The use of waste materials (air-cooled furnace slag and pyrolyzed carbon black) in hot mix asphalt
Abstract
The disposal of waste tires is a large environmental problem in the U.S. Reusing waste tires is preferable over disposing them. A possibility of reutilization is the use of crumb rubber from scrap tires in asphalt pavement. This was mandated by The Intermodal Surface Transportation Efficiency Act (ISTEA) of 1991. Another possible method to deal with waste tires in asphalt pavement is the use of pyrolyzed carbon black. The purpose of this paper is to characterize the fundamental properties and to evaluate the performance of asphalt mixtures modified by pyrolyzed carbon black (CB$\sb{\rm p}$) as an additive and air-cooled furnace slag as a coarse aggregate. Laboratory tests were conducted at INDOT and Koch Materials. The optimum binder content and the relationship of density and voids were determined from Marshall mix design. The range of the optimum binder content was 6.3% to 7.8%. The Marshall stability as a strength value and flow increased within the accepted ranges due to the inclusion of CB$\sb{\rm p}$. The gyratory tests were conducted by the US Army Corps of Engineers 8A/6B/4C model. The resilient modulus (M$\sb{\rm R}$) test and indirect tensile test were conducted to determine the stiffness of the mixtures at low temperatures which is related to the cracking potential of pavements. The inclusion of commercial CB and CB$\sb{\rm p}$ produced an increase of M$\sb{\rm R}$ and tensile strength. Dynamic confined creep tests were carried out to check the rutting potential of pavement at high temperature, which is one of the important problems for pavements. The mixtures modified by CB$\sb{\rm p}$ showed lower creep strain than the unmodified mixtures.
Degree
Ph.D.
Advisors
Salgado, Purdue University.
Subject Area
Civil engineering|Transportation|Materials science
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