by jbs030310 c3 — March 5, 2010—A newly approved ASTM International standard is intended to advance the cause of architectural preservation. The standard, ASTM C1713, Specification for Mortars for the Repair of Historic Masonry, was developed by Subcommittee C12.03 on Specifications for Mortars, which intends to continue to refine the standard with input from stakeholders.
Since most historic buildings pre-date the use of modern cement and lime formulations listed in the currently used ASTM C270, Specification for Mortar for Unit Masonry (1951), preservationists and maintainers have developed a body of knowledge regarding the use of appropriate materials and techniques for preserving these historic structures, based upon lessons learned thus far.
Among the lessons learned and incorporated into ASTM C1713 is that new restoration materials must be visually, chemically and physically compatible with the original materials being worked on, as well as suitable for the application, climate and performance requirements of the installation.
ASTM C1713 will allow specifiers to select mortars based on scientific principles and testing methods in order to satisfy project-specific requirements and goals, says the organization. The standard also provides accompanying limitations and guidelines for the use of material combinations that are outside the realm of ASTM C270.
