Accelerated Testing for Studying Pavement Design and Performance (FY 2002): Performance of Foamed Asphalt Stabilized Base in Full Depth Reclaimed Asphalt Pavement;Final rept. July 2001-November 2003

摘要

This report covers the Fiscal Year 2002 project conducted at the Accelerated Testing Laboratory at Kansas State University. The project was selected and funded by the Midwest Accelerated Testing Pooled Fund Program , which includes Iowa, Kansas, Missouri and Nebraska. The objective of this research was to determine the effectiveness of the use of foamed asphalt stabilized Recycled Asphalt Pavement from full-depth reclamation (FAS-FDR) as base material for flexible pavements. The experiment, conducted at the Accelerated Testing Laboratory (ATL) of Kansas State University, consisted of constructing four pavements, one with a nine inch conventional Kansas AB-3 granular base and three with six, nine and 12 inches of FAS-FDR, and subjecting them to full-scale accelerated pavement test. All four pavements sections were loaded with 500,000 ATL load repetitions, at room temperature and under moderate moisture levels in the subgrade soil. The measured stresses and strains as well as the permanent deformation (rutting) observed on the pavement sections indicated that FAS-FDR can be successfully used as a base material. The measured rut depths and compressive vertical stresses at the top of the subgrade suggest that one inch of FAS-FDR base shows performance equivalent to that of one-inch conventional Kansas AB-3 granular base. The effective structural number computed from the FWD deflection tests on the as-constructed pavements showed that average structural layer coefficient for the FAS-FDR base material is 0.18.