ABSTRACT

Abstract FRP elements used for prestressed concrete are primarily subjected to long-term static tensile stress. Hence, their static long-term strength (stress-rupture strength) must be known as function of the time under load and of the environment conditions surrounding the FRP element during service life. The prediction of stress-rupture was founded on extensive tests with FRP in air and alkaline solutions which do not reflect the real concrete conditions. This report deals with a proposal for the prediction of stressrupture in concrete by a theoretical model which has to be calibrated and verified by large size tests on cracked, pre-tensioned concrete slabs in flexure which are exposed to natural weather.