Abstract:
In recent years the use of emulsified asphalts in pavement mixtures has increased rapidly. This increased interest has been generated by the energy shortage. To date few papers have been published dealing specifically with the subject. This paper documents the methods used by Region 6 of the Forest Service. Problems, shortcomings, and needed research are also discussed. Standard methods of mix design such as Marshall and Hveem are reviewed, and it is concluded that they are usable only with major modification. The development and current state of Forest Service procedures are discussed. Adaptation and shortcomings of current structural design procedures are examined. Forest Service modifications of the AASHO interim guide are discussed. Development of reliable laboratory tests and equipment to evaluate the strength of emulsion mixes is recognized as a major research need. A Forest Service Proposal to solve the problem is discussed. The construction process is examined, and areas in which emulsion mix construction differs from that with cutback and hot asphalt cement mixes are discussed. Curing is a major problem with dense mixes, and runoff and mix viscosity are problems with open mixes. Needed research and the economics of emulsion pavements are discussed.
Supplemental Notes:
Proceedings of a work shop held June 16-19, 1975, in Boise, Idaho by the Transportation Research Board.
