Performance of Geogrid Stabilized Roadways Constructed over Expansive Clay Subgrade
Publication: Geo-Extreme 2021
ABSTRACT
To mitigate the effect of expansive clay on roadway foundations, TxDOT conducted a research study by utilizing a combined technique of mechanical and chemical stabilization. The existing subgrade, consisting of expansive clay, was stabilized with cement. The structural pavement section consisted of a 150 mm thick aggregate base course (ABC) with chip seal surfacing. A portion of this pavement section consisted of geogrid stabilized ABC. Field performance was measured by monitoring pavement distresses and the change in elevation of the pavement surface. In situ characterization of the pavement sections was conducted using Automated Plate Load Testing (APLT). The pavement consisting of geogrid showed less longitudinal cracking after experiencing a series of wet and dry season cycles and heavy trafficking. These observations were also supported by the results of APLT which indicated that the pavement with geogrid preserved the stiffness of the aggregate layer over time.
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Geo-Extreme 2021
Pages: 278 - 287
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© 2021 American Society of Civil Engineers.
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Published online: Nov 4, 2021
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