Use of ultrafine mafic rocks for the enhancement of carbonation reaction in lime renders

Author(s): Loucas Kyriakou, Ioannis Rigopoulos, Ioannis Ioannou
Paper category: Proceedings
Book title: Proceedings of the 5th Historic Mortars Conference
Editor(s): José Ignacio Álvarez, José María Fernández, Íńigo Navarro, Adrián Durán, Rafael Sirera
ISBN: 978-2-35158-221-3
e-ISBN: 978-2-35158-222-0
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 1099-1111
Total Pages: 13
Language : English

Abstract: Lime renders have been used as building materials since the earliest periods of antiquity. These composites set and harden through carbonation; the latter is a rather slow chemical reaction between calcium hydroxide and atmospheric carbon dioxide (CO2) to form calcium carbonate. In view of the slow rate of carbonation, which is considered a major drawback for the use of lime renders in vernacular and contemporary architecture today, several studies in the literature focus on the mechanism and kinetics of the aforementioned setting/hardening reaction, as well as on the factors affecting its rate. The present study focuses on lime-based renders that have been modified through the addition of ball-milled olivine basalt and dolerite quarry waste material. Both ultrafine rock additives were added to the mixtures at a percentage of 15% (w/w in partial replacement to the lime binder). Thermogravimetric (DTA/TG) and XRD analyses, as well as the phenolphthalein test, demonstrated an increase in the carbonation rate of the lime renders containing the aforementioned additives. The nano-modified end-products could potentially be used not only in restoration projects, but also in contemporary architecture.

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