The precast concrete segmental construction method is an effective method to replace the deteriorated concrete for rapidity. The precast concrete segmental method is widely applicable to various structures with including concrete pavements, bridge decks, buildings, and special structures such as nuclear power plant. The precast concrete is used in the nuclear power plant as the form of precast girder for turbine generator pedestal, supports, wall system, etc (Tatum 1983). This paper presents the result of an experimental study (Jang et al., 2013) conducted to investigate the flexural strength of precast concrete segments with joint grouts. All specimens had no reinforcement. Three types of cementitious grout material, i.e., ordinary cement mortar, shrinkage compensating cement mortar, and polymer cement mortar, were filled between precast concrete segments. In addition, two types of joint space, 2 cm and 5 cm, were examined. The experimental results showed that a typical failure mode was bond failure. However, only a precast concrete segment with joint space of 5 cm connected by a polymer cement mortar showed flexural failure mode due to sufficient bond strength between a precast concrete segment and a polymer cement mortar grout to behave in a body. The maximum strengths were high according to the order of polymer cement mortar, shrinkage compensating cement mortar, and ordinary cement mortar. In addition, flexural strength in the case of joint space of 2 cm was larger than that of 5 cm.
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