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Six overlay test sections were placed on an existing test road in Hanover, New Hampshire, to gain experience in compaction of asphalt pavements at rolling temperatures as low as 150 F. The asphalt cement and aggregated used had mix characteristics similar to those of the mix expected to be used for a proposed overlay project at Thule Air Base, Greenland. Results of the overlay tests showed that computer-modeled cooling curves can be accurate predictors of the actual asphalt overlay cooling with time. In addition, the effects of temperature upon compaction were determined and its was found that nuclear gauges, when used and calibrated properly, successfully monitored mix density changes during compaction. (Author).
In recent years there has been a trend toward operating asphalt plants at lower mixing temperatures. These lower temperatures result primarily from a desire to conserve the energy required to produce the mixtures. The most direct result of lower mixing temperatures is lower temperatures during compaction. The effect of these lower compaction temperatures on performance has not been established, but laboratory studies have led to some questions that need to be addressed. The purpose of this paper is to summarize the results of a field and laboratory study performed at The University of Texas at Austin, Center for Transportation Research, to analyze the effect of lower compaction temperatures on the engineering properties of asphalt concrete mixtures.
The Hamburg wheel-tracking device can be used to predict the moisture susceptibility of a hot mix asphalt (HMA) pavement. This report shows how the test results are influenced by compaction temperature and anti-stripping treatment. The higher the compaction temperature, the better the results in the Hamburg wheel-tracking device. The use of hydrated lime and liquid anti-stripping additives improved the results in the Hamburg wheel-tracking device over HMAs that were not treated. Hydrated lime dramatically improved the HMAs that were not treated. Liquid anti-stripping additives improved some of the HMAs dramatically while other HMAs were only improved slightly.