KSCEE Webinars

[May 21, 2018] Behavior of Geosynthetics-Reinforced Pavement Foundation under Moving Wheel Loading

Author
Date
2018-05-23 20:35
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1999
Title: Behavior of Geosynthetics-Reinforced Pavement Foundation under Moving Wheel Loading

Speaker: Sung-Hee Sonny Kim, University of Georgia

Abstract:

Geosynthetics reinforcement is an economically viable alternative to achieve improved performance in highway pavement construction in regions with soft problematic subgrade soils or with a reduction in aggregate layer thickness to reduce construction costs. To examine the potential benefits of using geosynthetics in pavement foundations, measurement of permanent deformation using laboratory triaxial tests is typical in practice. However, since the performance improvement of pavement foundation systems is achieved by distribution of vertical stresses at the reinforcing layer through the tensile properties of the geosynthetics material, it is desirable to conduct large-scale testing to more accurately monitor the behavior of the geosynthetics-reinforced aggregate and soil system. This webinar describes the development of laboratory large-scale pavement testing systems to evaluate the behavior of geosynthetics reinforced pavement systems through wheel tests performed with problematic subgrade soils found in North Georgia. The large scale test specimens are prepared in a 1.8 meter (6 feet) long x 1.8 meter (6 feet) wide x 0.6 meter (2 feet) deep metal box and consist of 305 mm meters (12 in.) of unbound aggregate base (UAB) overlying 305 mm (12 in.) of subgrade soil. Geosynthetics are placed at the interface between the subgrade soil and UAB layer. Pressure sensors are installed near the bottom of the UAB layer and near the top and bottom of the subgrade layer to monitor stress distributions within the pavement foundation system. The webinar presents test results showing vertical stress variations obtained experimentally in the UAB and subgrade soils under simulated traffic tire loading.


Short Biography :

Dr. Sung-Hee Sonny Kim is an associate professor of Civil Engineering at the University of Georgia. Before joining the academia, Dr. Kim has been an integral contributor to several nationwide highway/airport pavement improvement projects. Dr. Kim is a ASCE Fellow and recipient of Outstanding Faculty Award from Polytechnic Foundation of KSU, inc. and the Public Service and Outreach Faculty Fellowship from the University of Georgia.

He is an associate editor of Journal of Sustainable Civil Infrastructures and board member of ASCE Geo-Institute Pavement Committee and T&DI Highway Highway Pavement Committee. Also, Dr. Kim is a board member of TRB AFN 20 Properties of Concrete and vice president of US Korean Geotechnical Society.

Dr. Kim’s primary research has been in the various areas such as recycled materials, constitutive modeling of pavement materials, and performance prediction and evaluation of transportation infrastructure. Dr. Kim is a licensed professional engineer and has written over 70 refereed journal articles and reports.