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Title:

Analysis of Fly Ash as a Partial Substitute for Portland Cement to Minimize Freeze-Thaw Damage in Cement-Treated Base

Accession Number:

01340938

Record Type:

Component

Abstract:

The use of cement-fly ash (CFA)-stabilization has been successfully implemented in roadway construction to produce strong base layers; however, the freeze-thaw durability of this material has not been adequately studied. The objectives of this research were to assess the freeze-thaw durability of CFA-treated base and then compare the performance of CFA-treated base to standard cement-treated base (CTB). Material from a reclaimed flexible pavement was used to create unconfined compressive strength (UCS) specimens in a controlled laboratory environment. The specimens were treated with either CFA (cement-to-Class F fly ash ratio of 4:1 by weight) or cement at one of two stabilizer contents and cured for 7 days, 28 days, or 6 months. The specimens were then conditioned with either a 4-hour soak or vacuum saturation, where the latter was performed as a much faster alternative to standard freeze-thaw durability testing. An analysis of variance was used to identify the factors that were statistically significant in explaining variation in the observed UCS of the treated material. All CFA-treated specimens had a 7-day UCS above 300 psi and exhibited adequate durability. The average UCS of the CFA-treated specimens was 88 percent of the average UCS of the cement-treated specimens, which translates to a decrease of only 80 psi. The data are inconclusive to suggest that a partial fly ash substitution would reduce freeze-thaw damage of standard CTB. Nonetheless, CFA base stabilization appears to be a viable option for producing a strong and durable layer for cold regions pavements.

Monograph Accession #:

01329018

Report/Paper Numbers:

11-4286

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Wilson, Bryan Thomas
Guthrie, W Spencer
Eggett, Dennis L

Pagination:

20p

Publication Date:

2011

Conference:

Transportation Research Board 90th Annual Meeting

Location: Washington DC, United States
Date: 2011-1-23 to 2011-1-27
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures (9) ; References (26) ; Tables (3)

Uncontrolled Terms:

Cement treated bases

Subject Areas:

Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways

Source Data:

Transportation Research Board Annual Meeting 2011 Paper #11-4286

Files:

TRIS, TRB

Created Date:

Feb 17 2011 6:48PM