Examination of the hydration of cementitious binders with fly ash and blast furnace slag using in-situ XRD

Author(s): A. Vollpracht, W. Brameshuber
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: 272- 273
Total Pages: 2
Language: English

Abstract: 
XRD is used to identify crystalline phases based on their characteristic diffraction pattern that result from the specific crystal structures of the minerals. Quantification is possible using the Rietveld method. Portland cement consists almost completely of crystalline phases whereas fly ash and blast furnace slag contain large amounts of amorphous phases. These phases can be quantified using an internal standard, e. g. quartz powder. In this research work the hydration of ordinary Portland cement, Portland cement plus fly ash and Portland cement plus ground granulated blast furnace were examined using a polyimid foil to prevent evaporation of water and carbonation. During the first 24 h diffraction patterns were recorded automatically. For later ages single measurements were performed on the same sample. The formation of the crystalline phases ettringite and portlandite and the reaction rate of the clinker phases during the fist 28 days of hydration are compared. Thermogravimetric analysis and pore water analysis are used to check the results.

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