Hot Mix Asphalt Containing Nickel Slag Aggregate – Laboratory Evaluation for its Use in Highway Construction

摘要

Air-cooled nickel slag is evaluated for highway construction applications as an aggregatein hot mix asphalt. The air-cooled nickel slag is a liquid co-product of nickel production that issolidified under ambient conditions. The laboratory evaluation program carried out to determinethe characteristics of the air-cooled nickel slag, included physical and mechanical propertiestesting, petrographic examinations; hot-mix asphalt mixture designs. Accelerated laboratorytesting was completed on the hot mix mixtures using asphalt pavement analyzer to assess theirperformance characteristics. Additional testing includes autoclave disruption tests for free limeand free magnesia, and chemical/mineralogical analyses, polished stoned value (PSV) andaggregate abrasion value (AAV). This study indicated that suitably processed nickel slag isenvironmentally, mineralogically and physically stable. From the accelerated laboratory testingcompleted, it is concluded that the air-cooled nickel slag is suitable for use as coarse and fineaggregates in hot mix asphalt. The utilization of nickel slag in a highway construction is alsopresented.