Evaluation of Aggregate Subgrade Materials Used as Pavement Subgrade/Granular Subbase

Kazmee, Hasan; Tutumluer, Erol

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https://hdl.handle.net/2142/79520 Copy

Description

Title

Evaluation of Aggregate Subgrade Materials Used as Pavement Subgrade/Granular Subbase

Author(s)

• Kazmee, Hasan
• Tutumluer, Erol

Issue Date

2015-07

Keyword(s)

• aggregate subgrade
• subgrade stability
• permanent deformation
• accelerated pavement testing
• construction platforms
• low-volume roads

Abstract

With recent focus on sustainable construction practices and the ever-increasing transportation costs and scarcity of natural resources, integration of large-size and marginally acceptable aggregates and recycled materials (e.g., reclaimed asphalt pavement [RAP]) with current construction specifications is becoming imperative. As an incentive, the Illinois Department of Transportation has been using large-size rocks, popularly known as aggregate subgrade. However, adequate scientific knowledge about material performance is largely unknown. To this end, a research study was undertaken at the Illinois Center for Transportation to evaluate the adequacy and field performances of IDOT’s new aggregate subgrade specifications. A state-of-the-art image analysis technique was used to characterize the size and shape as well as the texture and angularity properties of selected aggregate subgrade materials. For field evaluation, 24 combinations of pavements were constructed over subgrade with controlled low immediate bearing value (IBV) or unsoaked California bearing ratio (CBR) strength properties. Construction quality control was achieved through in-place density and modulus measurements on aggregate layers using a nuclear gauge, lightweight deflectometer, and soil stiffness gauges. Periodic rut measurements were carried out on the pavement surface throughout the accelerated loading process using an Accelerated Transportation Loading Assembly (ATLAS). Contributions of the underlying pavement layers to the total rut accumulation were evaluated through innovative applications of ground-penetrating radar (GPR), a lightweight variable-energy penetrometer device, known as the PANDA, and a geo-endoscopy probe. Layer intermixing and material migration at the aggregate subgrade– subgrade interface improved the foundation layer stiffness properties and pavement performance results significantly. RAP-capped construction platforms consistently exhibited a higher magnitude of rutting. Performances of flexible pavement sections were governed by the as-constructed HMA thicknesses, which varied considerably during the paver operation because of RAP subbase sinkage and the weak subgrade. Adequate validation and potential revisions to current IDOT specifications were recommended

Publisher

Illinois Center for Transportation/Illinois Department of Transportation

Series/Report Name or Number

Illinois Center for Transportation Series No. 15-013/Research Report No. FHWA-ICT-15-013.

ISSN

0197-9191

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/79520

Sponsor(s)/Grant Number(s)

Illinois Department of Transportation, R27-124

Copyright and License Information

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

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