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Title: Evaluation of structural layers in flexible pavement
Authors: Grau, Robert W. (Robert Walter)
Keywords: Flexible pavements
Multiple wheel heavy gear loads
Structural layers
Traffic tests
Runway pavements
Publisher: Soils and Pavements Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: The investigation reported herein was conducted to evaluate the effectiveness of stabilized structural layers (lime- and cement-stabilized layers) in pavement performance and to determine the comparative performance between a full-depth high-quality crushed stone and the stabilized layers during simulated aircraft traffic. The comparative performance between the stabilized layers and similar pavements consisting of unbound granular base and subbase materials previously tested in the Multiple Wheel Heavy Gear Load (MWHGL) test section was also determined. A test section was constructed within two items of the existing MWHGL test section at the U.S. Army Engineer Waterways Experiment Station in order to utilize the existing 4-CBR clay subgrade. The test section consisted of four 24-in.-thick items. The structural layers above the subgrade for the respective items were : item 1, a 15-in.-thick lime-stabilized lean clay layer overlaid with 6 in. of crushed stone and 3 in. of asphaltic concrete (AC); item 2, a 15-in.-thick cement stabilized lean clay layer overlaid with 6 in. of crushed stone and 3 in. of AC; item 3, a 21-in.-thick crushed stone base and 3 in. of AC ; and item 4, a 21-in.-thick cement-stabilized clayey gravelly sand layer overlaid with 3 in. of AC. Items 1 and 2 were trafficked with a 360-kip 12-wheel assembly, a 160-kip twin-tandem assembly, and a 50-kip single-wheel assembly; items 3 and 4 were trafficked with a 200-kip twin-tandem assembly and a 75-kip single-wheel assembly. Mixed traffic was applied to item 4 with the 360-kip 12-wheel and 75-kip single-wheel assemblies. The test items utilizing stabilized structural layers as elements in the flexible pavement performed as well as or better under traffic than the same thicknesses of conventional pavement previously tested in the MWHGL test section. NOTE: This file is large. Allow your browser several minutes to download the file.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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