C&D Waste For Road Construction:
Long Time Performance Of Roads Constructed
Using Recycled Aggregate For
Unbound Pavement Layers
Author(s)
F. Lancieri, A. Marradi & S. Mannucci
Abstract
This paper describes the results of the experimental measurements carried out
during 2001 and 2005 on two secondary roads built in 1998 using C&D
aggregates for subgrade and subbase layers. Field data included structural data in
the form of nondestructive testing (NDT) performed with a Falling Weight
Deflectometer and laser profilometer, visual condition survey, traffic
measurements and construction and maintenance history data. The FWD
deflection measurements were analysed to determine modulus values for the
various pavement layers while profile data were used to calculate evenness index
(IRI). Deflection tests performed in 2001 showed that in-situ pavement
performance was better than expected. This performance improvement was
explained by self-cementing properties. Field tests repeated in 2005 revealed a
meaningful difference in the structural behavior of the road pavements
examined: the first, subjected to heavy vehicles, showed a marked improvement
in backcalculated moduli of the subbase pavement layer while the second, not
subjected to heavy vehicles, maintained practically the same values of layer
moduli. These field tests were integrated with laboratory tests performed in order
to investigate the time evolution of mechanical characteristics of C&D materials
and to evaluate the influence of compaction techniques on the improvement in
resistance recorded with the gyratory compactor. The data and results presented
confirm that road construction could offer a reliable use for C&D waste
recycling.
Keywords: C&D , unbound layers, FWD, back analysis, gyratory compactor.
Keywords
C&D , unbound layers, FWD, back analysis, gyratory compactor.
Related Book
Other papers in this volume
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