Stress history effects in basecourse materials
The behaviour of a crushed dolerite with clay binder was studied under simulated traffic loadings using cyclic triaxial tests at constant stress ratio. The effects of the magnitude of the applied stresses, stress history and compound loading was observed in the resulting dynamic and permanent strains. It was found that the static mohr coulomb envelope formed a natural boundary to the permanent strain contours. Although the effects of stress level on lateral and permanent strains were different, points on the same permanent strain contours had similar rates of growth of permanent strains with load repetitions. From observations of the behaviour of samples subjected to compound loading situations, a permanent strain law is proposed for such cases using a cumulative approach based on total load repetitions. Considering the fluctuations in material response from stress history, material variability and the discrepancy between laboratory and field environments, an approach is formulated for characterisation of unbound base course materials using a limited number of static and simplified cyclic loading tests. Like most unbound base course materials, the material is cross anisotropic and this is continually apparent in the observed behaviour (a).
- Record URL:
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Authors:
- Barrett, J R
- Smith, D M
- Conference:
- Publication Date: 1976
Language
- English
Media Info
- Pagination: 30-9, 48-9
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Serial:
- Volume: 8
- Issue Number: 3,SESSION7
Subject/Index Terms
- TRT Terms: Base course (Pavements); Deformation; Elasticity (Mechanics); Isotropic materials; Loads; Properties of materials; Repeated loads; Stresses; Triaxial shear tests
- ATRI Terms: Basecourse; Deformation; Elasticity; Isotropic; Load; Material properties; Repetitive loading; Stress; Triaxial test
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 01442301
- Record Type: Publication
- Source Agency: ARRB
- Files: ATRI
- Created Date: Aug 25 2012 12:05AM