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Cement Coating Marginal Aggregates for Use in Asphalt Pavements
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1992-11-01
[PDF-5.27 MB]
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Edition:September, 1990 Final -August, 1992
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Abstract:Laboratory experiments were conducted to determine the feasibility and effects of applying a coating of portland cement paste to marginal aggregates and curing prior to use in hot mixed asphalt concrete. Aggregates ranging in size from fine sand to one-inch rock were separately coated with cement, cured, and then blended to produce the desired mixture design. Laboratory specimens were prepared and tested. Tests included Hveem and Marshall stability, resilient modulus as a function of temperature, indirect tension, moisture susceptibility, creep, and permanent deformation. 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. No other mixture properties were consistently improved. Abrasion during mixing and compaction of the laboratory specimens removed a significant portion of the cement coating. 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% of the cement coating was removed from the aggregates during routine handling of the aggregates and plant mixing operations.
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