Concrete structures are susceptible to degradation due to delayed strains that have an impact on their safety margin and lifetime, especially when they are subjected to a high loading level. Few studies have investigated the effects of creep loading history on failure mechanisms, including its influence on strength, stiffness, and fracture energy. Most of these studies have tried to quantify the effect of creep on the behavior of concrete mainly by measuring the residual strength (Carpinteri, Valente, Zhou, Ferrara, & Melchiorri, 1997; Cook & Haque, 1974; Denarié, Cécot, & Huet, 2006; Liniers, 1987; Omar, Loukili, Pijaudier-cabot, & Le Pape, 2009; Shah & Chandra, 1970). Deformation and fracture of concrete are associated with very complicated progressive failure, and it is usually accepted that the failure process under a sustained load is associated with the development and growth of micro-cracking (Barpi & Valente, 2005; Bazant & Li, 1997; Rossi, Godart, Robert, Gervais, & Bruhat, 1994; Rossi, Tailhan, Le Maou, Gaillet, & Martin, 2012). Thus, understanding the behavior of concrete requires the detailed assessment of creep and the part of damage. Micro-cracking and damage localization in concrete beams cannot be investigated by the classical mechanical measurements. So, as a part of the investigation, the acoustic emission (AE) technique can be applied.