Abstract: The tests were performed on mineral recycled base mixes with foamed bitumen, in which the material from the existing layers was used. The bitumen binder was added to the recycled material in the amount of 2,0% to 3,5%, and hydraulic binder (cement) of 1,0% to 2,5% with changes every 0,5% at variable. The measurements of resistance to the effects of water and frost according to the AASHTO T283 method and the resistance to low temperature cracking according to the PANK 4302 methods confirmed that used foamed bitumen in the cold recycling technology is resistant to these climatic factors. The results obtained were subjected to the optimization process, which allowed to state that with the application of 2,5% foamed bitumen and 2,0% of cement the base course has the required mechanical properties as well as water and frost resistance according to the applied criteria.
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