• 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 >Building sandstone surface modification by biofilm and iron precipitation: emerging block-scale heterogeneity and system response
【24h】

Building sandstone surface modification by biofilm and iron precipitation: emerging block-scale heterogeneity and system response

机译：生物膜和铁的沉淀作用使建筑砂岩表面改性：新兴的块状异质性和系统响应

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

Stone surfaces are sensitive to their environment. This means that they will often respond to exposure conditions by manifesting a change in surface characteristics. Such changes can be more than simply aesthetic, creating surface/subsurface heterogeneity in stone at the block scale, promoting stress gradients to be set up as surface response to, for example, temperature fluctuations, can diverge from subsurface response. This paper reports preliminary experiments investigating the potential of biofilms and iron precipitation as surface-modifiers on stone, exploring the idea of block-scale surface-to-depth heterogeneity, and investigating how physical alteration in the surface and near-surface zone can have implications for subsurface response and potentially for long-term decay patterns. Salt weathering simulations on fresh and surface-modified stone suggest that even subtle surface modification can have significant implications for moisture uptake and retention, salt concentration and distribution from surface to depth, over the period of the experimental run. The accumulation of salt may increase the retention of moisture, by modifying vapour pressure differentials and the rate of evaporation. Temperature fluctuation experiments suggest that the presence of a biofilm can have an impact on energy transfer processes that occur at the stone surface (for example, buffering against temperature fluctuation), affecting surface-to-depth stress gradients. Ultimately, fresh and surface-modified blocks mask different kinds of system, which respond to inputs differently because of different storage mechanisms, encouraging divergent behaviour between fresh and surface-modified stone over time. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：石材表面对其环境敏感。这意味着它们通常会通过表现出表面特性的变化来应对暴露条件。这样的变化可能不仅仅是美学上的变化，而是在块级尺度上在石材中创建表面/地下异质性，促进应力梯度的建立，因为表面对例如温度波动的响应可能会与地下响应有所不同。本文报告了初步实验，这些实验研究了生物膜和铁沉淀物在石材上作为表面改性剂的潜力，探索了块状尺度的表层到深度异质性的概念，并研究了表层和近表层区域的物理变化如何产生影响。用于地下响应，并可能用于长期衰减模式。在新鲜和表面改性的石材上进行盐风化模拟表明，即使是细微的表面改性，在整个实验过程中，也会对水分的吸收和保持，盐分的浓度以及从表面到深度的分布产生重大影响。盐的积聚可通过改变蒸气压差和蒸发速率来增加水分的保留。温度波动实验表明，生物膜的存在会影响石材表面发生的能量转移过程（例如，缓冲温度波动），从而影响表面到深度的应力梯度。最终，新鲜的和表面改性的石材掩盖了不同类型的系统，由于存储机制不同，它们对输入的反应也不同，随着时间的推移，鼓励了新鲜的和表面改性的石材之间的差异行为。版权所有（c）2014 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