Characterization of Illinois Aggregates for Subgrade Replacement and Subbase

Tutumluer, Erol; Mishra, Debakanta; Butt, Abbas A.

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https://hdl.handle.net/2142/45969 Copy

Description

Title

Characterization of Illinois Aggregates for Subgrade Replacement and Subbase

Author(s)

• Tutumluer, Erol
• Mishra, Debakanta
• Butt, Abbas A.

Issue Date

2009-12

Keyword(s)

Unbound aggregates, pavement working platform, aggregate shape, type of fines, fines content, moisture density, shear strength, resilient modulus, permanent defomation

Abstract

Construction of a pavement working platform is often needed on soft, unstable soils to provide sufficient stability and adequate immediate support for equipment mobility and paving operations without developing excessive rutting. The aggregate type and quality are important factors for determining the required treatment/ replacement thickness. The overall objective in this project has been to characterize strength, stiffness, and deformation behavior of three crushed and uncrushed aggregate materials, i.e., limestone, dolomite and uncrushed gravel, commonly used in Illinois for subgrade replacement and subbase. The goal has been to develop aggregate thickness correlations with aggregate properties to modify and improve the thickness requirement curve in IDOT’s Subgrade Stability Manual based on both laboratory and field performances. The initial laboratory phase of the study presented in this report considered both plastic and non-plastic fines (passing No. 200 sieve or 0.075 mm) blended in the engineered gradations of the limestone, dolomite and uncrushed gravel at 4%, 8%, 12%, and 16% target fines content. From the test results, the most important property at low fines contents (less than 8%) was the aggregate type governed by the angularity, i.e. crushed or uncrushed, and the amount of voids in the aggregate matrix. Especially when plastic fines with a plasticity index or PI of 10 or higher were included, the amount of fines had a drastic effect on aggregate performance.

Series/Report Name or Number

ICT-09-060 UILU-ENG-2009-2042

ISSN

0197-9191

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/45969

Sponsor(s)/Grant Number(s)

ICT-R27-1

Copyright and License Information

No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161

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