Many of Ontario's freeway surfaces are showing signs of premature superficial deterioration in the form of map cracking, ravelling, and coarse aggregate loss associated with the use of 100% steel slag coarse and fine aggregates in the hot mix wearing course. The majority of these freeways will require rehabilitation within the next few years. In 1991, the Ontario Ministry of Transportation undertook two demonstration projects to determine if micro-surfacing would extend the life of freeways exhibiting this type of premature superficial deterioration. This paper describes the design, testing procedures, material characteristics, construction, and short term performance of the of the micro-surfacing systems placed. It also discusses the viability of micro-surfacing as a superficial rehabilitation treatment under freeway conditions. (A)
Samenvatting