Pozzolanic Reactions of Common Natural Zeolites with Lime and Parameters Affecting Their Reactivity
Cement and Concrete Research 39 (2009) 233–240 Contents lists available at ScienceDirect Cement and Concrete Research journal homepage: http://ees.elsevier.com/CEMCON/default.asp Pozzolanic reactions of common natural zeolites with lime and parameters affecting their reactivity G. Mertens a,⁎, R. Snellings a, K. Van Balen b, B. Bicer-Simsir c, P. Verlooy d, J. Elsen a a Dept. Earth and Environmental Sciences, KULeuven, Celestijnenlaan 200E, 3001 Heverlee, Belgium b Dept. Civil Engineering, KULeuven, Kasteelpark Arenberg 40—bus 2448, 3001 Heverlee, Belgium c Getty Conservation Institute, 1200 Getty Center Drive, Suite 700, Los Angeles, CA 90049, USA d Dept. Agronomy, KULeuven, Centr. vr. Oppervlaktechemie & Katalyse, Kasteelpark Arenberg 23—bus 2461, 3001 Heverlee, Belgium article info abstract Article history: The pozzolanic reaction between portlandite and different types of nearly pure natural zeolites was studied. Received 11 August 2008 Analcime, phillipsite, chabazite, erionite, mordenite and clinoptilolite-rich tuffs were mixed with portlandite Accepted 28 November 2008 and water (1:1:2 by weight), and the progress of the pozzolanic reaction was quantitatively determined by thermogravimetrical analyses from 3 to 180 days. Keywords: A thorough characterization of the raw materials was performed by quantitative XRD, XRF, SEM-EDX, BET Kinetics specific surface area measurements, grain-size analyses, FTIR and Cation Exchange Capacity measurements. Characterization The difference in reactivity of the samples containing zeolites with varying Si/Al ratios, as well as between Ca(OH)2 Pozzolan clinoptilolite-rich samples exchanged with different cations or ground to different grain sizes was assessed. Zeolites The results indicate that the external surface area only influences the short-term reactivity, whereas the cation content has an effect on both the long- and short-term reactivity.
[Show full text]