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Alternative Title:Expanded clay hot mix study.
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Abstract:This is part I of a two part final report on expanded clay hot mix to: (1) evaluate the use of various expanded clay bituminous mixtures under high traffic counts, (2) accumulate through experience testing, suitable information on the physical properties of the expanded clay aggregates and mixtures, for recommending adequate testing and control procedures on expanded clay mixtures, and (3) prepare a suitable expanded clay hot mix specification.
In order to evaluate expanded clay hot mix, four control sections, consisting of a standard Type 1 gravel hot mix, were constructed as a basis of comparison with sixteen expanded clay hot mix sections, varying in aggregate proportions, mineral filler, and asphalt content. The evaluation consisted of physical properties of expanded clay mixes at the plant, the laydown and compaction operation in the field, testing of roadway cores original and one year after construction, roughness, skid resistance and present serviceability index measurements on the roadway at various time intervals after completion and visual observation appearance of the roadway after being subjected to traffic.
Expanded clay hot mixes appear to be satisfactory for use in hot mix pavements. However, there are some problems to be considered when testing expanded clay mixes for their physical properties.
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