01476031

Component

In recent years there has been an increased interest in determining the influence of moisture changes on the resilient modulus (MR) of subgrade soils beneath a pavement. Also efforts have been made to develop mathematical models that predict the change in MR values with moisture. These models are expected to account for seasonal variations in subgrade moisture content. The present study evaluates the variation of resilient modulus with post-compaction moisture content of soils in Oklahoma. A series of specimens were compacted at optimum moisture content and then tested for resilient modulus; other series of specimens were prepared at optimum moisture content and then either wetted to higher moisture contents or dried to lower moisture contents prior to MR testing. Results showed that MR-moisture content relationships varied with soil types. MR decreased as moisture content increased and increased with a decrease in moisture content. Finally, an MR-moisture model is proposed that predicts the variation of resilient modulus with moisture contents. This model would be helpful in predicting the changes in bearing capacity of pavements due to seasonal variations of moisture content.

This paper was sponsored by TRB committee AFP60 Engineering Behavior of Unsaturated Soils.

01470560

13-4830

English

15p

2013

Transportation Research Board 92nd Annual Meeting

Digital/other

Figures; References; Tables

Modulus of resilience; Moisture content; Soil types; Subgrade (Pavements); Subgrade materials; Unsaturated soils

Oklahoma

Geotechnology; Highways; Pavements; I42: Soil Mechanics

Transportation Research Board Annual Meeting 2013 Paper #13-4830

TRIS, TRB, ATRI

Feb 5 2013 12:56PM