Investigations of soluble salt contents in modern hydraulic lime mortars - Test method and first results

Title: Investigations of soluble salt contents in modern hydraulic lime mortars - Test method and first results
Author(s): K. Kraus, K. Droll
Paper category : conference
Book title: Workshop Repair Mortars for Historic Masonry
Editor(s): C. Groot
Print-ISBN: None
e-ISBN: 978-2-35158-083-7
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 207 - 213
Total Pages: 7
Nb references: 13
Language: English

Abstract: There is no nationally or internationally introduced, standardized method for the determination of water-soluble salts in restoration mortars. In this contribution investigations about the influence of sample preparation and carbonation on the eluated salts are described by the example of lime trass cement mortars. It is demonstrated, that the eluated salt content is not a constant material property only dependent on the mortar composition, but changes with the age of the mortars and with carbonation and hydration of the hydraulic components. This makes the standardization of a test method difficult. Therefore, a standard method should confine itself to essential ions and well defined basic conditions (mortar preparation, storage time). In this contribution a test method is suggested determining the soluble alkali ion concentrations of 28-day-old mortar samples.

Online publication: 2009-06-08
Publication type : full_text
Public price (Euros): 0.00