Fissures were observed in the 30SBAS30CW (Fig. 9[B]) and 30SBAS50CW (Fig. 9[C]) concrete matrices. The formation of delayed ettringite in the area of the fissure was noticed in the 30SBAS50CW sample (Fig. 9[D]). These concrete samples were extracted from specimens used in the water absorption test, which were dried at 100 ± 5 C for 72 h [23]. This high temperature might have caused such fissures in the cement matrix, which allowed access and transport of agents responsible to the formation of delayed ettringite. Therefore, over the time of exposure (three years) the gypsum reaction might have occurred (from contaminated CW) with the monosulfate hydrate, hence leading to the formation of delayed ettringite [32]. The presence of delayed ettringite can jeopardize the durability of the concrete.