RILEM TC 203-RHM: Repair mortars for historic masonry. Performance requirements for renders and plasters

This article given a summary of functional and performance for renders and plasters for historic masonry (design, execution and maintenance). Specific attentio has been paid to degradation effects, such as caused by salt crystallization and freeze-thaw cycling. Traditional as well as designed prefab mortars are considered for repair intervention

RILEM TC 203-RHM Repair mortars for historic masonry:The role of mortar in masonry: an introduction to requirements for the design of repair mortars

Mortar has been in use for many thousands of years and is integral to most masonry construction. Is use is widespread in every culture where masonry is constructed. It is present in the majority of the global built cultural heritage, and is therefore a major consideration in building conservation. The effettive design of a motar for repairing masonry depends on a clear understanding of its function. The main functional uses of mortars in masonry are classified as bedding, ointing, grout, render, plaster, flooring and mortars for surface repair. The requirements that each type of mortar must meet in service depend on its environmental exposure and its role in the masonry element that it is found within (e.g. issue such as historic authenticity, aesthetics, resistance to moisture ingress, structural integrity, and service life). Technical requirement such as adhesion, strength, elasticity, water and vapour transmittance, drying behaviour, thermal dilatation, ability to deal with salt contamination and freeze-thaw cycling, and its aesthetic properties can be quantified. Mortars properties can be adjusted by varying ingrdients and their proportions, to meet the deffering technical requirements

RILEM TC 203-RHM: Repair mortars for historic masonry. Requirement for repointing mortars for historic masonry

This paper gives a summary of funcional and performance requirements for repointing mortars for historicf masonty (design, execution and maintenance). Successful performance of repair and conservation of mortars in historic masonry requires more care with design and execution than whith modern masonry

Performance and Repair for Repointing Mortars,

A brief overview is given of performance requirements for repointing mortars for historic masonry. This paper highlights aspects of the chapter on performance requirements for repointing mortars to be included in the forthcoming RILEM TC 203-RHM guide on repair mortars for historic masonry. Existing information on repointing is also available. Repointing is the (processof) filling of the outer part of an existing masonry mortars joint with a new mortar that may differ in composition from the exising bedding mortar