Laboratory Investigation of Materials Type Effects on the Microsurfacing Mixture
Abstract: Pavement
preservation is a quintessential system of treating pavements at the optimum
time to maximize their useful life. One of the preventive maintenance treatment
options is using microsurfacing system as the acceptable and economical
solution. This study presents a laboratory investigation of aggregate type and
adhesive materials and their relationship to microsurfacing pavement properties
such as cohesion, wet track abrasion loss, excess asphalt and compaction. The
method of this study relies on ISSA A143, using the Cohesion 30 min and 60 min,
Wet track abrasion loss, Loaded-wheel excess asphalt and finally Loaded-wheel
compaction. The verification of this method was achieved through measuring the
various factors of specimens constructed in laboratory using two different
aggregate sources as river and mountain aggregates and two binders as CSS-1h
and CQS-1h. The results showed that mixes contain riverine aggregates showed
more cohesion properties. Base on wet track test results mixes, mixes
containing riverine type aggregate were more resistant to abrasion. In addition
CQS-1h emulsion showed better adhesiveness against abrasion in both types of
aggregates in asphalt mixes. With increased amount of emulsions in mixes, load
wheel values increased as well. Loaded wheel compaction test results confirmed
that river based aggregates are more susceptible to rutting failure. The
results of wheel tracking test illustrated that CSS-1h emulsion applied in
mixes had better resistance to rutting.
Keywords: Microsurfacing;
Aggregate; Cohesion; Wet Track; Loaded-Wheel Test; Polymer Modified Emulsion
Author: Mohammad Shafaghat
Lonbar, Mahmoud Nazirizad
Journal Code: jptsipilgg160020
