The practice of incorporating certain waste products into highway construction and repair materials (CRMs) has become more popular. These practices have prompted the National Academy of Science, National Cooperative Highway Research Program (NCHRP) to research the possible impacts of these CRMs on the quality of surface and ground waters. State department of transportations (DOTs) are currently experimenting with use of ground tire rubber ( crumb rubber) in bituminous construction and as a crack sealer. Crumb rubber asphalt concrete (CR-AC) leachates contain a mixture of organic and metallic contaminants. Benzothiazole and 2(3H)-benzothiazolone (organic compounds used in tire rubber manufacturing) and the metals mercury and aluminum were leached in potentially harmful concentrations (exceeding toxic concentrations for aquatic toxicity tests). CR-AC leachate exhibited moderate to high toxicity for algae ( Selenastrum capriconutum) and moderate toxicity for water fleas ( Daphnia magna). Benzothiazole was readily removed from CR-AC leachate by the environmental processes of soil sorption, volatilization, and biodegradation. Metals, which do not volatilize or photochemically or biologically degrade, were removed from the leachate by soil sorption. Contaminants from CR-AC leachates are thus degraded or retarded in their transport through nearby soils and ground waters.
Environmental impact of highway construction and repair materials on surface and ground waters: Case study. Crumb rubber asphalt concrete
Waste Management ; 23 , 8 ; 719-728
2003
10 Seiten, 42 Quellen
Aufsatz (Zeitschrift)
Englisch
Babbitt, Minnesota: Case Study of Pretreated Crumb Rubber Modified Asphalt Concrete
Online Contents | 1996
|Babbitt, Minnesota: Case Study of Pretreated Crumb Rubber Modified Asphalt Concrete
Transportation Research Record | 1996
|Babbitt, Minnesota: Case Study of Pretreated Crumb Rubber Modified Asphalt Concrete
Transportation Research Record | 1996
|Characteristics of crumb rubber modified (CRM) asphalt concrete
Springer Verlag | 2001
|Feasibility of Crumb Rubber Use for Asphalt Pavement Construction
Transportation Research Record | 1996
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