Spatial characterization of salt accumulation in early stage limestone weathering using probe permeametry
Spatial characterization of salt accumulation in early stage limestone weathering using probe permeametry
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DOI：
10.1002/esp.2050
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发表时间：
2011-03-01
影响因子：
3.3
通讯作者：
Smith, B.
中科院分区：
文献类型：
--
作者：
Buj, O.;Gisbert, J.;Smith, B.
本研究利用非稳态便携式探针渗透仪对天然建筑石材的风化进行了表征。在盐风化模拟的早期阶段后，新鲜岩石和相同岩石的渗透性特性之间的变化被用来研究盐堆积对西班牙两种石灰石表面岩石渗透性特性空间变化的影响。Fraga和Tudela灰岩来自Ebro盆地，属于中新世。这两种类型的石头在西班牙的建筑遗产中都占有很大的地位，与许多其他建筑石灰石一样，它们很容易因孔隙空间中的盐结晶而受到物理损坏。为了检验在这一风化过程的早期阶段与盐积累相关的反馈，在实验室条件下，用浓度为5%和15%的硫酸镁和氯化钠模拟了这两种岩石的盐风化。利用储盐前后的渗透率填图和统计分析（空间统计和空间预测）来评估渗透率的空间变异性变化，并将这些变化与盐的运动、孔隙度变化、潜在的岩石劣化和结构特征联系起来。小规模渗透性测量的统计分析用于评估衰变的驱动因素，从而有助于预测两种石灰石的风化行为。版权所有John Wiley & Sons， Ltd。
This research characterizes the weathering of natural building stone using an unsteady-state portable probe permeameter. Variations between the permeability properties of fresh rock and the same rocks after the early stages of a salt weathering simulation are used to examine the effects of salt accumulation on spatial variations in surface rock permeability properties in two limestones from Spain. The Fraga and Tudela limestones are from the Ebro basin and are of Miocene age. Both stone types figure largely in the architectural heritage of Spain and, in common with many other building limestones, they are prone to physical damage from salt crystallization in pore spaces. To examine feedbacks associated with salt accumulation during the early stages of this weathering process, samples of the two stone types were subjected to simulated salt weathering under laboratory conditions using magnesium sulphate and sodium chloride at concentrations of 5% and 15%. Permeability mapping and statistical analysis (aspatial statistics and spatial prediction) before and after salt accumulation are used to assess changes in the spatial variability of permeability and to correlate these changes with salt movement, porosity change, potential rock deterioration and textural characteristics. Statistical analyses of small-scale permeability measurements are used to evaluate the drivers for decay and hence aid the prediction of the weathering behaviour of the two limestones. Copyright (C) 2010 John Wiley & Sons, Ltd.