The impact of elevated temperatures on the properties of lime- based mortars

Author(s): Vasiliki Pachta, Sofia Triantafyllaki, Maria Stefanidou
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: 1156-1165
Total Pages: 10
Language : English

Abstract: Although exposure to fire and elevated temperatures seems to be a significant decay factor of structures and building materials, the impact of elevated temperatures at the properties of traditional mortars used in historic structures has not been yet adequately studied. In the present study, two series of mortar mixtures based on lime-pozzolan and lime-pozzolan- brick dust were manufactured and tested. In the first series the aggregates were natural, of siliceous origin (gradation 0-8mm), while in the second one 40% of the natural aggregates were substituted by crushed brick of the same gradation. At the age of 28 and 90 days, two specimens of each mortar composition were subjected to elevated temperatures (200o C, 400o C, 600o C, 800o C and 1000o C), under a specific heating procedure. Subsequently, their physical (volume change, ap. specific gravity, porosity) and mechanical (dynamic modulus of elasticity, flexural, compressive strength) properties were recorded. According to the results, lime-based mortars presented high performance until 800o C, while at 1000o C they still maintained their volume stability. The presence of brick dust and crushed brick in their matrix significantly enhanced their resistance.

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