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Abstract. The asphalt rubber wet process is a practical means of providing environmental, economic, sustainable, and safety of using crumb rubber from recycled tires using the wet method technology widely used in societal benefits. New imaginative and innovative engineering technology concepts have led to the development of a new asphalt rubber, crumb rubber semi wet method material with reacted and activated rubber (RAR). The RAR semi-wet process has demonstrated a product capable of matching and surpassing the performance of traditional hot mix asphalt and the traditional asphalt rubber, crumb rubber method asphalt. The RAR dry filler when it meets hot asphalt amalgamates in such a way as to become like the traditional crumb rubber method asphalt rubber. The RAR is superior to the traditional asphalt rubber, crumb rubber method since it can be used at higher percentages. This paper introduces the concept and some experiences of using a RAR binder in asphalt thin gap mixtures applied with or without an RAR stress absorbing membrane interlayer (SAMI). The paper presents how the added flexible fatigue cracking resistance of these mixes leads to great environmental benefits. It introduces key concepts that can be the basis of specifications that can be used by road departments to ensure, not only that the crumb rubber is properly reacted and treated, but that the mixes have adequate bitumen and RAR to satisfy flexural/reflective fatigue cracking resistance.
