Title: VERIFYING KNEADING RESILIENT MODULUS OF SOILS WITH BACKCALCULATED VALUES
Abstract: The characterization of soils in terms of resilient behavior is gaining support because of its immediate application in the mechanistic analysis of pavements. This report investigates an alternative procedure of resilient testing using the U.S. Army Corps of Engineers gyratory testing machine (GTM). The development of the GTM test procedure, focusing on the simulating conditions of a moving load, is summarized. With consideration to specimen confinement in the mold, a revised equation for kneading resilient modulus (M sub rk) is presented. The primary objective is to validate the GTM test procedure. For that purpose, six subgrade soils and three subbase materials are investigated using the GTM and the repeated load triaxial test, AASHTO T274-82. For in situ determination of resilient modulus of some of those soils (five samples only), Dynaflect and falling weight deflectometer deflections are obtained on finished pavements as well. Two computer programs--MODULUS and FPEDD1--were used to backcalculate the moduli of all of the layers. The GTM moduli compare poorly with the triaxial moduli in this nine-soil comparative study, nor was there any correlation between M sub rk and the backcalculated moduli when the latter was not corrected for nonlinear effects. However, the in situ modulus values (only five sites tested) agree with the GTM moduli with appropriate nonlinear correction, as programmed in FPEDD1. On the basis of the successful comparison with the in situ backcalculated moduli, it is concluded that GTM has the potential for resilient modulus characterization of subgrade soils.
Publication Year: 1993
Publication Date: 1993-01-01
Language: en
Type: article
Access and Citation
Cited By Count: 3
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot