Cement Coating Marginal Aggregates for Use in Asphalt Pavements

摘要

Laboratory experiments were conducted to determine the feasibility and effects ofapplying a coating of portland cement paste to marginal aggregates and curing prior to use in hot mixed asphalt concrete. Laboratory test results showed that asphalt mixtures made using coated aggregate exhibited higher Hveem stability and lower creep compliance than similar uncoated mixtures. This is indicative that the cement coating process will decrease the rutting potential of asphalt mixtures made with marginal aggregates. Full-scale cement coating tests were successfully performed in the field. Test pavements using similar uncoated and coated aggregates were constructed. It was determined that approximately 95 percent of the cement coating was removed from the aggregates during routine handling of the aggregates and plant mixing operations.