Performance of Fabric Reinforced Aggregate-Soil Systems under Repeated Loading.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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The performance of a geotextile or fabric interlayer in pavement systems comprised of an aggregate surface over a soft subgrade was analyzed through a half-scale model test program. Stress, strain, and displacement responses were monitored during the testing. Independent variables included subgrade strength, crushed stone layer thickness, dynamic load pulse duration, and presencetype of interlayer. The performance criterion by which variable influence was analyzed was the number of load cycles at which specific rut depths were reached. Increased subgrade strength, increased aggregate layer thickness, decreased load pulse duration, and the presence of a geotextile inter-layer were found to improve system performance. Experimental results were used to analyze the effectiveness of existing analysisdesign methodologies and to derive equations relating key system parameters to the load cycle-surface rutting relationships for aggregate-subgrade AS systems and aggregate-fabric-subgrade AFS systems reinforced with Typar 3401 fabric. Recommendations are made for the development of design charts for AS and Typar 3401 reinforced AFS systems. Author
- Civil Engineering