Durability of Silane Sealer in Highly Alkaline Environment

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Title: Durability of Silane Sealer in Highly Alkaline Environment

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

Publication: Materials Journal

Volume: 113

Issue: 4

Appears on pages(s): 387-393

Keywords: alkali-silica reaction; durability; penetrating water-repellent materials; silane

Date: 7/1/2016

Abstract:
Alkali-silica reaction (ASR) is a reaction that occurs over time in concrete between the highly alkaline cement paste and reactive noncrystalline amorphous silica, which is found in many common aggregates. The reaction can lead to expansion and severe damage in concrete members. One method to mitigate ASR expansion is to use a penetrating sealer such as silane. A set of columns located in a food preparation facility was treated with silane and a complimentary laboratory study was performed. A cleaning regimen involving application of an alkaline cleaner was employed at the facility, followed by rinsing with hot, pressurized water. The purpose of this research is to evaluate the effectiveness of silane when used in this alkaline environment. The research shows that silane was effective at reducing expansion in new concrete, less so when the pH of the environment is high; other measures will be needed for previously cracked concrete.