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- W569609851 abstract "If AFRP tensile elements are to be used for the pre-tensioning of precast elements or for post-tensioning of structures with bonded tendons (cementitious grout), then their durability under high permanent tensile stress and the specific environment of concrete's or grout's porewater with ph 13 must reliably be known. Measure of durability is thereby the stress-rupture strength as the relevant design resistance. The stress-rupture strength is classically studied by subjecting the FRP to an alkaline solution with a chemical composition similar to that of the porewater. It is however known that such artificial environment is far too harsh and does not realistically reflect the stress-corrosive damage potential of initially fresh and then hardened concrete. In dense cement stone, the availability and the mobility of water and therein dissolved cations is dramatically reduced. In order to study the stress-rupture behavior of stressed AFRP bars (Arapree) in concrete, comprehensive tests were performed. In all, 36 pre-tensioned slabs were produced and, after pre-cracking, exposed to several environmental climates for 36 months, at the longest. During the exposure, the slabs were permanently loaded in flexure with open cracks. After certain periods of time, the slabs were tested to failure. After the tests, visually undamaged AFRP bars were retrieved from crack-free zones of the slabs and then subjected to the following tests: residual tensile strength and stress-rupture strength in alkaline solution. The experiments prove that the lifetime of stressed AFRP bars in dense concrete by far exceeds the lifetime of AFRP subjected to alkaline solution." @default.
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- W569609851 title "STRESS-RUPTURE BEHAVIOR OF AFRP-BARS IN CONCRETE AND UNDER NATURAL ENVIRONMENT" @default.
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