As part of a study to develop standard design procedures and specifications for cold in-place recycling of asphalt pavements, a literature review and a survey of state and local highway agencies and contractors were performed. The results indicate a diversity of cold in-place recycling use, design, and construction. Cold in-place construction can be divided into three distinct types: (a) a stabilization process, (b) a single unit miller or mixer process, and (c) a process using full construction trains. Several promising recycling agents have been identified and some guidelines for compaction and curing have been developed. Specific mix design procedures and structural design show great variation among users, however, and no single method can be recommended. Cold in-place recycling construction involves milling or pulverizing the existing pavement, reduction in size, mixing, laydown, and compaction. Most agencies then apply a fog seal, surface treatment, or thin overlay as a wearing surface. Overall, cold in-place recycling has shown satisfactory performance and considerable cost savings over conventional overlays. Further evaluation of procedures, specifications, and performance is recommended, however, to standardize this practice.
Samenvatting