腐食・防食Ⅰ

[1187] Numerical Investigation of Effects of Material Properties on Corrosion-induced Concrete Crack Propagation

座長(土木)：河野広隆
座長(建築)：兼松学
講演者：Di QIAO¹, 中村光², 三浦泰人² (1.Nagoya University 2.名古屋大学)

キーワード：corrosion, cracking, fracture energy, RBSM, spalling volume, ひび割れ, 剥落量, 破壊エネルギー, 鉄筋腐食

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The study focuses on effects of material properties, specifically fracture energy and tensile strength, on corrosion-induced cracking behavior, which are investigated analytically with Rigid Body Spring Method combined with corrosion expansion model. Various material properties are introduced into the analytical model to investigate the influences on crack propagation. The analytical results show that surface crack initiation is determined by tensile strength while the increase of fracture energy will slow down the propagation of surface crack. In addition, it is found that high fracture energy will lead to internal cracks of wide specimen propagating diagonally to concrete surface rather than sides of specimen as those of narrow specimen do, which constrains the final spalling volume. Consequently, it can be identified that ductile materials with high fracture energy is efficient to limit the cracking damage on concrete caused by rebar corrosion.