Quantity of Alkali Silica Gel and Its Effect on Concrete Properties
Publication: Journal of Materials in Civil Engineering
Volume 10, Issue 2
Abstract
A quantitative gel fluorescence technique was used to investigate relationships between the extent of alkali silica reactivity (ASR) and properties of concrete cores of varying ages taken from over 20 bridges or pavements in North Carolina. The cores had varying degrees of ASR and were composed of a wide variety of aggregates and cementitious materials. The technique, combining image processing and analysis with a Strategic Highway Research Program qualitative gel fluorescence method, is described and results are discussed. The effects of lamp intensity, thresholding, video averaging, and color based discrimination to differentiate fluorescing areas are reviewed. Preliminary statistical analysis of the technique is presented. While no useful correlation was found between the mechanical properties of cores and the apparent gel content, a strong correlation was found between the percent area of fluorescing material and the log10 expansion of cores after immersion in an alkaline solution for 90 days.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 10 • Issue 2 • May 1998
Pages: 106 - 111
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: May 1, 1998
Published in print: May 1998
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