Economic Impacts of FInes I: The Unbound Pavement Layers

Abstract and project information last updated: 16 August 2011. Project updates are dated below.

AUTC
Project
Number
510012
Principal
Investigator
Juanyu (Jenny) Liu
jliu6@alaska.edu
Funding
Agency

AUTC and ADOT&PF

Project
Budget
150000
Start
Date
1 August 2011
Estimated
End Date
31 December 2012

Abstract

In Alaska’s spring months, excess water thawing underneath road pavement wakens roads and other transportation infrastructure, causing great expense and inconvenience for travelers, commercial drivers and the state of Alaska. University of Alaska Fairbanks (UAF) researcher Juanyu Liu is examining how the fines (P200) in base materials effect frost susceptibility and support for vehicular loads during spring thaw. Realizing the variation in critical excess fines content, Liu’s team is evaluating the financial impact of using allowable fines in the unbound pavement layers and will identify critical excess fines contents (i.e. threshold fines content) allowed in the typical Alaska unbound base courses.

Expanding upon a recent UAF study, Liu is further investigating the impact of fines content on resilient modulus reduction base courses during thawing when frozen under different temperature gradients and with limited water access. To do this, Liu and her team simulate a closed water system by collecting soil specimens with different initial moisture and fines contents and freeze them in the frost heave cell with no access to water. Her team then tests resilient moduli of soil specimens under different and drained conditions. The testing will provide recommendations to determine the situations when ADOT&PF can relax stabilized base policies and/or reduce costs by allowing more fines in the base layers for highway construction.

Final Report

Pavement Research Update
25 Jun 2012

Pavement Research Update
Dr. Jenny Liu
Jenny-Liu-Pavement-Preservation-Update-June-20-2012.pdf

Related Project Activity

7 November 2014

Financial Impact of Fines in the Unbound Pavement Layers

by billy.connor

revised final Fines report 10 09 14 (1)

25 June 2012

Pavement Research Update

by Joel Bailey

On June 20th, Dr. Jenny Liu presented an update on multiple research projects on asphalt and pavement research:

Jenny Liu Pavement Research Update June 20 2012