Design Parameters for Cold In Place Reclaimed Composite Pavement
FAN Tong jiang and ZHAO Lei
DOI:10.11835/j.issn.1674-4764.2010.04.010
Received December 23, 2009,Revised , Accepted , Available online July 01, 2015
Volume ,2010,Pages 49-57
- Abstract
The cold in place reclaimed composite base technique is a technique that the partially old asphalt pavement and the partially old base was milled together then reclaimed in place as a new base with flexible and rigid property. Taking the treatment project for failed asphalt pavement of Yuhu Expressway in Chongqing as a case study, the structure thickness and the structure composition, the material parameters, the technological parameters were studied and mechanic behavior was discussed for the cold in place reclaimed composite base. It is found that (1)based on milling and reclaiming asphalt concrete with up base stabilized by cement together, a suitable compacted thickness should be controlled within the 26cm to ensure the compaction quality for the cold in place reclaimed composite base,;(2)the void contents for the cold reclaimed composite base would be restricted at low than 12%;(3)a waterproof layer should be set and the thickness of new asphalt concrete should be paved to be more than 9cm on the cold in place reclaimed composite base;(4)the principal technical performances are recommended using the Marshall Flow(to be controlled in the range of the 3～5 mm)、soaked split strength(to be large than 0.45 MPa)、the freeze thaw split strength ratio(to be large than50%) and the bend strain( to be large than 1 800 με) as the controlled index of the cold reclaimed composite base. And the dynamic stability(to be large than 2000 times/mm)only is used as a secondary technical performance.