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Compaction of Asphalt Concrete Pavements
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1969-07-01
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[PDF-3.83 MB]
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Abstract:The importance of proper compaction of asphalt pavements has been recognized for many years. Investigators have shown that pavement stability, durability, tensile strength, fatigue resistance, stiffness, and flexibility are controlled to a certain degree by the density of asphalt concrete. To ensure adequate compaction several agencies specify "in-place" density requirements. These in-place requirements are commonly expressed as a percent of a standard laboratory compaction density. 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 asphalt concrete pavements in Texas as well as other states are not stabilizing at a density equal to that obtained in the laboratory design of a companion paving mixture. The reasons for this unpredictable behavior are probably many and complex. In an attempt to define more adequately the variables that may affect the long-term density of a pavement, fifteen test sites were selected throughout the state of Texas, and compaction data were collected over a three-year span, covering a maximum life span of two years for any individual pavement. The results of this study are presented herein.
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