a durable construction alternative to steel. Minimal research has been devoted to developing FRP strands for use in high capacity ground anchors. The paper summarises current research knowledge, best practices for use of CFRP strands in ground anchor systems and an interim report on CFRP strand durability performance in comparison to steel strands, when exposed to extreme aggressive environments over time at accelerated temperature in both stressed and unstressed state.