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Title:

Effectiveness of Fly Ash in Mitigating Alkali-Silica Reactive Distress Induced by Pavement Deicing Chemicals

Accession Number:

01124798

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Deicing chemicals such as potassium acetate and sodium acetate are increasingly being used as environmentally friendly deicing and anti-icing chemicals on airfield pavements, without serious consideration towards the impact of these chemicals on durability of concrete. Investigations into the impact of these alkaline deicers on concrete containing alkali-silica reactive (ASR) aggregates have indicated strong potential for occurrence of ASR distress in concrete. This paper presents the findings from a study conducted to evaluate the effectiveness of fly ash in mitigating ASR distresses in the presence of deicing chemicals. In this study fifteen fly ashes from different sources with a wide range of chemical compositions were evaluated. Standard and modified ASTM test methods (ASTM C 1260, ASTM C 1567 and ASTM C 1293) were employed in evaluating the efficacy of these supplementary cementing materials. Tests were conducted on both mortar bars and concrete prism specimens, each series prepared with five different aggregates to study the mitigation behavior of fly ashes. All the fifteen fly ashes were evaluated at 25% cement replacement level, and three out of the fifteen fly ashes were evaluated at additional dosages of 15% and 35%. Changes in the length, dynamic elastic modulus and microstructure of the test specimens were studied. Results from tests with deicer-exposed specimens were compared with those exposed to standard 1N-NaOH solution. Findings from this study indicate that low and intermediate lime fly ashes were much more effective than high lime fly ashes at 25% and 35% cement replacement levels in the presence of pavement deicing chemicals. High-lime fly ashes were ineffective in mitigating expansions even at a replacement level of 35%.

Monograph Accession #:

01120148

Report/Paper Numbers:

09-3808

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Desai, Jigar
Rangaraju, Prasada Rao

Pagination:

36p

Publication Date:

2009

Conference:

Transportation Research Board 88th Annual Meeting

Location: Washington DC, United States
Date: 2009-1-11 to 2009-1-15
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures; Photos; References; Tables (4)

Uncontrolled Terms:

Sodium acetate

Subject Areas:

Aviation; Highways; Maintenance and Preservation; Materials; Pavements; I32: Concrete

Source Data:

Transportation Research Board Annual Meeting 2009 Paper #09-3808

Files:

TRIS, TRB

Created Date:

Jan 30 2009 8:13PM