00795310

Component

The high cost and environmental impact of pavement rehabilitation has led to an increase in the use of Cold In-Place Recycling (CIR) as an effective alternative to other rehabilitation strategies. However, currently there is not a universally accepted or standard mix-design for CIR. Therefore, the project is being undertaken with the objective to develop a performance-based mix design procedure for CIR through laboratory evaluation and limited field verification. The present project focuses on partial-depth CIR using asphalt emulsions as the recycling agent. After evaluating the modified Marshall mix-design recommended by the AASHTO Task Force No. 38, a new volumetric mix-design has been developed utilizing the Superpave gyratory compactor and technology. It requires that specimens are prepared at densities similar to those found in the field. It also suggests that specimens should be cured at 140 deg F for 24 hours. This will allow for the most consistent specimens, while at the same time, most effectively utilizing the time of laboratory personnel. It will also recommend that the resilient modulus of specimens prepared with the new mix-design will be used for pavement structural design.

Session A

English

16p

2000

Ninth AASHTO/TRB Maintenance Management Conference

Figures (3) ; References (10) ; Tables (7)

Asphalt emulsions; Bituminous pavements; Cold in-place recycling; Density; Field tests; Gyratory testing machines; Laboratory tests; Maintenance management; Mix design; Modulus of resilience; Pavement maintenance; Recycling; Specimens

Curing time; Partial depth

Highways; Maintenance and Preservation; Materials; I31: Bituminous Binders and Materials; I61: Equipment and Maintenance Methods

TRIS, TRB

Jul 17 2000 12:00AM

• NYSDOT'S SAFETY APPURTENANCE PROGRAM (SAFETAP) - MAINTAINING OUR ROADSIDE SAFETY ASSETS
• PAVEMENT MAINTENANCE: PREPARING FOR THE 21ST CENTURY
• REHABILITATION TECHNIQUES FOR STRIPPED ASPHALT PAVEMENTS IN MONTANA