Evaluation of the base/subgrade soil under repeated loading : phase II, in-box and ALF cyclic plate load tests [tech summary].
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2012-03-01
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Alternative Title:In-box and ALF cyclic plate load tests : [tech summary];LTRC Technical Summary 471;
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Abstract:The inadequacy of many existing roads due to rapid growth in traffic volume provides a motivation for exploring alternatives to
existing methods of constructing and rehabilitating roads. The use of geosynthetics to stabilize and reinforce paved and unpaved
roadways offers one such alternative. Many studies were conducted to evaluate the improvements associated with geogrid
reinforcement of pavements. It is widely believed that geogrid reinforcement of roadways can extend a pavement’s service life and/or
reduce the pavement’s structural thickness.
Several design methods were proposed for flexible pavements with geogrid reinforced base layers. These methods were either based
on empirical or analytical approaches. Empirical design methods are usually based on obtaining a performance level from a laboratory
model test, which is then extrapolated to the field conditions for design application. The geogrid reinforced design methods based on
analytical solution do not address all the variables that affect the performance of these pavements. This report is part of a research
study on evaluating the benefits of geogrid reinforcement of base layers in flexible pavements.
It presents the findings from large-scale cyclic plate load tests on Accelerated Load Facility (ALF)
sections and sections built inside a test box. Another report presented the findings from laboratory
triaxial tests and finite element analyses.
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