ฐิตาพรรณ ฉันทโชติ. Deflection Behaviors of Geosynthetic-Reinforced Polymer-Modified Asphalt. Master's Degree(Civil Engineering). King Mongkut's University of Technology Thonburi. KMUTT Library. : King Mongkut's University of Technology Thonburi, 2011.
Deflection Behaviors of Geosynthetic-Reinforced Polymer-Modified Asphalt
Abstract:
Behaviors of polymer modified asphalt (PMA) pavement reinforced with geosynthetic
reinforcement were studied by performing a series of scaled-down physical model tests
in the laboratory. In these tests, both subbase and base layers were modeled by cleaned
uniform sand while the PMA pavement was prepared to be 6 cm thick, eitmy reinforced
with geosynthetics or unreinforced. The modeled pavement was repeatedly compressed
for 200 cycles by means of a 6 cm wide rigid rough footing placed at the center of the
PMA pavement. The footing and surface settlements of PMA pavements were measured
by laser displacement sensors. In addition, maximum strain distribution of the modeled
subbase and base layers was determined by a photogrammetric analysis. Considering
the permanent settlement of footing and surface settlements, the performance of PMA
pavements improved when they were reinforced with geosynthetics for both new and
overlayed pavements cases. Tmy is due to increase of the rigidity of reinforced PMA
pavement. The maximum shear strain distribution of the modeled subbase and base
layers reinforced with geosynthetics also decreased; because of the geosynthetic
reinforcement effectively distributed stress to a much wider area supporting layer
underneath. Then, the test results were also compared with the ones performed with
HMA pavement previously. The permanent settlement of footing and maximum shear
strain distribution in PMA pavements were substantially smaller than the ones in HMA
pavements, both unreinforced and reinforced cases. These results indicated that
replacing asphalt cement (AC) with polymer modified asphalt cement (PM-AC) could
increase the stiffness of the pavement.