𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Experimental frost and salt weathering of chalk—II

✍ Scribed by L. C. Jerwood; D. A. Robinson; R. B. G. Williams

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
720 KB
Volume
15
Category
Article
ISSN
0360-1269

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✦ Synopsis

Experiments are described in which chalk cubes were soaked in solutions of either sodium chloride, sodium sulphate, or magnesium sulphate at concentrations of 5.5 per cent and 12.5 per cent, or in a mixed solution of sodium chloride and sodium sulphate or in distilled water. After removal of excess liquid, the cubes were subjected to six freeze-thaw cycles with temperatures ranging from either + 15 to -10°C or + 15 to -30°C. The results confirm that frost weathering can be enhanced by the presence of certain salts, but the extent of weathering was much less than that previously reported for samples frozen totally immersed in the same liquids. Evidence is presented which suggests that salt crystallization is the major weathering process operative when non-immersed samples are frozen but a combination of frost and salt weathering operates when fully immersed samples are frozen.

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