You are being redirected because this document is part of your ASTM Compass® subscription.
This document is part of your ASTM Compass® subscription.
If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass
Volume 51, Issue 1 (September 2021)
Special Issue Paper
Influence of Piston Friction on Resilient Modulus of Subgrade Soil
(Received 15 January 2021; accepted 21 July 2021)
Published Online: 20 September 2021
For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.
For Microsoft Word
The repeated load triaxial test has been commonly used to evaluate the resilient modulus of base, subbase, and subgrade soils. When conducting the resilient modulus test, if a load cell is placed outside the chamber to measure the axial load, the piston friction is included in the axial load, resulting in inaccuracy on the resilient modulus. Hence, piston friction needs correcting prior to the resilient modulus test when using the external load cell to measure the axial load. In this study, quasi-static and dynamic corrections of the piston friction were conducted under various displacement rates and confining pressures. Test results indicate that the piston friction increases with increasing confining pressure. A correlation model between the piston friction and the confining pressure was established. Besides, the influences of piston friction on the resilient modulus of A-7-5 soil compacted at the optimum moisture content were evaluated. Test findings demonstrate that the resilient modulus is overestimated when ignoring the piston friction, especially at low deviator stress. Procedures for the correction of the piston friction were established and presented.
Department of Civil Engineering, National Pingtung University of Science and Technology, Neipu, Pingtung
Stock #: JTE20210027
Title Influence of Piston Friction on Resilient Modulus of Subgrade Soil