Hydration of MgO in the presence of hydromagnesite

Author(s): Frank Winnefeld, Eugenia Epifania, Fabio Montagnaro and Ellis M. Gartner
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS2019) New Generation of Construction Materials
Editor(s): Marijana Serdar, Nina Štirmer, John Provis
ISBN: 978-2-35158-217-6,
Vol 1. ISBN: 978-2-35158-223-7
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 387-394
Total Pages: 8
Language : English

Abstract: The hydration of reactive periclase (MgO) in the presence of hydromagnesite (Mg5(CO3)4(OH)2·4H2O) was investigated by a variety of physical and chemical techniques. This system is of potential interest as low CO2 binder, if the magnesium carbonate is produced by carbonation from naturally occurring magnesium silicates such as olivine or serpentine.
In contrary to thermodynamic prediction not artinite (Mg2(CO3)(OH)2·3H2O), but a very poorly-crystalline form of brucite (Mg(OH)2), and an unknown amorphous hydrate which partially loses its crystal water at about 100°C were the main hydration products. Mortars based on such a binder show a reasonable compressive strength of 21 MPa after 28 days of hydration, which could be further optimized.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00