The concrete qualities C30/37 LP and C35/45 LP are air-entrained concrete. Depending on the assigned exposure class, concrete may have to be produced as air-entrained concrete. Concrete of the exposure class XF4 must be produced as air-entrained concrete. The class XF4 is assigned to, e.g. traffic surfaces treated with de-icing salt, predominantly horizontal components in the splash zone of traffic surfaces treated with de-icing salt, concrete safety barriers, scraper tracks of sewage treatment plants and seawater components in the maritime splash zone. Since manhole covers with concrete collar are often used on roads, thus being considerably affected by the freeze-thaw cycle, it is generally recommended to use air-entrained concrete.
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