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Title: Mitigation of Alkali-Silica Reaction and Freezing and Thawing through Surface Treatment

Author(s): Richard A. Deschenes Jr., Cameron D. Murray, and W. Micah Hale

Publication: Materials Journal

Volume: 114

Issue: 2

Appears on pages(s): 307-314

Keywords: alkali-silica reaction (ASR); breathable vapor barrier; elastomeric paint; freezing and thawing; linseed oil; mitigation; silane

Date: 3/1/2017

Abstract:
The research program included an investigation of mitigation methods applied to concrete barrier walls that exhibited damage due to alkali-silica reaction (ASR) and freezing and thawing. The damage within the barrier varies inconsistently between sections. Although most of the barrier exhibits minimal visible damage, large portions of the barrier show moderate damage, and several sections exhibit severe damage or complete failure. Several sections of the median barrier, with different initial damage, were instrumented to monitor strain and internal relative humidity. Sections were then treated with surface treatments and monitored for 2 years. Preliminary conclusions show that silane is effective in controlling ASR within the damaged sections of the barrier. The sections of moderate and severe damage expanded rapidly during winter months due to freezing-and-thawing distress. However, silane reduced the ASR and freezing-and-thawing-related distress in the moderate and severely damaged sections.


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