• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >An experimental investigation into the behavior of concrete elements rerofitted with NSM composite strips at elevated temperatures.
【24h】

An experimental investigation into the behavior of concrete elements rerofitted with NSM composite strips at elevated temperatures.

机译：NSM复合材料条在高温下改型的混凝土构件性能的实验研究。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Near-surface-mounted (NSM) fiber reinforced polymer (FRP) is another strengthening alternative of externally bonded fiber reinforced polymers. NSM FRP is a promising alternative technology that has emerged for enhancing the strength capacity of concrete structures. Most laboratory researches have focused mainly on the overall member performance and/or the bonding performance of the NSM bars or strips. Limited research has focused on the effect of temperature exposure on NSM FRP performance. The results of an experimental program performed on forty-eight (48) concrete block specimen with NSM carbon-fiber reinforced polymer (CFRP) strengthening systems at elevated temperatures that reaches to 200°C [392°F] to investigate flexural performance. The effect of using two different adhesive systems (epoxy anchoring system) with manufacturer recommendation at ordinary and high temperature exposures is also studied. The adhesive was injected in a NSM groove size (25 mm [1 in] deep x 13 mm [0.5 in] wide) the width and depth of the groove were greater than 3 and 1.5 times the CFRP thickness and width, respectively. Test results show that the interfacial strength of the specimens bonded with the ordinary epoxy is maintained until 75°C [167°F] is reached, while the strength noticeably decreases with an increasing temperature above this limit. The specimens with the high-temperature epoxy preserve interfacial capacity up to 200°C [392°F] despite a trend of strength-decrease being observed. The failure of the test specimens is brittle irrespective of adhesive type. Interfacial damage is localized along the bond-line with the presence of hairline cracks that further develop when interfacial failure is imminent.;This thesis also presents an experimental result concerning the bond performance of concrete-adhesive at elevated temperatures that reaches to 200°C [392°F] applied for three hours. Then, the concrete prisms were tested under three point flexural loading. The experimental program is comprised of seventy-two (72) specimens bonded with low viscosity, high viscosity adhesives and high-temperature adhesive and their comparative performance is of interest in the present investigation. Emphasis is placed on the residual capacity of the conditioned bond-concrete interface and corresponding failure mode. For high temperature exposure, it is shown that the high temperature laminated adhesive outperforms the high and low viscosity adhesives by remaining fairly consistent and allowing the strengthening system to remain effective for up to three hours of 200°C [392°F].
机译：近表面安装（NSM）纤维增强聚合物（FRP）是外部粘合的纤维增强聚合物的另一种增强选择。 NSM FRP是一种有前途的替代技术，已出现，可以增强混凝土结构的强度。大多数实验室研究主要集中在NSM条或条的整体构件性能和/或粘合性能上。有限的研究集中在温度暴露对NSM FRP性能的影响上。对四十八（48）个带有NSM碳纤维增强聚合物（CFRP）增强系统的混凝土砌块试样进行的实验程序结果，在高达200°C [392°F]的高温下进行，以研究挠曲性能。还研究了在正常和高温下使用两种不同胶粘剂系统（环氧锚固系统）并得到制造商建议的效果。粘合剂以NSM沟槽尺寸（深25毫米[1英寸] x 13毫米[0.5英寸]宽度）注入，沟槽的宽度和深度分别大于CFRP厚度和宽度的3倍和1.5倍。测试结果表明，与普通环氧树脂粘合的试样的界面强度一直保持到达到75°C [167°F]时，而强度却随着温度的升高而明显降低。尽管观察到强度降低的趋势，但使用高温环氧树脂的样品仍能保持高达200°C [392°F]的界面容量。无论粘合剂类型如何，试样的破坏都是脆性的。界面损伤沿粘结线局部分布，并在即将发生界面破坏时出现细线裂纹。该论文还提出了关于混凝土胶粘剂在高达200°C的高温下的粘结性能的实验结果[ 392°F]施加了三个小时。然后，在三点弯曲载荷下测试混凝土棱镜。该实验程序由用低粘度，高粘度胶粘剂和高温胶粘剂粘合的七十二（72）个样品组成，它们的比较性能在本研究中受到关注。重点放在条件粘结混凝土界面的剩余容量和相应的失效模式上。对于高温暴露，结果表明，高温层压胶粘剂通过保持相当稳定的性能并使增强体系在200°C [392°F]的三个小时内保持有效，从而胜过高粘度和低粘度胶粘剂。

著录项

  • 作者

    Namrou, Abdul Rahman.;

  • 作者单位

    University of Colorado at Denver.;

  • 授予单位 University of Colorado at Denver.;
  • 学科 Engineering Civil.;Applied Mechanics.;Engineering Materials Science.
  • 学位 M.S.
  • 年度 2013
  • 页码 183 p.
  • 总页数 183
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 石油、天然气工业;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号