Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/16165
標題: 銹蝕鋼筋對鋼筋混凝土握裹性能的影響
Influence of Corroded Bar on the Bond Chacteristics of Reinforced Concrete
作者: 莊大慶
Jhuang, Da-Cing
關鍵字: reinforcement
銹蝕鋼筋
bond
strength
銹蝕度極
限握裹強度
出版社: 土木工程學系所
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摘要: 營建用鋼筋自生產、儲藏到使用等各階段,均有可能發生銹蝕現象。生銹鋼筋若被應用在混凝土構件之中,必然對其握裹性能產生影響。本文採用預先生銹鋼筋,銹蝕度分3%、5%、10%及15%等四種,置入混凝土內,參照ASTM C234,製作握裹試體,進行握裹試驗,探討鋼筋生鏽對RC握裹能力之影響。本文亦考量進行系列的輕質骨材混凝土握裹強度試驗,以與常重混凝土之握裹行為作比較。 試驗結果顯示,銹蝕度增加會降低鋼筋與混凝土間的握裹力;當銹蝕鋼筋的銹蝕度達到10%~15%時,握裹強度平均降低35%~38%,但是銹蝕度(低於3%)輕微者,其握裹強度反而會微幅增加。局部面積銹蝕的鋼筋其銹蝕度達10%~15%時,銹蝕面積40%或60%者的握裹強度比全表面銹蝕者高出約15%。 水灰比(0.66)相同的常重混凝土,其臨界握裹強度與輕質骨材混凝土者相近,而極限握裹強度則明顯高於輕質混凝土者。比較混凝土種類、鏽蝕度、鏽蝕面積及鋼筋尺寸等對於握裹強度的影響可綜合出,鋼筋鏽蝕度高於5%以上時,對握裹強度的主要影響因子為鋼筋的鏽蝕度與鏽蝕深度。
Steel bar may be corroded at various life stages of production, storage, and construction stage. Using the rusty bars as reinforcement of concrete structure will be disadvantageous to its bond strength. This research aims to investigate the effects of corrosive reinforcement on the bond strength between the steel and normal concrete (NC). In addition, the locally produced lightweight aggregate concrete (LWAC) is also adopted to investigate the bond characteristies. In this study,a series of experiments using standard pull-out specimens with various corrosion rates of steel bar were conducted. Test results show that increasing the corrosion of steel bar will decrease the bond strength. When the weight loss of rusty bar increases to 10%~15%, the average bond strength will decrease to 62%~65%. Nevertheles, the steel bar with minor corrosion(less the 3%) can lightly increase the bond strength. For bar corrosion rate at 10%~15%,the bond strength of partially corroded bar(40%~60%) is 15% higher than that of whole surface corroded one.The critical bond strength of NC is quite equal to that of LWAC with same water to cement ratio,but the ultimate bond strength of NC is higher than that of LWAC.Among all test parameters,when the corrossion rate of syeel bar is higher than 5%,the corrosion rate and corroded depth of steel bar have dominate effects upon the bond strength of NC and LWAC.
URI: http://hdl.handle.net/11455/16165
其他識別: U0005-0308201010473700
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