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A predicitve model for the assessment of aggregate sensitivity to ASR

  • Different aggregates stored in alkaline solutions have different solubility of silica and alumina. The dissolved silica reacts with water and alkalis to form an alkali silica gel, which can swell. ASR swelling can be reduced or prevented, if enough space is available for the alkali silica gel formation. This “space” is the open porosity, which can also be determined directly at the aggregate grains. Concrete specimens made with different aggregates were produced. They all were stored in a fog chamber at 104°F (40°C) and the ASR swelling was measured for one year. At the same time, the aggregates were stored in 0.1 mol KOH solution at 176°F (80°C) for 56 d only. The solubility of silica and alumina was determined continuously by ICP-OES. The obtained dissolution rates, open porosity and expansion data were compared and a reliable model for predicting the ASR sensitivity of concrete aggregates was derived.

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Author: Mario Kositz, Klaus-Jürgen HüngerGND
URL:https://www-docs.b-tu.de/fg-baustoffe/public/Supp_320_24.pdf
Title of the source (English):ICCM, 10th ACI/RILEM International Conference on Cementitious Materials and Alternative Binders for Sustainable Concrete, 2017, Montreal, Kanada
Publisher:RILEM
Document Type:Conference Proceeding
Language:English
Year of publication:2017
Tag:aggregate reactivity; alkali silica reaction; dissolution of silica and alumina; dissolution rate; modeling; open porosity
Number of pages:14
Faculty/Chair:Fakultät 6 Architektur, Bauingenieurwesen und Stadtplanung / FG Baustoffe und Bauchemie
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