Performance of geogrid-stabilized gravel flexible base with bituminous surface treatment
Norwood, Gregory J.; Tingle, Jeb S.
Abstract: The US Army Engineer Research and Development Center (ERDC) constructed a full-scale test section to evaluate the performance of geogrid-stabilized thin highway pavements and farm-to-market roads. The test section included two pavement sections representative of typical farm-to-market roads, each composed of a double bituminous surface treatment over a flexible base course of crushed limestone and a 6 CBR clay subgrade. One test item was surfaced with a double bituminous surface treatment and a 6-in., crushed-limestone base course stabilized with geogrid. The second test item was surfaced with a double bituminous surface treatment and an unstabilized 8-in., crushed-limestone base course. Each test lane contained a suite of instrumentation consisting of earth pressure cells, moisture probes, pore water pressure transducers, and temperature probes. The geogrid was also instrumented with strain gauges in an attempt to determine the strain mobilized in the geogrid during testing. Each test lane was trafficked with simulated truck traffic to evaluate the rutting performance of the different pavement sections. The results were used to determine the effectiveness of the geogrid reinforcement and to develop performance data for the validation of mechanistic performance models for geogrid-stabilized pavements. This report summarizes the material characterization, pavement construction, instrumentation response, and performance response of the two test items.
Geotechnical and Structures Laboratory (U.S.)Engineer Research and Development Center (U.S.)
Gravel; Pavements, Bituminous--Testing; Geogrids; Geosynthetics