Over the last 20 years increasing use has been made in Sweden and Norway of steel piling for the foundations of buildings on bedrock. Where bedrock is encountered at a comparatively low level, steel often represents the cheapest means of obtaining a secure foundation, but the use of steel piling is still restricted because of the uncertainties of the corrosion effect. If the foundations are to be safe for a period of about 150 years, the corrosion rate must not exceed 1/50 mm. p.a.
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