Sub-base stability: A shear-box test compared with other prediction methods
Abstract
A series of pilot-scale trafficking trials were carried out with a loaded lorry and with a wheeled paver on several types of crushed rock and sand and gravel sub-bases complying with the Type 1 requirements of the DTp specification; results were used as a basis for comparing the usefulness of methods of predicting stability of such materials under construction traffic. As expected, simple tests of grading or angularity and descriptions of petrological groups of aggregates were found to be unreliable parameters of stability. CBR tests also gave results which were unsatisfactory for this purpose. Although it was found that the established Mohr-Coulomb shear-strength theory could not be applied to the materials examined, a modified 300mm shear-box test was found to give a reliable classification of stability on non-platic sub-bases. A simpler method, based on measurements of decelerations of a drop-hammer device also shows promise.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1977
- Bibcode:
- 1977STIN...7830436P
- Keywords:
-
- Foundations;
- Pavements;
- Aggregates;
- Composite Materials;
- Gravels;
- Loads (Forces);
- Reliability Engineering;
- Rocks;
- Sands;
- Engineering (General)