The influence of petrophysical properties on the salt weathering of porous building rocks |
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| Authors: | D Benavente N Cueto J Martínez-Martínez M A García del Cura J C Cañaveras |
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| Institution: | (1) Departamento de Ciencias de la Tierra y del Medio Ambiente, Universidad de Alicante, Ap. 99, Alicante, 03080, Spain;(2) Laboratorio de Petrología Aplicada, Unidad Asociada CSIC-UA, Alicante, Spain;(3) Instituto de Geología Económica, CSIC-UCM, Madrid, Spain |
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| Abstract: | The influence of pore structure, water transport properties and rock strength on salt weathering is evaluated by means of
a thorough rock characterisation and a statistical analysis. The pore structure was described in terms of its porosity, pore
size distribution (quantified by mean pore radius) and specific surface area, density and water transport was characterised
by means of water permeability (saturated flow) and capillary imbibition (unsaturated flow); whilst the rock strength test
was carried out using uniaxial compressive strength, compressional and shear wave velocities, dynamic elastic constants and
waveform energy and attenuation were obtained from the digital analysis of the transmitted signal. A principal component analysis
and a stepwise multiple regression model was carried out in order to examine the direct relationships between salt weathering
and petrophysical properties. From the principal component analysis, two main components were obtained and assigned a petrophysical
meaning. The first component is mostly linked to mechanical properties, porosity and density whereas the second component
is associated with the water transport and pore structure. Salt weathering, quantified by the percentage of weight loss after
salt crystallisation, was included in both principal components, showing its dependence on their petrophysical properties.
The stepwise multiple regression analysis found that rock strength has a predominant statistical weight in the prediction
of salt weathering, with a minor contribution of water transport and pore structure parameters. |
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| Keywords: | Building stone Durability Permeability Petrophysics Pore structure Principal component analysis Rock strength Salt weathering |
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