...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials and structures >Multiaxial restraint of steel fibres in ASR-affected fibre reinforced concrete
【24h】

Multiaxial restraint of steel fibres in ASR-affected fibre reinforced concrete

机译：ASR受影响纤维混凝土中钢纤维的多轴约束

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Several studies have investigated approaches to prevent and mitigate the damage of concrete structures due to alkali-silica reaction (ASR). Owing to the ability of fibres to control crack propagation and transmit tensile stresses across cracks, fibre reinforced concrete appears to be a possible alternative approach to mitigate the damage due to ASR. However, the multiaxial restraint provided by fibres and its effectiveness in reducing the ASR damage in concrete has not been adequately understood. This study performs accelerated testing of prism and cylinder specimens made with alkali-silica reactive concrete and having steel fibres with volume fractions of 0, 0.65 and 1.3%. Two variations of prism specimens, with and without a central reinforcing rod, are measured for triaxial expansion. This study demonstrates that even though fibres or the rod can reduce longitudinal expansion, they may not restrain the ASR expansion volumetrically. Moreover, this study proposes a unified approach for defining the restraining effect of fibre and rod reinforcement in terms of stress. The extent of cracking is examined by using the damage rating index method, and the confinement provided by steel fibres is demonstrated through optical microscopy. The effect of steel fibres in reducing the degradation of mechanical properties is assessed by testing the compressive strength, flexural strength and modulus of elasticity of concrete. While 0.65% fibre volume fraction is inadequate, 1.3% fibre volume fraction is effective in reducing cracking and degradation of modulus of elasticity and in completely offsetting the ASR degradation of modulus of rupture.
机译：有几项研究已经研究了防止和减轻由于碱二氧化硅反应（ASR）损伤混凝土结构损伤的方法。由于纤维控制裂纹传播和横跨裂缝的拉伸应力，纤维增强混凝土似乎是可能的替代方法，以减轻由于ASR引起的损坏。然而，纤维提供的多轴约束及其在减少混凝土中减少ASR损坏的有效性尚未得到充分理解。该研究表现了用碱 - 二氧化硅反应混凝土制成的棱镜和气缸样品的加速测试，并具有0，0.65和1.3％的体积分数的钢纤维。测量三轴膨胀的棱镜样品的两种棱镜样品的变化。本研究表明，即使纤维或杆可以降低纵向膨胀，它们也可能不会大大限制ASR膨胀。此外，该研究提出了一种统一的方法，用于在应力方面定义纤维和杆增强件的抑制效果。通过使用损伤评级指数方法检查破裂程度，通过光学显微镜证明钢纤维提供的限制。通过测试混凝土的抗压强度，弯曲强度和弹性模量来评估钢纤维在降低机械性能劣化的影响。虽然0.65％纤维体积分数不足，1.3％纤维体积分数可有效降低弹性模量的裂化和降解，并且完全抵消破裂模量的劣化。

著录项

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