Degree Type

Thesis

Date of Award

2012

Degree Name

Master of Science

Department

Civil, Construction, and Environmental Engineering

First Advisor

David J. White

Abstract

Freezing and thawing processes damage pavement foundation systems; increase pavement and vehicle maintenance costs; reduce traveler comfort and safety; decrease fuel economy; and decrease pavement life spans. Current pavement design methods provide limited guidance for characterizing frost-susceptible materials. A laboratory frost-heave and thaw-weakening test could be used to differentiate frost-susceptible materials from non-frost-susceptible materials to reduce the effects of frost action.

The goal of this research was to provide guidance for selecting pavement foundation materials based on their freeze-thaw durability. The objectives of this study were to use ASTM D5918 Standard Test Methods for Frost Heave and Thaw Weakening Susceptibility of Soils to determine the relative frost-susceptibility of various soil types; study the effects of stabilizers on reducing frost-susceptibility; and determine seasonal changes of in situ pavement support conditions.

The important outcomes of this research are that it is difficult to predict frost-heave susceptibility from USCS classifications; the coefficients of variation for ASTM D5918 test results were similar to published results; when stabilizing loess with cement, increased cement content decreased the range of initial moisture contents that result in maximum compressive strength; and compared to unstabilized loess, cement-stabilized loess was found to be non-frost-susceptible, but fly ash-stabilized loess showed only slight improvement.

This research suggests that using a test such as ASTM D5918 to compare the relative frost-susceptibility of pavement foundation materials in the design phase may reduce the effects of frost action.

Copyright Owner

Alex Johnson

Language

en

File Format

application/pdf

File Size

486 pages

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