Improvements to Water, Salt-Scaling and Freeze-Thaw Resistances Of Historic Mortar Replication Mixes

Author(s): Michael P. Edison, Chad Lausberg
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: 1125-1141
Total Pages: 17
Language : English

Abstract: While the long-term destructive potential of liquid water in masonry assemblies is well known, the potential for disruption of saturated mortars exposed to freezing conditions can represent a more challenging and immediate problem. Highly porous and permeable mortars, valued in historic preservation work, also have the potential to become rapidly saturated. In horizontal traffic surfaces such as pavements and stairways, damages related to water ponding and saturation prior to freezing may be further exacerbated by the presence of de-icing salts whose crystallization may cause exfoliation, delamination and disruption of substrates.
Testing was undertaken to evaluate mortar admixtures in various historic mortar replication mixes incorporating Natural Cement, Natural Hydraulic Lime 3.5, Roman Cement and Portland Cement-Lime binders. Testing was based on a modified ASTM C672/C672M-12: Standard Test Method for Scaling Resistance of Concrete Surfaces Exposed to Deicing Chemicals. The most effective treatment for improving freeze-thaw, water and salt-scaling resistances while maintaining high moisture vapour permeability was a proprietary cationic acrylic latex admixture at 75% concentration.

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