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Title: Study of behavior of bituminous-stabilized pavement layers
Authors: Burns, Cecil D.
Ledbetter, R. (Richard)
Grau, Robert W. (Robert Walter)
Keywords: Aggregates
Base courses
Bituminous soil stabilization
Granular materials
Rigid pavements
Traffic tests
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 (A.) compare the performance of bituminous-stabilized base and subbase materials with that of unbound granular materials as used in the original multiple-wheel, heavy gear load (MWHGL) test section and (B.) determine the di fference in performance between a high quality bituminous base constructed of crushed aggregate and a bituminous base constructed of a lower quality uncrushed material. A test section was constructed within the existing MWHGL test section at the U. S. Army Engineer Waterways Experiment Station (WES), utilizing the exist ing 4.0-CBR clay subgrade. The test section consisted of four test items. Items 1 and 2 were constructed to a thickness of 15 in., and items 3 and 4 to a total thickness of 24 in. In item 1, the granular base and subbase used in the original construction were replaced by a bituminous-stabilized base constructed of the uncrushed gravelly-sand subbase material used in the original MWHGL test section. Cement filler of 6.5 perc ent was used with the aggregate to improve the gradation. Item 2 was identical with item 1, except for the 12-in. base, which was constructed of a high quality asphaltic concrete containing crushed lime stone. In item 3, the unbound crushed-stone base used in the MWHGL test section was replaced by a high quality asphaltic-concrete base, and the gravelly-sand subbase in the bottom 15 in. of the structure was stabilized with asphalt cement. Item 4 was identical with item 3, except that the gravelly sand was not stabilized. A 3-in.-thick surface layer of high quality asphaltic concrete was constructed over all test items. The test items were subjected to traffic with a simulated C-5A main gear 12-wheel assembly with a 360,000-lb gross load and with a 75,000-lb single-wheel assembly, The results of tests showed that : the performance of the bituminous bound base and subbase materials was superior to that of similar pavements constructed of unbound granular materials used in the original MWHGL test section at the WES, the quality of aggregate used in the bituminous base courses had a significant effect on pavement perfonnance, and the greatest benefit from bituminous stabilization was in upgrading the quality of poor-to-borderline materials. 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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