...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Sandstone response to salt weathering following simulated fire damage: a comparison of the effects of furnace heating and fire
【24h】

Sandstone response to salt weathering following simulated fire damage: a comparison of the effects of furnace heating and fire

机译：模拟火灾造成的砂岩对盐分风化的响应：炉子加热和火灾影响的比较

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

Fire has long been recognized as an agent of rock weathering. Our understanding of the impact of fire on stone comes either from early anecdotal evidence, or from more recent laboratory simulation studies, using furnaces to simulate the effects of fire. This paper suggests that knowledge derived from simulated heating experiments is based on the preconceptions of the experiment designer - when using a furnace to simulate fire, the operator decides on the maximum temperature and the duration of the experiment. These are key factors in determining the response of the stone to fire, and if these are removed from real-world observations then knowledge based on these simulations must be questioned. To explore the differences between heating sandstone in a furnace and a real fire, sample blocks of Peakmoor Sandstone were subjected to different stress histories in combination (lime rendering and removal, furnace heating or fire, frost and salt weathering). Block response to furnace heating and fire is discussed, with emphasis placed on the non-uniformity of the fire and of block response to fire in contrast to the uniform response to surface heating in a furnace. Subsequent response to salt weathering (by a 10% solution of sodium chloride and magnesium sulphate) was then monitored by weight loss. Blocks that had experienced fire showed a more unpredictable response to salt weathering than those that had undergone furnace heating - spalling of corners and rapid catastrophic weight loss were evidenced in blocks that had been subjected to fire, after periods of relative quiescence. An important physical side-effect of the fire was soot accumulation, which created a waxy, relatively impermeable layer on some blocks. This layer repelled water and hindered salt ingress, but eventually detached when salt, able to enter the substrate through more permeable areas, concentrated and crystallized behind it, resulting in rapid weight loss and accelerated decay. Copyright (C) 2007 John Wiley & Sons, Ltd.
机译：长期以来，人们一直认为火是岩石风化的推动因素。我们对火对石头的影响的了解来自早期的轶事证据，或者来自最近的实验室模拟研究，使用炉子模拟火的影响。本文认为，从模拟加热实验中获得的知识是基于实验设计者的观念的-当使用熔炉模拟火时，操作员将决定最高温度和实验持续时间。这些是确定石头对火的反应的关键因素，如果将它们从现实世界的观察中删除，则必须质疑基于这些模拟的知识。为了探索加热炉中的砂岩与真实火之间的差异，对Peakmoor砂岩的样品块进行了不同的应力历史组合（石灰渲染和去除，加热炉或火，霜和盐风化）。讨论了对炉子加热和着火的块响应，着重于火的不均匀性和对火的块响应，而不是对炉子对表面加热的均匀响应。然后通过失重监测对盐风化的后续响应（通过氯化钠和硫酸镁的10％溶液）。经历过火灾的砖块比经过炉子加热的那些砖块对盐分的风化表现出更加难以预测的反应-在经过相对静止的一段时间后，经历过火灾的砖块被证明发生了角剥落和快速的灾难性重量损失。火灾的一个重要的物理副作用是烟灰积累，这在某些砖块上形成了一层蜡状的，相对不可渗透的层。该层排斥水并阻止盐分进入，但最终在盐分脱离时，能够通过更具渗透性的区域进入基材，在其后面浓缩并结晶，从而导致重量迅速减轻和衰变加快。版权所有（C）2007 John Wiley＆Sons，Ltd.

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