TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

Moisture Effect of Subgrade Resilient Modulus on Pavement Rutting

Accession Number:

01662647

Record Type:

Component

Abstract:

Pavement rutting depends largely on subgrade soil stiffness, which is a function of the in-situ moisture content and soil index properties. The subgrade soil moisture content may vary from the specified condition due to variations in the compaction procedure during construction and seasonal changes. The resilient modulus (M sub R) is used to define the subgrade soil stiffness, and is an important material input for the Mechanistic-Empirical (M-E) pavement design method. M sub R is typically determined by conducting cyclic triaxial tests, which can be complex and time consuming to perform. Therefore, correlations between M sub R and other stiffness parameters and index properties that are easier to obtain are often utilized. In this study, California Bearing Ratio (CBR) tests and laboratory M sub R tests were performed. The soil samples were prepared at moisture contents above and below the optimum moisture content (w sub opt). Correlations between the results from the two tests were developed and statistical models were developed to correlate generalized constitutive resilient modulus model parameters with soil index properties. Furthermore, pavement rutting was studied using the M sub R determined for the subgrade soils compacted at w sub opt and ±2% w sub opt. Results showed that a slight change in moisture content during compaction has a significant effect on M sub R, and subsequent pavement rutting. The peak value of both CBR and M sub R was found on the dry side of optimum and at a dry density less than the maximum. Subgrade soil moisture condition has shown less significant influence on rutting if stabilized aggregate base layer is used instead of untreated granular base.

Supplemental Notes:

This paper was sponsored by TRB committee AFP30 Standing Committee on Soil and Rock Properties.

Report/Paper Numbers:

18-01303

Language:

English

Authors:

Rahman, Md Mostaqur
Gassman, S L

Pagination:

17p

Publication Date:

2018

Conference:

Transportation Research Board 97th Annual Meeting

Location: Washington DC, United States
Date: 2018-1-7 to 2018-1-11
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Subject Areas:

Highways; Pavements

Source Data:

Transportation Research Board Annual Meeting 2018 Paper #18-01303

Files:

TRIS, TRB, ATRI

Created Date:

Jan 8 2018 10:20AM