Alberta Transportation's Experience with Full Depth Reclamation

摘要

Alberta Transportation defines Full Depth Reclamation (FDR) as the in-situ process of pulverizing the entire Asphalt Concrete Pavement (ACP) layer and blending it with a portion of the underlying Granular Base Course (GBC). This pulverized blend is mixed with a bituminous stabilizing agent (foamed asphalt cement or emulsion) and a small amount of active filler such as Portland cement. Additional aggregate may be required to improve the gradation of the reclaimed material. The recycled mat is then overlaid with ACP or a double seal coat. In 2001, Alberta Transportation constructed its first stabilized FDR test section on Hwy 49:04 northwest of Grande Prairie. To the end of 2017, Alberta Transportation has completed 26 FDR projects representing 290 two-lane kilometres of pavement. Three highways were overlaid with a double seal coat, while the remaining were overlaid with ACP. Some projects treated the driving lanes only, while others treated the full width of the pavement. This paper discusses Alberta Transportation's project selection methodology, design criteria, specifications, and construction methodology. Monitoring to-date has included site inspections, analysis of Laser Crack Measurement System data, pavement smoothness testing, and structural evaluation. Monitoring results are presented along with potential improvements to the design and construction methodologies.