Quantification of anhydrous GGBFS particles in cement pastes subjected to organic acids: Comparison of selective dissolution and image analysis methods

Author(s): J. Duchesne, O. Oueslati
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 43 – 44
Total Pages: 2
Language: English

Abstract: 
Concrete for agricultural construction is often subject to aggressive environmental conditions. The alteration is translated to a decalcification, an increase of the porosity and a progressive dissolution of phases. Previous studies have shown that the use of Ground Granulated Blast Furnace Slag (GGBFS) largely improve the chemical resistance of the binder. Anhydrous GGBFS particles seem particularly resistant to the acid solution. The purpose of this study is to quantify anhydrous GGBFS particles in blended cement pastes as a function of acid exposition time in order to evaluate their acid resistance. The quantification of the anhydrous particles was measured by selective dissolution and by Back-Scattered Electron (BSE) images analysis. After 28 days of hydration, 60% of OPC and 44% of GGBFS particles were hydrated. The amount of anhydrous particles drops for both materials during acid immersion. After 2 months of acid immersion, the amount of anhydrous particles drops by 49 and 23% for OPC and GGBFS, respectively. This study confirms that GGBFS anhydrous particles present higher acid resistance than OPC.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00