Mitigating Alkali-Silica Reaction and Freezing and Thawing in Concrete Pavement by Silane Treatment

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Title: Mitigating Alkali-Silica Reaction and Freezing and Thawing in Concrete Pavement by Silane Treatment

Author(s): R. A. Deschenes Jr., E. R. Giannini, Thano Drimalas, B. Fournier, and W. M. Hale

Publication: Materials Journal

Volume: 115

Issue: 5

Appears on pages(s): 685-694

Keywords: alkali-silica reaction (ASR); concrete pavements; freezing and thawing (F/T); mitigation; silane

Date: 9/1/2018

Abstract:
Alkali-silica reaction (ASR) and freezing and thawing (F/T) cause premature deterioration and reduce the service life of concrete structures, and both are difficult to mitigate in existing concrete pavements once deterioration occurs. The objective of this research program was to evaluate the efficacy of silane surface treatments used to reduce the moisture state of concrete pavements, thereby reducing further deterioration from ASR and F/T and increasing the remaining useful life of the pavement. The pavement test section evaluated contained a borderline-reactive fine aggregate and marginal air entrainment. The efficacy of silane was evaluated by instrumenting a pavement test section with devices for monitoring strain and internal RH. Core samples were extracted before and after treatment. The core samples were evaluated using the damage rating index (DRI). Results indicate silane may reduce the rate of deterioration in the concrete pavement compared to untreated control sections.