Journal article
Calcium Oxychloride Formation Potential in Cementitious Pastes Exposed to Blends of Deicing Salt
ACI materials journal, Vol.114(4), pp.631-641
01 Jul 2017
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Chloride-based deicing salt solutions can react with the calcium hydroxide in the cementitious matrix, leading to the formation of calcium oxychloride. Calcium oxychloride formation has been implicated in the premature deterioration of pavement joints and concrete flatwork across cold regions in North America. This study examines the formation of calcium oxychloride in the presence of blends of different chloride-based deicing salts (sodium and calcium chloride). This evaluation was performed using several plain cementitious pastes and pastes with fly ash, slag, and silica fume used as supplementary cementitious materials. Fly ash and slag were used at 20% replacement levels and the silica fume was used at 3 and 6% replacement levels. Thermo-gravimetric analysis was used to quantify the amount of calcium hydroxide, and low-temperature differential scanning calorimetry was used to quantify the amount of calcium oxychloride formed. When the salt blends consist of less than 20% of calcium chloride by mass, the amount of calcium oxychloride that forms is low and does not depend on the calcium hydroxide content in the pastes. When the salt blends consist of more than 20% of calcium chloride by mass, the amount of calcium oxychloride that forms depends on the calcium hydroxide content in the paste and increases with calcium hydroxide content. This suggests two strategies to mitigate the amount of calcium oxychloride that is formed: reduction in the amount of calcium hydroxide in the pastes through use of supplementary cementitious materials, and the use of deicing salt blends that include lower amounts of calcium chloride. A model is developed to estimate the amount of calcium oxychloride formed in mixtures, given the calcium hydroxide and calcium chloride contents.
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Details
- Title
- Calcium Oxychloride Formation Potential in Cementitious Pastes Exposed to Blends of Deicing Salt
- Creators
- Prannoy Suraneni - Oregon State UniversityJonathan Monical - Purdue University SystemErol Unal - Georgia Institute of TechnologyYaghoob Farnam - Drexel UniversityJason Weiss - Oregon State University
- Publication Details
- ACI materials journal, Vol.114(4), pp.631-641
- Publisher
- Amer Concrete Inst
- Number of pages
- 11
- Grant note
- SPR 3864 / Indiana Department of Transportation (INDOT) as a part of the Joint Transportation Research Program (JTRP) Portland Cement Association (PCA) Foundation National Ready Mixed Concrete Association (NRMCA) Foundation
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Identifiers
- 991019167686904721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Construction & Building Technology
- Materials Science, Multidisciplinary