United States Department of Transportation
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Abstract:Shifting the sampling site of asphalt concrete from the plant to the roadway necessitates a modification of the Marshall procedure. The effect of such as modification on the Marshall properties and resultant process levels in a Satistically Oriented End-Result Sepcification requires a feasibility determination. The variation associated with a modified test procedure was examined in this study.
Loose mix samples from the roadway were secured from the same trucks sampled at the plant in four districts, which represented two mix types (low and high stability) and four different asphalt cement sources. These materials were tested at the district laboratories in duplicate and at the research laboratory where samples were compacted similarly to the district, by a means of compaction different from the district, and at a reduced compaction temperature. Marshall briquettes were tested and the Marshall properties were analyzed using standard statistical procedures.
It was found that the Marshall properties' statistical parameters of mean levels and variation were significantly different from the parameters basic to the current specifications. These differences create new process levels which would demand a revision of specifications upon implementation of the modified test procedure. In general, the data demonstrates within lab and between lab repeatability. Also, that manual and automatic compaction harmers will provide significantly different results.
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