Investigation of the Design and Control of Asphalt Paving Mixtures. Volume 1.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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In general, asphalt pavements have been constructed by following certain rules and specifications which have proven to be satisfactory over a long period of time. Such specifications closely control the gradation limits, the character of the filler and aggregate, and may specify the required per cent of the theoretical maximum density a pavement must possess. The amount of asphalt to be combined with the aggregate was usually determined roughly by an empirical formula and was adjusted by the engineer in charge at the time of construction as his expert experience might indicate. Such a procedure is in general satisfactory where wheel loads are constant and where engineers having long experience with local materials are available to supervise pavement construction. During World War II a different situation developed. Airport pavements were designed and constructed to carry wheel loads many times greater than those being carried by highways or city streets. Also, the construction was usually supervised by men not familiar with the aggregates locally available. Since simultaneous construction was in progress on a large scale at many locations, it was not possible to have expert experienced supervision on all projects at all times. The need for a simple method whereby an asphalt mixture could be designed and controlled during construction with confidence that it would be satisfactory for heavy airplane wheel loads when completed was apparent. The investigation herein presented was conducted to meet this need. Author
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