BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Talks.cam//talks.cam.ac.uk// X-WR-CALNAME:Talks.cam BEGIN:VEVENT SUMMARY:Fire behavior of concrete elements built and prestressed with inte rnal CFRP reinforcement - Dr Giovanni Terrasi - Empa\, The Swiss Federal L aboratories for Material Science and Technology DTSTART:20151028T150000Z DTEND:20151028T160000Z UID:TALK60773@talks.cam.ac.uk CONTACT:Lorna Everett DESCRIPTION:In the last decade Empa’s Mechanical Systems Engineering dpt m and SACAC ltd developed sustainable precast concrete elements utilizing high-performance\, self-consolidating\, fibre-reinforced concrete (HPSCC) reinforced with high-strength\, lightweight\, and non-corroding prestresse d carbon fibre reinforced polymer tendons. One example of this is a new ty pe of precast carbon FRP pretensioned HPSCC panel intended as load-bearing panels for glass concrete building facades.\nIt is known that the bond st rength between both steel and FRP\nreinforcing tendons and concrete deteri orates at elevated temperature and that high strength concrete tends to an explosive spalling failure mode when subjected to a fire. The bond streng th reductions in fire\, their impacts on the load-bearing capacity of pres tressed concrete structures\, and the spalling behaviour of high-strength concrete remain poorly understood. This paper gives insight in the fire\nb ehaviour of filigree CFRP prestressed HPSCC slabs and presents selected re sults and analysis of an experimental fire test series on 45 mm and 60 mm thin-walled slabs with and without an additional external mineral fire pro tection coating. The main findings are that the fire resistance of the sla bs is determined by spalling of the HPSCC or – if spalling can be avoide d by the use of either polypropylene microfibers with or without the addit ion of superabsorbing polymers in the concrete – by the thermal splittin g-crack induced bond failure of the CFRP tendons. LOCATION:Cambridge University Engineering Department\, LR5 END:VEVENT END:VCALENDAR