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Asphalt emulsions are not new materials, they have been used for over 80 years to seal roads. In many countries large scale road construction programs have, and are being carried out. These are more often than not with aid or World Bank funds. This investment in road infrastructure has brought with it the challenge of maintaining these roads, particularly in rural and remote areas. This paper discusses the development of maintenance programs around emulsion use. It discusses the various applications and illustrates the simple manufacture of emulsions, formulation considerations and the applications of emulsions in road maintenance. Asphalt emulsions are sophisticated products, however the technology for manufacture and application can be codified and simplified to allow application from simple patching to full scale surfacing projects. For the covering abstract of this conference see IRRD number 872978.
The project was designed to determine if emulsified asphalts would perform as well as cut-back asphalts in similar applications. The benefits of emulsified asphalts are primarily derived from the lower temperature requirements and occasionally a lesser amount of actual asphalt content. The project was undertaken in two phases; Phase I--Tack Coats and Phase II--Seal Coats for Surface Treatments. The application of the tack coats in Phase I and the surface treatments in Phase II followed generally the rates that are commonly used in the maintenance operations. Three different types of surface treatments were used; seal coat with sand using anionic emulsion, a chip seal with a sand cover using cationic emulsion and a hot maintenance mix. All of these treatments were placed over areas previously treated with hot maintenance mix in 1974.
Emulsions and Emulsion Stability, Second Edition provides comprehensive coverage of both theoretical and practical aspects of emulsions. The book presents fundamental concepts and processes in emulsified systems, such as flocculation, coalescence, stability, precipitation, deposition, and the evolution of droplet size distribution. The bo