World salinization with emphasis on Australia

  • Rengasamy P
  • Fujimaki H
  • Shimano T
 et al. 
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Sea salt damage to porous building materials is a well-known problem not only in regions located near the sea but also in continental areas. In walls, sea salts may stem from different sources: they may penetrate from the ground by rising damp, maybe carried by the wind in the form of salt spray, may be due to flooding, occasional or recurrent, or may also be caused by the use of sea water in the preparation of the mortar. Although accelerated crystallization tests performed in laboratory on building materials usually show that sea salts (sodium chloride) are less harmful to masonry than, for example, sodium sulfate, in reality they may cause serious damage. Different decay patterns of sea salt weathering can be found for different sources and conditions. This is shown for a building, with various sources of sea salts present in the same masonry wall: the church of Domburg, located in a coastal area of Zeeland (The Netherlands). According to the sea salt origin a 'rising damp zone' showing brick blistering and a 'sea spray zone' affected by powdering of the brick can be identified at different height from the ground level. In the first case the effect of sodium chloride is indirect, as the blistering is a result of catalyst effects of sodium chloride on gypsum formation. In the latter case the effect of sodium chloride is direct, as the powdering of the bricks may be caused by a combination of crystallization, differential thermal expansion and hydration. The paper reports the investigation of the two damage mechanisms in which several complementary test techniques were applied: moisture and hygroscopic moisture measurements, ion chromatography, XRD, petrographical analyses and mercury porosimetry. All of them have contributed to provide a complete and clear definition of the different decay mechanisms in relation to the sea salts and moisture sources. © 2003 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Australia
  • Bare soil evaporation
  • Capillary flow
  • Case study
  • Coupling effects
  • Crystallization pressure
  • Decay mechanisms
  • Desertification
  • Dry-land salinity
  • Dryland salinity
  • Dual-permeability models
  • Dual-porosity models
  • ECa
  • Ecohydrology
  • Electromagnetic induction
  • Eolian transport
  • Ettringite
  • Evaporation
  • Evaporation front
  • Feedbacks
  • Fickian diffusion
  • Groundwater
  • Hydrated minerals
  • Invariant point
  • Irrigation salinity
  • Laboratory analyses
  • Land degradation
  • Liquid and vapour flow
  • Maize grain yield
  • Management zone
  • Masonry
  • Mathematical model
  • Multiphase reactive transport
  • Non-equilibrium flow
  • Overgrazing
  • Partial root-zone drying
  • Pedon scale
  • Plant-based solutions
  • Pollutant deposition
  • Polluted ground water
  • Precision agriculture
  • Preferential flow
  • Risk prediction
  • Root-zone constraints
  • Salinisation
  • Salinity
  • Salinity in Australia
  • San Joaquin Valley
  • Sea salts
  • Sensors
  • Sodicity
  • Sodium sulfate
  • Soil
  • Soil evaporation
  • Soil processes affecting salinity effects
  • Soil quality
  • Soil salinity
  • Soil water balance components
  • Solute transport
  • Spatial heterogeneity
  • Supersaturation
  • Transient salinity
  • Vadose zone
  • Vertical pollutant redistribution
  • Water repartition
  • World salinization
  • X-ray tomography
  • computed tomography (CT)
  • crystallization pressure
  • discharge lakes
  • dispersive soils
  • diurnal dynamics
  • doi:10.102
  • doi:10.1029/2009WR008999
  • doi:10.1029/2010WR009677
  • doi:10.1029/9
  • drying
  • dual-permeability dual-porosity flow models non-eq
  • dune environments
  • environmental conditions
  • evaporation
  • evaporation from porous media
  • grain angularity
  • halophytic plant
  • heterogeneity
  • hyperion
  • porous media
  • remote sensing
  • saline soils
  • salinity
  • salinity index
  • salinization
  • salt precipitation
  • salt weathering
  • semiarid climate
  • sodium chloride
  • sodium sulphate
  • soil chemistry
  • soil physical conditions
  • soil salinity
  • soil salinity index
  • solute transport
  • spectral response
  • spectroradiometer
  • stone decay

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  • Pichu Rengasamy

  • Haruyuki Fujimaki

  • Takahiro Shimano

  • Mitsuhiro Inoue

  • Kazurou Nakane

  • J. W. Gowing

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