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Interim Report on the Influence of Design, Construction and Traffic on Compaction of Hot-Mix Asphaltic Concrete
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1967-07-01
[PDF-1.36 MB]
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Abstract:The density of the various layers of a flexible pavement system has always been a problem to highway engineers. The "in place" density requirement is a specification item for most highway foundation work, but the surface layer of asphaltic concrete may not be subject to such requirements. In Texas, the most common specification for asphaltic concrete does not have an "in place" or "field" density requirement; however, job control samples are made in the laboratory, and these samples must conform to certain specifications requirements. These laboratory tests are intended to give the engineer needed information about the density of the surfacing material as it ultimately appears on the roadway. However, there is evidence that an increasing number of asphaltic concrete pavements in Texas are reaching higher densities than those obtained in the laboratory design of the paving mixture; and others are far below the design density. Some of the primary considerations in the rate and amount of densification of a surface course are: 1. Composition and characteristics of the paving mixture; 2. Construction features (time of year and amount of rolling); and 3. Deflection of the pavement structure. Hence, it is deemed desirable to examine the influence of the above variables of pavement densification and to try to correlate the laboratory and field compactibility of different paving mixtures throughout Texas. This study will also attempt to determine a recommended optimum field density to be obtained during construction.
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