...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials and structures >Temperature dependence of viscoelastic Poisson's ratio of cement mortar
【24h】

Temperature dependence of viscoelastic Poisson's ratio of cement mortar

机译：粘弹性泊松比例的水泥砂浆的温度依赖性

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

Concrete creep research has focused primarily on uniaxial response. However, biaxially prestressed concrete structures are common, resulting in a multiaxial stress state that can complicate the behavior of a viscoelastic material like concrete. Significant creep strains may be induced in directions transverse to each principle stress due to Poisson's effect. Past research is unclear regarding the viscoelastic or viscoplastic properties of concrete outside of uniaxial response. It has been reported in separate studies that concrete viscoelastic/viscoplastic Poisson's ratio (VPR) is an increasing, decreasing and constant function with time, with all reported measurements performed at room temperature. In this paper, the 3D basic creep response of mature cement mortar is examined using a confined compression experiment that allows direct determination of the full stress and infinitesimal strain tensors in a single test, which enables the determination of VPR under a multiaxial stress state. For this purpose, a unique, miniature version of the standardized concrete creep frame is designed that is amenable to placing in climate chambers and temperature ovens. The experimental results indicate that the VPR of sealed, mature cement mortar is nearly constant and equal to the elastic at room temperature, while the VPR gradually increases with time when measured at 60 degrees C.
机译：具体蠕变研究主要集中在单轴应答上。然而，双轴预应力的混凝土结构是常见的，导致多轴应力状态，可以使粘弹性材料如混凝土类似的复杂化。由于泊松效应，可以在横向于每个原理应力的方向上诱导显着的蠕变菌株。过去的研究不清楚，关于单轴反应外部混凝土的粘弹性或粘塑性能。据报道，在单独的研究中，混凝土粘弹性/粘性泊松比（VPR）是随时间的增加，减少和恒定的函数，所有报道的测量都在室温下进行。在本文中，使用狭窄的压缩实验检查成熟水泥砂浆的3D基本蠕变响应，其允许在单一测试中直接测定完全应力和无限菌株张量，这使得能够在多轴应力状态下确定VPR。为此目的，设计了标准化混凝土蠕变框架的独特微型版本，适用于放置气候室和温度烤箱。实验结果表明，密封的vpr，成熟的水泥砂浆几乎是恒定的并且在室温下的弹性等于弹性，而在60℃下测量时VPR逐渐增加。

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