Complex relationships between salt type and rock properties in a durability experiment of multiple salt–rock treatments

Abstract

A laboratory salt weathering experiment was performed using fi ve salts to attack eight types of rocks to determine the relative signifi cance of rock durability and salt aggressivity to salt crystallization damage. The infl uence of individual rock properties on the salt susceptibility of the rocks was also evaluated. To study the relation between pore characteristics, salt uptake, and damage, the pre-and post-experiment pore size distributions of the rocks were also examined. It is observed that both salt type and rock properties infl uenced the damage pattern. The durability ranking of the rocks became signifi cantly altered with the salt type while the variation in salt effi cacy ranking with rock type was less pronounced. Of the fi ve salts used, sodium chloride and aluminium sulfate were invariably ineffective with all rock types while sodium carbonate, sodium sulfate, and magnesium sulfate, were markedly more effective in damaging most types of rock used. Of the rock properties investigated, the microporosity (of pores smaller than 0·05 or 0·1 µm) showed the most signifi cant infl uence on deterioration of the rocks associated with salt crystallization, whereas microporosity of pores smaller than 5 µm played a more important role in salt uptake. Pore size distribution was thus the key factor controlling salt uptake and damage. Rocks with a large number of pores (<5 µm) and a high proportion of pores (<0·05 or 0·1 µm) were particularly susceptible to salt crystallization damage. However, anomalies arose that could not be explained in terms of rock properties or salt effi cacy alone. Overall, the relative infl uences of salt type/effi cacy and rock type/ properties on salt damage propensity were not clear enough to draw a reasonable conclusion. Salt crystallization damage appears to be infl uenced by the individual interactions between salts and rocks, which could explain the anomalous results.

Rock warming and drying under simulated intertidal conditions, part II: weathering and biological influences on evaporative cooling and near‐surface micro‐climatic conditions as an example of biogeomorphic ecosystem engineering

“…field‐exposed) concrete may therefore be indicative of an increased frequency of salt crystallization in this material type (e.g. Yu and Oguchi, ; Liu et al , ). In contrast, the retention of moisture and buffering of thermal extremes through bioerosion may reduce the efficiency of salt weathering in limestone compared to uncolonized rock (e.g.…”

Quantification of rock control in geomorphology

“…Even more remarkably, Yu and Oguchi (2009) found that the relative resistance of a range of rock types to salt weathering was variable, and that the ranking of durability varied with the type of salt employed.…”

Environmental Factors of Seasonal Changes in Salt Efflorescence Observed on Building Stones Used at Orval Abbey, Southern Belgium

“…究がなされてきた (Matsukura and Matsuoka, 1996; Goudie and Viles, 1997) 。松倉 2008 (Gauri, 1990;Winkler, 1994;朽津, 1994;Kuchitsu et al, 1999 (Matsukura and Matsuoka, 1996;Goudie and Viles, 1997;山田ほか, 2005;Osawa and Oguchi, 2009; Swe Yu and Oguchi, 2009 (Matsukura and Matsuoka, 1996) 指摘されている (Matsukura et al, 2004;松倉, 2008) 。また，湿度については，大気の相対湿度…”