Viscosity in hot mix construction.
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Viscosity in hot mix construction.

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      Viscosity, one of the oldest known and tested properties of Asphalt, yet one of the least studied is recently being given the attention it so rightfully deserves. Numerous engineers did recognize the importance of this property to the extent that several papers and magazine articles were written on the subject. Some of these pertaining to viscosity, only, indirectly, as the discussions were based on the effects of temperature in bituminous construction. The Asphalt institute, in 1958, recommended specific limits for viscosity to which the asphalts should be heated in order to achieve proper mixing. This certainly was one of the major achievements in hot mix construction.

      Louisiana Department of Highways has been investigating the effects of viscosity of asphalts at several stages of construction on test results and performance of hot mix asphatlic concrete pavements in 1957. The information obtained so far, by no means is conclusive. However, the indications are that he degree of fluidity of the asphalt plays on important part during mixing and compaction of asphaltic concrete.

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