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Title:

Tennessee Stabilized Base Using Substandard Fly Ash and Byproduct Limestone Screenings
Cover of Tennessee Stabilized Base Using Substandard Fly Ash and Byproduct Limestone Screenings

Accession Number:

01474840

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Substandard fly ash (high carbon/loss-on-ignition (LOI)) and byproduct limestone screenings are plentiful materials in Tennessee. Utilization of these materials could result in both economic and environmental benefits. The Tennessee Department of Transportation (TDOT) Specification 312 for an Aggregate-Lime-Fly Ash Stabilized Base Course includes hydrated lime, fly ash, and TDOT Grading C limestone. The specification requires an average compressive strength of 950-psi (6.5-MPa) for three specimens, with no individual compressive strength less than 800-psi (5.5-MPa), after 28-days of curing at 100 °F (37.8 °C). The use of substandard fly ash and limestone screenings was compared to the use of standard materials. The control set consisted of the control fly ash with an aggregate blend, while the variable sets consisted of the control and variable fly ashes, respectively, with limestone screenings. The average compressive strength and coefficient of variation were 1,263-psi (8.71-MPa) and 5.8% for the control set, 1,416-psi (9.76-MPa) and 4.9% for the first variable set, and 966-psi (6.65-MPa) and 3.2% for the second variable set, respectively. The average static modulus of elasticity and coefficient of variation were 3,000-ksi (20.68-GPa) and 7.8% for the control set, 2,650-ksi (18.27-GPa) and 5.2% for the first variable set, and 1,400-ksi (9.65-GPa) and 8.7% for the second variable set, respectively. Analysis of these results indicates that a high LOI fly ash can be useful as a stabilizing agent when used in combination with hydrated lime. These results also suggest that byproduct limestone screenings can be used effectively as a significant part of the aggregate.

Supplemental Notes:

This paper was sponsored by TRB committee AFS80 Cementitious Stabilization.

Monograph Accession #:

01470560

Report/Paper Numbers:

13-0776
13-0776

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Dillon, Sarah
Crouch, Lewis Keith
Knight, Marcus L

Pagination:

14p

Publication Date:

2013

Conference:

Transportation Research Board 92nd Annual Meeting

Location: Washington DC, United States
Date: 2013-1-13 to 2013-1-17
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Geographic Terms:

Tennessee

Subject Areas:

Highways; Materials; Pavements; I33: Other Materials used in Pavement Layers

Source Data:

Transportation Research Board Annual Meeting 2013 Paper #13-0776

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Feb 5 2013 12:16PM