Mechanical and Durability Screening Test Methods for Cylindrical CFRP Prestressing Tendons

Abstract

Concrete prestressed with carbon fibre reinforced polymer (CFRP) tendons beneficially utilises the strain capacity and durability characteristics of the CFRP material. However, changes to CFRP tendon material formulations or production processes present a challenge when building up a body of knowledge to inform the long-term behaviour of a prestressed concrete system. Initial qualification tests can help identify the potential for FRP tendons to meet long-term mechanical and durability requirements. Protocols that can be undertaken on commercially produced cylindrical FRP pultrusions are particularly advantageous since the constituent materials and manufacturing processes are representative of the actual product.

Glued-in CFRP and GFRP rods in block laminated timber subjected to monotonic and cyclic loading

“…Epoxy (EPX) adhesives exhibit higher bond strength regardless of the glue-line thickness. Yet, different epoxies can yield different bond performances and failure modes [10] and their standardisation is hindered due to constant advances in resin formulations that are usually proprietary to the manufacturers [11]. Feligioni et al [12] showed that ductile epoxies in glued-in steel rods yield a more 'ductile' pull-out load -slip relationship and superior withdrawal resistance compared with brittle epoxies.…”

Experimental Study on the Flexural Creep Behaviors of Pultruded Unidirectional Carbon/Glass Fiber-Reinforced Hybrid Bars

“…The theoretical results were obtained from estimations based on simple beam calculations. The initial flexural modulus E x0 in this experiment was determined by following the ASTM D 4476-09 [39] standard. E x0 was assumed to be identical for all samples.…”