| 超高韧性水泥基复合材料取代保护层混凝土梁抗锈蚀性能研究 |
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| 引用本文： | 徐世烺,蔡新华.超高韧性水泥基复合材料取代保护层混凝土梁抗锈蚀性能研究[J].土木工程学报,2011(5):79-85. |
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| 作者姓名： | 徐世烺 蔡新华 |
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| 作者单位： | 浙江大学;武汉大学水资源与水电工程科学国家重点实验室; |
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| 基金项目： | 国家自然科学基金重点项目(50438010); 南水北调工程建设重大关键技术研究及应用(JGZXJJ2006-13); 浙江省科技计划公益技术研究工业项目(2010C31123) |
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| 摘 要： | 将超高韧性水泥基复合材料(UHTCC)应用于钢筋混凝土梁的保护层,制作受拉侧UHTCC保护层厚度为15mm(不包含受拉钢筋)、50mm(包含受拉钢筋)的钢筋混凝土/UHTCC复合梁及全梁均为UHTCC和混凝土的4种简支梁,在人工加速锈蚀条件下使主筋锈蚀,考察采用UHTCC做钢筋混凝土梁保护层对于抑制钢筋锈蚀引起保护层锈胀开裂的功效,并对锈蚀后梁的弯曲性能进行试验研究和分析。结果表明,UHTCC部分取代保护层混凝土(包含受拉钢筋)能有效抑制或延缓钢筋锈蚀引起的保护层开裂,有效提高混凝土结构或构件的服役寿命。锈蚀后梁的弯曲试验表明,利用UHTCC部分(50mm)或全部取代混凝土梁钢筋锈蚀后梁破坏形式不发生变化,承载力下降不明显。
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| 关 键 词： | 超高韧性 钢筋锈蚀 锈胀开裂 多缝开裂 弯曲试验 |
Corrosion resistance of reinforced concrete beams with cover replaced by UHTCC |
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| Xu Shilang Cai Xinhua.Corrosion resistance of reinforced concrete beams with cover replaced by UHTCC[J].China Civil Engineering Journal,2011(5):79-85. |
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| Authors: | Xu Shilang Cai Xinhua |
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| Affiliation: | Xu Shilang1 Cai Xinhua2(1.Zhejiang University,Hangzhou 310058,China,2.State Key Laboratory of Water Resources and Hydropower Engineening Science,Wuhan University,Wuhan 430072,China) |
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| Abstract: | Four types of beams,including reinforced concrete beam with the cover zone replaced by ultra high toughness cementitious composites(UHTCC)(thickness 15mm if not counting the reinforcements,50mm if counting the reinforcements),reinforced concrete beam and reinforced UHTCC beam,were manufactured.The corrosion process of the reinforcing bars was artificially accelerated,inducing different degrees of corrosions.The time when the first crack occurred was recorded and the beams with different corrosion ratios of ... |
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| Keywords: | ultra high toughness corrosion of reinforcing bar corrosion expansive cracking multiple cracking flexural test |
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