ひび割れ

[V-488] Cracking resistance of precast PC products mixed fly ash

*中野 魁¹、氏家 勲¹、河金 甲²、河合 慶有¹ (1. 愛媛大学大学院、2. 極東興和株式会社)

Keywords:Steam curing, Precast PC Products, Crack resistance, Fly ash

In this study, in order to clarify the cause of the decrease in crack resistance, the restraint stress generated in the specimen that restrains the shrinkage of concrete and the development of tensile strength were examined. The experiments were conducted by changing the presence or absence of mixing of fly ash and the temperature of pre-curing. At a pre-curing temperature of 10℃, the crack resistance of FA concrete may be lower than that of concrete using early strength Portland cement. This decrease is considered to be caused by the difference in the development of tensile strength of concrete at early age due to the presence or absence of fly ash mixing.