Long term deflection of reinforced SCC beams

Long-term structural behavior of reinforced Self Compacting Concrete beams has been investigated, according to the four point bending scheme. Time evolution of midspan deflection as well as compressive and tensile strains have been recorded. Experimental data have been then compared with predictions by analytical models, where, as far as rheological properties are concerned, both international codes provisions and experimental data have been used. Model predictions fit quite accurately experimental behavior, even though tension stiffening effect should be improved. Creep-flexural strength interaction has been also investigated by performing failure tests on control beams before and after long-term tests, and on beams subject to long-term loading. Small flexural strength variation has been observed, if the growth of compressive strength due to concrete ageing is taken into account .