Abstract
AbstractAn experimental study that investigates the nonlinear stress relaxation behavior of concrete under sustained strains is presented. Reinforced concrete structures experience both creep and relaxation during their service life. While the creep behavior of concrete has been widely investigated, very little is known regarding its relaxation behavior. This investigation includes testing of concrete cylinders under sustained uniaxial compressive strains. The tests are conducted at two different ages of the concrete to highlight the influence of shrinkage and aging on the behavior. A rigid displacement-control hydraulic system that allows testing of concrete cylinders under sustained strains with monitoring of the stress relaxation with time is used. The sustained strain levels correspond to initial stress levels of 35 and 50% of the compressive strength for one set of testing, and to stress levels of 30 and 60% in the other set. For better understanding of the behavior, the relaxation tests are also acc...
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