Crumb Rubber rubber-modified bitumen ( CRMB ) is considered to provide a prolonged life of enhanced pavement performance. Crumb Rubber rubber-modified bitumen ( CRMB ) is a hydrogen binder obtained through the physical and chemical interaction of crumb rubber with bitumen and some specific additives. It is designed to maximize resistance to permanent deformation and reduce fatigue of asphalt mixtures that are used in most of the most demanding locations.