LOAD PULSE IN LAYERED PAVEMENT STRUCTURES FOR TROPICAL SOILS

This paper presents the calculation of graphs of variations of equivalent vertical stress pulse time associated with vehicle velocity and depth for six different flexible pavements having lateritic subgrade soils and structural layers of laterite gravels. One pavement profile has a lateritic sandy soil as the base layer, and another is representative of full depth paterite pavements. Mechanistic pavement design parameters were obtained in repeated loading triaxial tests with compacted specimens at optimum moisture contents. Stress pulse times at various depths for pavements having a crushed stone base were compared with those having laterite gravel layers. Compacted laterite gravel layers resulted in greater load pulse time when compared to crushed stone base layers. It is concluded that the stress duration pulse of 0.1 sec is reasonably representative for resilient modulus testing of subgrade for different depths of the six pavements profiles.

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Corporate Authors:
University of Mississippi, University

Center for Advanced Infrastructure Technology
University, MS United States 38677-1848
Authors:
- de Medina, J
- DA MOTTA, LMG
Publication Date: 2002-9

Language

English

Media Info

Features: Figures; References; Tables;
Pagination: p. 34-43
Serial:
- International Journal of Pavements
- Volume: 1
- Issue Number: 3
- Publisher: University of Mississippi, University
- ISSN: 1676-2797

Subject/Index Terms

TRT Terms: Crushed rock; Flexible pavements; Laterites; Lateritic gravels; Load factor; Moisture content; Pavement design; Pulses; Stress (Physiology); Subgrade (Pavements); Triaxial shear tests
Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

Accession Number: 00935099
Record Type: Publication
Files: TRIS, ATRI
Created Date: Dec 27 2003 12:00AM